US4728530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for mending damaged areas in papermachine fabrics
Assignee: HARTMUT WALDVOGEL SCHUMANN STRASSE 6 7410 REUTLINGEN 1 WEST GERMANY
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Filing: 1987-01-09
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Granted: 1988-03-01
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Expires: 2007-01-09
Abstract
Abstract A method for mending a damaged area in a papermachine fabric includes filling the defective area with a photosensitive resin, irradiating the defective area with ultraviolet light through a first mask having a multiplicity of light impervious dots in order to crosslink the irradiated regions and rinsing away the non-crosslinked regions of the photosensitive resin. The patch produced in this way is firmly bonded to the fabric of the papermachine fabric and also has a permeability sufficient for dehydration of the paper pulp.
Inventors
- 👤 Hartmut Waldvogel
- 👤 Georg Borel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:55
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; B; B29; B29C; B29C35/00; B29C35/02; B29C35/0266; B29C35/08; B29C73/00; B29C73/02; D21F1/0054; D21F1/0063; B29C35/0805; B29C2035/0827; B29C2793/00; B29C2793/0045; B29K; B29K2035/00; B29K2067/00; B29K2067/06; B29L; B29L2031/00; B29L2031/737; Y; Y10; Y10S; Y10S162/00; Y10S162/903
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
A method for mending damaged areas in papermachine fabrics comprising: filling the damaged area with a radiation curable resin; irradiating the damaged area with the exception of a plurality of spaced apart dot-like areas in order to crosslink the resin in the irradiated areas; and rinsing the area filled with resin to remove the noncrosslinked areas of the photosensitive resin.
Claim 2
Independent Claim
60 words
A method for mending damaged areas in papermachine fabrics comprising: filling the damaged area with a radiation curable resin; irradiating the damaged area with the exception of a plurality of spaced apart dot-like areas in order to crosslink the resin in the irradiated areas; and rinsing the area filled with resin to remove the noncrosslinked areas of the photosensitive resin.
Claim 3
Dependent Claim
33 words
The method according to claim 1 wherein the curable resin is photosensitive and further comprising placing mask means having individual light impermeable dots over the damaged area prior to irradiating the damaged area.
Claim 4
Dependent Claim
26 words
The method according to claim 1 wherein said mask means includes a first mask having light impermeable dots with a diameter of 0.8 to 2.5 mm.
Claim 5
Dependent Claim
19 words
The method according to claim 3 wherein the light impermeable dots have a diameter of 1 to 1.5 mm.
Claim 6
Dependent Claim
32 words
The method according to claim 3 wherein said mask means also includes a second mask placed on said first mask and having an opening which is somewhat larger than the damaged area.
Claim 7
Dependent Claim
46 words
The method according to claim 1 wherein the curable resin is a prepolymer curable by an electron beam and further comprising irradiating the resin by an electron beam generator which is guided over the damaged area with the exception of a plurality of spaced dot-like areas.
References Cited (Backward Citations)
US3477477A
Cited
US4528239A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |