JP2007069936A - Paper laminated material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper laminated material which is superior in water resistance, strength, shape holding properties, various barrier properties, heat-welding properties, sealing properties and the like for a paper cup container storing ice cream, instant Chinese noodle, snack confectionery, etc., and for a paper container for a liquid for storing coffee, juice, various kinds of seasonings, Japanese sake, fruit wine, etc., and when respective inner face sealant layers are spot-likely heat-fused by heating with a hot air and respective key points are heat-pressed to mold them, has no possibility of generating a number of dome-like gaps especially between a paper material layer and an adhesive resin layer, and has no fear of generating interlaminar releasing and pinholes. <P>SOLUTION: The paper laminated material is provided with a number of air venting fine holes a, a and a on the outer face resin layer 2 of the paper laminated material for the paper cup container 20, the paper container 30 for the liquid or the like in which at least the outer resin layer 2, the paper material layer 3, a barrier layer 4 and an inner face sealant layer 5 are laminated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a thermocompression bonding by heating with hot air, such as a paper cup container 20 containing ice cream, instant ramen, snacks, etc., or a liquid paper container 30 containing coffee, juice, various seasonings, Japanese sake, fruit wine, etc. The present invention relates to a paper laminating material that is free from delamination and pinholes.

  Conventionally, each of a blank of a fan-shaped body surface plate b and a blank of a circular bottom plate c as shown in FIG. A cup-shaped paper cup container 20 having an inner volume of 100 to 2000 ml is generally widely used, where the inner surface sealant layer 5 is spot-heated with hot air to be melted hot, and a key portion is thermocompression bonded to open the upper surface. It has been.

  Further, conventionally, a top plate group d, d, d, d and side plates e, e made of a paper laminated material for containing coffee, juice, various seasonings, sake, fruit wine, etc., as shown in FIG. , e, e, the bottom plate group f, f, f, f and the heat-bonding pieces g, g, g are continuously connected to the inner surface sealant layer 5 with hot air in a spot manner. In general, a liquid paper container 30 having a rectangular parallelepiped shape with a gable roof shape and an inner volume of 200 to 3000 ml, which is formed by thermocompression bonding of the main points, is widely used.

As for the conventional paper laminated materials such as the paper cup container 20 shown in FIG. 2 and the liquid paper container 30 shown in FIG. 3, for example, 10-50 μm polyethylene (PE) having excellent water resistance as shown in FIG. 4A, etc. The outer surface resin layer 2, an appropriate paper material layer 3 of 100 to 550 g / m ² excellent in strength and shape retention, and 12 with inorganic oxide vapor deposition (SiO _x , AlO _x ) excellent in various barrier properties. A barrier layer 4 such as tough polyester (PET) of ˜25 μm and an inner surface sealant layer 5 such as low density polyethylene (LDPE) of 30 to 100 μm having excellent heat fusion and sealing properties,
Between the paper material layer 3 and the barrier layer 4, an adhesive resin layer 6 such as linear low density polyethylene (LLDPE) having excellent heat melting property and heat bonding property is heat-melted to form a film of 10 to 60 μm. And laminated (referred to as extrusion lamination) (or laminated via a urethane adhesive described later), and between the outer surface resin layer 2 and the paper material layer 3 and the barrier layer 4 The inner surface sealant layer 5 is laminated by an ordinary dry lamination method or the like (or outer surface resin layer) through a urethane adhesive (not shown) of about 5 g / m ² having excellent adhesive strength. 2, the inner surface sealant layer 5 was laminated by hot melt extrusion in the same manner as described above), and a paper laminated material having excellent water resistance, strength, shape retention, various barrier properties, heat fusion properties, sealing properties, etc. Generally used widely.

  However, the conventional paper laminated materials shown in FIG. 4A, such as the paper cup container 20 shown in FIG. 2 and the liquid paper container 30 shown in FIG. 3, have water resistance, strength, shape retention, various barrier properties, and heat fusion properties. , Which is a widely used paper laminate material with excellent sealing performance, etc., but each inner surface sealant layer 5 is spot-heated with hot air and melted, and each key point is subjected to thermocompression bonding. When molding into a cup shape with the upper surface open or a rectangular parallelepiped shape with the gable roof shape on the upper surface, the heat of hot air of about 300 ° C. is passed through the inner surface sealant layer 5, barrier layer 4, and adhesive resin layer 6. In order to reach the material layer 3 and heat the paper material layer 3 to some extent, 5 to 10% of the water contained in the paper material layer 3 is rapidly evaporated, as shown in FIG. 4B. Between the layer 2 and the paper material layer 3 and between the paper material layer 3 and the adhesive tree Between the layer 6, a large number of dome-like gap h, h, h, ... that occurs been a problem.

That is, in particular, a large number of dome-shaped gaps h, h, h,... Generated between the paper material layer 3 and the adhesive resin layer 6 are layers between the paper material layer 3 and the adhesive resin layer 6 (FIG. 4B). In the horizontal direction), delamination (referred to as delamination) occurs in the paper laminate material, and there is a risk of causing molding defects or liquid leakage of the paper cup container 20 or the liquid paper container 30.
Further, the top of the dome (lower part in FIG. 4B) of a large number of dome-shaped gaps h, h, h,... Generated between the paper material layer 3 and the adhesive resin layer 6 ruptures. There is a possibility that pinholes (called pinned pinholes) are generated in the barrier layer 4 of the laminated material, and various barrier properties (quality preservation) such as the paper cup container 20 and the liquid paper container 30 are lowered.

  Therefore, the object of the present invention is to provide water resistance such as a paper cup container 20 that contains ice cream, instant ramen, snacks, etc., and a liquid paper container 30 that contains coffee, juice, various seasonings, Japanese sake, fruit wine, and the like. It is a paper laminate material with excellent strength, shape retention, various barrier properties, heat-sealing properties, and sealing properties. Each inner sealant layer 5 is spot-heated with hot air and melted. A paper cup container in which a large number of dome-shaped gaps h, h, h,... Shown in FIG. 4B are not generated between the paper material layer 3 and the adhesive resin layer 6, especially when molding is performed by thermocompression bonding of key points. 20 or a liquid paper container 30 and the like.

  In JP-A-2004-42935 (liquid paper container) shown in Patent Document 1 mentioned above, the adhesive strength of the adhesive resin layer 6 is treated with ozone, particularly the lamination strength between the paper material layer 3 and the barrier layer 4. The paper laminate material of the present invention, which is significantly improved by the above and prevents the occurrence of delamination, pinholes, etc., is the invention of a liquid paper container with different means even if the problem and effect are the same. It is disclosed.

  The paper laminate material of the present invention includes a paper cup container 20 shown in FIG. 2 and a liquid paper container 30 shown in FIG. 3 in which at least the outer resin layer 2, the paper material layer 3, the barrier layer 4 and the inner sealant layer 5 are laminated. 1A and 1B, a paper laminated material having a plurality of ventilation pores a, a, a,... Provided on the outer surface resin layer 2 of the paper laminated material. It is.

In the paper laminated material of the present invention, the paper cup container 20 or the liquid paper container 30 in which at least the outer resin layer 2, the paper material layer 3, the barrier layer 4 and the inner sealant layer 5 are laminated, as in the conventional case described above. By providing a large number of ventilation pores a, a, a,... Shown in FIGS. 1A and 1B on the outer surface resin layer 2 of the paper laminate material,
When each inner surface sealant layer 5 is spot-heated with hot air and melted, and each point is thermocompression-bonded to form a cup shape with an open upper surface or a rectangular shape with a gable roof shape on the upper surface. As in the conventional case described above, the heat of hot air of about 300 ° C. reaches the paper material layer 3 via the inner surface sealant layer 5 and the barrier layer 4 (and the adhesive resin layer 6), and this paper material layer Even if 5 to 10% of the water contained in the paper material layer 3 is suddenly evaporated by heating 3 a little, the suddenly evaporated water is a large number of ventilation pores a provided in the outer surface resin layer 2. , a, a,... between the outer resin layer 2 and the paper material layer 3 and between the paper material layer 3 and the adhesive resin layer 6. A paper laminate material in which the gaps h, h, h,... Do not occur can be obtained.

That is, since many dome-shaped gaps h, h, h,... Do not occur between the paper material layer 3 and the adhesive resin layer 6, the gaps h, h, h,. And the adhesive resin layer 6, and there is no risk of delamination occurring in the paper laminate material, resulting in molding failure or liquid leakage of the paper cup container 20 or liquid paper container 30, and the top of the dome Ruptures and pinholes are generated in the barrier layer 4 of the paper laminate material, and various barrier properties such as the paper cup container 20 and the liquid paper container 30 are not deteriorated. A paper laminate material excellent in various barrier properties, heat-sealing properties, sealing properties, etc. can be obtained.

  In addition, the paper laminate material of the present invention includes a paper cup container 20 shown in FIG. 2 or a liquid paper container shown in FIG. 3 in which at least the outer resin layer 2, the paper material layer 3, the barrier layer 4, and the inner sealant layer 5 are laminated. A large number of air-permeable pores a, 30, etc. are formed on the outer surface resin layer 2 of the paper laminate material such as 30 that is heated and compressed by hot air indicated by hatching in FIG. is a paper laminate material provided with a, a,.

In the paper laminated material of the present invention, the paper cup container 20 or the liquid paper container 30 in which at least the outer resin layer 2, the paper material layer 3, the barrier layer 4 and the inner sealant layer 5 are laminated, as in the conventional case described above. The inner sealant layer 5 of the paper laminate material is spot-heated with hot air and thermocompression-bonded, the portion indicated by hatching in FIG. 3B and the heat of the hot air in the vicinity reach the paper material layer 3. By providing a large number of ventilation pores a, a, a,... Shown in FIG.
When each inner surface sealant layer 5 is spot-heated with hot air and melted, and each point is thermocompression-bonded to form a cup shape with an open upper surface or a rectangular shape with a gable roof shape on the upper surface. Like the paper laminated material shown in FIGS. 1A and 1B described above, a large number of papers shown in FIG. 4B are provided between the outer resin layer 2 and the paper material layer 3 and between the paper material layer 3 and the adhesive resin layer 6. A paper laminated material that does not generate dome-shaped gaps h, h, h,.. Since the resin layer 2 is not provided with a large number of ventilation pores a, a, a,... Shown in FIGS. 1A and 1B, there is no risk of impairing the water resistance and appearance of the paper cup container 20 and the liquid paper container 30. A paper laminate material can be obtained.

As described above, in the paper laminated material of the present invention, a paper cup container 20 that contains ice cream, instant ramen, snacks, etc., and a liquid paper container 30 that contains coffee, juice, various seasonings, Japanese sake, fruit wine, etc. A large number of ventilation pores a, a, a,... Are provided in the outer surface resin layer 2 of the paper laminate material that is excellent in water resistance, strength, shape retention, various barrier properties, heat-sealing properties, and sealing properties. By
Each inner surface sealant layer 5 is spot-heated with hot air to be melted by heat, and each material is heat-compressed to form the paper material layer 3 so that it is not a little heated and contained in the paper material layer 3. Even if 5 to 10% of the water is rapidly evaporated, the rapidly evaporated water is released from the large number of ventilation pores a, a, a,. Delamination (such as a paper cup container 20 or a liquid paper container 30) in which a large number of dome-shaped gaps h, h, h,... Shown in FIG. 4B do not occur between the paper material layer 3 and the adhesive resin layer 6 ( It is possible to provide a paper laminate material that is free from the occurrence of pinholes (called delamination) and pinholes (called twisted pinholes).

  In the paper laminated material of the present invention, the large number of ventilation pores a, a, a,... Provided in the outer surface resin layer 2 are, for example, extremely rough sandpaper as shown in FIG. A large number of ventilation holes a, a, a,... Of arbitrary shapes penetrating the outer surface resin layer 2 such as a needle hole shape with intervals are used by a rotating roll process using a diamond sand blade and a number of punching needles. In the punching process or the laser irradiation process using a carbon dioxide laser, the outer resin layer 2 in a state of being laminated on the paper material layer 3 can be provided without any particular limitation.

In addition, about the gas permeability of many ventilation pores a, a, a, ... provided in the outer surface resin layer 2, 100 ml of air compressed by a 567 g cylinder in the JIS P8117 Gurley air permeability measuring instrument The result of measuring the time for passing through the paper laminate material of 645 mm ² is 5S-2
Those between 000S are preferably used.

  FIG. 1A is a cross-sectional explanatory view of a paper laminate material in Example 1 of the present invention. 2A and 2B are a perspective view and a cross-sectional view of the paper cup container 20 according to the first embodiment of the present invention, and FIG. 2C is a plan view of a blank of the paper cup container 20.

That is, a 40 μm polyethylene (PE) outer surface resin layer 2 having excellent water resistance, and a paper material layer 3 of a 280 g / m ² cup base paper having excellent strength and shape retaining properties preliminarily printed on the surface. In the normal extrusion laminating process, the outer surface resin layer 2 is melted and extruded and laminated into a film shape, and then in a rotating roll process using a diamond sand blade, an extremely rough sandpaper-like shape shown in FIG. When a large number of ventilation pores a, a, a,... Which penetrate the outer surface resin layer 2 and reach the paper material layer 3 are provided, a large number of ventilation pores a, a, a,. The gas permeability of ... was 1800S on average according to JIS P8117 method.

Next, a paper laminate material in which the outer surface resin layer 2 and the paper material layer 3 are laminated and provided with a large number of ventilation pores a, a, a,..., And an inorganic oxide vapor deposition having excellent various barrier properties ( A barrier layer 4 of 12 μm tough polyester (PET) with AlO _x , 300 nm) and an inner sealant layer 5 of 60 μm low density polyethylene (LDPE) excellent in heat fusion and sealing,
Between the paper material layer 3 and the barrier layer 4 of the paper laminate material, an adhesive resin layer 6 of linear low density polyethylene (LLDPE) having excellent heat melting property and heat bonding property is heat-melted to form a 40 μm film. In the same manner, the inner sealant layer 5 is thermally melted into a film between the barrier layer 4 and the inner surface sealant layer 5 in the same manner as in the extrusion laminating process. The paper laminate material of Example 1 shown in FIG. 1A having excellent water resistance, strength, shape retention, various barrier properties, heat fusion properties, sealing properties, and the like was prepared by extrusion.

  Subsequently, in a punching process using a normal punching blade, the paper laminated material shown in FIG. 1A is cut, and a paper cup container comprising a fan-shaped body surface plate b and a circular bottom plate c shown in FIG. 2C. After producing 20 blanks, the inner sealant layer 5 of the blank of the fan-shaped body surface plate b and the blank of the circular bottom plate c is spot-formed in a normal cup molding process similar to the conventional one. Heated with hot air and melted, molded into a cup with the upper surface opened by thermocompression bonding, containing instant ramen to pour hot water into, and the internal capacity shown in FIGS. 2A and 2B is 300 ml A paper cup container 20 was prepared.

