WO2005118926A1

WO2005118926A1 - Monofilament for screen silk gauze and screen silk gauze therefrom

Info

Publication number: WO2005118926A1
Application number: PCT/JP2004/014185
Authority: WO
Inventors: Yoshitomo Hara; Sunao Takahira
Original assignee: Kanebo, Ltd.; Kanebo Gohsen Limited
Priority date: 2004-06-03
Filing date: 2004-09-28
Publication date: 2005-12-15
Also published as: KR20070026562A; JP4958547B2; CN1985033A; JPWO2005118927A1; TWI370773B; CN100510209C; US20080045105A1; TW200609125A; US20110039466A1; KR101169111B1

Abstract

A monofilament for screen silk gauze being a core-sheath composite monofilament, comprising core portion (1), the core portion (1) constituted of fiber formation polymer (4) containing light absorption substance (3) capable of absorption of light of 350 to 450 nm wavelength, and sheath portion (2), the sheath portion (2) constituted of fiber formation polymer (5) not containing the light absorption substance (3), whose average reflectance of light of 350 to 450 nm wavelength is set for 15% or below. Thus, there is provided an excellent monofilament for screen silk gauze which is free from drop of monofilament strength, scum occurrence, wear of peripheral members such as a reed, ink release failure, etc., and which does not need any dyeing step to thereby avoid any excess cost. Furthermore, there is provided a screen silk gauze from the above monofilament.

Description

Specification

Monofilament for screen gauze and screen gauze using the same

Technical field

The present invention relates to a monofilament for screen gauze and a screen gauze using the same.

Background art

[0002] In screen printing and screen printing, screen gauze used to form a printed pattern is made by weaving monofilaments made of a fiber-forming polymer such as polyester or polyamide into a woven fabric such as a plain weave or a twill weave. Things are common.

[0003] Conventionally, a relatively large amount of titanium oxide has been blended into the monofilament constituting the screen gauze in order to prevent halation, and light during exposure has been diffused as much as possible by the titanium oxide. I have been. However, even when the above-mentioned monofilament containing titanium oxide is used, there is a problem that reflection of light in a visible light region is insufficient and halation cannot be completely prevented. In addition, since the surface of the titanium oxide-containing monofilament becomes uneven due to the protrusion of the titanium oxide particles, there is a problem that the printing is not clear due to poor ink separation during printing, and scum and the like due to shaving during weaving occur. There is also a problem that operability is poor.

[0004] Therefore, screen gauze containing as little titanium oxide as possible, using a monofilament containing an ultraviolet absorber and a yellow or red pigment (see Patent Document 1), or coloring or sheathing only the sheath portion There have been proposed ones using a core-sheath type monofilament which is dyed to impart light absorbency (see Patent Document 2).

Patent Document 1: Japanese Utility Model Publication No. 62-28567

Patent Document 2: JP-A-64-47591

Disclosure of the invention

Problems to be solved by the invention

[0005] However, in the case of Patent Document 1 described above, since the ultraviolet absorbent and the pigment are dispersed and contained in the entire monofilament, the strength of the monofilament as a yarn is reduced, and the yarn is woven during weaving. There is a problem that bulls easily occur. In addition, although not as high as conventional products containing a high proportion of titanium oxide, some irregularities occur on the surface of the monofilament, making it impossible to completely eliminate problems such as problems during weaving and ink separation during printing. There is.

[0006] On the other hand, in the case of Patent Document 2 described above, when an ultraviolet absorber, a pigment, or the like is kneaded in advance into the sheath portion, irregularities are formed on the monofilament surface by particles of the pigment or the like. There is a problem that it is still easy to occur. For example, when a pigment or the like is contained in the sheath component, unevenness of fineness may be caused to cause printing unevenness or the accuracy may be immediately reduced. In addition, it is described that pigments and the like can be applied via a dyeing process after weaving, but in this case, there is a problem that an extra process called a dyeing process is increased, and thus manufacturing costs are increased. . Further, for example, when a core-sheath structure is formed by combining polymers having different heat shrinkage ratios such as polyester and 6 nylon, there is a problem that physical properties such as monofilament strength are reduced by dyeing, and it becomes difficult to form a fabric.

[0007] The present invention has been made in view of such circumstances, and does not cause a decrease in the strength of the monofilament, the occurrence of scum, the wear of peripheral members such as the proof, the failure of ink detachment, and the like. It is an object of the present invention to provide an excellent monofilament for screen gauze and a screen gauze using the same, which do not require extra cost.

Means for solving the problem

[0008] In order to achieve the above object, the present invention relates to a core-sheath composite monofilament, which is formed from a fiber-forming polymer containing a light-absorbing substance having a light-absorbing property with a core force wavelength of 350 to 450 nm. The monofilament for screen gauze whose sheath portion is formed of a fiber-forming polymer not containing the above-mentioned light-absorbing substance and whose average reflectance to light having a wavelength of 350 to 450 nm is set to 15% or less is used as the first filament. The summary of the

[0009] In addition, the present invention is particularly directed to a monofilament for screen gauze in which the content of the light absorbing substance in the core is set to 0.3 to 2.0% by weight based on the entire core. Among them, a monofilament for a screen gauze having a core-sheath cross-sectional area ratio force of 40: 60-90: 10, which is the third summary, among them.

[0010] Furthermore, the present invention, among them, particularly, the above-mentioned core-sheath type composite monofilament Monofilament for screen gauze set with elongation at break of 20-30% and breaking strength of 5.5 cNZdtex or more is the fourth gist.

[0011] In the fifth aspect of the present invention, a screen gauze configured using the monofilament for screen gauze according to any one of the first to fourth aspects is provided.

The invention's effect

That is, the monofilament for screen gauze of the present invention is a special core-sheath composite monofilament containing a light-absorbing substance in the core, and has an average reflectance of 15% or less for light having a wavelength of 350 to 450 nm. Because it is set, when a screen gauze is used, halation does not occur and a clear printed pattern can be obtained. In addition, since the sheath portion having irregularities on the surface of the monofilament maintains a certain strength, the strength of the monofilament decreases.Spinning occurs. Weaving Excellent in operability. The advantage is that the dyeing process is unnecessary and no extra cost is required.

[0013] In the monofilament for screen gauze of the present invention, in particular, the content of the light absorbing substance in the core of the monofilament is set to 0.3 to 2.0% by weight based on the entire core. Those that have sufficient yarn strength and have excellent anti-halation effects.

[0014] In particular, the core-sheath type composite monofilament has a core-sheath cross-sectional area ratio of 40: 60-90.

: 10 has more yarn strength, and has an excellent antihalation effect.

[0015] Further, particularly, the core-sheath type composite monofilament has a breaking elongation of 20-30% and a breaking strength of 5%.

If it is set to 5 cN / dtex or more, when it is used as a screen gauze, it will have optimal strength and can be used well over a long period.

[0016] Since the screen gauze of the present invention is configured using the special monofilament for screen gauze, a clear printed pattern can be obtained without causing halation. Brief Description of Drawings

FIG. 1 is a schematic explanatory view showing one embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a color of a dye and a reflectance. BEST MODE FOR CARRYING OUT THE INVENTION

Next, the best mode for carrying out the present invention will be described.

FIG. 1 shows a monofilament for screen gauze according to an embodiment of the present invention.

This monofilament is a core-sheath composite monofilament having a core 1 and a sheath 2, and the core 1 is a fiber-forming polymer containing a light-absorbing substance 3 having a light absorption characteristic of a wavelength of 350 to 450 nm. It is formed by four.

The light-absorbing substance 3 is not particularly limited as long as it has a light-absorbing property at a wavelength of 350 to 450 nm. For example, titanium oxide, zinc oxide, calcium carbonate, magnesium carbonate, silica, Inorganic pigments such as metal oxides such as alumina, talc, chromate, ferrocyanide, various metal sulfates, sulfides, selenides, phosphates, phthalocyanines, quinacridones, isoindolinones, perinones, Organic pigments such as dioxazine, benzene (monoazo, disazo, etc.), heterocyclic azo (thiazoleazo, benzothiazo mononorazo, quinolinazo, pyridineazo, imidazonoreazo, thiofenazo, etc.), anthraquinone, condensation ( (Quinophthaline, styryl, coumarin, etc.) indigoid dye, triphenylmethane dye, xanthene Dyes, dyes such as alizarin dyes, ataridine dyes, cyanine dyes, etc .; or carbon black or metal powders such as gold, silver, copper, platinum, palladium, nickele, aluminum, silicon, brass, or alloy powders, silicon nitride, Colored fillers in which pigments or dyes are dispersed in fine particles of ceramics, such as boron nitride, titanium nitride, aluminum nitride, silicon carbide, tungsten carbide, strontium titanate, barium titanate, and dinoreconium titanate, or fine particles formed of organic compounds. First class can be given. These may be used alone or in combination of two or more.

The number average particle diameter of the powder or particles used as the light absorbing substance 3 is preferably 0.01 μ 01η or more and 10 / im or less, more preferably 0.05 μm or more and 2 μm or less. Desirable. Within this range, yarn unevenness is unlikely to occur. That is, if the light-absorbing substance 3 is too large, the strength of the yarn will be reduced, causing yarn unevenness. If too small, the light-absorbing substance 3 will tend to condense and solidify, causing yarn unevenness. Among them, it is preferable to use a disperse dye which is hardly soluble in water, from the viewpoint of the spinning operability of polyester.

[0022] Representative disperse dyes include Dianix series dyes manufactured by Dystar and Sumika Chemtetsu. Sumikaron series dyes manufactured by K, Kayalon Polyester series dyes and Kayalon Microester series dyes, Kayaset series dyes manufactured by Nippon Kayaku, Miketon series and Palanil series dyes manufactured by Mitsui BASF, TD series dyes manufactured by Daito Chemical Co., Ltd. Preferred are Kiwalon Polyester series dyes manufactured by Kiwa Chemical Industry Co., Ltd., Terasil series dyes manufactured by Ciba Charity Chemicals, Foron series dyes manufactured by Clariant, and Diaresin series manufactured by Mitsubishi Kasei Hextone clay. These disperse dyes can be used alone or in combination.

Suitable commercially available dyes include, as yellow dyes, Diares in Yellow H2G manufactured by Mitsubishi Kasei Hextone, Nylosan Yellow N-5GL manufactured by OG CORPORATION, and the like. In addition, Dianix Red AC-E manufactured by Dystar can be used as a red dye, and Dianix Blue AC-E manufactured by Dystar can be used as a blue dye.

[0024] Incidentally, it is known that the dyes have different light absorption characteristics for each color. For example, typical colors are black (〇N Corp., Nylosan Black F-ML) and red (〇 G Corporation (Nylosan Red F—RL200), blue (OG Corporation, Nylosan Blue), yellow (OG Corporation, Nylosan Yellow N-5GL), green (OG Corporation, Nylosan Green F—BL) ), A core-sheath composite monofilament was prepared according to Example 1 described later, and the light absorption characteristics were measured by the following measurement method.The reflectance was as shown in Fig. 2. Was. Similarly, a core-sheath composite monofilament (white) containing 1.0% by weight of titanium oxide in the core portion was prepared, and the same identification was performed. Here, in FIG. 2, 11 indicates black, 12 indicates red, 13 indicates blue, 14 indicates yellow, 15 indicates green, and 16 indicates white light absorption characteristics.

[Method of Measuring Light Absorption Characteristics]

Using a 1-piece knitting machine (MODEL CR-B) manufactured by Koike Seisakusho Co., Ltd., the tube was knitted into 24 cylinders, Z2.54 cm, and 34 courses / 2.54 cm. As a stack), it was mounted on a 3cm x 3cm measuring holder, and the reflectance in the wavelength range of 200-600 nm was measured using a Shimadzu UV-3101PC spectrophotometer for 5n. It was measured in m.

According to FIG. 2 described above, red, yellow, green, and black dyes having low reflectance and transmittance in the wavelength range of 350 to 450 nm are suitable for use as the light absorbing substance 3 of the present invention. I can help you.

On the other hand, as the fiber-forming polymer 4 containing the light-absorbing substance 3, any one may be used as long as it is conventionally used in the production of monofilaments. For example, polyolefins such as polyethylene and polypropylene Or modified polyamides containing these as main components, polyamides such as nylon 6, nylon 66, nylon 10, nylon 12, or modified polyamide copolymers containing these as main components, polyethylene terephthalate, polyethylene terephthalate, poly Examples include polyesters such as tetraethylene terephthalate and polyethylene naphthalate; aliphatic polyesters such as polylactic acid and polyglycolic acid; and modified polyester copolymers containing these as main components. Among them, polyesters are preferred in terms of dimensional stability and strength.

[0028] The content ratio of the light-absorbing substance 3 to the fiber-forming polymer 4 depends on the type of the light-absorbing substance 3 and the cross-sectional area ratio of the core-sheath ratio. It is preferable to set the amount to 3 to 2.0% by weight, particularly to 0.8 to 1.5% by weight. In other words, if the content is less than 0.3% by weight, halation may occur due to the small light absorption effect of the light absorbing substance 3, and if it exceeds 2.0% by weight, the obtained monofilament becomes brittle, and This is because it may not be possible to tension the fabric with tension.

[0029] The content ratio of the light-absorbing substance in the whole fiber is preferably set to 0.1 to 1.8% by weight, and more preferably to 0.4 to 1.4% by weight, from the viewpoint of the effect. is there.

The sheath 2 (returning to FIG. 1) does not contain the light absorbing substance 3 and is formed of an appropriate fiber-forming polymer 5. As with the fiber-forming polymer 4 used in the core 1, any of those conventionally used in the production of monofilaments may be used, for example, polyolefins such as polyethylene and polypropylene, or these are mainly used. Polyamides such as modified polyolefin, nylon 6, nylon 66, nylon 10, nylon 12, etc., or modified polyamide copolymers containing these as main components, polyesters such as polyethylene terephthalate, polybutylene terephthalate, polytetraethylene terephthalate, etc. Ma Or modified polyester copolymers containing these as main components. Above all, polyamide is preferable in that the yarn is less scraped than the polyamide.

[0031] The cross-sectional area ratio of the core 1 and the sheath 2 is not particularly limited as long as the core-sheath type composite monofilament can be spun, but usually, the cross-sectional area of the core 1: the sheath 2 It is preferable to set the cross section of the bearing to a ratio of 40: 60-90: 10, especially a ratio of 40: 60-70: 30. In other words, if the ratio of the cross-sectional area of the core 1 is too small, the light absorption effect is exhibited, and there is a possibility that halation may occur. Conversely, if the ratio of the cross-sectional area of the core 1 is too large, the spinning operability may be reduced. This is because there is a risk that the printing performance will deteriorate and that the printing performance will decrease due to unevenness in the fiber diameter.

[0032] The fineness of the core-sheath type composite monofilament of the present invention can be appropriately set in accordance with the size of the screen gauze, the required resolution, and the like. It is suitable. In other words, if the fineness is smaller than 4 dtex, weaving may be difficult.On the other hand, if the fineness is larger than 30 dtex, spinning operability may be deteriorated, and a dense high mesh structure cannot be formed. There is a possibility that the significance of the present invention of obtaining clear image quality may be impaired.

[0033] Furthermore, in order to use the core-sheath type composite monofilament of the present invention as a screen gauze, it is desirable that the elongation at break is set to 20 to 30% and the breaking strength is set to 5.5 cN / dtex or more. That is, if the above-mentioned physical properties are not provided, it is not possible to perform gauging with a high tension, and there is a possibility that printing accuracy cannot be improved.

[0034] The core-sheath type composite monofilament of the present invention can contain titanium oxide, similarly to the conventional monofilament for screen gauze. However, in order to ensure smooth weaving and ink releasability, it is desirable that titanium oxide be contained not in the sheath 2 but in the core 1. When titanium oxide is used, its content is preferably set to 1% by weight or less based on the entire core 1.

[0035] The core-sheath composite monofilament of the present invention can be obtained, for example, as follows.

That is, first, for forming a core, a fiber-forming polymer chip such as polyester is vacuum-dried, and the dried chip is introduced into a mixing means such as a twin-screw kneader. Then, a light-absorbing substance such as a yellow dye is introduced into the mixing means at a predetermined ratio. And enough of both A mixed chip is obtained by kneading and extruding. On the other hand, a fiber-forming polymer chip such as polyamide is prepared for forming the sheath. Then, by using the core-sheath composite monofilament melt spinneret and the above two types of chips and performing melt spinning according to a usual method, the intended core-sheath composite monofilament can be obtained.

When a polyester polymer chip is used as the chip for forming the core, it is preferable to knead a chip having a water content of 20 ppm or less. When a polyamide polymer chip is used as the chip for forming the sheath, it is preferable to knead the chip with a water content of 100 ppm or less. As described above, kneading chips having a moisture content of a certain value or less makes spinning operability more preferable.

[0037] In order to obtain sufficient strength of the obtained core-in-sheath type composite monofilament, it is desirable to set the melt viscosity of the fiber-forming polymer chip serving as the core to be higher than usual. . For example, it is preferable to set the intrinsic viscosity to 0.60 to 0.80.

[0038] The screen gauze of the present invention can be obtained by weaving and gauging the core-sheath composite monofilament obtained as described above by a usual method. The weaving conditions are not particularly limited.

[0039] The screen gauze thus obtained has good light absorption characteristics with an average reflectance of 15% or less for light having a wavelength of 350 to 450 nm, despite being obtained at low cost, and causes halation. In addition, ink separation is good, and a clear print pattern can be formed. The average reflectance for the light having the wavelength of 350 to 450 nm is preferably 10% or less, which is preferable from the viewpoint of preventing power halation.

Example

Next, examples of the present invention will be described together with comparative examples.

Example 1

Homo PET (polyester) chips having an intrinsic viscosity of 0.66 were dried under vacuum by Karl Fischer's moisture measurement method until the chips had a water content of 20 ppm. The mixture was charged into a twin-screw kneader under a nitrogen purge, and kneaded with a yellow dye (Diaresin Yellow H2G, manufactured by Mitsubishi Kasei Heist Co., Ltd.) so as to be 1.0% by weight. During kneading, kneading and extrusion were performed while evacuation was performed at 600 mmHg. The intrinsic viscosity of the kneaded PET was 0.64. [0042] Then, using the obtained yellow dye-containing PET chip as a core component, 6 nylon chips as a sheath component, and using a core-sheath type composite monofilament melt spinning die, a core-sheath cross-sectional area ratio of 50:50, fineness A 13 dtex core-sheath composite monofilament was melt spun.

[Examples 2-5, Comparative Example 1]

The content of the yellow dye in the core was changed as shown in Table 1 below. Otherwise in the same manner as in Example 1, a core-sheath composite monofilament was obtained.

For these core-sheath composite monofilaments, spinning operability, average reflectance in a wavelength range of 350 to 450 nm, breaking strength, weaving property, screen gauging property, and printing performance were evaluated by the following methods. Was measured or evaluated according to The results are shown in Table 1 below.

[Spinning operability]

Continuous spinning was performed for one day using an actual machine, and the extrusion stability and yield of the core polymer and the sheath polymer during that time and the stability of the core-sheath shape were observed and evaluated. All the items were stable and very good, very good (◎), and the items of レ and deviation were almost stable and good, good (〇). Those which were present were evaluated as defective (X).

[Average reflectance]

The core-sheath composite monofilament was knitted by Koike Seisakusho's 1-neck knitting machine (MODEL CR-B) into a tubular knitting machine under the conditions of 24 pipes / 2.54 cm, 34 pipes and Z2.5.54 cm. Is folded in two (eight stacked) and mounted on a 3cm x 3cm measurement holder, and the reflectance in the wavelength range of 350-450nm is measured in 5nm increments using a Shimadzu UV-3101PC spectrophotometer. The measurements were taken and the average was determined.

[Rupture strength]

In accordance with the JIS L 1013 method, using an AGS-1 KNG autograph tensile tester manufactured by Shimadzu Corporation, the sample length was 20 cm and the low-speed tensile speed was 20 cm / min.

[Wovenability]

Observe and evaluate the frequency of thread breakage and scum when weaving 300 mesh screen gauze with a weaving machine (G-6200) manufactured by Suruza Inc. using core-sheath type composite monofilament. did. Then, the weaving length at the time when the normal weaving could not be maintained and the vehicle had to be stopped was measured. If the weaving length was 1000 m or more, it was excellent (◎), if it was 500 m or more, good (良好), and if it was less than 500 m, it was poor (X).

[Screen gauze properties]

A 300-mesh gauze fabric was stretched on a gauze frame with a tension of 35N, and it was observed whether the screen gauze ruptured. The ruptured specimen was determined to be defective (X), while the ruptured specimen was not ruptured. And, when it was not ruptured by stretching it with a tension of 40N, it was evaluated as good (〇) when it was stretched and ruptured with a tension of 45N, and very good (◎) when it did not rupture. did.

[Printing performance]

Diazo resin type photosensitive resin is applied in a thickness of 10-11 μm on a screen gauze made of 300-mesh gauze fabric on a 320 mm X 205 mm gauze with 35 N tension, with a line width of 400 μm and a pitch of 400 μm. A photomask having a stripe pattern of μΐη was covered. Similarly, a photomask having a stripe pattern with a line width of 200 μm and a pitch of 200 μm was covered. After that, two types of printing plates were prepared by appropriate exposure and washing with water. Using these, 100 sheets were continuously printed, and the state of the image was photographed with a microscope at 400 × and observed. When halation occurs, the curing of the photosensitive resin is disturbed, and the stripe pattern becomes uneven or uneven in thickness. Therefore, evaluation was made based on the following criteria. Excellent (◎): The stripe pattern has no unevenness or uneven thickness.

Good (〇): Disturbed curing of the photosensitive resin, and several or a few irregularities and uneven thickness in the stripe pattern.

Defective (X): Disturbed curing of the photosensitive resin, resulting in marked unevenness and thickness in the stripe pattern.

Those with SE.

Impossible (1): Screen gauze was torn during gauze and printing performance could not be evaluated.

[Table 1] Example of application

1 2 3 4 5 1 Includes green dye in core

Ratio (% by weight) 1.0 0.1 0.3 2. 0 3, 0 Spinning operability Ο ο 0: O HI 0 Average reflectance 4.9.14.8, 14.3.4.0 48.7 Breaking strength (cN ¾tex) 5. 8 6. 3 6. 1 5. 5 5. 2. 6. Weaving Ο ο ο 0 O 0 value Sailing property © ◎ © O Δ ◎ Printing 4 m μm pitch

[Comparative Example 2]

A 6 nylon chip having a relative viscosity of 2.5 was vacuum dried by Karl Fischer's moisture measurement method until the chip moisture became 500 ppm. This was charged into a twin-screw kneader under a nitrogen purge, and kneaded with a yellow dye (Diaresin Yellow H2G, manufactured by Mitsubishi Kasei Heist Co., Ltd.) to a weight ratio of 1.0%. During kneading, kneading and extrusion were performed while evacuation was performed at 600 mmHg. The relative viscosity of kneaded 6 nylon was 2.6.

Using the obtained nylon dye-containing 6 nylon chip as a sheath component and containing no dye having an intrinsic viscosity of 0.66, PET as a core component, using a core-sheath type composite monofilament melt spinning die, A core-sheath composite monofilament having a core-sheath cross-sectional area ratio of 50:50 and a fineness of 13 dtex was melt-spun.

