Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1986-02-05
1988-05-17
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 401, 264 404, 264 406, 264 407, 264 459, 264 467, 264174, 425140, 425148, B29C 4702, B29C 4792, B29C
Patent
active
047449306
ABSTRACT:
An extrusion process is controlled by feeding the material to be extruded from a supply station (5) to an extruder (1) and repeatedly weighing the supply station to calculate the throughput of the extruder. The initial line speed necessary to produce a predetermined weight/meter of extrudate is calculated and the line speed is adjusted accordingly. Subsequently, the throughput and the line speed are increased simultaneously, such that the weight/meter is maintained substantially constant until any one of a plurality of parameters such as line speed, screw speed, motor load current, extrudate temperature, melt pressure, etc reaches a predetermined maximum value. Thereafter either the line speed or extruder throughput is adjusted such as to maintain the weight/meter of the extrudate substantially constant at the desired value.
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Brand et al., Computerize Your Entire Extrusion System, 1972 Feb., Plastics Technology, pp. 37 to 39.
Hughes James H.
Twist Reginald J.
BICC Public Limited Company
Tentoni Leo B.
Thurlow Jeffery
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