Claims
- 1. The method of enhancing the electrical conductivity of a carbon containing film comprising the steps of: supplying a carbon containing film, passing the film over a grounded metal roll, applying a voltage to the film at a plurality of points from electrodes spaced across the surface thereof to create a series of arcs between the electrode and the film to create small crater-like holes only in the surface of the film and moving the film past the electrodes to form a plurality of lines of small crater-like holes in the film.
- 2. The method of claim 1 wherein the electrodes are supplied voltage from a DC power source.
- 3. The method of claim 2 wherein the DC voltage is supplied through a resistance prior to the passage to the electrodes.
- 4. The method of claim 3 wherein the voltage is in the range of 4-10 KV.
- 5. The method of claim 4 wherein the resistance is on the order of 1 megohm.
- 6. A carpet with enhanced anti-static properties comprising: an upper surface with yarns projecting upwardly therefrom and a lower carbon containing film material adhered to the upper surface to provide stability thereto, the bottom of said film material having a series of rows of crater-like holes only in the surface thereof to increase the electrical conductivity of the carpet.
- 7. The carpet of claim 6 wherein said film material is a hot melt.
- 8. The carpet of claim 7 wherein a fiberglass is imbedded in the hot melt film material.
- 9. The carpet of claim 8 wherein the carpet is in the shape of a rectangle or square.
Parent Case Info
This is a continuation-in-part of U.S. patent application Ser. No. 342,006, filed Apr. 24, 1989 now abandoned.
It has been found that in the manufacture of conductive films, such as a hot melt film containing conductive carbon black for use as a carpet backing, at the level of conductivity varies widely depending on the temperature and shear applied to such film during manufacture. If the conductivity of any such film is very high it is still useful for the intended purpose but if the electrical conductivity is very low it is necessary to provide some means to enhance the electrical conductivity before it can be used for its intended purpose.
Therefore, it is an object of this invention to provide a method and apparatus to enhance the electrical conductivity of a film containing conductive carbon black to increase the anti-static property of a carpet to which it is adhered.
US Referenced Citations (10)
Continuation in Parts (1)
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Number |
Date |
Country |
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342006 |
Apr 1989 |
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Patent Grant
4999231
