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US 6,739,856 B2Granted
Equipment for hot moulding of articles made of thermoplastic material
AssigneeCRS Srl Centro Ricerche e
InventorFranco Cesano
Life of this patent
Estimating the term…
Abstract
A process for the hot moulding of articles (L) made of thermoplastic material includes the steps of: heating at least one plate of thermoplastic material (L) to a plasticizing temperature; compressing the heated plate (L) between two moulding surfaces (14, 16), set opposite one another, of a pair of half-moulds (10, 12); and forming, by injection moulding, at least one component (22) anchored to a surface of the plate (L), while the plate is being compressed between the moulding surfaces (14, 16).
Claims6
Equipment for hot moulding of articles made of thermoplastic material, comprising:
- a first half-mould and a second half-mould which are movable with respect to one another between an open position and a closed position and are provided with respective compression moulding surfaces designed to apply a moulding pressure on at least one plate of thermoplastic material, following upon movement from the open position to the closed position,
- at least one injection-moulding seat in at least one of said half moulds, the injection-moulding seat communicating with the respective moulding surface,
- at least one injection channel provided for injection plastic material inside said injection-moulding seat,
- at least one narrow section between the injection-moulding seat and the respective moulding surface designed to reduce the pressure of the plastic material injected in the injection-moulding seat in contact with said plate.
1 more element
Dependencies are inferred from the claim text.