Synthetic resin cured in place rotary embossing counter roller
US4084500A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1977 |
| Grant date | Apr 18, 1978 |
| Priority date | — |
| Expiry date | Jan 12, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249922
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A resurfaceable rotary die counter is prepared by employing a cylindrical counter core having a central, circumferentially extending relieved area filled with readily replaceable synthetic resin material containing pre-tensioned, spirally wound glass fiber roving which renders the resin craze and crack resistance even under extended continuous use. Economical counter production is possible because of preparation of the counter on the press during makeready using the die as a counter forming element. The resin is run in against the die prior to hardening of the same to form a reverse design surface in the counter which exactly mates with the die surfaces. A viscous resin having a minimum viscosity of about 6000 cps. is employed which has the characteristics of remaining on the counter core without substantial flow until ultraviolet cure can be effected. Fiber glass roving spirally wound under tension around the resin backed core during application of successive resin layers thereto provides a ten fold increase in strength over previously available systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.