Testing of multi-layer co extruded films for food packaging

This standard specifies the terms, definitions, abbreviations and symbols, classification, requirements, test methods, inspection rules, markings, packaging, transportation, and storage of raw materials for multi-layer co extruded films and bags used in food packaging. This standard applies to non printed films and bags for multi-layer food packaging produced by co extrusion process using food grade packaging resin with a thickness of less than 0.30mm. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 191 Packaging, Storage, and Transportation Graphical Symbols GB/T 1037 Plastic Film and Sheet Materials - Water Vapor Permeability Test Method - Cup Method GB/T 1038 Plastic Film and Sheet Gas Permeability Test Method - Pressure Difference Method GB/T1040.3- Determination of Plastic Tensile Properties - Part 3: Test Conditions for Film and Sheet GB/T 2410 Transparent Plastics - Test Methods for Light Transmittance and Haze GB/T 2828.1- Sampling and Inspection Procedures by Attributes - Part 1; By Acceptance Quality Limit (AQL) Sampling Plan for Retrieved Batch Inspection GB/T2918 Standard Environment for Conditioning and Testing of Plastic Specimens GB/T 5009.60 Analysis Methods for Hygienic Standards of Polyethylene, Polystyrene, and Polypropylene Formed Products for Food Packaging GB/T 6672 Determination of Plastic Film and Sheet Thickness Mechanical Measurement Method GB/T 6673 Determination of Length and Width of Plastic Film and Sheet GB/T 8808 Peel Test Method for Soft Composite Plastic Materials GB/T 9639.1 Impact Resistance of Plastic Film and Sheet Test methods - Free fall dart method - Part 1: Step method GB9685 Hygienic standard for the use of additives in food containers and packaging materials GB9687 Hygienic standard for polyethylene formed products in food packaging GB9688 Hygienic standard for polypropylene formed products in food packaging GB/T 21302 Packaging composite films - General principles for bags QB/T 1130 Test method for right angle tear performance of plastics QB/T2358 Method for determining the thermal bond strength of plastic film packaging bags 3 Terminology Definitions and Abbreviations and Symbols 3.1 Terms and Definitions The following terms and definitions apply to this document. 3.1.1 Coextrusion film is a multi-layer composite film obtained by using two or more extruders to extrude multiple different or identical polymer melts through a common die

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