Abstract:
An industrial fabric ( 3 ) includes a plurality of yarns ( 31, 32 ) extending in warp and weft directions and woven into a twill weave structure, which includes 200˜2000 monofilament fibers ( 311 ) per inch in either one of the warp and weft directions. A degree of fineness of each monofilament fiber ranges from 50 deniers to 500 deniers. The industrial fabric ( 3 ) not only has good strength but also provides excellent water permeability.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority of Taiwanese Patent Application No. 99129249 filed on Aug. 31, 2010. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The invention relates to an industrial fabric, more particularly, to an industrial fabric for use in construction spots. 
         [0004]    2. Description of the Related Art 
         [0005]    Geotextile clothes are usually used in construction and irrigation fields, especially for repairing constructions after natural disasters, and are very much appreciated in the engineering sector. Since the environment for using the geotextile clothes is usually encountered in tough conditions, such as, in many occasions, soil with very big humidity is involved. As such, it is often required that the geotextile clothes must have characteristics of excellent capability of anti-hydrolysis, good mechanical adaptability for humidity, good water permeability, etc. 
         [0006]    Referring to  FIGS. 1 and 2 , a conventional geotextile cloth  1  includes a plurality of warp yarns  11  and a plurality of weft yarns  12 . During plain weaving the geotextile cloth  1 , each weft yarn  12  crosses the warp yarns  11  by going over one, then under the next and so on. The plain weaving method provides a high strength and firm structure for the geotextile cloth  1 , and is the most commonly used weaving method. 
         [0007]    However, since the geotextile cloth  1  must fulfill the requirement of high strength and good water permeability, the number of monofilaments for each yarn, or the strength or air holes in each yarn is a key factor that determines whether the geotextile cloth  1  is sufficient to permeate water and to block soil and other debris. Due to the restriction of the weaving method implemented by orthogonal weaving of the warp yarns  11  and the weft yarns  12 , the density of the plain weave of the geotextile cloth  1  can be too high to permeate water, or too low to achieve a sufficient strength. 
         [0008]    Referring to  FIGS. 3 and 4 , another conventional geotextile cloth  2  includes a plurality of split film yarns  21  woven along warp and weft directions by plain weaving or twill weaving. Each of the split film yarns  21  is made by splitting a film into a plurality of interconnected monofilaments  211 , which are then subjected to a twisting process. 
         [0009]    However, the split film monofilaments  211  are flat and the strength thereof is lower than that of the monofilaments shown in  FIG. 1 . Compared to the geotextile cloth  1  with the same strength, the split film yarn geotextile cloth  2  is heavier, and requires more material for fabrication and more labor for installation. 
       SUMMARY OF THE INVENTION 
       [0010]    An object of the present invention is to provide an industrial fabric that has good strength and good water permeability. 
         [0011]    Accordingly, the invention provides an industrial fabric which includes a plurality of yarns extending in warp and weft directions and woven into a twill weave structure, which includes 200˜2000 monofilament fibers per inch in either one of the warp and weft directions. A degree of fineness of each of the monofilament fibers ranges from 50 deniers to 500 deniers. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]    Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which: 
           [0013]      FIG. 1  is a plan view of a conventional geotextile cloth; 
           [0014]      FIG. 2  is a side sectional view of the conventional geotextile cloth in  FIG. 1 ; 
           [0015]      FIG. 3  is a plan view of another conventional geotextile cloth; 
           [0016]      FIG. 4  is a side sectional view of the conventional geotextile cloth in  FIG. 3 ; 
           [0017]      FIG. 5  is a plan view illustrating a first example in the first preferred embodiment of an industrial fabric according to the present invention; 
           [0018]      FIG. 6  is a side sectional view of  FIG. 5  along line  6 - 6 ; 
           [0019]      FIG. 7  is a side sectional view of  FIG. 5  along line  7 - 7 ; 
           [0020]      FIG. 8  is a plan view illustrating a second example of the first preferred embodiment; 
           [0021]      FIG. 9  is a side sectional view of  FIG. 8  taken along line  9 - 9 ; 
           [0022]      FIG. 10  is a side sectional view of  FIG. 8  taken along line  10 - 10 ; 
           [0023]      FIG. 11  is a plan view illustrating a third example of the first preferred embodiment; 
           [0024]      FIG. 12  is a side sectional view of  FIG. 11  taken along line  12 - 12 ; 
           [0025]      FIG. 13  is a side sectional view of  FIG. 11  taken along line  13 - 13 ; 
           [0026]      FIG. 14  is a plan view illustrating a fourth example of the first preferred embodiment; 
           [0027]      FIG. 15  is a side sectional view of  FIG. 14  taken along line  15 - 15 ; 
           [0028]      FIG. 16  is a side sectional view of  FIG. 14  a taken long line  16 - 16 ; 
           [0029]      FIG. 17  is a plan view illustrating a fifth example of the first preferred embodiment; 
           [0030]      FIG. 18  is a side sectional view of  FIG. 17  taken along line  18 - 18 ; 
           [0031]      FIG. 19  is a side sectional view of  FIG. 17  taken along line  19 - 19 ; 
           [0032]      FIG. 20  is a plan view illustrating a sixth example of the first preferred embodiment; 
           [0033]      FIG. 21  is a side sectional view of  FIG. 20  along line  21 - 21 ; 
           [0034]      FIG. 22  is a side sectional view of  FIG. 20  along line  22 - 22 ; 
           [0035]      FIG. 23  is a plan view illustrating a seventh example of the first preferred embodiment; 
           [0036]      FIG. 24  is a side sectional view of  FIG. 23  taken along line  24 - 24 ; 
           [0037]      FIG. 25  is a side sectional view of  FIG. 23  taken along line  25 - 25 ; 
           [0038]      FIG. 26  is a plan view illustrating a first example of the second preferred embodiment; 
           [0039]      FIG. 27  is a side sectional view of  FIG. 26  cut along line  27 - 27 ; 
           [0040]      FIG. 28  is a side sectional view of  FIG. 26  cut along line  28 - 28 ; 
           [0041]      FIG. 29  is a perspective view illustrating a second example of the second preferred embodiment; and 
           [0042]      FIG. 30  is a side sectional view of  FIG. 29 . 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0043]    Before the present invention is described in greater detail with reference to the accompanying preferred embodiment, it should be noted herein that like elements are denoted by the same reference numerals throughout the disclosure. 
         [0044]    Referring to  FIGS. 5 to 7 , an industrial fabric  3  according to the preferred embodiment the present invention made from multiple yarns that include a plurality of multifilament yarns  31  and a plurality of monofilament yarns  32 . 
         [0045]    The multifilament yarns  31  and the monofilament yarns  32  in this embodiment are made of polymers, such as polypropylene (PP), polyethylene terephthalate (PET), polythene (PE), etc. Each multifilament yarn  31  is made from a plurality of monofilament fibers  311 , each of which has a degree of fineness ranging from 50 deniers to 500 deniers. Each monofilament yarn  32  has a single monofilament, and has a degree of fineness ranging from 501 deniers to 2000 deniers. 
         [0046]    To weave the industrial fabric  3 , the multifilament yarns  31  and the monofilament yarns  32  are arranged along warp and weft directions by twill weaving. A twill weave structure of the yarns  31 ,  32  may either be a left twill or right twill, and a pattern of one n/1 twill˜n/7 twill, where n ranges from 2 and 7, such as, 2/2, 3/2, 4/2, 5/1, 6/1, 3/7, . . . , etc. Taking the 2/1 twill for example, two warp yarns (multifilament yarn  31  or monofilament yarn  32 ) cross over one weft yarn (multifilament yarn  31  or monofilament yarn  32 ). 
         [0047]    The twill weave structure of the industrial fabric  3  include 200˜2000 monofilament fibers  311  per inch in either one of the warp and weft directions, and/or 5˜60 monofilament yarns  32  per inch in either one of the warp and weft directions. 
         [0048]    There are seven combinations of the monofilament yarns  32  and the multifilament yarns  31 : 
         [0049]    1. Referring once again to  FIGS. 5 to 7 , the industrial fabric  3  is a 2/1 twill weave, and includes the monofilament yarns  32  along the warp direction and the multifilament yarns  31  along the weft direction. 
         [0050]    2. Referring to  FIGS. 8 to 10 , the industrial fabric  3  is a 2/1 twill weave, which includes the monofilament yarns  32  along the warp and weft directions and the multi filament yarns  31  along the weft direction. 
         [0051]    3. Referring to  FIGS. 11 to 13 , the industrial fabric  3  is a 2/1 twill weave, which includes the monofilament yarns  32  along the weft direction and the multifilament yarns  31  along the warp direction. 
         [0052]    4. Referring  FIGS. 14 to 16 , the industrial fabric  3  is a 2/1 twill weave, which includes the monofilament yarns  32  along the warp and weft directions and the multifilament yarns  31  along the warp direction. 
         [0053]    5. Referring to  FIGS. 17 to 19 , the industrial fabric  3  is a 2/1 twill weave, which includes the monofilament yarns  32  along the weft direction and the multifilament yarns  31  along the warp and weft directions. 
         [0054]    6. As shown again in  FIGS. 20 to 22 , the industrial fabric  3  is a 2/1 twill weave, which includes the monofilament yarns  32  along the warp direction and the multifilament yarns  31  along the warp and weft directions. 
         [0055]    7. Referring to  FIGS. 23 to 25 , the industrial fabric  3  is a 2/1 twill weave, which includes the monofilament yarns  32  along the warp and weft directions and the multifilament yarns  31  along the warp and weft directions. 
         [0056]    Due to the twill weaving used to fabricate the industrial fabric  3 , and due to the use of a large amount of the monofilament yarns  32  and/or multifilament yarns  31  and the use of the multifilament yarns  31  including a large number of monofilament fibers  311  to compensate the insufficient strength resulting from the twill weaving, the face side strength of the industrial fabric can reach a strength of 50 kN/m, and the water permeability thereof can amount to 900 litres/m 2 . In comparison with a conventional 25 kN industrial fabric with a water permeability of 111 litres/m 2 , or a conventional 45 kN industrial fabric with 270 litres/m 2 , the industrial fabric  3  can increase the water permeability up to 330% -800%. 
         [0057]    Referring to  FIGS. 26 to 28 , the second preferred embodiment is generally identical to the first preferred embodiment, but differs in that the industrial fabric  3  (2/1 twill) includes a plurality of the multifilament yarns  31  along the warp and weft directions. Each of the multifilament yarns  31  includes a plurality of monofilament fibers  311 . Each monofilament fiber  311  has a degree of fineness ranging between 50 deniers and 500 deniers. The industrial fabric  3  includes 200˜2000 monofilament fibers  311  per inch in either one of the warp and weft directions. 
         [0058]    Referring to  FIGS. 29 and 30 , the industrial fabric  3  according to a third preferred embodiment is a 3/1 twill weave which includes a plurality of the multifilament yarns  31  along the warp and weft directions. 
         [0059]    While the present invention has been described in connection with what is considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.