Apparatus for forming envelopes
US3989579A · kind A · utility
16Cited by
9References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1975 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | Feb 27, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1773
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for forming envelopes from thermoplastic sheet material including means for feeding said sheets at predetermined intervals along a conveyor means, means for heating the thermoplastic sheet along a narrow transverse zone, means for moving the heated sheet into contact with a curved surface which is of such a configuration that the sheet is folded along the heated zone into an envelope, and means for heat sealing the envelope along the side edges thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.