US4474836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of carpet liners
Assignee: Chemiegesellschaft Gundernhausen mbH
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Filing: 1983-04-05
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Granted: 1984-10-02
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Expires: 2003-04-05
Abstract
Abstract A method and apparatus for producing carpet liners successively applies a pre-coating and a heavy coating material to a carpet band to be treated. The pre-coating material, which contains an activated isocyanate-polyol mixture, is applied to the carpet band at a temperature at which the components of the mixture will not react with each other. A heavy coating thermoplastic material is subsequently applied to the carpet band. The heavy coating is applied at a sufficiently high temperature to cause the components of the pre-coating mixture, which already has been applied to the carpet band, to react with each other and form polyurethane. Accordingly, a pre-coating layer of polyurethane is formed simultaneously with the application of the heavy coating material.
Inventors
- 👤 Klaus Lukoschek
- 👤 Manfred Schweizer
- 👤 Hans C. Trautmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:56
CPC Classifications
D; D06; D06N; D06N7/00; D06N7/0063; D06N7/0071; D06N7/0078; D06N2203/00; D06N2203/02; D06N2203/04; D06N2203/042; D06N2203/06; D06N2203/068; D06N2203/08; D06N2205/00; D06N2205/10; D06N2205/20; D06N2209/00; D06N2209/08; D06N2209/0807; D06N2209/0823; D06N2211/00; D06N2211/06; D06N2211/066; D06N2213/00; D06N2213/06; D06N2213/065
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
155 words
In a process for producing carpet tiles including the steps of successively applying a pre-coating and a heavy coating to the underside of a textile floor covering and thereafter cutting a band of carpet into carpet tiles, the improvement comprising: said pre-coating including an activated mixture of isocyanate-polyol which does not react to form polyurethane at temperatures near room temperature; said heavy coating including a thermoplastic; maintaining said activated mixture of isocyanate-polyol and a pre-coating applicator at a temperature between the dew point of the ambient environment and a temperature at which no reaction of the isocyanate and the polyol occurs; maintaining said heavy coating and a heavy coating applicator at a temperature at which said heavy coating possesses fluid properties and at which the isocyanate-polyol mixture of said pre-coating will react to form polyurethane; and applying said pre-coating and said heavy coating successively on a carpet band traveling on the same transporting drum roller.
Claim 2
Dependent Claim
155 words
In a process for producing carpet tiles including the steps of successively applying a pre-coating and a heavy coating to the underside of a textile floor covering and thereafter cutting a band of carpet into carpet tiles, the improvement comprising: said pre-coating including an activated mixture of isocyanate-polyol which does not react to form polyurethane at temperatures near room temperature; said heavy coating including a thermoplastic; maintaining said activated mixture of isocyanate-polyol and a pre-coating applicator at a temperature between the dew point of the ambient environment and a temperature at which no reaction of the isocyanate and the polyol occurs; maintaining said heavy coating and a heavy coating applicator at a temperature at which said heavy coating possesses fluid properties and at which the isocyanate-polyol mixture of said pre-coating will react to form polyurethane; and applying said pre-coating and said heavy coating successively on a carpet band traveling on the same transporting drum roller.
Claim 3
Dependent Claim
13 words
The process according to claim 1 wherein said pre-coating mixture includes a filler.
Claim 4
Dependent Claim
13 words
The process according to claim 1, wherein said thermoplastic is a hot-melt mixture.
Claim 5
Dependent Claim
16 words
The process according to claim 1 or 3, wherein said heavy coating thermoplastic is atactic polypropylene.
Claim 6
Dependent Claim
26 words
The process according to claims 1, 3 or 4 wherein said heavy coating applicator is maintained in the temperature range of 80° C. to 220° C.
Claim 7
Dependent Claim
23 words
The process according to claim 5, wherein said heavy coating applicator is maintained in the temperature range of 120° C. to 200° C.
Claim 8
Dependent Claim
23 words
The process according to claim 6, wherein said heavy coating applicator is maintained in the temperature range of 150° C. to 180° C.
Claim 9
Dependent Claim
25 words
The process according to claims 1, 3 or 4 wherein said pre-coating applicator is maintained in the temperature range of 0° C. to 100° C.
Claim 10
Dependent Claim
22 words
The process according to claim 8, wherein said pre-coating applicator is maintained in the temperature range of 0° C. to 30° C.
Claim 11
Dependent Claim
22 words
The process according to claim 9, wherein said pre-coating applicator is maintained in the temperature range of 10° C. to 15° C.
Claim 12
Dependent Claim
36 words
The process of claim 1 further including the step of rotating said transporting drum roller during said successive application of said pre-coating and said heavy coating to said carpet band received on said transporting drum roller.
Claim 13
Dependent Claim
55 words
The process of claim 11 wherein said pre-coating applicator and said heavy coating applicator are rollers mounted proximate to said rotatable transporting drum roller, said process including the step of rotating said pre-coating and heavy coating rollers for applying said pre-coating and said heavy coating successively to said carpet band on said transporting drum roller.
Claim 14
Dependent Claim
17 words
The process of claim 12 including the step of selectively adjusting the temperature of said pre-coating roller.
Claim 15
Dependent Claim
18 words
The process of claim 12 including the step of selectively adjusting the temperature of said heavy coating roller.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |