Patent Grant
7785699
The present invention relates to electrically charged plastic sheets, and more particularly, to a self-adhering material for protecting surfaces from contamination.
In environments in which hazard materials such as organic solvents and radioactive materials are used, workbenches and the like are often covered with an absorbent disposable material to prevent the contamination of the workbench in the event of a spill. Protective materials that consist of an absorbent layer with a plastic backing to prevent liquid from reaching the underlying surface are well known in the art. Such materials are sold in rolls and are cut to the correct size at the laboratory. The material is then secured to the workbench with tape to prevent the material from slipping. After the material has served its purpose, the material is removed by peeling off the tape, and the material is discarded in the appropriate trash container.
This solution to the contamination problem has two problems. First, the time needed to secure the protective material to the workbench is significant and requires the installer to have a large supply of masking tape or the like. Second, if excessive liquid is released on the protective material, the absorbent layer becomes saturated, and the excess liquid can seep off of the sides of the material that are nearest to the saturated portion of the sheet before the operator can contain the spill and replace the protective layer.
Broadly, it is the object of the present invention to provide an improved protective material that can be applied to workbenches and the like.
It is a further object of the present invention to provide a protective material that is self-adhering, and hence, does not require tape or other adhesives.
It is a still further object of the present invention to provide a protective material that is resistant to seepage from the edges.
These and other objects of the present invention will become apparent to those skilled in the art from the following detailed description of the invention and the accompanying drawings.
The present invention is a protective covering constructed from an electrostatically charged sheet having a top and bottom surface and an absorbent layer. The absorbent layer has top and bottom surfaces, the bottom surface of the absorbent layer being bonded to the top surface of the electrostatically charged sheet. The absorbent layer is divided into a plurality of cells for containing liquid spilled on the absorbent layer. The absorbent layer can be constructed from paper, open cell foam, a fibrous mat, or any other absorbent material. In the preferred embodiment of the present invention, the cells are constructed by providing hydrophobic barriers in the absorbent layer. The barriers can be constructed from paraffin, plastic, or any other material that can penetrate the absorbent layer. In one embodiment of the present invention, a hydrophobic layer is bonded to the top surface of the absorbent layer. The hydrophobic layer has a plurality of pores that allow liquid spilled on the hydrophobic layer to penetrate the hydrophobic layer and be absorbed by the absorbent layer.
The present invention may be more easily understood with reference to
The barriers can be constructed from any hydrophobic material that can be introduced into the absorbent material. For example, paraffin can be applied at an elevated temperature to introduce wax barriers. Similarly, varnish or other hydrophobic material can be introduced in an appropriate solvent which is then evaporated.
The electrostatically charged sheet is preferably a plastic such as a polyester, polycarbonate, or polypropylene. Plastic sheets of these materials can be charged by placing the sheets in an electric field, which is typically 10,000 volts/cm. Methods for charging such sheets are well known to the art, and hence, will not be discussed in detail here. The sheets may be heated during the charging process to increase the remnant electric field. In the preferred embodiment of the present invention, a polyester film having a thickness between 0.001 inches and 0.01 inches is passed between rollers and subjected to an electric field and corona discharge to charge the film. This film is then attached to the absorbent layer. However, embodiments in which the film is attached to the absorbent layer before being subjected to the electric field and corona discharge can also be practiced.
The absorbent layer is preferably constructed from paper that has been impregnated with a hydrophobic material such as paraffin. When placed in contact with the plastic sheet, the stripped paper can be attached by applying an adhesive or by heating the two layers while pressing the layers together such that the hydrophobic material melts and acts as an adhesive. The thickness of the paper will depend on the anticipated liquid loading and the absorbency of the paper. Paper compositions such as used in paper towels are suitable for most applications.
The absorbent layer can also be constructed from an open cell foam material or other absorbent material. For example, thin sheets of plastic foam with an open cell structure can be used to provide a high-absorbency material. The plastic foams that can also be charged electrically can also be advantageously utilized. Such foams will retain material electrostatically after the solution in which the material was dissolved has evaporated from the absorbent layer, and thus, prevent the remaining material from being lost as “dust”.
Similarly, the absorbent layer can be constructed from a fibrous mat such as used in air filters. If the fibers are formed from a plastic that can be charged, the mat can also be charged. Such electrostatically charged mats are well known in the air filter arts, and hence, will not be discussed further here.
Refer now to
Various modifications to the present invention will become apparent to those skilled in the art from the foregoing description and accompanying drawings. Accordingly, the present invention is to be limited solely by the scope of the following claims.
| Number | Name | Date | Kind |
|---|---|---|---|
| 3342613 | Schelhorn | Sep 1967 | A |
| 3409199 | Lake | Nov 1968 | A |
| 3709221 | Riely | Jan 1973 | A |
| 3838692 | Levesque | Oct 1974 | A |
| 4312907 | Hiraoka et al. | Jan 1982 | A |
| 4411928 | Baldwin | Oct 1983 | A |
| 4536433 | Sagi et al. | Aug 1985 | A |
| 4591513 | Suzuki et al. | May 1986 | A |
| 4613544 | Burleigh | Sep 1986 | A |
| 4618475 | Wang | Oct 1986 | A |
| 4664971 | Soens | May 1987 | A |
| 4797310 | Barby et al. | Jan 1989 | A |
| 4828542 | Hermann | May 1989 | A |
| 4850991 | Nakanishi et al. | Jul 1989 | A |
| 4992121 | Rubino | Feb 1991 | A |
| 5102711 | Keller et al. | Apr 1992 | A |
| 5112677 | Tani et al. | May 1992 | A |
| 5135787 | Bair | Aug 1992 | A |
| 5486411 | Hassenboehler et al. | Jan 1996 | A |
| 5496627 | Bagrodia et al. | Mar 1996 | A |
| 5609587 | Roe | Mar 1997 | A |
| 5730922 | Babb et al. | Mar 1998 | A |
| 5789076 | Isohata | Aug 1998 | A |
| 5804512 | Lickfield et al. | Sep 1998 | A |
| 5807366 | Milani | Sep 1998 | A |
| 5817584 | Singer et al. | Oct 1998 | A |
| 5830548 | Andersen et al. | Nov 1998 | A |
| 5846604 | Caldwell | Dec 1998 | A |
| 5855999 | McCormack | Jan 1999 | A |
| 5888604 | Evans et al. | Mar 1999 | A |
| 5998308 | Cohen | Dec 1999 | A |
| 6103644 | Sheridan | Aug 2000 | A |
| 6159325 | Graham et al. | Dec 2000 | A |
| 6162961 | Tanner et al. | Dec 2000 | A |
| 6261679 | Chen et al. | Jul 2001 | B1 |
| 6376034 | Brander | Apr 2002 | B1 |
| Number | Date | Country |
|---|---|---|
| WO9812126 | Mar 1998 | WO |
| WO 0122858 | Apr 2001 | WO |
