DE1960654A1 - Filter, as well as method and device for producing a continuous filter rod - Google Patents

Description

PATENT LAWYERS

DK.ING. H. NEGENDANK · ■ dipl.-ing. H. HAIJCK · Dipl-Phys. W. SCHMITZ

HAMBURG-MUNICH 1960

DELIVERY ADDRESS: HAMBURG 36 NE UER WALL 41

TEL. 3 6 74 88 TTND 3 6 4 110

KLEGB. TJBGEDAPATBNT HAMBUHG MUNICH 15 MOZARTSTR. 33

TEL.538O5 86

TEI ₁ BQR. NBQEDAPATENT MUNICH

HAMBURG,

p: \

Filter, as well as method and device for the production of a continuous filter rod.

The invention relates to improvements in or in Connection with smoke filters for cigarettes or other objects of smokers' needs such as cigars.

Various designs of smoke filters have already been proposed and put into practical use, which have a composite nature and substances contained in granulated, powdery or other form. Such a filter may be in the form of a cylindrical tubular Have wrapping with a nozzle (e.g. made of paper or cellulose acetate fibers) at both ends, the

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The space between the nozzles is filled with a granulated or powdery substance. Such a filter is usually connected to one end of a cigarette by a strap looped around the outside.

For the sake of simplicity, substances that are in a granulated, powdery or similar nature and are suitable for the production of a filter are to be referred to as "loose material ^11. "

A problem that arises with filters of this type is the difficulty of ensuring that the smoke drawn in by the smoker through the filter passes through the loose material and does not get past it. During filter manufacture, it can be difficult to ensure that the space between the nozzles is completely filled with loose material. Even if these difficulties advertising eliminated Λ the can and the rooms are fully filled in newly manufactured filters is not yet ensured that the spaces fill their notice, over the period until the filter cigarettes reach the customer. The handling and transport of the filters before they are connected to the cigarettes, the effects of the machines by means of which they are connected to the cigarettes, and the handling and transport of the filter cigarettes

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the distribution of loose material (if this material is compressible) change and lead to a stronger compression of the material, whereby the greater the risk of undesired compression is "the more the loosener material is squeezed together" leaves, so that gaps can arise * dpreh which of the! too can pass through instead of through the loose filter material to go through.

If the loose material is very compressible, there is another problem that is caused by the smoker The pulling force exerted on the cigarette creates a large density gradient along the material, thereby creating a unacceptably high pressure drop occurs primarily where the material is tightly packed. This The greater the volume of loose material, the greater the problem is through which the smoke is attracted.

Even if the finely powdered material is not or almost impossible to compress a high degree of compaction is required to avoid the risk of smoke on the material got past. Therefore, if the pressure drops across the material are kept at an acceptable level it is necessary to determine the axial length of the To restrict material occupied space * which in turn

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a reduction in the filter efficiency to sebum

The invention is therefore according to a first aspect directed at a filter with loose material.

The invention provides a filter for a cigarette or created another object intended for smoking * in which the loose material in separate layers porous elements disposed between the layers is held, which are arranged so that from one end to the other the breath passing through the filter must inevitably pass through these layers one after the other.

The filter proposed according to the invention is also characterized in that an annular envelope has a Nozzles or a filter piece encloses which has a number of porous, disc-shaped elements, the elements keep separate layers of loose material between them and "are arranged in planes transverse to the axis of the filter, so that smoke passing through the filter in the axial direction must inevitably pass over and through these layers.

The proposed filter for a cigarette or other article of smoking demand has loose material which enthalten.ist in an annular chamber having an Rauoh- at one end a RaucheinlaÄ and at its other end

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having outlet, wherein the outlet is arranged offset in the radial direction with respect to the inlet, so that smoke passing through from the inlet to the outlet inevitably in substantially radial directions through the loose material must pass through.

A tubular casing surrounds a filter piece of porous paper or similar material that is folded or otherwise formed so that it is forms a plurality of layers running essentially concentrically in the longitudinal direction of the filter, between which there are layers of loose material, from one to the other other end of the filter flowing smoke inevitably in a substantially radial direction either outward or must pass inward one after the other through the essentially concentric layers.

The filter can, for example, have sealing elements at the opposite ends of the nozzle or filter piece, one of which smoke only through a central one that is connected to a centric axial duct of the filter piece Recess, and the other sealing element smoke only through one or more arranged on its circumference (e.g. between its circumference and the inner surface of the tubular envelope) and with one or more, in axial seal

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extending outer channels or spaces between the tubular casing and the outermost layer or the outermost layers of the filter piece can pass through annular channels. Thus, it can only be at one end entering smoke escape through the other end that it more or less in the radial direction through the successive layers of porous material and bulk material either from the central channel to the outer channels or g from the outer channel to the central channel passes, which is dependent in each case on the orientation of the filter with respect to the flow direction. Since each layer of loose material is made thin and the smoke is drawn in through each layer one after the other, only insignificant compaction of the loose material can occur. In addition, each layer of loose material is held between layers of porous paper or the like, which prevent a noticeable displacement of the loose material, as a result of which the smoke could get past the material. "

The invention is also directed to a machine for making a strand by which a filter is made that has a non-axial filter path.

The manufacturing device proposed according to the invention a continuous filter line has device

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_ * 7 ■ _

gene through to the formation of at least two axial channels a filter and, devices for sealing only the one end of each channel so that a non-axially extending Path for the one passing through the filter rod Rough is formed *

The device for the production of a continuous filter rod is characterized according to the invention by

a) Devices for fastening individual sealing elements on a continuous porous belt at regular intervals Spacing along the length of the tape,

b) devices for applying a finely divided filter material to the continuous porous belt,

c) Devices for cutting the porous tape lengthways into several strips,

d) devices for stacking several strips on top of each other,

e) devices for folding the stacked strips into several concentric tubes in the shape of a cylinder, the concentric tubes being held at a mutual radial distance from one another by some sealing elements and the central channel of the cylinder at intervals along its length by other sealing elements is closed, and

f) Devices for the formation of a continuous outer envelope around the cylinder, with the outer

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Enclosed by the aforementioned some sealing elements held at a distance from the cylinder and an annulus between the cylinder and the envelope is formed.

According to one feature of the invention, devices are provided which are used to form the envelope forming depressions serving tape, which serve to hold the cylinder in the lateral direction in the layers, where no seal is provided for this purpose.

The proposed method of making a continuous According to the invention, the filter strand consists of the following procedural steps that:

a) individual sealing elements on a continuous porous tape at intervals along the length of the tape be attached,

b) a finely divided filter material is applied to the continuous porous belt,

c) the porous tape is cut lengthways into several strips, which are then stacked one on top of the other will,

d) the stacked strips into several concentric ones Tubes folded in the shape of a cylinder, the concentric tubes through some of the sealing elements

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are kept at a mutual radial distance and spaced along the central channel of the cylinder its length is closed by other sealing elements, and -.

e) a continuous outer envelope is formed around the cylinder and for the purpose of forming an annular space between the cylinder and the envelope by the aforementioned sealing elements at a distance from the Cylinder is held.

The inventive proposed filter piece contains the Combination of the following elements:

a) several concentric tubes made of porous material, which are arranged at mutual radial distances and contain a finely divided filter material in their mutual spaces,

b) a plurality of ribbons arranged at each end of the tubes, each ribbon in a space between two adjacent tubes is arranged and serves to keep the two tubes at a mutual radial distance to keep,

c) a filter piece which has one end of the centric one running through the innermost tube in the radial direction Recess closes, and

d) a tubular envelope «which encloses the outermost tube and is attached to one end of the filter by means of

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directions is kept at a distance from the outermost pipe, which allows smoke to pass between allow the outermost tube and outer envelope, the space between the outermost Tube and the outer casing is blocked by an annular seal.

The practical implementation of the invention will be described in the following on the basis of exemplary embodiments with reference to the enclosed Drawings explained in more detail in which:

1 shows a schematic section through a filter connected to a cigarette,

FIG. 2 is a greatly enlarged section of FIG. 1, FIG. 3 is a modified version of the filter shown in FIG. 1, FIG. H is another filter version, FIG. 5 shows an enlarged section of a filter similar to the filter of FIG. 1 , and

Figures 6 and 7 a schematic representation of the method and the device for producing the filters shown in FIG.

The filter shown in Fig. 1 abuts one end Cigarette section 1 and consists of a plug or filter piece 2 made of porous paper or the like. In several Layers 3 (see Fig. 2) folded, rolled up or otherwise

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Arranged in a manner that is essentially concentric, to each other in the longitudinal direction of the filter. Between, The porous layers 3 are made of loose material%, which is held by the porous layers 3. On the opposite Sealing elements are located at the ends of the filter piece 5 and 6. There is also an end nozzle or mouthpiece 7, which can consist of a conventional filter element made of e.g. paper or cellulose acetate fibers, and a tubular one Envelope 8 is provided, which encloses the aforementioned components.

The filter piece 2 has a central axial channel 9, and an annular axial channel or space Io is located between the tubular casing 8 and the outermost layers of the filter piece. The channels can be designed to be essentially hollow and empty or they can have spacer elements such as ribs running in the axial direction or a porous material through which smoke can flow unhindered in the longitudinal direction of the filter.

The sealing elements 5 and 6 illustrated in the drawing, the beeseren clarity in greater thickness can be made relatively thin and made of any material which is suitable to seal the ends of the filter piece. 2 The element 5 has a mitti ge recess 11, which on the one hand directly with the

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centric channel 9 and on the other hand with the interior of the Cigarette sections is in communication. The outer edge of the element 5 is in sealing contact with the tubular casing 8. The element 6 has on its circumference annular spaces or annular channels 12, which on the one hand directly with the annular space or annular channel Io, and on the other hand are in communication with a chamber 13 located between the element 6 and the end connector 7,

This arrangement ensures that substantially the whole, through sucked from the cigarette through the filter into the mouth of the smoker smoke necessarily over and through the layers 3 made of porous material and the layers held therebetween ¹ J of loose material in a generally radial directions must pass through. The flow directions of the smoke are indicated generally schematically in FIG. 1 by arrows. The smoke can only enter the filter element 2 through the central recess 11 and leave the filter element only through the spaces or channels Io. Thus, the elements 5 and 6 together with the tubular casing 8 form a tubular chamber containing the loose material, through which the smoke must necessarily pass in essentially radial directions.

The arrangement of the elements 5 and 6 can also be reversed, ■ o that the smoke inevitably radially inwards

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00884OHtSI

must flow, instead of in the manner shown in FIG outward.

By means of an arrangement of the embodiment shown in Fig. 1 (or the above-mentioned modified embodiment) it can be ensured that the smoke passes through a sufficient amount of loose material without increase the pressure drop to an unacceptable level as the smoke passes through successive thin layers of material passes, in which no or only an insignificant compression can occur. It also prevents that the loose material shifts so far that the smoke can get past him because the loose material is held between the layers of porous paper or other similar material.

In contrast to known filters with loose material the pressure drop across the filter according to the invention by increasing the length of the filter piece in which the Loose material is held, decrease, as this increases the surface area through which the smoke can pass can.

In Fig. 3, a modified embodiment is shown, in which oind two filter plugs 2 are provided one behind the other _s are separated from each other by a sealing member 26,

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which the sealing element 6 of the Pig. I corresponds to. Sealing elements 25, which correspond to element 5 in FIG. 1, are located at opposite ends. The path of the smoke through this structure is shown by arrows. In this modified embodiment, the central sealing element 26 can be replaced by an element 25 with a central recess, and the elements 25 located at the opposite ends can each be replaced by two elements which correspond to the elements 26. "

The porous paper or the like, which forms the layers 3, can be corrugated, roughened or otherwise provided with unevenness , in order for its part to help prevent the loose material from shifting.

In Fig. 4, a further embodiment according to the invention is shown. In this embodiment, the loose material 4 is placed between disks 23 made of porous material such as, for example held porous paper, which are corrugated, roughened or otherwise deformed so that they hold the loose material against displacement. The disks 23 are arranged in an axial order between two conventional nozzles or mouthpieces 27 and the peripheral edges of the disks are in sealing contact with the tubular casing 28.

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BATH ORIGINAL

In this embodiment, smoke drawn in from the cigarette section 1 flows generally in the axial direction through it Filter and through the successive thin layers of loose material between the porous discs 23 is held.

In all of the embodiments described above, the filter and the cigarette section are joined to one another at the end butting position held by a band led around the outside, which covers the whole filter or part of it and is guided over part of the cigarette section. This band, which is led around, is not shown in the drawings, as it is known per se for filter cigarettes.

In FIG. 5, a longitudinal section of a continuous filter rod is shown, which is replaced by that shown in FIG Machine can be manufactured. The filter rod has an outer wrapping lol made of thin paper, which surrounds a paper tube Io2. Concentric tubes from Io3 thin backing paper are immediately surrounded by a thin, porous paper Io9 and are located within the Serving lol and io2 pipe. The concentric porous paper tubes hold finely distributed items in their interstices Filter material. An axial recess ΙοΊ is through the concentric Tubes made of porous paper Io3 passed through.

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The porous paper tubes Io3 carry in along their length Distances, which correspond to the length of a filter piece, each a ring formation of concentric rings of thick Paper Io5.

Every second concentric ring of paper Io5 has between Put a band of soft paper Io6 on the outermost ring and the tube Io2.

The outermost ring of the other, concentric rings made of Io5 Paper between every other set of concentric rings is in contact with depressions Io7 made in the tube Io2 are designed and serve to prevent these alternating concentric paper rings Io5 from shifting to the side to keep. The same rings have a stub Io8 made of non-porous material inside their innermost Link on, with the nozzle I08 the axial recess Io4 blocked. {

The continuous strand of which that shown in FIG Forming only a part of the cutout, in the middle of each ring formation of concentric rings Io5 cut through according to the line A-A.

A filter piece produced in this way has the smoke passage indicated by the arrows. Self-

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Understandably, the directions of the arrows can also be reversed.

A device for the production is now intended with the aid of FIG of a pilter strand can be described in accordance with the illustration in FIG. 5. The same reference numerals should be used to denote those parts of the device to illustrate the formation or supply of corresponding elements for the continuous shown in FIG Serve filter rod.

The upstream side of the device shown in FIG is on the right, and the downstream side is on the left of the drawing.

At the far end of the upstream is the machine a continuous band of thin backing paper Io3 is fed. On the underside of the porous carrier paper Io3 non-porous nozzle Io8 at intervals which correspond to the distance between two filter pieces, attached, and on the On the top of the tape Io3, strips of thick paper Io5 are attached at intervals which are the length of a piece of filter correspond, with every second strip Io5 corresponding to the illustration in FIG. 7 with a connecting piece Io8 is aligned. The strips Io5 and the nozzle Io8 are held to the tape Io3 by an adhesive. The for Attachment of the strips Io5 and the studs io8 in the

devices serving at regular intervals are shown schematically at Ho and 111. .

The belt Io3 is then passed below a filling funnel 113, through which finely divided filter material, for example in powder or granulated form, is applied to the belt. The provided with filter material band Io3 then passes through a cutter 114 which cuts the tape Io3 longitudinally into six strips, whose widths are each graded such that they are suitable for the formation of the six concentric tubes Io3 '5 shown in Fig..

The cut tape Io3 is then passed through a device 115 passed through, which serves to cut up the six Stack strips of tape on top of each other, with the narrowest Tape strip is brought to the top of the stack.

Below the stack of cut strips Io3 is Then a tape of thin, porous paper Io9 is inserted, after which the paper Io9 and the strips Io3 are glued 116 pass through, which applies an adhesive line along one edge of the thin porous paper Io9. Then the ribbons are fed into a folding device 117 which stores the stack of porous papers Io3 and the like porous tape Io9 forms a strand, after which the adhesive

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fabric line along the paper Io9 in a heater 118 is heated to put the paper Io9 around the cut Tapes to seal Io3 around. The trained in this way The strand is then surrounded by a stiff paper tube Io2, being ribbons of soft paper Io6 every other row surrounded by thick paper rings Io5 and every intermediate second row of rings Io5 comes into engagement with recesses Io7 of the thick paper tube Io2. These operations are carried out by removing a tape of thick paper Io2 is pulled from a spool and passed through a mouthpiece device 119. The mouthpiece device 119 a strip of porous paper Io6 is fed through the nozzle device 119 in FIG Cut strips, then applied to the tape Io2 and is held on this by an adhesive. The tape Io2 with the paper strips Io6 adhering to it then passes through two wheels 12o rotating in opposite directions, which in predetermined Circumferential distances have projections, which to serve, during the passage of the belt io2 between the wheels 12o, the depressions Io7 along the belt Io2 in certain To be attached longitudinal distances, which each correspond to two filter piece lengths.

The tape Io2 is then taken from below the heater 118 emerging strand together with this in a second combination of gluing device 121, folding device

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BATH ORIGINAL

122 and heater 123 introduced _s in which the exiting of the preceding heater 118 strand with the stiff paper Io2 and the outer sheath Io1 wound from thin paper, wherein the enclosure lol to form the finished filter strand shown in Fig. 5, along its one edge is glued to itself.

The device described above is designed for the production of a filter with finely divided filter material, * which must be kept against excessive compression, which can be caused, for example, as a result of the air sucked in by the smoker through the filter. The finely divided material normally compresses due to the pulling action to such an extent that it creates an unacceptable pressure drop across the material and thus renders the cigarette non-smokable. By using a series of concentric, fine and porous tubes Io3> passing through the rings Io5 at a mutual distance | are held, several annular containers are practically formed for the finely divided filter material. Although in this arrangement, each individual, filled with filter material annulus may be exposed under the influence of the pulling action of a radial compression, there occurs no excessive amount of resistance to draw or pressure drop <äui ^l eh the FilcerriateAiai. on, as the rings turn held at mutual distances by the porous cylinder Io3.

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BATH ORIGINAL

Claims (1)

Claims '! ./ filter for a cigarette or other smokeless object, characterized in that loose material (4) in layers separated by interposed between the layers of porous elements (3 _S 23, Io3) is held which are arranged to that smoke passing from one end of the filter to the other must necessarily pass through these layers one after the other. ti 2. Filter according to claim 1, characterized in that a tubular casing (8, lol) has a filter piece (2) made of a series of porous, disk-shaped elements (23) enclosing the elements between them separate layers of loose material (4) and are arranged in planes transverse to the axis of the filter, so that through in the axial direction the smoke passing through the filter must inevitably pass over and through these layers. 3. Filter according to claim 1, characterized in that loose material is contained in a tubular chamber which at one end has a smoke inlet (11) and at the. at the other end has a smoke outlet (12), the outlet being offset in the radial direction with respect to the inlet, so that smoke passing from the inlet to the outlet is inevitably in substantially radial directions through the looker - 22 009840/1111 material must pass through. 4. Filter according to claim 1, characterized in that a tubular casing (8) consists of a filter piece (2) porous paper or equivalent material that is folded or otherwise formed so that it forms several layers running essentially concentrically in the longitudinal direction of the filter, between which there are layers of loose material and that flowing from one end to the other of the filter Smoke inevitably in a substantially radial direction either outwards or inwards one after the other the essentially concentric layers must pass through. 5, filter according to claim 4, characterized in that sealing elements at the opposite ends of the filter piece (2) (5, 6j 25) are arranged, one of which smoke only through one with a central axial channel (9) of the filter piece connected central recess (11), and the other sealing element smoke only by one or more, arranged on its circumference and with one or more extending in the axial direction outer channels or spaces (lo) between the tubular envelope and the outermost layer or layers the feed piece located annular channels (12) can pass. 003840/1158 " ²³ " 6. Device for producing a continuous filter rod, characterized by devices for the formation of at least two axial channels through a filter ring and devices ¹ for sealing only one end. axially running ¥ eg flr ^{1 of} the dlurefe the Filfcerstrang is gefeildefe. T «Tarr'ichfcung; Stir the preparation of a kontinaieFlichen Filfcerstranges _s characterized by the combination of a) Gate directions (Ho, 111) for fastening individual sealing elements on a continuous porous belt (Io3) at regular intervals along the length of the Band, b) Devices (113) for applying a finely divided Filter material on the continuous porous belt, c) Devices (114) sum cutting the porous building idea in the longitudinal direction into several strips, d) devices (115) used to create multiple strips to stack on top of each other, e) devices (117) for folding the stacked strips in several concentric tubes in the shape of a cylinder, the concentric tubes through some sealing elements (Io5) are kept at a mutual radial distance and the central Ktnal - 24 - 009840/116 (9) the cylinder is closed at intervals along its length by other sealing elements (Io8), and f) Devices (121, 122) for forming a continuous outer covering around the cylinder, the outer covering being held at a distance from the cylinder by the aforementioned several sealing elements and a space (Iq ² I) being formed between the cylinder and the covering , 8. The device according to claim J _3, characterized in that devices (12o) are provided which serve to form depressions (Io7) in the tape used to form the envelope, which are used to hold the cylinder in the lateral direction in the layers, where no seal is provided for this purpose. 9. Process for making a continuous Pil ™ terstranges, characterized in that a) individual sealing elements (1ο5 * Io8) on a continuous porous tape (Io3) attached at intervals along the length of the tape, b) a finely divided filter material (4) is applied to the continuous porous belt, c) the porous tape is cut lengthways into several strips, which are then stacked one on top of the other will, 008840/1158 " ²⁵ " BATH ORIGINAL d) the stacked strips into several concentric ones Tubes folded in the shape of a cylinder, the concentric tubes through some of the sealing elements. ', are kept at a mutual radial distance and the central channel (9) of the cylinder at intervals is closed along its length by other sealing elements, and e) a continuous outer around the cylinder Sheath formed and for the purpose of forming an annular space between the cylinder and the sheath through the aforementioned sealing elements is held at a distance from the cylinder. Io * filter piece, characterized by the combination a) several concentric tubes (3) made of porous material, which are arranged at mutual radial distances and contain a finely divided filter material (4) in their mutual interspaces, b) a plurality of bands arranged at each end of the tubes (Io5), each band being arranged in a space between two adjacent tubes and serves to keep the two tubes at a mutual radial distance, c) a filter piece (2), which one end of the is closed by the central recess (9) extending in the radial direction, the innermost tube, and - 26 - 009840 / 11SI d) a tubular casing (8, lol), which the outermost tube and at one end of the filter by devices (Io7) at a distance from the outermost pipe is held, preventing the passage of smoke between the outermost pipe and the outer Allow envelope, the smoke between the outermost tube and the outer envelope through a ring-shaped seal (Io8) is blocked. I. 11. Cigarette filter, characterized in that the filter is formed according to the description and Figures 1 and 2 or Figure 3 or Figure 4 or Figure 5 of the drawings . 12. VorxAshtung for the manufacture of cigarette filters, characterized in that the device is essentially the description in connection with Figures S and 7 ä corresponds to the drawings. 15 · Process for the production of a cigarette filter, characterized in that the process essentially corresponds to the description with reference to FIGS. 6 and 7 of the drawings. 009840/1158 BAOORtGlNAt