JPH11269737A - Monofilament and screen gauze made of it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monofilament and a woven fabric excellent in abrasion resistance and dimensional stability, and a screen gauze excellent in abrasion resistance, dimensional stability and printing characteristics. SOLUTION: A monofilament having a strength of 12 g / d or more and an elastic modulus of 300 g / d or more to which 1% by weight or more of a polysiloxane and / or a fluororesin is adhered is used. In the formula, X1, X2, X3 and X4 represent -H, -OH,
—COOH, —R, —NH ₂ , —ROH, —RNH ₂ ,
-RCOOH, represents -RNH _2, R represents an alkyl group or an aryl group. M and n each represent an integer of 1 or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength, high-modulus monofilament having improved abrasion resistance, and a woven fabric and a screen girder using the monofilament.

[0002]

2. Description of the Related Art Hitherto, as a high-precision woven fabric used for industrial purposes, a woven fabric using a molten liquid crystalline polyester monofilament or a para-aramid monofilament has been known. The woven fabric obtained by using the monofilament was less likely to cause irregular physical deformation, and had excellent dimensional stability.

[0003]

However, such a high-strength high-modulus fiber is weak in a direction perpendicular to the fiber axis fiber because the molecular chains are highly oriented in the direction of the fiber axis, and easily rubbed by friction. Had the problem of fibrillation.
For this reason, when used or weaved for applications in which excessive friction occurs, there is a problem that fluff and scum are generated, resulting in insufficient weaving and durability.

[0004]

According to the present invention, there is provided (1) a monofilament having a strength of at least 12 g / d and an elastic modulus of at least 300 g / d to which 1% by weight or more of a polysiloxane and / or a fluororesin is adhered; ) 12 g strength of 1% by weight or more of polysiloxane and / or fluororesin
/ D, a liquid crystalline polyester monofilament or a para-aramid monofilament having an elastic modulus of 300 g / d or more, and (3) a strength of 12 g / d or more to which 1% by weight or more of polysiloxane and / or fluororesin is adhered. ,
A woven fabric composed of a monofilament having an elastic modulus of 300 g / d or more, (4) a monofilament having a strength of 12 g / d or more and an elastic modulus of 300 g / d or more to which 1% by weight or more of a polysiloxane and / or a fluororesin is adhered. It relates to a screen gauze made of woven fabric.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The polysiloxane used in the present invention is not particularly limited, but is preferably one comprising a repeating unit represented by the following chemical formula 1. By adding polysiloxane, the wear resistance and weaving properties of the high-strength high-modulus monofilament can be remarkably improved, and especially when the filament is woven and used as a screen gauze, the lubricity of the fabric is improved. , Water repellency and oil repellency can be imparted, so that the permeability of the printing paste is improved, and the abrasion resistance is also remarkably improved, so that an excellent screen gauze can be obtained.

[0006]

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In the formula, X1, X2, X3 and X4 are-
H, -OH, -COOH, -R, -NH 2, -ROH,
-RNH _2, represents -RCOOH, the -RNH _2, R is an alkyl group or ants - show Le group. M and n each represent an integer of 1 or more. In terms of low chargeability, X1,
X2, X3 and X4 (hereinafter sometimes simply referred to as X) are preferably polysiloxanes composed of a hydrogen atom, an alkyl group or an aryl group, and more preferably a polysiloxane in which X is a methyl group (dimethylpolysiloxane). The viscosity (25 ° C.) of the polysiloxane is preferably from 1 to 200,000 centistokes from the viewpoints of processability, adhesion to fibers, and the like.

When the surface of the woven fabric is low in charge, dust and the like are suppressed from being sucked and clogging is hardly caused. Therefore, a remarkable effect is obtained particularly when a screen mesh for small printing for high precision printing is used. And printing can be performed smoothly and at high speed because there is no accumulation of static electricity. X1, X
Fibers provided with polysiloxanes in which 2 and X4 are -CH3 and X3 is -OH have high surface smoothness and workability, and are also excellent in abrasion resistance. Is clear and a screen gauze with more excellent ink removal is obtained.

Excellent effects can also be obtained by using a fluorine-based resin instead of polysiloxane. Although the fluororesin referred to in the present invention is not particularly limited, tetrafluoroethylene (PTFE), tetrafluoroethylene-ethylene copolymer (ETFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polychlorotrifluoro Preferable examples include ethylene (PCFE). In order to emulsify or disperse this, an emulsifier, a modifier and the like may be added. The desired monofilament (fabric) is obtained by baking it after attaching it to the fiber (fabric).

Examples of these resins include "Polyfuran" and "Neoflon" manufactured by Daikin Industries, Ltd., "Emuraron" manufactured by Acheson Japan, "Sumiflunon" manufactured by Sumitomo Chemical Co., Ltd., and "Lumiflon" manufactured by Asahi Glass Co., Ltd.
And the like. After applying the emulsion or dispersion of the fluorine-based resin, it may be heated and fired at 350 ° C. or higher. By providing a fluororesin, the wear resistance at the time of wetting and at a high temperature can be remarkably improved.

The polysiloxane and / or the fluororesin have a total adhesion amount of 1% by weight or more / fiber weight, preferably 2% by weight or more / fiber weight, and more preferably 3% by weight in order to sufficiently exhibit the effects of the present invention. % / Fiber weight, particularly preferably 5% by weight / fiber weight. 100% by weight in view of cost and wire diameter fluctuation
It is preferable that the ratio is not more than 30% by weight / fiber weight / fiber weight, particularly preferably not more than 15% by weight / fiber weight.

In the present invention, a polysiloxane and a fluorine resin may be used in combination. In this case, excellent abrasion resistance can be obtained even when wet and at a high temperature, and when a screen gauze is used, more remarkable effects can be obtained, such as further increasing the permeability of the printing paste. The ratio of the polysiloxane to the fluorine-based resin is preferably from 1: 9 to 9: 1, particularly preferably from 5: 5 to 9: 1, from the viewpoint of the adhesiveness between the resin and the fabric and the abrasion resistance at high temperatures and when wet. . The method for applying the polysiloxane and / or the fluorine-based resin is not particularly limited, and the polysiloxane and / or the fluororesin may be separately attached in two steps or may be applied as a mixed solution in one step. Of course, only one component may be provided.

When a polysiloxane and / or a fluororesin is applied, it is preferable to apply an emulsified one from the viewpoint of further improving the surface smoothness of the fiber.
As the emulsifier, a nonionic, anionic or cationic emulsifier may be used. For example, polyoxyethylene alkylphenyl ether, quaternary ammonium salt, sodium alkylbenzenesulfonate and the like can be mentioned. The amount of the emulsifier used is suitably about 1 to 50 parts by weight based on 100 parts by weight of the total amount of the polysiloxane and / or the fluororesin.

In order to further enhance the surface smoothness, a compound comprising an aminopolysiloxane-based compound at 50% by weight or less, another polysiloxane at 50% by weight or more, and a catalyst capable of causing a crosslinking reaction (in some cases, further comprising After adhering to the fiber a mixture of fluororesin, etc., 12
A method of performing heat treatment at a temperature of about 0 to 250 ° C. can be suitably used. Examples of the catalyst include zinc, tin, lead, titanium, potassium, and magnesium organic acid salts. The amount is preferably 5 to 25% by weight based on the total weight of the polysiloxane.

From the viewpoint of lowering the chargeability, those containing no surfactant (non-emulsified) are preferred. It is more preferable to dilute the polysiloxane and / or the fluorine-based resin with a low-viscosity mineral oil because not only the chargeability can be further reduced, but also the fiber surface and / or the fabric surface can be uniformly attached. When the polysiloxane and the fluorine-based resin are used in combination, the above-mentioned emulsion and dispersion may be applied in two liquids, respectively, or may be simultaneously used in the same bath. In the process, it is preferable to treat in the same bath. Of course, a dispersant dispersed in water or the like may be applied.

The polysiloxane and / or the fluororesin may be applied after the fabric is manufactured. However, from the viewpoint of suppressing the generation of fibrils in a processing step such as a weaving step and improving the durability, the polysiloxane and / or the fluorosiloxane resin are used. It is preferable to produce a fabric using fibers to which a fluororesin is attached. In particular, it is preferable that the fiber surface is substantially coated with the composition, and it is more preferable that the fiber surface is uniformly coated.

