Helical blow molding preform and method of manufacturing
US7157040B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Oct 29, 2005 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Oct 29, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/253
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A multiple cavity bottle is manufactured by injection molding a preform having a helical septum and blow molding the preform to create a bottle having a helical septum separating the bottle into two cavities. The helical septum is molded with a twist sufficient to accommodate a contact point size for stretch rods used in blow molding. Blow molding is then accomplished by inserting at least two stretch rods from the top end of the preform to the contact points, heating the preform to a softening temperature, extending the stretch rods to stretch the preform and introducing gas pressure into the preform to stretch a blow molding portion into a final bottle shape within a mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.