US3977937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for making a non-woven sheet by creating an electrostatic field action
Assignee: Individual
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Filing: 1975-01-15
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Granted: 1976-08-31
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Expires: 1995-01-15
Abstract
Abstract A method and apparatus for making a non-woven sheet by providing a slurry of liquid and fibers and forming the slurry into a sheet-like form by flowing said slurry against and between two spaced apart surfaces. An electrostatic field action is provided that acts on the sheet-like form between said two surfaces and causes at least part of the fibers to be arranged into a sheet means adjacent one of the non-conductive surfaces and at least part of the liquid to be arranged adjacent the other surface. The other surface is pervious and the electrostatic field action causes the liquid to be drawn into the pervious surface at a controlled rate. The one surface has needle-like projections projecting at least partially into the sheet-like form to assist the electrostatic field action in forming the sheet means adjacent that one surface.
Inventors
- 👤 James T. Candor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:37
CPC Classifications
D; D21; D21F; D21F9/00; D21F9/003; D21F11/00; D21F11/006; D21F11/008; D21F5/00; D21F5/16
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
117 words
A method of making a non-woven sheet comprising the steps of providing a slurry of liquid and fibers, forming said slurry into sheet-like form by flowing said slurry against and between two spaced apart first and second surfaces, creating an electrostatic field action that acts on said sheet-like form between said two surfaces and causes at least part of said fibers to be arranged into a sheet adjacent said first surface and at least part of said liquid to be arranged adjacent said second surface, and causing needle-like projections of one of said surfaces to project at least partially into said sheet-like form and assist said electrostatic field action in forming said sheet adjacent said first surface.
Claim 2
Independent Claim
117 words
A method of making a non-woven sheet comprising the steps of providing a slurry of liquid and fibers, forming said slurry into sheet-like form by flowing said slurry against and between two spaced apart first and second surfaces, creating an electrostatic field action that acts on said sheet-like form between said two surfaces and causes at least part of said fibers to be arranged into a sheet adjacent said first surface and at least part of said liquid to be arranged adjacent said second surface, and causing needle-like projections of one of said surfaces to project at least partially into said sheet-like form and assist said electrostatic field action in forming said sheet adjacent said first surface.
Claim 3
Dependent Claim
35 words
A method as set forth in claim 1 and including the step of charging said needle-like projections of said one surface with one electrical potential to provide at least part of said electrostatic field action.
Claim 4
Dependent Claim
22 words
A method as set forth in claim 2 and including the step of electrically insulating said needle-like projections from said sheet-like form.
Claim 5
Dependent Claim
27 words
A method as set forth in claim 2 and including the step of also chargingg said one surface with the same potential as said needle-like projections thereof.
Claim 6
Dependent Claim
27 words
A method as set forth in claim 4 and including the step of electrically insulating said one surface and said needle-like projections thereof from said sheet-like form.
Claim 7
Independent Claim
124 words
An apparatus for making a non-woven sheet comprising means for supplying a slurry of liquid and fibers, a pair of spaced apart first and second surfaces, means for flowing said slurry against and between said pair of surfaces to form said slurry into a sheet-like form between said surfaces, and means for creating an electrostatic field to act on said sheet-like form and cause at least part of said fibers thereof to be arranged into a sheet adjacent said first surface and at least part of said liquid to be arranged adjacent said second surface, one of said surfaces having needle-like projections projecting at least partially into said sheet-like form for assisting said electrostatic field action in forming said sheet adjacent said first surface.
Claim 8
Independent Claim
124 words
An apparatus for making a non-woven sheet comprising means for supplying a slurry of liquid and fibers, a pair of spaced apart first and second surfaces, means for flowing said slurry against and between said pair of surfaces to form said slurry into a sheet-like form between said surfaces, and means for creating an electrostatic field to act on said sheet-like form and cause at least part of said fibers thereof to be arranged into a sheet adjacent said first surface and at least part of said liquid to be arranged adjacent said second surface, one of said surfaces having needle-like projections projecting at least partially into said sheet-like form for assisting said electrostatic field action in forming said sheet adjacent said first surface.
Claim 9
Dependent Claim
33 words
Apparatus as set forth in claim 6 and including means for charging said needle-like projections of said one surface with one electrical potential to provide at least part of said electrostatic field action.
Claim 10
Dependent Claim
18 words
Apparatus as set forth in claim 7 wherein said needle-like projections are electrically insulated from said sheet-like form.
Claim 11
Dependent Claim
25 words
Apparatus as set forth in claim 8 and including means for also charging said one surface with the same potential as said needle-like projections thereof.
Claim 12
Dependent Claim
23 words
Apparatus as set forth in claim 9 wherein said one surface and said needle-like projections thereof are electrically insulated from said sheet-like form.
Claim 13
Independent Claim
116 words
A method of making a non-woven sheet comprising the steps of providing a slurry of liquid and fibers, forming said slurry into sheet-like form by flowing said slurry against and between two spaced apart surfaces, creating an electrostatic field action that acts on said sheet-like form between said two surfaces and causes at least part of said fibers to be arranged into a sheet adjacent one of said surfaces and at least part of said liquid to be arranged adjacent the other of said surfaces, and causing needle-like projections of said one surface to project at least partially into said sheet-like form and assist said electrostatic field action in forming said sheet adjacent said one surface.
Claim 14
Independent Claim
116 words
A method of making a non-woven sheet comprising the steps of providing a slurry of liquid and fibers, forming said slurry into sheet-like form by flowing said slurry against and between two spaced apart surfaces, creating an electrostatic field action that acts on said sheet-like form between said two surfaces and causes at least part of said fibers to be arranged into a sheet adjacent one of said surfaces and at least part of said liquid to be arranged adjacent the other of said surfaces, and causing needle-like projections of said one surface to project at least partially into said sheet-like form and assist said electrostatic field action in forming said sheet adjacent said one surface.
Claim 15
Dependent Claim
35 words
A method as set forth in claim 11 and including the step of charging said needle-like projections of said one surface with one electrical potential to provide at least part of said electrostatic field action.
Claim 16
Dependent Claim
22 words
A method as set forth in claim 12 and including the step of electrically insulating said needle-like projections from said sheet-like form.
Claim 17
Dependent Claim
27 words
A method as set forth in claim 12 and including the step of also charging said one surface with the same potential as said needle-like projections thereof.
Claim 18
Dependent Claim
27 words
A method as set forth in claim 14 and including the step of electrically insulating said one surface and said needle-like projections thereof from said sheet-like form.
Claim 19
Independent Claim
123 words
An apparatus for making a non-woven sheet comprising means for applying a slurry of liquid and fibers, a pair of spaced apart surfaces, means for flowing said slurry against and between said pair of surfaces to form said slurry into a sheet-like form between said surfaces, and means for creating an electrostatic field to act on said sheet-like form and cause at least part of said fibers thereof to be arranged into a sheet adjacent one of said surfaces and at least part of said liquid to be arranged adjacent the other of said surfaces, said one surface having needle-like projections projecting at least partially into said sheet-like form for assisting said electrostatic field action in forming said sheet adjacent said one surface.
Claim 20
Independent Claim
123 words
An apparatus for making a non-woven sheet comprising means for applying a slurry of liquid and fibers, a pair of spaced apart surfaces, means for flowing said slurry against and between said pair of surfaces to form said slurry into a sheet-like form between said surfaces, and means for creating an electrostatic field to act on said sheet-like form and cause at least part of said fibers thereof to be arranged into a sheet adjacent one of said surfaces and at least part of said liquid to be arranged adjacent the other of said surfaces, said one surface having needle-like projections projecting at least partially into said sheet-like form for assisting said electrostatic field action in forming said sheet adjacent said one surface.
Claim 21
Dependent Claim
33 words
Apparatus as set forth in claim 16 and including means for charging said needle-like projections of said one surface with one electrical potential to provide at least part of said electrostatic field action.
Claim 22
Dependent Claim
18 words
Apparatus as set forth in claim 17 wherein said needle-like projections are electrically insulated from said sheet-like form.
Claim 23
Dependent Claim
25 words
Apparatus as set forth in claim 17 and including means for also charging said one surface with the same potential as said needle-like projections thereof.
Claim 24
Dependent Claim
23 words
Apparatus as set forth in claim 19 wherein said one surface and said needle-like projection thereof are electrically insulated from said sheet-like form.
References Cited (Backward Citations)
US3399111A
Cited
US3705847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |