US4072557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for shrinking a travelling web of fibrous material
Assignee: JM Voith GmbH
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Filing: 1977-02-28
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Granted: 1978-02-07
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Expires: 1997-02-28
Abstract
Abstract Method and apparatus for shrinking a travelling web of fibrous material by transferring the web of fibrous material on a porous carrier web to a transfer web travelling at a lower velocity than the carrier web, curving the carrier web to a convex curvature toward the transfer web, at the transfer area, and employing a differential pressure to aid in the transfer of the web of fibrous material to the transfer web. Transversal shrinking is also accomplished by deviating the travel direction of the transfer web in the transfer area laterally at an acute angle from the travel direction of the carrier web. The fibrous material may also be transferred to a second transfer web which may also be at a lateral angle to effect transversal shrinking.
Inventors
- 👤 Christian Schiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:16
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/24; D21H5/245; D21H25/00; D21H25/005
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
155 words
Method of shrinking a travelling web of fibrous material which comprises moving said web of fibrous material disposed on a porous carrier web to an area adjacent a moving transfer web for transfer of said web of fibrous material to said transfer web, maintaining the velocity of said moving transfer web lower than the velocity of said moving porous carrier, maintaining said porous carrier in a convex curvature toward the transfer web in the transfer area, and maintaining a pressure differential between the pressure at the underside of said porous carrier and the topside of said web of fibrous material by gas under pressure in the transfer area acting on the web of fibrous material, said gas under pressure emanating from a fixed position on the side of the carrier web opposite the side carrying the web of fibrous material, to aid in the transfer of said web of fibrous material to said transfer web.
Claim 2
Dependent Claim
155 words
Method of shrinking a travelling web of fibrous material which comprises moving said web of fibrous material disposed on a porous carrier web to an area adjacent a moving transfer web for transfer of said web of fibrous material to said transfer web, maintaining the velocity of said moving transfer web lower than the velocity of said moving porous carrier, maintaining said porous carrier in a convex curvature toward the transfer web in the transfer area, and maintaining a pressure differential between the pressure at the underside of said porous carrier and the topside of said web of fibrous material by gas under pressure in the transfer area acting on the web of fibrous material, said gas under pressure emanating from a fixed position on the side of the carrier web opposite the side carrying the web of fibrous material, to aid in the transfer of said web of fibrous material to said transfer web.
Claim 3
Dependent Claim
26 words
Method according to claim 1, wherein the travel direction of the transfer web deviates laterally at an angle from the travel direction of the carrier web.
Claim 4
Dependent Claim
48 words
Method according to claim 2 wherein said web of fibrous material is transferred from said transfer web to a second transfer web and the travel direction of said second transfer web deviates laterally from the travel direction of the transfer web at an angle to the other side.
Claim 5
Dependent Claim
15 words
Method according to claim 3 wherein said angle deviations are about of the same magnitude.
Claim 6
Dependent Claim
165 words
Apparatus for shrinking a travelling web of fibrous material comprising a porous carrier web for conducting a web of fibrous material, a transfer web for receiving said web of fibrous material, means for driving said porous carrier web to a transfer area adjacent said transfer web for transfer of said web of fibrous material, means for driving said transfer web at a velocity lower than the velocity of said porous carrier web, support means for said porous carrier web in said transfer area to effect a convex curvature toward the transfer web of said porous carrier web and a blasting device through which gas under pressure is applied, fixedly positioned on the side of the carrier web opposite the side carrying the web of fibrous material, for maintaining a pressure differential between the pressure at the underside of said porous carrier and the topside of said web of fibrous material to aid in the transfer of said web of fibrous material to said transfer web.
Claim 7
Dependent Claim
165 words
Apparatus for shrinking a travelling web of fibrous material comprising a porous carrier web for conducting a web of fibrous material, a transfer web for receiving said web of fibrous material, means for driving said porous carrier web to a transfer area adjacent said transfer web for transfer of said web of fibrous material, means for driving said transfer web at a velocity lower than the velocity of said porous carrier web, support means for said porous carrier web in said transfer area to effect a convex curvature toward the transfer web of said porous carrier web and a blasting device through which gas under pressure is applied, fixedly positioned on the side of the carrier web opposite the side carrying the web of fibrous material, for maintaining a pressure differential between the pressure at the underside of said porous carrier and the topside of said web of fibrous material to aid in the transfer of said web of fibrous material to said transfer web.
Claim 8
Dependent Claim
28 words
Apparatus according to claim 5 including a suction device in the transfer area on the side of said transfer web which is facing away from said carrier web.
Claim 9
Dependent Claim
33 words
Apparatus according to claim 5 wherein said transfer web in said transfer area is disposed laterally to travel in a direction at an acute angle to the travel direction of said carrier web.
Claim 10
Dependent Claim
57 words
Apparatus according to claim 7 including a second transfer web for transfer of said web of fibrous material from said first transfer web, said second transfer web being disposed laterally to travel in a direction at an angle to the travel direction of said first transfer web and parallel to the travel direction of said carrier web.
Claim 11
Dependent Claim
13 words
Apparatus according to claim 8 wherein means are provided for adjusting said angles.
Claim 12
Dependent Claim
39 words
Apparatus according to claim 8 wherein said transfer area between said first transfer web and said carrier web and the transfer area between said first transfer web and said second transfer web are located vertically one above the other.
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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |