Temperature is the primary factor of pre-coating film, because the adhesive on the pre-coating film is hot-melt adhesive, the temperature determines the melting state of the hot-melt adhesive, and determines the hot-melt adhesive molecules to BOPP film, printed ink layer, paper, etc. Penetration and diffusion capacity. Although the increase of the coating temperature helps to increase the bonding strength, too high temperature will cause the film to shrink, the product surface will shine and blisters, and the product will wrinkle. According to practical experience, the temperature of the film should be controlled between 70 ~ 100 ℃.

        The surface of the paper of the laminating machine is not flat. Only under the appropriate pressure, the hot-melt adhesive in the molten state can completely cover the surface of the printed product, the laminating product is bright, and the bonding effect from the laminating machine is good. The pressure is small, and the bonding is not strong; the pressure is higher, which helps to improve the bonding force between the film and the paper product. However, if the pressure is too high, it is easy to wrinkle the product, and it is easy to damage and deform the surface of the rubber roller and reduce the service life of the rubber roller. As the pressure increases, the contact pressure between the rubber roller and the heating roller increases, which increases the load on the shaft head and bearing of the two rollers of the laminating machine, which increases the wear and aggravates the load on the transmission system. Too much pressure will affect the service life of the whole machine.