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This process is used to coat or laminate paper, with the aim of providing protection against moisture or grease, forming a barrier for dry, fresh packaging, or introducing a shiny surface for greater sales appeal.

Resin is extruded from a slot die at high temperature (up to 320oC) directly onto the moving paper web. Next it is rolled to apply pressure, and then cooled to return the molten resin to a solid state, which should leave the paper with the desired surface finish.

The flow and temperature of the plastic melt can adversely affect the surface finish of the final product. An automated monitoring system will inspect the continuous process to detect any unacceptable blemishes, ensuring a complete coverage of the paper, at a sufficiently high quality.
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