JPS58169540A - Weaving of screen shir - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weaving method for poly-F and chill screen shear, and the object thereof is to provide a screen shear of excellent quality with less generation of white powder scum during weaving.

Polyester monofilament and polyethylene terephthalate fibers have vague characteristics, so they have traditionally been used in screen shearing.In recent years, they have also expanded into the fields of electronics and high-end printing. Demand for higher strength, improved durability, etc. is increasing.

However, when weaving a screen shear using such polyester monofilament, white powder scum is likely to be generated, causing various problems. Problems caused by the generation of white powder scum are particularly common when weaving high-density screen shears of 250 mesh or more using polyester monofilaments with a fineness of 20 denier or less as warp threads.

This white powder scum is generated by repeated abrasion of the reed, and when using polyester monofilament with a fineness of more than 20 deniers, the reed (gap between the reeds and the cross-sectional diameter of the filament) is wide, so the abrasion is more likely to occur. The severity is mild and there are few examples. Moreover, since the fineness is high, no actual damage to the gray fabric due to the generated white powder scum is observed.

However, when polyester monofilament with a fineness of 20 deniers or less is used, the reed gap is usually smaller than the cross-sectional diameter of the filament, and the filament is repeatedly subjected to strong abrasion, resulting in significant surface damage and white powder scum. . Therefore, this white powder scum clogging causes warp breakage and warp streak spots on the gray fabric, seriously deteriorating both the quality and the unsightly efficiency. □ In order to solve this problem, Kanto Motoyama first developed a polyester 7/filament for screen shears with a breaking elongation of 35 to 60% ('l'?
No. 16948). 'When using this monofilament, it is possible to prevent the generation of white powder scum during screen shear weaving, but since a high elongation monofilament is used, the strength of the monofilament is inevitably low and the resulting screen shear is A new problem arose in that the tensile strength, elastic turning force, and durability of the material decreased. Furthermore, one of the inventors of the present invention proposed that at least three hemispherical and/or half-circular convex portions be formed on the fiber surface in order to eliminate the above-mentioned drawbacks.
We proposed a polyester monofilament (Japanese Patent Application No. 120676/1983) with a 0.0/100 fi"4.However, this method achieved the original goal of achieving a screen shear with high strength and less generation of JIl scratches and scum. Although it is possible to obtain monofilament yarn, the coefficient of friction between fibers decreases, the fiber becomes smooth due to inertia, it is difficult to spin or draw and wind up, and the twill comes off in the package.
Interruptions occur, such as the appearance of the rolls collapsing.

On the other hand, during weaving, non-reactive silicone resins such as dimethyl silicone and hydrogen silicone are commonly used to reduce the frictional resistance between fibers and gold Mt. In this case, the generation of white powder scum cannot be prevented.

In order to overcome the above drawbacks, the present inventors have made extensive studies to treat monofilament with a treatment agent mainly consisting of reactive silicone resin, to perform a crosslinking reaction, and to create an excellent smooth surface on the fiber surface. By forming a strong mesh-like film with a high molecular weight, there is no problem with winding up the package such as the twill coming off, and there is no problem with winding up the package. We have arrived at the present invention which can prevent the generation of white powder scum.

That is, the present invention provides a screen gloss characterized by using a polyester 7-point 1 piece having an extreme of 20 tenier or less, which is coated with a reactive silicone resin in an amount of 0.1 to 0.7 qb by weight. This is a weaving method.

In the present invention, the neck 5 reactive silicone 1N resin refers to an organo-silicone compound having an oxane bond (Si-0+), or
A mixture of at least one type of said compound and 8 compounds is subjected to a polymerization reaction at room temperature or heated MK to form a compound for the polymer lid, for example, a mixture of epoxysiloxane and 7-minosilane, epoxy Elementary mixing of siloxane and amine compounds? means. However, the state of the above compound or mixture is extremely unstable, and if left at room temperature, polymerization progresses over time and tends to gel, making stable operation difficult. If something falls down,
It is preferable to use a mixture with the compound ' of Japanese Patent Publication No. 48-17514 or a mixture with an aminosiloxane.

With this invention! T5 polyester 7 filament (Mo7 filament made of ethylene terephthalate) & main target. However, it is a monofilament made of a polyester having ethylene terephthalate as the main repeating unit and copolymerized and/or mixed with a small proportion (fi usually 20 molt or less) of W43 components other than prephthalic acid components and ethylene glycol components. Good too.

The degree of polymerization of the polynisol is suitably such that the limiting viscosity measured with an o-90 phenol solution at 35° C. is 0.5 or more, preferably 0.7 to 1.0.

In the present invention, the treatment agent applied to the polynisder monofilament may be any reactive silicone resin that can improve the fine surface and form a strong coating with excellent smoothness, as described above.
Although not limited to specific items, the following KI11
The processing agents mentioned above are preferred.

That is, a preferable treatment agent of the present invention is one whose main components are a specific 7-minosilane and a specific epoxysiloxane in a specific ratio, and the 7-minosilane, which is one of the main components, has the following properties: H(R')N-R "-at-(OR")s...-
It is expressed by the general formula .--tA. In the formula, R1 is hydrogen, a furkyl group having 1 to 4 carbon atoms, or an aryl group, and R
3 is an alkylene group with or without a side chain having 1 to 4 carbon atoms, R3 is an alkyl group having 1 to 4 carbon atoms,
In either case, if the number of carbon atoms is 5 or more, it is impossible to impart sufficient smoothness and elastic recovery.

An example of an excessive 7minosila/ is r-amylable pyrutriethoxysila 7: H, Ne, 1% 81 (OC*
Hs)s -F -7 Minobudipyrtrime xysilane: H, NC, Tori8i (0eHa)s, etc., but these VC@ are not defined -1
゜In addition, the other main component, epoxysiloxane, used in combination with the above aminosilane, is fO-8i) ...... (B-
1) Consisting of a structural unit (B-1) represented by the general formula R% and a structural unit (B-2) represented by the general formula 6 υ, and having a large molecular weight, smoothness.

0 Normally 2s' is preferable because it has a large effect of imparting elastic recovery properties.
The viscosity at C is 1000-10000G-1! /stokes, and those of 3,000 to 10,000 centistokes are preferable for tatami mats. Moreover, in the case of such a viscosity, the epoxy group in the above structural unit (B-2) is in the epoxysiloxane! Items that account for more than 100 yen by weight, ie, those with an epoxidation degree of 11 or more, are additional teeth. Note that R4 and RI in the structural unit (B-1) are furkyl groups such as methyl, ethyl, propyl, etc., and R4 and R1 may be the same or different. RI in the above structural unit (B-2) is methyl or ethyl.

is an alkyl group of pripylic, R is (cH,)j' (where j' is an integer of 2 to 5), and may have a tun substituent in any case. The terminal of the above epoxysiloxane is a) realkylsilyl group, human-xyfurkylsilyl group,
It may also be a silicon-free group. Furthermore, the epoxysiloxane may contain small amounts of other structural units.

The ratio of the above aminosilane and epoxysiloxane is 1 to 80 parts by weight of the latter to 1 weight of IIK of the former. ll1
K, 73 epoxysiloxane 5- to 1 weight of silane
A range of 18 parts by weight is preferred.

Any method may be used to attach the above-mentioned treatment agent to the polyester monofilament, and the timing may be either before or after stretching. Usually, the processing agent is made into an emulsion of 1 to 15 weight and applied by a dipping method, an oiling roller method, a Sudan method, or the like. It is sufficient that the amount of adhesion is approximately Q,1 -0.7 weight based on the silicone resin based on the weight of the fiber. When the processing agent is used in the form of an emulsion, an emulsifier, an antistatic agent, etc. can be added as necessary.

