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US 3,940,464 AGranted
Production of laces and granules of fibre-reinforced thermoplastics
AssigneeImperial Chemical Industries PLC
InventorsJohn Howard Davis, deceased, Richard C. Harwood, executor, Barbara Davis, executrix
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Abstract
A method of producing fibre-reinforced thermoplastic materials in which a plurality of rovings are impregnated with a powdered thermoplastic, the thermoplastic is melted and each impregnated roving is consolidated by passing it through a die which includes the step of contacting all the rovings with a common pool of molten polymer.
Claims6
A method for the simultaneous production of a plurality of laces of fibre-reinforced thermoplastic polymers which comprises:
- a. impregnating each of a plurality of rovings with a powdered thermoplastic polymer by applying an amount of the powder to the roving;
- b. heating each impregnated roving in a separate chamber so as to melt the polymer which it contains;
- c. heating, before or after the heating specified in (b), all the rovings in a common chamber and in contact with a common pool of molten polymer,
- d. passing each roving through its own separate die to consolidate the roving into a lace with the removal of excess polymer into the melt pool, and
- e. controlling the size of the melt pool by detecting the extent of the pool with at least one suitably placed detector and by correspondingly adjusting the amount of powdered thermoplastic polymer applied to the roving in response to changes in the extent of the melt pool whereby a lace of uniform composition is produced.
2 more elements
Dependencies are inferred from the claim text.