TW201831378A - Paper container and barrel member blank - Google Patents

Abstract

In order to provide a paper container and a barrel member blank which have a simple configuration and low cost, and reliably prevent the leakage of contents through a gap region, this barrel member (20) has a first barrel member end section (22) disposed on a side proximal to a bottom member side wall (32) of a bottom member (30) in a side seal part (21); and a second barrel member end section (23) disposed on a distal side. In this paper container (10), a gap region (A) is formed between the bottom member side wall (32), and the first barrel member end section (22) and the second barrel member end section (23), and when seen in a cross-sectional view from at least one position in the direction in which the gap region (A) extends, the gap region (A) is fully filled with a resin cladding (40).

Description

 Paper container and cylindrical blank  

The present invention relates to a paper container and a cylindrical material obtained by laminating a polyester resin to a laminate obtained by laminating a cylindrical material and a cylindrical material formed into a cup shape.

In recent years, from the viewpoint of the environmental load, a paper-formed body which is a main body of paper having a circulating type of material has been attracting attention, and as a paper-formed body, a synthetic resin is laminated on a paper and laminated. A paper container in which a cylindrical body is formed into a cylindrical shape and a substrate formed into a cup shape is widely used for containers for foods and drinks.

As shown in FIG. 4, in the paper container, a step portion is formed on the side of the side seal portion 121 in which the both end portions 122 and 123 of the cylindrical member 120 in the circumferential direction are overlapped, and thus a step portion is formed. On the side of the side seal portion 121, a gap region A having a triangular cross section is formed between the substrate side wall 132 of the substrate 130 and the cylindrical member 120.

Here, in the case where the laminate layers 120b and 130b formed on the paper surface contain a polyethylene resin having a melting point of about 110 ° C and high fluidity upon heating, the laminate layers 120 b and 130 b are heated by the container formation. Further, since the gap region A is filled with the molten polyethylene resin, the existence of such a gap region A does not pose a problem.

However, in recent years, paper containers have gradually become heat-resistant containers for use in baking or Doria, which are heated and regulated by an oven or the like. In this case, PET having a melting point of up to about 260 ° C is used. A polyester resin such as polyethylene terephthalate) is used as the laminate layers 120b and 130b.

This polyester-based resin is excellent in heat resistance, but has low fluidity during heating. Therefore, when the laminate layers 120b and 130b are formed of a polyester-based resin, it is not expected to be laminated by heat during container formation. 120b, 130b melt and fill the function of the gap area A.

Further, in the case where the gap region A is not filled, there is a problem in that the contents of the paper container leak along the gap region A, and thus it is difficult to expand the use of a food having a high permeability.

 [Previous Technical Literature]    [Patent Literature]  

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2015-226863

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2014-141282

Therefore, as a solution to the problem as described above, it is proposed to use a low melting point resin layer having a lower melting point between a paper and a laminate layer containing a polyester resin to utilize a heat at the time of forming the container to lower the melting point. The resin layer is melted, thereby filling the gap region A (see Patent Document 1).

However, in the paper container described in Patent Document 1, it is necessary to additionally form a low-melting-point resin layer. Therefore, not only the manufacturing cost is increased, but also the low-melting-point resin layer is formed on the inner side of the polyester-based resin, so that it is low. The molten state of the melting point resin layer tends to be uneven, and it is difficult to control the flow well.

Further, as another solution, it is also proposed that the edge of one end of the cylindrical blank is formed into a tip shape by performing a shear hemming process on one end edge of the cylindrical blank in the circumferential direction. Further, the outer peripheral edge of the one end edge of the cylindrical material blank of the tip shape is followed by the side wall of the substrate, thereby avoiding the formation of the gap region A (refer to Patent Document 2).

However, in the paper container described in Patent Document 2, since the edge of one of the cylindrical blanks is subjected to the cutting and hemming processing with high processing difficulty, not only the manufacturing cost is increased, but also the following problem is obtained: the cylindrical material is easy to be used. The shape of one end edge of the blank is uneven, and it is difficult to avoid the formation of the gap region A well.

Accordingly, the present invention solves such problems, and an object thereof is to provide a paper container and a cylindrical blank which reliably prevent leakage of contents through a gap region with a simple configuration and at low cost.

The paper container of the present invention comprises a laminate in which a polyester resin is laminated on paper, and a cylindrical material which is bonded to a cylindrical shape and a substrate formed into a cup shape are formed, and the cylindrical material has The first cylindrical member end portion disposed on the side closer to the substrate side wall of the substrate and the second cylindrical member end portion disposed on the side of the substrate in the side seal portion on the substrate side wall and the first portion A gap region is formed between the end portion of the cylindrical member and the end portion of the second cylindrical member, and when the cross-sectional view is performed at at least one portion in the extending direction of the gap region, the gap region is filled with a resin filler. This solves the above problems.

The cylindrical material blank of the present invention comprises a cylindrical material blank for a paper container in which a polyester resin is laminated on paper, and the cylindrical material blank is disposed on a side of the side seal portion near the side wall of the substrate. The first cylindrical material end portion and the second cylindrical material end portion disposed on the far side, and the second circle disposed on the side wall side of the substrate next to the side wall of the substrate The inner surface of the end portion of the tubular material has a resin filler, thereby solving the above problems.

According to the inventions of claim 1 and 2, the cylindrical member has the first cylindrical member end portion disposed on the side of the side wall side of the substrate in the side seal portion, and the second cylinder disposed on the far side. The material end portion has a gap region formed between the side wall of the substrate, the end portion of the first cylindrical member, and the end portion of the second cylindrical member, and the gap is observed when at least one portion of the gap region extends in a cross section. The area is filled with a resin filler, whereby the contents of the paper container can be reliably prevented from leaking from the gap region with a simple configuration and low cost.

In the case where the resin filler is a spray forming portion provided on the inner surface of the second cylindrical material end portion disposed on the side wall side of the substrate, the cylindrical material is formed into a cylindrical front cylinder. In the state of the material blank, the resin filler is previously melted to a predetermined portion of the inner surface of the end portion of the second cylindrical member, and then the substrate is attached to the lower side of the cylindrical material formed into a cylindrical shape, and the cylindrical member and the cylindrical member are The substrate is heated, followed by a usual forming step of crimping the cylindrical member and the substrate, whereby the resin filler is melted, and the gap region is filled with the resin filler. Therefore, it is not necessary to perform processing for processing the edge of the cylindrical blank, and the processing is expensive, and the manufacturing cost is increased, and the resin filler provided on the inner surface of the end portion of the second cylindrical member can be freely designed. The amount, range, material, etc., so that the gap region can be filled reliably and at low cost.

According to the invention of claims 3 and 5, the resin filler contains a polyester resin or a resin containing a polyester resin, thereby suppressing heat applied when the side seal portion is formed or when the cylindrical member is followed by the substrate. The resin causing the resin filler is burned through or the position of the resin filler is changed, so that the gap region can be surely filled at a desired position.

According to the invention of claim 4, the resin filler contains a polyester resin having a melting point lower than that of the polyester resin laminated on the paper or the same melting point, which can be applied by pressing the substrate against the substrate. The heat causes the resin filler to be surely melted, thereby filling the gap region without a gap.

According to the invention of claim 6, the required manufacturing precision can be suppressed by interposing one of the resin fillers between the first cylindrical material end portion and the opposing surface of the second cylindrical material end portion. . In other words, when the side seal portion is formed on the inner surface of the end portion of the second cylindrical member, a resin filler is also provided at a position sandwiched between the end portion of the first cylindrical member and the end portion of the second cylindrical member, even if When the first cylindrical member end portion and the second cylindrical member end portion overlap each other, when the positional relationship between the first cylindrical member end portion and the second cylindrical member end portion in the circumferential direction is slightly shifted, The gap area is surely filled by the resin filler, so that the required manufacturing precision can be suppressed low.

According to the invention of claim 7, the resin filler is placed on the outer peripheral side of the substrate side wall in the gap region, so that the gap region can be filled in the vicinity of the entrance of the gap portion of the paper container facing the contents accommodating portion side. The contents are surely prevented from infiltrating into the gap region.

According to the invention of claim 8, the cylindrical material blank has the first cylindrical member end portion disposed on the side closer to the side wall of the substrate in the side seal portion, and the second cylindrical member end disposed on the far side. And a resin filler is provided on the inner surface of the end portion of the second cylindrical member disposed on the side wall side of the substrate next to the side wall of the substrate, whereby the substrate is attached to the cylindrical material formed into a cylindrical shape. On the lower side, the cylindrical material and the substrate are heated, and then a usual forming step of pressing the cylindrical material and the substrate is performed, whereby the resin filler is melted, and the gap region is filled with the resin filler. Therefore, it is not necessary to perform processing for processing the edge of the cylindrical blank, and the processing is expensive, and the manufacturing cost is increased, and the resin filler provided on the inner surface of the end portion of the second cylindrical member can be freely designed. The amount, range, material, etc., so that the gap region can be filled reliably and at low cost.

10‧‧‧paper containers

10a‧‧‧Receiving Department

20, 120‧‧‧Cylinder

20a, 30a‧‧‧ substrate layer (paper)

20b, 30b, 120b, 130b‧‧‧ laminated layer (polyester resin)

21, 121‧‧‧ side seals

22‧‧‧1st cylindrical end

23‧‧‧2nd cylindrical end

24‧‧‧ bottom side

24a‧‧‧outer side ring

24b‧‧‧ inner circumference side ring

25‧‧‧Cylinder blank

30, 130‧‧‧ substrate

31‧‧‧Bottom wall

32, 132‧‧‧ substrate side wall

40‧‧‧Resin filler

122, 123‧‧‧ end

A‧‧‧ gap area

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a paper container according to an embodiment of the present invention.

Fig. 2 is an explanatory view showing a cross-sectional view taken along the line II-II of Fig. 1 in the direction of the arrow.

Fig. 3 is a plan view showing a cylindrical blank.

Fig. 4 is an explanatory view showing a vicinity of a side seal portion of a conventional paper container.

Hereinafter, a paper container 10 according to an embodiment of the present invention will be described based on the drawings.

First, as shown in FIG. 1, the paper container 10 is constituted by a substrate 30 formed into a cup shape on the lower side of the cylindrical cylindrical member 20.

As shown in Fig. 2, the cylindrical member 20 and the substrate 30 are each formed of a laminate, and the laminate system is provided with a laminate layer 20b, 30b containing a polyester resin on the surface of the base material layers 20a and 30a including the paper. . Each of the laminate layers 20b and 30b is formed on one surface of each of the base material layers 20a and 30a on the side of the paper container 10 facing the content storage unit 10a.

As shown in FIG. 1 or FIG. 2, the cylindrical member 20 has a side seal portion 21 in which both ends of the circumferential direction are bonded, and the first seal portion 21 is disposed on the side closer to the side of the substrate side wall 32. The material end portion 22 and the side seal portion 21 are disposed on the second cylindrical material end portion 23 on the side away from the substrate side wall 32, and as shown in FIG. 2, a portion of the first cylindrical material end portion 22 is formed. The (front end portion) and one portion (front end portion) of the second cylindrical material end portion 23 are thermally formed to be formed into a tubular shape.

Further, as shown in FIG. 1, the cylindrical member 20 has a bottom side follower portion 24 attached to the bottom side wall 32 on the lower side thereof, and the bottom side connecting portion 24 has an outer peripheral side annular portion 24a which is disposed at the bottom. The outer peripheral side annular portion 24b and the inner peripheral side annular portion 24b are continuously formed at the lower end of the outer peripheral side annular portion 24a, and are disposed on the inner peripheral side of the substrate side wall 32.

As shown in FIG. 1, the substrate 30 has a disk-shaped bottom wall 31 and an annular substrate side wall 32 depending from the peripheral edge portion of the bottom wall 31.

Next, the resin filler 40 which is a characteristic part of the present invention will be described below.

First, the resin filler 40 contains a polyester resin, and as shown in FIG. 2, the substrate side wall 32, the first cylindrical material end portion 22, and the second cylindrical material end portion are packed on the outer peripheral side of the substrate side wall 32. 23 is a gap region A of a substantially triangular cross section.

Specifically, first, the gap region A continuously extends in the vertical direction across the outer peripheral side and the inner peripheral side of the substrate side wall 32. Then, as shown in FIG. 2, when at least one portion in the extending direction (up-and-down direction) of the gap region A is cross-sectionally observed, the gap region A is filled with the resin filler 40, and in the present embodiment, at the bottom The resin filler 40 is filled in such a manner as to fill the gap region A at the outer peripheral side of the material side wall 32 and near the upper end of the substrate side wall 32.

In the explanatory diagram shown in FIG. 2, the inner peripheral side of the substrate side wall 32 is omitted, that is, the inner peripheral side of the cylindrical member 20 disposed on the inner peripheral side of the substrate side wall 32 is omitted. Illustration of the portion 24b.

Further, as shown in FIG. 2, one of the resin fillers 40 is interposed between the opposing faces of the first cylindrical end portion 22 and the second cylindrical end portion 23.

Further, as described in detail below, the resin filler 40 is formed as a second portion disposed on the side of the substrate side wall 32 in the state of the cylindrical blank 25 in the form of a spray forming portion provided as follows. The inner surface of the cylindrical end portion 23 (more specifically, the laminated layer 20b on the inner surface side of the second cylindrical end portion 23) is sprayed with a powdery synthetic resin (polyester resin). .

Next, a method of manufacturing the paper container 10 of the present embodiment will be described below.

First, as shown in FIG. 3, in the state of the cylindrical blank 25, the powdery synthetic resin (polyester) is sprayed on the inner surface of the second cylindrical end portion 23 disposed on the side of the substrate side wall 32. Resin), thereby partially forming the resin filler 40.

Further, when the method of forming the resin filler 40 is more specifically described, in the present embodiment, the laminate layer 20b on which the inner surface of the second cylindrical member end portion 23 of the resin filler 40 is formed is preliminarily After heating to the vicinity of the melting point, the powdery synthetic resin is pressure-fed by a pressurized gas, and the heated gas (hot air) is merged to be sprayed intermittently or continuously.

Further, when the position at which the resin filler 40 is formed is more specifically described, as shown in FIG. 3, the resin filler 40 is formed on the inner surface of the second cylindrical member end portion 23 and overlaps the first cylinder. The position of the boundary portion between the portion of the material end portion 22 and the portion that does not overlap the first cylindrical material end portion 22.

Next, after the second cylindrical material end portion 23 is heated to melt the laminated layer 20b of the second cylindrical material end portion 23, one portion (front end portion) of the first cylindrical material end portion 22 and the second circle are formed. One portion (front end portion) of the tubular end portion 23 is overlapped and pressure-bonded, whereby the side seal portion 21 is formed, and the cylindrical blank 25 is formed into a tubular shape.

At this time, as shown in FIG. 2, the first cylindrical member end portion 22 is interposed between the first cylindrical member end portion 22 and the second cylindrical member end portion 23 with a portion of the resin filler 40 interposed therebetween. The second cylindrical end portions 23 overlap.

Next, as shown in Fig. 1, a cup-shaped substrate 30 is attached under the cylindrical cylindrical member 20, and the cylindrical member 20 and the substrate 30 are heated, and then the substrate 30 is crimped to the cylinder. Material 20.

At this time, the resin filler 40 is melted by the heat when the substrate 30 is pressed against the cylindrical member 20, and as shown in FIG. 2, when the cross-sectional observation is performed near the upper end of the substrate side wall 32, The gap region A is filled with the resin filler 40.

The embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described above, and various design changes can be made without departing from the invention described in the claims.

For example, the specific type of the polyester-based resin constituting the laminate layers 20b and 30b may be any polyester-based resin as long as it has easy adhesion to paper or heat resistance, and for example, PET (polyterephthalic acid) Ethylene glycol).

Moreover, in the above-described embodiment, the case where the resin filler 40 contains a polyester resin such as PET (polyethylene terephthalate) has been described, but the specific material of the resin filler 40 is not limited thereto. For example, the resin filler 40 may be formed of a resin containing a polyester resin.

Moreover, it is preferable that the resin filler 40 is formed of a polyester resin having a lower melting point than the polyester resin constituting the laminate layers 20b and 30b or the same melting point.

Further, in the above-described embodiment, in the state of the cylindrical blank 25, the powdery synthetic resin is sprayed on the inner surface of the second cylindrical end portion 23 to form the resin filler 40. However, the method of forming the resin filler 40 is not limited to the above method. For example, it may be within the second cylindrical end portion 23 by a hot melt gun, a hot runner unit, an injection unit, a 3D printer, or the like. A resin filler 40 is formed on the surface. Further, the resin filler 40 may be formed by thermocompression bonding or insert molding of a synthetic resin film or a molded member cut into a predetermined shape.

