Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Patent
1977-10-05
1979-12-04
Hoag, W. E.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
294034, 210 71, 210415, 241 23, 264 37, 264141, 264142, 264176R, 264 401, 264 407, B29B 103, B29C 2900, B29F 306
Patent
active
041772342
ABSTRACT:
A method for cleaning thermoplastic material especially for reclaiming thermoplastic material from scrap material which includes in addition to the thermoplastic material, materials having a higher melting point than the thermoplastic, such as metal, thermosetting material, etc. The scrap material which has been treated to remove large particles of metal and/or other hard materials is heated and extruded to thereby provide a confined pressurized stream of melted thermoplastic material containing therein small metallic or other unmelted particles. A portion of the stream of melted material is filtered to provide a filtrate composed of melted thermoplastic material containing therein unmelted materials having a size less than a preselected size. The separated unmelted material remains in the stream and the flow rate of this remainder portion of the stream is controlled or metered so as to maintain the stream under pressure where it is being filtered whereby most of the melted thermoplastic material is caused to flow in the filtrate while the remainder portion carries away the separated unmelted material. The apparatus may be retrofitted on a conventional extruder by adding an extruder screw extension and a cylindrical screening means about the screw extension which will wipe the interior surface of the screen of contanimants. The metering of contaminant bearing stream is preferably by chilling the stream to a semi-solid state and grinding the semi-solid state stream. The preferred screen is formed of a punched plate formed into a cylinder and plated with an abrasion resistant material which covers the sharp edges of the holes with a rounded surface.
REFERENCES:
patent: 989975 (1911-04-01), Holt
patent: 3093579 (1963-06-01), Schmidt
patent: 3126818 (1964-03-01), Koelsch
patent: 3342638 (1967-09-01), Wanzenberg
patent: 3687288 (1972-08-01), Lynch et al.
patent: 3695173 (1972-10-01), Cox
patent: 3861287 (1975-01-01), Manser
patent: 4077754 (1978-03-01), Borcher et al.
Hoag W. E.
Metals & Plastics, Inc.
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