Multichamber container with expanded interior walls
US5849241A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1996 |
| Grant date | Dec 15, 1998 |
| Priority date | — |
| Expiry date | Dec 20, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2949/0773
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Multichamber tubular containers are made by extrusion or injection stretch blow molding. The containers usually will have two or three chambers and one or more web walls. The web walls are relatively rigid as formed. The web walls must be stretched laterally to increase their flexibility which is needed for the uniform dispensing of product from the tubular chambers. The webs can be stretched mechanically by the rotation of rods, such as stretch rods, or pneumatically by a differential gas pressure in the chambers while the webs are at or near the glass transition temperature and can flow. The web walls for a circular tubular container can be stretched up to about one-half the diameter of the tubular container.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.