What is the surface skin-core foaming extrusion process like? What are the requirements for the equipment and molds?

What is the surface skin-core foaming extrusion process like? What are the requirements for the equipment and molds?

Surface skin layer micro-foaming extrusion molding is carried out during the extrusion process. In the extruder barrel, plastic, foaming agent, and various other additives are melted, mixed, and the foaming agent decomposes or boils, inert gas is injected under pressure, and sufficient extruder head pressure is established to prevent the foaming material from prematurely foaming near the extrusion die. The extruded material releases pressure and undergoes foaming molding as it exits the die, forming different required surfaces. The cooled and shaped parts perform cooling and shaping. The foamed products after cooling and shaping are then subjected to drawing and cutting. 
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