After applying the above-mentioned treatment agent, the fibers are heat-treated.
Therefore, the aminosiloxane and epoxysiloxane in the treatment agent can be formed into a network on the fiber surface, thereby forming a strong film on the fiber surface, which has better smoothness and elastic recovery. However, the weavability can be further improved.

Also, the heat treatment temperature varies depending on the heat treatment time, −
Although it cannot be determined generally, if the temperature is too low, it will take a long time and the effect will not be fully obtained (on the other hand, if the temperature is too high, the fiber tube will deteriorate. The mgE of the treatment should be lower than the melting point at 100° C. or higher.When the treatment temperature is relatively high, it is preferable to keep the treatment temperature within a time period in which the fiber material U does not deteriorate much.

Such a monofilament may be melt-spun as a multifilament and then split, or may be melt-spun as a monofilament from the beginning.

The above-mentioned polyester monofilament is a monofilament with a fineness of 20 deniers or more (J&), and young fruits are noticeable when monofilaments with a fineness of 5 to 15 deniers are used.

As mentioned above, if the fineness is greater than 20 denier, even conventional monofilament can be used without any harm.
It is not necessary to treat with monofilament reactive silicone resin as in the present invention.

In the present invention, the fineness is 20 denier or more,
Based on the weight of fibers with reactive silicone resin on the surface, Oa
The screen shear is woven using the t~0.7% by weight, which reduces the coefficient of dynamic friction of the °C monofilament against fibers and against metal, improves smoothness, The surface of the monofilament is less likely to be scraped off, and the generation of white powder scum during screen shear weaving is greatly reduced. Furthermore, conventional polyester 77 filament has high tensile strength.

In order to obtain a screen shear with good elastic recovery and durability, the strength of the monofilament was set to s, oII/d・or more, and the Young's modulus at the 80% portion was set to 60-140 hours. /j, it was impossible to prevent the generation of white powder scum during screen shear weaving, but when using monofilament with a reactive silicone resin coating formed on the surface as described above, the strength is 10 jl/do or more, the back Breaking strength at elongation curve: 80
The Young's modulus at the - position is 60 to 1L40 and the generation of white powder scum is prevented even at #/-, so it is an obstacle during screen shearing, and the screen has excellent tensile strength, elastic recovery, and durability. Shah is obtained.

Furthermore, the Young's modulus at the 80 inch position of the breaking strength on the loading curve is the tangent drawn to the loading curve at the position of the strength a' which is so% of the breaking strength a of the loading curve shown in the figure. , contact t
Based on 12.
It means Young's modulus determined from the formula 4 x s/d·×100.

gIF! L is 5.0 J/de or more, and this Young's modulus is 60
~240 kg/-1 preferably 100-120 yu/-
The screen shear woven using monofilament has improved tensile strength and durability, has a large elastic recovery force, and instantly returns to its original state after being deformed by rolling, making it clear and good. You can print and print.

With a strength of 5.0 Jil/d@ or more, the Young's modulus at the 80 inch position of the breaking strength in impact/extension is 6o-1.
The polyester filament which is 4okg/- is 35
A constant intrinsic viscosity of 0-9R phenol solution at 0.
5 or more, preferably 0.7 to 1.0 is melted, and after applying a treatment agent mainly composed of the above-mentioned reactive silicone resin, a polyester of soo to 1.0 is melted. It can be obtained by spinning at a spinning speed of about ao otx/min, stretching 3.4 to 4.9 times, and then heat setting at a temperature of 120 to 16 Q'C. If a straight stretching method is adopted in which the fiber is continuously stretched without winding after spinning, the stretching will be completed before the crosslinking reaction of the reactive silicone resin occurs on the fiber surface, so the silicone resin will improve the stretchability. is preferable because it is less likely to be inhibited.

