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Nonwoven fabric having improved air permeability and manufacturing method thereof

a technology of nonwoven fabric and air permeability, which is applied in the direction of weaving, bandages, filament/thread forming, etc., can solve the problems of difficult to achieve the original object, soil damage, and conventional nonwoven fabric for agriculture, and achieve excellent air permeability and improved air permeability

Inactive Publication Date: 2014-11-27
TORAY ADVANCED MATERIALS KOREA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide a nonwoven fabric that has excellent air permeability, soft property, and proper resistance. It also aims to offer a production method for economically producing such nonwoven fabric. The nonwoven fabric is made of polytrimethylene terephthalate and polyethylene terephthalate using a filament of different denier. The method involves cooling the filament with cooled air and consolidating it to prevent welding among the filament. Solving the problems in the prior art, this invention offers a nonwoven fabric with excellent air permeability, soft property, and proper resistance, which can be used for various usages.

Problems solved by technology

However, the method of using herbicide is not preferable since it contaminates the soil or kills a microorganism at the soil which will be beneficial on the growth of plants, so that it can be result in devastation of the soil.
However, these nonwoven fabric thicken not to achieve an optimal air flow, and to increase the shielding degree of light, so that the corps take the rootlet into these nonwoven fabric due to misconception as soil and then the corps is withered when dry whether.
Such as the pre-mentioned description, the approach for improving the nonwoven fabric for agriculture relates, for example physical properties of nonwoven fabric, since the conventionally proposed nonwoven fabric for agriculture has drawback that its thick is excess and an air flow is not smooth, and a content of moisture is also excess so that there is a problem that it is difficult to achieve the original object as an inhibition of growth of weed.
But, the conventional nonwoven fabric for agriculture has a drawback that its strength and resistance is insufficient to use as an agricultural usage, although the conventional nonwoven fabric for agriculture has economical advantage since the polypropylene made of it can be produced at low cost.
But, the prior art such as the said one never describes and suggests for a nonwoven fabric and producing method thereof which has a physical property suitable for the nonwoven fabric for agriculture while it has air permeability above a desired level as an economical nonwoven fabric by using PTT.

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

[0036]Polyester having intrinsic viscosity of 0.65 and melting point of 260° C. and polytrimethylene terephthalate having viscosity of intrinsic viscosity of 1.02 and melting point of 225° C. were dried in each dryer to moisture contents of below 100 ppm respectively, and crystallized and then provided with each extruder which temperature of each zone was set at 280° C. and 260° C. respectively. And it were supplied to each spinneret pack of sheath / core shape through each supplying pump, wherein the said packs were consisted of a pack having 52 spinneret holes of diameter of 0.28-0.60 mm and a pack having 240 spinneret holes and were arranged in parallel with each other. Wherein a filament was formed such that the spun polytrimethylene terephthalate was to 20% by weight with respect to total weight, and two kinds of polyester was spun with 285 g per minute to form a filament. The filament was cooled with cold air from a quenching chamber, and consolidated it to prevent welding among...

example 2

[0037]The nonwoven fabrics were manufactured using the same procedure as Example 1 above in the same condition as Example 1 except that polytrimethylene terephthalate was input to 50% by weight with respect to total weight. The nonwoven fabric manufactured in this manner was measured for its properties, and the measurement results were shown in Table 1.

experimental example

[0040]The nonwoven fabrics manufactured in the manner of Examples and Comparative examples were measured for its properties as followings:

[0041](1) weight per unit area (weight: g / m2): it was measured according to the method of ASTM D 3776-1985.

[0042](2) tensile strength: the maximum load was obtained according to the method of ASTM D 1682-64 using the tensile strength and extensometer device (Instron), under condition of sample piece width of 5 cm, its interval of 7.5 cm and tensile velocity of 300 mm / min.

[0043](3) tensile extension: the extension degree was obtained when being maximum extension according to the above method (2).

[0044](4) air permeability: the amount of air which flows after passing through a certain area of the nonwoven fabrics vertically was measured by using an orifice (circular sample piece grasping device) which can test an area of 38 cm2 by the method of KS K 0570.

[0045](5) thickness: it was measured by using the dial gauge.

TABLE 1Compar-Compar-ativeativeItem...

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PUM

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Abstract

A nonwoven fabric having improved air permeability and manufacturing method thereof are presented. The nonwoven fabric has improved air permeability and is formed with long fiber nonwoven fabric of single or multi layer, wherein the long fiber nonwoven fabric is produced by spinning polytrimethylene terephthalate having viscosity of 0.8 to 1.2 and polyethylene terephthalate having viscosity of 0.6 to 0.8 to sheath / core shape with using each spinneret pack which can spin filaments having different denier from each other and arranged in parallel with each other, and then heat pressing with free-embossing or embossing pattern to bind the filaments.The nonwoven fabric has excellent air permeability, softness and resistance, which are required for nonwoven fabric sheets used for various purposes as well as their economical production.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a nonwoven fabric having improved air permeability and manufacturing method thereof, and more particularly to a nonwoven fabric having improved air permeability, in which the nonwoven fabric has excellent air permeability while maintaining a former physical property of the prior nonwoven fabric made of poly trimethyleneterephthalate which has proper durability and softness to be required as an agricultural sheet that can control growth of weeds by covering a soil being planting with the corps, and can be useful as agricultural sheet being capable of produced economically, but has a drawback that its air permeability is unsatisfied, and the method for manufacturing the nonwoven fabric having improved air permeability.[0003]2. Description of the Prior Art[0004]It is common method to defoliate the weeds by spraying herbicide or to root up it with manual labor as weed-proofing or weeding. Ho...

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): D04H1/435D01D5/34
CPCD04H1/435D10B2331/04D01D5/34D01F8/14D04H3/011D04H3/147Y10T442/641Y10T442/608
Inventor PARK, SEO JINKIM, DONG WOOKYOON, JE DEUK
Owner TORAY ADVANCED MATERIALS KOREA