Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Patent
1990-05-11
1991-06-18
Lorin, Hubert C.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
264168, 2642107, 2642108, 26421115, 26421117, 2642356, 2642896, 264346, 2642905, D01F 696
Patent
active
050247972
ABSTRACT:
Processes for the production of mono- and multifilaments and also staple fibers of multifilaments based on polyarylene sulfides by melt spinning, multistage stretching and setting. As a result of the treatment by blowing of air onto the stabilized spun filaments in the first stretching stages at temperatures .ltoreq.100.degree. C., the chain molecules are oriented; the orientation and crystallinity required for high strengths is achieved by afterstretching at elevated temperature. The residence times in the first stage required for effective stretching can only be varied within relatively narrow limits in order subsequently to achieve the calculated orientations and effects. Overly long residence times at temperatures above 100.degree. C. result in elongation of the material with no additional orientation and hence with an inadequate increase in strength.
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Anderheggen Wolfgang
Dragovic Thomas
Kraemer Michael
Olges Wolfgang
Vogelsgesang Roland
Bayer Aktiengesellschaft
Lorin Hubert C.
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