Preparation method of metal laser film thin paper and hot-pressed packaging bag

Abstract

The invention discloses a preparation method of metal laser film thin paper and a hot-pressed packaging bag, which comprises the following steps: coating coated paper and a metal laser film with a water-based adhesive to obtain the metal laser film thin paper, and then coating the surface of the thin paper film with green paint, heating, curing and removing static electricity. The problems that inking cannot be achieved during laser metal film surface printing, and paper cannot be used due to the fact that paper separation is affected by a large amount of static electricity generated by high-temperature friction are solved. And then the surface of the metal laser film thin paper is subjected to tension balance treatment to ensure that the paper is flat after being cut into single pieces, and the problem that the paper covered with the metal laser film is rolled up and cannot be used due to the tension difference of the surface of the film thin paper is solved. Packaging patterns and description characters are printed on the film outer surface of the metal laser film thin paper, high-temperature coating treatment is conducted on the surface of the film thin paper, it is guaranteed that the patterns and the description characters are attached to the surface of the metal laser film and do not fall off after high-temperature hot pressing, and the packaging patterns and the description characters are printed on the film outer surface of the metal laser film thin paper instead of the paper.

Description

Technical Field

[0001] The invention relates to the technical field of packaging products, and in particular to a method for preparing a metal laser film thin paper hot-pressed packaging bag. Background Art

[0002] For many years, the production materials of flexible packaging are mainly plastic soft materials, which basically belong to plastic properties. The production process and materials of flexible packaging are also limited to the scope of plastic materials. The packaging pattern is printed on the inner surface of the outer film, and then covered with a layer of plastic inner film. Visually and textured, it belongs to plastic flexible packaging. The main material of paper packaging is paper. The packaging pattern and instructions are mainly printed on paper. The surface of the pattern is covered with a layer of transparent plastic material. The function of the transparent plastic material is to protect the paper and the pattern. Visually and textured, it belongs to paper packaging. At present, paper packaging on the market is mainly formed by die cutting, gluing, mounting, snapping and other process structures, and it is impossible to directly form packaging bags by hot pressing.

[0003] The production method and printing process of hot-pressed packaging bag materials of metal laser film thin paper is an innovation of flexible packaging and paper packaging, an effect that neither flexible packaging nor paper packaging has. It inherits the genes of flexible packaging and paper packaging, and at the same time has the texture and effect of metal, with its unique technology and sensory effects. This technology uses 80g-157g coated paper and 12-20μ metal laser film with water-based adhesive to laminate the metal laser film thin paper with a thickness of 100g-185g. The current metal laser film thin paper has the following main difficulties: 1. Thin paper with one side coated will produce a tension difference on both sides. The paper coated with metal radium film will roll up and become a roll after a long time, making it impossible to produce and use; 2. Single-sided metal radium film will generate a lot of static electricity during the production process due to the friction of the high-temperature metal surface. The weight of a single sheet of thin paper is small, and static attraction will seriously affect the separation of paper, which will also make this thin paper impossible to produce and use; 3. The hot-pressed packaging bag technology uses the different melting points of the inner and outer films. The outer film has a high melting point and the inner film has a low melting point. When the temperature reaches the melting point of the inner low-temperature film, the inner film will naturally stick together. Because the temperature of the outer layer is relatively high, reaching 150-230℃, the application of high-temperature protective oil can prevent the high-temperature heating from burning the outer printed color and the metal radium film. These factors have led to the fact that there are currently no hot-pressed packaging bags for metal laser film thin paper on the market. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a metal laser film thin paper hot-pressed packaging bag with a more reasonable process scheme, which can ensure that the printed patterns and texts are strongly adhered to the surface of the metal laser film and do not fall off after high-temperature hot pressing.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a method for preparing a metal laser film thin paper hot-pressed packaging bag, characterized in that the method is carried out according to the following steps:

[0006] (1) 80g-157g of coated paper and 12-20μ metal laser film are laminated with water-based glue, and then subjected to five oven heating treatments to form metal laser film thin paper. The first oven temperature is 50-95℃, the second oven temperature is 90-150℃, the third oven temperature is 100-160℃, the fourth oven temperature is 70-125℃, and the fifth oven temperature is 65-115℃, and then cured for 10-30 hours. The treatment time of each oven is 3-5 seconds, and the temperature is gradually increased and decreased for drying. The main components of water-based glue are styrene, butyl butyl ester, APS, emulsifier and deionized water. The baking time needs to be appropriate. If the baking time is too short, the water-based glue will not be dried, which will cause the metal laser film to separate from the thin paper, or cause the paper to crack; if the baking time is too long, the metal laser film thin paper will curl and cannot be used.

[0007] (2) Coating the surface of the metal laser film thin paper after the treatment in step (1) A layer of transparent green paint is coated on the surface of the laminated laser film paper, and then dried in seconds by heating at 210-260°C, and then cooled to 10-20°C for curing. This has two functions: one is to increase the protective layer to reduce static electricity generated by friction; the other is to enhance the adhesion of UV ink. Without this process, the laser film of the metal laser film thin paper cannot be inked and cannot be printed;

[0008] (3) performing a reverse curving treatment on the roll of metal laser film thin paper after the treatment in step (2), pulling and curling in the reverse direction, and curing at 10-20° C. for 12-24 hours to ensure that the tension on the front and back surfaces of the metal laser film thin paper is balanced;

[0009] (4) performing a plasma anti-static treatment on the metal laser film thin paper after the treatment in step (3), and then cutting the roll of metal laser film thin paper into flat sheets of paper;

[0010] (5) Printing product packaging patterns and instructions on the film surface of the metal laser film thin paper cut into flat sheets by UV printing;

[0011] (6) heating the outer film surface of the metal laser film thin paper printed with patterns and texts after the treatment in step (5) and evenly coating it with a layer of epoxy acrylic resin low-odor reverse surface oil as a high-temperature protective oil, and then drying it at a high temperature of 200-250° C., which belongs to the coating high-temperature drying process;

[0012] (7) removing static electricity from the metal laser film thin paper after the treatment in step (6) and cooling it to 10-20° C. for curing;

[0013] (8) The inner layer of the metal laser film thin paper treated in step (7) is laminated with the corona surface of the CPP low-temperature film by heating the water-based adhesive to 90-110°C. The static friction coefficient of the corona surface of the CPP low-temperature film (CPP aluminum plating) is 0.48-0.5, and the melting point of the corona surface is 135-150°C. The main components of the water-based adhesive are styrene, butyl butyl acrylate, APS, emulsifier and deionized water. The non-corona surface of the CPP low-temperature film (CPP aluminum plating) is the outermost layer, and the non-corona melting point is 115-120°C; then the temperature is lowered to 10-20°C and cured for 10-30 hours;

[0014] (9) cutting the metal laser film thin paper processed in step (8) into single sheets;

[0015] (10) Folding a single sheet of metal laser film thin paper in half, and pressing three sides (the folded side and adjacent left and right sides) at 150-230° C. to form a metal laser film thin paper packaging bag.

[0016] The present invention first coats and heats the film surface of the metal laser film thin paper, then reverses the curvature of the metal laser film thin paper, reversely pulls and curls it, and cures it for 24 hours in an environment of 10-20°C to ensure the tension balance of the front and back surfaces of the metal laser film thin paper, and performs anti-static treatment, thereby solving the problems that the paper covered with the metal laser film will roll up due to tension difference on the film thin paper surface, the metal film surface cannot be printed with ink, and the high temperature friction generates a large amount of static electricity that affects the separation of paper and makes it difficult to produce and use. After that, the packaging pattern and instruction text are printed on the outer surface of the film of the metal laser film thin paper, and then the surface of the film thin paper is subjected to high temperature coating treatment to ensure that the printed pattern and text are strongly attached to the surface of the metal laser film, and do not fall off after high temperature hot pressing. The packaging pattern and instruction text are printed on the outer surface of the film of the metal laser film thin paper instead of on the paper, thereby solving the problems existing in the prior art. DETAILED DESCRIPTION

[0017] The following is further described in conjunction with specific implementation methods:

[0018] In this embodiment, the method for preparing the metal laser film thin paper hot-pressed packaging bag is carried out according to the following steps:

[0019] (1) 80g-157g (e.g. 130g) of coated paper and 12-20μ (e.g. 15μ) of metal laser film are laminated with water-based adhesive, and then subjected to five oven heating treatments to form metal laser film thin paper. The thickness of the obtained metal laser film thin paper is 100g-185g (e.g. 150g). The temperature of the first oven is 50-95°C, the temperature of the second oven is 90-150°C, the temperature of the third oven is 100-160°C, the temperature of the fourth oven is 70-125°C, and the temperature of the fifth oven is 65-115°C, and then cured for 10-30 hours. The treatment time of each oven is 3-5 seconds, and the temperature is gradually increased and decreased for drying. The main components of the water-based adhesive are: styrene, butyl crotonate, APS, emulsifier and deionized water. The baking time needs to be appropriate. If the baking time is too short and the water-based glue is not dried, the metal laser film will separate from the thin paper, or the paper will crack. If the baking time is too long, the metal laser film thin paper will curl and cannot be used.

[0020] (2) coating the surface of the metal laser film thin paper treated in step (1) by coating a layer of transparent green paint on the surface of the laminated laser film paper, heating at 210-260° C. to dry in seconds; then cooling to 10-20° C. to cure;

[0021] (3) performing a reverse curving treatment on the roll of metal laser film thin paper after the treatment in step (2), pulling and curling in the reverse direction, and curing at 10-20° C. for 24 hours to ensure that the tension on the front and back surfaces of the metal laser film thin paper is balanced;

[0022] (4) performing a plasma anti-static treatment on the metal laser film thin paper after the treatment in step (3), and then cutting the roll of metal laser film thin paper into flat sheets of paper;

[0023] (5) Printing packaging patterns and instructions on the film surface of the metal laser film thin paper cut into flat sheets by UV printing;

[0024] (6) heating the outer film surface of the metal laser film thin paper printed with patterns and texts after the treatment in step (5) and evenly coating it with a layer of epoxy acrylic resin low-odor reverse surface oil as a high-temperature protective oil, and then drying it at a high temperature of 200-250° C., which belongs to the coating high-temperature drying process;

[0025] (7) removing static electricity from the metal laser film thin paper after the treatment in step (6) and cooling it to 10-20° C. for curing;

[0026] (8) The inner layer of the metal laser film thin paper treated in step (7) is laminated with the corona surface of the CPP low-temperature film (or CPP aluminum-plated) by heating the water-based adhesive to 90-110°C. The static friction coefficient of the corona surface of the CPP low-temperature film (CPP aluminum-plated) is 0.48-0.5, and the melting point of the corona surface is 135-150°C. The main components of the water-based adhesive are styrene, butyl butyl acrylate, APS, emulsifier and deionized water. The non-corona surface of the CPP low-temperature film (CPP aluminum-plated) is the outermost layer, and the non-corona melting point is 115-120°C; then the temperature is lowered to 10-20°C and cured for 10-30 hours;

[0027] (9) cutting the metal laser film thin paper processed in step (8) into single sheets;

[0028] (10) Folding a single sheet of metal laser film thin paper in half, and pressing three sides (the folded side and adjacent left and right sides) at 150-230° C. to form a metal laser film thin paper packaging bag.

[0029] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A method for preparing a metal laser film thin paper hot-pressed packaging bag, characterized in that: Follow these steps: (1) Laminating the coated paper and the metal laser film with water-based adhesive, and then subjecting the paper to five oven heating treatments to form the metal laser film thin paper, wherein the first oven temperature is 50-95°C, the second oven temperature is 90-150°C, the third oven temperature is 100-160°C, the fourth oven temperature is 70-125°C, and the fifth oven temperature is 65-115°C, and then curing is performed for 10-30 hours; the treatment time of each oven is 3-5 seconds, and the temperature is gradually increased and then decreased for drying; (2) coating the surface of the metal laser film thin paper after the treatment in step (1), coating the surface of the metal laser film thin paper with a layer of transparent green paint, heating at 210-260° C. to dry in seconds, and then cooling to 10-20° C. to cure; (3) performing a reverse curvature treatment on the surface of the metal laser film thin paper after the treatment in step (2), pulling the roll of metal laser film thin paper in the reverse direction to curl it, and then curing it to ensure that the tension on the front and back surfaces of the metal laser film thin paper is balanced; (4) performing a plasma anti-static treatment on the metal laser film thin paper after the treatment in step (3), and then cutting the roll of metal laser film thin paper into flat sheets of paper; (5) Printing product packaging patterns and instructions on the film surface of the metal laser film thin paper cut into flat sheets by UV printing; (6) heating the outer film surface of the metal laser film thin paper printed with patterns and texts after the treatment in step (5) and evenly coating it with a layer of high temperature protective oil; (7) performing a static elimination and cooling curing treatment on the metal laser film thin paper after the treatment in step (6); (8) heating the inner layer of the metal laser film thin paper and the corona surface of the CPP low-temperature film treated in step (7) to 90-110° C. and laminating them with water-based adhesive, and then cooling and curing; (9) cutting the metal laser film thin paper processed in step (8) into single sheets; (10) A single sheet of metal laser film thin paper is folded in half, and the folded edge and the left and right edges connected to the folded surface, a total of three edges, are subjected to high temperature pressing to form a metal laser film thin paper packaging bag.

2. The method for preparing the metal laser film thin paper hot-pressed packaging bag according to claim 1, characterized in that: In step (1), 80g-157g of coated paper and 12-20μ metal laser film are laminated with water-based adhesive, and then subjected to five oven heating treatments to form metal laser film thin paper.

3. The method for preparing the metal laser film thin paper hot-pressed packaging bag according to claim 1, characterized in that: In step (1), the main components of the water-based glue are styrene, butyl crotonate, APS, emulsifier and deionized water.

4. Apply a layer of transparent green paint on the surface of the metal laser film thin paper laminated in step (2), heat it at 210-260°C to dry it in seconds, and then cool it to 10-20°C to solidify.

5. The method for preparing the metal laser film thin paper hot-pressed packaging bag according to claim 1, characterized in that: In step (3), the metal laser film thin paper is reversely pulled up and curled and then cured in an environment of 10-20° C. for 12-24 hours to ensure that the tension on the front and back surfaces of the metal laser film thin paper is balanced.

6. The method for preparing the metal laser film thin paper hot-pressed packaging bag according to claim 1, characterized in that: In step (6), the outer film surface of the metal laser film thin paper is heated and evenly coated with a layer of epoxy acrylic resin low-odor reverse surface oil as a protective oil, and then dried at a high temperature of 200-250°C for seconds.

7. The method for preparing the metal laser film thin paper hot-pressed packaging bag according to claim 1, characterized in that: In step (7), the metal laser film thin paper is cooled to 10-20° C. for curing.

8. The method for preparing the metal laser film thin paper hot-pressed packaging bag according to claim 1, characterized in that: In step (8), the static friction coefficient of the corona surface of the CPP low-temperature film is 0.48-0.5, and the melting point temperature of the corona surface is 135-150°C; the main components of the water-based adhesive are styrene, butyl crotonate, APS, emulsifier and deionized water, the CPP non-corona surface is in the outermost layer, the melting point temperature is 115-120°C, the cooling and curing temperature is 10-20°C, and the time is 10-30 hours.

9. The method for preparing the metal laser film thin paper hot-pressed packaging bag according to claim 1, characterized in that: In step (10), the temperature of high temperature pressing is 150-230°C.