JP2005132419A - Barrier type paper cup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a barrier type paper cup of which unevenness in the is eliminated by elaborating the shape of corners of the barrel member. <P>SOLUTION: The barrel member 14 is made by forming a barrel section seam part 13 by superposing one end edge 11 of a barrel paper 10 on the other end edge 12. A bottom member 17 is formed by erecting the peripheral edge section 16 of a bottom paper 15 downward. The lower internal surface of the barrel member is bonded to the internal surface of the peripheral edge section of the bottom member. In addition, an annular leg section 18 is formed by bending the lower end edge section of the barrel member inward and bonding it on the external surface of the peripheral edge section of the bottom member to form this paper cup. In the paper cup, the end edge on the internal side of the barrel section seam part 13 is formed in such a manner that the thermoplastic resin layer may squeeze out of a paper base material excepting the lower end edge section 21 which is bent inward. Then, the lower end edge section of the barrel member which is bent inward is constituted in such a manner that a laminate sheet 1 and the thermoplastic resin layer 1a squeezing out of the laminate sheet may be notched 5 excepting a section. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a barrier paper cup, and in particular, relates to a barrier 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 location where contents such as a liquid material come into contact.

  A paper cup with a good barrier property that is filled with a beverage such as juice and the upper opening is sealed with a lid is made from, for example, polyethylene / paper / polyethylene / aluminum foil / polyethylene terephthalate film / polyethylene. In general, it is formed from 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 skive hemming process on the paper end surface, it is necessary to perform the 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 yield.

As a method for producing a barrier paper cup without performing skive hemming, a method for producing a paper cup from a blank whose end face is covered with a film has been proposed (see, for example, Patent Document 1).
However, in this barrier paper cup, the inner edge of the body-bonding portion is entirely formed by the thermoplastic resin layer protruding from the paper base material. In particular, the inner surface of the periphery of the bottom member is joined to the lower inner surface of the body member, and the lower end edge of the body member is folded inward to cover the periphery, and joined to the outer surface of the periphery of the bottom member. When forming the legs, the thermoplastic resin layer that protrudes from the paper base material becomes irregular due to heat, pressure, etc. due to bottom molding, leakage due to adhesion abnormality, and the appearance is unsatisfactory in appearance. There is a problem.

  The present invention has been made in view of the above-described problems relating to the barrier paper cup in which the inner edge of the body bonding portion is formed so that the thermoplastic resin layer protrudes from the paper base. It is an object of the present invention to provide a barrier paper cup that eliminates molding unevenness by devising the shape of a corner of a member.

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 at least on the inner surface side, and one end of the linerboard is overlapped with the other end. Forming a cylinder bonded portion to form a cylindrical body member, and forming a substantially circular bottom sheet with the peripheral edge 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 in which the lip portion is formed, the inner edge of the body bonding portion is formed so that the thermoplastic resin layer protrudes from the paper base except the lower edge that is bent inward, and inwardly. The bottom edge of the body member that is bent And a barrier paper cup, wherein the thermoplastic resin layer is cut extend beyond the laminated sheet.

  Thus, according to the first aspect of the present invention, the inner edge of the body bonded portion is formed so that the thermoplastic resin layer protrudes from the paper substrate except for the lower edge that is bent inward. The lower end edge of the body member that is bent inward is cut off the laminated sheet and the thermoplastic resin layer protruding from the laminated sheet except for a part, so that the lower end edge that is bent inward when forming the annular leg portion Since the part has been deleted and only four layers are required to be joined, there is no molding unevenness and beautiful molding becomes possible.

  The invention according to claim 2 is the invention according to claim 1, wherein the notch provided in the lower end edge of the body member that is bent inwardly adds the thickness of the laminated sheet to the start part of the body bonding part. It is a barrier paper cup characterized by being from the added site to the end portion of the body member.

  Thus, according to invention of Claim 2, the notch provided in the lower end edge part of the trunk | drum member bent inward is from the site | part which added the thickness of the lamination sheet to the start part of the trunk | drum bonding part. Since it is up to the end portion of the body member, there is no excess laminated sheet or thermoplastic resin layer in the annular leg portion, and a beautiful molding becomes possible.

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the thermoplastic resin layer formed on the inner surface of the laminated sheet has a three-layer structure of polyethylene / barrier layer / polyethylene. It is a barrier paper cup.

