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Composite bags of laminated composite is actually mean, is the different nature of the film or other flexible material together, then through sealing, bearing, protection and decoration built-in objects. Laminated structure of flexible packaging in accordance with the different combinations, there can be many forms of classification. But the structure of the conventional usually use outer and inner layer, such as glue layer to distinguish. （ A) Outer material outer usually choose good printing performance, heat resistance, good mechanical strength, good optical performance materials. At present the most commonly used is polyester ( PET) , nylon ( 纽约) , stretching polypropylene ( BOPP) , paper and other materials of outer material requirements and middle layer material is typically used to strengthen a certain characteristics of composite structure, such as barrier property, shading sex, sex, strength and other properties. At present is the most commonly used in the aluminum foil ( AL） , aluminum plating film ( VMCPP VMPET) , polyester ( PET) , nylon ( 纽约) , polyvinylidene chloride coated film ( KBOPP KPET,科尼) , EVOH material, etc. （ 3) The inner lining materials is the most critical role in the sealing property, inner structure in direct contact, so asked non-toxic, tasteless, water resistant, oil resistant. Commonly used material is stretch film poly acrylic ( CPP) , ethylene - Vinyl acetate copolymer ( EVA) , polyethylene ( PE) And their modified materials. Lining materials requirements and function shown in the following table: the inner material requirements and function ( 4) Is the role of adhesive bonding layer adjacent two layers of material together to form composite structures, according to the characteristics of the adjacent material and composite process, can use glue or adhesive resin as the bonding layer material. Adhesive bonding strength between the laminated by adhesive material is an important index of evaluating composite bags inner performance, different composite packaging requirements to the requirements of the indicators are also different.