Screens and method of making the same

DETAILED DESCRIPTION OF THE INVENTION In FIG.
1 of the drawing there is shown an enlargement of a small piece (not separately numbered) of a woven fabric 10 mesh which is useful as a filter media.
This fabric is composed of strands 12 and other spaced parallel strands 14 of the same or a different material.
As will be apparent in FIG.
1 these strands 12 and 14 are woven together in accordance with conventional practice so that they overlie one another so as to define more or less square shaped opening 16 extending through the fabric 10 where they cross.
Although it is not considered necessary to normally utilize such terminology from the textile industry in connection with this invention, if desired the strands 12 and 14 may be referred to as "warp" and "woof" strands.
The illustration of a woven fabric 10 is not to be taken as a limitation indicating the present invention in only useful with woven fabric.
The present invention is also useful in connection with knitted fabrics (not shown) in which the individual strands of material (not shown) overlie one another where loops and "knots" are employed so as to hold the strands together into the fabric.
Such knitted structures have openings between the strands roughly corresponding to the opening 16 described in the preceding but which differ from these openings 16 as to their configuration.
In accordance with this invention the material in various strands 12 or 14 in the fabric 10 (or other fabric used with the invention) should be a polymer material such as is commonly employed in the textile industry.
These strands 12 or 14 may be either so-called monofilaments or may be twisted threads of the same or different polymers.
If desired, reinforcing strands such as wire cores separated by polymer material may be used with the strands 12 or 14.
Preferably they will have been stretched so that the polymer material within then is oriented so as to develop desirable strength characteristics prior to their being used in the fabric 10.
Suitable results can be achieved if the strands 12 and 14 are of a conventional commercial polyester such as is used at present in filter cloths and in many other types of fabric