PVC composite material, foam board, production method and apparatus thereof, and flooring

A flooring, comprising:

• a polyvinyl chloride polymer layer;
• and
• a polyvinyl chloride polymer foam layer, the polyvinyl chloride polymer foam layer being made by foaming of a polyvinyl chloride polymer composite material,
• the polyvinyl chloride polymer layer being bonded on the surface of the polyvinyl chloride polymer foam layer, wherein the polyvinyl chloride polymer composite material comprises:
• 40-60 parts by weight of polyvinyl chloride polymer;
• 40-60 parts by weight of light calcium carbonate;
• 0.8-1.2 parts by weight of composite foaming agent comprising an inorganic foaming agent and an organic foaming agent;
• 3-5 parts by weight of foam regulator;
• 2-4 parts by weight of toughener;
• 0.8-1.2 parts by weight of lubricant;
• and
• 1.5-2.5 parts by weight of stabilizer;
• wherein the ratio of the inorganic foaming agent to the organic foaming agent by weight in the composite foaming agent is ½-1, and
• wherein the polyvinyl chloride polymer foam layer is free of plant fibers.