Machine for making double faced corrugated paperboard comprising a plurality of rows of axially spaced staggered pressure rolls
Abstract
Abstract Adhesive is applied to the crests of the corrugations of a corrugated paper sheet, to the opposite side of which a flat paper facing sheet has previously been attached. A second facing sheet then is applied to the adhesive-carrying corrugations to form a double faced corrugated paperboard strip. This strip moves across heating plate means, against which it is pressed by an endless traveling weighting belt that has a slack lower strand engaging the upper surface of the paperboard. Weight is added to the belt by means of pressure rolls that rest on its lower strand with their axes extending transversely thereof. The rolls are held in parallel rows spaced lengthwise of the belt, with several rolls in each row. The rolls in each row are spaced apart axially and are staggered relative to the rolls in the rows beside them so as to press the belt against the paperboard evenly in order to promote uniform bonding of the second facing sheet to the corrugated sheet.
Inventors
- 👤 Helmut Brandenburg
- 👤 Hansludwig Beck
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |