DE1479434A1 - Plastic liner for container - Google Patents

Description

Plastic lining for containers.

The Brfinduag covers containers lined with plastics, such as, for example, paper plates, drinking cups and the like, and in @@ esondere The invention on Maßn @ hmen to Mer @@@@ une connect the lining material with the body of the Behiltet.

When packing hot and cold dishes at home or at home, such as beber cheese, fruit salad, meat, Soups, coffee and in vox edible objects, such as oils, fats, solvents, acids, bases and other, it is desirable that the containers for dis goods from common usage inexpensive materials, such as paper or other fiber materials, or plastics manufactured and theae Bohdlter. ft r'2}} rett etiktl. @ .B. in the For the production of Diuner or Party Tollers, the containers are made by pressing or when making deep containers or drinking bowls, they become the same produced, a fold is made in the base body and this with a dotez base glued w @@@. The materials used for the base body are not always ven nature for the substance to be filled into the container and to be preserved in it impermeable and can be chemically attacked by this substance. aside from that The materials can all be relatively porous, so that food and other absorb substances or allow these substances to seep through Next the materials may contain small percentages of chemicals that as Bindemittal or the like find use and in the in the container containing substance, especially when it comes to food are so that an adverse effect on the Given container contents is. After all, deep-drawn containers, regardless of whether the container material ideally impermeable or otherwise suitable for use as a container, be @@@ ächtlicbe Difficulties in connecting the pallets or unfolded hems with the floor connections result so that these containers do not run down. @ It has accordingly become the recognition enforced that only a completely inner plastic liner, i.e. ho the has no seams, false and the like, and has an interruption at the top but the bottom and the Extending walls including the bottom joint and the side seam of a container, leads to an impermeable and tight container. In the case of pressed paper plates it is desirable that these be made of a relatively tough or hard material, for example Made of plastic, coated or lined to give the structure and hardness to improve the used surface and to reduce the susceptibility to moisture or fats from food being destroyed during use, see below So far, such lining materials or lining materials have been reduced not economically applied.

Other shortcomings were that either was not a satisfactory one surface or no fixed bond between the basic body of the container and the The lining or lining has been achieved so that the lining is often calibrated loosened during use. Hot spray or dip for a complete There are several reasons for putting plastic cover inside the container unusable and it is therefore desirable that the liner be in the form of a Foil is applied. There are preformed foil linings for this The purpose is known, but these require additional manufacturing and treatment work do the placing or placing of the liners in the containers. Often times have this Films not of uniform thickness in the as-molded state, do not always fit properly into the container and in any case leaves the bond between the foils and the base bodies the container left a lot to be desired. Also are the measures that are used were to use foil-like plastic linings of the kind mentioned, either costly or not easy to control.

The device often sticks. that brings in the linings the same or causes tearing of the lining material either bai the Manufacture of the lining or when the lining is introduced into the container.

It is sometimes desirable to sines the inner surface or the top edge Bebälters, for example, decorate an aplat lera in an attractive and colorful way, zo that the appearance of the plate used for parties, picnics and the like, is lifted. Although paper all were colored using printing inks, the color, however, grows thin or soothes tindrualk, B it either lofts or while the plate is in use, so that the decorative cleaning des lares is not obuc drawbacks as the user believes that the dine on the plate to be contaminated by the Farbbs, whether or not this is the pull lot or nioht.

The invention provides an improved, plastic-lined Container that does not have the disadvantages listed above. The container dead economically to be produced in large quantities. When it is made, the lined one can or lined paper containers hold boiling water and place in an oven temperatures up to approx. 120 ° C (250 ° F) for a certain period of time are introduced, without the risk of the container dissolving or being lost.

GandO of the invention is an outerwear made of a first plastic film, which is preferably transparent fat, and in any case a relatively high softening temperature connected to a container by means of a second plastic film. preferably becomes an attractive printed decoration between the two plastic rolls brought in, the material from which the second plastic bolie is made has a Softening temperature that is lower than the softening temperature of the material from which the first plastic film is made. In this way the second serves Plastic material as a heat-sensitive binding agent around the Kunetatottf outer clothing, The both the desired shape and the sufficiently smooth plumb bob as well as the other desired properties to be connected to the base body of the container.

Preferably, according to the invention, all material is used for the rate Polypropylene was used for outer clothing and polyethylene was used as the material for the binding layer. The two materials are preferably layered together to form a single sheet.

The plastic layer or the plastic film is preformed with the Container orundum using of rme and veines print medium connected using a piston or similar mechanism Equipment that acts directly on the plastic, and su uneven tensions, to cracks or to a gluing with the lining wUhrnO don Verpressons inside of the container is avoided. The method and apparatus according to of this invention are therefore particular to the manufacture of deep-drawn containers suitable.

With the polygthylon overxogenic side facing down, a film is made from the polypropylene-polyethylene layer placed on the container edge and firmly glued to this, as well as at the same time according to the size and porn des Punched out container edge. These procedural steps are performed either before or in the essentially on the same side as the stretching and bonding of the film with the inner surface of the container. Before the sticky sheet or sticky film is stretched is, the polie and the container body to a temperature above the Softening point of polyethylene, but below the softening point of polyprope rhtt.

The polyethylene becomes sticky or smeared in this way and the The extensibility or stretchability of the polypropylene is improved in this way. The slide will then don odor debuts Bruelc of a media eye ; The film dries and presses into the inside of the container so that the container is entirely lined with polie.

If the lining is adapted to a deep-drawn container or the like and must be connected to this, it is first partially stretched upwards , bie to a height that is less than the "draw height" of the container and as before will be carried out, then heated further. that of the preferred embodiment According to the invention, the final configuration is that of the curved and on diode Way pre-stretched and pre-heated film the fora of a hood with a flat Middle high and sioh naa'h below and outward slopingon side walls, which are essentially inclined by 70 ° to the horizontal and into the flat upper part in Pass over the shape of a gently curved section ¢ The film is stretched during the pre-stretching so stretched and heated that there is a difference in layer thickness in the side wall zone of about 0.038 mm (0.0015 inches) of film immediately adjacent to the edge of the container to to about the thickness (e.g. 0, 10 mm (0.004 inches)) of the original foil, when the entire side plate is at the above-mentioned angle of repose of 70 ° in the pre-stretched position Hood configuration is present, with the middle zone of the layer as a whole in essential diva original and uniform in strength. Simultaneous warming takes place so that finally the entire pre-stretched wall area of the folio on substantially the same temperature as the softening temperature of polyethylene and the substantially unaffected central portion of the film on a substantially unaffected basis uniform temperature slightly below the expansion temperatures of polyethylene heated int.

To determine the thickness difference in the wall zone or the wall part, such as or last in the extended hood. if it is to be reached, the heating takes place to the final temperature in the wall area gradually and gradually during the process Pre-stretching, although this pre-stretching and all of the heating within one Icursen time span is carried out. That is, the heating of the side wall part first found in a ring area immediately ambon the edge of the container and ouletat in the ring area next to the flat central zone of the layer. The naoh and the heated ring areas of the side walls are further heated by the heat source, if this acts on the following ring areas.

Although ni-obit genzu could be determined, it is assumed, however. that the different strengths of the polie appear in the following way: If the film is pulled up, the heat source acts on the guess ring area first and gives it a greater elasticity, before the ones after @@ Ring areas are heated to the same extent as the tensile strength of the film as a result, in this first ring area in comparison to the rest of the layer, so that the polio is immediately atreoct and thinner in this area before daa stretching and the assumption of strength in the ring areas, the splitter heated will be done.

Therefore and perhaps above because of the somewhat longer time span, during which the first heated rig areas are exposed to the influence of the heat source boiled, these become stronger than those ring areas which are shorter of the heat source are exposed, stretched.

The foil is then placed underneath in the fully heated container pressed in. This is done with a printing medium. that at the preferred Ausfüht tiontorm according to the invention in combination a vacuum and a Generated air pressure.

In the case of a deep-drawn container, the foil is pressed on the bottom has least expanded and weakened in the stretched wall or edge area, and progressively towards the middle of the layer towards in inverse proportion to the different stretching and Weakening within the edge area, which was described above. There is considerable stretching and weakening Statute in the Central Office of the Polie.

In the result. The Polie then asked for a uniform strength of about 0.038 mm (0.0015 inches) when in its final position and with the container body connected is.

It is emphasized that the binding material made of polyethylene, if it has not melted completely within the edge zone, is very sticky and at least at a diapo tack temperature in the central zone the Polie is at the time when it is started to press it into the container, however, that the heated container turned all * polyethylene surfaces into a very sticky one or molten state when they come into contact with it.

While the print medium is still printing on the hot film or the beige foil in place and 8telle exerts, the container and the now complete fitted inner liner cooled. As a precaution, the cooling medium air that is assisted by quenching with cold water, then in the container up to about 6.3 mm (1/4 inch) high is poured into the container.

After Khlen the polyethylene fastens the polypropylene liner on the container.

The process of making linings for and joining this with containers according to the invention is expediently with a device carried out, which is described below. The he-S according to film stretching and -Connecting device wetot appropriately heated and matching top and bottom lower dies, of which the lower eo is shaped to receive the container and the upper one has an inverted hood configuration. With the preferred Embodiments of the invention have both die cavity openings to form a To create vacuum or air pressure inside the cavity * If deep-drawn Containers are lined, the upper Geeenkhohlraum has a special inverted dome configuration. In the preferred embodiment, the Cavity height of the hood about 3/5 of the drawing depth of the container and the ring-shaped inner 8eitenus of the hood is at an angle of 70 ° to the horizontal inclined inwards. The inclined wall goes in a radius of 12.7 mm (t / 2 inch) in the flattened in the middle arranged upper part of the hood tuber. Of the The entire upper die cavity is heated, but the central area is flat partially isolated, to locate an area where the Polyethylene is heated to a temperature below the softening temperature, whereas the rest of the toilet inside the die cavity is at one temperature is kept above the softening temperature of the polyethylene.

The lower edge of the upper die cavity is shaped to be the layer or the film presses against the usual bead of the container and adapts to this when the upper die cavity is tied to the lower die cavity test while the lining is being stretched and then lining the Container takes place.

The invention is explained by way of example with the aid of the figures.

FIG. 1 shows a perspective view of a fully lined one deep container according to this invention, shown from the Toile in the cutout are.

. FIG. 2 shows a section along the line 2-2 in FIG 3 shows an enlarged partial section through the container shown in FIG along line 3-3, ligur 4 shows an even enlarged partial section l of line 4-4 in Fiur 3.

FIG. 5 shows a very enlarged cross section, in which only the plastic lining of the container shown in Figure 1 is shown in section.

Figure 6 shows in a schematic elevation and partially in section the film punching and gluing device required for the first main step of attaching an Ausk on a container according to this invention can be used.

FIG. 6A shows, in an enlarged partial section, part of the FIG Mgur 6 dargestollten device to illustrate its operation su.

Plgur 7 shows the upper and lower die cavity in a longitudinal section a device according to the invention, which is used for attaching a lining in one-tisfen Container according to this invention can be used.

This sectional view illustrates the second and third Process step of the mode of operation according to the invention.

FIG. 7A is a partial top plan view of the ejector plate of FIG 7 shown device.

Piger 7B shows in an enlarged partial section a corner part of the upper die cavity of the device shown in Figure 7, while simultaneously the SuotanO don lining material at the end of the third process step of the Operations according to the invention is verified.

Figue 8 shows the device shown in liguer 7 again In Section, with the fourth process opening illustrating the working white according to the invention is. liguer 9 shows one of the device shown in FIG fifth major senior committee of the operation, bet that the upper and the lower Die cavity are separated from each other. Only the lower die cavity is in the section shown in Figure 9 below Schen, liguer 10 shows the lower die cavity the device shown in Figure 7 in the child during the fully dressed Container is ejected from the die cavity.

Piger 11 shows a schematic view of the process step, around an ornate, plastic-lined paper dinner plate after this one Invention to manufacture.

Figure 12 shows schematically in perspective a device, which are used to carry out the method steps shown in FIG can to apply the liner to the base plate body. figue 13 shows a slightly larger perspective view of the finished plate.

FIG. 14 shows an enlarged partial section along ligament 1414 in Figure 13.

FIG. 15 shows an enlarged vertical section along the Linge Figure 12, illustrating the process step in which the film is placed on the open end of the plate body.

FIG. 16 t is a vertical section similar to that in FIG. 15, the Process step is illustrated in which the film with the cherflüche of the fibrous Plate base using a pressure medium is connected and FIG. 17 shows a partial section in which the cutting off of the illustrates excess material from the rim of the plate or platter will.

In Figure 1 is a deep-drawn container 20 with an inventive Lining shown. The container has a base body 21 made of stiff paper Or the like. Lined with a plastic film or a plastic film 22 is. In the preferred embodiment of the invention, the lining is 22 a layer 23 which, as shown in FIG. 5, also comprises a polypropylene layer 23a, which serves as a main lining material, and consists of a polyethylene layer 23b, which is bonded to the polypropylene layer 23a in any known manner and which itself serves, the polypropylene layer with the base body 21 of the container, as will be described below.

The base body 21 is a container with a capacity of 340 g (12-oz) with a conical paper cylinder 24 and a paper base 25. The container but can also different shapes, or sizes, and of other things Material. At its upper open end 21a, the container 21 has a bulbous shape Ring edge 26, which is shaped in the usual way by the upper edge of the part 24 turned outwards. At the lower end 21b int the main body of the container part 24 wrapped inwards and ru at the top to form a bottom collar 27, the together with the end 21b, a downwardly folded edge skirt 25a of the floor 25 surrounds to hold the ground in a known manner. The flange or the apron 25a of the bottom is, as shown in Figure 4, along the outer edge surface with connected to the inside of part 24 feat. The fastening is done by at a distance spaced dots of adhesive 28, such as. B. from a glue or paste. This connection '. is known as a "skip seal" between two parts. The others Boundaries between the weft 25a of the bottom and the collar 27 is not through Adhesive connected.

The collar is only turned up and during manufacture of the container pressed against the skirt 25a of the bottom. As detailed below it is desirable to have the plastic liner 22 on the inside of the container base body 21 by applying a vacuum through the closed Bottom of the container is applied through. The broken seal, the caused by the adhesive films 28 and also the lack of an adhesive connection Carrying 27 between the section 25a of the floor and the upwardly folded position is made easier the vacuum line through the bottom of the tank body, this is particularly important if the bottom 25 is made of airtight material, such as plastic is, although in the preferred embodiment the bottom 25 is made of paper, which is somewhat permeable to air and therefore facilitates the transfer of the vacuum.

As shown in Figure 2, the container body 24 is made of the Convolutions of an eB & pieret tire in the usual way that a two-layer Basic body conetration is formed by the two layers with the reference symbols 24a and 24b. The base body 24 has an overlapping and with Adhesive affixed longitudinal seam, denoted by the designation 29 in FIG will. In order to obtain such an overlapping 8aula su, it is true that there is a single turn of paper auareichtend, in a construction with two turns, as shown in FIG is, however, there is an inner seam 29next to each other overlaps itself to merge into the outer layer 24b and an outer one Hem 29b the point at which the outermost layer of sight 24b overlaps itself at its end. The inner and outer winding layers 24a and 24b can be bonded together with adhesive, for example by the entire surfaces are glued in the usual way, so that the tree 29 in similar merise is attached by glue.

The container body with a capacity of 340 g let a relative deep body. The total height is 3 inches and the recess under the floor 25 let about 12aT 7 mm measured from the lower edge 21b high, so that the usable height of the container is 6.33 cm. The container diameter on his The mouth 26 is 11.43 cm (4-1 / 4 inches) and the body 24 is tapered inward inside and down to a diameter of about 8, 89 cm (3-1 / 2 winches) on his lower margin 21be However, h is emphasized that containers with larger capacities, that are deeper and wider can also be used.

The material used for the container liner 22 is made made of two different fabrics. The erate fabric serves as the main lining material and it consists of a plastic film or a plastic Movie, which is strong and stretchable in higher tempertures. The second fabric is used for sle heat-sensitive binding material with a softening tampa @ ature which is considerable the softening temperature doa acoten gauze fabric and of course below that The softening temperature of any plastic material from which the container body is made possibly exists. As shown in Figure 5, the first or main lining material is a film or layer of molded polypropylene 23a having a purpose in the range of 135 to 16000 (275 to 320 ° F). The heat-sensitive binding material iut a layer 23b of a polyethylene of medium density, which in e @ truded form is applied to and bonded to one side of the polypropylene film. The polypropylene film was pretreated using a corona charge, to ensure a firm bond. A special polyethylene film has one Extension temperature r from about 104 to 110 ° C (220-230 ° F).

The zwelschichten-folienmaterla @ is indicated with the reference si-Chan 23.

The thicknesses of the layers 23a and 23b are according to the desired Emd strength of the lining 22 and the HM of the drying and weakening of the material chosen, which this material according to the height and the diameter of container base body on which the material is applied, are subjected Note that the main lining material is polypropylene has been found to have a uniform final thickness of 0.038mm (0.0015inches) of clothing 22 in the mei. in most cases is desirable. Accordingly has in the lining material 23, the polypropylene layer 23a has an initial strength 0.05 mm (0.002 inches). Furthermore, taking into account the weakening of the binding material, as aio is done when applying the lining, and taking into account the required Plonge the material, and a good bond between the poly (propylene) film 23a and the To obtain paper from which the container base body 21 is made inty an initial thickness of the polyethylene layer 23h of 0.050 mm (0.002 inches) is required. The whole The initial thickness of the layered material 23 is therefore 0.10 mm (0.004 inches).

After the heated foil 23 made of the same materials has been heated the Polyäthylenaohioht e very sticky or even melts, while the polypropylene layer remains in frater Pori. Temperatures above the softening point of polyethylene, however, below the softening point of the polypropylene, the polypropylene layer becomes very stretchable or @extensible. It is highlighted. that also aniere Plastic layers with different synthetic stiffeners can be used, the vGrachick- ". edeno softening pumps have, even less, the different softening pumps habsn, s @ long the plastic, which forms the main lining material, has a higher level Has softening point than the other and is heat stretchable, In addition, this one must be used Kunststeff have the properties desired for the lining.

The following is a description of how the mg 22 plastic lining is formed and is pre-tied with dom container body 2 @. It will first look at the figures 6 and Sh bazug geno @@ en. In FIG. 6 there is a washer from the Ausloidungsmeverial 23 shown. which are excluded from a continuous stroke and with the Edge bead 26 of the container base body was pre-glued, with a film punching and adhesive device 30 is used.

The container is held by a holder 31 which is on a conveyor or a turntable 33 is attached.

As shown in FIG. asked the container at its lower edge 21b the thickness of 5 layers of paper and therefore it may be desirable to use a Provide heating element 32 in holder 31 to preheat the lower part of the container, while the foil is punched and glued to ensure that the Bottom connection point inside the container is ultimately fully heated will. En kurde, however, found that such a preheating of the container l odens does not work is necessary in each case and therefore the heating element 32 can be omitted in these cases will. When the heating element 32 is used, the above ao is formed that et the Holder 31 for the container is carved to a temperature of about 120 ° 0 (250 ° F).

The device 30 weeps a vertically displaceable and heated Flask 34 on which is used to heat the edge of the Folioneaheibo ou and connect with the container base body 21 see below. Sine displaceable in the vertical direction Punch 35 and a vertically displaceable Umterlage 36 ein voren. The base 36 carries a round die ring 36a made of hardened steel, its Shape and size corresponds to the bead 26 of the container base body. With a suitable (Not shown) the parts 34, 35 and 36 are relative to each other as well as displaced relative to the Behälitergrundkdrper 21. this is done so that how shown in Figure GA. when punching out and gluing a disc from the disintegration material 23 on the container base body the folder 36 is moved down, us to bring the die ring 36a in the position shown, in which this the rand @@ st of the container, after which the punch 35, which has a krelsförmiges Knife 35a carries, is lowered down and through engagement with the die 36a a disk 22a of the sheet material which is in the form of a strip 23, that was fed before these processes. The heated @ piston 34 moves Then relative to the punch 35 and the terrage 36 downwards to the sheet of film 22a to guide through the ring 36a and this sheet of film in engagement with the edge bead Bring 26 of the container body 21 su.

As in the cross-sectional view on the left beige of the liguer 6A is shown, carries three pistons 34 * in Fileförder- and -Klebselement 38, which from Aluminum is made and on the underside of its edge a curved or curved one Has recess 30a, which adapts to the round Fora of the container rim bead 26 udn the Boheiba made of film material 22a in engagement with this edge bead. Daa Element 38 made of aluminum is heated by a heating element 39, which is a disk-shaped Electric heating element of the "calrod type" or the like. Can be. The Bichent made of aluminum is of niner sleeve @@ made of steitem material, such. B. from Micarta isellert. That Heating element 39 is held in place by a plug 4 which is attached to the piston shaft 3 @ a is screwed on. On the winter side of the plug 41 is one disk made of soft heat-insulating material 42, e.g. made of felt and attached It is emphasized that the insulating material 42 is sufficiently large, no that extends to the lower edge 38a of the lament 33, around the central surface Dor foil disk 22a against the heat emanating from the Blement 38, while to achireen of gluing. In addition, there are four equally spaced at the periphery oblique openings 43 arranged in front of one another, dle through the element 38 and the insulating probe material 40 surrounding it are guided in order to enable that compressed air between the piston and the film when they are in contact can come, escape. By a slight air-siphon-flow through the openings 43 in the downward movement of the piston 34, the film or the Film held almost against the bottom of the bean until it contacts the container edge have.

In the drawing showing the device 30 is for reasons for the sake of clarity, a distance between the piston element 38 and the round knife 35a of the punch 35 is shown. It is clear, however, that these two elements are immediate adjoin and slide on each other and the size of the die opening In the pad 36a im; essentially the same diameter as that Piston element 38 and the outer diameter of the edge bead 26 deo container base body Has.

In operation, the sheet 23 is fed by a film or sheet advance mechanism 42 in the direction of arrow "A" (Pigur 6) to a position above the through of the die 36a brought certain opening. The polie 23 was not heated at this point. As stated above, the polyethylene layer of the layer is at the bottom, there this polyethylene layer of the layer 23 as a binding material between the polypropylene layer and the paper from which the container body 21 is made is used.

In'eau the film 23 is arranged over the die 36a, the device 30 moved down, us bring the pad 36 in a position su in which they the edge bead 26 of the base body 21 surrounds. Simultaneously with this movement will be the punch 35 first moved faster and then slower down to daa Bring circular knife 35a into engagement with the upper surface of the die ring 36a su and to punch the disk 22a out of the film strip 23. At the same time with the downward movement of the base 36 moves the piston 34 with it a speed related to the speed of travel the Stanse 35 agreed iot, according to untCNt ao that the element 38, which heats the folic and sticky machi, with the foil disk 22a, immediately after this was autat, comes into engagement and this lbs after untaa flen the die ring 36a out into a Promotes position, ia of them with the bulge 26 of the container base body, such as is shown in Figure 6A, comes into engagement and is glued to this edge. The heating element 39 has the element 38 made of aluminum at the above temperature however, below the softening point of the polyethylene layer 23b of the sole 22a of the softening point of the polypropylene layer 23a of this layer, suppose that the softening point of the pelyethylane is about 104 ° C (220 ° F) and the minimum softening point of the polypropylene is about 135 ° C (275 ° @), as mentioned above, bol the preferred embodiment according to the invention, the piston element 38 on sine Temperature of about 120 ° C (2go ° w) heated. The mode of operation is chosen so that the piston valve or duo Xolbenelezent 36 with the piston washer 22a only about 2-1 / 2 Seconds in contact until the edge of the film with the edge bead 26 of the container is glued. It is pointed out that the fils of insulating material 42 den Mittelboreiah the. Pilma disk 22a against. the heat emanating from element 38 fail. The vocational direction 30 including the Bastand + utld 36 is then raised to its starting position and it can be featured that the Schoibe 22a is firmly affixed to the beaded edge of the container, the container base body 21 with the glued-on folio disk 22a then becomes an automatic conveyor (not shown) zn the device 44, which is shown in Figure 7, promoted.

The device 44 has a fixed or stationary lower one Hollow die 45 that accommodates the container and a hollow die that fits on top 46 to the lower gas joint, as can be seen in FIG. 9, in a vertical direction direction can be shifted to the direction su bubon su fob in Figure 7 is the device 44 in gas lockaner position 6ewei = In Bia they the container body and the folion slide 22a connected with it encloses, so the protrusion the pile and the subsequent lining of the container, as explained below will be, can be done. Before this mode of operation is explained, we @ the construction of sections 45 and 46 is illustrated in detail in the apparatus.

The lower hollow die 45 is, as shown in Figure 7, on cinam support 47 is fastened with a steel plate 48, gin Sohwank plane 49 is included arranged on the carrier 47 to operate a vartikal voruchiablichen Kolbeu 50, which is normally pressed into the lower position shown by a spring 51 will. The spring presses on the Abaatz 50a of the piston, which strikes against the plate 48. The toilet of the piston 50 untar diaaem paragraph 50a extends through an opening 4Ba of the plate and the portion of the piston above the shoulder 50a extends into a cylindrical opening 52a of a die sleeve 52 Me aluminum. l) iot Hülae 52 pugt lii, a hot chamber 53 and is test with this by screws, not shown tied together. The heating chamber is also made of aluminum and is in turn through not shown screws connected to the plate 48 feat. Between the hot chamber 53 and the plate 48 is a base plate 54 made of 8tahl and a heat insulator 55 arranged, with the lestez made of Marinite or a similar Matmrial. It will be highlighted. that the upper part of the tolbana 50 in the opening 52a of the Die sleeve ex Gleichoni underneath arranged opening 53a in the bottom of the shark chamber 53 is slidably arranged and that the upper end of the Fedor 51 to the Untorseito Jer Heiskamnor or Einriehtung 53 turns out to be. To adjust the spring 51 are Openings 5 @ a and 55a in the base plate 54 and the Iaolator, like dargostellt, provided. It is further emphasized that the interior is the die sleeve 52 conforms to the outer shape of the container 21 and has a ebentaJlu u at the bottom Annular groove 52b bai to receive the lower edge 21a of the container protruding towards unton. The cylindrical opening 52a is just above the underside of the Gesonkhülse 52 to the middle of the height of @ut 52b. The lower end of the Kolbwoa 50 is usually located immediately below the bottom of the groove 92b, as shown. Therefore will when the lever 49 is pivoted upward, the piston 50 is raised so that the upper customer enters @ut 52b and the lower edge 21a of the rehab @@ ch above drftokt. A detachment of the container from the groove is guaranteed if the finished container is to be ejected from the lower hollow die 45.

Mr the ejection of the finished container from the lower weeent 45 is the bottom of the sleeve 52 is recessed, as shown at 520, around an ejector plate 56 for the container to be picked up, which is blown with a 37tMt $ iMvertikalverwhiehbpeWeU <Meafflgewehtwbt lots which your side @uroh the lower part of the device, as shown, extends. The upper surface of the ejector plate 56 is inside out Adjustment running vacuum channels 56a (of che Figure 7A), the upper avite dar Flachkopfashreuben 57 usually lies in the ekene the arch part @ 52d of the necks 52. In this way As can be seen from FIG. 10, the ejection plate 56 becomes the finished container Lift out of the Unteron die 45 when the shaft 58 by suitable means (not shown) is shifted to chem.

As best shown in Figure 7B, is the lower edge of the sleeve 52 left out at 53e, and the underside of the container rim bead 26 is not to be trimmed. Outside of this upper edge, the die sleeve surface 521 is recessed, in order to enable a work cycle to be performed on the lower and then hollow die, @@ that firm contact between the dies or opber cavity 46 and the container rim bead is guaranteed.

The hot chamber 53 has a spiral channel 59 over it the entire height of the inner surface of the heater, which rests on the necks 52 angrenst. The lower end of the channel 59 is, with one extending laterally Oil inlet 59a connected, through the hot oil, the Ta at thaw temperature ven about 138 ° C (280 ° F) let # eingolsites, will be heated. The oil could be from a not shown Supply source and flows through the spiral channel 59 to heat the hot chamber 52. As shown in Figure 7, the inlet port 59m is also provided with an annular channel 60 connected to the underside of the die sleeve 52, zo that the bottom of the sleeve and the ejector 96 can be made of aluminum. An oil leak (not shown) is also available. The sleeve 56 and the ejector 56 can be made by other means heated above, such as by electrical heating elements. In any case the arrangement is made in such a way that the measured inner corrugated surfaces of the necks 52 admit the entire innerom @ end surfaces of the necks 52 including the bottom groove or bottom groove 52b of the flat bottom part 52d and the upper edge 52a as well as the Ejector plate 56 heated to a Tomporntur over about 120 ° C (250 ° @) and on this temperature can be maintained. The ejector plate and the lowest surfaces the pod will likely be at slightly higher temperatures. heated as desired become natural as a result of the upward flow of the heated oil the case temperature must be below 135 ° C (275 ° F), whichever is the minion's temperature Softening point of polypropylene corresponds.

.

As mentioned above, a vacuum is created during the lining of the container is applied through the lower die cavity 45 and for this purpose a vacuum line is used 61 in the Flatte 48 vorgesshen, This vacuum line is with a not shown connected vacuum pump. The anawrw end of the vacuum line 61 Mends in a Vaäunumkamer r the through appropriately wide and in flight with each other arranged central openings of the elements 48, 52, 53, 54 and 55, as shown, As can be seen from a comparison of FIGS. 7, 7A and 10, achieved the vacuum that is fotguéitet through the chamber 62 and the Loituns riz, the bottom the container 21 via vartical channels 56b which are angularly spaced from one another in the @nswerfer 56, the aich described above in radial direction in the d rs o »z (see figure 7A) connected and. Pas Vakunm is also about Channels 560 extending in radial direction in the underside of the ejector 56, which are amgeordmst under the upper channels 56a, so that they in Figure 7A will not be near the gas. There is also a round channel 56d in the Surface of the recess 96 provided, which the channels 56a and the channels 36b with one another connects. @m is predicted that a vacuum is directly on the underside of the container 21 over the channels 56a and 56d and over the circular distance (night beseichoet) Wipe the outer edge of the ejector 56 and the flat anterior file Die sleeve can be guided, what distance a vacuum channel forms into which the channels 56c open. In this respect it should be emphasized that that dms paper is made from dom of the clearing 25 of the container base body 21, sufficiently proous or air-permeable iot, usa a continuation of the vacuum through to enable this floor to pass through. m upper matrix or upper tset 46 has, As shown in Figure 7, a mounting plate 65 made of steel, for example with a thread 66 at the lower end of a veraohiebbaren in the vertical direction Shaft 67 is attached. The vertical displacement of the Molle 67 takes place (by not devices shown) to the device 44, as by a comparison of the Figures 7 and 9, for example, can be seen to open. The hood-shaped Die sleeve 68 is made of aluminum to ensure good heat conduction. The sleeve fits into a heating chamber 69, with which it is not shown Screws is connected. Dia from the heating chamber, which is also made of aluminum, is in turn connected to the mounting plate 65 with screws (not shown). A partition plate 70 on aluminum and an insulator 71 are between the un and the Mounting plate arranged. Of the leolator 71 is made of beard, iselieremerm material, such as Harinite and is ringformi @. trained, except that it forms a wall part of a @ be @ em bari and vacuum chamber 72, the upper wall the core 72 is supported by an annular recess 65a in the mounting plate 65 and the lower wall of an A @@ spaiung 70a in the separating plate 70, as in the figure 7 can be formed.

A compressed air connection 73 is in the fastening plate 65 Torgoaehen, to air to the upper @@ Kc @ mer 72 from a compressed air source (not shown) during to lead a very timely time of the proceedings. A vacuum connection 74 iat chen @ ell @ in de @ B @@@ stabilizing plate 65 and with an external vacuum pump (not shown) connected @ un a vacuum @@ in the upper chamber 72 on a besi @ at @@ @@@ at the point of the ancestral process to be seenJ Menn dit Val @@@ topt @ upe with the lower die raux 45 communicates, the compressed air and vacuum generator (not shown suitably controlled to generate compressed air and tumble according to requirements.

Between the Hid @ e 68 and the Dechel; the boiler room 69 lot an untoro Vak @@@@ uagleichsk @@@ rar @@ provided that the ton of Zuas @ arung 68 @ is formed. The two chambers 72 and 7 @ aind with @chreren in a vertical direction arranged Air and V @ kuumkanäle 76 connected, both through the helzkammer 69 as also through the partition plate 70, as shown, arst @@ eken. The channels 76 aind in Circles so arranged, sat in each halh @ uadranten three in rodiale @ abotand The X channels and the entire channels are located one behind the other in a row distribute the air and the vacuum @@ mehv or less evenly in the chamber 75 under @ h. Through 24 additional channels 77, the @iah arranged in icree-shaped rows through the @ the upper wall of the sleeve 68 extend, compressed air is from the lower chamber 75 or a vacuum continues into the Httlea 6S, according to the preferred embodiment described According to this invention, these Kandla 77 are drilled through small (Ho. 55) holes formed, dio e at an angular distance of 15 ° on a krais with a radius 1-1 / 2 inches (3.8 cm) so that they are on the edge of the flaohom center piece 68b of the lid of the Humas 68 as shown, arranged aind. In that context It is emphasized that a semi-insulating part 78 is secured at the top of the auba and the channels 77 pierce this semi-insulating part 78 as shown Or this insulating part 78 can have a durometer, ao dag the Channels 77 a of the ren periphery of this insulator open into the cavity, It will also highlighted that the radius daaCircles? i. '.' emd''Sh & l77na)? a '? jinöp & us . '. iae: 3fyC ~' sallyWa'3t? Y'G '? 4r :: r: ~' i.;: 3; = '1': ~ :: 1'1z -.! z: 'Pnrphxf Q. : 3 a : Y # c'f i. :? a: ~. 3:. ' ; :, ~ i i frs:: at münden.

The semi-insulating part 78 is a sheet of paper (with a thickness ven about 0.5 to 0.8 mm (0.020 to 0.030 inchas)) that goes with the flashing center section 68b of the hood is firmly connected, for example glued. The semi-insulating material can also be something other than paper, e.g. can be a thin layer of stiff Plastic or a thin layer of asbeetach can be used as the insulator 789 the die sleeve 68 with the flap-shaped inner surface has, in addition to its flat central part 68b a conical side wall 68c, dis, with respect to the horizontal, angled by 70 ° is. The lower edge (not provided with a reference mark) has an annular shape recessed part 68d which receives the round upper part of the edge bead 26, and a rin. 3t uSe extending down to the foil 22a. firmly against the Ranwulst 26 of the container to press and around the pre-stretching of the film, as below will be described to help.

The conical side and 68a is designed in the shape of a cone and goes into the upper middle part 68b in the form of a relatively wide arched throat 68f ü @ er. The radius of the throat is 12.7 cm in the coated version (1/2 inch). The inside of the hood of the gesture sleeve 68 is in the embodiment described equal to about 3/5 of the draw depth or draw height of the container (this is the height of the lower Gosenkhohlraums of the sleeve 52 between the upper edge 52e and the flat Bottom part 52d). A height of the hood in the upper hollow space of the shell 6st the same the holding of the draw height of the container is, can otherwise lead to success. Of the particular angles of inclination of the side wall 68e appear at least within the range of about 70 ° critical. That means neither a vertical sidewall nor a 45 ° opposite the horizontal inclined side wall leads to success. g, although I have a slope larger than 45 ° and smaller than 90 ° depending on the ratio of the durometer too drawing depth or drawing height and depending on perhaps other factors as well can lead to satisfactory results.

The cavity in the upper part 46 of the device is heated with Oil is heated to a temperature of 137 ° C (280 ° F) by a helical Channel 80 routed which extends over the entire height of the chamber 69 extends on the inner surface thereof, which adjoins the sleeve 68. The oil continues to flow through an apiral channel 81 in the upper surface of the chamber 69 which is connected to the Partition plate 70 adjoins. The oil that is directed to the two channels 80 and 81, is fed through the oil inlet 80a, as shown in FIG. 7 fat t. Naturally the inlet 80a is connected to a hot oil source (not shown) and an oil outlet (not shown) provided in the chamber 69 to allow the ola to circulate through to enable channels 80 and 81. Other facilities are highlighted can be used to heat the upper part 46 of the device au; for example electric heaters, a steam heater or the like.

In the upper and lower die cavities of the device 44 is Then the pre-stretching and the application of the film to the container are carried out. the Device is first set to temperature of about 120 ° C (250 ° F) on the inner surfaces both the upper sleeve 68 and the lower sleeve 52 are heated. The ejection plate 56 at the bottom of the lower die cavity 45 is also on the temperature in lower portion of portion 45 of the device heated, @ i.e. to about 120 ° C (250 ° F) or something long. The semi-insulator 78 in the upper part of the upper Die cavity forming the substantially flat upper part of this hood-shaped The cavity with which the polie will come into contact is set to a surface temperature heated by only about 93tC (200 ° F).

When the device 44 has been heated uniformly in this way is, the upper part 46 of the device is momentarily raised and the container body 21, on which the foil disk 22a is blot2 into the lower die cavity 45, as already mentioned, e introduced the upper die 46 is then lowered, to close the device over the container, as shown in Figure 7, SU. The container and the sheet of film remain in this closed state of the device a karzo time of about 2-1 / 2 seconds to. a preheating of the container base body 21 and especially a preheating of the lower part 25 with the five layer thick to effect lower edge 21b. Of course, during the preheating time, the plastic film is turned off 22a is also heated somewhat and it is assumed that aie is due to the expansion the air that is trapped in the container by the sheet of film, bulges slightly. As can be seen from Figure 7B, the Randwulat 26 and the outer edge of the film disk 22a from the hot edge recesses of the countries 52e and 68d of the upper and lower die sleeves included and the immediate adjoining ring area of the foil disk 22a is projected from the hot downward Bead portion 68e of the upper sleeve depressed and stretched somewhat. the polyethylene layer 23b on the underside of the film disk 22a becomes sticky and the polypropylene layer 23a becomes extensible to a high degree. Within the narrow ring area of the foil disks 22a in which these inner surfaces 68a and 68e of the upper sleeve wlibrand of preheating touched or close to these lichen, a certain stretching already takes place.

After this short time of 2-1 / 2 seconds, the foil disc will 22a extended. The polie is heated to the desired temperature through and through heated and in an upward direction by pulling the pile into the heated sheath 68 with the dome-shaped inner surface pre-stretched by applying a vacuum to the connection 74 is logged. The vacuum is drawn to the upper die cavity through the vertical ones Channels 77 of RUlse 68 are forwarded.

The vacuum is maintained for about 2-1 / 2 seconds at a pressure of 457 mm (18 inches) Hg (p. 5, 85 p. G. I.a.) maintained. The foil disk 22a becomes thereby stretched forward by aie against the side wall 68c, the curved transition part 68f and the semi-insulating part 78 within the holder 68, as shown in Figure 7B, applies, after which the edge zone of the Foil that rests against the side wall 68c, except for the temperature of the side wall, , i.e. up to about 120 ° C (250 ° F) and the central area of the foil disk, which is at the insulator 78 is applied, ultimately to the temperature of that insulator i.e. on heated to about 93 ° C (200 ° F). However, as already stated above, the slide gradually one after the other when in contact with the side wall 68e is brought, heated and stretched so that a difference in thickness of about 0.0513 mm (1-1 / 2 mils0 from the edge portion 68e of the pulse to the original one 0.1 mm (4 mils) thick in the central area of the poles below the insulating Part 78 is obtained.

Naceli the stretching out and rhitsen of the foil sheet 22a about 2-1 / 2 For seconds, the film is in a state that makes it easier to line the container, which takes place as the next procedural step in the device 44 in which in Figure 8 allows illustrated manner.

That lying on the vacuum line 74 of the upper part 46 of the device Vacuum is broken and essentially simultaneously with this the same vacuum is created (457 mm, (18 inches) Hg) to the lower die cavity 45 the vacuum line 61, the vacuum chamber 62 and the channels 56a to 56e in the ejector plate placed, after which the vorerhitste foil disk 22a down and to the inner surfaces of the container 21 is pulled up while stretching. Ho emphasizes that while the liner is pulled to the container, the foil disk on is stretched most strongly within its central area (which is only about 93 ° C (200 ° F), however, which is enough to cope with the greater forces that go into this Bereicti occurring to withstand) whereas the edge area of the film, which is on the higher temperature of 120 ° C (250 ° F) and already heated up to a darkening difference as described above, stretched forward, stretched to a lesser extent will. Of course, the strongest stretch will be in the very center of the polie located area and the slightest stretch occurs at the edge next to the Rim bead 26 of the container. The amount of stretch between these areas is different and in general this measure is inversely proportional to the strength, which was varied during the pre-stretch, so that the layer is ultimately everywhere is equally strong when she discards the container. The vacuum in the lower die cavity 45 is maintained for about 2-1 / 2 seconds @, however will vacuum was still maintained for the last half second of this period 2.5 atmospheres (35 psig) air pressure on line 73 of upper portion 46 of FIG Applied device. The air pressure is established through the upper chamber 72, which Channels 76, lower chamber 75 and channels 77 continue into the die cavity and presses the film 22a tightly against the inner surface of the container base body 21. It it is emphasized that although the container part 1 24 and the edge zone of the film on a Heated to a temperature of about 120 ° C (250 ° F) while lining the midsection the foil 22a which was preheated only to 93 ° C (200 ° F), but quickly to one Temperature of about 250 ° F is heated after being in contact with the container bottom 25 comes because this is heated to the temperature by the ejection plate 56 and the Boudent, 52d, which has been heated because the B b are in contact with the floor. The film is therefore in the middle part made extensible so that it is ensured that the polyethylene binding layer is sufficient becomes tacky to form a firm bond of the bottom of the container to the liner 22, which is fine uniform Thickness of about 0.938 mm in all areas was stretched In with respect to the vacuum in the lower die cavity 45e that passes through the bottom 25 of the Container base body 21 is passed, it is bervorgehoban that the paper from which the container bottom is made, is air-permeable. In addition, the "skipseal" described above, which are spaced apart by the Glue points 28 formed on the unbeaten parts 25a and 27 of the container and also the fact that dw is between the lower one turned upwards Collar 27 of the container and the folded-down chute 25a of the bottom No glue is applied that the vacuum is most effective through the floor joint of the container body 21 is passed on, so that the film tightly to the Verbimdungsstelle is used.

After the 2-1 / 2 announcements, the duration of the adjustment of the lining to the Inner wall of the container, but still while the vacuum is in the lower die cavity 45 is maintained, the connection 73 of the upper cavity 46 with the The compressed air source is interrupted and the device 44 is opened to dispense the polyethylene, which now connects the polypropylene liner to the container to cool and to solidify. FIG. 9 shows the device in this state. The lower die cavity 45 continues to be heated by the hot oil flowing in channel 59 However the liner 22 is exposed to air which brings this liner below the softening temperature of polyethylene especially in the EUhe of the beaded edge and the wall of the container cools down. However, in order to accelerate the cooling process especially in NEWe of the soil 25 su a water outlet 90 is pivoted over the now fully formed container 20 and cool waaaer in the container to a depth of about 6.3mm (1 / 4inch), as in FIG Figure 9 shown, filled. The water 91 cools the bottom of the container, the is the hottest part and ensures a feate bond of the liner 22 with it the container base body 21. Of course, the Wusser 91 should be purified water when the lined container 20 is to be used for taking food. It is clear that other substances than water can also be used for cooling.

After the container 20 is in this manner within the lower die cavity at about 2 to 5 seconds, the container 20 is placed in the in Ejected or ejected in the manner shown in Fig. 10. That means the water outlet 90 is pivoted away and an arm 93p which picks up the container is over the same emotional. The end of the arm 93 is in the form of a ring 94 with an inner annular surface 94a, into which the edge bead 26 dea container 20 fits tightly. The ring 94 has a conical surface 95t which extends outwards below the surface 94a expanded and the container 20 in the tight fit with the latter area leads. Of course, the ring is in the axial direction with the sleeve 52 of the lower part 45 of the device, as shown, in alignment.

The ejector shaft 58 is pushed up to the ejector plate 56 and the container located thereon from the sleeve 52, as shown, to lift out. The edge bead 26 of the deer container is then pressed into the annular surface 94a, so that the container is held by the ring. At the same time, the arm 49 is on the holder 47 rotated to lift the piston 50 against the pressure of the spring 51 ou so that the lower The end of the piston engages in the groove 52b and the lower edge 21b of the container raises so that the detachment of the latter from the die sleeve is guaranteed. When the container 20 has been picked up by the arm 93, the plate 56 and the piston 50 is pushed back down to its original position and the arm 93 is pivoted away from the lower part 45 of the device, so that this part again pick up another container base body 21 and the device 44 again eut a pre-stretching and film lining process, like or described above, can begin.

The cold water 91 is then extracted from the container by twisting the Armea 93 so that the container is turned over, removed. The container is now ready and when it is removed from arm 93 it is ready for use.

The plastic inner liner 22 is integral with the container mouth body 21 and is essentially the same across the entire area.

The lining extends over the side seam and the floor connection of the container. The strength of the clothing 22 can of course be increased, by using a sheet material of greater initial strength than described. The procedure and the device. They can also be used as described above in order to apply thinner linings than described and around non-circular HBehällyter to undress.

In addition, the method and apparatus can be used successfully for lining for conical containers that are open at the bottom, or for lining cylinders be used with open ends so that the part of the liner that is otherwise on Bottom of the container as described in the preferred embodiment, is liable is simply stretched over the bottom opening of this container or cylinder. In in this case, the lower part 52d of the lower die cavity 52 and the ejector plate become 56 at a temperature below the softening point of the plastic, for example the polyethylene layer 23b, which serves as a binder.

With regard to the temperatures when applying the lining and with regard to the temperatures of the different areas of the device is highlighted, that these temperatures for special purposes of the specified temperatures can differ. That is to say, the plastic lining materials can have different properties that affect the working temperatures impact. In addition, factors such as the desired working speed; the thickness, type, weight or moisture content of the paper or the Material used for the container body; the desired drawing depth the lining material and other factors the particular temperatures chosen or influence the selected initial thickness of the outer lining film.

A series of process steps is shown schematically in FIG to the Manufacture of a flat, ornate, plastic-lined plate with the Size of a dinner plate, which is denoted by the reference numeral 190 in Figure 3, shown. As will be described, the top surface of the plate is provided with a multicolored ornament 116, 118 adorned. In general, the process steps relate to 112 to 130 show the handling of the lining material and the process steps 138 and 140 the pretreatment of the container body 126 before the lining material is applied to this basic container body in method step 133. The steps 150, 160 and 162 represent the procedural measures to be taken after the application of the Lining will be done and it will be emphasized that all of these steps are carried out be performed sequentially in an order indicated by the arrows in Figure 11 is indicated.

When preparing the lining material, an endless strip of foil is used withdrawn from a roll of the material forming the main lining, which Step is indicated by the reference numeral 112.

Alternatively, step 112 can be a continuous extrusion process represent to produce a continuous sheet of plastic that is used for lining of the plate 190 is used. As generally with Fuigur 12, the endless film or strip has one corresponding width to the linings for two plate bodies that are next to each other arranged and to form. However, Ee can be a pile material with the width for only one lining or with the width for several ala two linings if necessary be used.

The material for the main plastic lining 110, that for the corresponding Embodiment according to the invention is used, is preferably a transparent one Polypropylene film about 0.013 to 0.13 mm (0.005 to about 0.005 inches), preferably about 0.05 mm (0.002 inches0. Polypropylene can easily be conditioned in a known manner, with it common types of printing inks stick to it. Polypropylene also had other properties worthy of improvement z. Ba it is relatively hard, shiny and forms a smooth surface.

It also resists penetration or deformation by grease and liquids. For this description it should be assumed that the polyethylene film is unwound from a roll during method step 112, the underside of which is already conditioned for the uptake of printing inks so that these printing inks help on the sub-site.

Method step 114 of FIG. 11 consists in creating a pattern 116, 118 (Figure 3) is printed on the underside of the polyethylene film 110. Any common printing process can be used to make the pattern multicolored can be to muster. For example, a plastic sheet 110 can have a first pattern 116 in one ink and have a second pattern 118 in another ink, the positionally matched to the first pattern 116 in a subsequent printing step is, haban, depending on the printing process used before printing of the second pattern, the first pattern 116 may or may not be dried.

The color samples are in any case after completion of the printing process dry.

Reference numeral 120 in Fig. 14 denotes a coating layer made of polyethylene, which is used as a binding material for attaching the plastic film 110 is used on the plate body 126. This layer is on the bottom of the film 110 over the printed pattern 116, 118 that extends between the. Polyethylene cover 120 and the underside of the film or sheet 110 is located. The unoriented Polyethylene has a softening point between about 104 and about 129 ° C (220 and 265 ° F), for example from about 5 to about 50 ° C (10 to about 90 ° F) is lower than the softening temperature of the polypropylene used as the base liner 110 is used. The softening temperature of the latter is about 135 to about 160 ° C (275 to about 320 ° F) depending on the method after the polyethylene film was made. In addition, polyethylene is easily penetrated Use of heat to combine with polypropylene and also goes well with Pressed paper pulp from which the container or plate base body 126 is made is to connect. the polyethylene film or cover 120 may have an initial thickness from about 0.013 mm (0.0005 inches) to about 0.10 mm (0.004 inches), however in any case, the thickness of the coating material is very small compared to that Thickness of the outerwear material 110.

Step 120 in FIG. 11 indicates the unrolling of a polyethylene film 120 from a roll that is the same width as the polypropylene sheet 110. The polyethylene is coated with the polyethylene sheet in any conventional coating process heat sealed. Step 122 indicates an alternative printing method in which the color samples 116 and 118 directly on the upper surface of the polyethylene film 120 instead on the bottom of the Polypropylene film 110 can be printed. It it will be understood that the polyethylene coating 120 is also made by extrusion can be and the step 120 can in this case also the direct application of the polyethylene coating on the underside of the lining material 110 in a continuous manner Include procedure.

With this alternative, the printing process 122 is of course omitted. Whether the polyethylene coating 120 is extruding directly onto the polypropylene sheet 110 or whether the polyethylene film 120 is first made and then either printed or is not printed and is finally connected to the lining 110, the layer formation from the polyethylene film and the polypropylene film is through the step 116 in Figure 11 indicated.

The following step represents a step in the coating process dart in which the printed and laminated lining material on a Roll wound or in some other way can be temporarily saved before it is applied to the plate bodies 126.

Numeral 139 in Figure 11 indicates the molding step in that of the container or plate body 126 by pressing a slurry a fibrous one Pulp formed with a suitable device will. The device has a shape and a hidden drying male mold with the a relatively strong and rigid open-topped container can be made * How e shown in FIG. 14, the plate base body 126 has a lower part 127f a side part 128 extending obliquely upwards and one in a radial direction Edge portion 129 extending outward in the direction.

In the case of the procedural steps, which are used to connect the plastic lining 110 are used with the base body 126, this base body 126 is either leave it in the form in which it was pressed or the body becomes one Another shape transported that has the same shape as the underside of the base body Has. One of these forms is achematic in Figures 15 and 16 by the lower one Geaenk 131 shown. The base body 126 either stores residual heat from the Pressing process in which it was produced, or it is preheated to a temperature d e e wa less than or greater than the softening temperature of the polyethylene coating 120, but less than the softening temperature of the polypropylene lining material 110 is. This heating is indicated by step 140 in FIG. That lower die 131 is made by heating elements 132 that are located in the same are located (see Figures 15 and 16), heated. It will be such a preheating of the base body 126, the application of a liner according to this invention is preferred however, it can also be carried out with success if the main body has not been used beforehand was heated.

In the same way, during step 130 according to FIG. 11, the Polyethylene coating 120 preheated on the film 110 by, for example, the Polie is passed over a heated roller. Preheating takes place at a temperature in which the polyethylene coating 120 becomes sticky or melts. This preheating, takes place immediately in front of the heated film with the polyethylene layer facing down But the edge 129 of the container body 126, as shown in Figure 15, is brought. However, it is emphasized that the coated film or the coated film 110 does not have to be preheated and that step 130 is omitted may when the molded body 126 is raised to a temperature during step 140 Heated above the softening temperature of the polyethylene coating 120 on the polie has been. That means either the foil or the base body must be preheated or both @@ en are preheated. The latter measure is @@ ver @@ gs.

