Welding of plastic parts
US4601927A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1984 |
| Grant date | Jul 22, 1986 |
| Priority date | — |
| Expiry date | May 11, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/8305
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Joints between thermoplastic parts are friction welded (e.g., as by vibration welding) or otherwise thermally welded in such a manner that a non-uniform temperature distribution results during welding which effectively blocks flash flow from the edge of the joint, and upon cooling, produces a joint that is at least partially stress relieved and is resistant to solvent-induced crazing and cracking. Joints may employ nonparallel adjoining surfaces and/or flexural lips, which bend slightly under pressure applied during welding so as to produce a non-uniform pressure distribution and nonparallel welding surface over at least a portion of the resulting weld near the outside edge. In addition, one or more axial grooves may be used to isolate the nonparallel or lipped area of the weld from the remainder of the weld area so as to increase the lip compliance and reduce the effective pressure of molten material acting on the lip during welding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.