Minimal scrap loss method for making containers
US4778551A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 1986 |
| Grant date | Oct 18, 1988 |
| Priority date | — |
| Expiry date | May 16, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/108
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention encompasses a process for making multilayer containers by conventional roll fed sheet method, with minimal scrap loss, which comprises the steps of preparing a monolayer sheet of a first thermoplastic material by conventional roll fed sheet methods, cutting or punching billets from a second thermoplastic material sheet, heating the monolayer sheet and the billets to a temperature where both the sheet and the billets become tacky, placing the billets at a position on the sheet so that the billets are in a position over forming cavities in a forming mold at the time of forming, while maintaining the billets and sheet at a temperature where the sheet and billets are tacky and weld together, and forming containers from the welded billets and sheet so that the web scrap left after forming is pure monolayer sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.