For example, a certain concentration (stock solution or diluent)
, A method of discharging the solution of (1) to a running yarn at a constant speed from a crow mouth or the like, a method of running the yarn on a rotating roller partially immersed in a solution containing polysiloxane and / or a fluororesin, Alternatively, a method of running in a solution containing a fluororesin and squeezing at an angle or the like may be used. The polysiloxane and the fluororesin may be provided simultaneously,
Also, they may be provided separately. This is 100 ~ 30
Drying at 0 ° C. gives the desired fibers. When a fluorine-based resin is applied, 250 to 350
It is preferable to perform the heat treatment at a temperature of ° C. When a cross-linking reaction is to be caused, it is preferable to pass through a hot-air treatment machine capable of continuous treatment in order to further heat-treat or simultaneously perform drying and heat treatment at a high temperature.

The monofilament used in the present invention has a strength of 1.
It is a fiber having an elastic modulus of 2 g / d or more, an elastic modulus of 300 g / d or more, preferably a strength of 15 g / d or more, an elastic modulus of 400 g / d or more, more preferably 20 g / d or more, and an elastic modulus of 500 g / d or more. Those having a low strength and a low elastic modulus are inferior in dimensional stability. Even if polysiloxane and / or a fluorine-based resin is provided, a remarkable effect as in the present invention cannot be obtained.
The fineness may be set as appropriate, but from the viewpoint of handleability, mechanical performance, abrasion resistance, etc., those having a fineness of about 1 to 300 d can be widely used, and the effect of the present invention is remarkably obtained. The monofilament of the present invention may be cut and used, but it is preferable to use the filament in a state of dimensional stability, mechanical performance, abrasion resistance, etc., and also from the viewpoint of surface smoothness, etc. When weaving is performed using a monofilament rather than a yarn, a woven fabric and a screen gauze having excellent performances such as dimensional stability and abrasion resistance can be obtained.

The screen gauze is not only required to have various performances such as mechanical strength and abrasion resistance, but also has a smooth screen gauze surface and a good passability of a printing paste and a printing finish. It is required that the fabric is good, and especially, a fabric having a small fineness and a small mesh size, which is used as a screen gauze for high-precision printing, is liable to have a lowering of the printing paste and the clogging. Although smoothness of the surface was further desired because of easy occurrence, according to the present invention, a screen gauze having a smooth surface and excellent performance can be obtained.

The type of the fiber is not particularly limited, and may be appropriately set according to the purpose. Examples thereof include polyester fibers (including polyarylate fibers), nylon fibers, para-aramid fibers such as paraphenylene terephthalamide, high molecular weight polyethylene fibers, and polyvinyl alcohol fibers.

Among them, at least one of a liquid crystalline polyester and / or para-aramid having high strength, high elastic modulus, excellent chemical resistance, heat resistance, etc., and high affinity with polysiloxane and fluorine resin is used. It is preferable to use the contained fiber. Although such fibers have features such as high mechanical strength and excellent chemical resistance, they have a problem that they are liable to be fibrillated, so that a more remarkable effect is obtained when used in the present invention. In particular, more excellent effects can be obtained when a molten liquid crystalline polyester monofilament is used. When a fabric is used, the fiber is preferably used in an amount of 30% by weight or more, more preferably 50% by weight or more, particularly preferably 80% by weight or more of the fabric.

The term “molten liquid crystalline (anisotropic)” as used in the present invention means:
To exhibit optical liquid crystallinity (anisotropic) in the molten phase. For example, it can be recognized by placing the sample on a hot stage, heating and heating the sample in a nitrogen atmosphere, and observing the transmitted light of the sample. The aromatic polyester used in the present invention comprises repeating structural units such as aromatic diols, aromatic dicarboxylic acids, and aromatic hydroxycarboxylic acids.
Preferred are those composed of a combination of repeating structural units shown in (1).

[0023]

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[0024]

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[0025]

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Particularly preferred is a polymer comprising a combination of the repeating structural units (A) and (B) shown in Chemical Formula 4. In particular, a polymer in which the portion composed of the repeating structural units of (A) and (B) is 65% by weight or more is preferable, and a polyester in which the component (B) is 4 to 45% by weight is particularly preferable.

The melting point (MP) of the molten liquid crystalline polyester is preferably from 260 to 360 ° C., more preferably from 270 to 350 ° C. The melting point referred to here is the main endothermic peak observed by differential scanning calorimetry (DSC: for example, TA3000 manufactured by mettler).
This is the peak temperature of the peak (JIS K7121). In particular,
DSC (for example, TA3000 manufactured by Mettler)
After taking 10 to 20 mg of sample and sealing it in an aluminum pan,
An endothermic peak is measured when nitrogen is flowed at 100 cc / min as a carrier gas and the temperature is raised at 20 ° C./min. If a clear endothermic peak does not appear in the first run depending on the type of the polymer, the temperature is raised to a temperature 50 ° C. higher than the expected flow temperature at a temperature rising rate of 50 ° C./min. After melting completely for one minute, it is preferable to cool to 50 ° C. at a rate of 80 ° C./min and then measure the endothermic peak at a rate of temperature rise of 20 ° C./min.

The molten liquid crystalline polyester includes polyethylene terephthalate, modified polyethylene terephthalate,
Polyolefin, polycarbonate, polyarylate,
Polyamide, polyphenylene sulfide, polyetheresterketone, fluororesin thermoplastic polymer may be added, and inorganic substances such as titanium oxide, kaolin, silica, barium oxide, carbon black, and coloring agents such as dyes and pigments And various additives such as antioxidants, ultraviolet absorbers and light stabilizers.

In order to further improve the wear resistance,
It is preferable to use a conjugate fiber (core-sheath type, laminated type, laminated type, etc.) or a mixed spun fiber (sea-island fiber, etc.) containing the molten liquid crystalline polyester as one component. In particular, the core component is a molten liquid crystalline polyester (A polymer). -), It is preferable to use a core-sheath type composite fiber in which the sheath component is a flexible thermoplastic polymer (B polymer). When fabrics (woven fabrics and the like) are manufactured, a plurality of types of fibers may be used in combination. It is preferable to use 30% by weight or more, more preferably 50% by weight or more, particularly 80% by weight or more of the conjugate fiber.

The flexible thermoplastic polymer may be appropriately selected and includes, for example, polyolefin, polyamide, polyester, polyarylate, polycarbonate, polyphenylene sulfide, polyester ether ketone, and fluororesin. Particularly preferred are polyphenylene sulfide (PPS) and polyethylene naphthalate. By using the flexible thermoplastic polymer as the sea component, the fibril resistance and the abrasion resistance are greatly improved. Above all, it is more preferable to use PPS which is excellent in strength and heat resistance and has high spinnability with molten liquid crystalline polyester. In addition, the flexible polymer referred to in the present invention is:
A polymer having no aromatic ring on the main chain and a polymer having an aromatic ring on the main chain and having four or more atoms on the main chain between the aromatic rings.

In the present invention, not only the flexible thermoplastic polymer but also the flexible thermoplastic polymer is used as the sheath component.
It is preferable to use a blend of (B polymer) and a molten liquid crystalline polyester (C polymer). By forming the sheath component from a blend of a liquid crystalline polyester and a flexible polymer (especially a sea-island structure), the strength of the sheath component can be increased and the adhesiveness between the sheath component and the core component can be significantly increased. Shows even better wear resistance. Such fibers have a high strength and a high elastic modulus and are excellent in fibril resistance. Therefore, especially when used as a screen gauze, the gauze tension can be increased, and the elastic recovery and dimensional stability are also good. The application of the gauze used for the fine wire to the use is sufficiently possible. As the C polymer, the same molten liquid crystalline polyester as the A polymer can be used, and the A polymer and the C polymer may be the same or different. Preferably, a polymer having a melting point (MP) of the B polymer + 80 ° C. or lower and an MP of -10 ° C. or higher is preferable.

In the present invention, it is preferable to increase the blending ratio of the B polymer rather than the C polymer. When the blending ratio of the flexible B polymer is higher than that of the C polymer, a sea-island structure in which the B polymer is a sea component and the C polymer is an island component is considered to be formed. In this case, the abrasion resistance is excellent. B
It is considered that the strength and dimensional stability of the sheath component are remarkably improved by the fact that the polymer substantially exists on the fiber surface and the C polymer having rigidity and excellent mechanical performance constitutes an island structure. It is presumed that the diameter of the island component is preferably about 0.1 to 2 μm. The sea-island structure according to the present invention means a state in which tens to thousands of islands are present in a sea component serving as a matrix in a fiber cross section. The number of islands can be adjusted by changing the mixing ratio, melt viscosity, and the like of the B polymer and the C polymer. It is obtained by chip blending the B polymer and the C polymer, or by mixing a melt of both components with a static mixer or the like.

