US4417931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wet compaction of low density air laid webs after binder application
Assignee: TABERT Inc
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Filing: 1981-07-15
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Granted: 1983-11-29
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Expires: 2001-07-15
Abstract
Abstract In the manufacture of low density air laid webs of predominantly ligno-cellulosic material, the method and apparatus for bonding the dry web with binder and compacting the web with a wet, fabric covered surface so as to increase tensile strength and delamination resistance while reducing binder content and cost is described. Wet compaction of the binder laden web enables controlled penetration of the web with a smaller amount of binder than is possible without wet compaction, and also reduces energy consumption in drying due to the use of less binder.
Inventors
- 👤 Shiu Kang L. Li
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:16
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/10; D; D21; D21H; D21H11/00; D21H23/00; D21H23/02; D21H23/22; D21H23/24; D21H23/26; D21H23/28; D21H25/00; D21H27/00; D21H5/00; D21H5/26; D21H5/265; D21H5/2657; D21H5/2671; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1023; Y10T442/00; Y10T442/60; Y10T442/659
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
53 words
The method of manufacturing a low density web of predominantly ligno-cellulosic material comprising the steps of: a. air laying ligno-cellulosic fibers on a fabric to form a web; b. applying a liquid binder to the web; c. compacting the binder-laden web with a wet surface; and d. drying and curing the wet-compacted web.
Claim 2
Independent Claim
53 words
The method of manufacturing a low density web of predominantly ligno-cellulosic material comprising the steps of: a. air laying ligno-cellulosic fibers on a fabric to form a web; b. applying a liquid binder to the web; c. compacting the binder-laden web with a wet surface; and d. drying and curing the wet-compacted web.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the wet surface for compacting the binder-laden web is covered with a fabric.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein the total amount of binder is from 1% to 30% of the total dry weight of the finished web.
Claim 5
Independent Claim
65 words
The method of manufacturing a low density web of predominantly ligno-cellulosic material comprising the steps of: a. air laying ligno-cellulosic fibers on a fabric to form an uncompacted web; b. compacting the web between a pair of compaction rollers; c. applying a liquid binder to the compacted web; d. compacting the binder-laden web with a wet surface; and e. drying and curing the wet-compacted web.
Claim 6
Independent Claim
65 words
The method of manufacturing a low density web of predominantly ligno-cellulosic material comprising the steps of: a. air laying ligno-cellulosic fibers on a fabric to form an uncompacted web; b. compacting the web between a pair of compaction rollers; c. applying a liquid binder to the compacted web; d. compacting the binder-laden web with a wet surface; and e. drying and curing the wet-compacted web.
Claim 7
Dependent Claim
25 words
The method of claim 4 wherein the total amount of binder is from 1% to 30% of the total dry weight of the finished web.
Claim 8
Dependent Claim
19 words
The method of claim 4 wherein the wet surface for compacting the binder-laden web is covered with a fabric.
Claim 9
Independent Claim
75 words
The method of forming a low density web of predominantly ligno-cellulosic material comprising the steps of: a. air laying ligno-cellulosic fibers on a fabric to form an uncompacted web; b. compacting the web between a pair of compacting rollers c. passing the web through a pair of embossing rollers; d. applying a liquid binder to the embossed web; e. compacting the binder-laden web with a wet surface; and f. drying and curing the wet-compacted web.
Claim 10
Independent Claim
75 words
The method of forming a low density web of predominantly ligno-cellulosic material comprising the steps of: a. air laying ligno-cellulosic fibers on a fabric to form an uncompacted web; b. compacting the web between a pair of compacting rollers c. passing the web through a pair of embossing rollers; d. applying a liquid binder to the embossed web; e. compacting the binder-laden web with a wet surface; and f. drying and curing the wet-compacted web.
Claim 11
Dependent Claim
39 words
The method of claim 7 wherein compacting the binder-laden web with a wet surface comprises compacting the binder-laden web between a web-bearing fabric, supported by a smooth roller, and a roller covered by a fabric continuously wetted with water.
Claim 12
Dependent Claim
29 words
The method of claim 7 further comprising the step of moistening the web to approximately 10% moisture content prior to passing the web through a pair of embossing rollers.
Claim 13
Dependent Claim
23 words
The method of claim 7 wherein the total area covered by the embossed pattern does not exceed 40% of the total web area.
Claim 14
Dependent Claim
20 words
The method of claim 7 wherein the roller covered by a fabric is continuously wetted with an aqueous surfactant solution.
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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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |