JPH11965A - Laminate film and packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a film equally equipped with an appropriate gas permeability and an appropriate water content permeability. SOLUTION: A laminate film is obtained by bonding at a plurality of linear bond parts 5 wherein a water content permeable film 2 and a thermoplastic resin film 4 having a permeable hole are crossed. A bag is prepared by making the thermoplastic resin film 4 of the laminate film 1 inside and sealing its outer edge to obtain a packaging bag wherein the bond part has a 10 deg. to 80 deg. crossing angle to the edge of the packaging bag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to laminated films.
The packaging bag made of the laminate film of the present invention has an appropriate gas permeability and moisture permeability, and contains, for example, a volatile freshness preserving agent and the like, and continuously releases it to maintain its freshness. Maintain the effect for a long time.

[0002] Allyl isothiocyanate (CH ₂ = CHCH ₂ NCS: hereinafter referred to as AIT) contained in wasabi and mustard inhibits the propagation of pathogenic bacteria such as food poisoning bacteria and is useful as a freshness preservative for fish meat and animal meat. It is. In addition, allyl isothiocyanate suppresses the generation of ethylene, which is known as an aging hormone for vegetables and fruits, and is also useful as a freshness preserving agent for vegetables and fruits to prevent aging. In recent years, lunch boxes and side dishes, or vegetables, meat,
In many cases, fresh fish and the like are overlapped or covered with a film of polyethylene or polypropylene on a plastic container such as expanded polystyrene.

[0003] When a product is packaged in polyethylene or the like having a high gas permeability together with allyl isothiocyanate, the active ingredient is quickly volatilized out of the package, and the effect of maintaining freshness is short. Therefore, there has been an attempt to gradually release the active ingredient into a food package by wrapping the freshness preserving agent itself in a film.
Examples of such a film include polyethylene, a film of polypropylene alone, and a laminated film of polypropylene / polyethylene. However, these films have too high gas permeability and release AIT in a short time, so that the effect of maintaining freshness is not persistent.

[0004] Further, the effect of maintaining the freshness of AIT is greater at low humidity, and it is preferable to lower the humidity of the AIT atmosphere in the food package for maintaining freshness. The laminated film composed of cellophane / perforated polyethylene has a moisture control effect by passing moisture, but cellophane has an AIT gas permeability of 100 to 20.
Since the amount of AIT supplied is so small as 0 ml / m ² / 24H, it is not possible to obtain a sufficient AIT concentration in the food packaging container. Further, when a polyvinyl alcohol-polyethylene laminated film is used, the polyethylene has a moisture barrier property, so that the moisture in the food packaging container cannot be absorbed, which is not preferable.

[0005]

As described above, heretofore, there has not been known a laminate film capable of releasing an appropriate amount of AIT for a long period of time and removing moisture in a food packaging container. It is an object of the present invention to provide a film having a suitable gas permeability, particularly an AIT permeability, and a suitable moisture permeability.

[0006]

SUMMARY OF THE INVENTION The present invention provides a laminate film comprising a moisture permeable film and a thermoplastic resin film having a permeable hole joined at a plurality of intersecting linear joints.

[0007]

DETAILED DESCRIPTION OF THE INVENTION Next, the present invention will be described in detail with reference to the drawings. FIG. 1 shows a laminate film of the present invention,
(A) is a schematic plan view, (b) is a schematic sectional view thereof,
(C) is a partial enlarged plan view. 2A and 2B show a packaging bag in which the laminate film is made. FIG. 2A is a schematic plan view, and FIG. 2B is a schematic sectional view thereof.

In the laminated film 1 of the present invention, a moisture permeable film 2 and a thermoplastic resin film 4 having a transmission hole 3 are joined at a plurality of linear joining portions 5 which obliquely intersect in a grid pattern. I have.

Examples of the water-permeable film 2 include cellophane, polyvinyl alcohol (PVA) film, nylon film and the like, and cellophane and PVA film are particularly preferable. The film thickness is 12-40μ
m is preferred.

As the thermoplastic resin film 4, polyethylene film, polypropylene film, ethylene-
Examples thereof include a vinyl acetate copolymer (EVA) film, a polyvinyl chloride film, and a polyester resin film, and polyethylene and EVA are particularly preferable. Further, the thickness of the film is preferably 12 to 40 μm.

The thermoplastic resin film 4 has a transmission hole 3. The size of such a transmission hole is 0.01 to 3 mm,
Such transmission holes are provided at a density of about 1 to 10 mm.

These films are joined at a plurality of intersecting linear joining portions 5 to form a laminated film 1.
The planar shape of the joint 5 is preferably a lattice as shown in FIGS. 1 (a) and 1 (c). The width of each linear joint 5 is 1 to 10
mm, preferably about 2 to 7 mm. In the case of a lattice shape, the distance between the joints is 0.3 to 30 mm, preferably 0.8.
It is practical to be about 20 mm. The intersection angle α is 40 to 140 degrees, preferably 60 to 120 degrees. If the shape of the joint is out of these ranges, the adhesive strength will be reduced, and it will be difficult to make a packaging bag exhibiting a sufficient release amount of the freshness retaining agent. Joining can be performed by a known method such as using an adhesive.

As shown in FIG. 2, in order to manufacture the packaging bag 10 of the present invention, the two laminated films 1 are heat-sealed with the thermoplastic resin film 4 inside and the outer edge 11 partly left. The bag is sealed by an appropriate known method. At this time, as shown in FIG. 2 (a), the linear joining portion 5 is 10 to 80 degrees with respect to the outer edge 11 of the packaging bag 10,
The bag is formed so as to form an intersection angle of preferably 20 to 70 degrees, more preferably 30 to 60 degrees. If the angle is out of this range, the number of gas permeation holes to the outside decreases, and the release of the freshness preserving agent becomes insufficient.

It is preferable that the packaging bag 10 is used as a packaging freshness retaining agent that stores the freshness retaining agent 12 and releases it gradually. Examples of the freshness retaining agent 12 include mustard extract, wasabi extract, isothiocyanate compounds such as allyl isothiocyanate (AIT), and other herbal extracts (antibacterial).
A, natural mucous polysaccharides (natural paste) such as juran gum, guar gum, locust bean gum, xanthan gum,
Examples of the freshness retaining agent include other sugars, dibasic acids such as adipic acid, sorbic acid and malic acid, and other organic acids, and carriers such as minerals such as sepiolite.

[0015]

As shown in FIG. 2, the gas of the freshness retaining agent 12 passes through the permeation hole 3a of the thermoplastic film 4 outside the outermost edge joint 5a among the joints 5 of the laminated films. . Then, on the outer edge 11 of the bag,
Evaporates slowly out of the bag through the gap between the films.
On the other hand, among the permeation holes provided in the thermoplastic resin film 4, the freshness retaining agent gas which has come out from the permeation hole 3 b inside the joint 5 a is transmitted by the moisture permeable film 2 outside the packaging bag 10. Volatilization is prevented. For this reason, the effective permeation holes which contribute to the release of the freshness retaining agent gas are limited to those existing outside the outermost edge joint portion 5a of the packaging bag 10, and the amount of released gas is adjusted. On the other hand, the moisture outside the packaging bag 10 is absorbed by the freshness retaining agent 12 from almost the entirety of the laminated film 1. That is, the moisture that has permeated from the moisture-permeable film 2 on the outer surface of the packaging bag 10 passes through a large number of transmission holes 3 (3b) provided in the thermoplastic resin film 2 and absorbs moisture into the packaging freshness retaining agent 12 inside. Is done. Therefore, the freshness retaining agent gas is gradually released to the outside through a limited number of hollow holes, while absorbing external moisture.

[0016]

EXAMPLES Next, the present invention will be described more specifically based on examples.

Example 1 As shown in FIG. 2, cellophane (21 μm thick; Taiko PT # 300, Nimura Chemical Co., Ltd.)
Co., Ltd.), a diagonal grid coating was performed using a urethane-based adhesive with a width of 5 mm, an interval between diagonal lines of 10 mm, and an intersection angle of 90 degrees. Next, use a perforated polyethylene (thickness 3
0 μm; TWC # 30: manufactured by Tosello Co., Ltd.) was dry-laminated. Using this laminated film, a three-sided sealed bag (7 × 7 cm) was prepared. In this bag, 3 g of adipic acid carrying 1% of mustard extract was sealed. A container with a lid containing this packaging freshness preservative together with 50 g of cabbage shreds
(500 mL) and stored, and the viable cell count after 72 hours at 10 ° C. was measured.

Blank cellophane / porous polyethylene Initial number of bacteria 1.8 × 10 ³ 1.8 × 10 ³ After 72 hours 1.2 × 10 ⁷ 3.5 × 10 ³

Example 2 PVA (20 μm thick) and perforated ethylene-vinyl acetate copolymer (EVA, 30 μm thick)
Was used to produce a laminated film in the same manner as in Example 1 to prepare a three-side sealed bag. When a test was performed in the same manner as in Example 1, good results were obtained as described below.

Example 3 A laminated film was manufactured in the same manner as in Example 1 using nylon (15 μm in thickness) and perforated polypropylene (40 μm in thickness), and a three-side sealed bag was prepared. When a test was performed in the same manner as in Example 1, good results were obtained as described below.

Blank PVA / porous EVA nylon / porous polypropylene Initial number of bacteria 3.0 × 10 ² 3.0 × 10 ² 3.0 × 10 ² After 72 hours 5.8 × 10 ⁷ 1.3 × 10 ³ 1.8 × 10 ³

Example 4 A laminated film was manufactured in the same manner as in Example 1 except that the distance between the oblique lines was 1 mm in the application of the urethane adhesive in Example 1. Using this laminate film, a three-sided sealed bag (7 × 7 cm) was prepared and tested in the same manner as in Example 1. As a result, good results were obtained as described below.

Blank cellophane / porous polyethylene Initial number of bacteria 1.3 × 10 ⁴ 1.3 × 10 ⁴ After 72 hours 1.7 × 10 ⁸ 1.5 × 10 ⁵

[0024]

According to the present invention, a laminate film having an appropriate gas permeability, particularly an AIT and an appropriate moisture permeability can be obtained. When AIT is held in a bag using this film, an appropriate amount of AIT is released over a long period of time, and moisture in the food packaging container is removed to maintain freshness of meat, vegetables, and fruits for a long time in product packaging. be able to.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a laminated film of the present invention. (a) is a schematic plan view, (b) is a schematic sectional view thereof,
(c) is an enlarged plan view.

FIG. 2 is an explanatory view showing a packaging bag in which a laminated film is made. (a) is a schematic plan view, and (b) is a schematic sectional view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminate film 2 Moisture permeable film 3 Permeation hole 4 Thermoplastic resin film 5 Joining part 10 Packaging bag 11 Outer edge 12 Freshness preserving agent

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kenji Kurari, Inventor 6-16-25 Chayama, Jonan-ku, Fukuoka City, Fukuoka Prefecture (72) Yukari Mihara 5-60-406, Sukunami, Kasuga-shi, Fukuoka Prefecture

Claims (6)

[Claims] 1. A laminated film comprising a moisture permeable film and a thermoplastic resin film having a permeable hole joined at a plurality of intersecting linear joints. 2. The laminated film according to claim 1, wherein the moisture-permeable film is a cellophane, polyvinyl alcohol or nylon film. 3. The thermoplastic resin film is made of polyethylene, polypropylene, ethylene-vinyl acetate copolymer,
3. The laminated film according to claim 1, which is a film of polyvinyl chloride or a polyester resin. 4. A packaging bag formed by making the laminated film of claim 1 with a thermoplastic resin film inside, and sealing the outer edge thereof to form a bag. Packaging bag having a crossing angle of 20 to 70 degrees. 5. The packaging bag according to claim 4, wherein said joining portion is joined by an adhesive, and bag making is performed by heat sealing. 6. The packaging bag according to claim 4, wherein a mustard extract, a wasabi extract, an allyl isothiocyanate or a herbal extract is stored on a natural polysaccharide, a solid organic acid, or a sepiolite for storing a freshness-preserving agent.