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Nonwoven fabric for cylindrical bag filter, process for producing the same, and cylindrical bag filter therefrom

A bag filter and manufacturing method technology, applied in membrane filters, chemical instruments and methods, filtration and separation, etc., can solve problems such as poor filtration efficiency, reduced filtration area, and can not be called, and achieve excellent capture performance , excellent shape retention effect

Inactive Publication Date: 2010-03-24
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This filter has improved form retention due to overlapping layers of non-woven fabrics, but there is a problem that adjacent non-woven fabrics are partially thermally bonded, and dust is clogged in gaps between the non-woven fabrics
In addition, although the nonwoven fabric disclosed here is used for a cylindrical filter, there is only one layer of nonwoven fabric, and the formation of a cylindrical body cannot be maintained, so it cannot be called a nonwoven fabric for a cylindrical filter precisely.
[0008] In addition, Patent Document 5 discloses a bag filter formed by fixing an intermediate ring to the main body of a filter made of polyester fabric in a cylindrical shape for the purpose of improving shape retention. But there is a problem that the filter area is reduced due to the intermediate ring, so the filter efficiency is poor
In addition, the bag filter may also use pulse jet (Pulse jet) to shake off the attached dust, etc., but there is a problem that the intermediate ring becomes the bending point of the filter during the pulse jet, causing the filter to break

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Nonwoven fabric for cylindrical bag filter, process for producing the same, and cylindrical bag filter therefrom

Examples

Experimental program
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Effect test

Embodiment 1

[0104] Melt polyethylene terephthalate (PET) with an intrinsic viscosity IV of 0.65 and a melting point of 260°C dried to a moisture content of 50 wtppm or less at 295°C, and spinneret at a temperature of 300°C , after being spun out from the fine hole, the single fiber with a circular cross-section shape is spun out with a suction device at a spinning speed of 4400m / min, and the fiber is opened, and it is collected as a fiber web on the moving mesh conveyor belt. . The collected fiber web was thermocompressed with an embossing roller at a temperature of 240°C and a linear pressure of 70kg / cm to obtain a fineness of 2 decitex and a weight per unit area of ​​260g / m 2 The embossing roller consists of a pair of upper rollers and lower rollers that form a plurality of parallel linear grooves on the surface, and it is designed as the groove of the upper roller and the lower roller The grooves intersect at a certain angle, and the convex portion of the upper roll and the convex por...

Embodiment 2

[0106] Melt polyethylene terephthalate (PET) with an intrinsic viscosity IV of 0.65 and a melting point of 260°C dried to a moisture content of 50 wtppm or less at 295°C, and spinneret at a temperature of 300°C , after being spun out from the fine hole, the single fiber with a circular cross-section shape is spun out with a suction device at a spinning speed of 4400m / min, and the fiber is opened, and it is collected as a fiber web on the moving mesh conveyor belt. . The number of punching holes on the net by acupuncture method is 80 holes / cm 2 After interlacing the fibers with the needles, the collected fiber web was thermocompressed using the following embossing rollers at a temperature of 240°C and a linear pressure of 60kg / cm to obtain a fineness of 5 decitex and a weight per unit area of ​​300g / m 2 In the embossing roll, an embossing roll with a woven pattern was used on the upper side, and a smooth roll without unevenness was used on the lower side, and the crimping area...

Embodiment 3

[0108] Polyethylene terephthalate (PET) dried to a moisture content of 50 wtppm or less with an intrinsic viscosity IV of 0.65, a melting point of 260°C, and an intrinsic viscosity IV of 0.66 dried to a moisture content of 50 wtppm or less , Copolyester (CO-PET) with a copolymerization rate of isophthalic acid of 11 mol% and a melting point of 230°C melts at 295°C and 280°C respectively, with polyethylene terephthalate as the core component and copolymerized Polyester is the sheath component. After the spinneret temperature is 300°C and the core: sheath = 80:20 weight ratio, it is spun from the fine hole, and the circular cross-sectional shape is spun at a spinning speed of 4300m / min with an air suction device. The single fiber is charged with a voltage of -30kV by the corona discharge method, the fiber is opened, and it is collected as a fiber web on the moving mesh conveyor belt. The collected fiber web was thermocompressed with an embossing roller at a temperature of 190°C ...

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Abstract

The present invention provides a nonwoven fabric for cylindrical bag filter, wherein a long-fiber nonwoven fabric made of a synthetic fiber is used and the long-fiber nonwoven fabric is a long-fiber nonwoven fabric which is made of a thermoplastic continuous filament and is partially thermocompression-bonded. It is preferable that the circular arc flexural rigidity per basis weight is 0.050 to 1.000 ((cN / 2 cm) / (g / m2)) and the air permeation rate per basis weight is 0.010 to 0.500 ((cc / cm2 / sec) / (g / m2)). Further, there is provided a method for producing a nonwoven fabric for cylindrical bag filter including the steps of: melt-extruding a thermoplastic polymer through a spinneret; sucking and drawing the extrudate with an air sucker to form a thermoplastic continuous filament; allowing the filament to be subjected to electrification opening and to be piled on a moving collection surface to form a fiber web; and allowing the fiber web to be subjected to pressure welding treatment with a flat roll and partially thermocompression-bonding the fiber web with hot embossing rolls to form a long-fiber nonwoven fabric.

Description

technical field [0001] The present invention relates to a nonwoven fabric for a cylindrical bag filter which is suitable for a cylindrical bag filter for a vacuum cleaner and has excellent mechanical properties and rigidity, a method for producing the same, and a cylindrical bag filter made of the same device. Background technique [0002] Conventionally, in the operating environment where dust is generated, vacuum cleaners for the purpose of removing and recovering dust have been used. So far, various woven and nonwoven fabrics have been disclosed as filters for vacuum cleaners. [0003] As the shape of the filter, a pleated shape is known. For example, in Patent Document 1, a thermocompression-bonded long-fiber nonwoven fabric having excellent rigidity is preferably used as a pleated filter. Although, at first glance, it is generally believed that the filter area of ​​the pleated bag filter of the spunbond fabric (spunbond) is increased, and the vacuum cleaner can be min...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16B01D39/14D04H3/00D04H3/07D04H3/14D04H3/16
CPCB01D39/163B01D2239/0216D04H3/14D04H3/16
Inventor 伊藤正士川上龙哉矢挂善和
Owner TORAY IND INC
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