KR200243418Y1 - Anti-foggied low temperature heat seal cast polypropylene film for agricultural products packaging - Google Patents

Abstract

The present invention relates to a co-extruded unstretched film for packaging agricultural products with antifogging property and low temperature heat adhesiveness, the purpose of which is excellent in preventing condensation inside the packaging paper, and thus the appearance of the product is excellent and the freshness is maintained for a long time. An object of the present invention is to provide a film in which thermal adhesiveness is achieved at a lower temperature than a conventional antifogging film.

The constitution of the present invention is a polypropylene film, in which an antifogging surfactant is blended at 0.1 to 20% by weight, and a polypropylene resin having a melt index of 3 to 10 g / 10 minutes is used as the center layer 11, and one surface of the surface layer In the corona layer 12, a polypropylene resin having a melt index of 3 to 10 g / 10 minutes is used. The heat adhesive layer 13, which is another side, has 0.1 to 20% by weight of an antifogging surfactant and 1 to a special low temperature resin. The coextrusion antifogging non-stretch low temperature heat-adhesive polypropylene film 15 which consists of polypropylene copolymer resin which is mix | blended with 50 weight% resin and whose melt index is 5-12 g / 10min is made into the summary.

Description

Anti-foggied low temperature heat seal cast polypropylene film for agricultural products packaging}

The present invention relates to a co-extruded film for packaging agricultural products, and more specifically, an anti-fogging non-expandable low-temperature heat-adhesive polypropylene film co-extruded by blending an anti-fogging surfactant is effective in preventing condensation inside the package. It is excellent in the film to induce a fresh effect of the product, and also has an anti-fog and relates to a agricultural product packaging film that enables heat bonding at low temperatures.

In general, since agricultural products are organisms, moisture is emitted even after packaging. When packaging agricultural products with conventional products, moisture generated from agricultural products is changed into water droplets on the surface of the film inside the polypropylene packaging film after packaging. As a result of this, the wrapping paper is softly changed, so that not only the appearance is deteriorated but also the freshness is easily dropped and there is a problem of degrading the quality of the product.

In addition, the conventional anti-fogging film is not thermally bonded at a low temperature, the thermal adhesive quality is lowered, the high-speed packaging of the packaging equipment is difficult, the productivity is lowered, so the operation is inevitable at high temperatures, and thus may be shortened the life.

The purpose of the present invention for solving the above problems is to prevent the condensation inside the wrapping paper is excellent, and thereby the appearance of the product is excellent, the freshness is maintained for a long time, and also to achieve a heat adhesive at a low temperature than conventional anti-fogging film To provide a film.

The object of the present invention is to use a polypropylene resin blended with an antifogging surfactant as a center layer, polypropylene resin on one side (corona layer) of the surface layer and antifogging surfactant and heat on the other side (heat adhesive layer) It is achieved by providing an antifogging non-stretched low temperature heat adhesive polypropylene film for agricultural packaging which is coextruded to be composed of a polypropylene copolymer resin blended with an adhesive special low temperature heat adhesive resin.

1 is a cross-sectional view of a co-extruded non-stretched film for packaging agricultural products with anti-fogging property and low temperature heat adhesiveness in the present invention,

Figure 2 is a cross-sectional view of one embodiment of the co-extruded unstretched film for packaging agricultural products with anti-fogging property and low temperature heat adhesiveness.

<Explanation of symbols for the main parts of the drawings>

(11): center layer

(12): surface layer (corona layer)

(13): surface layer (heat adhesive layer)

(14) Contents (Agricultural Products)

(15): antifogging low temperature heat-bonded unstretched film

The present invention to achieve the object as described above and to perform the problem for eliminating the conventional defects, the agricultural product packaging co-extruded film is 0.1 to 20% by weight of antifogging surfactant is blended and the melt index is 3 to 10g / 10 minutes Phosphorus polypropylene resin is used as the center layer 11, and a polypropylene resin having a melt index of 3 to 10 g / 10 minutes is used for the corona layer 12, which is one surface of the surface layer, and the heat-adhesive layer 13, which is the other surface, is used. Co-extruded anti-fogging unstretched low temperature composed of polypropylene copolymer resin having 0.1 to 10% by weight of an antifogging surfactant and 1 to 50% by weight of a special low temperature resin and a melt index of 5 to 12 g / 10 minutes It is characterized by a heat-adhesive polypropylene film 15.

Hereinafter, the configuration and the operation of the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of the agricultural product packaging co-extruded non-stretched film having the anti-fogging property and low temperature heat adhesiveness in the present invention, Figure 2 is A cross-sectional view of one embodiment is shown.

As the anti-fogging non-stretched polypropylene film of the present invention, as shown in Fig. 1, the polypropylene resin having a melt index of 3 to 10 g / 10 minutes is used as the center layer 11, and the corona layer 12 and the heat-adhesive layer on both surfaces thereof. It is a 3-layered film co-extruded into the surface layer of (13), and the heat-adhesive layer of the said surface layer consists of a polypropylene copolymer and special low temperature resin.

In the present invention, the polypropylene copolymer resin constituting the surface layer 13 is selected from propylene-ethylene copolymer, propylene-butene copolymer or propylene-ethylene-butene terpolymer, and the special low temperature resin is an olefin-based resin. Elastomers, PET elastomers and rubber systems are selected and used, and in order to improve the flowability of the resin in the extruder, 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 at 0.1 to 20% 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.

If the addition amount of the antifogging surfactant is less than 0.1% by weight, condensation may be insufficient, such as condensation easily occurring. If the antifogging surfactant is added, the antifogging property is excellent if it exceeds 20% by weight. It is not preferable because there are disadvantages such as an increase in manufacturing cost and an increase in thermal bonding possible temperature.

In addition, when the special low temperature thermal adhesive resin is less than 1% by weight, the low temperature thermal adhesiveness does not come out, and when the temperature is 50% by weight or more, the low temperature thermal adhesiveness is excellent, but the breaking property is induced and it is not economically suitable due to the increase in manufacturing cost.

The antifogging non-stretch low-temperature heat-adhesive 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 20-100 μm, and the center layer is 90-50% of the overall thickness of the film, and each surface layer It is preferable to manufacture so that it may become 10 to 50% of this film total thickness.

On the other hand, the antifogging unstretched low temperature heat adhesive polypropylene film is designed to maintain a low heat adhesion temperature without using a large amount of expensive low temperature heat adhesive resin exhibiting a low surface resistance of about 10 10 to ¹² Ω and excellent antifogging property It is economically very good.

Reference numeral 14 is the contents (agricultural product).

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

Example 1

Low temperature using 10% by weight of a propylene-ethylene-butene copolymer and an olefin elastomer having a melt index of 10g / 10min on one side of the surface layer (heat adhesive layer) as a center layer of polypropylene resin having a melt index of 7g / 10min. 3-layer coextruded unstretched film that enables heat adhesion and prints with polypropylene resin on the opposite layer (corona layer), and 1.0 weight of sorbitan fatty acid ester in the center layer and heat adhesive layer of the film. Anti-fogging non-stretch low-temperature heat-adhesive polypropylene film was prepared by%.

Example 2

Using a polypropylene resin with a melt index of 7g / 10min as the center layer and using 10% by weight of propylene-ethylene-butene copolymer and a rubber-based low-temperature resin having a melt index of 8g / 10min on one side of the surface layer (heat adhesive layer) A three-layer coextruded unstretched film that enables low-temperature thermal bonding and prints with polypropylene resin on the opposite layer (corona layer), and 1.0 weight of glycerin fatty acid ester in the center layer and heat-adhesive layer of the film. Anti-fogging non-stretch low-temperature heat-adhesive polypropylene film was prepared by%.

Example 3

Low temperature thermal bonding using polypropylene resin with a melt index of 7g / 10min as the center layer and 10% by weight of propylene-butene copolymer and olefin elastomer having a melt index of 10g / 10min on one side of the surface layer (heat adhesive layer) 3 layer co-extruded unstretched film that is corona-treated to enable printing using polypropylene resin on the opposite layer (corona layer), and 1.0 wt% of glycerin fatty acid ester is prescribed to the center layer and heat adhesive layer of the film. An antifogging non-stretched polypropylene film was prepared.

Example 4

Low temperature thermal bonding using polypropylene resin with a melt index of 7g / 10min as the center layer and 10% by weight of propylene-ethylene copolymer and olefin elastomer having a melt index of 10g / 10min on one side of the surface layer (heat adhesive layer) 3 layer co-extruded unstretched film that is corona-treated to enable printing using polypropylene resin on the opposite layer (corona layer), and 1.0 wt% of glycerin fatty acid ester is prescribed to the center layer and heat adhesive layer of the film. An antifogging non-stretched polypropylene film was prepared.

Comparative Example 1

The polypropylene resin having a melt index of 7g / 10min is used as the center layer, and the surface of the surface layer (heat adhesive layer) has a low melting point using 10% by weight of a propylene-ethylene-butene copolymer and an olefin elastomer having a melt index of 10g / 10min. 3-layer coextruded unstretched film that enables thermal adhesion and prints using polypropylene resin on the opposite layer (corona layer). 0.05 weight of anti-fogging surfactant is applied to the center layer and heat-adhesive layer of this film. % Prescription Anti-fogging non-stretched polypropylene film was prepared.

Comparative Example 2

Low temperature using 10% by weight of a propylene-ethylene-butene copolymer and an olefin elastomer having a melt index of 10g / 10min on one side of the surface layer (heat adhesive layer) as a center layer of polypropylene resin having a melt index of 7g / 10min. 3-layer coextruded unstretched film that is heat-bonded and corona-treated to allow printing using a polypropylene resin on the opposite layer (corona layer). 25.0 weight of anti-fogging surfactant is applied to the center layer and heat-adhesive layer of this film. An antifogging non-stretched polypropylene film was prepared by prescribing%.

Comparative Example 3

Low temperature using 1% by weight of propylene-ethylene-butene copolymer and olefin elastomer with 10g / 10min melt index on one side of the surface layer (heat adhesive layer) as the center layer of polypropylene resin with 7g / 10min melt index 3-layer coextruded unstretched film that enables heat adhesion and is printed with polypropylene resin on the opposite layer (corona layer) to enable printing. 1.0 weight of anti-fogging surfactant is applied to the center layer and heat adhesive layer of the film. An antifogging non-stretched polypropylene film was prepared by prescribing%.

Comparative Example 4

Low temperature using polypropylene resin with a melt index of 7g / 10min as the center layer and 55.0% by weight of propylene-ethylene-butene copolymer and olefin elastomer having a melt index of 10g / 10min on one side of the surface layer (heat adhesive layer) 3-layer coextruded unstretched film that enables heat adhesion and is printed with polypropylene resin on the opposite layer (corona layer) to enable printing. 1.0 weight of anti-fogging surfactant is applied to the center layer and heat adhesive layer of the film. An antifogging non-stretched polypropylene film was prepared by prescribing%.

Table 1 shows the results of comparing the antifogging property and the long-term persistence of the antifogging properties, heat adhesiveness and the breaking property of the films prepared according to Examples 1 to 4 and Comparative Examples 1, 2, 3, and 4. The anti-fogging property was put in a suitable amount of water in a paper cup, sealed with the film, and then refrigerated and observed for condensation according to time. The thermal adhesive property was used with a TOYOSEIKI thermal adhesive machine, and the breaking property was an oven at 40 ° C. 2 days at 20kg load

<Table 1> Comparison results of anti-fogging, heat adhesiveness and blocking properties

Fence wall Thermal adhesion Breaking property Immediately after packing After 5 minutes of refrigeration Example 1 No condensation No condensation Excellent thermal adhesiveness none Example 2 No condensation No condensation Excellent thermal adhesiveness none Example 3 No condensation No condensation Good thermal adhesion none Example 4 No condensation No condensation Good thermal adhesion none Comparative Example 1 No condensation Has condensation Excellent thermal adhesiveness none Comparative Example 2 No condensation No condensation Thermal Bondable Temperature Rise none Comparative Example 3 No condensation No condensation Heat adhesive temperature rise none Comparative Example 4 No condensation No condensation Excellent thermal adhesiveness Occur

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. Excessive or extremely small amounts of surfactants can be detrimental. Also, even when excessively low or special amounts of special cryogenic resins are used in an amount less than 1 to 50% by weight, thermal adhesion and breaking properties It can be seen that it has a bad effect.

The present invention is not limited to the above-described specific preferred embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

The anti-fogging low temperature heat-adhesive film for packaging agricultural products according to the present invention may be usefully used for agricultural products packaging requiring anti-fogging property and low-temperature heat adhesiveness at the same time having anti-fogging property and low temperature heat adhesiveness.

That is, the present invention is very excellent in the prevention of condensation and low temperature heat adhesion effect, so that water droplets do not form inside the packaging paper, so that the product looks fresh, and the product does not fall on the product to prevent deterioration of the product, and also heat adhesion at low temperature This makes it suitable for packaging films for agricultural products which can extend the life of packaging machines.

Claims (5)

In polypropylene film, An antifogging surfactant is blended at 0.1 to 20% by weight, and the polypropylene resin having a melt index of 3 to 10 g / 10 minutes is used as the center layer 11, The corona layer 12, which is one surface of the surface layer, is made of polypropylene resin having a melt index of 3 to 10 g / 10 minutes. On the other hand, the heat-adhesive layer 13 is composed of a polypropylene copolymer resin having a melt index of 5 to 12 g / 10 minutes and a blend of an antifogging surfactant of 0.1 to 20% by weight and a special low temperature resin of 1 to 50% by weight. Co-extruded non-stretched non-stretched low-temperature heat-adhesive polypropylene film (15) composed of co-extruded non-stretched film for packaging agricultural products with anti-fogging and low-temperature heat adhesiveness. The method of claim 1, The anti-fogging surfactant cobalt-free non-stretch film for packaging agricultural products with anti-fogging and low temperature heat adhesive, characterized in that at least one selected from the group consisting of sorbitan fatty acid esters, glycerin fatty acid esters, polyglycerol fatty acid esters. The method of claim 1, The polypropylene copolymer resin is one type selected from the group consisting of propylene-ethylene copolymers, propylene-butene copolymers, and propylene-ethylene-butene terpolymers, and has antifogging property and low temperature heat adhesiveness. Co-extruded unstretched film for packaging agricultural products. The method of claim 1, The polypropylene resin is a coextruded non-stretched film for packaging agricultural products with antifogging and low temperature heat adhesiveness, characterized in that it is one kind selected from the group consisting of a homo polypropylene resin, a polypropylene copolymer, or a mixture composition thereof. . The method of claim 1, The special low-temperature resin is co-extruded unstretched film for packaging agricultural products with anti-fogging and low temperature heat adhesive, characterized in that at least one selected from the group consisting of olefin elastomer, PET elastomer and RUBBER-based low temperature resin group.