Method for regulatiing the individual layer thicknesses of a coextruded multilayer plastic web
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United States of America Patent
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Feb 6, 1996
Grant Date -
N/A
app pub date -
Jul 29, 1994
filing date -
Feb 10, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for regulating the thickness of several individual layers of an extruded multilayered plastic web involves melting at least two currents of molten plastic in different extruders and bringing the individual molten currents together in an adapter wherein the currents are superimposed into a laminated extruded multilayer stream. The extruded multilayer stream is supplied to a die slot. Devices are provided for controlling the flow of individual currents of molten plastic by modifying their sections before the currents are brought together in the adapter. In order to regulate the thickness distribution, the thickness of the individual layers of the multilayered extruded stream, which correspond to the different currents of molten plastics, is determined before the stream leave the die slot; that is, while the currents are still in a plastic state.
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