Patent US3765971A successfully refreshed from Google Patents.
US3765971A
Expired / Lapsed
US
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Process for the dry production of a fiber web
Assignee: FIBERLOK INCORPORATED A CORP OF
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Filing: 1970-10-20
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Granted: 1973-10-16
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Expires: 1990-10-20
Abstract
Abstract A method and apparatus for producing a fiber web by a dry method which comprises adding at least a portion of a bonding agent to the loose fibers and forming the loose fibers into a web, the bonding agent being uniformly distributed throughout the web.
Inventors
- 👤 H Fleissner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:02
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/645; D04H1/44; D04H1/46; D04H1/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
23 words
The method of claim 1, wherein the bonding agent is mixed with the loose fibers in a powdery, granular, fibrous or liquid form.
Claim 2
Dependent Claim
41 words
The method of claim 1, wherein the loose fibers are cross-plaited on a carrier fabric forming a plurality of cross-plaited surface layer and additional portion of the bonding agent is applied between the individual layers before or during the cross-plaiting step.
Claim 3
Dependent Claim
53 words
The method of claim 1, wherein the web is pre-bonded by utilizing needles and/or hot calenders before being thermally bonded by drawing the heated gaseous processing medium through the web, said web being thermally bonded while being conveyed on the surface of at least one sieve drum means subjected to a suction draft.
Claim 4
Dependent Claim
29 words
The method of claim 4, wherein an additional bonding agent is applied after the pre-bonding step and before the step of drawing the heated gaseous medium through the web.
Claim 5
Independent Claim
118 words
A method for producing a fiber web by a dry method which comprises mixing a powdery, granular, or fibrous bonding agent uniformly with loose fibers, distributing the resulting uniform admixture of fibers and the bonding agent by air pressure to pile up the admixture of the fibers and the bonding agent between a pair of rotating perforated drums, forming the admixture of the fibers and the bonding agent into a fiber web on said perforated drums, and bonding the resulting fiber web by conveying the web on the surface of at least one sieve drum means subjected to a suction draft and by drawing a heated gaseous processing medium uniformly through said web on said sieve drum means.
Claim 6
Dependent Claim
20 words
The method of claim 6, wherein the bonding of the web is effected by drawing hot air through the web.
Claim 7
Independent Claim
131 words
A method for producing carpets by a dry method which comprises mixing a granular, powdery, or fibrous bonding agent uniformly with loose carpet fibers, forming the resulting uniform admixture of the fibers and the bonding agent into an unbonded web layer, rendering the web layer thicker by cross-plaiting the web layer, depositing the thick resulting web layer crossways onto a carrier fabric, mechanically uniting the carrier fabric and the still unbonded fiber web layer, containing said bonding agent uniformly distributed throughout, and thereafter thermally bonding the web by conveying said web and said carrier fabric on the surface of at least one sieve drum means subjected to a suction draft and by drawing a heated gaseous treatment medium through the web and through the carrier fabric on said sieve drum means.
Claim 8
Dependent Claim
22 words
The method of claim 8, wherein the composite is impregnated with an additive to improve its tensile strength prior to thermal bonding.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |