Vibratory molding process and product
US7074359B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2003 |
| Grant date | Jul 11, 2006 |
| Priority date | — |
| Expiry date | May 6, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7276
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A fastener strip is disclosed having permanently sealed, airtight portion and a reclosable portion capable of maintaining an airtight seal when closed. The permanently sealed portion is generally planar and essentially impervious to air flow. The reclosable portion includes a ridge and a trough, joined at their adjacent ends to a plug, which prevents air from leaking from the adjacent end of the reclosable portion. Additionally, a dam joins the plug to the first backing in an essentially airtight seal, and joins the plug to the second backing in an essentially airtight seal. A method and apparatus for sealing portions of a thermoplastic fastener strip are also disclosed. A method is additionally disclosed for vibrating and molding thermoplastic materials, in which a flow of malleable thermoplastic material is initiated and molded with an effectively dimensioned vibrator that is unitary, with a first matrix for guiding and molding the malleable polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.