Electrically driven plunger for transfer molding press
US5971737A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 1996 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Jul 11, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2043/5833
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The injection of synthetic resin into the cavities of a plastic molding press is provided by a plurality of electrically driven plunger mechanisms each of which includes an elongated rotary screw connected to the output of an electric motor. The screw is threaded operatively to an elongated plunger which extends into the fixed mold and is arranged to support a pill or preform for injection into the runner leading to one or more mold cavities. The electric motor of each plunger mechanism is controlled by a computer program which is capable of varying the velocity and pressure delivery of material to the mold, as well as adjusting the temperature of the mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.