The C polymer ratio in the sheath component (C / (B +
C)), from the viewpoint of strength and fibril resistance.
It is preferably 25 to 0.5. The C polymer ratio can be determined from a micrograph of the cross section of the fiber, but can also be determined from the volume ratio of the ejection amounts of the core component and the sheath component during production.

The core component ratio in the composite fiber is determined by the mechanical strength,
0.25 to 0.80, especially 0.4 to 0.8 in terms of wear resistance
It is preferably set to 0.7. In particular, when the sheath component is composed of the B polymer and the C polymer, the sheath component also contributes to the improvement in strength, so that even when the core component ratio is reduced, an excellent composite fiber having a strength of 15 g / d or more is obtained. be able to. In addition, the core component ratio in the present invention indicates the cross-sectional area ratio A / (A + B + C) of the conjugate fiber. The cross-sectional area ratio can be determined from a micrograph of the cross-section of the fiber, but can also be determined from the volume ratio of the discharge amount of the core component and the sheath component during production.
The fiber diameter variation rate of the obtained fiber is preferably -10 to + 10%, more preferably -8 to + 8%, and the conjugation degree (the number of times of guide abrasion) is preferably 300 or more.

When a fiber containing at least one component of the molten liquid crystalline polyester is used, the fiber already has sufficient strength and elastic modulus only by spinning, but its performance can be further improved by relaxation heat treatment or strain heat treatment. The heat treatment can be performed in an inert gas atmosphere such as nitrogen, an oxygen-containing active gas atmosphere such as air, or under reduced pressure. The heat treatment atmosphere is preferably a low humidity gas having a dew point of -80 ° C or less. Preferred heat treatment conditions include a temperature pattern in which the temperature is gradually increased from the melting point of the core component of -40 ° C or lower to the melting point of the sheath component polymer or lower. The processing time is several minutes to several tens hours depending on the purpose. Heat can be supplied by a method using a medium such as a gas, a method using radiation by a heating plate, an infrared heater, or the like, a method using a heat roller, a heat plate, or the like, or a method using high frequency. There are internal heating methods used.

The treatment is carried out under tension or without tension depending on the purpose. The shape of the treatment may be a scallop shape, a tow shape (for example, performed on a metal net or the like), or a continuous treatment between rollers. The tension heat treatment is preferably performed at a temperature not higher than the melting point of the core component −80 ° C. and applying a tension of 1 to 10% of the cutting strength.
In particular, the elastic modulus is further improved.

Although the monofilament of the present invention is excellent in various performances, it can be used for all kinds of applications. In particular, since the monofilament is excellent in abrasion resistance, a remarkable effect can be obtained when it is used in applications where abrasion occurs. When processed into a knit,
A fabric excellent in durability and quality can be obtained. In particular, the effect of the present invention is remarkably obtained when the woven fabric is formed through a weaving process. The method for producing the woven fabric is not particularly limited, and a plain woven fabric or the like may be used by a known method. In the present invention, an excellent effect is obtained particularly when a woven fabric is used as a screen gauze. Generally, when a high-density, fine-grained woven fabric using fineness is used as a screen gauze,
Although it is difficult for the strike to pass through and it is difficult to perform high-precision printing, in the present invention, fibrils are hardly generated due to high abrasion resistance, and because fibers having excellent water repellency and oil repellency are used, irradiation is performed. No emulsion fall off,
A screen is obtained in which the outline of the emulsion is clear and ink is easily removed.

When used as a screen gauze or the like, 15
It is preferable to use a plain woven fabric having a mesh size of 0 to 500 mesh, particularly 200 to 400 mesh. In the case of a monofilament having an average wire diameter of 5 to 70 μm, particularly an average wire diameter of 35 μm or less, the effects of the present invention can be more remarkably obtained. . The screen gauze obtained according to the present invention can stably perform fine and clear printing in the field of screen printing such as pattern printing, character printing, intaglio printing or color printing. .

[0039]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited thereto. [Melt viscosity MV] It was measured using a Toyo Seiki Capillograph Model 1C under the conditions of 300 ° C. and shear rate r = 1000 sec ⁻¹ . [Logarithmic viscosity ηinh] Convert sample to pentafluorophenol
0.1% by weight was dissolved (60-80 ° C), and the relative viscosity (ηrel) was measured using an Upperod viscometer in a thermostat at 60 ° C.
ηinh = ln (ηrel) / c. Here, c is the polymer concentration (g / dl).

[Strength g / d, elongation%] JIS L10
Test length 20cm, initial load 0.1g / d, tensile speed 10cm according to 13.
The breaking elongation at break was determined under the condition of / min, and an average value of 5 or more points was adopted. [Elastic modulus g / d] A strength-elongation curve is created, and the elastic modulus = (w / D) / (ΔL / L) is calculated from a straight line portion according to Hooke's law near the origin of the curve. In addition,
w is the load g when ΔL is extended, D is the denier of the fiber,
ΔL indicates the length extended by the load, and L indicates the original fiber length.

[Wire diameter variation%] Outer diameter measuring instrument M- made by ZIMMER
Using 4609A / 2, the wire diameter of a filament having a length of 100 m was continuously recorded at a yarn speed of 20 m / min, and the maximum (max), minimum (min) and average value (x) were measured. Wire diameter variation (%) = ± ((max−min) / 2 ×) × 1
00 The larger the variation of the wire diameter, the more the sheath component is peeled or dropped.

[Abrasion resistance times] TM manufactured by Daiei Scientific Instruments
With an angle of 120 degrees using a tying tester
Six monofilaments are passed through each of the comb guides, a load of 1 g / d is applied to each filament, a reciprocating motion is applied at a stroke length of 3 cm and a speed of 95 times / minute, and fluff (peeling, fibrillation) is performed. Was measured.
[Weaving process property] After weaving the screen, the fiber surface was observed with an optical microscope.
When peeling was rarely observed, ○ was observed, peeling occurred occasionally, and X was observed when peeling was observed frequently.

[Examples 1 to 4] The polymer A was prepared from a liquid crystalline polyester (MP = 277 ° C., MV) in which the structural units (A) and (B) represented by the above formula (3) were 73/27 mol%. = 430p
oise, ηinh = 5.21 dl / g), and the spinning temperature is 310 ° C.
Melt spinning was performed at a spinning speed of 1100 m / min to obtain a 9dr monofilament. The spun yarn is wound around a bobbin with a density of 0.57 g / cc, and is wound under a nitrogen atmosphere.
0 ° C x 1 hour, 220 ° C x 1 hour, 262 ° C x 6 hours,
Heat treatment was performed at 272 ° C. × 10 hours. The performance of the obtained heat-treated yarn was 9.1 dr denier and 23.22 g / strength.
d, elongation was 3.41%, and elastic modulus was 523.5 g / d.

A polysiloxane in which X1, X2 and X4 in Formula 1 are -CH3 and X3 is -OH is discharged as an emulsion from the glass port at a rate of 0.1 cc / min onto the heat-treated yarn, and adheres to the running yarn at 100 m / min. Then, the mixture was led to a 2 m-long hollow drier kept at 250 ° C. and dried and heat-treated to produce monofilaments having a coating agent adhesion rate (% by weight) as shown in Table 1. This filament was used as a warp and a weft to form a plain weave of 300 mesh, but both had good weaving properties and good abrasion resistance with little fluff. In particular, the monofilaments of Examples 1 and 2 had small fluctuations in wire diameter and were excellent in wear resistance.

A printing test was performed using the obtained plain woven fabric as a screen gauze. The screen gauze obtained in the examples showed that the unirradiated emulsion had good elimination, the outline of the emulsion was clear, and the ink was clear. The omission was also excellent. In addition, because of its high dimensional stability, the number of times that printing can be performed more favorably than that of stainless steel screen gauze is large. Table 1 shows the results.

Comparative Examples 1 and 2 The same procedure as in Example 1 was carried out except that the amount of polysiloxane was changed.
In all cases, since the polysiloxane was not sufficiently adhered, fibrils were generated in the weaving process, and especially in Comparative Example 1, the screen printing could not be performed well.
Also in Comparative Example 2, fibrils were generated, and the outline of the emulsion was unclear and the ink bleeding was inferior to that of the Examples, resulting in insufficient printing performance. Table 1 shows the results.

