KR20210115230A - Eco-friendly packing material for ice pack and preparation thereof - Google Patents

Abstract

The present invention provides an eco-friendly packaging material for an ice pack, comprising an inner contact layer, an intermediate barrier layer and an outer layer, wherein the inner layer is selected from a group composed of a linear low-density polyethylene (LLDPE) film containing a biodegradation catalyst, a bio-based plastic film and a biodegradable plastic film, the intermediate layer is selected from a nylon film containing a biodegradation catalyst, the outer layer is selected from kraft paper having a basis weight of 35 g/m^2 or more, and the outer layer includes an eco-friendly printed layer and an anti-fogging or a water-repellent coating layer if necessary. The present invention provides an eco-friendly packaging material for an ice pack, which has no toxicity, does not denature the content, has a waterproof or a refrigerant barrier property and has excellent mechanical properties (tear resistance, etc.) even after repeated freezing and thawing, and also is degradable when a certain period has elapsed or under certain conditions.

Description

Eco-friendly packaging material for ice pack and manufacturing method thereof

The present invention relates to an eco-friendly packaging material for an ice pack and a manufacturing method thereof.

Ice packs are sealed with a refrigerant such as water or gel inside, and are used after freezing the refrigerant in the freezer. It is used to maintain the freshness of the food in question over time. After the ice pack is sealed, it is used without opening it until it is discarded, and maintenance of waterproofness and physical properties becomes an important key when using it for a long period of time.

In general, ice packs are used as a substitute for ice, and are used to keep these foodstuffs in a low temperature state by placing them with foodstuffs, such as seafood, meat, and vegetables, and are widely used because of their longer usage time and superior effect compared to ice.

These ice packs are filled with a refrigerant in the space, cooled and frozen in a sealed state, and then put together with the food in a box for storing and transporting the food to maintain the freshness of the food for a long time.

In general, the packaging material used for the manufacture of ice packs does not have a property of causing toxicity or denaturation to an external object to be cooled, must not be denatured by water or internal refrigerant, has waterproofness or refrigerant barrier properties, and has external impact It must be strong enough to withstand the high temperature and maintain sufficient durability for repeated freeze-thaw, but since there is no material that satisfies these properties, films of different materials are stacked in two or more layers to form a multi-layered film and used as a packaging material. use.

For example, as an example of an ice pack made of a two-layer film packaging material, a conventional ice pack has an upper surface portion and a lower surface portion attached to each other along its edges and forms a space portion in which a refrigerant is filled, and the upper surface portion and the The lower part has a double structure in which an inner layer made of polyethylene and an outer layer made of nylon are laminated, respectively.

In addition, an ice pack made of a three-layer film packaging material consists of three parts: an inner layer contacting the refrigerant, a barrier layer blocking the refrigerant and in some cases gas and oxygen, and an outer layer exposed to the outside or in contact with an external object. and the outer layer may further include a printed layer and a coating layer. Such a three-layer film packaging material, for example, may have a layer configuration such as PET/NY/LDPE, OPP/NY/LDPE, paper/Al Foil/LDPE.

Recently, as many environmental issues have been raised, demands for eco-friendliness, such as biodegradability, carbon reduction or recyclability, for ice pack packaging materials are emerging.

The existing multi-layer packaging material for ice packs uses petroleum-derived plastic products, and the multi-layer packaging material used here is difficult to biodegrade, not well separated and collected, and it is difficult to recycle even when separated and collected, and it is toxic when incinerated. Gas is generated and causes air pollution, and in the case of landfill, it causes a shortage of landfill space and environmental pollution.

In particular, it is known that it is almost impossible to recycle multi-layer packaging materials in which a polymer film (eg nylon film) is laminated or bonded to a metal layer (eg aluminum foil) for perfect waterproofing or refrigerant barrier properties.

In such a situation, as described above, it has no properties that cause toxicity or denaturation to external objects, must not be denatured by water or refrigerant, has waterproof or refrigerant barrier properties, and has excellent mechanical properties ( There is an urgent need for an eco-friendly packaging material for ice packs that has excellent tear resistance, etc.) and can maintain sufficient durability even after repeated freeze-thaw, and can be decomposed after a certain period of time or under certain conditions.

An object of the present invention is to have no toxicity or denaturation properties to external objects, waterproof or refrigerant barrier properties, excellent mechanical properties (tear resistance, etc.), and maintain durability even after repeated freeze-thaw, To provide an eco-friendly packaging material for ice packs that can be decomposed after a certain period of time or under certain conditions after use.

The problem to be solved by the present invention is not limited to the problem(s) mentioned above, and another problem(s) not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides an eco-friendly multi-layer packaging material for an ice pack comprising an inner layer, an intermediate layer and an outer layer,

The inner layer is a thermally bonding polymer film containing a biodegradation catalyst, and is selected from the group consisting of a linear low density polyethylene (LLDPE) film containing a biodegradation catalyst, a biobase plastic film, and a biodegradable plastic film,

The intermediate layer is a tear-resistant polymer film containing a biodegradation catalyst, and is selected from the group consisting of a nylon film, a polyester film, a high-density or medium-density polyethylene film, a polyurethane film, and a polyvinyl chloride film containing a biodegradation catalyst,

The outer layer provides an eco-friendly packaging material for ice packs, characterized in that selected from paper with a basis weight of 35 g/m ² or more, preferably 70 g/m ^{2 or more with a basis weight.}

According to an embodiment of the present invention, the biodegradation catalyst may be an acetyl carbamate metal salt selected from the group consisting of ferric acetyl carbamate, aluminum acetyl carbamate, and manganese acetyl carbamate, or a mixture thereof.

According to an embodiment of the present invention, the biodegradation catalyst may be included in an amount of 0.01 to 0.1% by weight based on the added film layer.

According to an embodiment of the present invention, the outer layer may be selected from kraft paper ^{having a basis weight of 70 to 200 g/m 2 .}

According to an embodiment of the present invention, the inner layer may have a thickness of 80 to 135 μm, and the intermediate layer may have a thickness of 10 to 50 μm, preferably 10 to 25 μm, more preferably 12 to 20 μm. can

According to an embodiment of the present invention, the inner layer and the intermediate layer may be bonded without solvent.

According to an embodiment of the present invention, the outer layer may further include one or more selected from the group consisting of an eco-friendly ink layer, a protective coating layer, and an anti-fogging or water-repellent coating layer.

In order to achieve the above object, the present invention provides a method for manufacturing an eco-friendly packaging material for an ice pack comprising the following steps:

(Step 1) preparing a thermally bonding polymer film containing a biodegradation catalyst as an inner layer, wherein the thermally bonding polymer film is selected from the group consisting of a linear low density polyethylene (LLDPE) film, a biobase plastic film, or a biodegradable plastic film can be;

(Step 2) preparing a tear-resistant polymer film containing a biodegradation catalyst as an intermediate layer, wherein the tear-resistant polymer film is a nylon film, a polyester film, a high-density or medium-density polyethylene film, a polyurethane film, and a polyvinyl chloride film may be selected from the group consisting of;

(Step 3) preparing as an outer layer a paper having a basis weight of 35 g/m ² or more, preferably a kraft paper having a basis weight of 70 to 200 g/m ^{2 ;} and

(Step 4) Laminating the thermally bonding polymer film prepared as the inner layer in step 1, the tear-resistant polymer film prepared as the intermediate layer in step 2, and the kraft paper prepared as the outer layer in step 3 by sequentially solvent-free bonding.

According to an embodiment of the present invention, the above-described manufacturing method may further include the following steps:

(Step 5) forming an eco-friendly ink layer on the outer layer;

(Step 6) forming a protective coating layer on the outer layer; or

(Step 7) Forming an anti-fogging or water-repellent coating layer on the outer layer.

According to an embodiment of the present invention, an eco-friendly ink layer and an anti-fogging or water-repellent coating layer may be formed on the outer layer.

According to the present invention, there is no toxicity or denaturing properties to external objects, it has waterproof or refrigerant barrier properties, has excellent mechanical properties (tear resistance, etc.), and can maintain durability even after repeated freeze-thaw, and use Afterwards, an eco-friendly packaging material for ice packs that can be decomposed after a certain period of time or under certain conditions is provided.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

Before describing the present invention in detail, the terms or words used in this specification should not be construed as being unconditionally limited to their ordinary or dictionary meanings, and in order for the inventor of the present invention to describe his invention in the best way It should be understood that the concepts of various terms can be appropriately defined and used, and further, these terms or words should be interpreted as meanings and concepts consistent with the technical idea of the present invention.

That is, the terms used herein are only used to describe preferred embodiments of the present invention, and are not used for the purpose of specifically limiting the content of the present invention, and these terms represent various possibilities of the present invention. It should be understood that the term has been defined with consideration in mind.

Also, in the present specification, it should be noted that, unless the context clearly indicates otherwise, the expression in the singular may include a plurality of expressions, and may include the meaning of the singular even if similarly expressed in plural. do.

In the case where it is stated throughout this specification that a component "includes" another component, it does not exclude any other component, but further includes any other component unless otherwise stated. It could mean that you can.

In addition, in the following, in describing the present invention, a detailed description of a configuration determined that may unnecessarily obscure the gist of the present invention, for example, a detailed description of the known technology including the prior art may be omitted.

A first object of the present invention is to provide an eco-friendly multi-layer packaging material for an ice pack comprising an inner layer, an intermediate layer and an outer layer,

The inner layer is a thermally bonding polymer film containing a biodegradation catalyst, and is selected from the group consisting of a linear low density polyethylene (LLDPE) film containing a biodegradation catalyst, a biobase plastic film, and a biodegradable plastic film,

The intermediate layer is a tear-resistant polymer film containing a biodegradation catalyst, and is selected from the group consisting of a nylon film, a polyester film, a high-density or medium-density polyethylene film, a polyurethane film, and a polyvinyl chloride film containing a biodegradation catalyst,

The outer layer is characterized in that it is selected from kraft paper.

(A) inner layer

In the present invention, the inner layer is a portion that directly surrounds water, ice, or refrigerant, and is located inside when manufactured in the form of a pouch or bag and exhibits water resistance, and may be referred to as an inner waterproof layer.

The inner waterproofing layer is preferably selected from polymers having heat-adhesive properties. For example, it is preferable to have heat-sealing properties or heat-adhesive properties such that air cannot pass through when heat is applied.

In the present invention, as the inner layer, linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), or polypropylene (PP) may be used, and preferably, a film made of linear low-density polyethylene may be used.

In the present invention, a biobased plastic film and a biodegradable plastic film may also be used as the inner layer.

Bio-based plastic refers to a plastic containing more than a certain amount of biomass, for example, sugar cane-derived bio-PE, bio-PP, and the like can be exemplified. Bio-based plastics have excellent carbon reduction effects and properties similar to those of conventional plastics. However, there is a disadvantage that it is not biodegradable, but this disadvantage can be solved by using a biodegradation catalyst.

Bio-degradable (or Bio-decomposable, BD) plastics are plastics that can be decomposed by microorganisms, for example, PLA (Polylactide), TPS (Thermoplastic Starch), PHA (Polyhydroxyalcanoate), PBA (Polybuthylene succinate) ), polyvinylalcohol (PVA), polycarprolacton (PCL), polyglycol acid (PGA), and aliphatic polyester (AP).

Since biodegradable plastics can be decomposed by microorganisms in nature, they have excellent biodegradability and excellent carbon reduction effect, but are expensive, have low physical properties, and may be decomposed during distribution. However, in the present invention, since it is in contact with the ice pack in a sterilized state in the pouch, the possibility of decomposition during distribution is low.

In the present invention, the thickness of the inner layer is not particularly limited, but may be selected from 80 to 135 μm.

The content of the biodegradation catalyst contained in the inner layer formed of the bio-based plastic may be selected from 0.01 to 1 wt%, preferably 0.02 to 0.5 wt%, more preferably 0.03 to 0.1 wt%, based on the base polymer of the inner layer. have.

(B) Interlayer

In the present invention, the intermediate layer protects and reinforces the inner waterproofing layer so that the inner waterproofing layer is not torn, punctured, or damaged by external stimuli (external force or heat), and in some cases, even when the inner waterproofing layer is torn, punctured, or damaged. Since it serves to temporarily store or prevent leakage of ice, water, and refrigerant inside, it may be referred to as an intermediate reinforcing layer.

The polymer that can be used as the intermediate layer has heat resistance, tear resistance and flexibility, and is not particularly limited as long as it has some degree of waterproofness.

The intermediate reinforcing layer that can be used in the present invention includes, for example, at least one base polymer film selected from the group consisting of a nylon film, a polyester film, a high-density or medium-density polyethylene film, a polyurethane film, and a polyvinyl chloride film, Those containing the above-described biodegradation catalyst in an amount of 0.01 to 1% by weight, preferably 0.02 to 0.5% by weight, more preferably 0.03 to 0.1% by weight relative to the base polymer may be used.

According to a variant of the present invention, the intermediate reinforcing layer includes, for example, at least one base polymer film selected from the group consisting of a nylon film, a polyester film, a high or medium density polyethylene film, a polyurethane film and a polyvinyl chloride film. For example, those containing a bio-derived material such as starch in an amount of 1 to 30% by weight, preferably 5 to 25% by weight, more preferably 10 to 20% by weight relative to the base polymer can be used.

According to another embodiment of the present invention, as the intermediate reinforcing layer, for example, a nylon film, a polyester film, a high-density or medium-density polyethylene film, a polyurethane film, and a polyvinyl chloride (PVC) film selected from the group consisting of In the at least one base polymer film, the biodegradation catalyst described above is included in an amount of 0.01 to 1% by weight, preferably 0.02 to 0.5% by weight, more preferably 0.03 to 0.1% by weight relative to the base polymer, and also starch or Those containing plant-based biomass such as cellulose in an amount of 1 to 30% by weight, preferably 5 to 25% by weight, more preferably 10 to 20% by weight relative to the base polymer may be used.

(C) outer layer

In general, it is essential that the outer layer of the packaging material is made of a material that protects the inner structure (ie, the inner layer and the intermediate layer) and does not have the property of being toxic or denaturing the external object to be cooled.

Furthermore, the outer layer of the packaging material for ice packs is required to have resistance to moisture condensing/freezing on the surface of the packaging material as well as resistance to changes in physical properties experienced during repeated freeze-thawing.

In the present invention, as the outer layer, a basis weight of 35 g/m ² or more, preferably 70 g/m ² or more, may be used, for example, old paper, Korean paper, kraft paper, white paper, thin paper or food paper. and the like, and preferably Protego (Protego®, Hansol Paper Co., Ltd.) having excellent oxygen barrier properties and moisture barrier properties.

According to an embodiment of the present invention, the outer layer ^{may be selected from kraft paper having a basis weight of 70 to 200 m 2} /g, preferably, it may be selected from kraft paper having a basis weight of 90 to 150 m ² /g. have. An appropriate basis weight of kraft paper may be selected in consideration of cost, printability, packaging characteristics, handling characteristics, and the like.

For example, when using a relatively high tear resistance such as a nylon film or a polyester film as the intermediate layer, the outer layer is 35 g/m ² or more, specifically 35 to 100 g/m ² , preferably 40 to Food paper having a basis weight of 90 g/m ^{2 may be used.}

In addition, when the tear resistance is relatively low, such as a polypropylene film, a high-density or medium-density polyethylene film, a polyvinyl chloride film, etc. as an intermediate layer, 70 g/m ² or more, specifically 70 to 200 g/m ² , preferably as an outer layer Kraft paper having a basis weight of 90 to 150 g/m ^{2 may be used.} However, it is preferable to select the paper used for the outer layer in consideration of cost, printability, packaging characteristics and handling characteristics.

In addition, in the present invention, the basis weight of the kraft paper used as the outer layer is important to be selected from the above-mentioned range, but may be adjusted as necessary. When the thickness of the intermediate layer and/or the inner layer is thicker than the above-mentioned range, the basis weight of the paper may be reduced below the above-mentioned range, and vice versa.

According to an embodiment of the present invention, the outer layer may further include at least one selected from the group consisting of an eco-friendly ink layer, a protective coating layer, an anti-fogging coating layer, and a water-repellant coating layer.

Specifically, the outer layer may be further provided with a protective layer for preventing damage (scratches, discoloration due to light, etc.) of the printed layer displaying the contents of the product and the outer layer.

The above-mentioned printing layer may be formed on a part or all of the outer layer, and it is preferable to use an eco-friendly printing ink, for example, water-based ink, EB curing ink, UV curing ink, and biodegradable ink may be used, preferably EB ink can be used.

(D) biodegradation catalyst

In the present invention, the biodegradation catalyst means an oxo biodegradable agent, and in nature, a complex decomposition action such as heat, light, enzyme, chemical reaction, etc. It is a substance that causes decomposition by microorganisms.

Plastics (also called oxidative biodegradable plastics) products containing biodegradation catalysts do not decompose under the conditions of daily use, but only under certain conditions. Decomposition is known to occur at 37°C or higher and humidity 85% or higher.

The biodegradation catalyst may be an acetyl carbamate metal salt selected from the group consisting of ferric acetyl carbamate, aluminum acetyl carbamate and manganese acetyl carbamate, or a mixture thereof.

In the present invention, such a biodegradation catalyst may be included in an amount of 0.01 to 1% by weight, preferably 0.02 to 0.7% by weight, more preferably 0.05 to 0.5% by weight relative to the base plastic.

In the present invention, other types or other types of "biodegradation catalysts" may be used or added. For example, unsaturated fatty acids may contribute to polymer decomposition by performing an auto-oxidation function of the polymer, and may be used in 1 to 5 parts by weight. In the case of less than 1 part by weight, the automatic oxidative decomposition function during decomposition of the polymer compound is weak, and when it exceeds 5 parts by weight, there is a possibility that the polymer properties may be weakened. As such unsaturated fatty acids, polyene fatty acids having two or more double bonds, such as oleic acid, linoleic acid, arachidonic acid, and linolenic acid, may be mentioned, and a mixture of alpha-linoleic acid and arachidonic acid may be preferably used.

As another example, sodium bicarbonate may serve to promote decomposition by helping the action of a plasticizer and a metal salt of plant biomass, and 1 to 5 parts by weight may be used. If less than 1 part by weight is used, the function may be weak, and there is a problem that foaming may occur when used in excess of 5 parts by weight.

According to an embodiment of the present invention, the inner layer is a linear low density polyethylene (LLDPE) film containing a biodegradation catalyst, and the middle layer contains a biodegradation catalyst and is selected from the group consisting of nylon, high or medium density polyethylene and polyurethane. or more polymer film, and the outer layer may be kraft paper having a ^{basis weight of 70 g/m 2 or more.}

According to an embodiment of the present invention, the inner layer may be selected from a thickness of 80 to 135 μm, and the intermediate layer may be selected from a thickness of 10 to 50 μm, preferably from 12 to 25 μm, more preferably from 12 to 20 μm. can

According to an embodiment of the present invention, the adhesion of the inner layer and the intermediate layer and the adhesion of the intermediate layer and the outer layer may be performed in a solvent-free manner, for example, a solvent-free epoxy-based adhesive, a solvent-free urethane-based adhesive, and a solvent-free acrylic-based adhesive. It may be carried out using an adhesive or the like.

A second object of the present invention is to provide a method for manufacturing the above-described eco-friendly packaging material for an ice pack, comprising the following steps:

(Step 1) preparing a thermally bonding polymer film containing a biodegradation catalyst as an inner layer, wherein the thermally bonding polymer film is selected from the group consisting of a linear low density polyethylene (LLDPE) film, a biobase plastic film, or a biodegradable plastic film can be;

(Step 2) preparing a tear-resistant polymer film containing a biodegradation catalyst as an intermediate layer, wherein the tear-resistant polymer film is a nylon film, a polyester film, a high-density or medium-density polyethylene film, a polyurethane film, and a polyvinyl chloride film may be selected from the group consisting of;

(Step 3) preparing as an outer layer a paper having a basis weight of 35 g/m ² or more, preferably a kraft paper having a basis weight of 70 to 200 g/m ^{2 ;} and

(Step 4) Laminating the thermally bonding polymer film prepared as the inner layer in step 1, the tear-resistant polymer film prepared as the intermediate layer in step 2, and the kraft paper prepared as the outer layer in step 3 by sequentially solvent-free bonding.

According to an embodiment of the present invention, the eco-friendly packaging material for an ice pack of the present invention can be manufactured by a method comprising the following steps:

(Step 1a) preparing a linear low density polyethylene (LLDPE) film containing a biodegradation catalyst as an inner layer;

(Step 2a) as an intermediate layer, preparing a nylon film, a high-density or medium-density polyethylene film, or a polyurethane film containing a biodegradation catalyst;

(Step 3a) as an outer layer, preparing a kraft paper having a ^{basis weight of 70 g/m 2 or more;}

(Step 4a) A nylon film, a high-density or medium-density polyethylene film, a polyurethane film, or a polyvinyl chloride film containing a biodegradation catalyst prepared as an intermediate layer in step 2a is solvent-free bonded to the kraft paper prepared as an outer layer in step 3a, Solvent-free bonding of a linear low-density polyethylene (LLDPE) film containing a biodegradation catalyst prepared as an inner layer in step 1a here.

In the present invention, when a high-density or medium-density polyethylene film or polypropylene film is used as the intermediate layer, the inner layer film and the intermediate layer film may be oriented or stretched perpendicularly to each other.

According to an embodiment of the present invention, an eco-friendly packaging material for an ice pack can be manufactured using a linear low-density polyethylene film containing a biodegradation catalyst as an inner layer and a nylon film containing a biodegradation catalyst as an intermediate layer.

According to an embodiment of the present invention, the outer layer may further include one or more selected from the group consisting of an eco-friendly ink layer, a protective coating layer, an anti-fogging coating layer, and a water-repellent coating layer.

Accordingly, according to an embodiment of the present invention, the above-described manufacturing method may further include the following steps:

(Step 5) forming an eco-friendly ink layer on the outer layer;

(Step 6) forming a protective coating layer on the outer layer; or

(Step 7) Forming an anti-fogging or water-repellent coating layer on the outer layer.

According to an embodiment of the present invention, an eco-friendly ink layer and an anti-fogging or water-repellent coating layer may be formed on the outer layer.

In the present invention, the anti-fogging or water-repellent coating layer is not particularly limited as long as it can exhibit anti-fogging and/or water repellency, and may be formed using a silicone-based or inorganic material, and a commercially available product may be used. The anti-fogging or water-repellent coating layer may be formed, for example, with a thickness of 5 to 25 μm, preferably 10 to 20 μm, and if the thickness is too thick, economical efficiency is deteriorated, and if the thickness is too thin, sufficient effect is exhibited. It can be difficult.

In the present invention, paraffin wax may be used as an anti-fogging or water-repellent coating, but preferably a biodegradable polymer material having excellent film-forming ability, for example, SC (sodium caseinate), PVA (polyvinyl alcohol), PLA (poly lactic acid) ) can be used.

The above-mentioned eco-friendly printing layer may be formed on a part or all of the outer layer, for example, an eco-friendly printing ink selected from water-based ink, EB 　 curing ink, UV 　 curing ink, 　 biodegradable ink, etc. may be used, preferably EB curing inks may be used.

According to an embodiment of the present invention, the bonding may be performed in a solvent-free manner.

The water permeability of the eco-friendly packaging material for ice packs manufactured according to the present invention is ^{greatly reduced compared to that of the conventional multi-layer packaging material of 10 to 20 g/m 2} ·day, so that it is 10 g/m ² ·day or less, preferably 7 g/m ² ·day or less, more preferably 5 g/m ² ·day or less, thus exhibiting very high moisture barrier properties.

This low moisture barrier property is significantly improved compared to the existing multi-layer film packaging material for ice packs, which shows the excellent effect of the present invention.

Hereinafter, the present invention will be described in more detail through examples. However, the following examples are provided to explain the present invention in more detail, and the scope of the present invention is not limited by the following examples. The following examples can be appropriately modified and changed by those skilled in the art within the scope of the present invention.

Example

Example 1A (Production of 3-layer packaging material of food paper/PVC film/LLDPE film)

Ferric acetyl carbamate as a biodegradation catalyst was added to polyvinyl chloride (PVC, manufacturer: Hanwha Chemical) in an amount of 0.2 wt %, and a film having a thickness of 12 to 14 μm was prepared.

The prepared PVC film was solvent-free laminated on food paper (trade name: Norooji, manufacturer: Hansol Paper) having a basis weight of about 35 g/m ^{2 .}

On the two-layer structure of the food paper/PVC film, a 50-80 μm linear low-density polyethylene film (LLDPE film) containing ferric acetylcarbamate in an amount of 0.1 wt% as a biodegradation catalyst is laminated and solvent-free laminated, A three-layer structure packaging material of /PVC film/LLDPE film was obtained.

The basis weight, thickness, tensile strength and moisture permeability of the obtained multilayer packaging material were measured, and the results are shown in Table 1.

Example 1B (Preparation of three-layer packaging material of food paper/PVC film/BB film)

Food paper/PVC film/food paper/PVC film/ A three-layer structure packaging material of a BB film was prepared.

The basis weight, thickness, tensile strength and moisture permeability of the obtained packaging material were measured, and the results are shown in Table 1.

Example 1C (Production of 3-layer packaging material of food paper/PVC film/BD film)

Food paper/PVC film was carried out in the same manner as in Example 1A except that a biodegradable plastic film (BD film) was used in a thickness of 50 to 80 μm instead of a linear low density polyethylene film (LLDPE film) as the inner contact layer. A three-layer structure packaging material of /BD film was prepared.

The basis weight, thickness, tensile strength and moisture permeability of the obtained multilayer packaging material were measured, and the results are shown in Table 1.

Example 1A Example 1B Example 1C outer layer food paper
(Basic weight about 35g/m ² ) left left mezzanine PVC film
(thickness 12-14㎛) left left inner layer LLDPE film
(thickness 50-80㎛) biobased plastic film
(thickness 50-80㎛) biodegradable plastic film
(thickness 50-80㎛) Physical properties of the 3-layer packaging material basis weight (g/m ² ) 102.9-135.5 102.9-135.5 102.9-135.5 Thickness (㎛) 95~126 95~126 95~126 Tensile strength (MD) (kg/mm ² ) 71.0±7.0 69.0±1.0 67.0±7.0 Tensile strength (TD) (kg/mm ² ) 69.0±7.0 64.0±7.0 63.0±7.0 Water permeability (MVTR)
g/m2.day (38℃, 90%RH) 3.8 3.9 4.3

As shown in Table 1, the three-layered packaging material of the paper-film-film prepared in Examples 1A to 1C had a water permeability of ^{less than 4.5 g/m 2} ·day and a tensile strength of MD and TD of 60 kg/mm ² From the above, it can be seen that it is suitable as an eco-friendly packaging material for ice packs.

Example 2A (Production of 3-layer packaging material of kraft paper / NY film / LLDPE film)

Ferric acetyl carbamate as a biodegradation catalyst was added to nylon (trade name: CNB01, manufacturer: Kolon Industries) in an amount of 0.2 wt %, and a film having a thickness of 12 to 24 μm was prepared.

The prepared nylon film (NY film) was laminated without solvent on kraft paper having a basis weight of about 70 g/m ^{2 .}

A linear low-density polyethylene film (LLDPE film) having a thickness of 50 to 80 μm containing ferric acetyl carbamate as a biodegradation catalyst in an amount of 0.1% by weight is laminated on the two-layer structure of the kraft paper / NY film, and solvent-free lamination, A three-layer structure packaging material of kraft paper/NY film/LLDPE film was obtained.

The basis weight, thickness, tensile strength and moisture permeability of the obtained multilayer packaging material were measured, and the results are shown in Table 2.

Example 2B (production of three-layer packaging material of kraft paper/NY film/BB film)

Food paper / NY film / BB in the same manner as in Example 2A except that a bio-based plastic film (BB film) was used in a thickness of 50 to 80 μm instead of a linear low-density polyethylene film (LLDPE film) as an inner layer A three-layer structure packaging material of the film was prepared.

The basis weight, thickness, tensile strength and moisture permeability of the obtained packaging material were measured, and the results are shown in Table 2.

Example 2C (Preparation of 3-layer packaging material of kraft paper/NY film/BD film)

Food paper/NY film in the same manner as in Example 2A, except that a biodegradable plastic film (BD film) was used in a thickness of 50 to 80 μm instead of a linear low-density polyethylene film (LLDPE film) as the inner contact layer. A three-layer structure packaging material of /BD film was prepared.

The basis weight, thickness, tensile strength and moisture permeability of the obtained multilayer packaging material were measured, and the results are shown in Table 2.

Example 2A Example 2B Example 2C outer layer kraft paper
(Basic weight about 70g/m ² ) left left middle barrier layer NY film
(thickness 12-14㎛) left left inner contact layer LLDPE film
(thickness 50-80㎛) biobased plastic film
(thickness 50-80㎛) biodegradable plastic film
(thickness 50-80㎛) Physical properties of the 3-layer packaging material basis weight (g/m ² ) 125~155 125~155 125~155 Thickness (㎛) 117-145 117-145 117-145 Tensile strength (MD) (kg/mm ² ) 72.0±7.0 68.0±1.0 67.0±7.0 Tensile strength (TD) (kg/mm ² ) 71.0±7.0 65.0±7.0 64.0±7.0 Water permeability (MVTR)
g/m2.day (38℃, 90%RH) 4.07 3.97 4.25

As shown in Table 2, the three-layered packaging material of the paper-film-film prepared in Examples 2A to 2C had a water permeability of ^{less than 4.5 g/m 2} ·day and a tensile strength of MD and TD of 60 kg/mm ² It is superior to the above, and it can be seen that it is suitable as an eco-friendly packaging material for ice packs.

Examples 3A-3C

In the same manner as in Examples 2A to 2C, respectively, except that high-density polyethylene (trade name: FL7000, manufacturer: Lotte Chemical) was used instead of nylon as an intermediate layer, kraft paper / HDPE film / LLDPE film, kraft paper / HDPE film /BB film and kraft paper/HDPE film/BD film were prepared, respectively.

At this time, the orientation of the intermediate layer HDPE film and the inner layer LLDPE film was prepared to be vertically laminated.

The basis weight, thickness, tensile strength and moisture permeability of the obtained multilayer packaging material are shown in Table 3, and each value is almost similar to that of the three-layer film obtained in Examples 2A to 2C, indicating that it is suitable as an eco-friendly packaging material for ice packs. .

Example 3A Example 3B Example 3C outer layer kraft paper
(Basic weight about 80g/m ² ) left left middle barrier layer LLDPE film
(thickness 20-24㎛) left left inner contact layer LLDPE film
(thickness 50-80㎛) biobased plastic film
(thickness 50-80㎛) biodegradable plastic film
(thickness 50-80㎛) Physical properties of the 3-layer packaging material basis weight (g/m ² ) 130-165 135-165 135-165 Thickness (㎛) 127~155 127~155 127~155 Tensile strength (MD) (kg/mm ² ) 68.0±7.0 65.0±1.0 65.0±7.0 Tensile strength (TD) (kg/mm ² ) 67.0±7.0 62.0±7.0 63.0±7.0 Water permeability (MVTR)
g/m2.day (38℃, 90%RH) 3.61 3.86 3.44

As shown in Table 3, the three-layered packaging material of the paper-film-film prepared in Examples 3A to 3C had a moisture permeability of ^{less than 4 g/m 2} ·day and a tensile strength of MD and TD of 60 kg/mm ² From the above, it can be seen that it is suitable as an eco-friendly packaging material for ice packs.

Although specific embodiments of the eco-friendly packaging material for an ice pack according to the present invention and a method for manufacturing the same have been described so far, it is obvious that various implementation modifications are possible without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the following claims as well as the claims and equivalents.

That is, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims; All changes or modifications derived from the concept of equivalents thereof should be construed as being included in the scope of the present invention.

Claims (10)

An eco-friendly multi-layer packaging material for ice packs comprising an inner layer, an intermediate layer and an outer layer,
The inner layer is selected from the group consisting of a linear low-density polyethylene (LLDPE) film containing a biodegradation catalyst, a biobased plastic film, and a biodegradable plastic film,
The intermediate layer is selected from the group consisting of a nylon film containing a biodegradation catalyst, a polyester film, a high-density or medium-density polyethylene film, a high-density or medium-density polypropylene film, a polyurethane film, and a polyvinyl chloride film,
The outer layer is characterized in that selected from paper with a basis weight of 35 g / m ^{2 or more,}
Eco-friendly multi-layer packaging for ice packs.
The method of claim 1,
The biodegradation catalyst is an acetyl carbamate metal salt selected from the group consisting of ferric acetyl carbamate, aluminum acetyl carbamate and manganese acetyl carbamate, or a mixture thereof,
Eco-friendly packaging for ice packs.
According to claim 1,
The biodegradation catalyst is characterized in that it is included in an amount of 0.01 to 0.1% by weight based on the added polymer film layer,
Eco-friendly packaging for ice packs.
According to claim 1,
The outer layer is characterized in that selected from kraft paper with a basis weight of 70 g / m ^{2 or more,}
Eco-friendly packaging for ice packs.
5. The method of claim 4,
The inner layer has a thickness of 80 to 135㎛,
The intermediate layer is characterized in that it has a thickness of 10 to 50㎛,
Eco-friendly packaging for ice packs.
According to claim 1,
The inner contact layer and the intermediate blocking layer are characterized in that solvent-free bonding,
Eco-friendly packaging for ice packs.
According to claim 1,
The outer layer is characterized in that it further comprises one or more layers selected from the group consisting of an eco-friendly ink layer, a protective coating layer, an anti-fogging coating layer and a water-repellent coating layer,
Eco-friendly packaging for ice packs.
(Step 1) preparing a thermally bonding polymer film containing a biodegradation catalyst as an inner layer, wherein the thermally bonding polymer film is selected from the group consisting of a linear low density polyethylene (LLDPE) film, a biobase plastic film, or a biodegradable plastic film can be;
(Step 2) preparing a tear-resistant polymer film containing a biodegradation catalyst as an intermediate layer, wherein the tear-resistant polymer film is a nylon film, a polyester film, a high-density or medium-density polyethylene film, a high-density or medium-density polypropylene film, may be selected from the group consisting of polyurethane films and polyvinyl chloride films;
(Step 3) preparing kraft paper as an outer layer;
(Step 4) Laminating the thermally bonding polymer film prepared as the inner layer in Step 1, the tear-resistant polymer film prepared as the intermediate layer in Step 2, and the kraft paper prepared as the outer layer in Step 3 sequentially by solvent-free bonding; ,
A method of manufacturing an eco-friendly packaging material for ice packs.
9. The method of claim 8, comprising the steps of:
(Step 5) forming an eco-friendly ink layer on the outer layer;
(Step 6) forming a protective coating layer on the outer layer; or
(Step 7) forming an anti-fogging coating layer or a water-repellent coating layer on the outer layer; further comprising one or more steps of
A method of manufacturing an eco-friendly packaging material for ice packs.
10. The method of claim 9,
Characterized in forming an eco-friendly ink layer and an anti-fogging coating layer on the outer layer,
A method of manufacturing an eco-friendly packaging material for ice packs.