The lining film is attached to the base body in the with the reference number 133 in Figure 11 designated step, which is shown in detail in Figures 12, 15 and 16 is illustrated; upset. As shown in Figure 12 daru, the die 131 be one of four dies in a four-part mold 131a, so that two rows are formed by two containers each, on each of which the decoids 121 are applied. As best shown in Figures 12 and 15, a piece of film 110 is placed over the device during method step 133 131a pulled to a position with four printed patterns 116 and 118 just above the four base bodies 126 come to rest. An upper hollow die 136 is over and aligned with each lower die 131, and all dies 134 are therefor simultaneous vertical displacement, from a position in which they are at a distance of the corresponding Formez 131 (not shown), in a position in which aie clamp the edges 129 of the base body, as shown in Figures 12 and 15, forward.

Wio) is shown in Figure 17, a circumferentially extending and downwardly extending knife 152 connected to each upper die 134 be to the single liners 121 from the continuous Filmstrip 110 when the dies 134 are closed, as shown in FIG is.

Alternatively, as shown in Piger 12, the polishing material can be made from which the four separate liners 121 are formed from the long ribbon of film be cut off with a knife 136 actuated in the vertical direction. At this Alternatively, however, a subsequent cutting of the film must be carried out to the lined taller either after or at the same time as the liner step As illustrated in FIG. 15, during the arrangement of the foils 110 over each base body 126 the mold 131 further by heating coils 132 heated.

The actual application of the liner to the base body is shown in FIG. With reference to this Figure 16, it is emphasized that that the lower mold 131 has a lower connection 1 140 which leads to a vacuum pump (not shown) leads. The bottom of the mold 131 has a plurality of openings 142, which enable a vacuum to be passed on to the underside of the base body 126. Since the grand body is made of a porous material, the vacuum can do it penetrate and if therefore the line 140 to the vacuum pump connected each individual liner 121 will be firmly attached to the upper side of the corresponding one Base body 126 used. To ensure tight engagement between the liner and The upper part is used to support the main body during this process step Geaenkhohlraum 134 provided rosit air supply line 144, through the compressed air that can be fed to the upper or outer pluche of the foil clothing 121 works. In a preferred embodiment of this invention, a Vacuum between about 75 mm (3 inches) and about 00 mm (4 inches) Hg across the line 140 is maintained in the mold 131 and the air pressure is from about 2.8 to about 3.5 atü (4) to 50 pai). this air pressure acts on the upper surface 50 psi). 121 mg for the time required to effect the firm procedure. This time is about 2 seconds.

It was a combination of air pressure and vacuum as described preferred, but it can also be a single measure of fixed surgery of the heated boundary layers of the lining 121 and the base body 126.

It is particularly emphasized that the temperature at which the film separation 121 or the base body 126 or both during step 133 in which the film is applied, heated, selected so that the primary liner 110 Polypropylene does not become sticky or soften. That means the temperature is greater tils dia igue at which the polyethylene coating 120 begins to melt, however smaller than that at which the lining material 110 melts. In this context It is emphasized that the edge of the upper die 134, that with the edge 129 and the edge part of the pile 121 engages to press them tightly together, is heated to the same temperature (by means not shown) so that the edge of the foil is test connected to the plate. Do material 110 10 each The individual lining 121 thus remains hard, smooth, shiny and transparent throughout the joining step. Due to the transparency of the film 110 the colors and patterns 116 and 118 appear clearly through the film and impart the surface of the finished plate 119 has an attractive appearance. With attention the relative softening temperatures of polyethylene and other plastic materials It must also be borne in mind that other plastics that have the required surface properties and the required Have elasticity, such as polyolefins (polypropylene, Polyethylene, etc.) can be used as main lining materials 110, E.g. a polyethylene with a softening temperature of over 120 ° C (250 ° F) and in any case about darjanigen a lower density polyethylene that used as a binder, applied with success merde as with the reference number 146 indicated in Figure 14 is the upper surface of the pulp molded base 126 often wavy or otherwise rough and uneven, which is due to the pulp compression process is conditional. in this case, it is assumed that the heated coating material 120 melts and flows into the spaces between the fibers of the Gond nus 126 and after cooling, engages in the pasers and feat is connected to them. Alternatively and probably depending on how close to the softening temperature The coating 120 and the liner 121 can be heated, this liner 121 and the cover 120 stretched over these cavities and only with the raised areas of the irregular pattern. In any case, it does not matter whether the surface of the body is brewed or not, after cooling, the liner 121 was found to be extremely smooth and hard on their top or usable area after the Plate 190 was manufactured in the manner described.

The cooling steps are denoted by the reference numerals 150 and 160 in FIG indicated either or both of which can be applied to the fully lined Plate 190 to a temperature below the softening temperature of the coating 120 to cool, creating the bond between the liner 121 and the base body 126 is made permanent. Although not shown, step 150 suggests this Open the mold by lifting the upper die 134 134 n, disengaging it comes with the edge 129 of the plate 190. During this mode of operation, the vacuum on the underside of the plate, keep the lining still hot 121 remains in firm connection with the base body.

The air pressure through the die 134 is also reduced for a short period of time maintained when the mold is opened and while the mold 134 is still in operation is in the immediate vicinity of the plate 190, the air flow, the room temperature is used has to cool the liner 121 somewhat. Alternatively, a high vacuum can be used from about 400 to 450 mm (16 to 18 inches) Hg through interconnect 144 im Top die lids are applied when the mold is partially open, around Suck in air at room temperature. Such a flow of air can sufficient to cool the plate.

However, if necessary, the plate can be cooled further or completely be chilled by putting a jet of cold water into the plate as through the crotch 160 is indicated, is irradiated.

As is also indicated in Figure 11 and depending on it, whether or not subsequent trimming of the liner may be required the plate making process include a snoid step 162. This The cropping step is not shown, but it is possible to crop the Edge part 129 of the container with reducing the order of the same, if desired, lock in. The cutting step is analogous to the step shown in FIG insofar as an annular knife 152 actuated in the vertical direction The bottom is to remove excess polie and excess material from the base body cut off at the edge of plate 190.

Ale coating120, which serves as a heat-sensitive binding agent, can when using propylene as the main lining material, also other plastics, which have the required properties compared to the skin lining material haban, may be used, although polyethylene sheeting has given the best results. In any case, the adhesive coating can be relatively thin, so that if for example Polyethylene is used, the final strength of the dried surface of the finished product Plate 190 is only about 0.005 mm (0.002 inches). Next can be a relative thick polyethylene film has been used when heating the same during the Application to the container 126 takes place relatively quickly, so that only the underside the film becomes sticky.

The softening temperature difference between coating 120 and the polie t10 should be between about 11 and 17 ° C (20 to 30 ° F) for convenience and when using a polypropylene film on a container is adhered to a polyethylene film, the temperature difference is preferable something big, e.g. B. is a polypropylene liner with a softening temperature from 160 ° C (320 ° P) to the base body 126 using a polyethylene with A softening temperature of about 104 ° C (220 ° F) is applied by the liner 121 to a temperature of about 115 ° C (240 ° F) to 132 ° C (270 ° F), preferably 126 ° C (260 ° F) is heated.

It is further emphasized that if polyethylene or some other plastic Is used in film form as a binder or binder, dio consideration of the Main lining material with this binder at the same time as the application the lining can be done on the base body. With reference to the presentation in Bigur 15 this means that the decorated sheet 110 is made of polypropylene and one below it lying separate film made of polyethylene brought over the mold 131 at the same time can be, after which it is shown during step 133 as in FIG Polyethylene at the same time as the base body 126 and the underside of the film 110 is connected. In this method, only the base body 126 is brought to a temperature above the softening temperature of polyethylene, but below the softening temperature of the polypropylene heated.

The finished plate 190 can withstand temperatures of 115 to 126 ° C (240 to 260 ° F) for extended periods of time, allow the liner 121 to loosen.

Claims (1)

Patent claims r 1. Method for lining a container or the like with @ a plastic layer that has a softening point at a has a predetermined temperature, characterized in that this layer (25a, 110) from a first plastic on the ester (20, Mi) call use a layer (23b, 120) is applied from a second plastic, which has a softening point at a temperature which is lower than the heating temperature of the eraten Kunstatoffes fdr the lining solder and that the connection of the second plastic with the container takes place by heating at least this second plastic to a temperature, which is at least equal to the softening temperature of this plastic, but smaller than the softening temperature of the first plastics forming the lining, 2. Method of lining an open-topped container or the like with a Plastic layer after spoke 1, dsdnroh gekenmzeich that a thin plastic film is brought over the opening of the container that as plastic for this plastic foil a material with a softening point at a specific temperature is chosen will, dafi the plastic film on the side facing the container is coated with a second plastic film that has a softening point at a certain temperature which is lower than the softening temperature of the plastic from which the first foil b @ staht that the yoliensohichtung feet is pressed on the upper edge of the container, d a printing medium and / or a Vacuum can be used with the 13oreLob of the film or film layering, the Cber the container opening lay everywhere on the inner surface of the container below its edge to be pressed, w heat is applied at the same time that the film is layered on heated to a temperature which lies between the two softening temperatures, and that the coating is then brought to a temperature below the softening temperature of the wider plastic is cooled, causing the lining to become the plastic is glued to the inner surface of the container. , 3. The method according to claim 2, characterized in that the Poliensohiohtung by applying heat before or after lining the container with the container rim is glued. 4. The method according to any one of claims 2 or 3, characterized in that that before the polie is pressed into the container, it at least to the softening temperature the second plastic is heated, 5. Procedure after a of claims 2 or 3, characterized in that the central zone of the Plastic layer before this into the ShEter. is pressed to a temperature heated and kept at this temperature, which is below the softening temperature the second plastic lies. 6. The method according to any one of claims 4 or 5, characterized in that that the layer is essentially at the appropriate temperature immediately before before the polie is introduced into the container. 7. The method according to any one of claims 1 to 6, characterized in that da8 the container at least to the softening temperature of the second plastic rhitst will. 8. The method according to claim 7, characterized in that the container has a closed end and that this geachlosaena end to a temperature e, which is higher than the temperature at which the rest of the container orwllrmt. 9. The method according to any one of claims 2 to 8, characterized in that that the pressure and / or the vaouum act first in a direction which is perpendicular to the plane of the polie, lots are oriented around the polie, at least at the edge to stretch forward and that the film is then drawn into the container in the other direction and because it is stretched further. , 10. The method according to claim 9, characterized in that the Pre-stretching takes place in the forum of a hood-shaped arch, the HUho of which is smaller than is the depth of the container. 11. The method according to claim 10, characterized in that the height the dome-shaped configuration of the fore is at least equal to the hilote of the depth don bustes iet. 12. Method according to one of claims 9 to 11, characterized in that that at least the edge region of the film within the container edge during the Foreheading is warmed. 1. The method according to Anspruoh 12, characterized in that the edge region is heated during the pre-stretching by successively ring areas of this edge area be heated and the heating progressively from the outer edge of the container see below the middle of the polio e takes place. 14. The method according to any one of claims 9 to dadah, that the film is pre-stretched between the container edge so that a substantially unstretched middle area adjoins the edge area and that the edge area stretched more than near the central region during pre-stretching near the container rim so that a difference in strength is obtained. 15. The method according to any one of claims 9 to 14, characterized gekennzeichnot, that the position of the edge area after the pre-stretching is chosen so that this edge area an angle of essentially 70 ° with the plane through the edge of the container is intended, includes. 16. The method according to claim 15, characterized in that d the central region is essentially just chosen. 17. The method according to any one of claims 2 to 16, characterized in that that when the finished container cools at least the bottom of the same by pouring is quenched by water. 18. The method according to any one of claims 1 to 17, characterized in, that as the plastic for the first film that forms the lining, a transparent one Kunstatoff is used and that one ornament between the two plasticollons is intruded. 19. The method according to claim 18, characterized in that the ornament is made with a trookenable printing ink that is applied to one of the two plastic films is printed and dried before connecting. 20. The method according to any one of claims 1 and 9 to Igi, characterized that a deep-drawn container is used for all containers. 21. The method naah one of claims 1 to 20, characterized in that that the first plastic f for the film forming the lining is polypropylene is used. 22. Process according to one of claims 1 to 20, characterized in that that aln erater plastic for the film forming the lining ie polyethylene is used. 23. The method according to any one of claims 1 to 22, characterized that the second plastic for the I bond causes the layer of polyethylene is used. 24. The method according to any one of claims 1 to 23, characterized in that that the first and the second plastic are first formed in separate films and then the film made of the first plastic with the film made of the second plastic is coated. 25. The method according to any one of claims 20 to 24, characterized in that da8 a paper container filter is used as the basic container body. 26. Apparatus for performing the method according to one of the preceding Claims, characterized by a lower die (45, 52) which the container (21) so that its upper edge (26) remains open, through an upper die (46, 68), which can be placed tightly on the lower die and in this position surrounding the open end of the container, the cavity of the upper die being a has dome-shaped configuration positioned over the open end of the container is, when the upper die is placed tightly on the lower, by means, in order to produce the seal wprme and by means of a print and / or a vacuum in the upper and lower Geserk lumen when the device is closed is to generate, these facilities by the pressure generated and the generated Vacuum a force in at least the direction of the lower die towards the coating film (23) exercise. 27. The device according to claim 26a, characterized in that the hood-shaped Iloblraxun a middle part (68b) and a side part with an inner part has inside inclined wall (68c). 28. Device according to Claim 27, characterized in that the inclined Side wall with the middle part forms an angle essentially of 1160. 29. Device according to claim 27 or 28, characterized in that that the central part is substantially flat, 30. Vorriobtung according to one of the claims 27 to 29, characterized in that the hood-shaped cavity has a transition part between the inclined side wall part and the middle part with a relatively large Has radius of curvature. 31. Device according to one of claims 27 hie 30. d @@ urch, dal the means for applying the heat which causes the connection have to at least the inclined side wall of the hood-shaped cavity Erwprmen, 32. Device according to Claim 31, characterized in that the two auxiliary devices Have means for heating the central part of the hood-shaped cavity, and that the means for applying the heat of the seal have such means to the temperature of the middle part of the hood rises below the temperature of the side part keep. 33. Device according to claim 32, characterized in that there is at least the middle part of the hood is covered by a semi-insulating material. 34. Apparatus according to claim 33, characterized in that the semi-insulating material is paper. 35. Device according to one of claims 27 to 34, characterized by that the sleeve forming the upper die has a plurality of spaced apart openings (77) disposed around and substantially close to the periphery of the middle part of the hood are arranged to put a Druak and / or a Vaouum in to continue the hood-shaped cavity. 36. Device according to claim 35, characterized in that the upper @ die is combined with a compensation space and that the openings are n extend between the compensation space and the hood-shaped cavity. 37. Device according to one of claims 26 to 36, characterized in that that the height of the dome-shaped cavity is equal to about 1/2 to about 3/5 of the inner Corresponds to the height of the container. 38. Device according to claims S6bie37 characterized by that the upper die has an edge bead (68e) at its lower end which protrudes into the lower ßesenk when the device is closed. 39. Device according to one of claims 26 to 38, characterized in that that the lower die has a cannula at its bottom for porting a vaeouum, 40. Device according to one of claims 26 to 38, characterized in that the lower die has ejectors at its bottom. 41. Apparatus according to claim 40, characterized in that on the ground of the lower die a recess is provided in the request of the same that the Ejection device for the container has an ejection plate (56), the normalerbaise is arranged in the recess and that means are provided to the ejection plate to give a radial movement. 42. Apparatus according to claim 4 characterized in that the lower die channels between the ejection plate and the recessed middle part of the lower die and that the channels which are used to conduct the vacuum are intended to extend into the lower die cavity. 43. Device according to one of claims 40 to 42, characterized thereby d the bottom of the lower die has a hand groove (52b), which the anch below the protruding collar (21b) of the container and that the ejection devices have a plunger (50) which lays closer to the meiaeer groove during executions It is planned to move the Wbon into this groove, so that the with The downward protruding collar of the container comes into grip. 44. Device for carrying out the method according to one of the Anaprilohs 1 to 25, characterized by means to put a slide over the open end to arrange the container by punching devices that have a knife that the w md OroBe corresponds to the outer periphery of the container rim, by means to move this knife, to cut out a sheet of foil or a sheet of foil, through lines that aufweiaan a sealing head (38) with an annular edge (38a), the the size and shape of the container razade! corresponds, by means of heating this ring edge at least to the sealing temperature of the plastic, through facilities In order to move the sealing head, there is a bit on the edge of the foil blank In engagement comes rial cite Folle is pressed onto the container end by in which losenk provided @ hann facilities su heating the container and @as follon blank in mesentllchen to the sisgel temperature of the Plastic and through Devices to exert pressure on the foil blank or the foil disc, so that it is stretched and applied to the interior of the container. 45. Apparatus according to claim 44, characterized in that the Knife surrounds the edge of the sleevehead and slides on it. 46. Device according to claim 45, characterized in that the the Bonding causing edge of the sealing head part of the underside of the same lot and da9 several at a distance from one another on the periphery: a of the gelkoptes Channels (43) are arranged in the edge of this Siegolkopfes. 47. Device naoh Anspruoh 46, characterized in that the Channels extend from a point on the underside of the seal head close to it Edge is located, extend to a surface that is facing the knife 1st. 48. Containers having an open top, a bottom, and a seamless Lining made of plastic, which is firmly connected to the container, characterized in that that the entire inner surface of the container is lined and the liner by means of another plastic sand that inner surface is glued on. L e r s e i t e