Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling rate of movement of molding material or its...
Patent
1988-12-27
1990-02-20
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling rate of movement of molding material or its...
264102, 26421123, 366 75, 366 89, 366 99, 366139, 366323, 425145, 425203, 425812, B29C 4700, B29C 4776, B29C 4792
Patent
active
049024558
ABSTRACT:
A method of degassing thermoplastic plastic melts over a wide range of viscosities in a degassing extruder including a plurality of sequential degassing sections. Each degassing section includes at least one screw section having flights formed thereon. Each section includes a degassing region and a metering section downstream thereof. The height and length with which the flights are filled in the degassing regions in the individual degassing sections is controlled by the comparison of a pressure gradient measured in the metering region of that section with a desired pressure gradient and on the basis of this, the melt is conveyed with substantially the same throughput capacity in each degassing section. As a result of these measures, the degassing is effected in all of the degassing sections with optimally partially filled screw threads and with an optimum filling length of the worm threads, which is independent of the viscosity of the melt. The number of flights, the depth and width of the flights and the pitch of the flights may be identical in all degassing sections thus simplifying the manufacture of the screw.
REFERENCES:
patent: 3391232 (1968-07-01), Jackson
patent: 3704972 (1972-12-01), Kneller et al.
patent: 3799719 (1974-03-01), Bonikowski et al.
patent: 3992500 (1976-11-01), Kruder et al.
patent: 4197268 (1980-04-01), Anders
Hermann Berstorff Maschinenbau GmbH
Tentoni Leo B.
Thurlow Jeffery
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