JP6007563B2 - Paper cup manufacturing method and annular leg forming heater device - Google Patents

Description

  The present invention relates to a paper cup manufacturing method and an annular leg forming heater nozzle.

  There is a paper cup container in which a beverage such as juice is filled in a paper cup and the upper opening is sealed with a lid. The paper cup used for this paper cup container uses a body member blank and a bottom member blank obtained by punching a laminated sheet in which a thermoplastic resin layer such as polyethylene is provided on both sides of a paper substrate into a predetermined shape. A paper cup is generally used in which a bonded portion is provided to form a cylindrical body member, a bottom member blank is folded at one end and a bottom member provided with a peripheral edge portion is attached and molded.

  In such a paper cup container, when protecting the paper base material constituting the container from moisture inside the container and moisture outside the container and further needing barrier properties against gases such as oxygen and water vapor, as a laminated sheet of the trunk member, For example, from the front side, using a laminated sheet such as polyethylene / paper substrate / polyethylene / aluminum foil / polyethylene terephthalate film / polyethylene or polyethylene / paper substrate / polyethylene / plastic film having an inorganic oxide deposited layer / polyethylene Often, molded paper cups were used.

  However, in the body part bonding part of the body member, simply by overlapping and bonding the both ends of the body member blank, the end face of the laminated sheet constituting the body member is exposed and moisture or the like enters from the paper. Since the metal components of the layer and the barrier layer are eroded, various methods have been considered for protecting the end face.

  As a method for ensuring the barrier property of the paper cup body pasting part, an end face processing (edge protection) method called skive hemming that protects the end face of the body member located on the container inner surface side of the paper cup body pasting part is known. It has been.

  In this method, the outermost layer edge portion of the body member made of a laminated sheet obtained by laminating a thermoplastic resin on a paper base is skived (cut) so that the thickness of the body member is about half. Next, half of the skived (cut) portion is hemmed (turned back) so that the deleted surface is on the inside, and the paper end surface is protected with a thermoplastic resin.

  The skive hemming process requires complicated processing steps, and furthermore, a paper sheet is generated because the laminated sheet including the paper base material is skived (cut). When this paper dust is mixed into the product, it becomes a serious problem, but its complete removal is difficult.

  As a method for producing a water-resistant paper cup without performing a skive hemming process, a method for producing a paper cup using a blank whose end face is covered with a film has been proposed (for example, see Patent Document 1). ).

  In the paper cup having water resistance, which protects the end surface of the paper base material, the inner edge of the body portion bonding portion is formed by extending the thermoplastic resin layer from the paper base material throughout. Yes.

Thus, the film of the thermoplastic resin layer extending from the paper base material is irregularly formed during cup molding, and it is sufficient to cover the end surface of the paper base material which is the original purpose. There was something I couldn't do. Moreover, the finish as a paper cup was bad and there existed problems, such as a malfunction produced in appearance.

  Therefore, at least one thermoplastic resin layer on the inner surface side is provided with a resin portion protruding a predetermined width from the paper base at one side end of the body member blank, and the protruding resin portion is covered with the end of the paper base. It has been proposed to form a body bonded portion by folding back and overlapping and closely contacting the inner surface of the other side end of the body member blank (see Patent Document 2).

  In the case of this paper cup, a flange portion is formed by winding the upper end edge of the body member into the opening, but a step portion due to the thickness of the paper base material is generated in the flange portion. For this reason, when the lid material is stacked on the upper surface of the flange portion and heat-sealed as it is, the step portion cannot be reliably sealed. In particular, when the flange portion is in a flat state, the influence of the thickness of the base material was large.

  In order to eliminate the influence of the paper thickness of the base material, notches are provided on the upper side edges of the body member blank made of a laminated sheet in which the paper is used as a base material and a thermoplastic resin layer is provided on the inner surface. The side edge located inside the body bonding part of the body member blank is provided with a resin part extending from the side edge of the paper base material, and the resin part is folded back to the outer surface side of the paper base material. It has been proposed to use a body member blank having a folded resin portion.

  By overlapping the side edge of the side having the folded resin part of the body member blank so as to be inside the other side edge, forming the body part bonded part, the inner surface in the body part bonded part A paper cup is obtained in which the end face of the paper substrate on the side is coated with a thermoplastic resin layer.

  In the case of this paper cup, since the notch is provided in the upper part of both side edges of the body member blank, the flange portion formed by winding the upper end edge of the body member more than once around the opening is formed on the base material. There is no step due to the thickness of the paper, and the flange is flattened by pressing the flange from above and below to eliminate the step. As a result, when the lid member is sealed to the flange portion, there is no leakage due to a step, and a sealing property is obtained (see Patent Document 3).

  Thus, a paper cup container in which the end surface of the paper base material is protected has been developed. As shown in FIG. 9, the annular leg 16 covers the body member so as to cover the peripheral edge 10 of the bottom member 8a of the paper cup. Although the lower part of 1a is turned inward and the lower return part 14 is provided and the lower end of the peripheral part 10 of the bottom member 8a is protected, it is an edge part ahead of the lower return part 14 which turned the trunk | drum member 1a. Insufficient protection of the end face (indicated by the arrow in the figure) and the problem of being vulnerable to water intrusion remained.

  As means for solving this problem, as shown in FIG. 10, a lower folded portion 14 formed by folding a trunk member 1a having a trunk bonded portion 9 inside, and an end portion of the folded trunk member are further provided. A lower end portion and an upper folded portion of the body member 1a are provided in a state in which an upper folded portion 15 that is folded inward is provided and a peripheral edge portion 10 that is bent and provided below the bottom member 8a is inserted into the lower folded portion 14. A paper cup of a retort sterilization paper cup container in which an annular leg portion 16 is formed by closely contacting 15 and the peripheral edge portion 10 of the bottom member 8a has been developed (see Patent Document 4).

  In the formation of the paper cup, the annular leg portion 16 of a general paper cup is formed by providing a barrel portion laminating portion 9 and a peripheral edge portion 10 that is bent downward inside the barrel member 1a that has a cylindrical shape. As shown in FIG. 11, the peripheral portion 10 in close contact with the body member 1 a is inserted into the annular leg portion heater 11 from the inner side of the annular leg portion 16. After heating with hot air blown from 12, the lower end edge portion of the body member 1a is folded inward so as to cover the peripheral edge portion 10 of the bottom member 8a to form the lower folded portion 14, and the folded body member 1a is formed into the bottom member 8a. It joins to the outer surface of the peripheral part 10 of this, and the cyclic | annular leg part 16 is formed (refer patent document 5).

  When only the peripheral edge 10 in close contact with the body member 1a, such as the above-described annular leg forming heater device 11, is heated with the annular leg forming heater nozzle 12 as shown in FIG. 12, the annular leg forming heater is used. Even if the outer ring 13 surrounding the bottom of the body member 1a to the upper end of the bottom member 8a is provided so that the hot air blown from the nozzle 12 warms the outer surface of the body member 1a, the lower folded part 14 and the upper folded part In the paper cup of the retort sterilizing paper cup container provided with 15, the lower folded portion 14 and the tip portion thereof are hardly heated, so the adhesion is deteriorated.

  Therefore, due to retort sterilization or the like, moisture enters between the portion between the lower folded portion 14 and the upper folded portion 15 and the tip portion from the upper folded portion 15, and the paper from the tip of the peripheral edge portion 10 of the bottom member 8 a. Moisture enters the substrate, causing deterioration in strength and poor appearance.

  Further, when the temperature of hot air is raised to improve the adhesion, the paper base material may be burnt. Therefore, the hot air blowing port of the annular leg forming heater nozzle 12 is widened up and down, and the peripheral portion 10 in close contact with the body member 1a and the body member on the distal end side from the peripheral portion 10 are widely blown out as a whole. When heated, the area over which hot air is blown widens, making it difficult to heat uniformly and causing variations in bonding.

Japanese Patent Laid-Open No. 51-122666 JP 2005-272010 A JP 2008-222245 A International Publication No. 2010/150500 JP 2003-11249 A

  The present invention has been made in view of the above-described circumstances. In the annular leg portion of the paper cup, the deterioration of the strength and the appearance failure may occur due to moisture entering the paper base material from the edge of the peripheral edge of the bottom member. An object of the present invention is to provide a paper cup manufacturing method and an annular leg forming heater nozzle.

The invention according to claim 1 of the present invention is such that the bottom member having a peripheral portion bent downward is inserted into the inside of a cylindrical body member having a body bonding portion, and the periphery contacting the body member And the lower end inner surface of the body member with the hot air blown from the annular leg forming heater nozzle, respectively , and the hot air is rotated under the body member to the outside of the body member, and the lower end outer surface of the body member after heating, and the lower folded portion provided by folding the lower portion of the barrel member inside the ends of the folded said cylinder member further provided an upper folded portion folded inward, the tip from the upper folded portion The annular leg portion is formed by pressing and closely contacting the lower end portion of the body member, the upper folded portion, and the peripheral portion of the bottom member so that the side portion overlaps the peripheral portion. It is a manufacturing method of a paper cup.

  The manufacturing method of the paper cup of the present invention has the above-described configuration, and in the annular leg portion, strength deterioration and poor appearance occur due to moisture entering the paper base material from the edge of the peripheral portion of the bottom member. There is nothing.

The invention according to claim 2 of the present invention is an annular leg forming heater device used in the paper cup manufacturing method according to claim 1, and comprises an annular leg forming heater nozzle and an outer ring. And
The annular leg forming heater nozzle divides hot air from the air passage into two upper and lower heater nozzles, the upper heater nozzle is in a position where the hot air hits the peripheral edge in contact with the body member, and the lower heater nozzle is in the body The upper nozzle and the lower nozzle are each arranged so as to come to a position where the hot air hits the inner surface of the lower end of the member, and the upper nozzle and the lower nozzle are provided so as to direct the hot air from the air passage toward the inner peripheral surface side of the body member ,
The outer ring surrounds from the bottom of the body member to the upper end of the bottom member, and the hot air of the heater nozzle passes under the body member, passes through the outside of the body member 1a, and warms the outer surface of the body member. Located in the
An annular leg forming heater device characterized by the above.

  The annular leg forming heater nozzle of the present invention has the above-described configuration, and by using this, the method for manufacturing the paper cup can be reliably implemented.

  According to the paper cup manufacturing method of the present invention, there is no deterioration in strength and poor appearance due to moisture entering the paper base material from the edge of the peripheral edge of the bottom member in the annular leg portion of the paper cup. Moreover, if the heater nozzle for forming the annular leg portion of the present invention is used, the method for producing the paper cup can be surely carried out.

It is explanatory drawing which showed typically the paper base material processed by the trunk | drum member blank manufacturing process of an example of the manufacturing method of the paper cup of this invention with the plane. It is explanatory drawing which showed typically the cross-sectional sheet which provided the thermoplastic resin layer in the trunk | drum member blank manufacturing process of an example of the manufacturing method of the paper cup of this invention. It is explanatory drawing which showed typically the blank manufactured with an example of the manufacturing method of the paper cup of this invention with the plane. (A) trunk member black, (B) bottom member blank. It is explanatory drawing which shows typically the cross-section of the trunk | drum bonding part by the manufacturing method of the paper cup of this invention. (A) The body bonding part of the shape which does not fold the resin part of the left and right end edges, (B) The body bonding part of the shape of only one of the resin parts of the left and right edge edges, (C) It is the trunk | drum bonding part of the shape where both the resin parts were turned back. It is explanatory drawing which showed typically the cyclic | annular leg heating process of an example of the manufacturing method of the paper cup of this invention. (A) (B) (C) It is explanatory drawing which showed typically the cyclic | annular leg part in the cyclic | annular leg part formation process of an example of the manufacturing method of the paper cup of this invention in the cross section. (A) (B) It is explanatory drawing which showed typically the flange part in the flange part formation process of an example of the manufacturing method of the paper cup of this invention in the cross section. It is explanatory drawing which showed typically the paper cup manufactured from the example of the manufacturing method of the paper cup of this invention in the cross section. It is explanatory drawing which showed typically the cyclic | annular leg part by an example of the manufacturing method of the conventional paper cup in the cross section. It is explanatory drawing which showed typically the cyclic | annular leg part by the other example of the manufacturing method of the conventional paper cup in the cross section. It is explanatory drawing which showed typically the heating of the annular leg part by an example of the manufacturing method of the conventional paper cup. It is explanatory drawing which showed typically the heating of the annular leg part by the other example of the manufacturing method of the conventional paper cup.

  Hereinafter, modes for carrying out the present invention will be described.

  The paper cup manufacturing method of the present invention includes the following steps. That is, a blank production step (a) for making a trunk member blank and a bottom member blank, a trunk member blank as a cylindrical trunk member, a bottom member blank is bent downward, and a peripheral member is provided as a bottom member. Member processing step (b), annular leg heating step (c) for inserting the bottom member into the body member and heating the annular leg, and annular leg forming step (d) for bending and crimping the heated annular leg And the flange portion forming step (e) in which the upper opening portion is wound outside and the flange portion is provided.

  FIG. 1 is an explanatory view schematically showing a paper base material processed in the body member blank manufacturing process as an example of the paper cup manufacturing method of the present invention in a plan view.

  First, the blank manufacturing process (a) will be described. As shown in FIG. 1, the trunk member blank 1 is printed by allocating the trunk member blank 1 to a roll-shaped paper substrate 2. At this time, the trunk member blank 1 has a fan shape or a rectangular shape, and is provided with notches 3a and 3b at the upper portions of both left and right edges. And the long window 4 is perforate | pierced in the outer part including the edge in the right-and-left both-ends edge of the trunk | drum member blank 1. FIG.

  FIG. 2 is an explanatory view schematically showing a cross-sectional view of a laminated sheet provided with a thermoplastic resin layer in the body member blank manufacturing process as an example of the paper cup manufacturing method of the present invention.

  A thermoplastic resin layer 5 is provided by extrusion laminating on the inner surface side and outer surface side of the paper base material 2 in which the long windows 4 are formed, and a laminated sheet 6 is formed as shown in FIG. At this time, the resin part 7 in which the thermoplastic resin layers 5 from the inner surface side and the outer surface side are welded to the long window 4 portion is formed.

  When the paper cup is required to have a barrier property, a barrier paper in which a thermoplastic resin is provided on both surfaces of the barrier film is laminated on the inner surface side of the body member blank 1 by a sandwich lamination method.

The paper base 2 to be used is appropriately selected depending on the size of the paper cup, the intended use, and the like. Usually, paper having a basis weight of 150 to 300 g / m ² is used.

  As the resin for the thermoplastic resin layer 5, polyethylene, polypropylene, or the like is preferably used. In particular, when using a paper cup for retort sterilization, heat-resistant polypropylene is preferably used. In some cases, other thermoplastic resins such as heat-sealable nylon and polyester can also be used.

  Examples of barrier films include polyester films and nylon films, laminated films obtained by laminating polyester films and nylon films stretched on aluminum foil, vapor deposited films obtained by depositing aluminum and inorganic materials on stretched polyester films and nylon films, or the resin itself. An ethylene vinyl alcohol copolymer film having a high barrier property can be used.

  FIG. 3 is an explanatory view schematically showing a blank produced by an example of the paper cup production method of the present invention in a plan view. (A) is a trunk member black, and (B) is a bottom member blank.

  From the laminated sheet 6, the trunk member blank 1 is formed by cutting or punching so that the resin portion 7 of the long window 4 portion remains in the trunk member blank 1 as shown in FIG. Thereby, the trunk | drum member blank 1 in which the resin part 7 was formed in the right-and-left both ends edge is obtained.

  On the other hand, the bottom member blank 8 forms the laminated sheet 6 by extruding the thermoplastic resin layer 5 on the inner surface side and the outer surface side of the roll-shaped paper base material 2 by the laminating method. When barrier property is required, the barrier paper which provided the thermoplastic resin layer 5 on both surfaces of the barrier property film similarly to the trunk | body member blank 1 is laminated | stacked by the sandwich lamination method on the inner surface side. The bottom member blank 8 is punched out from the laminated sheet 6 and is prepared as shown in FIG.

In the member processing step (b), the body member blank 1 is wound around a mandrel, the left and right edges of the body member blank 1 are overlapped and heated to be welded, and the body portion bonding portion 9 is provided. Set to 1a. Before wrapping around the mandrel, one or both of the resin portions 7 at the edge of the body member 1a may be folded back so that the folded resin portion 7 is inside the body bonding portion 9.

  FIG. 4A is an explanatory diagram schematically showing a cross section of the body bonding portion 9 having a shape that does not fold the resin portions 7 at the left and right edges. FIG. 4B is an explanatory view schematically showing a cross section of the body bonding portion 9 having a shape in which only one of the resin portions 7 at the left and right end edges is folded back. FIG. 4C is an explanatory view schematically showing a cross section of the body bonding portion 9 having a shape in which both of the resin portions 7 on both the left and right edges are folded back.

  On the other hand, the bottom member blank 8 is bent into a bottom member 8a having the peripheral edge 10 bent downward by press molding or the like.

  FIG. 5 is an explanatory view schematically showing an annular leg heating step as an example of the paper cup manufacturing method of the present invention.

  In the annular leg heating step (c), as shown in FIG. 5, the bottom member 8 a having the peripheral edge portion 10 bent downward is inserted into the cylindrical body member 1 a having the body bonding portion 9. The peripheral edge 10 in contact with the body member 1a and the inner surface of the lower end of the body member 1a are heated by hot air blown from the annular leg forming heater nozzle 12 of the annular leg forming heater device 11, respectively.

  The annular leg forming heater nozzle 12 divides the hot air from the air passage into two upper and lower nozzles, and the upper heater nozzle 12a is positioned at the position where the hot air hits the peripheral edge portion 10 in contact with the body member 1a. Are arranged so as to come to a position where hot air hits the inner surface of the lower end of the body member 1a.

  The lower heater nozzle 12b has a vertical center at a position of 0.5 to 2.0 mm above the lower end of the body member 1a, and a horizontal distance from the lower end of the body member 1a to the tip of the lower heater nozzle 12b is 0. It is arranged so that it is located at a position of 5 to 1.5 mm, and the position of the upper heater nozzle 12a is such that the horizontal distance from the peripheral portion 10 is such that hot air hits the peripheral portion 10 whose tip is in contact with the body member 1a. It is provided so as to come at a position of 0.5 to 1.5 mm within a range where it can be inserted from the lower end of the cylindrical body member 1a.

  The upper heater nozzle 12a and the lower heater nozzle 12b respectively blow hot air from the air passage through the slits at the periphery thereof through the upper and lower two disk-shaped plates so as to go to the inner peripheral surface of the body member 1a. It is formed to let it come out. Or the some small nozzle branched from the ventilation path is extended and formed toward the inner surface of the trunk | drum member 1a radially.

  Further, the annular leg forming heater device 11 is provided with an outer ring 13 so as to surround from the bottom to the upper end of the bottom member 8a, and the hot air blown from the upper heater nozzle 12a and the lower heater nozzle 12b is supplied to the body member 1a. After heating the peripheral edge portion 10 in contact with the inner surface of the lower end portion of the body member 1a, it passes under the body member 1a, passes through the outside of the body member 1a, and warms the outer surface of the body member 1a. It is designed to heat efficiently.

  The annular leg forming heater device 11 including the annular leg forming heater nozzle 12 including the upper and lower nozzles and the outer ring 13 is provided from the lower side of the body member 1a in which the bottom member 8a is inserted. As described above, the peripheral edge 10 in contact with the body member 1a and the inner surface of the lower end of the body member 1a are heated with hot air.

  6 (A), 6 (B), and 6 (C) are explanatory views schematically showing in cross section the formation of leg portions in the annular leg forming step of an example of the paper cup manufacturing method of the present invention.

  As shown in FIG. 6 (A), after the peripheral edge 10 in contact with the body member 1a, the inner surface of the lower end of the body member 1a (the position indicated by the arrow in the figure) is heated, the annular leg forming step (d) Then, the lower folded portion 14 is provided by folding the lower portion of the body member 1a inward, and the end portion of the folded body member 1a is further folded inward as shown in FIG. 6 is formed so that the portion on the front end side from the upper turn-up portion 15 overlaps the peripheral edge portion 10 of the bottom member 8a, and then the outer side is pressed with an outer mold and pressed with a knurling from the inner side so as to adhere to each other. As shown in (C), the annular leg 16 is completed.

  In this way, the peripheral edge portion 10 in contact with the body member 1a and the inner surface of the lower end portion of the body member 1a are heated with hot air and are pressed and brought into close contact, so that the annular leg 16 is sufficiently welded. ing. Therefore, moisture does not enter between the portion between the lower folded portion 14 and the upper folded portion 15 and the tip portion from the upper folded portion 15, and the paper base material from the distal end of the peripheral edge portion 10 of the bottom member 8 a. Moisture enters 2 and does not cause deterioration in strength or appearance failure.

  7 (A) and 7 (B) are explanatory views schematically showing a flange portion in a flange portion forming step of an example of the paper cup manufacturing method of the present invention in cross section. FIG. 8 is an explanatory view schematically showing in cross section a paper cup manufactured from an example of a method for manufacturing a paper cup according to the present invention.

  Next, the flange portion 17 is provided in the flange portion forming step (e). First, as shown in FIG. 7A, the upper end of the trunk member 1a is wound outward one or more times so that the upper end of the trunk member 1a is inside the flange portion 17, and the paper base of the upper end portion of the trunk member 1a is placed. Prevent water from entering material 2. Further, the flange portion 17 is pressure-bonded from above and below to form a flat flange portion 17 as shown in FIG.

  Moreover, since the notch parts 3a and 3b are provided in the upper ends of both ends of the body member blank 1, when the flange 17 is formed by winding the upper end of the body member 1a outward one or more times, the body part bonding part In FIG. 9, the overlapping state is almost the same as the other portions, and the step of the flange portion 17 can be eliminated.

  Through the above steps, a paper cup as shown in the cross-sectional view of FIG. 8 can be manufactured. Thus, according to the paper cup manufacturing method of the present invention, the manufactured paper cup is free from moisture or the like penetrating the paper base 2 from the inside or the outside at the flange portion 17 and the trunk portion bonding portion 9. Further, since the annular leg portion 16 is firmly welded, moisture does not enter between the portion between the lower folded portion 14 and the upper folded portion 15 and the tip portion from the upper folded portion 15. There will be no deterioration in strength or appearance defect due to moisture or the like entering the paper substrate 2 from the tip of the peripheral edge 10 of the material 8a.

  And by filling the contents into this paper cup and heat-sealing the film-like lid material on the flange portion 17, high temperature and high pressure sterilization is performed with a boil sterilization or steam or hot water type retort sterilization pot. Is possible. It is also possible to heat with hot water when eating.

DESCRIPTION OF SYMBOLS 1 ... Body member blank 1a ... Body member 2 ... Paper base material 3a, 3b ... Notch part 4 ... Long window 5 ... Thermoplastic resin layer 6 ... Laminated sheet 7 ... resin part 8 ... bottom member blank 8a ... bottom member 9 ... body pasting part 10 ... peripheral part 11 ... heater device 12 for forming annular leg part ... annular leg Part forming heater nozzle 12a ... upper heater nozzle 12b ... lower heater nozzle 13 ... outer ring 14 ... lower folded part 15 ... upper folded part 16 ... annular leg 17 ... Flange part

Claims (2)

A bottom member having a peripheral portion bent downward is inserted into the inside of a cylindrical body member having a body bonding portion, and the peripheral portion in contact with the body member, and an inner surface of the lower end of the body member, Are heated with hot air blown out from the annular leg forming heater nozzle, and the hot air is rotated to the outside of the body member under the body member to heat the outer surface of the lower end portion of the body member, and then the lower part of the body member is A lower folded part is provided by folding back inside, an end part of the folded body member is folded further inward to provide an upper folded part, and a portion on the tip side from the upper folded part overlaps the peripheral part. Then, a lower end portion of the body member, the upper folded portion, and a peripheral portion of the bottom member are pressed and brought into close contact with each other to form an annular leg portion. An annular leg forming heater device used in the method for manufacturing a paper cup according to claim 1, comprising an annular leg forming heater nozzle and an outer ring,
The annular leg forming heater nozzle divides hot air from the air passage into two upper and lower heater nozzles, the upper heater nozzle is in a position where the hot air hits the peripheral edge in contact with the body member, and the lower heater nozzle is in the body The upper nozzle and the lower nozzle are each arranged so as to come to a position where the hot air hits the inner surface of the lower end of the member, and the upper nozzle and the lower nozzle are provided so as to direct the hot air from the air passage toward the inner peripheral surface side of the body member ,
The outer ring surrounds from the bottom of the body member to the upper end of the bottom member, and the hot air of the heater nozzle passes under the body member, passes through the outside of the body member 1a, and warms the outer surface of the body member. Located in the
An annular leg forming heater device characterized by the above .

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