US4748044A
Expired / Lapsed
US
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Method for the simultaneous, continuous binding and coating of a nonwoven fabric
Assignee: Carl Freudenberg KG
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Filing: 1981-12-15
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Granted: 1988-05-31
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Expires: 2001-12-15
Abstract
Abstract A method is disclosed wherein a nonwoven fabric is synchronously coated with an adhesive composition and impregnated with a radiation cross-linkable binding agent under conditions that render the composition tacky and adherent but not penetrating and that cross-link the agent to at least in part bind the fibers of the fabric.
Inventors
- 👤 Walter Fottinger
- 👤 Sepp Wagner
- 👤 Bohuslav Tecl
- 👤 Werner Enders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:39
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4326; D04H1/435; D04H1/4334; D04H1/58; D04H1/64; D04H1/66; D06; D06M; D06M17/00
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
159 words
A method for the continuous, synchronous binding and coating of a non-woven fabric, respectively with a radiation cross-linkable binding agent and with a thermoplastic adhesive composition, which comprises: applying the agent as a fluid to the fabric lower side and distributing the agent throughout the fabric; applying synchronously with the agent application, the composition as a solid coating on the surface of the fabric upper side, the agent and composition applications being made as overlapping patterns; irradiating the fabric impregnated with agent and coated with composition to cause agent cross-linking, wherein the irradiation source used also produces thermal radiation of an amount sufficient to render the composition tacky and fabric adherent, and heating the composition with the thermal radiation to cause the composition to become tacky and fabric adherent but substantially prevent it from attaining a fluid state on the fabric which would affect substantial penetration of the composition into the fabric, thereby producing the bonded, coated non-woven fabric.
Claim 2
Independent Claim
159 words
A method for the continuous, synchronous binding and coating of a non-woven fabric, respectively with a radiation cross-linkable binding agent and with a thermoplastic adhesive composition, which comprises: applying the agent as a fluid to the fabric lower side and distributing the agent throughout the fabric; applying synchronously with the agent application, the composition as a solid coating on the surface of the fabric upper side, the agent and composition applications being made as overlapping patterns; irradiating the fabric impregnated with agent and coated with composition to cause agent cross-linking, wherein the irradiation source used also produces thermal radiation of an amount sufficient to render the composition tacky and fabric adherent, and heating the composition with the thermal radiation to cause the composition to become tacky and fabric adherent but substantially prevent it from attaining a fluid state on the fabric which would affect substantial penetration of the composition into the fabric, thereby producing the bonded, coated non-woven fabric.
Claim 3
Independent Claim
158 words
A method for the continuous, synchronous binding and coating of a non-woven fabric, respectively with a radiation cross-linkable binding agent and with a thermoplastic adhesive composition, which comprises: applying the agent as a fluid to the fabric lower side and distributing the agent throughout the fabric; applying synchronously with the agent application, the composition as a tacky, substantially non-fluid coating to the surface of the fabric upper side, said composition being heated to a temperature which renders it tacky and fabric adherent but substantially non-fluid before it is applied to the fabric, and the agent and composition applications being made as overlapping patterns; irradiating the agent impregnated, composition coated fabric to produce agent cross-linking; and maintaining the fabric at a temperature which will substantially cool the composition rendering it substantially solid and preventing it from attaining a fluid state on the fabric which would affect its substantial penetration into the fabric, thereby producing the bonded, coated non-woven fabric.
Claim 4
Independent Claim
158 words
A method for the continuous, synchronous binding and coating of a non-woven fabric, respectively with a radiation cross-linkable binding agent and with a thermoplastic adhesive composition, which comprises: applying the agent as a fluid to the fabric lower side and distributing the agent throughout the fabric; applying synchronously with the agent application, the composition as a tacky, substantially non-fluid coating to the surface of the fabric upper side, said composition being heated to a temperature which renders it tacky and fabric adherent but substantially non-fluid before it is applied to the fabric, and the agent and composition applications being made as overlapping patterns; irradiating the agent impregnated, composition coated fabric to produce agent cross-linking; and maintaining the fabric at a temperature which will substantially cool the composition rendering it substantially solid and preventing it from attaining a fluid state on the fabric which would affect its substantial penetration into the fabric, thereby producing the bonded, coated non-woven fabric.
Claim 5
Dependent Claim
22 words
A method according to claim 1 wherein the composition is applied by an aqueous slurry screen method or a powder dot method.
Claim 6
Dependent Claim
16 words
A method according to claim 2 wherein the composition is applied by a hot melt method.
Claim 7
Dependent Claim
32 words
A method according to claim 2 comprising cooling the composition coated, agent impregnated fabric by convection, conduction or radiative means so that melting of the composition on the fabric is substantially prevented.
Claim 8
Dependent Claim
32 words
A method according to claim 5 comprising cooling the agent impregnated, composition coated fabric by a cold air stream or a cold roller cylinder immediately after application of the hot, melted composition.
Claim 9
Dependent Claim
25 words
A method according to claim 6 comprising cooling the fabric a second time by a cold air stream or a cold roller cylinder after irradiating.
Claim 10
Dependent Claim
13 words
A method according to claim 2 wherein U.V. or electron irradiation is used.
Claim 11
Dependent Claim
11 words
A method according to claim 2 wherein U.V. irradiation is used.
Claim 12
Dependent Claim
21 words
A method according to claim 8 using electron irradiation from a source having a power of about 50 to 500 kV.
Claim 13
Dependent Claim
58 words
A method according to claim 1 wherein the composition is applied as a fine particulate paste in water by an aqueous slurry screen method or a dry, fine particulate by a powder dot method and the irradiation energy source produces a thermal irradiation energy portion which is sufficient to cause paste or particulate tackiness and its fabric adherence.
Claim 14
Dependent Claim
17 words
A method according to claim 11 wherein the composition particle size is less than about 0.2 mm.
Claim 15
Dependent Claim
13 words
A method according to claim 2 wherein U.V. or electron irradiation is used.
Claim 16
Dependent Claim
11 words
A method according to claim 2 wherein U.V. irradiation is used.
Claim 17
Dependent Claim
22 words
A method according to claim 14 wherein at least about 50% of the energy produced by the U.V. source is thermal radiation.
Claim 18
Dependent Claim
28 words
A method according to claim 14 wherein the U.V. irradiation is produced by a mercury gas discharge lamp of a power of at least 80 W per cm.
Claim 19
Dependent Claim
29 words
A method according to claim 1 wherein the patterns of bonding agent and composition comprise repeating units, the agent units being at least as large as the composition units.
Claim 20
Dependent Claim
16 words
A method according to claim 17 wherein the agent units are larger than the composition units.
Claim 21
Dependent Claim
14 words
A method according to claim 17 wherein the agent and composition units are coincident.
Claim 22
Dependent Claim
20 words
A method according to claim 17 wherein the agent and composition unit patterns have a regular or irregular surface raster.
Claim 23
Dependent Claim
29 words
A method according to claim 2 wherein the patterns of bonding agent and composition comprise repeating units, the agent units being at least as large as the composition units.
Claim 24
Dependent Claim
16 words
A method according to claim 21 wherein the agent units are larger than the composition units.
Claim 25
Dependent Claim
14 words
A method according to claim 21 wherein the agent and composition units are coincident.
Claim 26
Dependent Claim
20 words
A method according to claim 21 wherein the agent and composition unit patterns have a regular or irregular surface raster.
Claim 27
Dependent Claim
19 words
A method according to claim 1 wherein the composition has a melting range of about 75° to 130° C.
Claim 28
Dependent Claim
19 words
A method according to claim 2 wherein the composition has a melting range of about 75° to 130° C.
Claim 29
Dependent Claim
27 words
A method according to claim 2 wherein the fabric is maintained at a temperature at least about 15° C. lower than the melting temperature of the composition.
Claim 30
Independent Claim
177 words
A method for the continuous, synchronous binding and coating of a non-woven fabric, respectively with an irradiation cross-linkable binding agent and with a thermoplastic adhesive composition, which comprises: applying the agent as a fluid to the lower side of the fabric, said agent being in a fluid state at a temperature of no more than about 60° C. and said agent distributing substantially throughout the fabric; applying simultaneously with the application of the binding agent, the adhesive composition selected from the group consisting of polyolefins, polyurethanes, copolyamides and copolyesters, to the upper side of the fabric, said composition being at a temperature of about 75° C. to about 130° C., being tacky but non-fluid and adhering to the surface of the fabric as a coating but not penetrating therein; the application of composition and agent being made with overlapping patterns; irradiating the fabric coated with composition and impregnated with agent, using ultraviolet light to cause agent cross-linking, and maintaining the temperature of the fabric at no more than about 60° C., thereby producing the bonded, coated fabric.
Claim 31
Independent Claim
177 words
A method for the continuous, synchronous binding and coating of a non-woven fabric, respectively with an irradiation cross-linkable binding agent and with a thermoplastic adhesive composition, which comprises: applying the agent as a fluid to the lower side of the fabric, said agent being in a fluid state at a temperature of no more than about 60° C. and said agent distributing substantially throughout the fabric; applying simultaneously with the application of the binding agent, the adhesive composition selected from the group consisting of polyolefins, polyurethanes, copolyamides and copolyesters, to the upper side of the fabric, said composition being at a temperature of about 75° C. to about 130° C., being tacky but non-fluid and adhering to the surface of the fabric as a coating but not penetrating therein; the application of composition and agent being made with overlapping patterns; irradiating the fabric coated with composition and impregnated with agent, using ultraviolet light to cause agent cross-linking, and maintaining the temperature of the fabric at no more than about 60° C., thereby producing the bonded, coated fabric.
Claim 32
Dependent Claim
17 words
A method according to claim 28 comprising cooling the fabric after application of the hot melt composition.
Claim 33
Dependent Claim
15 words
A method according to claim 29 comprising cooling the fabric a second time after irradiation.
Claim 34
Dependent Claim
15 words
A method according to claim 30 wherein cooling is achieved by a cold air stream.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |