Envelope-making method
US3982473A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1975 |
| Grant date | Sep 28, 1976 |
| Priority date | — |
| Expiry date | Jun 26, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2160/106
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for making envelope blanks from a continuous web of paper such that the cut blanks can move essentially continuously from one or more cutting stations to envelope-gumming and folding stations. The invention is characterized in cutting two or more side-by-side envelope blanks from the web with a minimum of scrap. This is accomplished by cutting adjacent edges of the side-by-side envelope blanks with a common die and along a single cut. Since the sealing flaps of the blanks must face in the same direction in an envelope machine of the type wherein blank cut from a web move essentially continuously through folding and gumming stations, the method of the invention results in side-by-side envelope blanks wherein the side flaps are on the back panel of one blank while they are on the front panel of an adjacent blank or on either alternately.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.