Patent US3891501A successfully refreshed from Google Patents.
US3891501A
Expired / Lapsed
US
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Multilayer paper making machine
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1973-02-23
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Granted: 1975-06-24
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Expires: 1993-02-23
Abstract
Abstract A combination-paper making machine comprising a Fourdrinier wire on which is formed the first layer of a multi-layer paper sheet, a looped conveying felt placed adjacent to the wire; an inverform unit comprising a second layer-making unit for forming a second layer on the first layer, and is placed over the one end of said Fourdrinier wire and the opposite end of the looped conveying felt, and preferably successive inverform layer making units for forming in turn a third and other successive layers, each of said inverform units having at the bottom part thereof a dehydration mechanism whereby the texture of said multilayer paper is formed.
Inventors
- 👤 Teruhiko Oka
- 👤 Masamichi Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:57
CPC Classifications
D; D21; D21F; D21F11/00; D21F11/02; D21F11/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
Combination paper making machine which comprises a Fourdrinier wire comprising an endless foraminous belt defining a paper forming path, headbox means for supplying a first paper forming slurry to one end of said Fourdrinier wire, a looped conveying felt having one end adjacent the Fourdrinier wire and the other end away from said Fourdrinier wire, at least one inverform paper layer making endless wire means extending over and between said Fourdrinier wire and said looped conveying felt, and second headbox means adjacent to said Fourdrinier wire and before said inverform paper layer making means for supplying a second paper forming slurry on top of said first paper forming slurry on said Fourdrinier wire.
Claim 2
Dependent Claim
113 words
Combination paper making machine which comprises a Fourdrinier wire comprising an endless foraminous belt defining a paper forming path, headbox means for supplying a first paper forming slurry to one end of said Fourdrinier wire, a looped conveying felt having one end adjacent the Fourdrinier wire and the other end away from said Fourdrinier wire, at least one inverform paper layer making endless wire means extending over and between said Fourdrinier wire and said looped conveying felt, and second headbox means adjacent to said Fourdrinier wire and before said inverform paper layer making means for supplying a second paper forming slurry on top of said first paper forming slurry on said Fourdrinier wire.
Claim 3
Dependent Claim
49 words
Combination paper making machine according to claim 1, wherein at least one additional inverform paper layer making endless wire means is positioned over and upon said looped conveying felt and adjacnet the inverform paper layer making means extending over and between the Fourdrinier wire and thE looped conveying felt.
Claim 4
Dependent Claim
30 words
Combination paper making machine according to claim 2, wherein said additional inverform means includes means for dehydration of said paper, whereby a multilayer paper of the desired texture is produced.
Claim 5
Dependent Claim
27 words
Combination paper making machine according to claim 2, including a low nip pressure press adjacent the end of said looped conveying felt away from said Fourdrinier wire.
Claim 6
Dependent Claim
29 words
Combination paper making machine according to claim 1, wherein said inverform means includes means for dehydration of said paper, whereby a multilayer paper of the desired texture is produced.
Claim 7
Dependent Claim
27 words
Combination paper making machine according to claim 1, including a low nip pressure press adjacent the end of said looped conveying felt away from said Fourdrinier wire.
References Cited (Backward Citations)
US3681193A
Cited
US3671389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |