Process for manufacturing molded articles provided with cavities
US6875298B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 2002 |
| Grant date | Apr 5, 2005 |
| Priority date | — |
| Expiry date | Jul 20, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1003
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Process for manufacturing molded articles made of plastics, cellulose, pulp or wood fibers with cavities, in particular composite parts for light weight construction, by means of tool parts, including the following process steps: a) matrix layer is provided at pre-selected locations with inserts containing gas-creating substances or blowing agents and b) these inserts are activated to create gas in tool parts and thus expand the matrix material. Also disclosed are gas-creating insertion elements for use in the process and made of gas-creating blowing substances enclosed in gas-proof sheaths or inserted into the matrix material in order to form locally limited areas. This process allows the production of particularly light and at the same time solid tool parts, in particular composite parts for light-weight construction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.