In order to improve and stabilize the PVA wet barrier performance, simplified production process, lower production cost, make the performance of PVA composite film superior to market, PVA had to be modified.
Polyvinyl alcohol is without water resistant, because it is a hydrophilic hydroxyl (OH), if can be properly closed connected with hydroxyl groups, water resistance, can improve the water resistance of PVA thin films. PVA containing hydroxyl, all the typical reaction can occur polyol, a kind of multi function of polymer, in addition is not the case, can with the hydroxyl of PVA moderate crosslinking, PVA formed a strong three-dimensional structure of coating, stable air tightness of wet PVA condition, improve the water resistance ability.
Modified PVA adhesive, under normal temperature without crust, in the production of the time allowed for viscosity without rising phenomenon, the normal temperature normal temperature coating, adhesive, to provide a relaxed conditions for modified PVA composite coating film production. Due to the polar liquid greatly, improves the modified PVA and basement membrane adhesion, interlayer binding force can not be separated, can be directly on the surface coated with PE, BOPP, BOPA, BOPET films, a modified PVA / PE, the modified PVA / BOPP composite coating film, in order to further increase the packing decoration effects, but also the first printed on the BOPP substrate, and the modified PVA composite coating, further processing into BOPP and modified PVA / PE films. The modified PVA / PE film without any treatment in the PVA plane of color printing, the ink adhesion force is very strong.
Composite coating equipment suitable to multi function coating unit of PVA composite coating film production, the reverse roll coating head, hot air convection drying, micro tension transmission and other advanced structure, available one-step production of BOPP / modified PVA / PE, BOPP / PE, PET / PE composite membrane; also can be used in the production of self-adhesive, protective film, to achieve stable, uniform coating, energy saving and the use of a machine design goals.
After coated laminated units, air drying tunnel length is fixed, the drying rate of coating film by coating
Thickness, oven temperature and the film speed three to control, thicker films, Hong Daowen is low, then drying speed is slow. In order to ensure that the coating is dry, the film speed is very low, lost the meaning of industrial production. Therefore, the thickness of the coating is 5 to 8 microns, PVA coating process conditions through rapidly at 100 ℃ oven, it not only helps to improve the crystallinity of PVA, ensure that PVA's air tightness and water resistance, and is favorable for improving the production efficiency.
Polyvinyl alcohol is without water resistant, because it is a hydrophilic hydroxyl (OH), if can be properly closed connected with hydroxyl groups, water resistance, can improve the water resistance of PVA thin films. PVA containing hydroxyl, all the typical reaction can occur polyol, a kind of multi function of polymer, in addition is not the case, can with the hydroxyl of PVA moderate crosslinking, PVA formed a strong three-dimensional structure of coating, stable air tightness of wet PVA condition, improve the water resistance ability.
Modified PVA adhesive, under normal temperature without crust, in the production of the time allowed for viscosity without rising phenomenon, the normal temperature normal temperature coating, adhesive, to provide a relaxed conditions for modified PVA composite coating film production. Due to the polar liquid greatly, improves the modified PVA and basement membrane adhesion, interlayer binding force can not be separated, can be directly on the surface coated with PE, BOPP, BOPA, BOPET films, a modified PVA / PE, the modified PVA / BOPP composite coating film, in order to further increase the packing decoration effects, but also the first printed on the BOPP substrate, and the modified PVA composite coating, further processing into BOPP and modified PVA / PE films. The modified PVA / PE film without any treatment in the PVA plane of color printing, the ink adhesion force is very strong.
Composite coating equipment suitable to multi function coating unit of PVA composite coating film production, the reverse roll coating head, hot air convection drying, micro tension transmission and other advanced structure, available one-step production of BOPP / modified PVA / PE, BOPP / PE, PET / PE composite membrane; also can be used in the production of self-adhesive, protective film, to achieve stable, uniform coating, energy saving and the use of a machine design goals.
After coated laminated units, air drying tunnel length is fixed, the drying rate of coating film by coating
Thickness, oven temperature and the film speed three to control, thicker films, Hong Daowen is low, then drying speed is slow. In order to ensure that the coating is dry, the film speed is very low, lost the meaning of industrial production. Therefore, the thickness of the coating is 5 to 8 microns, PVA coating process conditions through rapidly at 100 ℃ oven, it not only helps to improve the crystallinity of PVA, ensure that PVA's air tightness and water resistance, and is favorable for improving the production efficiency.