Process to make a composite of controllable porosity

Details Process to make a composite of controllable porosity Process to make a composite of controllable porosity

1996-02-22

1998-04-14

Lee, Helen

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

4283088, 428375, 428378, 428392, 428393, 428394, 4285371, 26417717, 2642101, 2642102, 2642106, 264211, 26421113, B32B 326

Patent

active

057389357

ABSTRACT:
The invention described both a process for the preparation of a natural fiber and thermoplastic composite and the resulting products therefrom. The process includes the steps of mixing the natural fiber and the thermoplastic in a blender with a porosity aid to form a mixture; adding the mixture to a heated extruder; compressing the mixture with an extruder screw having a plurality of flight sections, at least one of the flight sections serving as a compression flight section which compresses the mixture by having its flights spaced closer together than other adjacent flight sections, and at least one other vent flight section which allows gaseous reaction products to be removed from the extruder through a vent in the extruder by having its flights spaced farther apart than the compression section, the vent flight section being positioned after the compression flight section; extruding the mixture through an extrusion die as a composite; and shaping the composite in a vacuum calibration device to a desired profile. The process further includes the step of co-extruding a second thermoplastic onto the natural fiber/thermoplastic composite for some applications (e.g., windows and doors).

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