Method for manufacturing a rough-surfaced plastic sheet

Method for manufacturing rough-surfaced plastic sheet comprising,

• one main conventional extrusion machine used for forming a main body of a smooth plastic sheet;
• plastic material, pigment and processing agent mixed together to be filled in a barrel of said main extrusion machine, melted and mixed therein to extrude and mold a main body of a plastic sheet,
• one or two auxiliary extrusion machines filled with plastic material, pigment, processing agent and a proper amount of foaming agent, which are melted and mixed together in a barrel of said auxiliary extrusion machine(s), said foaming agent heated to decompose and produce gas large enough to let said plastic material form many bubbles and explode to form a rough-surfaced layer to be adhered on one or two sides of said main body;
• steps of manufacturing said rough-surfaced plastic sheets consisting of:
• (1). Mixing materials:
• Plastic material, pigment and processing agent mixed, melted together and fed into said barrel of said main extrusion machine A, a proper amount of foaming agent mixed in said material mixture and fed into said barrel of said auxiliary extrusion machine(s) B (and C);
• (2) Extrusion :
• Said plastic material, said pigment and said processing agent melted and mixed together in said barrel of said main extrusion machine, and is extruded to form a smooth main body of a plastic sheet;
• said plastic material, said pigment, said processing agent and said foaming agent melted and mixed together in said barrels of said auxiliary extrusion machines B and C, letting said foaming agent heated to decompose and produce gas with its amount large enough to form many bubbles and explode at the same time, thus a rough-surfaced layer formed on said plastic;
• (3). Molding in shape:
• Said main body and said rough-surfaced layer moved to said mold head and passing through said mold to let said rough-surfaced layer adhere to two sides of said main body to form a plastic sheet with two rough surfaces;
• (4). Cooling, rolling up and cutting into units:
• Said rough-surfaced plastic boards successively formed, rolled up and cut into units with a preset size;
• said rough-surfaced plastic sheet finished one by one in forming through one round of molding process, promoting producing efficiency, lowering investment coat and elevating competitive force.