KR102136002B1 - Packing film using environment-friendly ink and method of manufacturing the same - Google Patents

Abstract

Disclosed is a packaging material using eco-friendly ink and a method of manufacturing the same. The packaging material includes a first film, a first adhesive layer formed on the first film, and a second film formed on the first adhesive layer. Printing is made on one surface of the first film using an eco-friendly ink, the first adhesive layer is formed on the first film on which the printing is made, and the eco-friendly ink does not contain a VOC-regulating material, and includes resin, pigment, curing agent, and Contains solvents. Here, the solvent includes ethanol and propyl acetate (n-PAc).

Description

PACKING FILM USING ENVIRONMENT-FRIENDLY INK AND METHOD OF MANUFACTURING THE SAME}

The present invention relates to a packaging material using an eco-friendly ink and a method for manufacturing the same.

Conventional packaging materials were manufactured using Toluene, MEK, and EA, which are VOC-regulated substances, and as a result, may have a harmful effect on the human body.

KR200486159B

The present invention is to provide a packaging material using an eco-friendly ink and a method for manufacturing the same.

In order to achieve the above object, the packaging material using an eco-friendly ink according to an embodiment of the present invention comprises a first film; A first adhesive layer formed on the first film; And a second film formed on the first adhesive layer, printing is made on one surface of the first film using eco-friendly ink, and the first adhesive layer is formed on the first film on which the printing is performed, and the eco-friendly The ink does not contain VOC regulated substances, but resins, pigments, curing agents and solvents. Here, the solvent includes ethanol and propyl acetate (n-PAc).

A method of manufacturing a packaging material using eco-friendly ink according to another embodiment of the present invention comprises printing gravure using eco-friendly ink on a first film; Forming a first adhesive layer by applying an adhesive on the printed first film; And forming a second film on the first adhesive layer. Here, the eco-friendly ink does not contain a VOC regulating material, and includes a resin, a pigment, a curing agent, and a solvent, and the solvent includes ethanol and propyl acetate (n-PAc).

Since the packaging material according to the present invention is manufactured by using an ink that does not use a VOC-regulated material and using a solvent-free lamination, it is not harmful to the human body and is environmentally friendly.

1 is a block diagram showing the structure of a packaging material according to an embodiment of the present invention.
2 is a block diagram showing the structure of a packaging material according to another embodiment of the present invention.

As used herein, a singular expression includes a plural expression unless the context clearly indicates otherwise. In this specification, the terms "consisting of" or "comprising" should not be construed as including all of the various components, or various steps described in the specification, among which some components or some steps It may not be included, or it should be construed to further include additional components or steps. In addition, terms such as “... unit” and “module” described in the specification mean a unit that processes at least one function or operation, which may be implemented in hardware or software, or a combination of hardware and software. .

The present invention relates to an eco-friendly packaging material manufactured by combining environmentally friendly gravure printing and solvent-free lamination. Of course, printing is not limited to gravure printing.

Existing packaging materials used inks containing VOC regulated substances such as Toluene, MEK, and EA, and as a result, there is a risk of adversely affecting the human body. In addition, since methanol and EA organic solvents, which are VOC-regulated substances, are generally used as an adhesive component, it is not only harmful to the human body, but also may cause a problem that some methanol and EA residual solvents remain after lamination.

On the other hand, the ink used in the packaging material of the present invention uses eco-friendly ethanol and propyl acetate (n-PAc) rather than the VOC-regulating material, so the packaging material is not harmful to the human body.

In addition, since the method of manufacturing the packaging material of the present invention performs lamination using a solvent-free adhesive, it is environmentally friendly and can solve the problem of solvent remaining.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the structure of a packaging material according to an embodiment of the present invention.

Referring to FIG. 1, the packaging material of this embodiment may include a first film 100, an adhesive layer 102 and a second film 104.

Hereinafter, the structure and components of the packaging material will be described by dividing into a solvent-free 1-liquid type and a solvent-free 2-liquid type.

First of all, let's take a look at a one-pack type of solvent-free packaging material. The solvent-free one-pack type packaging material may be used as a packaging material for general bread.

The first film 100 is a film in which eco-friendly ink is gravure printed through a roll-to-roll method, and the first film 100 is oriented polypropylene (OPP) or polyethylene terephthalate as a first grade paper. , PET). On the other hand, in the solvent-free one-component lamination process, since moisture is used as a curing agent, NY may not be used because a moisture absorption problem may occur.

Here, the eco-friendly ink may be composed of a basic ink, a curing agent and a mixed solvent.

According to one embodiment, the eco-friendly ink may be prepared by preparing the basic ink, and then synthesizing the basic ink, the curing agent, and the mixed solvent in a specific ratio.

The base ink, the curing agent and the mixed solvent may have a mixing ratio of 15:1:7 to 16. For example, when printing colors other than white, the basic ink, the curing agent, and the mixed solvent may have a mixing ratio of 15:1:7, and when printing white, the basic ink, the curing agent, and the mixed solvent may be 15:1. It may have a mixing ratio of :16.

When the ratio of the diluting solvent is less than 7, the viscosity of the eco-friendly ink is high, so the color may be dark and printing blocking may occur.

When the ratio of the diluting solvent exceeds 16, the viscosity of the eco-friendly ink is low, so the color becomes lighter and the hiding power is lowered, which may cause the contents of the packaging material to shine.

According to one embodiment, the base ink may be made of a resin, a pigment, and a solvent. For example, the resin is a polyurethane resin, and the solvent may be ethanol and propyl acetate (n-PAc). That is, the solvent of the ink is not a VOC regulated substance.

Looking at the blending ratio, when the base ink is 100% by weight, the content of the polyurethane resin is 20% by weight to 30% by weight, and the content of the organic pigment or inorganic pigment as the pigment is 10% by weight to 30% by weight May be, the content of ethanol and propyl acetate as the solvent may be 40 to 70% by weight.

In another aspect, based on the curing agent, the polyurethane resin may have a weight ratio of 300 to 450 weight ratio, the pigment may have a weight ratio of 150 to 450 weight ratio, the solvent may have a weight ratio of 600 to 1050 weight ratio have.

In addition, the content ratio (combination ratio) of ethanol and propyl acetate in the solvent may be 1:1.5 to 1:2. On the other hand, only ethanol can be used as a solvent without propyl acetate. In this case, since the ink drying speed is slow, the printing speed must be lowered to work, the printing blocking is severe, and the water content is increased due to the characteristic of ethanol absorbing moisture, so that the printability due to the printing blocking may be further deteriorated. In addition, it is difficult to implement a desired color due to poor print cutability and a low color density as the flash point spreads, and a defect in melting the printed part in dry lamination and coating lamination using ethanol may occur. Therefore, in order to solve this problem, the solvent of the basic ink of the present invention is used in combination with ethanol and propyl acetate.

When the resin is less than 20% by weight, the adhesion of the eco-friendly ink is weak, and when it exceeds 30% by weight, the color of the eco-friendly ink is dimmed and it is difficult to reproduce a desired color.

Polyurethane resin as the resin can adhere to many materials, has little residual solvent, has good laminate processability, and also has excellent film performance such as resistance to water (oil, vinegar, fragrance), resistance to retort.

When the pigment is less than 10% by weight, the color of the eco-friendly ink is weakened, and when it exceeds 30% by weight, the color of the eco-friendly ink is too dark, making it difficult to reproduce a desired color.

The solvent is the rest of the composition excluding the resin and the pigment, and when the ratio of ethanol and propyl acetate is less than 1.5, the eco-friendly ink does not dry properly, so that ink is deposited on the guide roller. The drying of the ink is so fast that the eco-friendly ink is clogged in the copper cylinder cell, making it difficult to reproduce the eco-friendly ink in a desired color.

The curing agent is formulated in a 15:1 with the base ink, for example, the main component of the curing agent may be isocyanate (isocyanate).

The mixed solvent does not use a VOC regulating material, and may be made of, for example, ethanol, propyl acetate and cyclohexane (c-Hexane).

According to one embodiment, the ethanol, the propyl acetate and cyclohexane may have a mixing ratio of 1:1:0.5 to 1.5.

If the cyclohexane is less than 0.5 times, the drying of the eco-friendly ink is too fast, and the copper cylinder cylinder is clogged, making it difficult to reproduce the desired color.

When the cyclohexane exceeds 1.5 times, the eco-friendly ink is not properly dried, so that the eco-friendly ink is deposited on the guide roller.

The adhesive layer 102 is made of a solvent-free one-component adhesive that does not use an organic solvent, and may be made of 100% solids. In addition, since it is a moisture-curing type that realizes curing through humidification during lamination, it is possible to implement eco-friendly lamination. Of course, since the adhesive layer 102 uses a solvent-free one-component adhesive, the problem of residual solvent remaining can be solved.

The second film 104 is formed on a surface of the adhesive layer 102 opposite to the surface to which the first film 100 is adhered, and may be made of polypropylene non-oriented film (CPP) as a secondary paper.

Next, we will look at a two-solution type packaging material without solvent. The solvent-free two-component type packaging material can be used as a high-quality bread, cotton, noodles, wipes, etc., and has a higher bonding strength and a larger size than a solvent-free one-component type packaging material and can be used when a sterilizing product is required.

The eco-friendly ink of the packaging material has the same components as the eco-friendly ink of the solvent-free one-pack type packaging material.

The first film 100 may be made of stretched polypropylene (OPP), polyethylene terephthalate (PET), or NY as a primary paper, and the second film 104 may be a non-stretched film (CPP) as a secondary paper, or linear It may be made of low-density polyethylene (LLDPE: linear low density polyethylene).

The adhesive layer 102 may be a solvent-free two-component adhesive. Previously, EA organic solvent, which is a VOC-regulated material, was used, but the packaging material of the present invention is eco-friendly and does not leave a residual solvent because it uses a solvent-free two-component adhesive that does not use a solvent.

Hereinafter, the process of manufacturing the packaging material will be described.

First, the method of manufacturing the packaging material performs a gravure printing process using eco-friendly ink for the first film 100.

For example, after using the copper plate to contain the eco-friendly ink in the mesh, the remaining portion of unnecessary ink can be removed using a doctor blade and then compressed onto the first film 100 using a rubber roll to print. Here, the composition ratio of the eco-friendly ink is as described above.

When printing using eco-friendly ink, ink tearing phenomenon and ink adhesion to the guide roller may occur with significantly lower workability than printing using ink containing Toluene, MEK, and EA.

To solve this, the temperature, the air volume, and the copper plate manufacturing method were appropriately designed in order to enable drying of the printed surface in a short time.

Specifically, the temperature of the gravure printing apparatus drying chamber was increased by 5 to 10 degrees from the existing temperature. For example, primary color (black, blue, red, yellow) printing may be performed at a temperature of 60 degrees to 70 degrees, and multicolor (white, MATT, spot color) printing may be performed at a temperature of 70 degrees to 80 degrees.

Here, when the temperature was raised to less than 5 degrees, drying was not smoothly performed, and when the temperature was raised above 10 degrees, the first film 100 was deformed.

The air volume supplied to the drying box of the gravure printing apparatus was increased by 5% to 10% from the basic air volume. For example, the primary color (black, blue, red, yellow) printing may be performed under airflow conditions of 90CMM to 100CMM, and multicolor (white, MATT, spot color) printing may be performed under airflow conditions of 100CMM to 110CMM.

Here, when it is raised to less than 5%, drying was not smoothly performed, and when it is raised to more than 10%, the first film 100 may be shaken to cause defects in focus.

Meanwhile, a humidifying device may be additionally used to maintain a certain humidity during printing.

Existing copper plate has been mainly made of Helio, spot color and white laser, but changed to low-depth laser engraving method for the purpose of quick drying of printing surface and reduction of ink coating amount. It is possible to significantly reduce the occurrence of defects by drying the printed surface and maintain the existing production speed.

Subsequently, in the manufacturing method of the packaging material, an adhesive layer 102 is formed by applying an adhesive to the printed first film 100. Here, the adhesive may be a solvent-free adhesive.

In particular, for an eco-friendly process, the adhesive may be cured with a moisture curing type, and the solventless two-component adhesive may be cured with a solventless two-component curing agent.

Next, in the manufacturing method of the packaging material, the second film 104 is adhered to one surface of the adhesive layer 102. Here, the second film 104 is formed on a surface opposite to the surface to which the first film 100 is adhered among the adhesive layers 102. That is, the second film 104, the adhesive layer 102 and the first film 100 may be sequentially formed.

Through these steps, a packaging material using eco-friendly ink can be manufactured.

2 is a block diagram showing the structure of a packaging material according to another embodiment of the present invention.

Referring to FIG. 2, the packaging material of this embodiment includes a first film 200, a first adhesive layer 202, a second film 204, a second adhesive layer 206, and a third film 208. These packaging materials can be used as packaging materials for products that require barrier properties.

The first film 200 may be made of stretched polypropylene (OPP), polyethylene terephthalate (PET), or NY as a primary paper. Here, gravure printing may be performed on the first film 200, and the eco-friendly ink is the same as the eco-friendly ink in the embodiment of FIG. 1.

The first adhesive layer 202 may be formed by applying a solvent-free two-component adhesive to the printed first film 200.

The second film 204 is a secondary paper, and is formed on a surface of the first adhesive layer 202 opposite to the surface on which the first film 200 is formed, and has blocking properties.

According to one embodiment, the second film 204 may be made of an aluminum deposition film (Vacuum Metalized PolyEthylene Terephthalate Film, VMPET), EVOH (Ethylene Vinyl Alcohol), etc., but various materials may be used as long as it has a blocking property.

The second adhesive layer 206 may be formed by applying a solvent-free two-component adhesive to the second film 204.

The third film 208 is a three-layer paper, and may be formed on a surface of the second adhesive layer 206 opposite to the surface on which the second film 204 is formed.

According to one embodiment, the third film 208 may be made of polypropylene unstretched film (CPP), linear low density polyethylene (LLDPE), or the like.

In FIG. 2, the second film 204 and the third film 208 are formed as one layer, but the second film 204 and the third film 208 may be formed of a plurality of layers. When the second film 204 and the third film 208 are formed of a plurality of layers, each layer may be made of different materials.

The above-described embodiments of the present invention have been disclosed for purposes of illustration, and those skilled in the art having various knowledge of the present invention will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. It should be regarded as belonging to the following claims.

100; First film 102: adhesive layer
104: second film 200: first film
202: first adhesive layer 204: second film
206: 2nd adhesive layer 208: 3rd film

Claims (13)

A first adhesive layer formed on the first film; And
It includes a second film formed on the first adhesive layer,
Printing is made on one surface of the first film using an eco-friendly ink, the first adhesive layer is formed on the first film on which the printing is made, and the eco-friendly ink does not contain a VOC-regulated material, and includes resin, pigment, curing agent, and Contains solvent,
The solvent includes ethanol and propyl acetate (n-PAc),
When printing, the primary color printing is performed under the temperature of the drying chamber at 60°C to 70°C and the air volume condition of 90CMM to 100CMM, and the multi-color printing is performed under the temperature of the drying chamber at 70°C to 80°C and the air volume condition of 100CMM to 110CMM. Is performed, the copper plate for printing is manufactured by a low-depth laser engraving method,
A packaging material using an eco-friendly ink, characterized in that the mixing ratio of the ethanol and the propyl acetate is 1:1.5 to 1:2. According to claim 1, The eco-friendly ink is composed of a basic ink, the curing agent and a mixed solvent,
The basic ink is composed of a polyurethane resin, the pigment, and a solvent composed of the ethanol and the propyl acetate,
The curing agent is an isocyanate (isocyanate),
The mixed solvent is ethanol, propyl acetate and cyclohexane (c-Hexane), packaging material using an environmentally friendly ink, characterized in that consisting of. The method according to claim 2, wherein when the base ink is 100 weight percent, the polyurethane resin has 20 to 30 weight percent, the pigment has 10 to 30 weight percent, and the solvent has 40 to 40 weight percent. Packaging material using eco-friendly ink, characterized in that it has 70% by weight. delete The method of claim 3, wherein the base ink, the curing agent and the mixed solvent has a mixing ratio of 15:1:7 ~ 16,
The ethanol, the propyl acetate and the cyclohexane in the mixed solvent has a mixing ratio of 1:1:0.5 to 1.5 packaging material using eco-friendly ink. According to claim 2, based on the curing agent, the polyurethane resin has a weight ratio of 300 to 450, the pigment has a weight ratio of 150 to 450, and the solvent has a weight ratio of 600 to 1050 Packaging using eco-friendly ink. The method of claim 1, wherein the printing is gravure printing, the first adhesive layer is a solvent-free adhesive made of 100% solids without a solvent,
The solvent-free adhesive is a packaging material using an eco-friendly ink characterized in that it is cured through a moisture-curing type on the first film or a solvent-free two-liquid type curing agent on the first film. According to claim 1,
Further comprising a second adhesive layer formed on the second film,
The second film has a blocking property, the second adhesive layer is a solvent-free two-component adhesive packaging material using an environmentally friendly ink. Gravure printing using eco-friendly ink on the first film;
Forming a first adhesive layer by applying an adhesive on the printed first film; And
Comprising the step of forming a second film on the first adhesive layer,
The eco-friendly ink does not contain VOC-regulated substances, and includes resin, pigment, curing agent, and solvent, and the solvent includes ethanol and propyl acetate (n-PAc),
When printing, the primary color printing is performed under the temperature of the drying chamber at 60°C to 70°C and the air volume condition of 90CMM to 100CMM, and the multi-color printing is performed under the temperature of the drying chamber at 70°C to 80°C and the air volume condition of 100CMM to 110CMM. Is performed, the copper plate for printing is manufactured by a low-depth laser engraving method,
The mixing ratio of the ethanol and the propyl acetate is 1:1.5 ~ 1:2 method of manufacturing a packaging material using an eco-friendly ink, characterized in that. The method of claim 9, wherein the eco-friendly ink is prepared by preparing the basic ink and then mixing the curing agent and the mixed solvent with the basic ink.
The basic ink is composed of a polyurethane resin, the pigment and a solvent composed of the ethanol and the propyl acetate, and the curing agent is an isocyanate, and the mixed solvent is the ethanol, the propyl acetate and cyclohexane. (c-Hexane) packaging material manufacturing method using an eco-friendly ink, characterized in that consisting of. The method according to claim 10, wherein when the base ink is 100 weight percent, the polyurethane resin has 20 to 30 weight percent, the pigment has 10 to 30 weight percent, and the solvent has 40 to 40 weight percent. Has 70 weight percent,
The base ink, the curing agent and the mixed solvent have a mixing ratio of 15:1:7 to 16,
The ethanol, the propyl acetate and the cyclohexane in the mixed solvent has a mixing ratio of 1:1:0.5 to 1.5 packaging method using an environmentally friendly ink. delete The method of claim 9,
Forming a second adhesive layer on the second film; And
Forming a third film on the second adhesive layer,
The first adhesive layer is a solvent-free two-component adhesive composed of 100% of a solid agent without a solvent, the second film has a blocking property, the second adhesive layer is a solvent-free two-component adhesive, and the solvent-free two-component adhesives are a solvent-free two-component adhesive Packaging material manufacturing method using eco-friendly ink, characterized in that it is cured with a curing agent.

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