Process for producing a selectively reinforced thermoformed article
US5283028A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1992 |
| Grant date | Feb 1, 1994 |
| Priority date | — |
| Expiry date | Jun 30, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2495
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Reinforced twin-sheet thermoformed articles are produced by heating first and second sheets of thermoplastic material; forming the sheets in molds; heating a reinforcing insert of thermoplastic material; placing the heated insert on the first sheet in its mold at the location to be reinforced; pressing the second sheet into contact with the heated first sheet and the heated insert to form the insert between the sheets so that a fusion of the thermoplastic sheets and the insert takes place to produce a reinforced section of the article having a desired shape and thickness. Alternatively, a heated quantity of thermoplastic liquid material may be extruded or injected between the first and second sheets within the first and second molds either by inserting the liquid material before the molds are closed or by injecting it through one of the molds. The articles formed are twin-sheet thermoformed articles with reinforced sections which are thicker than the combined thicknesses of the two thermoformed sheets at a particular location. The articles may advantageously be reinforced with plastic identical to the plastic of the two sheets. The articles are also easily recycled as they are enti…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.