Method and apparatus for making envelope assemblies
US4189895A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1977 |
| Grant date | Feb 26, 1980 |
| Priority date | — |
| Expiry date | Dec 16, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2170/20
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An envelope contains a separate enclosure that is formed from the same sheet material. Sheet material having a first portion and a narrower second portion is folded so portions are superimposed one upon the other. At some time, adhesive is applied to the wider regions of the first portion. By severing the sheet material along the edge common to the first and second portions while maintaining their superimposed relationship, they are separated and then subsequently folded so the first portion envelops the second portion, and the envelope is produced as a result of the adhesive. The severing is carried out while the superimposed portions are suitably restrained, e.g., within a buckle plate folder or within a knife-folding unit or between a pair of moving belts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.