Method of making a dispensing head, and the corresponding head and dispenser
US5183188A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1990 |
| Grant date | Feb 2, 1993 |
| Priority date | — |
| Expiry date | Oct 31, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C70/763
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a method of making a dispensing head comprising a rigid annular dome made of plastics and, above the dome, a dispensing valve or a pump, the valve or pump having an annular fixing shoulder, the circumference of which is made at least externally of plastics, the lower end of the dome carrying an annular flange for fixing over a can body. In the method disclosed the valve or pump is disposed between tools which tightly grip the fixing shoulder and provide play which limits its heating during a molding operation. Annular tools are provided, forming a circular gap with the tools that grip the fixing shoulder, the gap closing over the shoulder and forming the geometry of the dome and its annular fixing flange. Molten plastics are injected into the annular gap through one or more injection orifices, the molded dispensing head cooled and demolded. The invention also relates to the corresponding preassembled heads and dispensers using them. The invention can be utilized in packaging of liquid or cream products in aerosol or pump type dispensers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.