US3855057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper formation utilizing a large diameter suction roll
Assignee: Beloit Corp
•
Filing: 1973-08-20
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Granted: 1974-12-17
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Expires: 1993-08-20
Abstract
Abstract This relates to a compact paper making machine wherein the moist web is prepared initially by merging incipent webs formed on a pair of opposed forming wires in a converging forming zone wherein the wires are brought together under controlled conditions for internal pressure control within the zone coupled with rapid water removal; and the moist web thus formed is further rapidly dewatered as it is passed over a large suction roll while sandwiched between the wire runs under sufficient tension to assist in squeezing water out of the web in order to effect rapidly formation of a self-sustaining web in condition for further processing in press and/or dryer sections.
Inventors
- 👤 L Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:40
CPC Classifications
D; D21; D21F; D21F9/00; D21F9/003
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
198 words
An apparatus for forming fibrous webs comprising; first and second continuous looped foraminous forming wires which are arranged to converge and provide an entrance nip for the reception of web-forming stock; an elongated convexly contoured stationary unyielding surface positioned adjacent said entrance nip and in running contact with said second wire; means for supporting said wires within their respective loops and moving said wires into said entrance nip; said forming wires being arranged to travel over said stationary surface downstream of said entrance nip while having stock therebetween; a relatively large diameter suction roll positioned downstream of said stationary surface and in running contact with said first wire, said suction roll having suction gland means substantially commensurate with its upper down-running quadrant; said wires traveling around the top of said suction roll and along a down-running surface substantially commensurate with said upper down-running quadrant while having stock therebetween so as to dewater the same and form a web; and a first guide roll positioned just before the off-running end of said upper down-running quadrant of said suction roll in running contact with said second wire for separating said second wire from the web traveling on said first wire.
Claim 2
Independent Claim
198 words
An apparatus for forming fibrous webs comprising; first and second continuous looped foraminous forming wires which are arranged to converge and provide an entrance nip for the reception of web-forming stock; an elongated convexly contoured stationary unyielding surface positioned adjacent said entrance nip and in running contact with said second wire; means for supporting said wires within their respective loops and moving said wires into said entrance nip; said forming wires being arranged to travel over said stationary surface downstream of said entrance nip while having stock therebetween; a relatively large diameter suction roll positioned downstream of said stationary surface and in running contact with said first wire, said suction roll having suction gland means substantially commensurate with its upper down-running quadrant; said wires traveling around the top of said suction roll and along a down-running surface substantially commensurate with said upper down-running quadrant while having stock therebetween so as to dewater the same and form a web; and a first guide roll positioned just before the off-running end of said upper down-running quadrant of said suction roll in running contact with said second wire for separating said second wire from the web traveling on said first wire.
Claim 3
Dependent Claim
98 words
An apparatus as defined in claim 1 including a second guide roll positioned downstream of said suction roll in running contact with said first wire for separating said first wire with the web thereon from said suction roll just after the off-running end of the upper down-running quadrant of said suction roll and a third guide roll wrapped with a pick-up felt and positioned downstream of said first guide roll, with said pick-up felt in running contact with the web at the on-coming side of said second guide roll for removing the web away from said first wire.
References Cited (Backward Citations)
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US3262841A
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US3326745A
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US3382143A
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US3540981A
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |