KR102610576B1 - Manufacturing method of food packaging paper using infrared heat treatment - Google Patents

Abstract

The present invention relates to a method of manufacturing food packaging, and more specifically, by printing using an eco-friendly ink composition on a substrate and performing infrared heat treatment, it has excellent barrier properties such as water resistance and oil resistance, and has excellent printability and food It relates to a method of manufacturing food packaging that effectively prevents deformation and damage to the packaging due to temperature or external factors.

Description

Manufacturing method of food packaging paper using infrared heat treatment}

The present invention relates to a method of manufacturing food packaging, and more specifically, by printing using an eco-friendly ink composition on a substrate and performing infrared heat treatment, it has excellent barrier properties such as water resistance and oil resistance, and has excellent printability and food It relates to a method of manufacturing food packaging that effectively prevents deformation and damage to the packaging due to temperature or external factors.

Food packaging includes, for example, various foods such as fried foods, breads, and snacks; beverage; ice cream; It is a container that holds the contents inside and wraps or seals it, allowing the user to consume the contents hygienically and conveniently.

Typically, food packaging and containers are usually made of materials based on polymer resins such as polyethylene (PE) and polyethylene terephthalate (PET). These materials have the great advantages of excellent barrier function and low price. It is still the most widely used to this day.

However, polymer resin (plastic), the main component of food packaging, is recognized as one of the biggest causes of environmental pollution due to problems with disposal after use. Polyethylene (PE) is generally a low-cost material with excellent food hygiene, elongation, and processability. It is coated on the inside of various food packaging and used for purposes such as waterproofing. However, coated paper using it is exposed to plasticizers added to plastic during use and disposal. There is a risk of releasing environmental hormones that are harmful to the human body. In addition, polyethylene coated paper has the disadvantage of increasing recycling costs because polyethylene, which does not dissociate in water, must undergo a separate screening process during the dissociation process for recycling after use. Accordingly, the continuous import of pulp for packaging paper production is required, which wastes foreign currency and exposes limitations in terms of recycling of resources.

Accordingly, recently, a variety of paper-based food packaging materials have been developed to meet social demands for eco-friendliness. However, due to the nature of the material, paper-based food packaging has a chronic problem of lower barrier properties such as water resistance and oil resistance compared to plastic materials.

In particular, in the case of packaging for instant food such as fried foods, bread, snacks, etc., it is used to hold the packaging temporarily containing food with the hand in order to make it convenient to consume the food right away rather than storing the contents for a long period of time. In most cases, Therefore, when using paper-based packaging, problems such as easily being deformed or damaged due to the temperature of the food or external factors more easily occur.

On the one hand, the concept of food packaging in modern society not only has basic physical properties including barrier properties, but also expresses colors, patterns, and designs in a variety of ways through printing on the outer surface of the packaging to inspire consumers' desire to consume and appetite. A function to do so is also included. In other words, in modern consumer culture, the demand for qualitative improvement in the functionality of food packaging is increasing.

Therefore, in food packaging based on paper with excellent environmental friendliness, a printing layer is formed on one side, which reduces the risk to the human body caused by residual solvents contained in printing ink, improves printability, and provides an excellent barrier. In-depth research is required on manufacturing methods for food packaging that can secure both characteristics.

Republic of Korea Patent Publication No. 10-2013-0069253

The present invention is intended to solve the above problems. By printing using an eco-friendly ink composition on a paper-based substrate and performing infrared heat treatment, it has excellent barrier properties such as water resistance and oil resistance, as well as excellent printability. The aim is to provide a method of manufacturing food packaging that can effectively prevent deformation and damage to the packaging due to food temperature or external factors.

The above and other objects and advantages of the present invention will become apparent from the following description of preferred embodiments.

The above object includes preparing a substrate; Performing pretreatment on both sides of the substrate to form a pretreated substrate layer; Preparing an eco-friendly ink composition comprising resin, pigment, water-soluble solvent, and additives; forming a printing layer by applying the eco-friendly ink composition on one side of the pretreated base layer; performing infrared heat treatment by irradiating infrared rays to the printed layer; and performing cooling after heat treatment. This can be achieved by a method of manufacturing food packaging, including.

The infrared heat treatment is performed using an infrared irradiation device equipped with an infrared lamp, and is characterized in that the heat treatment is performed at a temperature of 680 to 720°C. The distance between the infrared lamp and the printing layer is maintained at 13 to 17 cm.

The base material is paper, and the paper includes coated paper such as art paper, sc Manila paper, Ivory Manila paper, Royal Ivory Manila paper, and CCP (Cast Coated Paper); Uncoated paper such as white paper, corrugated paper, kraft paper, corrugated paper and manila paper; or one selected from a combination thereof.

The pretreatment is characterized as corona treatment or plasma treatment.

The eco-friendly ink composition is characterized by further comprising 1 to 6 parts by weight of a water-soluble antibacterial agent and 1 to 4 parts by weight of a far-infrared radiating material, based on 100 parts by weight of the composition.

The far-infrared ray emitting material may be any one selected from the group consisting of kaolin, germanium, red clay, elvanite, bioceramics, illite, mica, and feldspar, or a mixture of two or more.

The cooling is characterized by rapid cooling for 30 seconds to 3 minutes by spraying cooling wind at -10 to 10°C using a cooling device.

According to the present invention, by printing using an eco-friendly ink composition on a substrate and performing infrared heat treatment to manufacture food packaging, it has excellent barrier properties such as water resistance and oil resistance, heat sealability, and printability, and has excellent heat sealability and printability, and can It can effectively prevent deformation and damage to packaging due to adverse factors.

In addition, by using a paper-based substrate and an eco-friendly ink composition, it is possible to obtain eco-friendly food packaging that is easy to recycle (recycle), thereby ensuring both disposable convenience and eco-friendliness, thereby protecting the environment as well as the food industry. It can also contribute greatly to this aspect.

However, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

Figure 1 is a flow chart showing a method of manufacturing food packaging according to an embodiment of the present invention.
Figure 2 is a photograph showing food packaging produced according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments of the present invention and drawings. These examples are merely presented as examples to explain the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples. .

Additionally, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains, and in case of conflict, this specification including definitions The description will take precedence.

In order to clearly explain the proposed invention in the drawings, parts unrelated to the description have been omitted, and similar reference numerals have been assigned to similar parts throughout the specification. And, when it is said that a part "includes" a certain component, this means that it does not exclude other components, but may further include other components, unless specifically stated to the contrary. Additionally, “unit” as used in the specification refers to a unit or block that performs a specific function.

Identification codes (first, second, etc.) for each step are used for convenience of explanation. The identification codes do not describe the order of each step, and each step does not clearly state a specific order in context. It may be carried out differently from the order specified above. That is, each step may be performed in the same order as specified, may be performed substantially simultaneously, or may be performed in the opposite order.

In the present invention and this specification, “food packaging” may refer to packaging materials for instant foods such as fried foods, breads, snacks, snacks, ham, sausages, hot bars, fish cakes, etc., but the type of food is greatly limited. It doesn't work.

Hereinafter, implementation examples and examples of the present application will be described in detail with reference to the attached drawings. However, the present disclosure may not be limited to these implementations, examples, and drawings.

One aspect of the present application includes preparing a substrate; Performing pretreatment on both sides of the substrate to form a pretreated substrate layer; Preparing an eco-friendly ink composition comprising resin, pigment, water-soluble solvent, and additives; forming a printing layer by applying the eco-friendly ink composition on one side of the pretreated base layer; performing infrared heat treatment by irradiating infrared rays to the printed layer; It provides a method of manufacturing food packaging, including the step of performing cooling after heat treatment.

First, a method of manufacturing food packaging according to an embodiment of the present application can be explained through Figure 1.

First, the substrate can be prepared. The substrate may be paper-based. Specifically, the type of paper to be used as the substrate is not greatly limited as long as it is commonly used in the food packaging field.

Materials for the base include, for example, art paper, sc Manila paper, Ivory Manila paper, Royal Ivory Manila paper, and coated paper such as CCP (Cast Coated Paper); Uncoated paper such as white paper, corrugated paper, kraft paper, corrugated paper and manila paper; Or it may be any one selected from a combination thereof. For example, kraft paper can be used as the material for the above base material.

Second, pretreatment may be performed on both sides of the substrate to form a pretreated substrate layer. When the above pretreatment is performed, the surface of the substrate is physically and chemically modified to improve adhesion to the coating composition and/or ink composition to be described later and printability. The pretreatment may be corona treatment or plasma treatment, and specific methods may follow conventional techniques.

A film layer can be formed on one side of the pretreated base layer. The film layer is a surface that comes into direct contact with the contents (food) and can exhibit barrier properties such as water resistance, oil resistance, moisture resistance, and slip properties.

The method of forming the film layer may be to apply a water-soluble resin composition, dry it to form a coating layer, and later heat-treat the coating layer to complete the film layer. For example, the water-soluble resin composition may be a water-soluble acrylic polyurethane coating solution. Specifically, the coating solution may be prepared by adding an acrylic monomer and an initiator to polyurethane dispersed in distilled water and stirring.

The water-soluble resin composition may contain functional ingredients. The functional ingredient may include a water-soluble antibacterial agent and a far-infrared ray emitting material. The functional ingredient removes various harmful gases and harmful bacteria that may be generated in the coating layer and exerts a deodorizing effect, thereby enabling the production of cleaner and more eco-friendly packaging paper.

The functional ingredient is the same as the functional ingredient included in the “eco-friendly ink composition” to be described later, and will be described in more detail later. The water-soluble antibacterial agent is preferably included in an amount of 1 to 5 parts by weight, for example, 3 parts by weight, based on 100 parts by weight of the water-soluble resin composition. The far-infrared ray emitting material is preferably included in an amount of 1 to 5 parts by weight, for example, 2 parts by weight, based on 100 parts by weight of the water-soluble resin composition.

The application amount per application may be, for example, 1 to 5 g/m ² , specifically 2 to 5 g/m ² , and preferably 3 g/m ² , and the application may be performed 1 to 3 times. It can be performed once, preferably twice in succession.

The drying is performed quickly, in 1 to 5 minutes, using a hot air device. The drying is performed only to the extent of lightly hardening by removing the moisture contained in the coating layer, and the film layer is later completed through heat treatment. The heat treatment will be described in more detail later.

In another embodiment, when manufacturing the food packaging, the formation of the film layer may be omitted.

Third, an eco-friendly ink composition can be prepared. The ink composition does not use VOC-regulated substances and can ensure environmental friendliness by using a water-soluble solvent.

The ink composition may include resin, pigment, water-soluble solvent, and additives.

The resin serves to color the ink composition when forming the printing layer. The resin may be at least one selected from the group consisting of vinyl resin, epoxy resin, alkyd resin, amide resin, acrylic resin, and acetyl cellulose. For example, the resin may be a vinyl-based resin, such as vinyl chloride-isobutyl vinyl ether copolymer, ethylene-vinyl acetate copolymer, or a combination thereof. You can use it.

The resin is preferably included in an amount of 5 to 15 parts by weight based on 100 parts by weight of the ink composition. If the resin is included in less than 5 parts by weight, pigment precipitation may occur or printability may be reduced, and if it exceeds 15 parts by weight, manufacturing costs may increase, which may reduce economic efficiency, and the viscosity of the ink composition may increase, making printing difficult. Efficiency may decrease.

The pigment serves as a colorant and may include organic pigments, inorganic pigments, etc.

Specific examples of the pigment may include general materials commonly used in the field. For example, the pigment may be azo-lake, condensed azo, phthalocyanine, titanium oxide, carbon black, etc., but is not limited thereto. The pigment is preferably included in an amount of 10 to 40 parts by weight based on 100 parts by weight of the ink composition.

The water-soluble solvent may be any one selected from ethanol, water, or a combination thereof. The ethanol is not a toxic substance, has a carbon dioxide reduction effect, and has the advantage of preventing residual solvents from remaining on food packaging.

The additive may include additive components commonly used in the field, such as film reinforcing agents, anti-blocking agents, anti-static agents, anti-foaming agents, adhesion reinforcing agents, heat-resisting reinforcing agents, and transferability improving agents.

For example, Poly Ethylene Wax can be used as the film reinforcing agent, and is used to prevent scratching by providing activity to the ink film. SiO ₂ can be used as the anti-blocking agent, and it roughens the ink film surface to reduce adhesion and prevent blocking. The antistatic agent is a surfactant that lowers the electrical resistance of ink and additionally prevents static electricity interference during printing.

The additive is preferably included in an amount of 1 to 5 parts by weight based on the total weight of the ink composition.

The ink composition may further include functional ingredients. The functional ingredient may include a water-soluble antibacterial agent and a far-infrared ray emitting material. The functional ingredient removes various harmful gases and harmful bacteria generated in the printing layer and removes unique odors generated from ink, making it possible to produce cleaner and more eco-friendly packaging paper.

The water-soluble antibacterial agent may include one or more selected from the group consisting of titanium dioxide powder, zeolite powder, chitosan, citric acid, glycerin, calcined shell powder, cinnamon powder, and grapefruit seed extract.

The fired shell powder may be obtained by firing various shells such as petrified, abalone, oysters, blood clams, clams, scallops, pearl clams, pearl mussels, and cockles at a low temperature of 500 to 700°C and then powdering them. there is. At this time, firing may be performed 1 to 3 times, for example, 3 times. The fired shell powder is a natural material and exhibits excellent antibacterial properties while ensuring environmental friendliness.

For example, the water-soluble antibacterial agent may be a mixture of titanium dioxide powder, chitosan, glycerin, calcined shell powder, cinnamon powder, and grapefruit seed extract. The water-soluble antibacterial agent is titanium dioxide powder, chitosan, glycerin, calcined shell powder, cinnamon powder, and grapefruit seed extract in a weight ratio of 0.5 to 0.6: 0.6 to 0.8: 0.6 to 0.7: 1 to 1.2: 0.8 to 0.9: 0.9 to 1.1. It may be a mixture.

The water-soluble antibacterial agent may be included in an amount of 1 to 6 parts by weight, for example, 6 parts by weight, based on 100 parts by weight of the ink composition.

The far-infrared radiation material refers to a material that emits far-infrared rays. The far-infrared rays are a type of electromagnetic wave that warms materials and has strong penetrating power into organic matter, so they are called rays of life or growth, and have a long wavelength of approximately 3.6 to 16 microns (㎛). radiates heat energy. In particular, this heat energy penetrates up to 40 mm into the skin and expands the capillaries of the human body through a thermal effect, thereby facilitating blood circulation. When animals and plants receive a lot of this far-infrared ray, it promotes growth, and when applied to crops such as greenhouses, the effect is great. is known to be large.

In the ink composition containing the far-infrared ray emitting material according to the present invention, various materials may be additionally mixed. For example, a material that emits negative ions, such as tourmaline, may be added. The negative ions are known to have various effects on the human body, such as blood purification, mental stabilization, autonomic nerve regulation, immunity strengthening, lung function strengthening, pain relief, and allergy improvement.

As the far-infrared ray emitting material, various known types can be used, for example, any one selected from the group consisting of kaolin, germanium, red clay, elvanite, bioceramics, illite, mica, and feldspar. , a mixture of two or more can be used, and in addition, silica, alumina, iron oxide, magnesium oxide, etc. can also be used.

For example, the far-infrared ray emitting material may be a mixture of kaolin, germanium, bioceramics, mica, and alumina. The far-infrared radiation material may be included in an amount of 1 to 4 parts by weight, for example, 4 parts by weight, based on 100 parts by weight of the ink composition.

Fourth, the eco-friendly ink composition can be applied on one side of the pretreated base layer to form a printing layer. Specifically, a print layer may be formed on the other side opposite to the film layer formed on one side of the pretreated base layer.

In other words, the printing layer is formed on the outer surface of the food packaging, that is, the surface opposite to the surface in contact with the contents (food), thereby preventing the components of the ink composition from coming into direct contact with the contents (food), creating a more hygienic food packaging. can be provided.

In addition, the printing layer allows various design elements such as colors, patterns, and patterns to be expressed, thereby enhancing and differentiating the packaging, thereby increasing consumers' desire for consumption.

The application can be done using a general method commonly used in the field. The application amount per application may be, for example, 2 to 8 g/m ² , specifically 3 to 7 g/m ² , and preferably 5 g/m ² , and the application may be performed 1 to 3 times. It can be performed once, preferably twice in succession.

Fifth, infrared heat treatment can be performed by irradiating infrared rays to the film layer and/or the printing layer. In the present invention, the coating film formation of the film layer and the printing layer may be achieved only by infrared heat treatment, without using the conventional UV curing. This solves the problem of complex manufacturing processes and increased facility costs due to existing UV curing methods, and eliminates concerns about the printed layer and packaging being deformed or damaged due to the temperature of the contents (food) or the external environment.

To perform the infrared heat treatment, a commonly used infrared irradiation device can be used. That is, using an infrared irradiation device, infrared rays can be irradiated to the film layer and the printing layer respectively with a built-in infrared lamp.

The infrared heat treatment is preferably performed at a temperature of 680 to 720°C, for example, 700°C. The distance between the infrared lamp and the film layer or the print layer is preferably maintained at 13 to 17 cm, for example, 15 cm.

By performing the infrared heat treatment under the above-described conditions, the film layer and the printing layer can be effectively cured using a much simpler manufacturing process compared to existing methods, allowing the coating film to be formed more robustly.

Sixth, after infrared heat treatment, cooling may be performed on the film layer and/or the printing layer. The cooling can be performed using a conventional cooling device, for example, by spraying cooling wind at less than 15°C, for example, -10 to 10°C, for rapid cooling for 30 seconds to 3 minutes.

Referring to Figure 2, food packaging according to an embodiment of the present invention can be manufactured. The food packaging may include the base layer and the printing layer. In another embodiment, the food packaging may include the film layer, which is a layer in contact with the contents (food), the base layer located on the film layer, and the printing layer located on the base layer.

The food packaging paper according to an embodiment of the present invention can be used as a packaging material for instant foods such as fried foods, breads, snacks, snacks, ham, sausages, hot bars, fish cakes, etc. However, there are no significant restrictions on the type of food used in the food packaging.

If necessary, the food packaging may be manufactured by further including one or more additional layers selected from the group consisting of sealing paper, aluminum thin film, adhesive layer, and primer layer. The method of forming the additional layer may follow techniques well known in the art.

The method for manufacturing food packaging of the present invention includes forming a film layer using an eco-friendly coating liquid on one side of a paper-based substrate, and forming a printing layer using an eco-friendly ink composition on the other side, wherein the film layer It is characterized by using a simple process method of performing infrared heat treatment on the and printing layer.

The food packaging produced through this process has excellent barrier properties such as water resistance and oil resistance, as well as excellent heat sealability and printability, and can effectively prevent deformation and damage of the packaging due to the temperature of the food or external factors.

In addition, by using a paper-based substrate, eco-friendly coating liquid, and eco-friendly ink composition, it is possible to obtain eco-friendly food packaging that is easy to recycle (recycle), ensuring both disposable convenience and eco-friendliness, not only in the food industry, but also in the food industry. , it can also make a significant contribution in terms of environmental protection.

In this specification, only a few examples of various embodiments performed by the present inventors are described, but the technical idea of the present invention is not limited or limited thereto, and of course, it can be modified and implemented in various ways by those skilled in the art.

Claims (9)

Preparing a substrate;
Performing pretreatment on both sides of the substrate to form a pretreated substrate layer;
Preparing an eco-friendly ink composition comprising resin, pigment, water-soluble solvent, and additives;
forming a printing layer by applying the eco-friendly ink composition on one side of the pretreated base layer;
performing infrared heat treatment by irradiating infrared rays to the printed layer; and
Comprising: performing cooling after heat treatment,
The pretreatment is corona treatment or plasma treatment,
Before forming the printing layer, applying a water-soluble resin composition on one side of the pretreated base layer, drying it, and heat treating it to form a film layer; further comprising:
In the step of forming the film layer, the water-soluble resin composition is a water-soluble acrylic polyurethane coating solution, and further comprises 1 to 5 parts by weight of a water-soluble antibacterial agent and 1 to 5 parts by weight of a far-infrared ray emitting material, based on 100 parts by weight of the water-soluble resin composition. Characterized in that the application is performed twice in succession at a single application amount of 3 g/m ² , and the drying is performed for 1 to 5 minutes using a hot air device,
The printed layer is formed on the other side opposite to the film layer formed on one side of the pretreated base layer,
The eco-friendly ink composition contains, based on 100 parts by weight of the ink composition, the resin, vinyl chloride-isobutyl vinyl ether copolymer, ethylene-vinyl acetate copolymer, or It contains 5 to 15 parts by weight of a combination thereof, and further includes 6 parts by weight of the water-soluble antibacterial agent and 4 parts by weight of the far-infrared radiation material,
The water-soluble antibacterial agent is titanium dioxide powder, chitosan, glycerin, calcined shell powder, cinnamon powder, and grapefruit seed extract in a weight ratio of 0.5 to 0.6: 0.6 to 0.8: 0.6 to 0.7: 1 to 1.2: 0.8 to 0.9: 0.9 to 1.1. It is a mixture, and the far-infrared radiation material is a mixture of kaolin, germanium, bioceramics, mica, and alumina,
The infrared heat treatment is performed using an infrared irradiation device equipped with an infrared lamp, and the heat treatment is performed at a temperature of 680 to 720 ° C., and the distance between the infrared lamp and the printing layer is maintained at 13 to 17 cm. A method of manufacturing food packaging paper. delete delete According to paragraph 1,
The substrate is paper,
The paper includes coated paper such as art paper, sc Manila paper, Ivory Manila paper, Royal Ivory Manila paper, and CCP (Cast Coated Paper); Uncoated paper such as white paper, corrugated paper, kraft paper, corrugated paper and manila paper; Or a method of manufacturing food packaging, characterized in that any one selected from a combination thereof. delete delete delete According to paragraph 1,
The cooling is a method of manufacturing food packaging, characterized in that rapid cooling is performed for 30 seconds to 3 minutes by spraying cooling wind at -10 to 10°C using a cooling device. Food packaging paper manufactured according to the method for manufacturing food packaging paper according to any one of claims 1, 4, and 8.