JP4617791B2 - Processing method for end face of paper container and paper cup barrel member - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a paper container and a paper cup, and in particular, a paper container and a paper cup having a structure in which the manufacturing process is relatively simple and the end face of the paper is not exposed at a place where the contents such as a liquid material contact, and the paper container And a paper cup manufacturing method.

  A paper cup that is filled with beverages such as juice and that has an upper opening sealed with a lid and has excellent barrier properties is composed of, for example, polyethylene / paper / polyethylene / aluminum foil / polyethylene terephthalate film / polyethylene from the front side. In general, it is formed of a laminated sheet.

  In order to require barrier properties, for example, the inside of the joint part of the body member constituting the body part of the paper cup is scraped by removing half of the thickness of the laminated sheet by a predetermined length from the tip (skive). The other half is folded (hemming) so that the deleted surface is on the inside, and the edge of the paper is protected.

  However, in order to perform the above-mentioned skive hemming on the paper end surface, it is necessary to perform a skive hemming process on the paper end surface using a special machine before forming a blank punched into a paper cup. There has been a demand for improvement in terms of paper dust generation.

As a method of producing a paper cup having excellent barrier properties without performing skive hemming, a method of producing a paper cup from a blank whose end face is covered with a film has been proposed (for example, see Patent Document 1).
Japanese Patent Publication No. 58-43264 (Claim 1).

However, in the paper cup having this barrier property, the inner edge of the body bonded portion is formed by the thermoplastic resin layer protruding from the paper base material as a whole. When the film of the resin layer is formed into a cup, there are problems such as irregular formation of the resin layer, hindering the original purpose of covering the end face of the paper, and deterioration of the appearance of the paper cup. is there.
In addition, since the skive end faces are aligned, it is difficult to perform cup molding simultaneously with skive hemming with a cup molding machine.

  The present invention has been made in view of the above-described problems that occur when a container having excellent barrier properties is formed using a body member formed with a film made of a thermoplastic resin layer protruding from one edge. The paper cup such as a paper cup and the like that does not interfere with the coating of the paper end surface and has a clean appearance as a paper cup and the paper cup or paper container directly from the roll-shaped paper substrate It is an object of the present invention to provide a method for manufacturing a paper container and a paper cup to be a paper container.

The invention of claim 1 of the present invention is composed of a laminated sheet based on a paper having a thermoplastic resin layer provided on at least an inner surface, and one end of a blank is overlapped with the other end. In the paper container in which the body part bonded portion is formed to form a cylindrical body member, and the upper and lower openings of the body member are directly or folded and heat-sealed, one edge of the blank is an inner surface The side thermoplastic resin layer protrudes from the paper base by a predetermined width to form an edge protection resin layer, and the edge protection resin layer is folded outward in the vicinity of the edge of the paper base. Covered and adhered to the inner surface side of the other edge of the blank, and a barrier layer is provided between the paper base material and the thermoplastic resin layer, and the edge protection resin layer of the blank is coated with paper. Approximately 90 ° with the comb-shaped first member from the inner surface side to the outer surface side of the container The edge protection resin layer that has been pushed and bent at an angle, and then pushed and bent by a comb-like second member at an angle of about 90 ° from the outer side to the inner side of the paper container, and finally pushed and bent to protect the edge. A paper container, wherein the edge-protecting resin layer is temporarily bonded to an end surface of a blank paper substrate by pressing the comb-shaped third member with the resin layer directed inward from the outer side of the paper container. It is the processing method of the end surface of .

  Thus, according to the first aspect of the invention, at least one thermoplastic resin layer on the inner surface side protrudes a predetermined width from the paper base to form an end surface protective resin layer on one end edge of the blank, and the end surface protective resin is formed. The layer is folded outward near the edge of the paper substrate, covered with the paper substrate end surface, and bonded to the inner surface of the other edge of the blank, so it was molded into a paper container. At this time, the paper end surface of the body laminating portion inside the container is neatly covered with the end surface protective resin layer, and the contents do not come into contact with the paper end surface.

Thus, according to the invention described in claim 1, since the barrier layer is provided between the paper base material and the thermoplastic resin layer, and the end portion of the paper base material is covered with the barrier layer at the body portion bonding portion, A paper container excellent in barrier properties can be produced.

As described above, according to the first aspect of the invention, the edge protection resin layer of the blank is pushed and bent at an angle of approximately 90 ° by the comb-shaped first member from the inner surface side to the outer surface side of the paper container, and then pressed. The bent edge protection resin layer is pushed and bent by the second comb-shaped member at an angle of approximately 90 ° from the outer side to the inner side of the paper container, and finally the bent edge protection resin layer is pushed to the outside of the paper container. Since the edge-protecting resin layer is temporarily bonded to the end surface of the blank paper base by pressing the comb-shaped third member from the direction toward the inner side, one end of the blank is connected to the other end When forming a cylindrical body member by overlapping the body part, the edge protection resin layer formed on one edge is fixed to the paper substrate.
Therefore, it is possible to form a torso bonded portion that is clean and stable.

Further, the invention of claim 2 is composed of a laminated sheet based on paper having a thermoplastic resin layer provided on at least the inner surface, and one end of the body member blank is overlapped with the other end. Forming a cylinder bonded portion to form a cylindrical body member, with the peripheral edge of a substantially circular bottom paper standing downward to form a bottom member, and the inner surface of the peripheral edge of the bottom member on the lower inner surface of the body member The lower end edge of the body member is bent inward so as to cover the periphery, and joined to the outer surface of the periphery of the bottom member to form an annular leg, and the upper periphery of the body member is wound outward. In the paper cup formed with the lip portion, one end edge of the body member blank of the body portion bonding portion has at least an inner surface side thermoplastic resin layer protruding from the paper base by a predetermined width so that the edge protection resin layer is formed. The edge protection resin layer is formed on the edge of the paper substrate. Is folded in the vicinity of, the coated paper substrate end face, in close contact with the other on one end the inner side of the rim to part bonded body of the cylinder member blank is formed, between the paper substrate and the thermoplastic resin layer A barrier layer is provided, and the edge protective resin layer of the body member blank is bent at an angle of approximately 90 ° with a comb-shaped first member from the inner surface side to the outer surface side of the paper cup, and then the bent edge The edge protective resin layer is pushed and bent by a second comb-like member at an angle of about 90 ° from the outer side of the body member blank toward the inner side, and finally the edge protection resin layer is pushed and bent toward the outer side of the body member blank. A method for treating an end face of a paper cup barrel member, wherein the edge-protecting resin layer is temporarily bonded to the end face of the paper base of the barrel member blank by pressing the comb-shaped third member toward the inner side. It is.

Thus, according to the second aspect of the present invention, at one end edge of the body paper of the body portion bonding portion, at least the inner side thermoplastic resin layer protrudes from the paper base by a predetermined width, and the edge protection resin layer The edge protection resin layer is folded back in the vicinity of the end of the paper base, and the end face of the paper base is covered, and is in close contact with the inner surface of the other end of the body member blank. Since the mating part is formed, when the paper cup is molded, the paper end surface of the body laminating part inside the paper cup is neatly covered with the edge protection resin layer so that the contents do not contact the paper end surface. .

Thus, according to the invention of claim 2, since the barrier layer is provided between the paper base material and the thermoplastic resin layer, and the end portion of the paper base material is covered with the barrier layer at the body bonding portion, A paper cup having excellent barrier properties can be produced .

Thus, according to the invention described in claim 2, the edge protection resin layer of the body member blank is pushed and bent at an angle of about 90 ° by the comb-shaped first member from the inner surface side to the outer surface side of the paper cup, The edge-protecting resin layer that has been pushed and bent is bent by a second comb-shaped member at an angle of approximately 90 ° from the outer side to the inner side of the body member blank. The comb-shaped third member is pressed from the outer side of the blank toward the inner side, and the edge protection resin layer is temporarily bonded to the end surface of the paper base of the body member blank, so one end of the body member blank When a cylinder body member is formed by overlapping the edge with the other edge to form a cylindrical body member, the edge protection resin layer formed on one edge is fixed to the paper substrate. It is possible to form a beautiful and stable body bonded portion.

  As described above, according to the present invention, the thermoplastic resin layer protrudes from the one end edge by a predetermined width before one end edge of the blank is overlapped with the other end edge to form the body portion bonding portion. Is folded around the edge of the paper base material and temporarily attached to the paper base material to form an edge protection resin layer, so the edge protection resin layer does not protrude from the paper base material when molded into a container. Molding is possible, leading to improved physical properties such as oxygen barrier properties and water vapor barrier properties.

  In addition, when punching a plurality of blanks assigned to the laminated sheet into blanks one by one, unnecessary parts of the laminated sheet are cut in advance, so that the blank including the edge protection resin layer can be stably Can be punched, leading to quality improvement.

  The present invention will be described in detail below based on one embodiment.

  The paper cup of this invention is comprised from the laminated sheet (3) which makes the base material (1) the paper by which the thermoplastic resin layer (2) was provided in the inner surface at least as shown in FIGS. 1-4, for example. ing.

  One end edge (11) of the body member blank (10) is overlapped with the other end edge (12) to form a body portion bonding portion (15) to form a cylindrical body member, which is substantially circular. The bottom paper is erected with the peripheral edge (21) facing downward to form the bottom member (20), the inner surface of the peripheral edge of the bottom member is joined to the lower inner surface of the body member, and the lower end of the body member is covered so as to cover the peripheral edge. A paper cup in which the edge is bent inward and joined to the outer peripheral surface of the bottom member to form the annular leg (22), and the upper peripheral edge of the body member is wound outward to form the mouth edge (16). is there.

  The one end edge (11) of the body member blank (10) has at least the thermoplastic resin layer (2) on the inner surface side protruding from the paper base (1) by a predetermined width and the edge protection resin layer (4). The edge protection resin layer (4) is formed and folded in the vicinity of the edge of the paper substrate to cover the paper substrate edge (5), and on the inner surface of the other edge (12) of the linerboard It is characterized in that the body part bonding part (15) is formed in close contact.

  In the paper cup of the present invention having such a structure, the end surface of the paper located inside the body portion bonding portion (15) is protected by the edge protection resin layer (4), so that the contents are paper. It does not penetrate from the end face. Further, since the paper end face is protected without complicated skive hemming, paper dust does not adhere to the paper cup, and an improvement in the yield can be seen.

It can also be set as the structure which interposed the barrier layer (2a) between the paper base material (1) and the thermoplastic resin layer (2) (refer FIG.5, FIG.6, FIG.7).
By interposing the barrier layer (2a), a paper cup having excellent barrier properties can be obtained.

Moreover, it can also be set as the structure which provided the thermoplastic resin layer, such as polyethylene, also in the outer surface of the paper base material (1), and provided the thermoplastic resin layer on both surfaces of the paper base material. By adopting a configuration in which the thermoplastic resin layers are provided on both sides, even if a liquid such as water adheres from the outside, the rigidity of the paper substrate does not become weak, and a paper cup having excellent water resistance can be obtained.
Note that such a structure is not limited to a paper cup, and the same can be said for a paper container having a body bonding portion similar to a paper cup.

  Next, a method for producing such a paper cup will be described in detail focusing on a method for producing a body member blank.

  First, a plurality of fan-shaped body member blanks (10) are arranged and printed on a roll-shaped paper base material (1), and one end edge (11) of the body member blank is included in the outer edge. This part is drilled as a long window (13) (see FIGS. 1A and 1B) to the first punching step.

  A body layer blank (10) is printed and a thermoplastic resin layer (2) such as polyethylene resin is laminated on the inner surface of the paper substrate (1) having a long window (13) perforated by a molten resin extrusion method. The laminated sheet (3) is formed, and the edge protection resin layer (4) is formed on the long window portion of the paper base (see FIGS. 2 (a) and (b)) to a thermoplastic resin bonding step.

  Alternatively, the thermoplastic resin layer (2) and the barrier layer (2a) are bonded to the inner side surface of the paper base (1) on which the long window (13) is formed by printing the trunk member blank (10). The composite film is laminated with the thermoplastic resin layer as the innermost surface to form a laminated sheet (3), and an edge protection resin layer (4) is formed on the long window portion of the paper substrate (FIG. 2 (a) ), See FIG. 5) to thermoplastic resin bonding step.

As the barrier layer (2a), aluminum foil, aluminum vapor-deposited plastic film, inorganic compound vapor-deposited plastic film, ethylene-polyvinyl alcohol copolymer saponified film, layered compound-coated plastic film, polyethylene terephthalate film, polyamide film and the like can be used.

  The unnecessary part (14) of the trunk | drum member blank (10) by which the long window part was formed including the edge protection resin layer (4) provided by protruding from the paper base material (1) of a lamination sheet (3) ) Is continuously cut (see FIGS. 3A, 3B, and 6) to a scrap cutting step.

  One sheet formed by punching out a plurality of fan-shaped body member blanks (10) printed from a laminated sheet (3) from which an unnecessary part (14) on one side is cut off to form an edge protection resin layer (4) Each body member blank (10) is produced-a second punching step.

  The body member blank (10) in which the edge protection resin layer (4) protruding from the paper base material (1) by a predetermined width through the respective steps is formed on one edge can be produced.

  Next, a method of temporarily attaching the edge protection resin layer (4) of the body member blank (10) to the paper base end face (5) will be described with reference to FIGS.

  When the edge protection resin layer (4) protruding from the paper base material (1) of the trunk member blank (10) by a predetermined width is formed into a paper cup, the side which becomes the outer surface side from the side which becomes the inner surface side, The first member (D1) in which the pressing protrusion (D11) is formed in a comb shape is moved vertically from the top to the bottom in the vertical direction and is bent and bent at an angle of about 90 ° (FIGS. 9A and 9B). )reference).

  Next, the second member (D2) in which the pressing protrusion (D21) is formed in a comb shape is placed on the body member with the gap (D12) between the pressing protrusion (D11) and the pressing protrusion (D11) of the first member. The edge protective resin layer (4) is pushed and bent by approximately 90 ° from the outer side of the blank toward the inner side, and the edge protective resin layer (4) is the end surface of the paper base on the back side of the body member blank ( 5) is temporarily folded so as to cover (see FIG. 9C).

  Finally, the edge protection resin layer (4) is disposed by pressing the third member (D3), which is disposed below the first member and the pressing protrusion (D31) is formed in a comb-like shape, by pressing vertically upward. The body member blank (10) is temporarily bonded to the paper substrate side (see FIG. 9D). In addition, if the pressing protrusion (D31) of the third member is heated to an appropriate temperature, the adhesiveness of the edge protection resin layer to the paper substrate is improved, which is more effective.

  An example of a forming method for forming a paper cup using the body member blank (10) produced by such a method will be briefly described.

  The end (11) of the body member blank that has been subjected to the end surface treatment is formed on the inner surface side, and the other end edge of the body member blank is overlapped to form the body portion bonding portion (15). Let it be a cylindrical body member.

  The bottom inner surface of the barrel member is joined to the lower inner surface of the barrel member by joining the inner surface of the peripheral portion of the bottom member (20) with the peripheral portion (21) upright with a substantially circular bottom sheet, and further covering the peripheral portion. The portion is bent inward and joined to the outer peripheral surface of the bottom member to form the annular leg (22).

  Finally, the upper peripheral edge of the body member is rolled outward to form the mouth edge (16), thereby obtaining the paper cup of the present invention.

  Next, an embodiment of a method for producing a paper container will be described with reference to FIGS.

  First, a plurality of substantially square blanks (32) having required dimensions are arranged and allocated to a roll-shaped paper base material (31), and an outer side including the edge from one edge (33) of each blank. Is drilled as a long window (34) (see FIGS. 10A and 10B) to the first punching step.