  Thus, according to the invention described in claim 3, the thermoplastic resin layer formed on the inner surface of the laminated sheet has a three-layer structure of polyethylene / barrier layer / polyethylene, thereby producing a paper cup having excellent barrier properties. it can.

  A fourth aspect of the present invention is a barrier paper cup according to the first, second or third aspect, wherein the barrier layer is an inorganic compound-deposited polyethylene terephthalate film.

  Thus, according to the invention of claim 4, since the barrier layer is an inorganic compound-deposited polyethylene terephthalate film, excellent oxygen barrier properties can be imparted.

  The invention of claim 5 is the invention of claim 1, 2, 3 or 4, wherein the barrier layer comprises a film containing a water-soluble resin and an inorganic layered compound, or a metal alkoxide or a hydrolyzate thereof and an isocyanate compound. A barrier paper cup characterized by being a resin layer provided with a reacted film.

  Thus, according to the invention of claim 5, the barrier layer is a resin layer provided with a film containing a water-soluble resin and an inorganic layered compound, or a film obtained by reacting a metal alkoxide or a hydrolyzate thereof with an isocyanate compound. Therefore, there is no need to laminate a film, and a barrier function can be added by coating.

  Thus, in the barrier paper cup of the present invention, the lower end portion of the inwardly folded body member is cut out of the laminated sheet and the thermoplastic resin layer protruding from the laminated sheet except for a part thereof. Stable bottom molding is possible even in the laminated part of the overlapping bottom parts, and it has become possible to produce a barrier paper cup with a stable shape and good appearance.

  The barrier paper cup of the present invention will be described in detail below based on one embodiment.

  For example, as shown in FIGS. 1, 2 and 3, the barrier paper cup of the present invention overlaps one end (11) of a fan-shaped liner (10) on the other end (12). In addition, a cylindrical body member (14) tapering downward is formed by forming a body bonded portion (13), and a bottom portion of a substantially circular bottom paper (15) is erected downward with a peripheral edge portion (16) facing downward. The lower end edge of the body member is bent inward and joined to the outer peripheral surface of the bottom member to form an annular leg (18). 19) is a barrier paper cup (20).

  And the inner edge of the body bonding part (13) forming the paper cup is formed with the thermoplastic resin layer protruding beyond the paper substrate except for the lower edge (21) bent inward. The thermoplastic resin layer (1a) formed by protruding from the paper base of the laminated sheet is heated to the thermoplastic resin layer (2) at the other end so that the end face of the paper base is not exposed. It is fused.

  Further, the lower end edge portion of the body member bent inward to form the annular leg portion (18) is cut out of the laminated sheet and the thermoplastic resin layer formed by protruding from the laminated sheet except for a part thereof. It has been.

  This will be described in an easy-to-understand manner with reference to FIG.

  One end edge of the paperboard (10) is formed such that the thermoplastic resin layer (2) protrudes from the paper base (3) by a certain length (approximately 3 to 7 mm).

  The lower edge of the thermoplastic resin layer (1a) formed so as to protrude from the paper base material of the liner paper has a lamination width (W) required for forming the cylinder member and the thickness of the laminated sheet. The width (L) is reduced, and the length (L) of the lower edge (21) bent inward is cut out to form a cutout (5).

  By using such a shape of the paperboard, when the paper cup is formed, the body bonding portion of the annular leg portion is a joining of four sheets as shown in FIG. Since there is no thermoplastic resin layer (1a) formed so as to protrude from the material, the molded state is stabilized, the pressure unevenness is reduced, and an annular leg portion having a stable shape and good appearance can be molded.

  FIG. 5 is an explanatory cross-sectional view showing a body bonding portion of an annular leg portion of a conventional barrier paper cup, which is a joining of five sheets.

  The thermoplastic resin layer (2) formed on the inner surface of the laminated sheet (1) preferably has, for example, a three-layer structure of polyethylene / barrier layer / polyethylene, which improves the barrier properties.

The barrier layer is formed by depositing a thin film of an inorganic compound such as aluminum oxide or silicon oxide on a stretched film such as a uniaxially or biaxially stretched polyethylene terephthalate film, polyamide film or polyolefin film by a vapor deposition method such as physical vapor deposition or chemical vapor deposition. An inorganic compound vapor-deposited plastic film having a thickness of about ˜100 nm can be used. Among these, a deposited film obtained by depositing a thin film of an inorganic compound on a polyethylene terephthalate film can be more preferably used.

