Apparatus for forming a continuous plastic sheet
US4828432A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1986 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Nov 4, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1795
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Apparatus for lining an irrigation canal with a sheet of fiber-reinforced plastic includes structure for depositing a layer of resin and fiber on a web of flexible carrier material, partially curing the resin prior to laying the sheet in the canal, and then laying the sheet in the canal while the resin is flexible enough to conform to the shape of the canal. The final curing of the resin takes place after the sheet is placed in the canal. A predetermined-shape wrinkle is induced in the carrier web before it is laid into the canal to assist in conforming the sheet to the canal shape without causing randomly placed wrinkles so that the sheet is smooth in the canal. The apparatus forms the sheet and is propelled so that it travels along the length of the canal, fabricating a continuous sheet as it travels. In one embodiment the carrier is a flexible but nonelastic material like kraft paper, coated on one side with wax or other film to prevent saturation by the resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.