The composite packaging bag takes a typical three-layer structure composite flexible packaging material as an example. The function and requirements of the outer substrate (surface layer) are shown in the following tableThe role of the outer substrateRequireeffectMechanical strengthTensile, tear-resistant, impact-resistant, friction-resistantBarrierMoisture proof, gas barrier, fragrance retention, UV protectionstabilityLight resistance, oil resistance, organic resistance, heat resistance, cold resistanceProcessabilityFriction, heat shrink curlhealth safetyLow taste, low odor, non-toxicothergloss, transparency, shading, whiteness, printabilityThe most important requirements for the outer layer of the composite packaging bag are high strength, good abrasion resistance, good gloss, heat resistance, good barrier properties, and good printability. The requirements and functions of the intermediate layer material (functional layer) are shown in the following tableThe role of the interlayer substrateRequireeffectMechanical strengthTensile, tensile, tear-resistant, impact-resistantBarrierWaterproof, air-proof, fragrance-preservingProcessabilityDouble-sided composite strengthothertransparent, darkThe most important requirements of the composite packaging bag for the middle layer material are certain strength, friendly barrier properties, and double-sided composite properties. The requirements and functions of the inner layer material (sealing layer) are shown in the following tableInner layer (sealing layer) functionRequireeffectMechanical strengthTensile strength, impact resistance, compression resistance, puncture resistanceBarrierFragrance retention, low adsorptionstabilityWater resistance, oil resistance, heat resistance, cold resistance, stress crack resistanceProcessabilityCoefficient of Friction, Hot Tack, Seal Contamination Resistance, Non-Crimpinghealth safetyLow taste, low odor, non-toxicotherTransparent, non-transparent, impermeable, easy to tearAfter fully understanding the customer’s requirements, the functional design and mechanism design of the composite packaging bag can be carried out according to the requirements and characteristics of each layer of materials, and then the processing technology and production process instructions can be further planned to complete the production of the packaging bag.
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