About the paper laminated material of Example 1 shown in FIG. 1A of the paper cup container 20 containing the instant ramen that is poured with hot water and tasted, in the normal cup molding process similar to the above-described conventional, with hot air of about 350 ° C. Although each inner surface sealant layer 5 was spot-heated and heat-melted, the key points were thermocompression-bonded and molded into a cup shape with the upper surface opened,
The heat of the hot air of about 350 ° C. reaches the paper material layer 3 through the inner surface sealant layer 5, the barrier layer 4, and the adhesive resin layer 6, and heats the paper material layer 3 to some extent. Even if 4.8% of the moisture contained in the material layer 3 is suddenly evaporated, this rapidly evaporated moisture is provided on the outer surface resin layer 2 and is an extremely rough sandpaper-like outer surface resin layer shown in FIG. 1A. Are discharged from a large number of ventilation pores a, a, a,... Passing through 2 and reaching the paper material layer 3, so that they are adhesive between the outer surface resin layer 2 and the paper material layer 3 and between the paper material layer 3 and the paper material layer 3. A paper laminate material in which a large number of dome-shaped gaps h, h, h,... Shown in FIG.
In particular, since many dome-shaped gaps h, h, h,... Do not occur between the paper material layer 3 and the adhesive resin layer 6, the gaps h, h, h,. And spreads between the layers with the conductive resin layer 6, and there is no risk of delamination occurring in the paper laminate material of the paper cup container 20, resulting in molding failure or liquid leakage, and the top of the dome is ruptured. Paper with excellent water resistance, strength, shape retention, various barrier properties, heat-sealing properties, sealing properties, etc., with no risk of pinholes occurring in the barrier layer 4 of the paper laminate material. A laminated material could be obtained.

  FIG. 1B is a cross-sectional explanatory view of a paper laminate material in Example 2 of the present invention. 3A is a perspective view of the liquid paper container 30 according to the second embodiment of the present invention, and FIG. 3B is a plan view of a blank of the liquid paper container 30. FIG.

That is, an outer resin layer 2 of 20 μm polyethylene (PE) having excellent water resistance, a paper material layer 3 of high-quality paper for liquid of 350 g / m ² having excellent strength and shape retention, and various barrier properties. 12 μm tough polyester (PET) barrier layer 4 with inorganic oxide vapor deposition (SiO _x , 400 nm), 60 μm low density polyethylene (LDPE) inner surface sealant layer 5 with excellent heat fusion and sealing The
The paper material layer 3 and the barrier layer 4 are laminated by a normal dry lamination method through a 5 g / m ² urethane adhesive (not shown) having excellent adhesive strength and the outer surface. Between the resin layer 2 and the paper material layer 3 and between the barrier layer 4 and the inner surface sealant layer 5, the outer surface resin layer 2 and the inner surface sealant layer 5 are respectively melted by heat in a normal extrusion lamination process. Extruded into a film and laminated to give excellent water resistance, strength, shape retention, various barrier properties, heat fusion properties, sealing properties, etc. (multiple ventilation pores a in FIG. 1B) , a, a,... were prepared.

Next, the paper laminate material shown in FIG. 1B is printed on the surface of the outer surface resin layer 2 that has been subjected to corona treatment in advance, and in a punching process using a normal punching die, the top plate groups d and d , d, d, side plate e, e, e, e, bottom plate group f, f, f, f and heat-sealing pieces g, g, g, connected in series, the liquid paper container shown in FIG. 3B Make 30 blanks,
At the same time, the inner surface sealant layer 5 of the blank of the liquid paper container 30 shown in FIG. 4 mm shown in FIG. 1B is formed on the outer surface resin layer 2 of a portion indicated by oblique lines heated and hot-compressed by hot air and a 12 mm wide portion indicated by a halftone dot where the heat of the hot air in the vicinity thereof reaches the paper material layer 3. A plurality of ventilation pores a, a, a,..., Penetrating the outer surface resin layer 2 and reaching the paper material layer 3 are provided in the outer surface resin layer 2. The gas permeability of the large number of ventilation pores a, a, a,... Was 1550S on average according to JIS P8117 method.

  Subsequently, in the same box-making and filling process of the liquid paper container as in the conventional case, the inner surface sealant layer 5 of the blank of the liquid paper container 30 shown in FIG. Then, it is melted and molded by thermocompression bonding of the key points. The length, width, and height of the container are 70 × 70 × 105 mm, and the upper surface shown in FIG. 3A is a rectangular parallelepiped liquid sheet. A container 30 was produced.

About the paper laminated material of the liquid paper container 30 containing 500 ml of orange juice of Example 2 shown in FIG. 1B (the outer surface resin layer 2 is provided with a large number of ventilation pores a, a, a,...) In the same process for making and filling a liquid paper container as described above, the inner surface sealant layer 5 is spot-heated and hot melted with hot air of about 320 ° C., and the upper surface is gabled by thermocompression bonding at important points. Despite being molded into a roof-shaped rectangular parallelepiped,
The heat of the hot air of about 320 ° C. reaches the paper material layer 3 through the inner surface sealant layer 5 and the barrier layer 4, and this paper material layer 3 is heated to some extent and contained in the paper material layer 3. Even if 6.2% of the water suddenly evaporates, the rapidly evaporated water is 0.5 mmφ at 4 mm intervals as shown in FIG. .. Are discharged from a large number of ventilation pores a, a, a,... Penetrating through the outer surface resin layer 2 and reaching the paper material layer 3, and thus between the outer surface resin layer 2 and the paper material layer 3. In addition, a large number of dome-shaped gaps h, h, h,... Shown in FIG. 4B do not occur between the paper material layer 3 and the adhesive resin layer 6, and delamination occurs in the paper laminate material of the liquid paper container 30. As a result, there is no risk of molding defects or liquid leakage, and pinholes are generated in the barrier layer 4 of the paper laminate material of the liquid paper container 30. Various such barrier property is not likely to deteriorate, it is possible to obtain water resistance and strength, shape retention, various barrier properties and heat sealing properties, a superior paper laminated materials such as sealability.

In addition, with respect to the paper laminate material of Example 2 shown in FIG. 1B, the portion indicated by the oblique lines of the blank of the liquid paper container 30 shown in FIG. And a 12 mm wide portion indicated by a halftone dot where the heat of the hot air in the vicinity reaches the paper material layer 3, the outer surface of the outer surface resin layer 2 having a needle hole shape of 0.5 mmφ at intervals of 4 mm shown in FIG. 1B By providing a large number of ventilation pores a, a, a,... Penetrating the resin layer 2 and reaching the paper material layer 3,
When the inner surface sealant layer 5 is spot-heated with hot air and melted, and the main part is thermocompression-bonded and formed into a rectangular parallelepiped shape with a gable roof shape, as described above, the outer surface resin layer 2 and paper A paper laminated material in which a large number of dome-shaped gaps h, h, h,... Shown in FIG. 4B are not generated between the material layer 3 and between the paper material layer 3 and the adhesive resin layer 6. 0.5 mmφ at intervals of 4 mm as shown in FIG. 1B on the outer surface resin layer 2 of 20 μm polyethylene (PE) having excellent water resistance in a portion where there is no possibility of generating a large number of dome-shaped gaps h, h, h,. Are not provided with a large number of ventilation pores a, a, a,... Which penetrate the outer surface resin layer 2 and reach the paper material layer 3, and thus a liquid paper container 30 containing 500 ml of orange juice. Thus, it was possible to obtain a paper laminate material that does not impair the water resistance and appearance.

FIGS. 1A and 1B in Example 1 and Example 2 of the present invention are cross-sectional explanatory views of respective paper laminate materials. 2A and 2B in the first embodiment of the present invention are a perspective view and a cross-sectional view of the paper cup container 20, and FIG. 2C is a plan view of a blank of the paper cup container 20. 3A in the second embodiment of the present invention is a perspective view of the liquid paper container 30, and FIG. 3B is a plan view of a blank of the liquid paper container 30. FIG. 4A and 4B are cross-sectional explanatory views of a conventional paper laminate material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Outer surface resin layer 3 ... Paper material layer 4 ... Barrier layer 5 ... Inner surface sealant layer 6 ... Adhesive resin layer 20 ... Paper cup container 30 ... Liquid paper container a ... Venting pore b ... Body surface board c ... Bottom board d ... Top Face plate group e… Side plate f… Bottom plate group g… Heat-bonded piece h… Dome-shaped gap Slanted line… Part heated and hot-compressed with hot air Halftone dot… Near part

Claims (1)

  A paper laminated material such as a paper cup container 20 and a liquid paper container 30 in which at least an outer resin layer 2, a paper material layer 3, a barrier layer 4 and an inner sealant layer 5 are laminated, and the outer resin layer 2 of the paper laminated material Are provided with a large number of ventilation pores a, a, a,.

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