Composite packaging materials requirements in each layer, outer layer, middle layer and inner layer, adhesive layer, etc

Composite bags laminated composite is actually mean, is the different nature of the film or other flexible material together, then through sealing, bearing, the purpose of the protection and decoration built-in objects. Bags laminated structure according to the different combination way, there can be many ways of classification. But practice general with the structure of outer layer, middle layer and inner layer, adhesive layer, etc. One, the outer material of outer material generally choose good mechanical strength, heat resistance, good printing effect and good optical function materials. Now is the most commonly used in the polyester ( PET) , nylon ( 纽约) , stretching polypropylene ( BOPP) , paper and other materials are two, the middle tier middle tier are commonly used to strengthen a characteristics of composite structure, such as barrier property, shading sex, sex, intensity, etc. Now 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, etc. Three, the inner lining materials is the most crucial effect in sealing. Within the inner structure of direct contact, thus non-toxic, tasteless, water resistant, oil resistant. Commonly used material is stretch poly acrylic ( CPP) , ethylene - Vinyl acetate copolymer ( EVA) , polyethylene ( PE) And their modified materials. Four, glue layer of the effect of the bonding layer is glued together in the adjacent two layers of information in the composition of 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 the important principle of comments on composite packaging material intrinsic function, different packaging requirements of the guideline is not the same.