Heated injection nozzle
US4268241A · kind A · utility
47Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1979 |
| Grant date | May 19, 1981 |
| Priority date | — |
| Expiry date | Jul 12, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/2769
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A nozzle for the injection of liquefied plastic material into the gate of a mold cavity has a tubular metallic body forming a sprue, the outer surface of this body being in contact with an annular heater in the shape of a closed shell whose interior is filled with a matrix of compacted MgO powder having one or more resistance wires embedded therein. The heater is held in position by a nut, threaded onto a gate-side extremity of the body, against a shoulder or a tapering surface portion thereof and is separated by an air space from a surrounding supporting structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.