Composite material packaging bag printing method and product

Abstract

The invention discloses a composite material packaging bag printing method and a product. A composite material comprises an aluminum film or aluminum foil located on the outer layer, a PE film located on the inner layer and card paper located between the inner layer and the outer layer which are compounded together. Wherein the weight of the paperboard is 50-100 g, and a waterproof agent is further sprayed on a paperboard notch in the side face of the finished product packaging bag. Due to the composite structure, the packaging bag is attractive in surface, resistant to abrasion, moisture and water, good in supporting performance and not prone to deformation, meanwhile, the packaging bag has the advantages of being low in carbon, environmentally friendly, renewable and the like, the environmental applicability of the packaging bag is improved, the packaging quality is guaranteed, the packaging bag can be suitable for the packaging process of various foods, and the requirement for large-batch and rapid processing is met.

Description

Technical Field

[0001] The invention relates to a composite material packaging bag printing method and a product used for food packaging, belonging to the field of printing and packaging. Background Art

[0002] In the market, common food packaging bags are mainly plastic bags and paper bags. Among them, plastic bags are light, small, cheap, have certain toughness, are moisture-proof, waterproof, oil-proof, etc., and are convenient for packaging various foods. However, plastic bags are non-degradable materials, causing serious environmental pollution and high carbon emissions. At the same time, the printing process has high plate-making costs, and the image printing has poor restoration and clarity, so they are gradually being eliminated. Paper bags used for food packaging are degradable, light, have certain wear resistance, are easy to print patterns, have clear images, and are economical, but they are not moisture-proof or waterproof, and their packaging performance is limited.

[0003] As the requirements for food packaging bags in life become higher and higher, designing a packaging bag made of composite materials for food packaging has become the main problem that the present invention intends to solve. Summary of the invention

[0004] In view of the above-mentioned existing situation, the present invention aims to provide a composite material packaging bag with good durability and strong versatility and a printing method thereof, so as to improve the shortcomings of the existing packaging bags during use, enhance the applicability and aesthetics of the packaging bags, reduce carbon emissions and environmental pollution during production and use, and meet the ever-increasing consumer needs.

[0005] The present invention is achieved through the following technical solutions: The printing method of composite material packaging bag comprises the following specific steps: Step 1: Compound the rolled aluminum film or aluminum foil with the rolled cardboard through a compounding machine.

[0006] Step 2: Cut the composite cardboard as needed to form a single sheet of composite cardboard.

[0007] Step 3: Use a flat offset printing machine to perform UV printing on the aluminum film or aluminum foil surface of the single-page composite cardboard to form an outer packaging surface.

[0008] Step 4: Use a laminating machine to coat the paper side of the printed single-page composite cardboard with a PE film.

[0009] Step 5: Fold the PE film sides of the single-page composite cardboard in half and hot-melt bond them together through a bag-making machine to form a pocket-shaped semi-finished product.

[0010] Step 6: stack the pocket-shaped semi-finished products on each other, flatten and trim them with a flattening machine to form bag-shaped products of the required size, and finally spray waterproofing agent or perform hot stamping treatment on the exposed paper edges on the cuts, and the composite material packaging bag is completed.

[0011] The cardboard weighs 50-100 grams.

[0012] The spray waterproofing agent is spray liquid wax or spray plastic.

[0013] A packaging bag made according to the above composite material packaging bag printing method, the packaging bag is made of a composite material, the composite material includes an aluminum film or aluminum foil on the outer layer, a PE film on the inner layer, and a cardboard between the inner and outer layers. The cardboard is 50-100 grams.

[0014] The side cardboard cutouts of the packaging bag are sprayed with a waterproofing agent.

[0015] The waterproofing agent is liquid plastic or liquid wax.

[0016] The beneficial effects of the composite material packaging bag printing method and the product of the present invention include: 1. The packaging bags made of three-layer composite materials are wear-resistant, moisture-proof, waterproof, beautiful in appearance, good in support, not easy to deform, and low-carbon, environmentally friendly, and renewable, which effectively improves the applicability of packaging bags and meets the needs of modern life for packaging products; 2. By spraying waterproof agent on the exposed paper edge after trimming, the cut is effectively protected, avoiding the delamination and cracking of the composite material during water immersion and moisture exposure, further improving the use quality of the packaging bag, ensuring the use quality, and making the packaging bag have strong waterproof effect both inside and outside, especially suitable for relatively humid environment; 3. Reduce the use of polyethylene plastics, improve environmental performance, and reduce carbon emissions; 4. Compared with the plastic packaging bags printed by gravure printing machines in the past, the pattern clarity and color reproduction of offset printing are significantly improved, and the packaging effect and packaging quality are significantly improved; 5. It can be applied to the packaging process of various foods and meets the needs of large-scale and rapid processing. DETAILED DESCRIPTION

[0017] The present invention is described in further detail below: The composite material packaging bag printing method of the present invention specifically comprises the following steps: Step 1: Compound the rolled aluminum film and the rolled 80g cardboard by a compounding machine.

[0018] Covering the 80g cardboard with aluminum film can not only increase the waterproof and moisture-proof properties of the cardboard surface, but also improve the wear resistance of the cardboard surface, meet the use requirements of packaging bags, and improve the applicability of the packaging process. Of course, the gram weight of the cardboard should be controlled between 50-100g to meet the requirements of saving and low carbon.

[0019] Step 2: Cut the composite cardboard as needed to form a single sheet of composite cardboard.

[0020] The laminated cardboard needs to be cut into single sheets before printing to meet the printing requirements of the flat offset printing machine. In this example, according to the size requirements of making packaging bags, the roll of laminated cardboard is first cut into corresponding sizes.

[0021] Step 3: Use a flat offset printing machine to perform UV printing on the aluminum film surface of the single-page composite cardboard to form an outer packaging surface.

[0022] The pattern and text are printed on the aluminum film surface by UV technology, and the printing is carried out by flat offset printing machine, which ensures the clarity of printing and the reproduction of colors, making the packaging more beautiful. It avoids the problems of poor image clarity, low accuracy, poor color reproduction, etc. caused by direct printing on plastic bags by gravure printing machines in the past.

[0023] Step 4: Use a laminating machine to coat the paper side of the printed single-page composite cardboard with a PE film, and use a bag making machine to fold the PE film sides of the single-page composite cardboard in half and hot-melt bond them to form a pocket-shaped semi-finished product.

[0024] In order to improve the applicability of the inside of the packaging bag, in this example, a PE film is also required on one side of the paper surface of the single-page composite cardboard. The PE film is used to form the waterproof and moisture-proof properties of the inside of the packaging bag, which reduces the demand for plastics and improves environmental protection while ensuring the quality of use. At the same time, the required pocket-shaped semi-finished product is quickly formed by mutual hot melting and bonding of the PE film after folding, which facilitates the processing process and meets the processing requirements of the existing bag-making machine.

[0025] Step 5: stack the pocket-shaped semi-finished products on each other, flatten and trim them with a flattening machine to form bag-shaped products of the required size, and finally spray waterproofing agent on the exposed paper edges on the cuts, and the composite material packaging bag is completed.

[0026] The stacked pocket-shaped semi-finished products are flattened by a flattening machine, and the packaging bags are trimmed and cut by trimming to finally form the required packaging bag size. In order to further improve the performance of the composite material packaging bag, the exposed paper edges formed during the trimming process are waterproofed by spraying a waterproofing agent to ensure that the cuts will not be delaminated or cracked due to water immersion or moisture during later use. Of course, the cut paper edges can also be treated with moisture-proofing by hot stamping. In this case, the waterproofing agent can be liquid plastic or liquid wax.

[0027] The packaging bag made by the printing method of the composite material packaging bag is made of a composite material, and the composite material includes an aluminum film on the outer layer, a PE film on the inner layer, and a cardboard between the inner and outer layers. The cardboard used is 80 grams.

[0028] In order to further improve the performance of the packaging bag, a waterproof agent is sprayed on the cardboard cut on the side of the packaging bag. In this example, the waterproof agent is liquid wax. After spraying the liquid wax, the exposed cut of the packaging bag is fully sealed and protected, ensuring the waterproof and moisture-proof performance of the inside and outside of the packaging bag.

Claims

1. A method for printing composite material packaging bags, characterized in that: The specific steps include: Step 1: Compounding the rolled aluminum film or aluminum foil with the rolled cardboard by a compounding machine; Step 2: Cut the composite cardboard as needed to form a single sheet of composite cardboard; Step 3: Use a flat offset printing machine to perform UV printing on the aluminum film or aluminum foil surface of the single-page composite cardboard to form an outer packaging surface; Step 4: Use a laminating machine to coat the paper side of the printed single-page composite cardboard with a PE film; Step 5: Fold the PE film sides of the single-sheet composite cardboard in half and hot-melt bond them together through a bag-making machine to form a pocket-shaped semi-finished product; Step 6: stack the pocket-shaped semi-finished products on each other, flatten and trim them with a flattening machine to form bag-shaped products of the required size, and finally spray waterproofing agent or perform hot stamping treatment on the exposed paper edges on the cuts, and the composite material packaging bag is completed.

2. The composite material packaging bag printing method according to claim 1, characterized in that: The cardboard weighs 50-100 grams.

3. The method for printing composite material packaging bags according to claim 1, characterized in that: The spray waterproofing agent is spray liquid wax or spray plastic.

4. A packaging bag made according to the composite material packaging bag printing method according to any one of claims 1 to 3, characterized in that: The packaging bag is made of a composite material, which includes an aluminum film or aluminum foil on the outer layer, a PE film on the inner layer, and cardboard between the inner and outer layers; the cardboard weighs 50-100 grams.

5. The packaging bag according to claim 4, characterized in that: The side cardboard cutouts of the packaging bag are sprayed with a waterproofing agent.

6. The packaging bag according to claim 5, characterized in that: The waterproofing agent is liquid plastic or liquid wax.