JPH1077541A - Process for producing woven and nonwoven fabrics of fluorine resin fibers - Google Patents

Abstract

(57) [Abstract] [Problem] Water repellency, chemical resistance, used for filters, etc.
Obtaining a highly durable nonwoven fabric. SOLUTION: One of ETFE, PFA and FEP is melt-spun to obtain a 1 to 10 denier fluororesin monofilament, and the fluororesin monofilament is cut into an appropriate length to obtain a fluororesin monofilament fiber 3. A low-melting resin monofilament fiber 4 for bonding is mixed with these fluororesin monofilament fibers 3 to form an agglomerate, and the agglomerate is squeezed while being heated at a temperature higher than the melting point of the low-melting resin monofilament fiber 4. A method for manufacturing a nonwoven fabric, in which a nonwoven fabric M is formed by melting a resin monofilament fiber and bonding a fluororesin monofilament fiber 3 to the fiber 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Woven and nonwoven fabrics made of fluorine resin fibers and having high water repellency and chemical resistance.

[0002]

2. Description of the Related Art Conventionally, woven and non-woven fabrics using a blended yarn of a fluorine resin fiber and a base fiber such as cotton, silk, wool or the like have been proposed. However, these woven fabrics and nonwoven fabrics may deteriorate water repellency and chemical resistance depending on the properties of the base fiber to be blended.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to obtain a woven or non-woven fabric having excellent water repellency, chemical resistance and durability for use in filters.

[0004]

[Means for Solving the Problems]

(First invention) Any one of ETFE, PFA and FEP is melt-spun to obtain a monofilament of 1 to 10 denier, and the monofilament cut to an appropriate length is used as a 100 to 300 denier twisted yarn. A method for producing a woven fabric in which fluorine resin fibers are woven as warp 1 and weft 2.

(Second Invention) After melt-spinning any one of ETFE, PFA and FEP to obtain a 1 to 10 denier fluororesin monofilament, the fluororesin monofilament is cut into appropriate lengths to obtain a fluororesin monofilament. Monofilament fiber 3,

[0006] The monofilament fiber 3
Then, the low-melting resin monofilament fiber 4 for bonding is mixed to form an agglomerate, and the agglomerate is squeezed while being heated at a temperature higher than the melting point of the low-melting resin monofilament fiber 4 to melt the low-melting resin monofilament fiber 4. A nonwoven fabric manufacturing method for forming a nonwoven fabric M by bonding a fluororesin monofilament fiber 3 to the nonwoven fabric M.

(Embodiment of First Invention) An embodiment of the first invention shown in FIGS. 1 and 2 will be described. A 1 to 10 denier fluororesin monofilament is produced by a melt spinning method. After stretching this filament, the length should be 5 to 1
Cut to 5 cm, and use fluororesin monofilament fiber a
make.

Next, a plurality of fluororesin monofilament fibers are twisted to form a 100 to 300 denier fluororesin fiber, and the woven fabric f is woven as warp 1 and weft 2 as shown in FIG. In this case, the weaving density varies depending on the application, but when a filter is used, it is appropriate that the resin warp and the weft are 10 to 50 yarns / inch.

At this time, by making the cross-sectional shapes of the spinning holes different as shown in FIG. 2, for example, by making the warp 1 circular and the weft 2 elliptical, the entanglement can be secured and the efficiency as a filter is improved. can do.

(Embodiment of Second Invention) Next, FIGS.
The embodiment of the second invention shown in FIG. After the spun 1 to 10 denier fluororesin monofilament is drawn, it is cut to 5 to 15 cm to produce a fluororesin filter fiber 3. This fluororesin filter fiber 3
In addition, a low melting point resin monofilament fiber 4 for bonding is mixed to form a mass. As the low-melting point resin monofilament fiber 4 for bonding, a low-melting point resin fiber such as polyethylene or polypropylene is used.

Next, the agglomerated mass is squeezed while being heated at a temperature equal to or higher than the melting point of the low melting point resin for bonding. As a result, as shown in FIG. 4, the low-melting-point resin monofilament fiber 4 for bonding remains as the bonding resin 4a, the monofilament fibers 3 for fluororesin are bonded to each other, and a skeleton structure is formed as a nonwoven fabric as shown in FIG.

If the cross-sectional shapes of the spinning holes are two types, circular and elliptical, and if two types of cross-sectional shapes of fluororesin monofilament fibers 3x and 3y are obtained, as shown in FIG. 3x, 3y
The mutual entanglement is ensured, and the skeletal structure becomes stronger. The cross section is indicated as 3x for a circular one and 3y for an elliptical one.

Furthermore, as shown in FIG. 6, when a low-temperature drawn fluororesin fiber 3f2 drawn at a temperature t1 lower than the melting point of the low melting point resin fiber for bonding is mixed with the fluororesin monofilament fiber 3f1 drawn at the normal temperature t. In the method, the low-temperature drawn fluororesin fiber is drawn at the time of heating and pressing, and the entanglement with the drawn fluororesin fiber at a normal temperature is improved as shown in FIG.

[0014]

[A] Since the woven fabric is formed by the fluorine resin fibers 1 and 2, the filter effect is enhanced when used in a filter or the like because of its excellent water repellency, chemical resistance and durability.

(B) By making the cross-sectional shapes of the warp yarn 1 and the weft yarn 2 different, the entanglement strength between them is improved.

[0016]

[Effect of the Second Invention] a) Since the woven fabric is woven with the fluororesin fibers 1 and 2, it is rich in water repellency, chemical resistance, and durability. As a result, the filter effect is improved.

(B) Fluororesin monofilament fiber 3
The cross-sectional shapes of the non-woven fabrics are made different from each other, whereby the entanglement between the fluororesin monofilament fibers 3x and 3y is promoted, and the strength of the skeleton structure of the nonwoven fabric is enhanced.

{Circle over (c)} A low-melting fluororesin monofilament fiber 3f2 drawn at a normal temperature is mixed with a low-melting fluororesin monofilament fiber having a melting point lower than the melting point of the low-melting resin monofilament fiber 4 for bonding. When squeezing under heating at a temperature equal to or higher than the melting point, the fluororesin monofilament fiber 3f2 drawn at a low temperature is drawn to promote the entanglement of both.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fabric,

FIG. 2 is a perspective view showing the intertwining of warps and wefts having different cross sections,

FIG. 3 is a perspective view of a nonwoven fabric,

FIG. 4 is a perspective view of a nonwoven fabric when a low melting point resin monofilament fiber 4 is mixed,

FIG. 5: Regular temperature drawn fluororesin monofilament fiber 3f1 and low temperature drawn fluororesin monofilament fiber 3f
2 is a perspective view showing a state of entanglement with 2.

FIG. 6 is a perspective view showing the entangled state of the fluororesin monofilament fibers 3x and 3y having different cross sections.

[Explanation of symbols]

(FIGS. 1 and 2) f: woven fabric, 1: warp, 2: weft, (FIGS. 3, 4, 5) M: nonwoven fabric, 3: fluororesin monofilament fiber, 4: low-melting resin monofilament fiber for bonding,
4a: Residual resin for bonding, 3f1: Regular temperature drawn fluororesin monofilament fiber, 3f2: Low temperature drawn fluororesin monofilament fiber, 3x: Fluororesin monofilament fiber having a circular cross section, 3y: Fluororesin monofilament fiber having an elliptical cross section.

Claims (5)

[Claims] 1. One of ETFE, PFA and FEP
Woven fabric obtained by melt-spinning one to obtain a monofilament of 1 to 10 denier, and further cutting the monofilament to an appropriate length as a twist yarn of 100 to 300 denier, using a fluororesin fiber as a warp 1 and a weft 2 Manufacturing method. 2. The method for producing a woven fabric according to claim 1, wherein the warp 1 and the weft 2 have different cross sections. 3. One of ETFE, PFA, and FEP
After melt spun to obtain a fluororesin monofilament of 1 to 10 denier, the fluororesin monofilament is cut into an appropriate length to obtain a fluororesin monofilament fiber 3. The resin monofilament fiber 4 is mixed to form an agglomerate, and the agglomerate is squeezed while being heated at a temperature higher than the melting point of the low melting point resin monofilament fiber 4 to melt the low melting point resin monofilament fiber 4 to obtain a fluororesin monofilament fiber 3. A nonwoven fabric forming the nonwoven fabric M by adhering the nonwoven fabric. 4. The method for producing a nonwoven fabric according to claim 3, wherein the cross sections of the fluororesin monofilament fibers 3 are different. 5. The method for producing a nonwoven fabric according to claim 1, wherein a part of the stretching temperature t of the fluororesin monofilament fiber 3 is set to a low temperature t1.