Method for producing closure gaskets
US5686040A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1993 |
| Grant date | Nov 11, 1997 |
| Priority date | — |
| Expiry date | Oct 28, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7096
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and an apparatus for economically manufacturing gasketed closures is described. Gasket material is placed within the closure and subsequently reformed to provide a gasket profile capable of forming an effective seal when the closure is applied to a container. The gasket material may be deposited in the closure as a hot-melt or as a preformed cut-out. The deposited material is subsequently reformed to have a desired profile by inserting a compression punch or a roller into the closure. The invention is adapted for the use of non-PVC containing materials such as certain thermoplastic elastomer materials which are non-flowable in a molten state and which may have a viscosity index of greater than about 40 meter-grams torque at 175.degree. C. The gasket materials may optionally be foamed prior to reforming to create a finished gasket possessing a high density area more resistant to damage when the closure is applied to a container.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.