  A thermoplastic resin layer (2) or a composite film in which the thermoplastic resin layer (2) and the barrier layer (2a) are bonded to the inner side surface of the paper base material in which the long window (34) is perforated is used. The laminated sheet (3) is formed so that 2) becomes the innermost surface, and the edge protection resin layer (4) is formed on the long window portion (FIGS. 11A, 11B, and 12). See)-Thermoplastic resin layer bonding step.

  Each sheet of paper in which the required ruled line processing is performed on a substantially rectangular blank from a roll-shaped laminated sheet in which a thermoplastic resin layer is laminated, and the blank is punched to form an edge protection resin layer (4). A container blank (32) is produced (see FIGS. 13A and 13B) to a second punching step.

  A paper container blank (32) in which an edge protection resin layer (4) protruding from the paper base material by a predetermined width through each of these steps is formed on one edge can be produced.

  The method of temporarily attaching the edge protection resin layer (4) of the substantially rectangular paper container blank (32) to the paper substrate end face (5) is basically the same as the case of the fan-shaped body member blank of FIGS. Since they are the same, they are omitted.

  A paper container blank (32) in which the edge protection resin layer (4) is temporarily attached to the paper substrate end face (5) is bent in a sleeve shape along the ruled line, and one edge is overlapped with the other edge. Together, the body part bonding part is formed to form a cylindrical body member, and the upper and lower openings of the body member are bent and heat sealed to form the paper container of the present invention (FIG. 114). reference).

A plurality of trunk member blanks are arranged side by side on a paper base material, and a state in which a long window is formed in an outer portion including the edge at one end edge of the trunk member blank is shown. It is a figure, (b) is AA 'line sectional explanatory drawing of (a). FIGS. 1A and 1B are diagrams illustrating a state in which a thermoplastic resin layer is laminated on one side of the paper substrate of FIG. 1, and FIG. The state which cut | disconnected the unnecessary part of the edge of the lamination sheet of FIG. 2 continuously is shown, (a) is plane explanatory drawing, (b) is the AA 'line cross-sectional explanatory drawing of (a). . One Example of the paper cup of this invention is shown, (a) is fragmentary explanatory drawing, (b) is the A-A 'line sectional explanatory drawing of (a). A- in FIG. 2 (a) in a state where a composite film in which a thermoplastic resin layer and a barrier layer are bonded instead of the thermoplastic resin layer is laminated on one side of the paper substrate with the thermoplastic resin layer as the innermost surface. It is A 'line sectional explanatory drawing. 3A in FIG. 3A in a state where a composite film in which a thermoplastic resin layer and a barrier layer are bonded instead of the thermoplastic resin layer is laminated on one side of the paper substrate with the thermoplastic resin layer as the innermost surface. It is A 'line sectional explanatory drawing. Instead of the thermoplastic resin layer, a paper sheet cup was obtained using a laminated sheet in which a composite film in which a thermoplastic resin layer and a barrier layer were bonded together was laminated on one side of a paper substrate with the thermoplastic resin layer as the innermost surface. It is AA 'line sectional explanatory drawing in (a). It is explanatory drawing of the edge protection resin layer adhesion | attachment jig | tool which bends and temporarily adheres the edge protection resin layer formed by protruding to one edge of a trunk | body member blank along a paper base material. It is a schematic explanatory drawing which shows each operation | movement which bends and temporarily adheres the edge protection resin layer formed by protruding to one edge of a trunk | body member blank along a paper base material. A plurality of blanks are arranged side by side on a roll-shaped paper base material, and a state in which a long window is formed in an outer portion including the edge at one edge of the blank is shown in FIG. (B) is an AA ′ line cross-sectional explanatory view of (a). 10A and 10B are diagrams illustrating a state in which a thermoplastic resin layer is laminated on one side of the paper substrate of FIG. 10, in which FIG. 10A is a plane explanatory view, and FIG. FIG. 11 is a cross-sectional explanatory view showing an example of a laminated sheet obtained by laminating a composite film in which a thermoplastic resin layer and a barrier layer are bonded to one side of the paper substrate of FIG. 10 so that the thermoplastic resin layer is inside. . One Example of the blank which formed the edge protection resin layer in one edge is shown, (a) is plane explanatory drawing, (b) is AA 'line cross-section explanatory drawing of (a). . One Example of the paper container of this invention is shown, (a) is a perspective explanatory drawing, (b) is the A-A 'sectional explanatory drawing of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Paper base material 2 ... Thermoplastic resin layer 2a ... Barrier layer 3 ... Laminated sheet 4 ... Edge protection resin layer 5 ... Paper base material end face 10 ... Body member blank 11 ... One edge The edge of the end face treated 12 ... The other edge, the edge of the end face not treated 13 ... Long window 14 ... Unnecessary portion of the body member blank 15 ... Body paste Alignment part 16 ... Edge part 20 ... Bottom member 21 ... Peripheral part 22 ... Annular leg part 31 ... Roll paper substrate 32 ... Blank 33 ... One edge 34 ... Long window D1 ... 1st member D11 ... Holding protrusion D12 ... Gap D2 ... 2nd member D21 ... Holding protrusion D3 ... 3rd member D31 ... Holding protrusion

