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What is a composite film? What are they made of?
2022-11-01
1, composite film refers to a variety of plastic and paper, metal or other materials through lamination extrusion veneer, co-extrusion and other technology to combine the substrate together and form a multilayer structure of the film. Composite film is generally composed of substrate, laminating agent, barrier material, heat sealing material, printing and protective coating. The commonly used composite membrane structure is: surface layer/adhesive layer 1/ intermediate barrier layer/cat bonding layer 2/ inner thermal sealing layer. In the composite film process, the structure of a multilayer composite material is usually denoted in shorthand. For example, a typical medicinal composite film can be expressed as: surface layer/printing layer/composite layer/aluminum foil/adhesive inner layer (heat seal layer).
2, the common structure of composite membrane is mainly: Double layer composite such as PT/PE, paper/aluminum foil, paper /PE, PET/PE, PVC/PE, NY/PVDC, PE/PVDC, PP/PVDC, etc. Three-layer composite such as BOPP/PE/OPP, PET/PVDC/PE, PET/PT/PE, PT/AL/PE, wax/paper /PE, etc. Four-layer composite such as PT/PE/BOPP/PE, PVDC/PT/PVDC/PE, paper/aluminum foil/paper /PE, etc. Five-layer composite such as PVDC/PT/PE/AL/PE. Six layers of composite such as PE/ paper /PE/AL/PE/PE etc. |