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US3833465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single pulping system for multiple pulp stocks used in paperboard machine
Assignee: MILLER BROS CO Ltd
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Filing: 1971-04-27
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Granted: 1974-09-03
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Expires: 1991-04-27
Abstract
Abstract Various pulp stocks which are to be used in the formation of various layers of multilayered paperboard are prepared by sequential passage of each stock through a single pulping system which includes a pulper, a liquid cyclone, a centrisorter, and pulp thickeners, prior to storage in separate storage tanks. Stocks from the different tanks can be withdrawn and blended in multiple blend chests (with appropriate additive chemicals also being added to the blend chests) for passage to separate stock drop chests and formation points on the paperboard machine.
Inventors
- 👤 H Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:40
CPC Classifications
D; D21; D21F; D21F11/00; D21F11/02; D21F11/04; D21B; D21B1/00; D21B1/04; D21B1/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
A process as claimed in claim 1 in which additive chemicals are introduced into the liner pulp stocks during blending of the pulp stocks.
Claim 2
Dependent Claim
95 words
repeating the steps of subparagraph (1) for a plurality of said furnishes thereby providing a plurality of different pulp stocks in a plurality of separate storage tanks; and withdrawing and blending pulp stock from at least two of said storage tanks, passing each blend from said blending of pulp stocks from said storage tanks to a separate blend chest and withdrawing blended stock from each of said blend chests and passing it to separate liner stock drop chests with, where required, mixing of the blended stocks to form each liner stock in said drop chests.
Claim 3
Dependent Claim
27 words
A process as claimed in claim 1 in which three liner stocks are prepared to produce a paperboard having a top liner, filler liner and bottom liner.
Claim 4
Dependent Claim
28 words
A process as claimed in claim 1 in which four liner stocks are prepared to produce a paperboard having a top liner, underliner, filler liner and bottom liner.
Claim 5
Dependent Claim
137 words
Apparatus for use in the production of liner stocks for separate delivery to a paperboard machine for forming a plurality of liners in the paperboard obtained from said machine, said apparatus comprising: a single pulp preparation system comprising a single pulper mechanism, means for cleaning pulp, and a pulp thickener, serially connected to each other; a plurality of storage tanks, each tank connected for separately receiving a pulp stock of different fiber grade from said single pulp preparation system; collecting means for receiving and mixing pulp stocks of different grades from at least two of sAid storage tanks, separate blend chests for receiving mixtures from said collecting means and for blending pulp stocks for forming blended stocks of different fiber grades, and drop chests for receiving blended stocks from said blend chests for forming said liner stocks.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |