KR200220128Y1 - Laminated film for food packaging - Google Patents

Abstract

The present invention is excellent in preventing condensation inside the wrapping paper, so that the freshness of the product is maintained for a long time,

The antifogging surfactant is blended in an amount of 0.1 to 10% by weight, and the polypropylene resin having a melt index of 3 to 10 g / 10 minutes is used as the main layer, and one or both surfaces of the surface layer is 0.1 to 10% by weight of the antifogging surfactant. The present invention relates to a laminated film for baking packaging, which is prepared by laminating a co-extrusion antifogging non-stretched polypropylene film composed of a polypropylene copolymer resin having a melt index of 5 to 12 g / 10 minutes on a base film.

Since the laminated film does not form water droplets inside the wrapping paper, the product looks fresh, and moisture evaporation of the product is suppressed, so that freshness is maintained for a long time, so that the laminated film is suitable for packaging bakery products containing a lot of moisture.

Description

Laminated film for food packaging

The present invention relates to a laminated film for bakery packaging, and more particularly, to a condensation inside a package by manufacturing an anti-fogging non-stretched polypropylene film, which is blended with an anti-fogging surfactant, by laminating with a base film. The present invention relates to a laminating film for bakery packaging, which has an excellent prevention effect so that the freshness of the product is maintained for a long time.

In general, baking packaging is mainly used to prevent the evaporation of the moisture contained in the product, and to block the external moisture is not absorbed into the product, the packaging material excellent in moisture barrier properties, conventionally stretched polypropylene, unstretched poly Propylene, nylon, polyester, polyethylene films and the like have been used alone or laminated (laminated).

However, the films are evaporated during the storage, distribution, and display of the product to form small droplets of water inside the packaging, which causes the product to continuously evaporate, and the packaging becomes cloudy, resulting in poor packaging appearance. However, there is a problem in that the leading of the product is easily deteriorated and the commodity value is lowered accordingly.

The present invention has been made in order to solve the problems as described above, an object of the present invention is to provide a laminated film for baking packaging that is excellent in the prevention of condensation inside the wrapping paper, thereby keeping the leading of the product for a long time.

The above object of the present invention is an antifogging non-expanded film co-extruded such that a polypropylene resin containing an antifogging surfactant is used as a center layer and one or both surfaces of the surface layer are made of a polypropylene copolymer resin containing an antifogging surfactant. It is achieved by providing a laminated film for baking packaging made of a polypropylene film.

1 is a cross-sectional view of the antifogging non-stretched film of the present invention,

Figure 2a is a cross-sectional view of one embodiment of the present invention baking packaging laminated film,

Figure 2b is a cross-sectional view of another embodiment of the present invention baking packaging laminated film,

Explanation of symbols on the main parts of the drawings

10: antifogging unstretched film

11: center layer 12: surface layer

20: low density polyethylene resin

20 ': polyurethane adhesive

30: base film

Inventive bakery packaging laminated film is composed of a polypropylene resin having an antifogging surfactant of 0.1 to 10% by weight and a melt index of 3 to 10 g / 10 minutes as the central layer 11, and one surface of the surface layer 12 or An antifogging non-stretched polypropylene film (10) co-extruded so as to be composed of a polypropylene copolymer resin having a melt index of 5 to 12 g / 10 minutes and blended with an antifogging surfactant at 0.1 to 10% by weight on both sides of the base film ( It is prepared by laminating to 30).

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited thereto.

As shown in FIG. 1, the antifogging non-stretched polypropylene film has a polypropylene resin having a melt index of 3 to 10 g / 10 minutes as the central layer 11, and the surface layer 12 is coextruded on both sides thereof. It is a film of a layer structure, One side or both sides of the said surface layer 12 consists of polypropylene copolymer resin.

In the present invention, the polypropylene copolymer resin constituting the surface layer is selected from propylene-ethylene copolymer, propylene-butene copolymer or propylene-ethylene-butene terpolymer, and has good flowability of the resin in the extruder. In order to achieve this, the melt index is preferably 5 to 12 g / 10 minutes.

In addition, the polymer resin (polypropylene resin and polypropylene copolymer resin) constituting the antifogging non-stretch film is at least one selected from the group consisting of sorbitan fatty acid esters, glycerin fatty acid esters, and polyglycerol fatty acid esters, respectively. The antifogging surfactant is blended in an amount of 0.1 to 10% by weight to provide the film with antifogging properties such that water droplets do not form even when the surface temperature drops below the dew point of ambient air.

In the case where the amount of the antifogging surfactant is less than 0.1% by weight, condensation is easily generated, such as condensation easily occurring. When the antifogging surfactant is added in an amount of more than 10% by weight, the antifogging property is excellent, but the printing property and the lamination property are insufficient, and the production cost is economically achieved. It is not preferable because there is a disadvantage that rises and the heat-adhesive temperature becomes high.

The antifogging non-stretched polypropylene film configured as described above can be designed with an appropriate thickness depending on the application, but the overall thickness of the film is 20 to 100 μm, the central layer is 90 to 50% of the overall thickness of the film, and each surface layer is the overall thickness of the film. It is preferable to make it so that it becomes 5 to 25% of.

On the other hand, the antifogging non-stretched polypropylene film has a surface resistance of about 10 10 to ¹² kPa, and thus can be used for baking packaging by itself, but it is polypropylene for enhancing durability and improving packaging efficiency. The antifogging non-stretched film 10 is laminated on a base film 30 such as a film, a stretched polyethylene terephthalate film or a nylon film to prepare a laminated film for baking packaging.

The present invention baking packaging laminated film is an extrusion lamination method using a low density polyethylene resin 20 as shown in Figure 2a and a dry lamination method using a solvent-free polyurethane adhesive 20 'as an adhesive as shown in Figure 2b It is produced by laminating the base film 30 on the antifogging non-stretch film 10.

The extrusion lamination method uses a low density polyethylene resin 20 for extrusion having a melt index of 2 to 20 g / 10 minutes, and a thickness of 10 to 30 microns is appropriate.

In addition, the dry lamination method is a method of applying an adhesive to a film and then pressing and bonding it to a base film. Generally, both a solvent-free polyurethane adhesive and a solvent-based polyurethane adhesive (one-component or two-component) are used. In the present invention, when the film is laminated using a solvent-type general adhesive, antifogging property is eliminated by the solvent, and thus, the film is laminated using a solvent-free polyurethane adhesive.

In addition, it is preferable that the coating thickness of the said adhesive agent is 0.5-5.0 g / m <2>, and the adhesive force with a base film is 500-5000 g / 25 mm at this time.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto.

Example 1

Low-temperature thermal bonding is possible by using a polypropylene resin having a melt index of 7 g / 10 minutes as a center layer and a propylene-ethylene-butene copolymer having a melt index of 10 g / 10 minutes on one side of the surface layer (heat adhesive layer). Corona-treated three-layer coextruded non-stretch film for printing and lamination using polypropylene resin in the layer (corona layer), and 1.0 wt% of sorbitan fatty acid ester is prescribed in the center layer and heat adhesive layer of the film. An unstretched polypropylene film was prepared.

Example 2

The low-temperature heat-adhesion is possible by using a polypropylene resin having a melt index of 7 g / 10 minutes as the center layer and a propylene-ethylene copolymer having a melt index of 8 g / 10 minutes on one side of the surface layer (heat adhesive layer). Corona-layer) 3-layer co-extruded film that is corona-treated to enable printing and lamination using polypropylene resin, and 1.0 wt% of glycerin fatty acid ester is prescribed in the center layer and heat-adhesive layer of this film. Propylene film was prepared.

Example 3

A low-temperature heat-adhesion is possible by using a propylene-butene copolymer having a melt index of 10g / 10min on one side of the surface layer (heat adhesive layer) and a polypropylene resin having a melt index of 7g / 10min as a center layer. Corona-layer) 3-layer co-extruded film that is corona-treated to enable printing and lamination using polypropylene resin, and 1.0 wt% of polyglycerin fatty acid ester is prescribed in the center layer and heat-adhesive layer of this film. Polypropylene film was prepared.

Example 4

A biaxially oriented polypropylene film having a thickness of 20 μm was laminated on the antifogging non-stretched film prepared in Example 1 using a solvent-free polyurethane adhesive, and the adhesive coating thickness was 0.5 g / m 2 and the adhesive force was 800 g / m. A 25 mm laminated film was prepared.

Example 5

An extrusion laminating thickness of 15 microns was obtained by laminating a stretched polyethylene terephthalate film having a thickness of 12 μm using a low density polyethylene resin having a melt index of 12 g / 10 minutes as an anti-fogging non-stretched film prepared in Example 2. A laminated film was prepared.

Example 6

The anti-fogging non-stretched film prepared in Example 3 is laminated with a nylon film having a thickness of 15㎛ as a base film using a solvent-free polyurethane adhesive, the adhesive coating thickness is 0.5g / ㎡ and the adhesive force is 700g / 25㎜ A laminated film was prepared.

Comparative Example 1

Low-temperature thermal bonding is possible by using a polypropylene resin with a melt index of 7 g / 10 min as a center layer and a propylene-ethylene-butene copolymer with a melt index of 10 g / 10 min on one side of the surface layer (heat adhesive layer). Corona-treated three-layer coextrusion-free film that can be printed and laminated using polypropylene resin in the layer (corona layer) .Anti-fogging agent is provided by preserving 0.05 wt% of anti-fogging surfactant in the center layer and heat-adhesive layer of the film. An unstretched polypropylene film was prepared.

Comparative Example 2

Low-temperature thermal bonding is possible by using a polypropylene resin with a melt index of 7 g / 10 min as a center layer and a propylene-ethylene-butene copolymer with a melt index of 10 g / 10 min on one side of the surface layer (heat adhesive layer). Corona-treated three-layer coextruded non-stretch film for printing and lamination using polypropylene resin for the layer (corona layer) .Anti-fogging anti-fogging agent is prevented by preserving 12.0% by weight of anti-fogging surfactant in the center layer and heat-adhesive layer of the film. An unstretched polypropylene film was prepared.

Comparative Example 3

A laminated film was prepared by using a solvent-type polyurethane adhesive on a biaxially stretched polypropylene film having a thickness of 20 μm as a base film in the antifogging non-stretched film of Example 1.

The results of comparing the antifogging property and the long-term persistence and heat adhesion of the antifogging films prepared according to Examples 1 to 6 and Comparative Examples 1, 2 and 3 are shown in Table 1 below. The anti-fogging property was put in a suitable amount of water in a paper cup, sealed with the film, and refrigerated and observed condensation state over time. The thermal adhesiveness was measured using a TOYOSEIKI heat sealer.

Anti-fogging and Heat Adhesive Comparison Test Results Fence wall Thermal adhesion Immediately after packing After 5 minutes of refrigeration Example 1 No condensation No condensation Excellent thermal adhesiveness Example 2 No condensation No condensation Good thermal adhesion Example 3 No condensation No condensation Good thermal adhesion Example 4 No condensation No condensation Excellent thermal adhesiveness Example 5 No condensation No condensation Good thermal adhesion Example 6 No condensation No condensation Good thermal adhesion Comparative Example 1 No condensation Has condensation Excellent thermal adhesiveness Comparative Example 2 No condensation No condensation Heat adhesive temperature rise Comparative Example 3 No condensation Has condensation Excellent thermal adhesiveness

As can be seen from the anti-fogging test results of the films prepared in the above Examples and Comparative Examples, the present invention is an effective formulation of the anti-fogging surfactant has no condensation even after elapsed time in refrigeration, and its sustainability is also good. If the surfactant is used in excess of 0.1 to 10% by weight or in an extremely small amount, the anti-fogging property and heat adhesiveness may be adversely affected. In addition, the anti-fogging property may be deteriorated when the surfactant is laminated using a solvent adhesive.

The present invention baking packaging laminated film is manufactured by laminating an antifogging non-stretched polypropylene film with a base film, it is excellent in antifogging property can be usefully used for baking packaging applications.

That is, the present invention has a very good condensation prevention effect, so that water droplets do not form inside the packaging, so the product looks fresh, and the moisture evaporated from the product is not condensed, so that moisture evaporation of the product is suppressed and the freshness is maintained for a long time. It is suitable for the packaging of bakery products that contain a lot of water since it prevents the product from being deteriorated due to the drop of water droplets.

Claims (5)

The antifogging surfactant is blended in an amount of 0.1 to 10% by weight, and the polypropylene resin having a melt index of 3 to 10 g / 10 minutes is used as the center layer 11, and one or both surfaces of the surface layer 12 Baking, produced by laminating a co-extrusion antifogging non-stretched polypropylene film 10 composed of polypropylene copolymer resin blended at 0.1 to 10 wt% and having a melt index of 5 to 12 g / 10 minutes on a base film 30 Packaging laminated film. According to claim 1, The anti-fogging surfactant is sorbitan fatty acid esters, glycerin fatty acid esters, polyglycerol fatty acid ester, characterized in that at least one selected from the group consisting of laminated film for baking packaging. The bakery packaging agent according to claim 1, wherein the polypropylene copolymer resin is one selected from the group consisting of propylene-ethylene copolymers, propylene-butene copolymers, and propylene-ethylene-butene terpolymers. Laminated film. The laminated film for baking packaging according to claim 1, wherein the lamination method is an extrusion lamination method using a low density polyethylene resin (20) having a melt index of 2 to 20 g / 10 minutes. 2. The laminated film for baking packaging according to claim 1, wherein the lamination method is a dry lamination method using a solvent-free polyurethane (20 ') as an adhesive.