[0047]

[Table 1]

[Examples 5 to 8 and Comparative Example 3] Using a fluororesin, tetrafluoroethylene (PTFE) instead of polysiloxane, to a 2 m long hollow dryer kept at 370 ° C. after resin adhesion. The procedure was the same as in Example 1 except that the drying and heat treatment were conducted. Table 2 shows the results. The printing performance of the screen gauze obtained in Examples 5 to 8 was as high as in Example 1, but in Comparative Example 3, fibrils were generated in the weaving process, and the performance as a screen gauze was obtained. Was inadequate.

Example 9 A spun yarn obtained in the same manner as in Example 1 was wound around a bobbin having a hole density of 0.57 g / c.
c, and heat-treated at 265 ° C. for 18 hours under a nitrogen atmosphere to produce a heat-treated yarn. The performance of heat-treated yarn is denier
9dr, strength 23.32 g / d, elongation 3.39%, and elastic modulus 522.1 g / d. 70 parts by weight of polysiloxane and 30 parts of tetrafluoroethylene were added to the heat-treated yarn.
The imparting agent consisting of parts by weight is adhered, guided to a 2 m-long hollow dryer kept at 370 ° C., and subjected to drying and heat treatment.
A monofilament was produced in the same manner as in Example 5. Such a filament was excellent in abrasion resistance even at high temperature and when wet. Table 2 shows the results. These filaments were used for warp and weft to form a plain weave of 300 mesh, all of which have good weaving properties, are less abrasion-resistant and more wear-resistant, and have excellent performance as screen gauze. Met.

[0050]

[Table 2]

Example 10 The same liquid crystalline polyester as in Example 1 was used as a core component, 67 parts by weight of linear polyphenylene sulfide (melt viscosity 1100 poise ^-1 , temperature 300 ° C.) and 33 parts by weight of molten liquid crystalline polyester. In order to produce a core-sheath type composite fiber having a blend as a sheath component,
The core component and the sheath component are melted from separate extruders, compounded so that the weight ratio of the core and the sheath is 2: 1, and using a spinning pack shown in FIG. More 31
Composite spinning was performed at 5 ° C. and 800 m / min to produce 9-denier monofilament. The strength of the obtained fiber is 1
8.2 g / d, elastic modulus 531 g / d, elongation 3.5%,
The wire diameter fluctuation was 5.8, and the wear resistance was 600 or more. Except that this composite monofilament was used as a spinning yarn, an imparting agent was applied in the same manner as in Example 9 to produce a monofilament and a woven fabric. No fluff or fibrillation occurred during the weaving process, and the quality was very high, with very little unevenness in the weave, and the printing characteristics were also very excellent.

[0052]

According to the present invention, a monofilament and a fabric (woven fabric) having excellent weaving properties, abrasion resistance and dimensional stability are provided.
Further, the woven fabric is extremely excellent as a screen gauze, has high weaving properties, high durability, has a good contour of the emulsion which is not irradiated and has a clear contour line, and has good printing characteristics such as ink loss. It will be excellent.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a processing apparatus that can be used when producing fibers used in the present invention.

[Explanation of symbols]

 A: Clear stand B: Oil agent deposition device C: Oil agent tank and oil agent pump D: Hot air generator for preliminary drying E: Hollow heater type heat treatment machine F: Goded roller G: Winder

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI D01F 6/62 306 D01F 6/62 306U 308 308 6/80 331 6/80 331 D03D 1/00 D03D 1/00 Z D06M 15 / 643 D06M 15/643 // D06M 101: 32

Claims (4)

[Claims] 1. A monofilament having a strength of 12 g / d or more and an elastic modulus of 300 g / d or more to which 1% by weight or more of a polysiloxane and / or a fluororesin is adhered. 2. A molten liquid crystalline polyester monofilament or para-aramid monofilament having a strength of 12 g / d or more and an elastic modulus of 300 g / d or more to which 1% by weight or more of a polysiloxane and / or a fluororesin is adhered. 3. A woven fabric comprising a monofilament having a strength of 12 g / d or more and an elastic modulus of 300 g / d or more to which 1% by weight or more of a polysiloxane and / or a fluorine-based resin is adhered. 4. A screen gauze made of a woven fabric using a monofilament having a strength of 12 g / d or more and an elastic modulus of 300 g / d or more to which 1% by weight or more of a polysiloxane and / or a fluororesin is adhered.