Method of forming a headed thermoplastic tube
US6136247A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1998 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Nov 25, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2023/20
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A headed thermoplastic tube is formed solely from a thermoplastic extruded, stretched, sleeve by positioning the sleeve over a forming mandrel so the sleeve has an exposed portion. While rotating the forming mandrel which holds the sleeve, the inner surface of the exposed portion of the sleeve is heated above the glass transition temperature of the thermoplastic material to render the inner surface molten while the outer surface provides support for the exposed portion of the sleeve. The heated exposed portion is then shaped into a conical shape, such as by heating the outer surface, the rotation of the mandrel is stopped and pressure applied to the conical shaped exposed portion to form a headed thermoplastic tube. The headed tubes produced have a body portion, shoulder portion and neck portion, without any seams, all of which are formed from the starting thermoplastic extruded, stretched sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.