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US 4,142,805 AGranted
Method for processing polymeric material
AssigneeUSM Corporation
InventorZehev Tadmor
Life of this patent
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AssigneeUSM Corporation
InventorZehev Tadmor
Estimating the term…
Method for processing solid and viscous plastic material or polymeric material and the like in which plastic or polymeric material is fed through an inlet into an enclosed passage of which opposed side walls are moving simultaneously toward an outlet and the material is processed and dragged forward by the moving side walls against a channel block and with progressive build up of pressure along said passage for discharging the processed material through the outlet from the enclosed passage. Rotary apparatus for practicing the method includes one or more annular channels having opposed side walls and carried by a driven rotor member for movement relative to a housing of which an annular surface coaxial with the rotor cooperates with the walls of the channel or channels to form an enclosed annular passage or enclosed annular passages. An inlet for feeding the plastic or polymeric material into each annular passage extends through the housing and an outlet for discharge of material from each passage is disposed circumferentially a major portion of a complete revolution from the inlet. A channel block supported by the housing projects into each channel to hold the plastic or polymeric material for relative movement with respect to the channel side walls and to wipe or scrape the side walls moving past it, and is located between the outlet and the inlet to each annular passage.
In the method of processing of plastic and polymeric materials which are, or become in the course of processing, viscous liquids including the steps of dragging the material by one wall relative to another for processing and discharge, the improvement which comprises introducing said material at a feed point into a channel between opposed walls moving simultaneously toward a discharge point, retaining said material in said channel by a surface, blocking said channel adjacent said discharge point to restrain the main body of said material from movement with said walls to create relative movement between the main body of said material and said walls, dragging forward viscous liquid portions of said material in contact with said walls and collecting said viscous liquid portions as a pool of viscous liquid against said blocking for processing and discharge, and coordinating the rate of discharge of material from said channel with the surface area and the rate of movement of said opposed walls relative to said main body of material and with the properties of said material to develop pressure in said pool and to effect the desired processing.
Dependencies are inferred from the claim text.