Further, in the case where the resin filler 40 is formed by spraying a powdery synthetic resin, the powder of the synthetic resin to be melted may be a synthetic resin before solid phase polymerization or solid phase polymerization, but preferably. It is a synthetic resin before solid phase polymerization with lower crystallinity.

Further, in the above-described embodiment, the resin filler 40 is partially provided on the outer peripheral side of the substrate side wall 32 in the gap region A which extends in the vertical direction across the outer peripheral side and the inner peripheral side of the substrate side wall 32, and the substrate side wall The situation near the upper end of 32 is explained. However, the position and range of formation of the resin filler 40 are not limited to the above. For example, the resin filler 40 may be provided in one portion of the inner peripheral side of the substrate side wall 32 in the gap region A, or may be spanned throughout. The resin filler 40 is provided in the gap region A.

Further, in the above embodiment, a part of the resin filler 40 is interposed between the opposing faces of the first cylindrical end portion 22 and the second cylindrical end portion 23, that is, when the side seal portion 21 is formed. The first cylindrical member end portion 22 and the second cylindrical member end are interposed between the first cylindrical member end portion 22 and the second cylindrical member end portion 23 with one portion of the resin filler 40 interposed therebetween. Although the portion 23 is superimposed and heat is applied, it is not essential that one portion of the resin filler 40 is interposed between the opposing faces of the first cylindrical end portion 22 and the second cylindrical end portion 23. In other words, in the state of the cylindrical blank 25, only the portion overlapping the first cylindrical member end portion 22 and the first cylindrical member may be adjacent to the inner surface of the second cylindrical member end portion 23. The portion where the end portions 22 overlap forms the resin filler 40.

Further, in the above-described embodiment, the case where the cylindrical member 20 and the substrate 30 are formed of the laminate layers 20b and 30b provided on the base material layers 20a and 30a has been described, but the cylindrical member 20 is formed. The specific aspect of the laminate of the substrate 30 is not limited to the above-described aspect. For example, a printing layer or the same layer may be formed on one surface of the substrate layers 20a and 30a opposite to the laminate layers 20b and 30b. Laminated layer, etc.

Further, in the above-described embodiment, the case where the bottom side connecting portion 24 of the cylindrical member 20 has the outer circumferential side annular portion 24a and the inner circumferential side annular portion 24b has been described, but the inner circumferential side annular portion may not be formed. The bottom side connecting portion 24 is constituted only by the outer peripheral side annular portion 24a.

Claims (8)

 A paper container comprising a laminate obtained by laminating a polyester resin on paper, and a cylindrical material laminated to a cylindrical shape and a substrate formed into a cup shape, wherein the above-mentioned paper container is characterized in that: The cylindrical member has a first cylindrical member end portion disposed on a side closer to the substrate side wall of the substrate, and a second cylindrical member end portion disposed on the far side of the substrate, on the side wall of the substrate a gap region is formed between the end portion of the first cylindrical member and the end portion of the second cylindrical member, and the gap region is filled when at least one portion of the gap region extends in a cross-sectional view. Resin filler.    The paper container according to claim 1, wherein the resin filler is a spray forming portion provided on an inner surface of the end portion of the second cylindrical member disposed to face the side wall side of the substrate.    The paper container of claim 1, wherein the resin filler comprises a polyester resin.    The paper container according to claim 3, wherein the resin filler comprises a polyester resin having a lower melting point or a melting point than the polyester resin laminated on the paper.    The paper container of claim 1, wherein the resin filler comprises a resin containing a polyester resin.    The paper container according to claim 1, wherein one of the resin fillers is interposed between the opposing faces of the first cylindrical material end portion and the second cylindrical material end portion.    The paper container according to claim 1, wherein the resin filler is provided on the outer peripheral side of the side wall of the substrate in the gap region.    A cylindrical material blank comprising a cylindrical material for a paper container in which a polyester resin is laminated on a paper, wherein the cylindrical blank has a side seal portion disposed near the bottom The first cylindrical end portion on the side of the material side wall and the second cylindrical material end portion disposed on the far side, and disposed on the side wall side of the substrate next to the side wall of the substrate The inner surface of the end portion of the second cylindrical member has a resin filler.