  Further, when the barrier layer is a resin layer provided with a film containing a water-soluble resin and an inorganic layered compound, or a film obtained by reacting a metal alkoxide or its hydrolyzate with an isocyanate compound, the adhesion to polyethylene is further improved. To do.

  Moreover, you may provide a polyethylene resin layer in the outer surface of a paper base material as needed. By providing a polyethylene resin layer on the outer surface of the paper substrate, the adhesion between the body member and the body member, or between the body member and the bottom member is further improved, and a barrier paper cup with better sealing and barrier properties is obtained. Can do.

  A barrier paper cup is produced from the produced paper and bottom paper using a generally known paper cup molding machine.

  The paperboard is not limited to a fan shape, and may be, for example, a rectangular shape or a square shape. In this case, a cylindrical paper cup having substantially the same diameter at the top and bottom as shown in FIG. 4 can be formed.

  In addition, the upper peripheral edge of the trunk member may be wound outwardly to form a lip edge. For example, a substantially circular cover paper is formed by raising the peripheral edge upward, and the upper inner side of the trunk member. The inner surface of the periphery of the lid member is joined to the cover member, and the upper periphery of the body member is folded inward so as to cover the periphery, and the body member and the cover member are hermetically sealed by joining to the outer surface of the periphery of the cover member. A cylindrical paper container may be used.

It is model process explanatory drawing which shows an example of the preparation procedures of the barrier paper cup of this invention. An example of the barrier paper cup of the present invention is shown, (a) is a partial sectional explanatory view, (b) is an enlarged view of A part of (a), and (c) is B part of (a). It is expansion explanatory drawing, (d) is an expansion explanatory drawing of the C section of (a). It is expansion explanatory drawing of the trunk member notch part of the barrier paper cup of this invention. The another Example of the barrier paper cup of this invention is shown, (a) is a perspective explanatory drawing, (b) is the A section enlarged explanatory drawing of (a), (c) is the B section of (a). It is expansion explanatory drawing, (d) is an expansion explanatory drawing of the C section of (a). It is a partial cross-section expansion explanatory drawing of the trunk | drum bonding part of the cyclic | annular leg part of the conventional barrier paper cup.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Laminated sheet 1a ... Thermoplastic resin layer which protrudes from the paper base material of laminated sheet 2 ... Thermoplastic resin layer 3 ... Base material, paper 5 ... Notch 10 ... Body paper 11 ... One edge 12 ... The other edge 13 ... Body bonding part 14 ... Body member 15 ... Bottom paper 16 ... Peripheral part 17 ... Bottom member 18 ... Annular leg 19 ... Mouth Edge 20 ... Barrier paper cup 21 ... Bottom edge that can be folded inward

Claims (5)

It is composed of a laminated sheet whose base material is paper provided with a thermoplastic resin layer on at least the inner surface,
One end of the paperboard is overlapped with the other edge to form a body-bonded portion to form a cylindrical body member, and the bottom member of the substantially circular bottom paper is erected downward at the peripheral edge The inner surface of the peripheral part of the bottom member is joined to the inner surface of the lower part of the body member, and the lower end edge of the body member is bent inward so as to cover the peripheral part and joined to the outer surface of the peripheral part of the bottom member. In the paper cup in which the legs are formed and the upper peripheral edge of the trunk member is wound outward to form the mouth edge,
The inner edge of the body bonded portion is formed by protruding the thermoplastic resin layer from the paper substrate except for the lower edge that is bent inward,
A barrier paper cup, wherein a lower end edge portion of a body member bent inward is cut out of a laminated sheet and a thermoplastic resin layer protruding from the laminated sheet except for a part thereof.   The notch provided in the lower end edge of the body member folded inward is from a portion obtained by adding the thickness of the laminated sheet to the start portion of the body bonding portion to the end portion of the body member. The barrier paper cup according to claim 1.   The barrier paper cup according to claim 1 or 2, wherein the thermoplastic resin layer formed on the inner surface of the laminated sheet has a three-layer structure of polyethylene / barrier layer / polyethylene.   The barrier paper cup according to claim 1, 2, or 3, wherein the barrier layer is an inorganic compound-deposited polyethylene terephthalate film.   The barrier layer is a resin layer provided with a film containing a water-soluble resin and an inorganic stratiform compound, or a film obtained by reacting a metal alkoxide or a hydrolyzate thereof with an isocyanate compound. The barrier paper cup according to 3 or 4.

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