Process for making a plastic material
AssigneeDaimlerChrysler AG
InventorsThomas Foelster, Ralph Greiner, Dirk Schaefer
Life of this patent
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Abstract
A process for the preparation of fiber-reinforced plastic molding includes (1) shortening the fibers to a length of less than 30 mm; (2) introducing the fibers and the plastics present in the solid state, separately from one another, into a mixing chamber of a die press, wherein the plastic is in particulate form; (3) thoroughly mixing the plastic and fibers to give a solids mixture; (4) transporting the solids mixture through die orifices of the die press; (5) heating the solids mixture in the zone before or in the orifices of the die; (6) enclosing at least part or partly embedding the fibers by the plastic during or after the heating of the solids mixture; and (7) comminuting the granulated material for subsequent molding.
Claims22
A process for the preparation of a plastic material for molding, comprising:
- shortening a plurality of fibers to a length of less than 30 mm;
- introducing the fibers and a plastic in particulate form, separately from one another, into a mixing chamber of a die press;
- thoroughly mixing the plastic and the fibers to form a solids mixture;
- transporting the solids mixture through a die of the die press having die orifices;
- heating the solids mixture before or during the transporting through the die orifices, wherein the plastic of the solids mixture is at least partly plastified and/or at least partly softened by the heating;
- enclosing or embedding at least part of the fibers in the plastic during or after the heating and before emerging from the die orifices;
- and
- comminuting or granulating the material from the die to form the plastic material for molding.
A process for preparing a fiber-reinforced plastic molding, comprising:
- shortening a plurality of fibers to a length of less than 30 mm;
- introducing the fibers and a plastic in particulate form, separately from one another, into a mixing chamber of a die press;
- thoroughly mixing the plastic and the fibers to form a solids mixture;
- transporting the solids mixture through a die of the die press having die orifices;
- heating the solids mixture before or during the transporting through the die orifices, wherein the plastic of the solids mixture is at least one of partly plastified or partly softened by the heating;
- enclosing or embedding at least part of the fibers in the plastic during or after the heating and before emerging from the die orifices;
- comminuting or granulating the material from the die to form a fiber-reinforced plastic material for molding;
- and
- molding the fiber-reinforced plastic material by injection molding, extrusion, or compression molding.
A process according to claim 19, wherein the fibers are fibers originating from textile processing.
Dependencies are inferred from the claim text.