Technology and principle of extrusion coating machine

The technological process of the extruding coating machine is to extrude the plastic particles into a streamline melting state from the die mouth of the flat die after being plasticized by the screw,

It is attached to paper, film, non-woven fabric, woven fabric and other flexible substrates after stretching,

Composite materials with the barrier and heat sealing properties of the plastic film layer, the strength and toughness of the substrate and the functional properties are prepared by cooling, setting and pressing.

At present, the paper plastic flexible packaging industry has been developing continuously, ranging from shipbuilding to fast selling household appliances. The application of coated products is ubiquitous in life. The thermal insulation layer of air conditioners and refrigerators Glass fiber thermal insulation materials for building materials, including rainproof cloth, sunshade curtains, non-woven wardrobe, non-woven shopping bags, medical surgical gowns, surgical caps, and many types of clothing linings, luggage linings and other industries, are the embodiment of the extensive application of the coating process

The main systems of the film coating machine include unwinding system, extrusion system, molding traction system and winding system. It is composed of corona processing system, trimming system, EPC deviation correction system, temperature control system, tension control system and other auxiliary automation systems. Equipment of the previous process: granulator, printing press or other equipment; Equipment for the next process: slitter or other equipment.

According to different layers of substrate, it can be divided into single mold head coating machine (also known as single line), double mold head coating machine (also known as double line), and multi-layer coating machine.

Single layer coating machine is mainly used for products with single side coating requirements, such as advertising paper cups and packaging paper coating. Coffee cups and other coating processes, as well as more than 90% of medical packaging materials and medical materials on the domestic market are single coating materials.

Double layer coating machine is mainly used for coating double-sided paper cups, paper bowls and ice cream cups. PET film and carbon fiber cloth composite, PET or BOPP film and aluminum foil composite in industrial products. And paper and aluminum foil aluminized film composite materials. Considering its good heat sealing property, this kind of products will be coated with a layer of PE film on the surface of the molded products to facilitate the wide application of the later products.