Nonwoven fabric and production method for same

A technology of non-woven fabric and thickness direction, which is applied in the field of non-woven fabric and its manufacturing, and can solve the problems of air permeability influence and high density

Active Publication Date: 2018-02-16
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the nonwoven fabric subjected to post-processing as described above, at least a part of the nonwoven fabric has a high-density portion, which may affect performance such as air permeability. Therefore, it is desired to develop Non-woven fabric with excellent handleability

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 and production method for same
  • Nonwoven fabric and production method for same
  • Nonwoven fabric and production method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] Using an amorphous polyetherimide whose melt viscosity at 330° C. is 500 Pa·S, extruded through an extruder, and supplied to a nozzle hole diameter D (diameter) of 0.3 mm, L (nozzle length) / D = 10, Meltblown device with a nozzle hole spacing of 0.75mm, a single hole discharge rate of 0.09g / min, a spinning temperature of 390°C, a hot air (primary air) temperature of 420°C, and a nozzle width of 10Nm per 1m 3 Injection is carried out under the condition of / min, and the weight per unit area is 25g / m 2 of non-woven fabrics. At this point, set as Figure 4 A hot air ejection device such as the example shown, so that hot air (secondary air) is blown into the front end of the spinning nozzle of the melt blown device, and the temperature is 2Nm 3 Hot air (secondary air) at a temperature of 260° C. was blown to the front end of the spinning nozzle at a flow rate of 100 ℃. The linear distance d between the front end of the spinning nozzle and the receiving surface of the ro...

Embodiment 2

[0125] Using amorphous polyetherimide with a melt viscosity of 900 Pa·S at 330°C, the spinning temperature is 420°C, the average fiber diameter is 3.7 μm, and the fiber is positioned at the tip of the spinning nozzle with a radius of x The temperature measured by the thermometer on the outer periphery of the hemispheric shape of = 5 cm was 253° C. (that is, the space A was maintained at 38° C. higher than the glass transition temperature of amorphous PEI of 215° C.). The linear distance d between the collection surfaces of the spun fibers, measured by a thermometer placed 1 cm from the collection surface on the straight line, was 261 °C (i.e., keeping point B at a temperature higher than that of the amorphous PEI glass The nonwoven fabric was obtained in the same manner as in Example 1 except that the transition temperature was 46°C higher than 215°C.

Embodiment 3

[0127] Set the weight per unit area to 10g / m 2 , except that, it carried out similarly to Example 2, and obtained the nonwoven fabric.

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Abstract

Provided is a nonwoven fabric that includes fibers the principal component of which is a polymer with a glass transition temperature of 50DC or above, and that has a longitudinal strength of 1 N / 5 cmor greater per 1 g / m2, the nonwoven fabric satisfying both of the following conditions (1) and (2) and making it possible to provide a nonwoven fabric that has ample strength to be handled independently and that contains fibers having as the principal component a polymer with a Tg of 50 DC or above, without performing any post-processing step such as an embossing step, calendaring step and spun lace step. Also provided is a production method for such nonwoven fabric. Condition (1): the density is 0.01-0.4 g / cm3. Condition (2): the proportion of sections having density exceeding 0.4 g / cm3 in across section taken in the thickness direction is 3% or less.

Description

technical field [0001] The present invention relates to non-woven fabrics and methods for their manufacture. Background technique [0002] In recent years, nonwoven fabrics made of ultrafine fibers produced by the meltblown method and the like have been developed and utilized in various applications. For non-woven fabrics using polymers such as polypropylene and polyethylene with a glass transition temperature (Tg) of less than 50°C, it can be obtained without post-processing such as embossing, calendering, and spunlace. Fibers are melt-bonded to each other and have excellent handleability. [0003] However, for a nonwoven fabric using a polymer with a Tg of 50° C. or higher, if the fibers are not melt-bonded or three-dimensionally entangled by post-processing, the strength as a nonwoven fabric is weak, so there are poor handleability and easy Problems such as glitches are generated. [0004] Therefore, such a nonwoven fabric generally adopts a method of solving the probl...

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): D04H3/16D01D5/08
CPCD04H3/009D01D5/084D01F6/64D04H1/42D04H1/56D04H3/16D01D5/0985D01F6/74D01D5/08
Inventor 白石育久城谷泰弘
Owner KURARAY CO LTD
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