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Fiber structure and method for producing same

A manufacturing method and structure technology, applied in the field of fiber structures, can solve the problems of increased pressure loss, reduced collection efficiency, and high dust collection ability, and achieve the effect of suppressing fluff and excellent handling

Pending Publication Date: 2022-03-01
KURARAY KURAFLEX CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Melt-blown non-woven fabrics are composed of fine single fibers, so the ability to capture fine dust is high. On the other hand, due to the fineness, the fiber density inside the non-woven fabric increases, and there is a problem that the pressure loss when the gas passes increases.
[0006] In order to obtain a fibrous structure with a low pressure loss, it is suitable for the single fiber constituting the fiber to have a coarse fineness, but on the other hand, when the single fiber is thickened, the surface area of ​​the fiber in the nonwoven fabric decreases, and the collection efficiency decreases. The problem

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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  • Fiber structure and method for producing same
  • Fiber structure and method for producing same
  • Fiber structure and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0252] (1) Production of ultrafine fiber layer

[0253] For 100 parts by mass of polypropylene (MFR [230°C, 21.18N load] = 700g / 10min), the spinning temperature is 215°C, the air temperature is 215°C, and the air flow rate is 10Nm using a common melt blown equipment. 3 / min, single hole ejection amount 0.036g / hole·min, capture distance 11cm, hole diameter 0.3mm, hole interval 0.75mm to carry out melt-blown spinning, obtained ultrafine fiber sheet (number average fiber diameter of single fiber 1.2μm , unit area weight 10.0g / m 2 , thickness 0.10mm, apparent density 0.10g / cm 3 ).

[0254] (2) Production of non-fine fiber layer

[0255] For 100 parts by mass of polypropylene (MFR [230°C, 21.18N load] = 30g / 10min), the spinning temperature is 260°C, the air temperature is 260°C, and the air flow rate is 13Nm using a common melt blown equipment. 3 / min, single-hole ejection amount 0.3g / hole·min, hole diameter 0.4mm, hole interval 1.5mm, sprays from the nozzle hole, and collects ...

Embodiment 2

[0264] For the ultrafine fiber sheet obtained in Example 1 (1) and the non-ultrafine fiber sheet obtained in Example 1 (2), the ultrafine fiber sheet was superimposed on one of the non-extrafine fiber sheets having convex portions. side, placed on the porous support used in Example 1, and continuously transported along the length direction of the laminate at a speed of 5.0 m / min, and at the same time, using Two nozzles with a hole diameter of 0.10mm (the distance between adjacent nozzles is 20.0cm), the water pressure of the high-pressure water jetted from the nozzles in the first row is set to 3.0MPa, and the water jetted from the nozzles in the second row The water pressure of the high-pressure water flow was set to 5.0 MPa, and the high-pressure water flow was sprayed from the non-ultrafine fiber layer side to carry out the coagulation treatment. Next, charging treatment was performed in the same manner as in Example 1 to obtain a fiber structure in which ultrafine fibers a...

Embodiment 3

[0266] For the ultrafine fiber sheet obtained in Example 1 (1) and the non-ultrafine fiber sheet obtained in Example 1 (2), the ultrafine fiber sheet was superimposed on one of the non-extrafine fiber sheets having convex portions. side, placed on the porous support used in Example 1, and transported continuously along the length direction of the laminate at a speed of 5.0 m / min, and at the same time, using Three nozzles with a hole diameter of 0.10mm (the distance between adjacent nozzles is 20.0cm), the water pressure of the high-pressure water jetted from the nozzles in the first row is set to 3.0MPa, and the water jetted from the nozzles in the second row The water pressure of the high-pressure water stream was set at 5.0 MPa, and the water pressure of the high-pressure water stream sprayed from the third row of nozzles was set at 7.0 MPa, and the high-pressure water stream was sprayed from the non-microfiber layer side to carry out the coagulation treatment. Next, chargin...

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Abstract

Provided is a fiber structure capable of achieving both high collection efficiency and low pressure loss. The fiber structure is obtained by blending and integrating an ultra-fine fiber having a number-average fiber diameter of 4.5 [mu] m or less with a non-ultra-fine fiber having a number-average fiber diameter of 5.5 [mu] m or more, and has protrusions on at least one surface thereof. For example, in the fiber structure, the ultra-fine fibers may be heat-resistant ultra-fine fibers, and the non-ultra-fine fibers may be heat-resistant non-ultra-fine fibers.

Description

[0001] related application [0002] This application claims priority based on Japanese Patent Application No. 2019-131482 filed in Japan on July 16, 2019, and Japanese Patent Application No. 2019-131483 filed in Japan on July 16, 2019, the entire contents of which are hereby incorporated by reference Incorporated as part of this application. technical field [0003] The present invention relates to a fiber structure formed by blending ultrafine fibers and non-ultrafine fibers and a manufacturing method thereof. Background technique [0004] Conventionally, nonwoven fabrics have been used as filter materials for air filters. Among them, a nonwoven fabric made of ultrafine fibers formed by a melt-blown method has a high ability to capture fine dust such as pollen and dust in air. [0005] The melt-blown nonwoven fabric is composed of fine single fibers, so it has a high ability to collect fine dust. On the other hand, due to the fineness, the fiber density inside the nonwove...

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): B01D39/16B01D46/00B32B3/30B32B5/26D04H1/4374D04H1/492D04H1/495D04H1/498D04H3/11
CPCD04H1/4374B32B3/30D04H3/11B32B5/26D04H1/498D04H1/492B01D46/00D04H1/495B01D39/16D04H3/16D04H3/016D04H3/007B01D2239/0618B01D2239/1291B01D2239/10B01D2239/064B01D2239/0622B01D2239/0663B01D2239/1233B01D39/1623B01D2239/065B01D2239/12B01D2239/0428B01D39/1607B01D2239/0457D04H1/4391D10B2505/04
Inventor 中山和之落合彻小畑创一
Owner KURARAY KURAFLEX CO LTD