Process for manufacturing moulded articles made of plastics, cellulose or wood pulp and provided with cavities
US6447627B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Jan 3, 2000 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Jan 3, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1003
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process forms lightweight molded articles by positioning inserts having gas creating substances at set positions on a matrix layer positioned between mold halves. The matrix layer with inserts is pressed into the mold cavity and sandwiched between molding material. The gas forming substances are activated to produce gas and the mold halves partially opened to allow the gas to form gas cavities at the position of the inserts. The matrix may be a film or net with gas creating substances in attached packets. Alternatively, the matrix may be developed with inserts of gas producing substances encapsulated within molding material by co-extrusion or co-injection nozzles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.