The content of the film is different, and the performance requirements of the composite roll film are also different. Some products require strong barrier properties of composite film rolls , and some products have higher requirements for non-toxic and odorless. How to choose suitable substrate and design composite roll film for these requirements The structure is particularly noteworthy. In this issue, the editor brings the structural design of the composite roll film to you for your reference.
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When designing the structure of the composite roll film , we must first meet the functional requirements of the product for packaging, and then comprehensively consider the finished product, environmental protection and other factors, and try to use economical and easy to recycle materials. Since the functionality of the composite roll film occupies a dominant position in the structural design, here, the author only discusses the structural design of the composite roll film from a functional perspective.
The composite roll film that meets the requirements of cooking can withstand high temperature sterilization. Basically, aluminum foil with shading performance is used as the intermediate layer, PA and PET with good printability are used as the outer layer, and PE and PP with good heat sealing performance are used as the inner layer. . At present, some aluminized materials with high barrier properties are also widely used. Common multi-layer composite roll film structures include PET // CPP, PET // Al // CPP, PA // Al // CPP, VMPET // CPP, PET // PA // CPP, etc.
The high-barrier composite roll film has the properties of moisture resistance, gas barrier, shading, aroma preservation, etc. It is commonly used in the packaging of biscuits, potato chips, puffed foods, etc., as well as the moisture protection of foods such as rice snacks, fried foods, tea, soup powder Fragrant packaging. Such products are generally stored at room temperature, so its flexible packaging must have high barrier properties and must have oil resistance. Commonly used multi-layer composite structures are BOPP // VMCPP, BOPP // PET // CPP, BOPP // VMPET // CPP, BOPP // Al // PE, BOPP // VMPET // PE, matting BOPP // VMCPP, PA // VMPET // PE, paper // Al // PE, PET // paper // PE, PET // EVOH // CPP, etc.
Temperature-resistant composite roll film It has high and low temperature resistance and can meet the requirements of high temperature cooking and low temperature preservation. It is often used in the packaging of frozen food, carbonated drinks and some foods that can be stored at low temperature (such as chocolate). Commonly used multi-layer composite structures are BOPP // PE, matting BOPP // PE, PA // Al // PET // PE, BOPP // EVA, etc.
The chemical resistance of the composite roll film mainly refers to the resistance to acids and alkalis, especially the inner layer materials in contact with the contents have higher resistance to acids, alkalis and organic solvents. This type of composite flexible packaging is mainly used for the packaging of daily necessities, food and condiments. Commonly used multi-layer composite structures are PET // Al // PA // CPP, PET // Al // PET // CPP, PET // CPP, etc.
Some contents require that the packaging materials have certain mechanical properties, such as candy, decorations, etc. require that their packaging have kinks, so they are often made of PVC, PT and other materials. For some heavier products, materials with good puncture resistance and impact resistance must be used, such as meat, rice and other commodities. The flexible packaging structure can be PA // PE.
Aseptic composite roll film can minimize the growth of bacteria without preservatives and at normal temperature, maintain the original ingredients and flavor of the contents, and facilitate storage. Sterile composite flexible packaging should have excellent barrier performance, especially for O2, CO2, N2 and other gases, and its barrier performance will not be significantly reduced due to changes in external temperature and humidity. Commonly used multi-layer composite structures are PA // EVA, PA // PE, PA // EVOH // PE, PET // EVOH // CPP, PA // Al // CPP, PA // Al // CPP, etc.
Gifts, decorations, and other products with high appearance requirements can use some processed substrates, such as VMBOPP, which has a transparent surface, good shading effect after aluminum plating, and beautiful appearance; there are various types of pearlescent films, and pearls on their surfaces Gloss has a good visual effect. The PVA has good environmental performance and high anti-static performance, and can be used as a composite film material for shirts, sweaters and other fabrics.
This article is transferred from: WeChat: yinshuajishu1957
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