Apparatus and method for sheet folding and sealing
US5048809A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1989 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Apr 26, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D15/08
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An apparatus and method for sheet folding and sealing to produce mailable letter-like objects, each from a single preprinted sheet, comprises a feed mechanism for the feed of sheets in seriatim while continuous beads of adhesive are applied to each sheet along lateral portions thereof. The sheets are fed into a buckle folder which makes one or more transverse folds in each sheet while transversely-spaced spots of adhesive are applied along a transverse line across the sheet. The buckle folder is structured so that it has fold pans on one side; and, both the input and output are on the other side. The folder also includes folding and sealing rolls that seal folded-over sheet portions to close and seal the sheet into a letter-like object. A perforator perforates the object so that tearing along the perforations facilitates opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.