Method and apparatus for manufacturing laminated tube structure
Abstract
Abstract Three strips of paper are supplied, under constant, low tension, to the fixed mandrel of a helical tube winding apparatus. A strip supply mechanism senses strip tension, and by means of a mechanical feedback arrangement, regulates the tension. The inner, mandrel-engaging strip is provided with a lubricating medium in the form of lycopodium powder supplied to the inner strip in metered fashion. Liquid adhesive is applied to all surfaces of the strip forming the intermediate ply by an adhesive-applying unit including a pair of opposed, rounded doctor surfaces for removing excess adhesive from the faces of the strip and equalizing the thicknesses of the adhesive layers on the faces. The maintenance of uniform, equally thick layers of adhesive on both faces of the strip during its travel to the mandrel from the doctor surfaces in enhanced by having the strip move through a 180 degree twist.
Inventors
- 👤 J Voss
- 👤 C Johnson
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |