What is the coating process of paper

Most of the paper used for food-related needs to be coated, because of the need for water and oil resistance. Thus PE coated cupstock is very common in our life.

So how does ordinary paper become coated?

We put polyethylene (usually referred to as PE particle raw material) through high temperature into liquid flow glue, after professional roller equipment coated on the surface of the paper, after cooling equipment treatment, flow polyethylene evenly and firmly together with the paper, this is what we usually call coated paper.

pe coating (2)

The base paper used for coating must meet the following quality requirements:
(1) High green strength.
(2) Good processing performance.
(3) It has the ability to resist edge penetration.
(4) It has the ability to resist condensate (when the single-sided coated base paper is filled with cold liquid, it will produce condensate on the outside of the paper).
(5) It has the ability to resist the penetration of paper.

base paper

The base material is added to the lamination system by the unwinding machine through various pre-treatment stations, thickness gauges and pre-heating devices. A single or multilayer polymer melt is processed in an extruder and applied to the substrate through a special slot die head. By guiding the polymer film on a cooling roller, the film is firmly adhered to the substrate and will not be separated by water, solvents, or high temperatures. Subsequently, the multilayer reel can be pre-machined with a suitable slitting device.

Lamination Machine

Covered in paper PE (polyethylene) material has good tensile toughness, so the film surface has the function of protecting the product from scratches; After the water test, the membrane surface is impermeable to air and water, and has a good moisture-proof effect; The surface of coated fbb can be sealed by high-frequency wave or 130-200 degrees Celsius after high temperature, suitable for making bags packaging materials. Under this important hint: the base paper of the coating must be wrapped in a roll, sheet paper can not be coated.

pe coated paper


Post time: May-30-2022