JPH0522017U - Filter cloth - Google Patents

Abstract

(57) [Summary] [Purpose] Good in increasing the capture rate of solids such as dust and suspended solids, increasing the treatment amount, and recycling and washing. [Structure] A crimped napped pile having fine crimped portions is formed on a base cloth.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a filter cloth for use as a dust collecting filter cloth for air conditioning, or as a filter cloth for filtering suspended matter in wastewater.

[0002]

[Prior Art]

 Conventional filter cloths use straight line piles of fibers on an woven or knitted base fabric with an adhesive agent, or the tips of the piled fiber piles are bent so that they are parallel to the base fabric for filtration. It was made by forming the surface, or by cutting the pile knitted fabric or pile pile and then splitting the pile.

[0003]

[Problems to be solved by the device]

 However, the above-mentioned conventional filter cloth having a napped pile formed on the base cloth forms a partially sparse space between the piles when used for collecting dust or filtering suspended matter in waste water. Since it is easy, dust and suspended matter easily pass through this space. As a result, the trapping rate of solids is low, and if the pile length is increased in order to increase the trapping rate, the pile becomes weaker and falls down to the base fabric surface to fall asleep easily, resulting in high filtration resistance and treatment. There was a drawback that the amount would decrease.

The present invention has been made in view of the above points, and an object of the present invention is to increase the capture rate of solids such as dust and suspended solids, and to perform treatment without increasing filtration resistance. The object is to provide a filter cloth that is large in amount and is suitable for regeneration by back pressure, suction, and washing.

[0005]

[Means for Solving the Problems]

 The filter cloth according to the present invention comprises crimped pile piles having fine crimped portions formed on a base cloth. Further, of the crimped pile piles formed on the base cloth, only the piles on the front surface side are crimped.

[0006]

[Action]

 Since the three-dimensional fine crimp portion is formed on the filtration surface of the filter cloth, the fine voids formed by the fine crimp of the pile are formed. Further, the minute crimped portions form a large number of contact points with each other, and these contact points can move relatively freely. Therefore, when it is used as a filter cloth for collecting dust or as a filter cloth for filtering suspended solids in waste water, the filter surface has fine voids and numerous contact points, so that the capture rate is improved. Also, when pressure is applied by dust collection or filtration, the contact points between the fine crimp portions move and the filter cloth is compressed, but since the fine crimp portion maintains its three-dimensional structure, fine voids are not formed. It is retained, has low filtration resistance, and has good recovery property against compression. Then, although one end of the crimped napped pile is fixed to the base fabric or the pile knitted fabric, the other end is in a free state and the crimped napped pile can expand and contract like a spring. Makes playback easier.

[0007]

【Example】

 An embodiment of the present invention will be specifically described below with reference to the drawings. Reference numeral 1 is a base fabric woven or knitted with warp and weft. 2 is a crimped pile pile having fine crimped portions 2a formed on the base cloth 1 (see FIG. 1). FIG. 1C is an enlarged explanatory view of one crimped pile pile. The formation of the crimped pile pile 2 is performed by implanting synthetic fibers having latent crimping property that develops crimps by heating, making a filter cloth with napped hair, and then developing the latent crimping property. In order to express the above, the napped pile is heated by dry heat, wet heat, heat roll or the like to cause the napped pile to develop crimp. Further, the structure of the filter cloth before the crimping property is expressed is the one in which the pile 2b of synthetic fibers having latent crimping property is electrostatically flocked by using the adhesive on the base fabric 1 of the woven or knitted fabric, or the pile. The pile 2b, which is a synthetic fiber having a latent crimping property of knitting or pile weaving, may be cut and the pile may be split (see (a) and (b) of FIG. 2).

The yarn for the crimped pile pile is a composite fiber such as a fiber in which synthetic resins having remarkably different heat shrinkage rates are bonded to the side by side or a fiber having a core-sheath structure, and is subjected to predetermined dry heat or wet heat. A product obtained by spinning with latent crimping property is used so that crimping occurs due to the difference in shrinkage upon exposure.

As the latent crimpable fiber, for example, a combination of polyethylene terephthalate (PET) and PET in which 5-sodium sulfoisophthalic acid is copolymerized, or a composite fiber in which PET having very different molecular weights are combined is used. In addition to polyester, other composite fibers may be used.

In order to develop a latent crimping property in a pile piled up on the base cloth 1, as shown in FIG. 3 (a), a fine crimped portion 2a is formed on the entire piled pile, or As shown in FIG. 3B, of the piles formed on the base fabric 1, only the piles on the front surface side are crimped. In order to crimp only the piles on the front surface side, as shown in FIG. 3 (b), a calender treatment in which the flocked filter cloth 5 is passed between the roll 3 at room temperature and the heat roll 4, etc. By

Next, when it is used as a dust collecting filter cloth for air conditioning, as shown in FIG. 4 (a), the crimped pile pile 2 having the fine crimped portions 2 a is attracted by the suction action during dust collection. Although it is pressed and compressed, the fine crimped portion 2a retains three-dimensionality because the pile does not lie on the base fabric 1 due to the structure of the crimped pile pile, the dust collection efficiency is high, and the pressure is high. Loss is also low. Further, as shown in FIG. 4 (b), the crimped pile pile 2 expands and contracts like a spring due to the back pressure or the suction action at the time of reproduction, so that the dust and the like adhering to the pile can be easily separated. Is very easy.

When used as a filter cloth or the like for filtering suspended matter in waste water, as shown in FIG. 5 (a), the crimped napped pile 2 is pushed by the water pressure due to the suction action during filtration. However, due to the structure of the crimped pile pile, the pile does not lie on the base fabric 1 and the fine crimped portion 2a retains three-dimensionality, and the removal rate of suspended matter is high, High filtration capacity due to small filtration resistance. When the filter cloth is sucked and regenerated by air, as shown in FIG. 5B, the crimped pile pile 2 expands and contracts like a spring due to the suction action of air, so that the suspension attached to the pile is suspended. The exfoliation of the substance is easy and the regeneration is very easy.

Example 1 For air conditioning, crimped napped piles having fine crimps and conventional products (A), (B), and (C) in which piles were planted on a base cloth were formed on the base cloth. Table 1 shows the performance comparison with devised products (D) and (E). Polyester 15d fiber was used for each pile. Inventive product (D) uses a product in which only the surface side of the pile is crimped by a calendering process in which the surface temperature of the roll is 200 ° C, and inventive product (E) is dry heat treated at 170 ° C. Then, the whole pile was crimped and used.

[0014]

[Table 1] As can be seen from Table 1, in the conventional product (A), when the pile length is increased to increase the dust collection efficiency, the pile lays on the base cloth due to the wind pressure and the pressure loss increases. Further, when the pile length is shortened to reduce the pressure loss as in the case of the conventional product (C), the dust collection efficiency is lowered and it cannot be put to practical use. On the other hand, the invented product has a low pressure loss and can keep the dust collection efficiency high. Especially, the device (D) had a lower pressure loss than the device (E), and the reproducibility by suction was good. The device (E) had a higher dust collection efficiency than the device (D).

Example 2 Wastewater of a conventional product (F) and (G) in which piles are planted on a base cloth and a device (H) in which only the surface of the pile is crimped is used for filtering suspended substances. A performance comparison for the removal of SS (suspended material) in the is shown in Table 2. All the piles used polyester 15 d fiber.

[Table 2] As can be seen from Table 2, the invented product (H) had a lower SS content in the filtrate and a higher throughput than the conventional product.

[0016]

[Effect of the device]

 As can be seen from the above description, the filter cloth of the present invention has crimped napped piles having three-dimensional fine crimped portions formed on the filtration surface, so that fine voids are formed by the fine crimped portions. Further, many contact points are formed between the fine crimped parts, and these contact points can move relatively freely. Therefore, when it is used as a filter cloth for collecting dust or as a filter cloth for filtering suspended matter in waste water, the filter surface has fine voids and innumerable contact points, so that the capture rate is improved. Also, when pressure is applied by dust collection or filtration, the contact points between the above-mentioned fine crimped parts move and the filter cloth is compressed, but since the fine crimped parts maintain their three-dimensional structure, they are Voids are retained, filtration resistance is low, and recovery from compression is good. In addition, one end of the crimped napped pile is fixed to the base fabric or the pile knitted fabric, but the other end is free, and the crimped napped pile can expand and contract like a spring, so that the filter cloth can be regenerated. Is easy. In particular, when only the surface of the pile is crimped, the pressure loss is small and the reproducibility by suction is good.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part showing an embodiment of the present invention and an enlarged explanatory view of a pile.

FIG. 2 is a cross-sectional view of essential parts showing a crimping process of a pile.

FIG. 3 is a cross-sectional view of essential parts showing a heating step of the pile.

FIG. 4 is a schematic explanatory diagram of a dust collecting filter cloth during dust collection and regeneration.

FIG. 5 is a schematic explanatory diagram at the time of filtration and regeneration of the wastewater filter cloth.

[Explanation of symbols]

 1 Base cloth 2 Crimped pile pile 2a Fine crimped part

Claims (2)

[Scope of utility model registration request] 1. A filter cloth, wherein crimped napped piles having fine crimped portions are formed on a base cloth. 2. The filter cloth according to claim 1, wherein only the pile on the front surface side of the crimped pile pile formed on the base cloth is crimped.