Method of monitoring the bulge temperature when welding plastic materials together
US5948190A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1998 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Jul 9, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/961
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention provides a method of welding together articles made of a thermoplastic plastic material by means of a butt welding process, whereby the two articles to be welded together are held in place in coaxial relationship by means of clamping devices. Then, the two articles are heated up by means of a heating device that can be placed between the two articles to create a molten up welding zone in the region of each of the free ends of the two articles. As soon as the welding zone has reached the proper temperature, the two articles to be welded together are pressed together to create a bulge. Finally, the temperature of that bulge is continuously monitored and the temperature of the material in the interior of the afore mentioned welding zone is calculated according to the formula ##EQU1## until such a temperature is reached at which the articles can be removed from the clamping devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.