Injection-molding apparatus for making objects of two different resins
US4376625A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1981 |
| Grant date | Mar 15, 1983 |
| Priority date | — |
| Expiry date | Jun 29, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An injection-molding apparatus has a nozzle extending along an axis and formed with an axially forwardly opening outlet, an annular port fixed immediately axially behind or upstream of the outlet, and a central axially forwardly opening port axially fixed behind the annular outlet. Respective plastifiers for feeding respective plastified synthetic resins, normally thermoplastics, are connected to the respective ports. An axially displaceable valve body in the nozzle is displaceable from a fully forward position blocking both of the ports, through a partially back position blocking only the central port, to a fully back position clear of both of the ports. Thus in the fully forward position no resin can enter the nozzle, in the partially back position resin can enter the nozzle only from the annular port, and in the fully back position resins can enter the nozzle through both of the ports.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.