Apparatus for manufacturing bodies of polymeric material having a core of foamed material enclosed by an outer shell
US5368458A · kind A · utility
11Cited by
8References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1994 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Mar 8, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
an apparatus for producing bodies of polymeric material having an outer shell and a core of foamed material is disclosed. The apparatus includes an extruder and accumulation chamber for extruding a tubular element, i.e., a parison, and a second extruder and accumulation chamber for injecting a foamable polymeric material for forming the core of the body inside the parison. The injection occurs inside the walls of a mold, which causes the tubular parison to undergo swelling due to the expansion of the foamable material until the parison conforms to the shape of the mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.