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A method for separating a polymer such as polypropylene from a layered plastic material that includes a layer of polypropylene together with a layer of vinylidene chloride is provided. The layered plastic material is agitated in a bath of water and sand to wet the surfaces of the material. The layer

A method for separating a polymer such as polypropylene from a layered plastic material that includes a layer of polypropylene together with a layer of vinylidene chloride is provided. The layered plastic material is agitated in a bath of water and sand to wet the surfaces of the material. The layered plastic material is then agitated in a wash liquor of hot water, caustic, sand, and a surfactant to crack and strip the vinylidene chloride material from the polypropylene material. Sufficient caustic is included in the wash liquor to raise the pH of the wash liquor to pH 12 or greater. Agitation is by reversibly rotating a perforating basket containing the layered plastic material and the wash liquor at 10-20 revolutions per minute and by blowing air into the basket. The wash liquor and stripped vinylidene chloride are then drained away from the polypropylene. The polypropylene is rinsed with water to wash away residual wash liquor and stripped vinylidene chloride. Water is extracted from the rinsed polypropylene, which then may be extruded for reuse.

대표청구항 ▼

A method of processing a layered plastic material having a polypropylene layer with a polymeric vinylidene chloride layer, comprising the steps of: providing a washing machine having a basket that is perforated so as to pass water and said polymeric vinylidene chloride therethrough after said layere

A method of processing a layered plastic material having a polypropylene layer with a polymeric vinylidene chloride layer, comprising the steps of: providing a washing machine having a basket that is perforated so as to pass water and said polymeric vinylidene chloride therethrough after said layered plastic material has been processed while retaining said polypropylene inside said basket; wetting said layered plastic material by rotating said basket so as to agitate said layered plastic material in water and sand; washing said layered plastic material by rotating said basket so as to agitate said layered plastic material in a wash liquor comprising hot water between 170-200 degrees Fahrenheit, caustic, sand, and a surfactant, said wash liquor having a pH of 12 or greater, to strip said polymeric vinylidene chloride layer away from said polypropylene material; and draining said wash liquor and said stripped vinylidene chloride material through said basket while retaining said polypropylene material in said basket.