As explained above, the polyester screen shear of the present invention dramatically reduces the generation of white powder scum during weaving, can prevent salmon thread breakage and warp streak spots on gray fabric, and has a tensile strength of 2.
It is of high quality with excellent elastic recovery and durability.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Examples 1 and 2. Comparative Examples 1 and 2 After melting polyethylene terephthalate with an intrinsic viscosity of o and s4 measured with an O-low phenol solution at 35°C, it was spun at a spinning speed of 100011/min and treated with various processing agents shown below. I later picked it up.

Processing agent A The processing agent epoxysiloxane consists of units, viscosity s, o o centistokes, epoxidation F! Both ends of L1 are -Si (CH
s)m, and the structure of 7minosilane is H,N-C
, H, ·81 (0Ct)ls)s.

Processing agent B Mineral oil 30. Ester25. A widely used lubricant consisting of 45 parts by weight of Tsukuda.

Processing Agent C: Same composition except that the epoxysiloxane and amino club of Processing Agent A were replaced with a non-reactive silicone resin, HiF' l=J diene silicone.゛Next, after stretching 4.27 times with a roller heated to 83°C, 0.0
Heat set for 3 seconds and wind at a speed of 600 IlZ.
A monofilament of 11de was obtained.

4 pieces each of monofilament! The characteristic value is number 11! It was as shown in

A portion of the obtained monofilament was used for the warp and weft to weave a plain weave of 300 meshes, and the resulting screen shear was scoured at 80°C for 20 minutes in a 0.6 i/l alkaline bath to a width of 101 m and 11°. The tear strength of a sample cut to a length of 50 m11 was measured using an Instron tensile tester at a heating speed of 5C1K/min. Table 2 shows the sweetfish.

Furthermore, among the characteristic values in Table 1, the interfiber friction coefficient μ
FF and the coefficient of friction between fibers and metal μFF were measured by the radar method at a speed of aoom/min. The sample was rubbed with a commercial reed at a reed speed of 140 strokes/min, and the time until white powder began to be observed with the naked eye was determined.

As is clear from the table, when monofilament treated with a treatment agent mainly composed of reactive silicone resin is used, screen shear and white powder scum generation during weaving are reduced, and tensile strength and elastic recovery are improved.

A screen jar with excellent durability can be obtained.

Example 3 Monofilaments were produced in the same manner as in Example 1, except that the amount of treatment agent A used in Example 1 was changed and the amount of reactive silicone resin was changed as shown in Table 3. , a screen shear was made and the results shown in Table 3.4 were obtained.

Table 3, 4. If the adhesion of surface treatment agent A is less than 1 layer, white powder scum generation during weaving cannot be prevented;
If the amount is 0.71 or more, treatment agent scum will be generated, resulting in a high yarn breakage rate during drawing, and warp spots on the greige will occur during fiber production, resulting in poor quality and a coating amount of O81 to 0. FuXt
Good results were obtained for S.

[Brief explanation of the drawing]

Claims (1)

[Scope of Claims] 1) A screen shear weaving method using polyester monofilament having a fineness of 2o denier or less coated with 0.1 to 0.7 layers of reactive silicone resin. 2) The reactive silicone resin has a general formula H(R')N-"R"-8i-(OR"), 7-silane represented by It consists of a structural unit represented by the formula C-0-8i-> and a structural unit represented by A method for weaving a screen shear according to claim 1, which contains as a main component Eposen-Shigxa 7 having a degree of chemical conversion of 1NltTo or more. 3) The breaking strength of the polyester monofilament is 5.
OJ//do or more, ao% of breaking strength at the stem elongation curve
The screen shear m weave according to claim 1 or 1, wherein the Young's modulus at the position is 60 to 240 kIP/-. 4) The screen shear J1 weaving method according to any one of claims 1 to 3, wherein the m degree is 5 to tS denier. S) Any one of claims 1 to 4, which is polyester or polyethylene terephthalate.
Screen shear weaving method on fi.