Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling rate of movement of molding material or its...
Patent
1985-08-22
1987-05-05
Silbaugh, Jan
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling rate of movement of molding material or its...
264 401, 264 405, 264567, 425135, 425150, B29C 4792
Patent
active
046630970
ABSTRACT:
A method and apparatus for controlling induced dynamic instability in an axially moving form supported between two axially spaced supports wherein the form is relatively soft and therefore exposed to development of transverse tensional forces tending to pivot the form about one or both supports. Control is effected by establishing a datum axis, repeatedly sensing the lateral position of the form in at least two mutually inclined transverse directions, deriving signals proportional to the sensed lateral displacement of the form from the datum axis, converting the signals to thrust forces, and applying the thrust forces to restore the form to the desired lateral position. The technique is of particular value in the production of oriented polymeric tubular films.
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patent: 4101612 (1978-07-01), Barker et al.
patent: 4201741 (1980-05-01), Pannenbecker
patent: 4243363 (1981-01-01), Mulcahy
patent: 4325897 (1982-04-01), Zerle et al.
patent: 4355966 (1982-10-01), Sweeney et al.
Cabaniss Jennifer
Imperial Chemical Industries, Plc.
Silbaugh Jan
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