Patent US3773592A successfully refreshed from Google Patents.
US3773592A
Expired / Lapsed
US
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Method and apparatus for forming composite sheets of reinforced,nonwoven fibrous materials
Assignee: VP Schickedanz AG
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Filing: 1971-08-10
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Granted: 1973-11-20
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Expires: 1991-08-10
Abstract
Abstract A process is disclosed for producing non-woven flat objects which are reinforced by means of a reinforcing inlay, in which the reinforcing inlay is electrostatically charged, then coated with a thermoplastic binder in powder form, the excess powder removed, and the inlay joined with at least one layer of a fiber fleece. The electrostatic charge is preferably produced by frictional contact of the inlay with an electrically nonconductive material, the coating is preferably accomplished by conducting the charged inlay through a fluid bed of said powder, the removal of excess powder is preferably accomplished by blowing air through the coated inlay, and the joining of the inlay with the fiber fleece is preferably accomplished by heat and pressure.
Inventors
- 👤 H Nicolaus
- 👤 H Pietsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:53
CPC Classifications
D; D04; D04H; D04H13/00; D04H5/00; D04H5/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
69 words
Process for the production of non-woven flat objects, which are reinforced by means of a reinforcing inlay, said method comprising the steps of electrostatically charging said reinforcing inlay, applying to said charged reinforcing inlay a thermoplastic binder in powder form, whereby to cause some of said powder to cling to said inlay, removing excess powder, and then joining said inlay with at least one layer of a fiber fleece.
Claim 2
Dependent Claim
69 words
Process for the production of non-woven flat objects, which are reinforced by means of a reinforcing inlay, said method comprising the steps of electrostatically charging said reinforcing inlay, applying to said charged reinforcing inlay a thermoplastic binder in powder form, whereby to cause some of said powder to cling to said inlay, removing excess powder, and then joining said inlay with at least one layer of a fiber fleece.
Claim 3
Dependent Claim
26 words
The process, as defined in claim 1, wherein said reinforcing inlay is selected from the group consisting of a lattice of threads and an expanded foil.
Claim 4
Dependent Claim
26 words
The process, as defined in claim 1, wherein the electrostatic charging of the reinforcing inlay is produced by frictional contact thereof with an electrically non-conductive material.
Claim 5
Dependent Claim
24 words
The process, as defined in claim 1, wherein said powder is applied by conducting the charged inlay through a fluid bed of said powder.
Claim 6
Dependent Claim
27 words
The process, as defined in claim 1, wherein the excess powder is removed by a method selected from the group consisting of air blowing, beating, and vibrating.
Claim 7
Dependent Claim
20 words
The process, as defined in claim 1, wherein said inlay is joined with said fiber fleece by heat and pressure.
Claim 8
Dependent Claim
86 words
Apparatus for the production of non-woven flat objects which are reinforced by means of a reinforcing inlay, said apparatus comprising means for pulling said inlay from a roll of such inlay and moving it in a predetermined path, means arranged in the path of movement of said inlay for applying to said inlay a thermoplastic resin in powder form, whereby some of said powder clings to said inlay, means for removing excess powder from said inlay, and means for joining said inlay with a fiber fleece.
Claim 9
Dependent Claim
86 words
Apparatus for the production of non-woven flat objects which are reinforced by means of a reinforcing inlay, said apparatus comprising means for pulling said inlay from a roll of such inlay and moving it in a predetermined path, means arranged in the path of movement of said inlay for applying to said inlay a thermoplastic resin in powder form, whereby some of said powder clings to said inlay, means for removing excess powder from said inlay, and means for joining said inlay with a fiber fleece.
Claim 10
Dependent Claim
28 words
Apparatus, as defined in claim 7, including means interposed between said pulling means and said applying means, for frictionally engaging said inlay, whereby to electrostatically charge said inlay.
Claim 11
Dependent Claim
15 words
Apparatus, as defined in claim 7, wherein said applying means comprises a fluid bed chamber.
Claim 12
Dependent Claim
25 words
Apparatus, as defined in claim 7, wherein said means for removing excess powder includes an air blower and suction means disposed below said air blower.
Claim 13
Dependent Claim
24 words
Apparatus, as defined in claim 10, including guide Rolls for conducting said inlay under said air blower, and means for vibrating said guide rolls.
Claim 14
Dependent Claim
35 words
Apparatus, as defined in claim 7, wherein said means for joining said inlay with said fiber fleece comprises a heated drum and strip means for pressing said joined inlay and fiber fleece against said drum.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |