Plastics closure unit and a method for the manufacture thereof
US5863655A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1995 |
| Grant date | Jan 26, 1999 |
| Priority date | — |
| Expiry date | Jun 15, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31909
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The closure unit consists of an outlet part (10) and a closure part (20) which is joined to the outlet part even in the open condition, wherein both parts are sealed to each other by a pair of sealing faces in the closed condition of the closure unit. The closure unit has a region made of outlet material (A) and a region made of closure material (B), which two regions are joined together by a flow seam. The flow seam extends in such a way through the closure unit that at least parts of the sealing face on the side of the outlet are made of outlet material and that at least parts of the sealing face on the side of the closure are made of closure material. The closure unit is manufactured by way of a simultaneous casting method. The pairing of materials and the casting parameters of the two simultaneous casting processes are such that the two materials meet at the position provided for the flow seam and form a flow seam (31). The position and shape of the flow seam can also be defined by movable hollow mould parts (pushing devices).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.