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

Abstract

The present invention discloses a method for preparing metal laser film thin paper and hot-pressed packaging bags. The metal laser film thin paper is obtained by laminating coated paper and metal laser film with a water-based adhesive. The thin paper film surface is then coated with a green lacquer, heated and cured, and subjected to a static-eliminating treatment. This solves the problems of ink not being able to be applied to the laser metal film surface and the high-temperature friction that generates a large amount of static electricity affecting the paper separation and making it unusable. The surface of the metal laser film thin paper is then subjected to a tension-balancing treatment to ensure that the paper is flat after being cut into single sheets. This solves the problem of the metal laser film-coated paper curling up and becoming unusable due to tension differences on the film thin paper surface. A packaging pattern and instructional text are then printed on the outer surface of the metal laser film thin paper. The film thin paper surface is then subjected to a high-temperature coating treatment to ensure that the pattern and text adhere to the metal laser film surface and do not fall off after high-temperature hot pressing. The packaging pattern and instructional text are printed on the outer surface of the metal laser film thin paper rather than on the paper itself.

Description

Technical Field

[0001] The present 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, flexible packaging has primarily been made from soft plastic materials, which generally have plastic properties. The production process and materials used for flexible packaging were also limited to the plastic material sector. The packaging design is printed on the inner surface of the outer film, which is then laminated with a plastic inner film. Visually and tactilely, it resembles plastic flexible packaging. Paper packaging primarily uses paper, with the design and instructions printed on the paper. A transparent plastic material is then applied to the surface to protect the paper and design. Visually and tactilely, it resembles paper packaging. Currently, paper packaging on the market is primarily formed using die cutting, gluing, mounting, and snap-on processes, and cannot be directly formed into bags using hot pressing.

[0003] The production method and printing process of hot-pressed packaging bag materials of metal laser film thin paper are innovations to flexible packaging and paper packaging. It has an effect that neither flexible packaging nor paper packaging has. It inherits the genes of flexible packaging and paper packaging, while also having the texture and effect of metal, and has its own unique technology and sensory effects. This technology uses 80g-157g coated paper and 12-20μm metal laser film with water-based adhesive to laminate the metal laser film thin paper with a thickness of 100g-185g. The current challenges with metallic laser film thin paper are as follows: 1. The thinness of the paper, coupled with a single-sided lamination, creates a tension difference between the two sides. This causes the coated paper to curl up and eventually become a roll, making it unusable. 2. Single-sided metallic laser filming generates significant static electricity during the production process due to friction between the high-temperature metal surface. Since thin paper sheets weigh a single sheet, this static electricity can severely affect the separation of the sheets, making this type of thin paper unusable. 3. Hot-pressed packaging technology utilizes the different melting points of the outer and inner films—the outer film has a higher melting point and the inner film has a lower melting point. When the temperature reaches the melting point of the inner film, the inner film naturally adheres. Because the outer layer's temperature is higher, reaching 150-230°C, a high-temperature protective oil coating is applied to prevent the heat from burning the outer printed color and metallic laser film. These factors have resulted in the current lack of hot-pressed packaging bags for metallic laser film thin paper on the market. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the shortcomings of the existing technology and 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 by: performing the following steps:

[0006] (1) Select 80g-157g coated paper and laminate it with 12-20μm metal laser film with water-based adhesive, and then heat it in five ovens 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℃. Then it is cured for 10-30 hours. The treatment time of each oven is 3-5 seconds, and the temperature is gradually increased and decreased to dry. The main components of 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, the water-based adhesive will not dry, 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 applied to the surface of the laminated laser film paper, which is then heated at 210-260°C for seconds and then cooled to 10-20°C for curing. This process has two functions: one is to increase the protective layer and 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) The rolled metal laser film thin paper treated in step (2) is subjected to a reverse curving treatment, reversely stretched and curled, and cured 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 plasma destaticization 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;

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

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

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

[0013] (8) After the treatment in step (7), the inner layer of the metal laser film thin paper and the corona surface of the CPP low-temperature film are laminated with a water-based adhesive heated 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 crotonate, 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. The temperature is then 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) Fold a sheet of metal laser film thin paper in half, and press three sides (the folded side and the adjacent left and right sides) at a high temperature of 150-230°C to form a metal laser film thin paper packaging bag.

[0016] The present invention first coats and heat-cures the surface of the metal laser film thin paper, then reverse-curves the metal laser film thin paper, reversely pulls and curls it, and cures it in an environment of 10-20°C for 24 hours to ensure tension balance on the front and back surfaces of the metal laser film thin paper, and performs static electricity removal treatment. This solves the problems of the film thin paper surface causing the metal laser film to curl up due to tension difference, the metal film surface printing being unable to ink, and the high temperature friction generating a large amount of static electricity affecting paper separation, making it difficult to produce and use. Afterwards, the packaging pattern and instruction text are printed on the outer surface of the metal laser film thin paper, and the film thin paper surface is then subjected to high-temperature coating treatment to ensure that the printed pattern and text are strongly adhered to the metal laser film surface and do not fall off after high-temperature hot pressing. The packaging pattern and instruction text are printed on the outer surface of the metal laser film thin paper instead of on the paper, thus solving the problems existing in the prior art. DETAILED DESCRIPTION

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

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

[0019] (1) Select 80g-157g (e.g. 130g) of coated paper and laminate it with 12-20μm (e.g. 15μm) metal laser film with water-based adhesive, and then heat it in five ovens to form metal laser film thin paper. The thickness of the obtained metal laser film thin paper is 100g-185g (e.g. 150g). 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℃. Then, it is cured for 10-30 hours. The treatment time of each oven is 3-5 seconds, and the temperature is gradually increased and decreased to dry. 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 it is too short, the water-based glue will not dry, 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.

[0020] (2) Coating the surface of the metal laser film thin paper after the treatment in step (1) Apply a layer of transparent green paint on the surface of the laminated laser film paper, heat it at 210-260℃ and dry it in seconds; then cool it down to 10-20℃ and solidify it;

[0021] (3) The rolled metal laser film thin paper treated in step (2) is subjected to a reverse curving treatment, reversely pulled and curled, and cured 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 plasma destaticization 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;

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

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

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

[0026] (8) After the treatment in step (7), the inner layer of the metal laser film thin paper and the corona surface of the CPP low-temperature film (or CPP aluminum-plated) are laminated with a water-based adhesive heated 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 crotonate, 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. The temperature is then 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) Fold a sheet of metal laser film thin paper in half, and press three sides (the folded side and the adjacent left and right sides) at a high temperature of 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 by: 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 a metal laser film thin paper. 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. The paper is then cured 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), applying a layer of transparent green paint on the surface of the metal laser film thin paper, heating it at a high temperature of 210-260°C to dry it in seconds, and then cooling it to 10-20°C to solidify it; (3) performing a reverse curving 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 and curling 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 plasma destaticization 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; (5) Print product packaging patterns and instructions on the surface of the metal laser film thin paper cut into flat sheets using 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 static removal and cooling curing treatment on the metal laser film thin paper after the treatment in step (6); (8) The inner layer of the metal laser film thin paper treated in step (7) and the corona surface of the CPP low-temperature film are heated to 90-110°C and laminated with water-based adhesive, and then cooled and cured; (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 pressed at high temperature 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 is selected and laminated with a 12-20μm metal laser film using water-based adhesive, and then subjected to five oven heating processes to form a 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 adhesive are styrene, butyl crotonate, APS, emulsifier and deionized water.

4. 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 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.

5. 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.

6. 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.

7. 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.

8. 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.