JP3967888B2 - Filter cloth - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filter cloth used in a belt press type dehydrator used for drainage, sludge treatment, public sewage treatment and the like.
[0002]
[Prior art]
Conventionally, a plastic fabric has been adopted as a filter cloth for solid-liquid separation such as drainage, sludge treatment, and sewage treatment because of its excellent lightness and durability. For example, in the case of a filter cloth used in a belt press type dehydrator or the like, a plastic fabric body is woven with warps and wefts made of synthetic fibers, and joint portions are provided at both ends of the end-shaped plastic fabric body, and both end portions thereof Are used as endless. Further, as these joint structures, a metal hook is directly planted to each end portion of the end-shaped plastic fabric, and the planted metal hooks are meshed with each other and formed into a common hole formed by meshing. Remove the weft from the metal hook structure joint through which the joining core wire is inserted and the ends of the plastic fabric body with ends, and fold back the cocoon-like warp exposed by removing the weft. Loop shape, weaving the back end of the warp into the plastic fabric body, meshing the warp loops formed at both ends of the plastic fabric body, and inserting the connecting core wire into the warp loop common hole formed by meshing A warp loop seam structure joint to be connected and a spiral filament made of synthetic resin monofilament are meshed with the warp loop, and meshed. Insert the spiral wire fixing core wire into the common hole, mesh the spiral wires formed on both ends of the plastic fabric body, and connect the connecting core wire into the spiral wire common hole formed by meshing Spiral seam structure joints are commonly used.
[0003]
[Problems to be solved by the invention]
However, in the conventional joint structure, the so-called filter leakage phenomenon, in which the gap in the joint portion is large and the filtrate such as sludge leaks into the filter cloth from the gap, is regarded as a problem in the sludge treatment process. It had been. In order to avoid such a leakage trouble, for example, Japanese Patent Laid-Open No. 8-24312 discloses a method of inserting a plurality of leakage prevention core wires in addition to the bonding core wires into the common hole of the joint portion of the plastic fabric. Has been. Japanese Utility Model Laid-Open No. 5-60511 discloses that the gap portion of the joint portion is covered to prevent leakage. Japanese Laid-Open Patent Publication No. 9-294906 discloses that an insertion material is inserted into the gap of the joint portion and a water curable resin is applied to the joint portion to prevent leakage. In any of these conventional techniques, the gap of the joint portion is large in any case, and it is necessary to perform additional processing on the joint portion such as reducing or covering the gap of the joint portion. Further, when a filter cloth is hung on a belt press type dehydrator or the like, a lot of labor and time are required for the joining work for bringing the both ends of the belt together to form an endless belt. In addition, if the additional processing is performed separately, more labor and time are required including repair and maintenance of the subsequent processing portion, and the operation efficiency of the dehydrator is lowered.
[0004]
In view of the above problems, the present inventor intends to provide a filter cloth that is free from leakage of filtrate at the joint portion, can be easily joined to the joint portion, and does not require additional processing.
[0005]
[Means for Solving the Problems]
The filter cloth of the present invention is a filter cloth made of an endless plastic woven fabric, and is a single synthetic resin having a stretchability preliminarily molded to be mutually locked at both ends of the plastic woven fabric body. A coiled fastener element array made of wire is used as a warp yarn loop that constitutes the plastic fabric body in a state where the coiled fastener element array extends within a range of 1 to 25% of the reference length dimension at the time of molding. Filtration with coil fastener joints that endlessly engage, mesh the coiled fastener element rows at both ends from above and below, and insert the joining core wire into the common hole formed by meshing and joining them endlessly The above-mentioned problem is solved with a cloth.
[0006]
Also, it is preferable element color of the coiled off Asuna over element row is translucent color. The joining core wire is preferably a stranded wire formed by twisting a plurality of monofilaments.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The filter cloth of the present invention will be described in detail below based on the illustrated embodiment.
[0008]
In FIG. 1, the side view of the coil fastener joint part of the filter cloth of this invention is shown. FIG. 2 shows a plan view of a coiled fastener element array during molding. FIG. 3 shows a side view of the coiled fastener element array of FIG. 2 as viewed from the meshing head side. FIG. 4 is a perspective view of a coil fastener joint forming slider that meshes coiled fastener element rows from above and below.
[0009]
As shown in FIG. 1, the filter cloth (1) having the coil fastener joint according to the present invention has a stretchability preliminarily molded to be mutually locked at both ends of the plastic fabric body (2). A coiled fastener element array (3) (hereinafter simply referred to as this element array) made of a synthetic resin wire is stretched within a range of about 1 to 25% with respect to a reference length dimension at the time of molding, and a plastic fabric The warp yarns (4) constituting the main body are entangled with the return loop (5), the element rows at both ends are engaged with each other in the vertical direction, and the joint core wire (6) is formed in the common hole (6) formed by the engagement. 7) is a filter cloth made endless with a coil fastener joint that is inserted and joined endlessly. Like the warp loop seam structure joint and spiral seam structure joint, both ends of the plastic fabric are joined and held with a joining core wire, but this is a coil fastener joint formed by meshing the element rows from above and below. Therefore, a gap in the joint portion is extremely small, and a joint structure that can prevent the above-described leakage phenomenon can be obtained. Because of having such a joint structure, the filter cloth of the present invention can be a filter cloth with less process trouble without the need for an additional process for preventing leakage.
[0010]
Further, the filter cloth of the present invention can be easily meshed between the element rows from above and below by the slider (8) at the time of actual joint joining. Joining and separation can be a joint that is remarkably superior in labor and time.
[0011]
In addition, when the element row is attached to a plastic fabric, an interference fit that has a joining strength as a fastener for holding and holding a general two-sided base fabric is not so important. It is only necessary to secure a common hole through which the joining core wires are inserted after meshing with each other to such an extent that the meshing is not released by a slight external force. That is, in the present invention, in order to maintain a strong interference fit between the element rows as in the prior art, the warp density of the plastic fabric is not adjusted according to the coil density of the element rows, By extending the element row in the axial direction, the coil density of this element row is adjusted according to the warp density of the plastic fabric. By taking such joint forming means, various sludge treatment machines and sewage treatment equipment are used. It can be applied as a filter cloth for a solid-liquid separator such as a machine, and can be a joint that can easily mesh the element rows from above and below.
[0012]
The extension range is preferably about 1 to 25% with respect to the reference length dimension at the time of molding of the element row. Here, the reference length dimension at the time of molding refers to a predetermined reference in the axial direction in a state where no external force is applied to the element array made of a single synthetic resin wire material having a stretchability that has been molded in advance to mutually lock. The length dimension. If the elongation exceeds 25%, not only the joining strength between the element rows becomes too weak, but also the shape maintenance and durability of the element rows themselves become inferior, making them unsuitable as joint members. Further, the gap in the joint portion becomes large, and a leakage phenomenon is likely to occur, which is not preferable. On the contrary, if the elongation rate is less than 1%, the warp density of the plastic woven fabric body is likely to be limited, and at the same time, when the element rows are meshed from above and below, it is difficult to mesh and lock. More preferably, it is preferable to extend within a range of 5 to 20%.
[0013]
For example, as shown in FIG. 5, a coil fastener element array (3) is used by joining a coil fastener element array (3) to the end of a cloth tape (10) having a low rigidity. When locking each other with the joint-forming slider, the meshing heads (3h) of the coiled fastener element rows in a Y-shape from both the left and right directions on the same plane are as if the teeth of the spur gears are It is locked by a joint-engaging slider (11) of a lateral meshing type that meshes as if meshing. However, when the coiled fastener element array is directly attached to a highly rigid plastic fabric without using a cloth-like tape as in the present invention, the coiled fastener is formed in a Y shape from the left and right directions on the same plane. As the mesh heads of the element rows engage with each other as if the spur gears engage with each other, the higher the rigidity of the fabric, the more difficult it is to engage. Therefore, the meshing head is formed from the vertical direction, but when the element rows are meshed from the vertical direction, the mesh head formed by the element row is configured by increasing the axial extension rate of the element rows. The distance between the elements becomes wider, and the meshing head (3h) of one element row can be easily inserted into the meshing space (3d) of the other element row. Accordingly, the elongation ratio is preferably as large as possible in terms of meshing between the element rows. On the other hand, the bonding strength between the element rows until the core wire for bonding is inserted (here, tensile strength at both ends of the plastic fabric). In this respect, the greater the elongation rate, the weaker the joint strength and the larger the gap in the joint. Therefore, it is more preferable that the elongation rate is expanded by 1 to 25% with respect to the reference length dimension at the time of this element row molding. More preferably, it is 5 to 20%.
[0014]
For example, this element row forms a meshing head that bulges in the transverse direction of the monofilament by pressing a portion corresponding to the meshing head molding portion of the monofilament after coil molding of a known synthetic resin monofilament Alternatively, it can be obtained by previously molding the meshing head of the above-mentioned form at predetermined intervals of the synthetic resin monofilament and then coil-molding the monofilament later. This element array is not specially molded, but is molded according to the same standard as the coiled fastener element array used for coil fasteners that are normally used for clothing, bags, etc. Can be used. For example, a polyester monofilament having a wire diameter of 0.6 mm is molded into a coiled fastener element array having a coil density of 21 (number of meshing heads / inch), and a polyester monofilament having a wire diameter of 0.8 mm having a coil density of 16 (number of meshing heads / inch). Preferred are those molded into a coiled fastener element array, polyester monofilaments with a wire diameter of 1.1 mm, molded into a coiled fastener element array with a coil density of 11.5 (number of meshing heads / inch), and the like. In the present invention, taking the coiled fastener element array as an example, for example, for a double woven plastic fabric having a warp density of 70 (lines / inch), a coiled fastener having a coil density of 21 (number of meshing heads / inch) is used. The element row is elongated by about 20%, and a warp loop is formed for every four warp yarns of the plastic fabric. The warp loop and the coiled fastener element row are connected to a coiled fastener element row (3 ) And the fixing core wire (12) are entangled and attached at the same time, the mutual density of the warp loop density and the coil density becomes equal, and a coil fastener joint that does not have any problem in meshing of the element rows is obtained. It is done. Similarly, for a double-woven plastic fabric having a warp density of 60 (lines / inch), a coiled fastener element array having a coil density of 15.8 (number of meshing heads / inch) is elongated by about 5.3%. A warp loop is formed for every four warps, and the warp loop and the coiled fastener element array are entangled and attached, so that the warp loop density and the coil density are equal to each other, and the element arrays are engaged with each other. A coil fastener joint with no problems can be obtained. In this way, in order to match the coil density of this element row with the warp loop density, by extending this element row within the above numerical limit range, it can be used as a joint structure for a wide variety of filter cloths and in the vertical direction. Thus, a joint that can be easily engaged and locked can be obtained.
[0015]
In order to mesh the element rows from above and below, a joint forming slider for meshing in the vertical direction may be used. For example, as shown in FIG. 4, on the front end vertical surface of the slider, one side of the coiled fastener element row at both ends is inserted into one open opening, and the other side is inserted into the other element row. Open insertion ports are formed, and each insertion port has an element row engagement region which is a region shifted in the vertical direction on the vertical surface of the front end and partially overlapped in the horizontal direction. Both end open common outlets having the same region in the vertical direction and the horizontal direction are formed on the end vertical surface, and each coiled fastener element array inserted from the insertion port is provided on the vertical surfaces on the left and right side ends of the slider. A carp provided with a pressure lock for forming a guide guide groove having a continuous horizontally long hole for guiding to a common outlet and for engaging the coiled element rows with each other. Fuasuna joint forming slider is preferred.
[0016]
Moreover, it is preferable that the element color of this element row is a translucent color. This is because the element cores are meshed and locked, and then the core wire for joining is inserted into the common hole, which is the gap between the element strings formed by meshing, but the element color is translucent when inserted. By making the color, it becomes easy to visually check the degree of insertion of the core wire that is not obstructed by the element rows that are originally meshed, and the core wire insertion work can be further facilitated. Translucent monofilaments have been widely used in the past, and can be obtained by forming them into a coiled fastener element array as a raw yarn. The translucent color referred to here indicates a transparent color that is more transparent.
