Process and apparatus for making a thermoplastic foil

Details Process and apparatus for making a thermoplastic foil Process and apparatus for making a thermoplastic foil

1988-11-25

1990-03-27

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 405, 425141, 425172, B29C 4792

Patent

active

049118684

ABSTRACT:
The process for making a thermoplastic foil involves the use of a wide-outlet or long-slit die which has at least one outlet-gap-defining adjustable die lip, an opposing gap-bounding lip and a group of piezotranslators distributed over the length of the outlet-gap-defining adjustable die lip, each of which is part of a control loop, acts as a positioning member and is associated with an individual section of an outlet-gap-defining adjustable die lip. At least one actual value of the foil thickness of the thermoplastic foil formed is measured with a measuring device and is fed to a controlling processor. Each of the piezotranslators is controlled by a controlling processor with a controlling variable. In the controlling processor a distribution control variable which is generated by a thickness variation or error is generated by a control variable deviating from a setpoint value and the distribution control variable is fed to individual piezotranslators from the controlling processor according to a distribution function which distributes the thickness errors over the length of the adjustable outlet-gap-defining adjustable die lip.

REFERENCES:
patent: 3940221 (1976-02-01), Nissel
patent: 4281980 (1981-08-01), Hoagland et al.
patent: 4464319 (1984-08-01), Halter et al.
patent: 4514348 (1985-04-01), Iguchi et al.
patent: 4592710 (1986-06-01), Reifenhauser et al.
patent: 4594063 (1986-06-01), Reifenhauser et al.
patent: 4721447 (1988-01-01), Erckmann
patent: 4758390 (1988-07-01), Henze

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