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Nonwoven fabric and method for producing the same

a nonwoven fabric and nonwoven technology, applied in the direction of filament/thread forming, melt spinning methods, monocomponent polycarbonate artificial filaments, etc., can solve the problems of weak strength, poor handling, and prone to fluff, and achieve the effect of sufficient strength

Inactive Publication Date: 2018-07-05
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a nonwoven fabric that is strong enough to be handled on its own and made from fibers that contain a specific polymer with a high melting point. This fabric does not require any additional post-processing like embossing, calending, or spunlacing. A method for making this nonwoven fabric is also provided.

Problems solved by technology

However, with respect to a nonwoven fabric containing a polymer that has a Tg of greater than or equal to 50° C., unless the fibers are fused to one another or three-dimensionally entangled with one another by performing a post processing, the strength as a nonwoven fabric is weak, therefore, the handleability is poor, and further, there have been problems that fluff is prone to occur, and the like.

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 method for producing the same
  • Nonwoven fabric and method for producing the same
  • Nonwoven fabric and method for producing the same

Examples

Experimental program
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Effect test

example 1

[0087]Amorphous polyetherimide having a melt viscosity at 330° C. of 500 Pa·s was used, and extruded with an extruder to be supplied to a melt blown device having a nozzle with a nozzle hole diameter D (diameter) of 0.3 mm, L (nozzle length) / D=10, and a nozzle hole pitch of 0.75 mm. By blowing hot air to the amorphous polyetherimide at a single hole discharge rate of 0.09 g / min, a spinning temperature of 390° C., a hot air (primary air) temperature of 420° C., and 10 Nm3 / min per 1 m of nozzle width, a nonwoven fabric having a basis weight of 25 g / m2 was produced. At this time, a hot air injection device as in the example shown in FIG. 4 was arranged so that hot air (secondary air) blows into a tip of the spinning nozzle of the melt blown device, and hot air (secondary air) at a temperature of 260° C. was blown at a flow rate of 2 Nm3 toward the tip of the spinning nozzle. The direct distance d between the tip of the spinning nozzle and a receiving surface of a roller receiving the s...

example 2

[0088]A nonwoven fabric was obtained by using amorphous polyetherimide having a melt viscosity at 330° C. of 900 Pa·s in the similar manner as in Example 1 except that the spinning temperature was 420° C., the average fiber diameter was 3.7 μm, and the temperature measured by a thermometer positioned on a hemispherical outer periphery of a radius x=5 cm around the tip of the spinning nozzle was 253° C. (that is, space A was maintained at a temperature higher than 215° C. that is a glass transition temperature of the amorphous PEI by 38° C.), and the temperature measured by a thermometer arranged so as to be positioned 1 cm from the collection surface on the straight line relative to the direct distance d between the tip of the spinning nozzle and the collection surface of the spun fibers was 261° C. (that is, point B was maintained at a temperature higher than 215° C. that is a glass transition temperature of the amorphous PEI by 46° C.).

example 3

[0089]A nonwoven fabric was obtained in the similar manner as in Example 2 except that the basis weight was changed to 10 g / m2.

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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Abstract

A nonwoven fabric including fibers that contain a polymer having a glass transition temperature of greater than or equal to 50° C. as a main component, and having a vertical strength of greater than or equal to 1 N / 5 cm per 1 g / m2, and by satisfying both of the following conditions (1) and (2), a nonwoven fabric having sufficient strength to be handled alone and including fibers that contain a polymer having a Tg of greater than or equal to 50° C. as a main component without performing a post processing such as emboss processing, calender processing, or spunlace processing, and a method for producing the nonwoven fabric can be provided. (1) A density is 0.01 to 0.4 g / cm3. (2) A proportion of parts with a density exceeding 0.4 g / cm3 is less than or equal to 3% in a cross section in a thickness direction.

Description

TECHNICAL FIELD[0001]The present invention relates to a nonwoven fabric, and a method for producing the nonwoven fabric.BACKGROUND ART[0002]In recent years, a nonwoven fabric made of ultra-fine fibers produced by a melt blown method or the like has been developed, and is used for various applications.[0003]With respect to a nonwoven fabric containing a polymer having a glass transition temperature (Tg) of less than 50° C., such as polypropylene and polyethylene, a nonwoven fabric excellent in the handleability, in which fibers are fused to one another, can be obtained without performing a post processing such as emboss processing, calender processing, or spunlace processing.[0004]However, with respect to a nonwoven fabric containing a polymer that has a Tg of greater than or equal to 50° C., unless the fibers are fused to one another or three-dimensionally entangled with one another by performing a post processing, the strength as a nonwoven fabric is weak, therefore, the handleabil...

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(United States)
IPC IPC(8): D04H3/16D01D5/098D01F6/74
CPCD04H3/16D01D5/0985D01F6/74D04H3/009D01D5/084D01F6/64D04H1/42D04H1/56D01D5/08
Inventor SHIRAISHI, IKUHISASHIROTANI, YASUHIRO
Owner KURARAY CO LTD
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