[Comparative Example 3]

A 6-nylon chip containing a yellow dye similar to that in Comparative Example 2 was used, and a monofilament with a fineness of 13 dtex having a round cross-section instead of a core-sheath type was melt-spun.

[Examples 6 and 7]

A dye using a red dye (Dianix Red AC-E, manufactured by Dystar) instead of the yellow dye of Example 1 (Example 6), and a green dye (Nylosan Gr, manufactured by OG CORPORATION) een F-BL) (Example 7).

[0056] In the same manner as described above, spinning operability, average reflectance, breaking strength, and weaving properties are described.

The screen gauze was measured or evaluated for its stretchability and printing performance. The results are shown in Table 2 below.

[Table 2]

[Examples 8-12]

The core-sheath cross-sectional area ratio was changed as shown in Table 3 below. Otherwise, in the same manner as in Example 1, a core-sheath composite monofilament was obtained. For these, spinning operability, average reflectance, breaking strength, weaving, screen gauging, and printing performance were measured or evaluated in the same manner as described above. The results are shown in Table 3 below.

[Table 3] Example

8 9 1 0 1 1 1 2 Core / sheath cross-sectional area ratio (core: sheath) 40:60 70:30 90:10 10 95: 5

Weight (weight 0.3 0.4 Q. 7 0.95 Spinning operability ◎ © @ 〇評 Average reflectance (%) ID. 7 5. 8 4. 8 4. 4 4. 3 cN 'dtex) 6.1 5.9 5.T 5.5.5.4 Weaving ® ◎ ◎ ◎ 〇 Value Stiffness ◎ © △

2 0 0 // m pitch Q ◎ O 〇

[Comparative Example 4]

A core / sheath composite monofilament was obtained in the same manner as in Example 1 except that the yellow dye was not added, and this was knitted into a tubular knit. The tubular knitted by weight with respect to the yellow dye (〇_G Corpor ATION Co., Nylosan Yellow N-5GL) 1. 0 weight ^_0/0, in a staining solution was added 1 by weight% sulfuric acid Anmoniumu, the tubular knitted fabric The mixture was immersed, heated to a boiling state in 30 minutes while stirring so as to adsorb 0.5% by weight of the dye, and then kept at a temperature of 95 ° C. for 25 minutes. Then, the tubular knitted fabric was taken out of the dyeing solution, washed with water, and air-dried. The weight of the tubular knitted fabric before and after dyeing was increased by 0.5% by weight.

[0061] The tubular knitted fabric after the above dyeing was unwound, and the breaking strength of the monofilament was measured in the same manner as described above, and it was 5. OcN / dtex. The average reflectance of this tubular knitted fabric was measured in the same manner as described above, and was 6.2%. The monofilament was used to weave a 300-mesh gauze fabric, and the screen gauze ruptured due to the force S that attempted to stretch the gauze frame on the gauze frame with a tension of 35N, and insufficient filament strength.

Industrial applicability

[0062] As described above, the monofilament for screen gauze of the present invention has high accuracy and good operability. It is suitable for use in screen gauze that requires printing performance.

Claims

The scope of the claims

[1] A core-sheath type composite monofilament, wherein the core is formed of a fiber-forming polymer containing a light-absorbing substance having a light-absorbing property of a wavelength of 350 to 450 nm, and the sheath is formed of the light-absorbing substance. A monofilament for screen gauze, which is formed of a fiber-forming polymer not containing, and has an average reflectance of 15% or less for light having a wavelength of 350 to 450 nm.

2. The monofilament for screen gauze according to claim 1, wherein the content ratio of the light absorbing substance in the core portion is set to 0.3 to 2.0% by weight based on the entire core portion.

[3] The monofilament for screen gauze according to claim 1 or 2, wherein the core-sheath composite monofilament has a core-sheath cross-sectional area ratio of 40:60 to 90:10.

[4] The monofilament for screen gauze according to claim 1 or 2, wherein the core-sheath type composite monofilament is set to a breaking elongation of 20 to 30% and a breaking strength of 5.5 cN / dtex or more.

[5] A screen gauze, comprising the screen gauze monofilament according to claim 1 or 2.