The composite in the composite flexible packaging material used in the packaging cover film actually means lamination, which is to bond together films or other flexible materials of different properties, and then seal them to carry, protect and decorate the contents. The laminated structure of flexible packaging can be classified in many forms according to different combinations. However, the conventional structure is usually distinguished by outer layer, middle layer, inner layer, adhesive layer, etc.(I) Outer layer materials

The outer layer materials are usually selected from materials with good mechanical strength, heat resistance, good printing performance, and good optical properties. The most commonly used are polyester (PET), nylon (NY), stretched polypropylene (BOPP), paper and other materials.

Requirements and functions of outer layer materials

The middle layer materials are usually used to enhance a certain characteristic of the composite structure, such as barrier properties, light-shielding properties, fragrance retention, strength and other characteristics. The most commonly used are aluminum foil (AL), aluminized film (VMCPP, VMPET), polyester (PET), nylon (NY), polyvinylidene chloride coated film (KBOPP, KPET, KONY), EVOH and other materials.

(III) Inner layer material

The most critical function of the inner layer material is sealing. The inner layer structure is in direct contact with the inner content, so it is required to be non-toxic, odorless, water-resistant and oil-resistant. Commonly used materials are cast polypropylene (CPP), ethylene-vinyl acetate copolymer (EVA), polyethylene (PE) and its modified materials.

(IV) Adhesive layer

The function of the adhesive layer is to bond two adjacent layers of materials together to form a composite structure. According to the characteristics of the adjacent materials and the composite process, adhesives or adhesive resins can be used as adhesive layer materials. The bonding strength between the adhesive layer and the bonded materials is an important indicator for evaluating the intrinsic performance of composite packaging materials. Different packaging requirements have different requirements for this indicator.

Product features: The product has high barrier properties, oil resistance, light blocking, fragrance preservation, and freshness preservation. It can be customized according to the size of the product. The delivery cycle is shorter than bag making and the cost is lower than bag making. The product meets environmental protection requirements, with a new printing process that highlights the pattern design and trademark effect. Special trademarks or patterns can be designed to achieve a good anti-counterfeiting effect. It can also highlight the high-end and unique shelf effect of the product.

·Specification and size: Made according to the actual needs of customers

·Application distribution: Suitable for various automatic packaging machinery, products include food, daily chemicals, medicine, electronics, hardware parts and other industrial packaging.

·Packaging type: roll film

·Contents: milk film, food packaging film

·Material combination: polyester (PET), nylon (NY), oriented polypropylene (BOPP), paper, aluminum foil (AL), aluminized film (VMCPP, VMPET), polyester (PET), nylon (NY), polyvinylidene chloride coated film (KBOPP, KPET, KONY), EVOH, cast polypropylene (CPP), ethylene-vinyl acetate copolymer (EVA), polyethylene (PE) and its modified materials, etc.