JP2018131210A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a standing type packaging bag excellent in both heat sealability and air permeability.SOLUTION: A standing type packaging bag has a synthetic resin film and oilproof and waterproof paper, and has a bottom part with a gazette formed by folding a lower end of the oilproof and waterproof paper in a reverse V-shape in the side view. By forming a heat seal part dispersed with polymer particles on the oilproof and waterproof paper by polymer emulsion, a lot of gaps can be formed among the polymer particles, to secure the original air permeability of the paper. When using the packaging bag as a packaging member for daily dish of fried food, the crispy feeling of the just cooked fried food can be kept, and furthermore, when forming the bottom part with the gazette by jointing the paper sheets, the polymer particles on the surface fuse with each other to easily provide the heat sealability.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a stand-type packaging bag having moderate oil and water resistance, excellent heat sealability and air permeability, and particularly suitable for packaging cooked foods such as prepared foods such as fast foods, fried foods and grilled foods. Is.

  As this type of packaging bag, Patent Document 1 discloses a packaging bag made of a composite film in which one side surface and bottom surface are made of a laminated material and the other side surface is made of oil-resistant paper. In this packaging bag, the laminated material is composed of a side surface, a first bottom surface, a second bottom surface, and a seal surface formed by turning back three times at the lower end. It has a highly transparent three-layer structure consisting of an axially stretched PET film / PET resin layer, and heat sealability is improved by making the amorphous part 85% or more in the PET resin layer, which is originally not heat sealable. A configuration is disclosed.

  In the packaging bag, when the fried food is stored, the laminated material is completely transparent, so the shape and number of the stored fried food can be easily confirmed, and when the fried food is stored, Since the first bottom surface and the second bottom surface are expanded by the weight, there is an effect that a larger amount of fried food can be accommodated than a three-sided bag without a bottom surface.

JP 2016-22957 A

  By the way, in the packaging bag of patent document 1, since the bottom part with a gusset is comprised with the laminated material which provided the heat-sealability with the synthetic resin with high transparency, and a bottom surface is also transparent, a transparent feeling is too strong. Therefore, a stand-type packaging bag using oil-resistant and water-resistant paper such as unbleached kraft paper on the bottom surface is already on the market.

  In a stand-type packaging bag with such a bottom surface that is oil-resistant and water-resistant paper, when the gusset is formed at the bottom, the sides of the oil- and water-resistant paper must be joined together, ensuring heat-sealability to the oil- and water-resistant paper There is a need. In order to impart heat sealability to the oil and water resistant paper, an adhesive is applied to the oil and water resistant paper, or the oil resistant and water resistant paper itself is laminated with a heat sealable resin film. Furthermore, a technique of inserting a non-woven fabric between oil- and water-resistant papers to give heat sealability is also employed.

  However, when the adhesive is applied to the oil-resistant and water-resistant paper and bonded to the laminated material, the adhesive application process is increased in the bag making process, and there is a problem in production efficiency. Further, when a heat-sealing resin film laminated on oil-resistant and water-resistant paper is used, there is a problem that when heated in a microwave oven, water vapor generated from the stored fried food is difficult to escape from the oil-resistant and water-resistant paper side. Furthermore, the technique of inserting a non-woven fabric to give heat sealability has a drawback that the oil-resistant and water-resistant paper has a weak sealing strength, and the price of the packaging bag itself is increased by inserting the non-woven fabric.

  In view of the above, the present invention, of course, has appropriate oil resistance and water resistance, and is excellent in both heat sealability and breathability. The object is to provide a suitable stand-type packaging bag.

  In order to achieve the above object, the present invention uses a heat-sealable, oil- and water-resistant paper previously filed by the present applicant as an oil- and water-resistant paper for a composite film. The present invention provides a stand-type packaging bag that can easily heat-seal oil- and water-resistant paper at the bottom with a gusset.

That is, a preferred embodiment of the present invention has a synthetic resin film disposed on one surface and an oil-resistant and water-resistant paper disposed on the other surface, and the lower end of the oil-resistant and water-resistant paper is bent in an inverted V shape in a side view. A packaging bag in which a bottom portion with a gusset is formed, wherein a polymer emulsion is applied to one or both sides of the oil-resistant and water-resistant paper to form a heat seal portion in which the polymer is dispersed, and the polymer emulsion constituting the heat seal portion The basis weight is 20 to 200 g / m ² , the thickness is 25 to 300 μm, the air permeability is 200 seconds or less, and the solid content adhesion amount of the polymer emulsion is 0.5 to 5.0 g / m ^2. The peripheral edge of the bottom side from the inverted V-shaped central crease of the bottom is heat sealed to the lower end of the synthetic resin film, and the oil-resistant and water-resistant paper is formed at both ends of the bottom from the inverted V-shaped central fold of the synthetic resin film. They are heat sealed.

  According to the above configuration, the polymer particles are scattered and adhered to the paper surface by the application of the polymer emulsion, and there are many gaps between the polymer particles compared to the resin layer by the conventional laminate film, The air permeability can be ensured. Therefore, when it is used as a packaging material for deep-fried side dishes, it can maintain the crispness of the state where the deep-fried food such as croquettes is made. Moreover, because the polymer surface is interspersed with polymer particles on the surface of the paper, it has heat-sealability, and it is easy to join the paper when forming the bottom with a gusset because the polymer particles on the surface melt. Can be heat sealed.

It is a perspective view of the stand type packaging bag which is an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which the bag of FIG. 1 is opened. (A) is AA sectional drawing of FIG. 2, (b) is BB sectional drawing of FIG. It is an exploded perspective view of a packaging bag. FIG. 5 is a side sectional view of FIG. 4.

  Embodiments of the present invention will be described with reference to the drawings. The packaging bag 1 of this embodiment is comprised from the synthetic resin film 2 arrange | positioned on one surface, and the oil-resistant water resistant paper 3 arrange | positioned on the other surface, as shown in FIGS. And the lower end part of the oil-proof and water-resistant paper 3 is bent into an inverted V shape (convex inward) in a side view, and a bottom part 4 with a gusset (gusset) is formed.

  The synthetic resin film 2 is a laminated material of biaxially oriented polypropylene (OPP) and nonaxially oriented polypropylene (CPP). OPP is a material that is glossy, highly transparent, excellent in moisture resistance and water resistance, excellent in heat resistance and oil resistance, and excellent in both tensile strength and tear strength. However, since there is no heat sealing property, it is preferably used as a laminated material laminated with the next CPP film 2A.

  The CPP film 2A has gloss, high transparency, and excellent heat sealability. Excellent heat resistance, moisture resistance, water resistance and oil resistance. Therefore, the synthetic resin film 2 is bonded to the oil and water resistant paper 3 with the CPP film 2A on the inside, and the OPP film 2B is arranged on the outside. The synthetic resin film is not limited to those exemplified above, and may be other resin materials.

The oil and water resistant paper 3 uses the oil and water resistant paper described in Japanese Patent Application Laid-Open No. 2001-254293 disclosed by the present applicant. Specifically, the oil- and water-resistant paper 3 is not particularly limited as long as it is a paper obtained from paper-making fibers and imparted with oil and water resistance by internal addition, impregnation, coating, etc. of the oil and water resistance agent. However, if recyclability is added, wood pulp such as softwood pulp and hardwood pulp, non-wood pulp such as manila hemp pulp, sisal hemp pulp, flax pulp, and pulp made by chemically modifying these pulps, etc. A paper used by beating natural fibers as necessary and using them is preferable. The basis number, thickness, and air permeability of the oil and water resistant paper are appropriately selected depending on the relationship between the basis number, thickness, and air permeability required for the heat-sealable oil and water resistant paper, the type of polymer emulsion, and the solid content. A basis weight of 19.5 to 195 g / m ² , a thickness of 22 to 295 μm, and an air permeability of 200 seconds or less are suitable.

The oil and water resistant paper 3 has a heat seal portion in which polymer particles 3a are dispersed by applying a polymer emulsion on one or both sides in order to impart heat sealability. The polymer emulsion constituting the heat seal part has a basis weight of 20 to 200 g / m ² , a thickness of 25 to 300 μm, and an air permeability of 200 seconds or less, and the solid content adhesion amount of the polymer emulsion is 0.5 to 5. 0 g / m ² .

  The polymer emulsion is not particularly limited, but is vinyl acetate emulsion, copolymer emulsion of vinyl acetate and unsaturated acid such as acrylic acid, maleic acid, fumaric acid or an ester thereof, ethylene-vinyl acetate copolymer emulsion. A styrene-acrylate copolymer emulsion, an acrylate copolymer emulsion, an ionomer emulsion and the like are suitable.

These polymer emulsions include Chemipearl S series (Ionomer emulsion manufactured by Mitsui Petrochemical Co., Ltd .; crosslinked with sodium), AD-37P295 and AD-37P345 (ethylene-vinyl acetate copolymer emulsion manufactured by Toyo Morton Co., Ltd.), VINYBRAN What is marketed as 2750 (acrylic emulsion by Nissin Chemical Industry Co., Ltd.) etc. can be used. The adhesion amount (solid content) of the polymer emulsion in the heat seal portion 3a is suitably 0.5 to 5.0 g / m ² , and particularly preferably 2.5 to 3.5 g / m ² . When the adhesion amount is less than 0.5 g / m ² , the heat sealability is insufficient, and when it exceeds 5.0 g / m ² , the air permeability is low and the cost is high.

  The heat seal portion on the surface (one side or both sides) of the oil and water resistant paper 3 is formed by applying a polymer emulsion. There is no restriction | limiting in particular in coating conditions, The conditions normally employ | adopted when apply | coating a polymer emulsion can be employ | adopted.

The oil and water resistant paper 3 thus obtained has a basis weight of 20 to 200 g / m ² , a thickness of 25 to 300 μm, and an air permeability of 200 seconds or less. In particular, a basis weight of 30 to 70 g / m ² , a thickness of 37 to 105 μm, and an air permeability of 50 to 200 seconds are preferable. When the basis weight is less than 20 g / m ² , the water resistance is insufficient. When the basis weight exceeds 200 g / m ² , the air permeability may exceed 200 seconds. When the thickness is less than 25 μm, the water resistance is insufficient. The degree may exceed 200 seconds. If the air permeability exceeds 200 seconds, the release of water vapor from the cooked food during heating is inhibited. If the air permeability is less than 50 seconds, the food may be too dry during heating.

  When the heat seal part is constituted by a polymer emulsion as in the present embodiment, the heat seal part is formed by adhering the polymer particles 3a, and therefore, unlike a heat sealable resin layer in a conventional laminate film, a large number of heat seal parts are formed. Presumed to have a gap. In the packaging of food, it is a general usage method to wrap and heat-seal the heat-sealing part of the oil-resistant and water-resistant paper in contact with the food, and the oil-resistant and water-resistant paper 3 of this embodiment is usually heat-sealed. The part is formed on one side of the oil and water resistant paper 3, but can also be formed on both sides if necessary in relation to the form of packaging.

  When using the oil- and water-resistant paper 3 as the heating packaging bag 1, for example, the oil- and water-resistant paper 3 having a width of 20 cm and a length of 16 cm and a transparent synthetic resin film 2 having a width of 20 cm and a length of 15 cm are prepared. The oil and water resistant paper 3 includes a body portion having a length of 10 cm and a bottom portion 4 having a length of 6 cm, and bends the boundary between the body portion and the bottom portion inward. Further, the bottom 4 is bent in an inverted V shape (inner side is convex) at the center in the longitudinal direction 6 cm in a side view, and the packaging bag 1 with the bottom gazette is formed with the surfaces provided with the respective heat seal portions inside. can do. The upper end portion of the synthetic resin film 2 is a so-called mouth-shifting state in which the upper end portion protrudes upward from the oil- and water-resistant paper 3. In this case, the protruding synthetic resin film portion (mouth shifting portion) may function as a lid that closes the opening of the packaging bag 1.

  At this time, the left and right side portions 2b of the synthetic resin film 2 and the left and right side portions of the oil and water resistant paper 3 are heat sealed. Further, the peripheral edges 4 a and 4 b on the front end side from the central fold line 7 of the bottom part 4 are heat-sealed to the lower end parts 2 a and 2 b of the synthetic resin film 2. Furthermore, the oil- and water-resistant papers are heat-sealed at both ends 4c and 4d on the body side from the center fold line 7 of the bottom part 4. A portion shown by hatching in FIGS. 1, 2 and 4 is a heat seal portion. In FIG. 4, the crease 8 of the oil and water resistant paper 3 and the crease 9 of the synthetic resin film 2 indicate the boundary line between the bottom 4 and the trunk of the packaging bag 1.

  In addition, although the stand-type packaging bag 1 of this embodiment has illustrated the oil-based cooked food as the use, it can be used also as a packaging material of medical sterilization paper and sanitary goods.

  In addition, as the oil-resistant and water-resistant paper 3 of the present embodiment, paper having the composition and physical properties disclosed in JP 2001-254293 A is used. This embodiment relates to a stand-type packaging bag, and since it is a composite type of the synthetic resin film 2 and the oil and water resistant paper 3, the performance evaluation of individual materials is preferable to the performance evaluation as a whole. For performance evaluation such as heat sealability and air permeability, it is considered sufficient to evaluate only the oil and water resistant paper 3. Therefore, the performance evaluation of the oil and water resistant paper 3 is described below.

  First, the oil resistance, air permeability, heat seal strength, water retention, and cooked food heating test of the oil and water resistant paper 3 were measured and evaluated as follows.

[Oil resistance]
Measured by 3M kit test described in TAPPI T559 pm-96 (2000). The test piece was placed with the test surface facing up, one drop of the kit test solution was dropped from a height of 13 mm, and the excess solution was wiped off after 15 seconds, and the kit test solution was observed to see if it became a stain. The test was performed on 16 kinds of test solutions having different compositions, and the maximum liquid number of the kit test liquid that did not cause a stain was displayed as the oil resistance. The greater the oil resistance number, the higher the oil resistance, and usually 7 or more is desired as the oil resistant paper.

[Air permeability]
Based on JISP8117 (1980), the time for which 100 cc of air permeated was measured in seconds using a Denso meter type model B manufactured by Toyo Seiki Co., Ltd., and displayed as Gurley air permeability. The smaller the value of air permeability, the higher the air permeability.

[Heat seal strength]
Using a heat seal tester (TP-7018 manufactured by Tester Sangyo Co., Ltd.), heat sealing was performed at 190 ° C. and 0.3 MPa for 4 seconds, and then complete adhesion was confirmed. When peeled and the paper layer was torn, it was evaluated as “complete adhesion”.

[Water retention]
Fold the sample in half (inside the front or back of the sample) and fold the left and right sides to create an inverted trapezoid, and put 20 ml of water in an inverted trapezoidal bag with an upper side of 12 cm, a lower side of 6 cm, and a height of 10 cm. And hold it vertically to measure the time it takes for water to leak into the paper. Measurement is performed on two types of bags, the inner surface of the sample and the inner surface of the back surface.

[Heating test of cooked food]
In this test, the test was performed using a packaging bag with a bottom gusset using a synthetic resin film and oil-resistant and water-resistant paper. For example, using the oil-resistant and water-resistant paper 3 having a width of 20 cm and a length of 16 cm and the transparent synthetic resin film 2 having a width of 20 cm and a length of 15 cm, the lower end portion of the oil- and water-resistant paper 3 is folded into 6 cm in the vertical direction to form the bottom portion 4. The bottom part 4 was bent into an inverted V shape (convex inside) in the side view, and the surface provided with each heat seal part was set to the inside to form a packaging bag 1 with a bottom gusset. Both sides in the vertical direction and the bottom 4 were heat-sealed at a width of 25 mm at 190 ° C. and 0.3 MPa for 4 seconds. Four oysters are put in the obtained packaging bag 1, the upper end portion of the synthetic resin film 2 is made to function as a lid portion, this is bent, and heat-sealed in the same manner as described above.
After heating this with a microwave oven for 1 minute, the packaging bag 1 is taken out and the heating property is confirmed according to the following criteria.
A) The packaging bag does not rupture,
B) After opening the packaging bag, there are no water droplets inside.
C) Deep-fried food is not too soft,
The case where all of the conditions were satisfied was evaluated as “good”, and the case where any one of the conditions was not satisfied was evaluated as “impossible”.

The composition and physical properties of the oil-resistant and water-resistant paper 3 used are as follows.
<Composition of oil and water resistant paper 3>
(1) Pulp: N-BKP: 26% L-BKP: 74%
(2) Beating degree: 37 ° SR
(3) Internal components (quantity is solid weight per 1000 kg of pulp)
Fixing agent: 5kg of sulfuric acid band
Paper strength agent: 9kg of cationic starch,
Wet paper strength agent: 3.25 kg of polyamide epichlorohydrin resin.
(4) Size press coat components (quantity is solid weight per 1 m ^{3 of} size press coat solution)
Oil and water resistant agent: 9kg of fluororesin
Paper strength agent: 30 kg of cationic starch,
Antifoaming agent: 0.20 kg of silicone-based antifoaming agent,
(5) Solid content of size press coat component 1.2 g / m ²

<Physical properties of oil and water resistant paper>
(1) Basis weight 50.0 g / m ²
(2) Thickness 71μm
(3) Air permeability 71 seconds (4) Oil resistance 3M Kid 11
(5) Water retention 2 hours or more.

An ionomer emulsion (ionomer emulsion cross-linked with sodium manufactured by Mitsui Petrochemical Co., Ltd., trade name Chemipearl S-100) was coated on one surface of the oil- and water-resistant paper 3 under the following conditions. In order to prevent curling, water was applied to the back surface by rotor dampening.
Coating machine: Air knife coater,
Drying temperature: up to 120 ° C
Line speed: 100m / min,
Solid content of ionomer emulsion: 3.2 g / m ² .

The physical properties of the obtained oil and water resistant paper are as follows.
(1) Basis weight 53.2 g / m ²
(2) Thickness 76μm
(3) Air permeability 96 seconds (4) Oil resistance 3M kit 12
(5) Water retention 24 hours or more (6) Heat-sealability Full adhesion (7) Heated test of cooked food Good

  As described above, in the above embodiment, the polymer particles are scattered and adhered to the surface of the paper by applying the polymer emulsion to the oil and water resistant paper, and between the polymer particles compared to the resin layer formed by the conventional laminate film. It has a large number of gaps and can guarantee the original air permeability (air permeability) of the paper. Therefore, when it is used as a packaging material for deep-fried side dishes, the crispness in the state where fried foods such as croquettes are made can be maintained. Moreover, since the surface of the paper is interspersed with polymer emulsion by polymer emulsion, it has heat-sealing properties, and when the bottom part with gusset is formed, the surface polymer particles melt and heat. Sealing can be performed easily.

  In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added within the scope of the present invention. For example, in the above-described embodiment, an example in which the polymer emulsion is applied to one side of the oil-resistant and water-resistant paper is shown, but the polymer emulsion may be applied to both sides. Furthermore, in the said embodiment, although the upper end part of the synthetic resin film protruded upwards rather than oil-resistant water-resistant paper, it illustrated the packaging bag of what is called a mouth-shifting aspect, It is an aspect without mouth shifting not only this but Also good. Furthermore, the embodiment is not limited to the embodiment described above as long as the sheets are joined to each other at the bottom of the bag.

DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Synthetic resin film 2a Lower end part 3 Oil-resistant water-resistant paper 3a Polymer particle 4 Bottom part 4a, 4b Peripheral edge 4c, 4d Both end part 7 Center fold 8,9

Claims (1)

A package having a synthetic resin film disposed on one side and an oil-resistant and water-resistant paper disposed on the other side, wherein the bottom end of the oil-resistant and water-resistant paper is bent in an inverted V shape in a side view to form a bottom portion with a gusset A bag,
A heat-sealed part in which a polymer emulsion is applied to one side or both sides of the oil-resistant water-resistant paper and the polymer is dispersed is formed,
The polymer emulsion constituting the heat seal part has a basis weight of 20 to 200 g / m ² , a thickness of 25 to 300 μm, and an air permeability of 200 seconds or less, and the solid content adhesion amount of the polymer emulsion is 0.5 to 5. 0 g / m ²
The peripheral edge on the tip side from the inverted V-shaped center fold of the bottom is heat sealed to the lower end of the synthetic resin film,
A stand-type packaging bag characterized in that the oil- and water-resistant paper is heat-sealed at both ends on the body side from the inverted V-shaped central fold at the bottom.

Images