Patent ID: 7700023
Filing Date: 2010-04-20
Classification: B29C,B29K,C08J

Abstract:
1. A method for producing an environment protective thermoplastic resin polymer, comprising using an extruder and a helical rod to be driven to rotate, said extruder having a feeding section, a melting section, a mixing section and a heating-shaping section formed therein, characterized in that: thermoplastic resin is heated and melted within said melting section and then moved in said mixing section, and foamable hollow expansion balls in a preset proportion to said thermoplastic resin are added into said mixing section to be evenly mixed with said melted thermoplastic resin therein, and said hollow expansion balls are slight heated, foamed and inflated in said mixing section, then moved into said heating shaping section to be heated and foamed by comparatively high temperature to be inflated to an preset size, said thermoplastic resin and said hollow expansion balls are shaped into a foamed thermoplastic resin polymer after being cooled; wherein said extruder is provided with a motor at one side thereof for driving a helical rod to rotate, said helical rod lengthwisely installed in an interior of said extruder, said method comprises: step 1: feeding said thermoplastic resin into said extruder through a material intake provided above said feeding section at a front end of said extruder; step 2: pushing said thermoplastic resin by using said helical rod into said melting section through said feeding section, wherein said thermoplastic resin is heated and melted by heating members disposed around said melting section, and gas is exhausted out of an exhaust hole provided above said melting section during said thermoplastic resin is heated and melted; step 3: feeding hollow expansion balls into said extruder through a material feeding hole positioned above a connecting portion of said melting section and said mixing section that is connected with a rear end of said melting section, wherein said thermoplastic resin and said hollow expansion balls are melted and stirred together by said helical rod; step 4: moving said melted thermoplastic resin and said microfoamed hollow expansion balls forward to pass through a filter screen vertically disposed at the rear end of said mixing section and having numerous meshes, wherein flow amount and flow speed of said melted thermoplastic resin and said micro-foamed hollow expansion balls are controlled by the meshes of said filter screen to produce a backward pressure toward said mixing section, said thermoplastic resin and said micro-foamed hollow expansion balls are stirred and mixed evenly for a comparatively long time by said filer screen; and step 5: moving said thermoplastic resin and said hollow expansion balls into said heating-shaping section after finishing said step 4 to pass through said filter screen, wherein said hollow expansion balls are heated, foamed and inflated at a rate under control in said heating-shaping section, said thermoplastic resin and said hollow expansion balls pass through a shaping nozzle connected with a rear end of said heating-shaping section and are shaped into a foamed thermoplastic resin polymer with a preset thickness and shape after being cooled.