Plastic pipe and manufacturing method therefor
US6889719B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2002 |
| Grant date | May 10, 2005 |
| Priority date | — |
| Expiry date | May 28, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/337
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A plastic pipe 10 is a pipe utilized in a cooling water systems, and the bonding strength of each layer is heightened, and resistance capabilities of the antifreeze solution are enhanced. The plastic pipe 10 comprises an inner layer 22 formed from either a polyphenylene sulfide or an aromatic polysulfide, which is a denatured substance thereof, an intermediate layer 24, which is a mixture of PPS resin and a polyamide resin, and an outer layer 26 including a polyamide resin. The inner layer 22 is formed such that permeation of an antifreeze, which has mainly ethylene glycol, is less than 3.0 g/m2 per day. The resistance capabilities of the antifreeze solution can be achieved by making the thickness of the inner layer 22 0.2 mm or greater.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.