Method for the continuous production of tubular foamed plastic pipe sleeves insulating
US4087501A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1976 |
| Grant date | May 2, 1978 |
| Priority date | — |
| Expiry date | Jan 19, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1376
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for the continuous production of completely or partly foamed thermosetting polymerizable plastic articles, such as pipe insulation shells or sleeves. One or more sets of justaposed mold-carrying endless conveyors are employed wherein one conveyor of each set supports a series of longitudinally contiguous mold halves complementary with a series of longitudinally contiguous mold halves supported by the other conveyor of the set. The conveyors are advanced simultaneously, and during the juxtaposed portion of travel define a laterally closed, longitudinally extended mold cavity which moves or advances. The cavity thus defined comprises a plurality of zones corresponding to tube segments extending longitudinally in side-by-side, substantially planar disposition, with thin hinge-forming channels interconnecting adjacent segment zones. A thermosetable foam-forming resin mix is distributed on to one of the complementary mold halves prior to closing of the mold cavity. The length of travel of the conveyor in closed-mold condition is designed to permit rising and curing of the resin material, at least to a condition such that the foamed article has sufficient physical integrity to b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.