KR20230125914A - Manufacturing method of food packaging paper using infrared heat treatment - Google Patents

Abstract

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

Description

Manufacturing method of food packaging paper using infrared heat treatment {Manufacturing method of food packaging paper using infrared heat treatment}

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

Food wrappers include, for example, various foods such as fried foods, bread products, and snacks; beverage; ice cream; It is a container that contains and wraps or seals the contents inside, so that the user can consume the contents hygienically and conveniently.

Conventionally, food wrapping paper and containers are usually made of materials based on polymer resins such as polyethylene (PE) and polyethylene terephthalate (PET), and the above materials have great advantages of excellent barrier function and low price. It is still the most widely used.

However, polymer resin (plastic), which is the main component of food wrapping paper, is recognized as one of the biggest causes of environmental pollution due to disposal problems 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 papers and used for waterproofing purposes. There is a risk of releasing endocrine disruptors that are harmful to the human body. In addition, polyethylene coated paper has a disadvantage in that recycling costs increase because polyethylene that is not dissociated in water must undergo a separate sorting process in the process of dissociating for recycling after use. As a result, foreign currency is wasted due to the need for continuous import of pulp for the manufacture of wrapping paper, and limits are revealed in terms of recycling resources.

Accordingly, in recent years, various paper-based food wrapping papers have been developed to meet the social demand for eco-friendliness. However, food wrappers based on paper have a chronic problem in that barrier properties such as water resistance and oil resistance are lowered compared to plastic materials due to the nature of the material.

In particular, in the case of wrapping paper for instant foods such as fried foods, breads, and snacks, it is used to wrap the wrapping paper temporarily containing food by hand to make it convenient to consume the food immediately rather than to store the contents for a long time. In most cases Therefore, when paper-based wrapping paper is used, problems in that food is easily deformed or damaged due to temperature or external factors occur more easily.

On the other hand, the concept of food wrapping paper in modern society encourages consumers' desire to consume and appetite by variously expressing colors, patterns, and designs through printing on the outer surface of the wrapping paper as well as basic physical properties including barrier properties. It also includes a function to do so. That is, in the modern consumption culture, the demand for qualitative improvement of the functionality of food wrapping paper is gradually increasing.

Therefore, in food wrapping paper based on paper with excellent eco-friendliness, a printing layer is formed on one side. At this time, while reducing harmfulness to the human body due to residual solvents contained in printing ink, improving printability, excellent barrier In-depth research on the manufacturing method of food wrapping paper that can secure the characteristics together is required.

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

The present invention is to solve the above problems, by printing using an eco-friendly ink composition on a paper-based substrate and performing infrared heat treatment, excellent barrier properties such as water resistance and oil resistance, excellent printability, An object of the present invention is to provide a method for manufacturing a food wrapper that effectively prevents deformation and damage of the wrapper due to temperature or external factors of the food.

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

The purpose is to prepare a substrate; Performing a pretreatment on both sides of the substrate to form a pretreated substrate layer; Preparing an eco-friendly ink composition containing a resin, a pigment, a water-soluble solvent and an additive; Forming a printing layer by applying the eco-friendly ink composition on one surface of the pretreated substrate layer; performing an infrared heat treatment by irradiating the printed layer with infrared rays; It can be achieved by a method for manufacturing a food wrapper including; and performing cooling after heat treatment.

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

The base material is paper, and the paper is art paper, sc manilla paper, ivory manilla paper, royal ivory manilla paper, and CCP (Cast Coated Paper) coated paper; uncoated paper such as white paper, corrugated paper, kraft paper, corrugated paper and manila paper; Or it is characterized in that any one selected from a combination thereof.

The pretreatment is characterized by 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 ray emitter, 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, ocher, elvan, bio-ceramic, 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 of -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 prepare a food wrapper, barrier properties such as water resistance and oil resistance are excellent, heat sealability and printability are excellent, and food temperature or external It is possible to effectively prevent deformation and damage of wrapping paper caused by enemy 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 securing disposable convenience and eco-friendliness at the same time, thereby protecting the environment as well as the food industry. can also make a significant contribution to

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.

1 is a flow chart showing a method for manufacturing food wrapping paper according to an embodiment of the present invention.
2 is a photograph showing a food wrapping paper manufactured according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. These examples are only 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. .

In addition, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of skill in the art to which this invention belongs, and in case of conflict, this specification including definitions of will take precedence.

In order to clearly explain the proposed invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification. And, when a certain component is said to "include", this means that it may further include other components without excluding other components unless otherwise stated. Also, a “unit” described in the specification means one unit or block that performs a specific function.

In each step, the identification code (first, second, etc.) is used for convenience of description, and the identification code does not describe the order of each step, and each step does not clearly describe a specific order in context. It may be performed 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 reverse order.

In the present invention, in the present specification, "food wrapper" may mean, for example, a packaging material 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, embodiments and embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, it may not be limited to these implementations and examples and figures herein.

One aspect of the present application, preparing a substrate; Performing a pretreatment on both sides of the substrate to form a pretreated substrate layer; Preparing an eco-friendly ink composition containing a resin, a pigment, a water-soluble solvent and additives; Forming a printing layer by applying the eco-friendly ink composition on one surface of the pretreated substrate layer; performing an infrared heat treatment by irradiating the printed layer with infrared rays; Performing cooling after heat treatment; provides a method for manufacturing a food wrapper including a.

First, a method for manufacturing a food wrapping paper according to an embodiment of the present disclosure may be described through FIG. 1 .

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

The material of the base material, for example, coated paper such as art paper (art paper), sc manilla paper, ivory manilla paper, royal ivory manilla paper, and 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 may be used as the material of the substrate.

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

A film layer may be formed on one surface of the pretreated substrate layer. The film layer is a surface that is in direct contact with the content (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 form a coating layer by applying and drying a water-soluble resin composition, and then heat-treating the coating layer to complete the film layer. The water-soluble resin composition may be, for example, 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 include a functional component. The functional component may include a water-soluble antibacterial agent and a far-infrared ray emitter. The functional component removes various harmful gases and harmful bacteria that may occur in the coating layer and exhibits a deodorizing effect, so that cleaner and more environmentally friendly packaging can be manufactured.

The functional component is the same as the functional component included in the "eco-friendly ink composition" to be described later, and will be described in more detail later. The water-soluble antimicrobial 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 emitter 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.

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

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

In another embodiment, in manufacturing the food wrapping paper, the formation of the film layer may be omitted.

Thirdly, an eco-friendly ink composition may be prepared. The ink composition may secure eco-friendliness by using a water-soluble solvent without using a VOC-regulated substance.

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

The resin serves to color the ink composition when forming the printed layer. As the resin, at least one selected from the group consisting of vinyl-based resins, epoxy resins, alkyd resins, amide resins, acrylic resins, and acetyl cellulose may be used. In one example, the resin, a vinyl resin, such as a vinyl chloride-isobutyl vinyl ether copolymer (vinyl chloride-isobutyl vinyl ether copolymer), ethylene-vinyl acetate copolymer (ethylene-vinyl acetate copolymer) or a combination thereof can be used

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 an amount of less than 5 parts by weight, pigment precipitation may occur or printability may be deteriorated, and if the amount exceeds 15 parts by weight, manufacturing cost may be increased and economic feasibility may be reduced, and the viscosity of the ink composition may be increased to print Efficiency may decrease.

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

As specific examples of the pigment, general materials commonly used in the art may be used. For example, as the pigment, azo-lake, condensed azo-based, phthalocyan-based, titanium oxide, carbon black, etc. may be used, 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 an effect of reducing carbon dioxide, and exhibits the advantage of not leaving residual solvents in food packaging.

The additives may include additive components commonly used in the art, such as film reinforcing agents, antiblocking agents, antistatic agents, antifoaming agents, adhesion reinforcing agents, heat resistance reinforcing agents, and transferability improving agents.

For example, Poly Ethylene Wax may be used as the film reinforcing agent, and is used to prevent scratches by activating the ink film. SiO ₂ can be used as the antiblocking agent, and it roughens the surface of the ink film to reduce adhesion and prevent blocking. The antistatic agent is a surfactant and lowers the electrical resistance of the ink, thereby assisting in preventing static electricity damage during printing.

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

The ink composition may further include a functional component. The functional component may include a water-soluble antibacterial agent and a far-infrared ray emitter. The functional component removes various harmful gases and harmful bacteria generated from the printed layer, and removes the peculiar odor generated from the ink, so that cleaner and more environmentally friendly wrapping paper can be manufactured.

The water-soluble antimicrobial agent may include at least one 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 calcined shell powder may be powdered after low-temperature calcining of various shells such as petrified, abalone, oysters, blood clams, clams, scallops, pearl shells, mussels, and cockles at a temperature of 500 to 700 ° C. there is. At this time, firing may be performed 1 to 3 times, for example, 3 times. The calcined shell powder is a natural material and exhibits excellent antibacterial ability while securing eco-friendliness.

For example, the water-soluble antimicrobial agent may be a mixture of titanium dioxide powder, chitosan, glycerin, calcined shell powder, cinnamon powder, and grapefruit seed extract. The water-soluble antimicrobial agent is a mixture of 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. may be mixed.

The water-soluble antimicrobial 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 ray emitter means a material that emits far-infrared rays, and the far-infrared rays are a kind of electromagnetic wave that warms materials and has strong penetrating power into organic matter, so it is called a ray of life or growth, and has a long wavelength of about 3.6 to 16 microns (㎛). radiates thermal energy. In particular, this heat energy penetrates up to 40mm into the skin and expands the capillaries of the human body through thermal action to facilitate blood circulation. is known to be large.

Various materials may be additionally mixed in the ink composition including the far-infrared ray emitter according to the present invention. For example, a material that emits negative ions such as tourmaline may be added. The negative ions are known to have various effects such as blood purification, mental stabilization, autonomic nervous regulation, immune enhancement, lung function enhancement, pain relief, and allergy improvement.

Various types of known far-infrared emitting materials may be used, for example, any one selected from the group consisting of kaolin, germanium, ocher, elvan, bio-ceramic, illite, mica and feldspar. , A mixture of two or more may be used, and in addition, silica, alumina, iron oxide, magnesium oxide, and the like may also be used.

For example, the far-infrared ray emitter may use a mixture of kaolin, germanium, bioceramic, mica, and alumina. The far-infrared ray emitter 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, a printing layer may be formed by applying the eco-friendly ink composition on one surface of the pretreated substrate layer. Specifically, a print layer may be formed on the other surface opposite to the film layer formed on one surface of the pretreated substrate layer.

In other words, the printing layer is formed on the outer surface of the food wrapper, that is, on the surface opposite to the surface in contact with the contents (food), so that the components of the ink composition do not come into direct contact with the contents (food), resulting in a more hygienic food wrapper can provide.

In addition, the printing layer allows various design elements such as colors, patterns, and patterns to be expressed to give high quality and differentiation to wrapping paper, thereby increasing consumers' desire for consumption.

For the application, a general method commonly used in the art may be used. During the application, the amount of application per application may be, for example, 2 to 8 g/m ² , specifically 3 to 7 g/m ² , preferably 5 g/m ² , and the application may be performed 1 to 3 times. times, preferably twice in succession.

Fifth, infrared heat treatment may be performed by irradiating infrared rays to the film layer and/or the printing layer. In the present invention, the film formation of the film layer and the printed layer may be performed only by infrared heat treatment without using uv curing, which is generally used in the prior art. Thereby, it is possible to solve the problem of complicated manufacturing process and increased facility cost due to the existing uv curing method, and to eliminate the concern that the printing layer and the wrapping paper are deformed or damaged due to the temperature of the contents (food) or the external environment.

In order to perform the infrared heat treatment, a commonly used infrared irradiation device may be used. That is, infrared rays may be irradiated to each of the film layer and the printed layer using an infrared lamp built in using an infrared irradiation device.

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 printing 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 printed layer can be effectively cured with a much simpler manufacturing process than conventional methods, so that the coating film can be formed more firmly.

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

Referring to Figure 2, it is possible to manufacture a food wrapper according to an embodiment of the present invention. The food wrapper may include the substrate layer and the printing layer. In another embodiment, the food wrapper may include the film layer, which is a layer in contact with contents (food), the base layer positioned on the film layer, and the printing layer positioned on the base layer.

Food wrapping paper according to an embodiment of the present invention may be used as a packaging material for instant foods such as fried foods, breads, snacks, ham, sausages, hot bars, fish cakes, and the like. However, the type of food used in the food wrapper is not significantly limited.

If necessary, the food wrapper may further include one or more additional layers selected from the group consisting of a sealing paper, an aluminum thin film, an adhesive layer, and a primer layer. A method of forming the additional layer may follow a technique widely known in the art.

In the method for manufacturing a food wrapping paper of the present invention, a film layer is formed on one side of a paper-based substrate using an eco-friendly coating solution, and a printing layer is formed on the other side using an eco-friendly ink composition, but the film layer It is characterized by using a simple process method of performing infrared heat treatment on the printed layer.

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

In addition, by using a paper-based substrate, an eco-friendly coating liquid, and an eco-friendly ink composition, it is possible to obtain eco-friendly food packaging that is easy to recycle (recycle), thereby securing disposable convenience and eco-friendliness at the same time as well as in the food industry. However, 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 spirit of the present invention is not limited or limited thereto, and can be modified and implemented in various ways by those skilled in the art, of course.

Claims (9)

Preparing the substrate;
Performing a pretreatment on both sides of the substrate to form a pretreated substrate layer;
Preparing an eco-friendly ink composition containing a resin, a pigment, a water-soluble solvent and an additive;
Forming a printing layer by applying the eco-friendly ink composition on one surface of the pretreated substrate layer;
performing an infrared heat treatment by irradiating the printed layer with infrared rays; and
Performing cooling after heat treatment; method of manufacturing a food wrapper containing a. According to claim 1,
The infrared heat treatment is performed using an infrared irradiation device having an infrared lamp, characterized in that the heat treatment is performed at a temperature of 680 to 720 ℃, food wrapping paper manufacturing method. According to claim 2,
The distance between the infrared lamp and the printing layer, characterized in that maintaining 13 to 17cm, food wrapping paper manufacturing method. According to claim 1,
The substrate is paper,
The paper is art paper (art paper), sc manilla paper, ivory manilla paper, royal ivory manilla paper, and CCP (Cast Coated Paper) coated paper; uncoated paper such as white paper, corrugated paper, kraft paper, corrugated paper and manila paper; Or, characterized in that any one selected from a combination thereof, the method of manufacturing food wrapping paper. According to claim 1,
The pretreatment is characterized in that the corona treatment or plasma treatment, the method of manufacturing food wrapping paper. According to claim 1,
The eco-friendly ink composition, based on 100 parts by weight of the composition, characterized in that it further comprises 1 to 6 parts by weight of a water-soluble antibacterial agent and 1 to 4 parts by weight of a far infrared ray emitter, food wrapping paper manufacturing method. According to claim 6,
The far-infrared radiation material is any one selected from the group consisting of kaolin, germanium, loess, elvan, bioceramic, illite, mica and feldspar, or a mixture of two or more, food wrapping paper manufacturing method. According to claim 1,
The cooling is characterized by rapid cooling for 30 seconds to 3 minutes by spraying cooling wind of -10 to 10 ° C using a cooling device, a method for producing food wrappers. Claims 1 to 8, produced by the method of manufacturing a food wrapping paper according to any one of claims, food wrapping paper.