US4701368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Papermaker's pressure belt for extended nip presses
Assignee: Ichikawa Woolen Textile Co Ltd
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Filing: 1986-04-14
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Granted: 1987-10-20
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Expires: 2006-04-14
Abstract
Abstract A papermaker's pressure belt for extended nip presses, which comprises a belt base formed of a strong woven fabric having high dimensional stability, a squeezing layer to be in contact with a wet fibrous web on an extended nip press, having a large void volume and formed of a compressible elastic and porous or cellular material, such as fibrous batt, sponge or a foam resin, and formed on one side of the belt base, and an impermeable layer impermeable to oil, formed on the other side of the belt base. The squeezing layer facilitates the separation of the fibrous web from the pressure belt, while the impermeable layer inhibits the permeation of the lubricant applied to the acting surface of the pressure shoe of the extended nip press through the pressure belt.
Inventors
- 👤 Masao Kiuchi
- 👤 Yoshiaki Ito
- 👤 Nobuyuki Ishibashi
- 👤 Kazuo Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:29
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B32B5/00; B32B5/02; B32B5/024; B32B5/22; B32B5/24; B32B5/245; B32B5/26; D; D21; D21F; D21F3/00; D21F3/02; D21F3/0209; D21F3/0218; D21F3/0227; D21F3/0236; B32B2307/00; B32B2307/70; B32B2307/726; B32B2307/7265; B32B2433/00; Y; Y10; Y10S; Y10S162/00; Y10S162/901; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249958; Y10T428/24996; Y10T442/00; Y10T442/30; Y10T442/3325; Y10T442/3366; Y10T442/3707; Y10T442/378; Y10T442/3813
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
56 words
A papermaker's pressure belt for extended nip presses, comprising: a belt base; a squeezing layer formed of a compressible elastic and porous water absorbent material having a large void volume, and formed over the outer side of the belt base; and an impermeable layer impermeable to oil, formed over the inner side of the belt base.
Claim 2
Dependent Claim
56 words
A papermaker's pressure belt for extended nip presses, comprising: a belt base; a squeezing layer formed of a compressible elastic and porous water absorbent material having a large void volume, and formed over the outer side of the belt base; and an impermeable layer impermeable to oil, formed over the inner side of the belt base.
Claim 3
Dependent Claim
35 words
A papermaker's pressure belt for extended nip presses, according to claim 1, wherein said belt base is a woven fabric consisting of yarns having high strength, such as synthetic monofilament yarns or synthetic multifilament yarns.
Claim 4
Dependent Claim
19 words
A papermaker's pressure belt as recited in claim 1, wherein said squeezing layer is formed of a fibrous batt.
Claim 5
Dependent Claim
18 words
A papermaker's pressure belt as recited in claim 1, wherein said squeezing layer comprises a porous sponge material.
Claim 6
Dependent Claim
18 words
A papermaker's pressure belt as recited in claim 4, wherein the sponge material is an opened-cell porous material.
Claim 7
Dependent Claim
19 words
A papermaker's pressure belt as recited in claim 1, wherein said squeezing layer is formed of a foam resin.
Claim 8
Dependent Claim
21 words
A papermaker's pressure belt as recited in claim 1, wherein said impermeable layer comprises a synthetic resin permeating said belt base.
Claim 9
Dependent Claim
87 words
A papermaker's pressure belt for extended nip presses comprising: a belt base, a layer of water absorbent porous material having a large void volume formed over the outer side of said belt base, a layer of impermeable material impermeable to oil comprising a synthetic resin formed over the inner side of said belt base, said synthetic resin permeating said belt base and the inner portion of said porous layer, the remainder of said porous layer not penetrated by said synthetic resin comprising a compressible elastic squeezing layer.
Claim 10
Dependent Claim
87 words
A papermaker's pressure belt for extended nip presses comprising: a belt base, a layer of water absorbent porous material having a large void volume formed over the outer side of said belt base, a layer of impermeable material impermeable to oil comprising a synthetic resin formed over the inner side of said belt base, said synthetic resin permeating said belt base and the inner portion of said porous layer, the remainder of said porous layer not penetrated by said synthetic resin comprising a compressible elastic squeezing layer.
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) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |