Special CPP film for improving ink adhesion

Abstract

The utility model relates to CPP film technical field, concretely is a kind of special CPP film for improving ink adhesion, including CPP film body, the CPP film body includes printing layer, support layer, isolation layer, bonding layer and heat seal layer, the printing layer is located CPP film outer surface layer, for providing adhesion layer for ink;The support layer is located the lower surface of printing layer, for providing support skeleton for CPP film;The isolation layer is located the lower surface of support layer, for blocking gas molecules and water molecules;The heat seal layer is located the lower surface of isolation layer, for with the other side of packing and is pasted together.The utility model uses relatively thick homopolymer polypropylene as support layer, improves the mechanical strength of CPP film, prevents its water molecules in food from seeping out due to deformation, contact printing layer, make ink on it fall off;By setting isolation layer under support layer, reduce the permeability of CPP film, prevent water molecules in food from seeping out and contact ink, to improve the ink adhesion of printing layer.

Description

Technical Field

[0001] This utility model relates to the field of CPP film technology, and in particular to a special CPP film for improving ink adhesion. Background Technology

[0002] CPP film, or cast polypropylene film, is a film produced through a multi-layer co-extrusion process. This process combines resins with different properties into a single film, giving it multiple functions. It features high transparency, good heat-sealing properties, and resistance to acids and alkalis, making it one of the core materials in the flexible packaging field. To achieve the required printing effects, durability, and security in packaging, the surface of CPP film must be modified using techniques such as corona treatment to increase its surface energy, thereby obtaining strong, high-quality printed patterns and enabling its widespread application in the printing and packaging industry.

[0003] Traditional CPP film is easily deformed, resulting in reduced strength and increased permeability. When the packaged contents contain a large amount of moisture, such as pre-cooked dishes or pickled foods, the moisture can easily penetrate into the ink layer, causing the ink to peel off and reducing its adhesion. Summary of the Invention

[0004] The main objective of this invention is to provide a special CPP film that improves ink adhesion, thereby solving the problems raised in related technologies.

[0005] To achieve the above objectives, according to one aspect of the present invention, a special CPP film for improving ink adhesion is provided, comprising a CPP film body, wherein the CPP film body includes: A printing layer, located on the outer surface of the CPP film, serves to provide an adhesion layer for inks; A support layer, located on the lower surface of the printed layer, is used to provide a support framework for the CPP film; An isolation layer, located on the lower surface of the support layer, is used to block gas molecules and water molecules; A heat-sealing layer, located on the lower surface of the insulating layer, is used to adhere to the other side of the packaging to form a packaging bag; An adhesive layer, located between the insulating layer and the heat-sealing layer, is used to bond the two together.

[0006] Furthermore, the printed layer is made of ternary copolymer polypropylene with a thickness of 3~12μm.

[0007] Furthermore, the support layer is made of homopolymer polypropylene with a thickness of 15~20μm.

[0008] Furthermore, the insulating layer is made of ethylene-vinyl alcohol copolymer and has a thickness of 6~10μm.

[0009] Furthermore, the heat-sealing layer is made of binary copolymer polypropylene with a thickness of 8~15μm.

[0010] Furthermore, the adhesive layer is made of maleic anhydride-grafted polyolefin and has a thickness of 3~8 μm.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention uses a thicker homopolymer polypropylene as a support layer to improve the mechanical strength of the CPP film and prevent water molecules in the food from seeping out and contacting the printing layer due to deformation, causing the ink on it to fall off. By setting an isolation layer under the support layer, the permeability of the CPP film is reduced, preventing water molecules in the food from seeping out and contacting the ink, thereby improving the ink adhesion of the printing layer. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0013] Figure 2 This is a partially enlarged schematic diagram of the present invention.

[0014] Figure label: 1. CPP film body; 11. Printing layer; 12. Support layer; 13. Separator layer; 14. Heat-sealing layer; 15. Adhesive layer. Detailed Implementation

[0015] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0016] This embodiment provides a special CPP film for improving ink adhesion, such as... Figure 1 As shown, it includes a CPP film body 1, such as Figure 2 As shown, the CPP film body 1 includes: Printed layer 11, located on the outer surface of the CPP film, is used to provide an adhesion layer for inks; Support layer 12, located on the lower surface of printed layer 11, is used to provide a support skeleton for CPP film; The isolation layer 13 is located on the lower surface of the support layer 12 and is used to block gas molecules and water molecules. Heat-sealing layer 14 is located on the lower surface of the isolation layer 13 and is used to adhere to the other side of the packaging to form a packaging bag.

[0017] The printing layer 11 is made of ternary copolymer polypropylene with a thickness of 3~12μm. Ternary copolymer polypropylene contains ethylene monomers, which have more disordered molecular chains, are easier to modify, have stronger surface polarity, and have better ink affinity. Chlorinated polypropylene is added to the ternary copolymer polypropylene as an anchoring agent, and the two have good compatibility. Chlorinated polypropylene contains polar groups that can bind with ink resin, further improving the adhesion of the ink.

[0018] The support layer 12 is made of homopolymer polypropylene with a thickness of 15~20μm. Homopolymer polypropylene is inexpensive, which helps control costs, and it has excellent rigidity, impact resistance and tear resistance, which improves the mechanical strength of CPP film.

[0019] The isolation layer 13 is made of ethylene-vinyl alcohol copolymer with a thickness of 6~10μm. The ethylene-vinyl alcohol copolymer molecular chain contains a large number of hydroxyl groups, and the intermolecular forces are strong, forming a dense hydrogen bond network, which can effectively block water molecules and prevent moisture in food from penetrating into the support layer 12.

[0020] The heat-sealing layer 14 is made of binary copolymer polypropylene with a thickness of 8-15 μm. Binary copolymer polypropylene has a low initial sealing temperature, high heat-sealing strength, good thermal adhesion, and a wide heat-sealing temperature range, making it easy to heat-seal into a high-strength, airtight packaging bag. The introduction of ethylene units into the binary copolymer polypropylene lowers the melting point of the heat-sealing layer 14, allowing it to melt and bond well at low temperatures to form the packaging bag.

[0021] The adhesive layer 15 is made of maleic anhydride-grafted polyolefin with a thickness of 3-8 μm. The maleic anhydride active groups of the maleic anhydride-grafted polyolefin react chemically with the hydroxyl groups of the isolation layer 13 and the heat-sealing layer 14 to form strong chemical bonds, while its own polyolefin segments are tightly bonded to the isolation layer 13 and the heat-sealing layer 14 through intermolecular forces and co-crystallization, so that the isolation layer 13 and the heat-sealing layer 14 are tightly connected into a whole.

[0022] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A special CPP film for improving ink adhesion, comprising a CPP film body (1), characterized in that, The CPP film body (1) is a five-layer co-extruded composite cast polypropylene film, which consists of a printing layer (11), a support layer (12), a separation layer (13), an adhesive layer (15), and a heat-sealing layer (14) from the outside to the inside. A printing layer (11) is located on the outer surface of the CPP film and is used to provide an adhesion layer for ink. The printing layer (11) is made of ternary copolymer polypropylene and has a thickness of 3~12μm. A support layer (12) is located on the lower surface of the printed layer (11) and is used to provide a support skeleton for the CPP film. The support layer (12) is made of homopolymer polypropylene and has a thickness of 15~20μm. An isolation layer (13) is located on the lower surface of the support layer (12) and is used to block gas molecules and water molecules. The isolation layer (13) is made of ethylene-vinyl alcohol copolymer and has a thickness of 6~10μm. A heat-sealing layer (14) is located below the isolation layer (13) and is used to adhere to the other side of the packaging to form a packaging bag. The heat-sealing layer (14) is made of binary copolymer polypropylene and has a thickness of 8~15μm. An adhesive layer (15) is located between the isolation layer (13) and the heat-sealing layer (14) for bonding the two together. The adhesive layer (15) is made of maleic anhydride-grafted polyolefin and has a thickness of 3 to 8 μm.

2. The special CPP film for improving ink adhesion according to claim 1, characterized in that, The ternary copolymer polypropylene of the printed layer (11) contains chlorinated polypropylene anchoring agent.

Images