Claims (2)

It is composed of a laminated sheet whose base material is paper with a thermoplastic resin layer provided at least on the inner surface. One end of the blank is overlapped with the other end to form a body-bonding portion. In the paper container in which the upper and lower openings of the body member are directly or folded and heat-sealed, the one end edge of the blank has the inner side thermoplastic resin layer as a paper base material. The edge protective resin layer is formed by protruding beyond a predetermined width, and the edge protective resin layer is folded outward in the vicinity of the end of the paper base to cover the end face of the paper base, and the other edge of the blank. The barrier layer is provided between the paper base material and the thermoplastic resin layer, and the edge protection resin layer of the blank is directed from the inner surface side to the outer surface side of the paper container. Press and bend it at an angle of approximately 90 ° with the first comb-shaped member, then press The bent edge protection resin layer is pushed and bent by the second comb-shaped member at an angle of approximately 90 ° from the outer side to the inner side of the paper container, and finally the bent edge protection resin layer is pushed to the outside of the paper container. A method for treating an end face of a paper container, wherein the comb-shaped third member is pressed from the direction toward the inner side to temporarily bond the edge protection resin layer to the end face of the blank paper base. It is composed of a laminated sheet based on paper with a thermoplastic resin layer provided at least on the inner surface, and one end of the body member blank is overlapped with the other end to form a body bonded part. A cylindrical body member, and a peripheral member of the substantially circular bottom paper is erected downward to form a bottom member. The inner surface of the peripheral member of the bottom member is joined to the lower inner surface of the body member, and the peripheral portion is covered. In the paper cup in which the lower end edge of the body member is bent inward, joined to the outer peripheral surface of the bottom member to form an annular leg, and the upper periphery of the body member is wound outward to form a mouth edge The one end edge of the body member blank of the body portion bonding portion has at least an inner surface side thermoplastic resin layer protruding from the paper base by a predetermined width to form an edge protection resin layer, and the edge protection resin layer Is folded near the edge of the paper substrate Material end face is coated, is in close contact with the inner surface of the other end edge with portions bonded body of the cylinder member blank form, is provided with a barrier layer between the paper substrate and the thermoplastic resin layer, The edge protecting resin layer of the body member blank is bent and bent at an angle of about 90 ° with a comb-shaped first member from the inner surface side to the outer surface side of the paper cup. The edge protection resin layer is pushed and bent by a second comb-like member at an angle of about 90 ° from the outer side to the inner side, and finally, the edge protection resin layer is comb-like from the outer side to the inner side. A method for treating an end face of a paper cup barrel member, wherein the third member is pressed to temporarily bond the edge protection resin layer to the end face of the paper base of the barrel member blank.

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