The difference between dry type composite membrane and extrusion composite membrane and the advantages and disadvantages

Dry type composite membrane and extrusion composite membrane technology ( 1) Dry compound process is adhesive coating on a layer of thin film, after drying oven, hot pressing with another layer of film laminating into composite membrane process. It is suitable for various substrate film, base material with higher degrees of freedom, can produce various kinds of excellent performance of composite membrane, such as heat resistance, oil resistance, high separation and chemical resistance of film, etc. （ 2) Extrusion compound process is also called the extrusion coating, film, etc. , it is also one common method in composite membrane composite technology, mainly through the extruder as after a certain heating molten thermoplastic adhesive, with one or more of the following compound base material together, through the press roll layer formed after cooling. Dry type composite membrane and the distinction between extrusion composite membrane using ( 1) High temperature resistance, no high temperature resistance to resin used in complex, not a requirement of resistance to high temperature cooking or boiling treatment purposes. According to the different purposes and dry reusable adhesive is used, the basic can be apply to all USES. ( 2) Stiffness: dry copy 2 - coated on the substrate 8 g/m2 ( Solid content) After waiting for adhesive curing, its stronger stiffness. When requirements constitute a big stiffness, can choose the way to dry after processing. （ 3) Flexibility: when asked soft, crowded suitable for complex processing way. （ 4) Solvent residue: dry fully dry after processing requirements, but some high-grade packaging purposes of processing, solvent residue there may be a problem. Similar to these USES, can choose to squeeze after processing way. （ 5) Crowded after processing is the smell of decomposition of PE. （ 6) Cost: crowded way after processing cost is low, so the two ways can be applicable, will adopt the crowded after processing. Dry type composite is suitable for many varieties, the production of small composite film production; The composite extrusion is best suited for a large number of continuity of production. Dry type composite high production costs; Composite extrusion production cost is relatively low. Dry compound process under the condition of normal, peel strength, Plastic/plastic composite) Generally in 1 ~ 3. 5 n / 15 mm, suitable for most of the product requirements: peel strength composite extrusion in the general technical conditions, Plastic/plastic composite) To zero. 7 ~ 1. 5 n / 15 mm, adapted to the general packaging materials, for the product with high peel strength requirement, must join the thermal bonding resin, with hot bonding resin composite, peel strength can reach 10 n / 15 mm, even higher. Dry type composite using adhesive and coating weight is bigger, easy to residual solvent, to fully meet the health requirements, process control is difficult; Composite extrusion basic need not or only use water-based coating agent ( Coating weight seldom) , no solvent residual, health performance is better. Dry type composite film thickness uniformity is determined by the selected base material quality, fail to adjust; Composite extrusion must adjust the film thickness uniformity and average thickness. Dry type composite production operation easy, workers of technical quality requirements in general; Composite extrusion production operation is relatively complex, high technical requirements for workers. Different composite products in dry type composite technology change is not big, composite extrusion process requires constant adjustment, the requirement of process engineer is higher. Dry type composite with the environmental pollution caused by the solvent evaporation and the safe operation and labor health problems; Composite extrusion existence environment, higher temperature and sometimes have the problem of smoke.