Patent US4565735A successfully refreshed from Google Patents.
US4565735A
Expired / Lapsed
US
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Papermakers' felt
Assignee: Weavexx LLC
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Filing: 1984-10-19
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Granted: 1986-01-21
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Expires: 2004-10-19
Abstract
Abstract A papermaker's felt is formed by needling a compressible batt layer onto one or both sides of a base layer woven fabric. The batt layer is formed from a mixture of at least two types of fibers. A first type is present in much smaller quantities than the remainder and has a melting point at a temperature below the melting point of the remainder. The felt is heated to a temperature between the melting point of the first type of fibers and the remainder, so as to melt the first type such that it bonds the remainder together and to the base fabric. The felt is then formed into an endless belt.
Inventors
- 👤 August Murka, Jr.
- 👤 Michael Marcellus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:21
CPC Classifications
D; D21; D21F; D21F7/00; D21F7/08; D21F7/083; Y; Y10; Y10T; Y10T442/00; Y10T442/50; Y10T442/56
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
105 words
A papermaker's felt for use with a paper-making machine comprising: a base layer of fabric formed into a belt, and a batt layer having a major portion of a discontinuous phase which includes fibers having a relatively high melting point, and a minor portion of a continuous phase which includes fusible material, said continuous phase also defining channels for the drainage of water, said fusible material having a melting point lower than the melting point of the fibers of said discontinuous phase and higher than the highest expected operating temperature of the papermaking machine, said fusible material fused to said fibers and said base layer.
Claim 2
Dependent Claim
105 words
A papermaker's felt for use with a paper-making machine comprising: a base layer of fabric formed into a belt, and a batt layer having a major portion of a discontinuous phase which includes fibers having a relatively high melting point, and a minor portion of a continuous phase which includes fusible material, said continuous phase also defining channels for the drainage of water, said fusible material having a melting point lower than the melting point of the fibers of said discontinuous phase and higher than the highest expected operating temperature of the papermaking machine, said fusible material fused to said fibers and said base layer.
Claim 3
Dependent Claim
15 words
The papermaker's felt of claim 1 wherein said fibers of said discontinuous phase are nylon.
Claim 4
Dependent Claim
12 words
The papermaker's felt of claim 1 wherein said fusible material is polypropylene.
Claim 5
Dependent Claim
12 words
The papermaker's felt of claim 1 wherein said fusible materials is nylon.
Claim 6
Dependent Claim
22 words
The papermaker's felt of claim 1 wherein said fibers of said discontinuous phase comprise approximately 90% by weight of the batt layer.
Claim 7
Dependent Claim
21 words
The papermaker's felt of claim 1 wherein said fabric base layer is impregnated through its entire thickness by said fusible material.
Claim 8
Dependent Claim
22 words
The papermaker's felt of claim 1 wherein said batt layer is joined to said base layer by needling in a needle loom.
Claim 9
Dependent Claim
20 words
The papermaker's felt of claim 1 wherein said batt layer is joined to said base layer by use of adhesives.
Claim 10
Dependent Claim
16 words
The papermaker's felt of claim 1 wherein said fusible material is in the form of fibers.
Claim 11
Independent Claim
169 words
The method of making a papermaker's felt for use with a papermaking machine comprising the steps of forming a base layer from a fabric, forming a batt layer by utilizing a major portion of fibers having a relatively high melting point in combination with a minor portion of fusible material having a relatively low melting point, where said relatively low melting point is greater than the highest expected operating temperature of the papermaking machine, said fusible material being present in an amount sufficient to form a continuous phase, joining said batt layer to said base layer, heating said joined layers to a temperature below the melting point of said fibers and above the melting point of said fusible material, said fusible material fusing to itself, and fusing to said fibers and said base layer, thereby resulting in a batt layer having a fused continuous phase and a discontinuous fiber phase, said fused continuous phase also defining channels for the drainage of water, and forming the felt into a belt.
Claim 12
Independent Claim
169 words
The method of making a papermaker's felt for use with a papermaking machine comprising the steps of forming a base layer from a fabric, forming a batt layer by utilizing a major portion of fibers having a relatively high melting point in combination with a minor portion of fusible material having a relatively low melting point, where said relatively low melting point is greater than the highest expected operating temperature of the papermaking machine, said fusible material being present in an amount sufficient to form a continuous phase, joining said batt layer to said base layer, heating said joined layers to a temperature below the melting point of said fibers and above the melting point of said fusible material, said fusible material fusing to itself, and fusing to said fibers and said base layer, thereby resulting in a batt layer having a fused continuous phase and a discontinuous fiber phase, said fused continuous phase also defining channels for the drainage of water, and forming the felt into a belt.
Claim 13
Dependent Claim
15 words
The method of claim 10 wherein said fusible material is in the form of fibers.
Claim 14
Dependent Claim
25 words
The method of claim 10 wherein said step of joining said batt layer to said base layer is accomplished by needling in a needle loom.
Claim 15
Dependent Claim
23 words
The method of claim 10 wherein said step of joining said batt layer to said base layer is accomplished by use of adhesives.
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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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |