A method of making synthetic polymer pellet feedstock having a high concentration of an anti-microbial agent includes the steps of: introducing a polymer into a mixing vessel; introducing a polysiloxane dispersant into the mixing vessel; introducing an anti-microbial agent comprised of a powdered metal material into the mixing vessel; heating and mixing the polymer, the polysiloxane dispersant and the anti-microbial agent to form a molten blend that exhibits a generally homogenous dispersal of the anti-microbial agent; extruding the molten blend to form filaments; and cutting the filaments to form metalized synthetic polymer pellet feedstock. The powdered metal material includes particles of silver in metallic or salt form measuring between about 2 micrometers and about 12 micrometers and particles of copper in metallic or salt form measuring between about 2 micrometers and about 12 micrometers.

A process for grinding materials includes grinding a frozen plastic material to form a first-stage plastic material in a first mill. The first-stage plastic material is processed in a second mill to form material having a particle size less than about 100 m.

A plastic floor tile structure and a method for manufacturing the same are provided. The plastic floor tile structure includes a base layer, a middle layer, and a surface layer. The middle layer is disposed between the base layer and the surface layer. The middle layer is formed from a resin composition. The resin composition includes 100 phr of a polyvinyl chloride resin, 5 phr to 20 phr of a plasticizer, 4 phr to 15 phr of a heat stabilizer composition, 0.5 phr to 3 phr of an accelerant, 1 phr to 5 phr of a toughener, 0.1 phr to 0.5 phr of a lubricant composition, and 0.1 phr to 1 phr of an antioxidant. The heat stabilizer composition includes a calcium-zinc stabilizer and an auxiliary stabilizer. The accelerant is a copolymer polymerized from a vinyl chloride monomer and a polyester monomer.

In a tower integrated by the heating and drying section and the cooling section, both sides of the heating and drying section housing are provided with an air inlet box and an air outlet box; the air inlet box is communicating with a heat exchanger and distribution pipes in the heating and drying section housing, the air outlet box is communicating with distribution pipes in the heating and drying section housing and a dust remover; both sides of the cooling section housing are provided with an air inlet box and an air outlet box; the air inlet box is communicating with a heat exchanger and distribution pipes in the cooling section housing; the air outlet box is communicating with distribution pipes in the cooling section housing and a dust remover. The integral device improves the heat exchange effect and preventing the polypropylene particles from aging.