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Pulling a semiconductor single crystal according to the czochralski method and silica glass crucible suitable therefor

A technology of non-woven fabric and homopolypropylene, which is applied in the field of spun-bonded non-woven fabrics, can solve the problem of not considering the strength of the heat-sealed part, the strength of the heat-sealed part, the softness of the heat-sealed part, and the spinning temperature of the spun-bonded non-woven fabric. Relationship and other issues, to achieve the effect of sufficient heat sealing strength

Active Publication Date: 2015-05-27
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] That is, at present, the strength of the heat-seal portion when the spunbonded nonwoven fabric is used as a surface material of a diaper or the like in the diaper manufacturing process, the sufficient strength of the heat-seal portion when the diaper is worn, and the softness of the heat-seal portion have not been considered at all. In addition, there is no study on the relationship between the heat sealability and the temperature at the time of spinning the spunbonded nonwoven fabric (for example, refer to the following patent documents 1 and 2)

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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  • Pulling a semiconductor single crystal according to the czochralski method and silica glass crucible suitable therefor
  • Pulling a semiconductor single crystal according to the czochralski method and silica glass crucible suitable therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Polypropylene resin with an MFR of 60g / 10min (measured at a temperature of 230°C and a load of 2.16kg in accordance with JIS-K7210) was spunbonded to a nozzle diameter of 0.4mm and a single hole discharge rate of 0.56g / min·hole 1. Extrude at a spinning temperature of 205° C., use a high-speed airflow traction device using an air jet to draw the filament group, and prepare a long fiber woven sheet with an average single filament fineness of 1.5 dtex.

[0078] Next, pass the obtained woven piece between the smooth roller and the embossing roller (pattern specifications: diameter 0.425mm circular, zigzag arrangement, horizontal spacing 2.1mm, vertical spacing 1.1mm, crimping area ratio 6.3%), at temperature Bond the fibers to each other at 135°C and a linear pressure of 35kgf / cm to obtain a weight per unit area of ​​17g / m 2 spunbond nonwoven fabric. Table 1 shows the evaluation results of the obtained spunbond nonwoven fabric together with the production conditions.

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Embodiment 2

[0082] Adjust the ejection amount in Example 1 to obtain an average monofilament fineness of 2.0dtex and a weight per unit area of ​​11g / m 2 spunbond nonwoven fabric. Table 1 shows the evaluation results of the obtained spunbond nonwoven fabric together with the production conditions.

[0083] The obtained spunbonded nonwoven fabric was used to produce a pant-type diaper for adults, and the same wearing evaluation as in Example 1 was implemented. As a result, putting on and taking off was carried out five times, and the heat-sealed portion was not damaged during wearing, showing sufficient strength. Especially in Example 2, regarding the adhesion of the heat-sealed part to other constituent materials of the diaper, not only the adhesiveness of the heat-sealed part was strong and it was difficult to peel off, but also a diaper was obtained in which the heat-sealed part was still soft.

Embodiment 3

[0085] Adjust the ejection amount in Example 1 to obtain an average monofilament fineness of 1.1dtex and a weight per unit area of ​​18g / m 2 spunbond nonwoven fabric. Table 1 shows the evaluation results of the obtained spunbond nonwoven fabric together with the production conditions.

[0086] The obtained spunbonded nonwoven fabric was used to produce a pant-type diaper for adults, and the same wearing evaluation as in Example 1 was implemented. As a result, the same results as in Example 1 were obtained.

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Abstract

　A non-woven fabric comprising fibers of which homopropylene is the main component, characterized in that the MFR of the fibers is 30g / 10mins-65g / 10mins, the mean single fiber fineness of the fibers is 0.5-3.5dtex, the mass per unit area of the non-woven fabric is 5g / m2-40g / m2, the thermocompression bonded area ratio of the non-woven fabric is 5-15%, and the heat seal strength of the non-woven fabric measured at a hot plate temperature of 136°C is at least 6N / 25mm.

Description

technical field [0001] The present invention relates to a nonwoven fabric comprising polypropylene-based fibers. More specifically, the present invention relates to a polypropylene-based fiber that is excellent in heat-sealability and flexibility and is suitable for use as a front sheet, a back sheet, and a side gather portion of an absorbent article used as a hygienic material. spunbond nonwoven fabric. Background technique [0002] In recent years, the popularity of disposable paper diapers has been remarkable, and the production volume has also increased rapidly. For disposable diapers in such an environment, loss reduction in the manufacturing line and stable quality are important. In the diaper manufacturing line, various raw materials can be combined by bonding with heat, heat-sealing, heat lamination, hot melt coating, etc., to manufacture diaper products. In particular, in a pull-on diaper, the side portions are welded and bonded by heat sealing, and strength that...

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): D04H3/007A61F13/49A61F13/511A61F13/514D04H3/16
CPCD04H3/007D04H3/16A61F13/511A61F13/514
Inventor 中东登志子税所一哉矢放正广
Owner ASAHI KASEI KK