Container provided with a pressure equalization opening
US7451884B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2005 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | Aug 3, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1352
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for the production of a container (1) comprising an outer container (2), an inner bag (3) disposed therein and a pressure equalisation opening (10) disposed in the outer container (2), and also a container (1) produced according to this process, is described, wherein firstly a pre-moulding, comprising two coaxial tubes, is first produced by co-extrusion with the help of a blow mould and with an outwardly-projecting base seam (5) being formed. The process is to form a pressure equalisation opening (10) in the outer container (2) of the container (1) without endangering the integrity of the container (1), wherein a lower wastage rate and higher productivity are to be achieved. This is attained by a process wherein the base seam (5) is partially cut off and a force which acts in the direction of the seam is introduced into the pre-moulding, which still has a temperature of 40° C. to 70° C., which force breaks open and plastically deforms the base seam (5) so that a pressure equalisation opening (10) is formed in the base area (4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.