Method for producing multicomponent extrusions having controlled

Details Method for producing multicomponent extrusions having controlled Method for producing multicomponent extrusions having controlled

1991-02-12

1992-07-07

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 404, 264 407, 2641771, 26421123, 364473, 425141, B29C 4706, B29C 4792

Patent

active

051280779

ABSTRACT:
A method of producing a multicomponent extrudate in which the operating line automatically and accurately extrudes the extrudate materials necessary to obtain the desired contribution of materials and specified dimensions of the multicomponent extrudate profile. The screw speed of each extruder can be adjusted to the desired speed by determining the actual thickness and width dimensions of the multicomponent extrudate. The actual measurements are then fed to a computer which calculates the corresponding values of the ratios of the extruder screw speeds to line speed. using the specified dimensions desired in the extrudate, the corresponding values for the screw and line speeds are also calculated. A comparison of the speeds based on measured dimensions, with the speeds based on specified dimensions, provides a measurement by which the screw speeds may then be adjusted such that the measurements of the extrudate profile are brought closer to the specified dimensions of the multicomponent extrudate profile.

REFERENCES:
patent: 3150213 (1964-09-01), Doering
patent: 4087499 (1978-05-01), Bayonnet
patent: 4425289 (1984-01-01), Lee et al.
patent: 4428896 (1984-01-01), Stevenson
patent: 4514812 (1985-04-01), Miller et al.
patent: 4515738 (1985-05-01), Anders
patent: 4592881 (1986-06-01), Kyriakis
patent: 4680152 (1987-07-01), Capelle
patent: 4754413 (1988-06-01), Koster et al.
patent: 4844846 (1989-07-01), Peterson, Jr. et al.
Analysis of extrudate dimensions: die design, swell, and drawdown, by James F. Stevenson (Jan. 4, 1985).

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