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Spunbond nonwoven fabric

a non-woven fabric and non-woven technology, applied in the field of spunbond non-woven fabrics, can solve the problems of insufficient softness improvement effect, reduced production efficiency, and limited resin use, and achieve high softness, excellent mechanical properties, and complex viscosity of the molten sta

Pending Publication Date: 2020-07-30
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a spun-bonded nonwoven fabric that is soft and has excellent mechanical properties and higher-order processability. The inventors found that the softness of the fabric is correlated with its complex viscosity in a molten state. By setting the fineness, crystal orientation degree, crystallite size, and orientation parameter of the fabric in specific ranges and the complex viscosity in a specific range, they achieved high softness and excellent mechanical properties and higher-order processability. The fabric has low fiber diameter and high crystal orientation, large crystallite size, and high orientation parameter, resulting in high softness and excellent mechanical properties and higher-order processability.

Problems solved by technology

However, since a melt flow rate of resin used therein is low, a softness improving effect thereof is not sufficient, and nonwoven fabrics exemplified in examples thereof are nonwoven fabrics containing low melting point polyolefin-based resin, hence the production efficiency may decrease due to occurrence of filament breakage.
Further, there is also a problem that the resin used is substantially limited.
In the method disclosed in Patent Literature 2, although the softness of the nonwoven fabric can be reliably improved, since the melt flow rate of the resin used therein is low, a softness improving effect thereof is not sufficient.
Moreover, a hole diameter of a spinneret exemplified in examples thereof is as large as 0.6 mmφ, hence spinneret pressure is difficult to be applied, spinning cannot be performed uniformly, and filament breakage and fiber diameter unevenness are generated, which makes it difficult to stably obtain uniform nonwoven fabrics.

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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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0162]A polypropylene-based resin, which is a propylene homopolymer and has a melt mass flow rate of 200 g / 10 min and a melting point of 160° C., was melt-extruded by a single-screw extruder, and the polypropylene-based resin was supplied to a spinning spinneret while being measured by a gear pump. A spinning temperature (spinneret temperature) was set to 230° C., and the polypropylene-based resin was ejected from a spinneret hole having a hole diameter D of 0.30 mm and a land length L of 0.75 mm at a single-hole ejection rate of 0.6 g / min. The used spinning spinneret included an introduction hole which was a straight hole located directly above the spinneret hole, and a connecting portion between the introduction hole and the spinneret hole had a tapered shape. Ejected fibrous resin was cooled and solidified by applying an air flow of 12° C. from an outer side of the filaments (fibrous resin) at a speed of 30 m / min, the air flow being started from a distance of 40 mm from the spinn...

examples 2 , 3

Examples 2, 3, Comparative Example 1

[0164]Spun-bonded nonwoven fabrics were obtained by the same method as Example 1 except that inflow air pressure of the ejector was changed and the spinning speed was changed to 6.9 km / min in Example 2, 3.1 km / min in Example 3, and 2.6 km / min in Comparative Example 1.

[0165]Results thereof are shown in Table 1. It can be seen from Table 1 that the spun-bonded nonwoven fabric obtained in Example 2 has an average single fiber diameter of 11.0 μm, the crystal orientation degree thereof is 0.942, the crystallite size of the (110) plane is 19.4 nm, the orientation parameter thereof is 8.83, and the complex viscosity thereof is 53 Pa·sec, that the spun-bonded nonwoven fabric obtained in Example 3 has an average single fiber diameter of 16.5 μm, the crystal orientation degree thereof is 0.913, the crystallite size of the (110) plane is 14.5 nm, the orientation parameter thereof is 8.05, and the complex viscosity thereof is 57 Pa·sec, and that both of the ...

examples 4 , 5

Examples 4, 5, Comparative Example 3

[0169]Spun-bonded nonwoven fabrics were obtained by the same method as Example 1 except that the melt mass flow rate of the used polypropylene-based resin was changed to 170 g / 10 min in Example 4, 450 g / 10 min in Example 5, and 60 g / 10 min in Comparative Example 3.

[0170]Results thereof are shown in Table 1. It can be seen from Table 1 that the spun-bonded nonwoven fabric obtained in Example 4 has an average single fiber diameter of 13.8 μm, the crystal orientation degree thereof is 0.922, the crystallite size of the (110) plane is 16.5 nm, the orientation parameter thereof is 9.37, and the complex viscosity thereof is 83 Pa·sec, and that the spun-bonded nonwoven fabric has few defects, and is excellent in softness and processability. It can be seen that the spun-bonded nonwoven fabric obtained in Example 5 has an average single fiber diameter of 13.6 μm, the crystal orientation degree thereof is 0.912, the crystallite size of the (110) plane is 12...

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Abstract

Provided is a spunbond nonwoven fabric which is made of a polypropylene fiber and satisfies all of the following conditions A to E: A. the average single fiber diameter of the fiber is 6-17 μm; B. the degree of crystal orientation of the fiber as obtained by wide-angle X-ray diffraction is at least 0.91; C. the crystallite size of the (110) plane of the fiber as obtained by wide angle X-ray diffraction is at least 12 nm; D. the average orientation parameter of the fiber as obtained by Raman spectroscopy is at least 8.0; and E. the complex viscosity of the spunbond nonwoven fabric at a temperature of 230° C. is 20-100 Pa·sec at an angular frequency of 6.3 rad / sec.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This is the U.S. National Phase application of PCT / JP2018 / 035928, filed Sep. 27, 2018, which claims priority to Japanese Patent Application No. 2017-188004, filed Sep. 28, 2017 and Japanese Patent Application No, 2018-141053, filed Jul. 27, 2018, the disclosures of each of these applications being incorporated herein by reference in their entireties for all purposes.FIELD OF THE INVENTION[0002]The present invention relates to a spun-bonded nonwoven fabric which is soft and has excellent mechanical properties and higher-order processability.BACKGROUND OF THE INVENTION[0003]Spun-bonded nonwoven fabrics made of polyolefin, particularly polypropylene spun-bonded nonwoven fabrics, are low in cost and have excellent processability, and are hence widely used mainly in hygienic material applications.[0004]In recent years, as for polypropylene spun-bonded nonwoven fabrics used in hygienic material applications, further improvement in texture, touc...

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): D04H3/007D04H3/16
CPCD04H3/007D04H3/16D04H3/016D04H3/14D01F6/46D01F6/06
Inventor KATSUTA, HIROOFUNATSU, YOSHITSUGUENDO, MASANORI
Owner TORAY IND INC
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