[0017]
Further, in the joining core wire used for the coil fastener joint constituting the filter cloth of the present invention, for joining with various cross-sectional shapes such as circular cross-sectional shape, cross-sectional elliptical shape, cross-sectional polygonal shape, cross-sectional irregular shape, etc. A core wire is applicable, and a plurality of core wires may be inserted, but a twisted wire obtained by twisting a plurality of monofilaments is preferable. For example, a stranded wire obtained by twisting 2 to 20 polyester monofilaments having a wire diameter of 0.1 to 1 mmΦ is applied. By employing such a stranded wire, a core wire along the common hole diameter of the coil fastener joint can be selected, and a core wire that can be easily inserted can be obtained. By doing so, the meshing head (3h) of each coiled fastener element row approaches the corresponding folding loop (5), and as a result, the gap in the coil fastener joint is reduced. In addition, what is necessary is just to manufacture this strand wire by a conventional method, and what is necessary is just to set suitably about the number of twists, a wire diameter, the number of twists.
[0018]
The time and labor required for putting the filter cloth having the coil fastener joint of the present invention into a known belt press-type dehydrator was measured, and in the case of a 4 m wide filter cloth, 5 workers were required. The work was completed in minutes. On the other hand, in the case of the filter cloth having the conventional pin seam joint, four people spent 30 minutes of laying work. Further, in order to estimate the presence or absence of the leakage phenomenon, when the air permeability of the joint portion was measured, the air permeability of the coil fastener joint portion of the present invention was about 23100 ccm (the air permeability of the plastic fabric main body portion was about 24600 ccm). In contrast, the air permeability of the pin seam joint was about 26500 ccm. That is, the filter cloth of the present invention is one in which the air permeability of the joint portion constituting the filter cloth is equal to or lower than the air permeability of the plastic fabric body. It can be a filter cloth that can prevent the leakage phenomenon. In addition, two additional core wires are added to the common space portion of the pin seam joint portion, and the air permeability is 24700 ccm, which is as high as the air permeability of the plastic woven fabric. As a result, it took time and effort, and the effectiveness of the present invention was confirmed.
[0019]
The present invention has been described above based on the illustrated embodiments. However, the present invention is not limited to such embodiments, and various modifications may be made to the specific structure within the scope of the present invention. Needless to say.
[0020]
【The invention's effect】
As described above in detail, according to the present invention, there can be obtained a filter cloth in which there is no leakage of the filtrate in the joint portion and the joint portion can be easily joined.
[Brief description of the drawings]
FIG. 1 is a side view of a coil fastener joint portion of a filter cloth according to the present invention.
FIG. 2 is a plan view of a coiled fastener element array during molding.
is there.
FIG. 3 is a side view of the coiled fastener element row of FIG. 2 as viewed from the meshing head side.
FIG. 4 is a perspective view of a slider that meshes coiled fastener element rows from above and below.
FIG. 5 is a plan view of a general coil fastener.
FIG. 6 is a conceptual diagram of using a filter cloth in a belt press dehydrator.
FIG. 7 shows an enlarged plan view of a joint portion.
A: An enlarged plan view of the joint portion of the spiral seam structure is shown.
B: An enlarged plan view of the coil fastener structure joint is shown.
(However, some of the borders have been modified to improve visibility.)
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coil fastener joint part of filter cloth 2 Plastic fabric 3 Coiled fastener element row | line | column 3h Engagement head part 3d of coiled fastener element row | line | move Intersection part 4 Coiled fastener element row | line | warp 5 Common loop 7 Core 7a for joining Twisted wire 8 Vertical engagement type joint forming slider 9 Weft 10 Cloth tape 11 Horizontal engagement type joint forming slider 12 Coiled fastener element array fixing core wire 13 Cake 14 Filter cloth 15 Sludge (filtered material)
16 Tensioning device 17 Gap 18 Spiral wire

Claims (3)

Coiled fastener element made of a single synthetic resin wire having a stretchability that is preliminarily molded to be mutually locked at both ends of the plastic fabric body, the filter cloth comprising an endless plastic fabric A row of coiled fastener elements is stretched within a range of 1 to 25% of the reference length dimension at the time of molding. The filter cloth is characterized in that the coiled fastener element rows of the two parts are engaged with each other from above and below, and are joined endlessly by inserting a joining core wire into a common hole formed by the engagement. Filter cloth according to claim 1 Symbol placement, wherein the element color coiled off Asuna over element row is translucent color. Filter cloth according to claim 1 or 2, wherein the bonding wire is twisted made by twisting a plurality of monofilaments.

Images