Process for the production of panels, webs, and profiles from pl

Details Process for the production of panels, webs, and profiles from pl Process for the production of panels, webs, and profiles from pl

1991-06-17

1992-07-28

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

264291, B29C 5518

Patent

active

051339226

ABSTRACT:
A process for the production of panels, webs, panel-like moldings or profiles from plastics, of high mechanical strength owing to a molecular orientation by compressive roll-stretching within the nip of at least one pair of pressure or compression rolls at roll and material temperatures below the crystallite melting point or the softening point of the plastic and above 303.degree. K. under compressive stretching. The compressive roll-stretching of the panels, webs, panel-like moldings or profiles takes place with the same or approximately the same circumferential speed of the pressure or compression rolls or without friction at pressures of 20 to 250 MPa, at a degree of compressive stretching of over 1.1.

REFERENCES:
patent: 2354243 (1944-07-01), Blake
patent: 2706310 (1955-04-01), Eckler et al.
patent: 3083410 (1963-04-01), McGlamery
patent: 4514351 (1985-04-01), Kaeufer et al.
patent: 4587163 (1986-05-01), Zachariades
Principles of Polymer Processing, Tadmor et al., John Wiley and Sons, 1979, pp. 36-39 (AU137).
Kirk-Othmer, Concise Encyclopedia of Chemical Technology, John Wiley & Sons, New York (1985) p. 902.
DIN 53445, Torsion vibration test, pp. 172-175.
DIN 53445, Specific heat, pp. 232-233.
Wittfoht, Plastics Technical Dictionary, pp. 204-205, (1956).

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