JP5051675B1 - Friction false twist disc - Google Patents

Abstract

The present invention relates to a false twisting device for a drawing and false twisting machine, and more specifically relates to a frictional false twisting disk for a drawing and false twisting machine such that the frictional false twisting disk has superior durability for twisting a thread shaped body known as POY, which is formed from multiple continuous filaments such as polyester or nylon, by the POY coming into contact directly with the peripheral surface of the disk. This frictional false twisting disk is used in a false twisting device for a drawing and false twisting machine; the frictional false twisting disk is characterized by being formed from a rubber material in which hydrogenated nitrile rubber with 17 - 44% by weight bound acrylonitrile as a frictional false twisting material has been peroxide vulcanized, by the rubber hardness of the peroxide vulcanized rubber material at 25°C as measured by a method for which the basis is JIS K6253 being a JIS-A hardness of 65 - 95, and by viscoelastic component · tan delta as measured at an atmospheric temperature of 60°C and frequency of 60 Hz by a tensile vibration test system, for which the basis is JIS K7244-4 (ISO6721-4), being 0.15 or less.

Description

  The present invention relates to a false twisting device for a drawing false twisting machine used in the textile industry. More specifically, the present invention relates to a pre-oriented yarn (hereinafter referred to as POY) composed of a large number of continuous filaments such as polyester or nylon. .) Relates to a friction false twist type false twist disk of a drawing false twisting machine for twisting the POY by directly contacting the outer peripheral surface of the disk with a filamentous material.

As a method for twisting a filamentous body called POY raw yarn, a method of bringing a plurality of rotating friction disks into contact with POY has been conventionally known. In this method, as shown in FIG. 1, a plurality of rotating friction disks (1) are used as one unit, a device in which a plurality of units are arranged is prepared, and POY (2) is moved between these units at high speed. By running, the POY comes into contact with the disk surface (7) of the unit, is rotated, false twisted and stretched. Since the rotating friction disk surface is in direct contact with the POY yarn, the disk surface is worn and the surface-like body changes with time. This change is also affected by the degree of false twist and the surface condition of the POY.
For this reason, there has been a lot of research on materials with high twisting force that make up the contact surface of the disk surface with POY, but most of the research is on materials related to either ceramic or polyurethane rubber. Research on polyurethane-based rubber compositions has been promoted since rubbers with particularly high hardness and high elasticity can be obtained (Non-patent Documents 1 and 2 and Patent Document 1).

FIG. 7 shows a typical structure of a recent high-speed drawing false twister.
The POY yarn (10) made of polyester filament or nylon filament is heated and softened by the first heater (12) at a high speed of about 600 m to 1200 m per minute, and the first softening yarn is stabilized by the cooling plate (13) while stabilizing the softness. Untwisting work after applying a constant twist with the false twisting device (14) while being stretched between the gripping part (11) and the second gripping part (15) in the range of about 1.5 times to 1.9. After fixing the twist in the opposite reverse direction and stabilizing the twist again with the second heater (16), the fixed bulky POY is wound around the winding bobbin (19) made of paper tube. It has a structure to take.
At this time, the temperature of the yarn contact surface of the friction portion (7) of the false twist disk of the false twist device (14) is always 60 ° C to 80 ° C in order to contact with the constant high temperature POY yarn after passing through the cooling plate (13). A friction false twisted member having a physical property that is sufficiently high within this temperature range is required.

In recent years, the twisting speed of the drawing false twisting machine has been further increased, and the main type is a machine that works at a speed of 1000 m / min or more. Therefore, the friction used for drawing false twisting of polyester POY. The false twisted disk is required to have a performance that can be used for a long period of time. In consideration of economy, only a rubber material having high hardness, high elasticity, and wear resistance can be used.
As a rubber-like elastic body with these characteristics, only urethane rubber can be selected as the current elastomer material, so most users use polyurethane discs for the friction false twisting members of drawing false twisting machines that process polyester POY. This is the current situation.

However, many polyurethane rubber materials have poor heat resistance as they are easily softened even when heated to about 120 ° C. In order to further improve heat resistance and wear resistance, a friction false twisted disk made of polyurethane rubber is used. Research has been actively conducted, and many patent applications relating to this matter are also found (Patent Documents 2 to 6).
Among them, for example, a friction false twist disk using polyurethane whose polyester component is limited to polycarbonate (Patent Document 5), polycarbonate is used as the polyester component, and further, paraphenylene diisocyanate (PPDI) is used as the diisocyanate component. A typical example is a friction false twist disk obtained by molding urethane rubber (Patent Document 6). The latter polyurethane rubber friction false twist disk is considered to have the best heat resistance and oil resistance at present.

Certainly, these polyurethane rubbers are superior in heat resistance, oil resistance, hydrolysis resistance, etc. compared to conventional polyurethane rubbers molded from adipate esters, and false twisting of false twisting machines using this polyurethane rubber. Although the disk for apparatus can also be called the disk excellent in those performances, heat resistance may still be insufficient depending on the use conditions of a drawing false twister.
The reason lies in the structure of a high-speed drawing false twister as is well known.
That is, as shown in FIG. 7, an example of the case where the polyester POY is stretched false twisted will be described below.

For example, a polyester filament raw material POY (2) made of 135d / 36f with 36 DPF 3.75d is supplied to the first feed (11) controlled at a constant speed of 650 m / min, and then 180 ° C. to 210 ° C. The POY is heated and plasticized to the vicinity of the softening point of the polyester through the first heater (23) heated to about ° C.
Subsequently, in the cooling zone called the cooling plate (13), the first feed and the second feed (with the plasticized state being continuously quenched so that the inside of the POY becomes uniform around 100 ° C. The POY (2) is stretched 1.8 times due to the speed difference so that the POY (2) becomes 75 d / 48f between the first feed and the speed of 1170 m / min (approximately 1.8 times the first feed).
The POY (2) that has been stretched and softened to a high temperature plasticized state enters a false twisting device (14) having a polyurethane false twist disk, and the POY is the surface of the yarn contacting the false twist disk (1) in FIG. It is a mechanism in which friction and twist are applied between (7) in FIGS.

The drawing false twisting machine is usually stopped every few months to clean the heater and the like, but since it is operated continuously for 24 hours other than that, the surface of the polyurethane rubber as the false twisting member is constantly 80 hours long. Since these polyurethane rubbers are in continuous contact with POY (2) in a high temperature state around 0 ° C. or higher, and these polyurethane rubbers have high heat insulating properties, the rubber surface is considerably heated due to a heat storage phenomenon.
For this reason, the strength of polyurethane rubber gradually decreases, and there are cases where it partially deteriorates and wears. Therefore, in order to extend the life of polyurethane false twisted disks, research and development of polyurethane materials with better heat resistance has been conducted. Has been done.
However, as long as polyurethane rubber is used as the friction false twisting member, considering the structure of the high-speed drawing false twisting machine as described above, it is inevitable that the heat resistance has its limit and the product life may be shortened. That is.

In addition to heat resistance, polyurethane disks have a major drawback in that the twisting force is likely to change depending on the operating ambient temperature. Specifically, the twisting force increases as the surface temperature of the polyurethane disk increases. On the contrary, when the surface temperature of the polyurethane disk is low, the twisting force becomes small, and the twisting force is greatly affected by the temperature change.
More specifically, even if the respective yarn tensions, T1 and T2 in FIG. 7 are adjusted within the target specification of the drawn yarn at the start of operation, for example, at a room temperature as low as about 15 ° C., For example, when the temperature rises to 25 ° C., the twisting force of the polyurethane disk increases, T2 decreases, and the outer diameter of winding (18) in the figure increases, which may result in non-standard quality. Conversely, after adjusting the twisting tension T1 and the untwisting tension T2 in FIG. 7 within the intended standard of the drawn yarn at 25 ° C., when the temperature drops to 15 ° C., for example, the twisting force of the polyurethane disk is reduced. If the untwisting tension T2 decreases and becomes severe, and if it is severe, the paper tube (19) that winds up the stretched POY of FIG. There is also.
This phenomenon has a great effect when operating in an area where the temperature difference between daytime and morning and evening is large, and immediate improvement is required.

For this reason, when using polyurethane disks, it is necessary to select a false twisted disk made of a material whose influence on twisting force due to temperature changes is as small as possible, and at the same time, air conditioning to keep the working environment at a constant temperature is required. In addition to the equipment costs for the operation, a large amount of electric power has been required during operation.
For these reasons, some users of friction false twist disk members have given up the use of polyurethane disks that have problems with heat resistance, and the other material is the friction false twist disk of the drawing false twister from the initial stage of development. There are many users who use ceramics with good heat resistance and have been aiming to improve their functionality, and many patents relating to these have been filed (Patent Document 7).
However, since the ceramic disk is twisted by mechanically hooking the POY on the uneven disk surface, the problem of the so-called tenness reduction due to fiber breakage is a problem in the case of false twisting of nylon POY where the fiber is soft. In the case of polyester POY, which has few fibers, even if it is devised in various ways, it is inevitable that scratches will eventually be made during the twisting operation that comes into contact with the disk surface, and the strength of the processed POY will inevitably decrease. There is a serious drawback.

Further, there is a problem that a lot of scraped POY called snow (white powder) generated by friction between the surface of the POY and the hard ceramic disk is generated, and if the POY traveling speed is increased, it becomes slippery and high speed machining cannot be performed. . In addition, ceramic discs are currently considered to be economically disadvantageous because of their high manufacturing costs per unit.
For this reason, there was an example (Patent Document 8) where the edge of the yarn contact surface with the POY of the ceramic disk was rounded to prevent POY yarn breakage, but the current working yarn speed was 1000 m / min. In high-speed machining, the twisting force that mechanically hooks the POY is reduced, or several of them are cut when mechanically hooked, so that sufficient twisting at a practical level becomes insufficient. After all, it seems that there are few examples in which a ceramic disk is employed in the drawing false twisting of polyester POY.
As described above, a number of patent applications have been proposed, and it has been examined whether there are various friction false twist members other than polyurethane rubber and ceramic, but in reality, in the case of stretch false twist processing of polyester POY Even today, polyurethane rubber friction false twist disks are the mainstay, and it can be said that other friction false twist members are hardly employed.

JP 60-9137 A JP 63-28924 A JP 59-157338 A JP-A-55-103328 JP-A-6-17331 JP-A-6-240528 JP-A-55-76127 Japanese Patent No. 3329622

"Filament processing technical manual (first volume), page 161, 7.12 Friction straight twist mechanism false twisting machine" (issued by the Japan Textile Machinery Society, May 15, 1976) "Filament processing technology manual (second volume), p. 125, 4.1.2 Friction straight twist type DTY machine" (issued by the Japan Textile Machinery Society, May 15, 1976)

Therefore, the object of the present invention is to improve heat resistance and aging resistance compared to conventional polyurethane rubber friction false twisted disks, and to endure by hydrolysis even when used under severe conditions of high temperature and high humidity. It is an object of the present invention to provide a friction disk for a false twisting machine of a friction false twisting type false twisting machine that does not have a decrease in life.
Compared with polyurethane friction false twist disks, the change in twisting force is less affected by the operating temperature atmosphere, and high quality POY processing can be performed without adjusting the temperature. Providing friction discs for false twisting devices of friction false twisting-type drawing false twisting machines that can reduce power costs and have good oil resistance without swelling the rubber surface even with oils contained in POY yarn There is to do.
Another object of the present invention is to provide a friction disk for a false twisting device of a stretching false twisting machine of an innovative friction false twisting method having a long life that is less likely to cause yarn breakage during use as compared with a ceramic disk.

Then, this invention is proposed in order to achieve the said objective, and makes the content as the following (1)-(3) the summary.
(1) A friction false twist disk used in a false twist device of a drawing false twister, wherein the friction false twist part is a rubber member obtained by peroxide vulcanization of 17 to 44% by weight of bonded acrylonitrile. The rubber hardness of the peroxide vulcanized rubber member is 65 to 95 in terms of JIS-A hardness according to JIS K 6253, and the JIS K 7244-4 (ISO 6721- 4. A friction false twist disc characterized by having a viscoelastic component tan δ measured by an tensile temperature test method according to 4) at an ambient temperature of 60 ° C. and a frequency of 60 Hz of 0.15 or less.

(2) The hydrogenated nitrile rubber is a hydrogenated nitrile rubber in which 10 to 100 parts by weight of zinc methacrylate and / or zinc acrylate is blended with 100 parts by weight of hydrogenated nitrile rubber ( The friction false twist disk as described in 1).
(3) A rubber ring obtained by cutting a rubber member having a tensile strength of a friction false twisted rubber member from a false twisted rubber member to a thickness of 2 mm and a width of 5 mm by a measurement method based on JIS K6251 at 25 ° C. and 500 mm / min. The frictional false twist disk according to (1) or (2), wherein the tensile strength measured at is 30 Mpa or more.

Here, when the rubber hardness of the peroxide vulcanized rubber member is less than 65 in JIS-A hardness, the wear resistance is poor and the durability is also poor. When the rubber hardness exceeds 95 in JIS-A hardness, even if tan δ is within the range of the present invention, the deformation of the rubber surface in contact with POY is too small to secure a sufficient twisting force.
Further, the member having the rubber hardness range is a tensile vibration type dynamic twist elastic test method at a temperature of 60 ° C. in accordance with JIS K7244-4 (ISO6721-4). It is a friction false twist disk made of a rubber member characterized by being small.
When tan δ at 60 ° C. in the test method of (1) is larger than 0.15, although depending on the rubber hardness, the dynamic rubber elasticity is lowered and the twisting force is lowered, so that a practical friction false twist is obtained. It can be said that it is difficult for a disc.

The friction false twist disk having better durability can be obtained by using a peroxide vulcanized rubber material in which 10 to 100 parts by weight or more of zinc methacrylate and / or zinc acrylate is further improved. Can be achieved. However, even in such a case, it is natural that the numerical range of the rubber hardness or tan δ needs to remain within the numerical range defined in (1) above.
In addition, when the tensile strength specified in (3) is 30 Mpa or more, the friction disk having better performance such as higher wear resistance and longer durability life is obtained as the tensile strength is higher. Can do.

The friction false twisted disk made of hydrogenated nitrile rubber (hereinafter sometimes referred to as HNBR) of the present invention has excellent heat resistance compared to the polyurethane rubber disk, so the atmospheric temperature of the drawing false twist machine is greatly changed. However, the twisting force hardly changes due to the molecular structure, and it is not necessary to control the temperature in the installation factory, which leads to significant power cost savings.
In general, it is known that hydrogenated nitrile rubber peroxide vulcanizates are more elastic than sulfur vulcanizates, but they have a specific physical property range among the peroxide vulcanizates. However, it has been found for the first time by the present inventor that the present invention has a practical level of twisting power equivalent to that of urethane rubber. And, by using a rubber member in which the nitrile content, peroxide vulcanization, rubber hardness and tan δ of hydrogenated nitrile rubber are limited within a certain range, the HNBR friction false twist disc of the present invention has excellent performance. This friction false twisted disc is a revolutionary new technology for the textile industry due to its high performance.

In order to show the excellent performance of the friction false twisted disk made of HNBR of the present invention, those using other friction false twist members will be described later as comparative examples.
The friction false twisted disk made of HNBR of the present invention has not only an appropriate coefficient of friction but also appropriate elasticity compared to those using other various kinds of friction false twisted members such as polyurethane shown in the comparative example. The excellent twisting force intended by the friction false twist member can be obtained.
Furthermore, since it has good heat resistance and is excellent in wear resistance and oil resistance, it is possible to stretch and falsely twist POY at high speed for a long period of time. In addition, since the swelling caused by the oil agent, especially the fiber oil agent, is less than that of the conventional polyurethane disk, the friction false twist disk has a remarkable effect that the life of the false false twist disk is significantly longer than that of the conventional polyurethane rubber disk. is there.

Furthermore, unlike the mechanical twisting ceramic disk, the HNBR friction false twist disk of the present invention is difficult to cut POY, and the performance of POY stretched and false twisted by this friction false twist disk may also be reduced. It can be said to be an ideal friction false-twisted disk member, almost as small as a polyurethane rubber disk.
In addition, the twisting force during actual use hardly changes depending on the temperature atmosphere of the factory where the drawing false twisting machine is installed, as in the case of ceramic disks, so the temperature adjustment required for polyurethane rubber disks is necessary. Even if little is done, a stable and high-quality drawn POY yarn can be produced at a higher speed than a ceramic disk.
Therefore, not only an expensive temperature control facility is unnecessary, but also the electricity bill for temperature adjustment when using a polyurethane rubber disk can be greatly saved.

In the prior art, since the false twisting disk of the friction false twisting device for polyester POY has only practically used a polyurethane rubber member having low heat resistance, after heating POY to near the softening point with a primary heater, Although it was necessary to cool to a considerably low temperature, it became possible to significantly improve the heat resistance of the false twisted disk by the present invention, and in the future, by adopting the friction false twisted disk made of HNBR of the present invention, Since the contact surface between the friction false twist disk and the POY raw yarn can always be used in an atmosphere of 150 ° C., for example, even when using a fiber material having a high softening temperature, the plate of the cooling zone can be significantly shortened, etc. The design of the main body of the drawing false twister also has the potential to be revolutionized.
Furthermore, polyurethane discs tend to take longer to demold because the molding material is mainly molded by injection molding, but the HNBR friction false twist disc of the present invention is similar to general synthetic rubber materials. In addition, because it can be manufactured by press molding, if you select the proper press hot plate temperature, hydrogenated nitrile rubber composition, and the number of molds to be designed properly, a large number of products can be produced in a relatively short time. It can be removed from the press mold and can be mass-produced and sold at a reasonable price comparable to or lower than that of polyurethane discs.

It is a figure which shows an example which has arrange | positioned 3 units | sets of the false twist apparatus of this invention. It is a front view of an example of the bossed disk for drawing false twisting machines of the present invention. It is a top view of an example of the bossed disk for drawing false twisting machines of the present invention. It is a front view of an example of the bossless disk for drawing false twisters of the present invention. It is a top view of an example of the bossless disk for drawing false twisting machines of the present invention. There are two types of cross-sectional shapes of polyester POY used in the present invention. It is a structural diagram of a general two-stage heater type stretching false twister

Hereinafter, the present invention will be specifically described.
The false twisting device referred to in the present invention means a set of a plurality of rotating members used in a known drawing false twisting machine, and a plurality of false twisting devices are usually arranged in the drawing false twisting machine. Is. For example, the example which has arrange | positioned the triaxial false twist apparatus is shown in FIG. The uniaxial false twisting device (A) includes a plurality of support members (not shown), and a frictional temporary product made of hydrogenated nitrile rubber (HNBR) that can be rotated on each of the members and axially attached as necessary. It consists of a twisted disk (1). These discs (1) are rotated at a high speed and run at a high speed while a POY (filamentous body) (2) is in contact with the surface thereof.

Next, a front view of an example of the HNBR bossed disk for false twisting device of the present invention is shown in FIG. 2, and a plan view is shown in FIG. This HNBR disk (1) for false twisting device has an end processed into a curved surface, has an annular portion (7) that contacts POY, and the same plane as this, and has a hollow portion (5) at the center. A flat plate (6) on which a resin boss (4) made of a tubular body is projected is formed integrally.
Similarly, FIG. 4 shows a front view of an example of an HNBR disk for false twisting device without a boss of the present invention, and FIG. 5 shows a plan view thereof.

An example of the HNBR disk of the present invention is made of a peroxide vulcanized rubber using a certain amount of a compounding agent so that a high hardness and high elasticity compounding can be imparted to the specific hydrogenated nitrile rubber (HNBR) component. Another example is a high-hardness, high-elasticity peroxide vulcanized rubber in which a certain amount of zinc methacrylate and / or zinc acrylate is blended with the specific hydrogenated nitrile rubber (HNBR) component.
As the specific hydrogenated nitrile rubber (HNBR) component, hydrogenated nitrile rubber having a combined acrylonitrile content of 17 to 44% by weight is used, and specific examples of the hydrogenated nitrile rubber include Zeon Pol 2000, 2010, 2011 of Nippon Zeon. , 2020, 2030, 3110 (trade name) and Telvan A3406, A3407, A3607, C3446, C3467, B3627 (trade name) manufactured by LANXESS Corporation.
In addition, as a reinforcing agent, general high activity and medium activity dry and wet white carbons such as Nipsil VN3 (made by Nippon Silica), Ultrageel VN3, Ultrageel VN2 (made by Degussa Evonik), Zeosil 500V (Manufactured by Taki Chemical), Aerosil R9
72, Aerosil R974 (manufactured by Toshin Kasei Co., Ltd.) and the like.

  As the organic peroxide vulcanizing agent used in this peroxide vulcanization, Nippon Oil & Fats Park Mill D, D40, Perhexa 3M, 3M-40, Perbutyl P, Peroximon F40, Perhexa 25B, Perhexa 25B-40 (trade name) ), Kayakumil D-40K of Kayaku Akzo, Trigonox 29, Trigonox 29/40, Parkadox 14, Parkadox 14/40, Kaya Hexa AD, Kaya Hexa AD / 40 (trade name), Sanken Chemical's Sanperok DCP, Sampelox CY-1 · 1, Sampelox TY-1 · 3, Sampelox AHTO (trade name), Rudol Yoshitomi's Rupeloc 500T, 500-40C, Rupazole 231, Rupazole 231-XL, Rupeloc 802, Rupako 802XL, Rupazole 101 , Ruperco 101-XL (Product ), And others.

In addition to the above, rubber cross-linking chemicals such as the general abbreviations TMP, EG, MAAAZn, AAZn can be used as co-crosslinking agents for peroxide vulcanization, and the chemical names are trimethylolpropane trimethacrylate and ethylene glycol dimethacrylate, respectively. Co-crosslinking agents for peroxide vulcanization such as zinc dimethacrylate and zinc diacrylate can also be used. That is, as trade names, Sunester EG, Sunester TMP, Sunester SK-30, Sanfel BM -G (above, Sanshin Chemical), Actor ZA, Actor ZMA (above, Kawaguchi Chemical Industry), Light Ester EG, Light Ester TMP (above, Kyoei Chemical), High Cross M, High Cross MP, High Cross ED -P, High Cross GT (above, Seiko Chemical Industry), Acryester EG, Acryester TMP (below) Mitsubishi Rayon), tike (NOF), R-20S (Asada Chemical Industry), NSSOB-PB (Japan Soda), actors BMR, etc. HVA-2 (DuPont) can be exemplified.
Examples of the viscoelasticity measuring apparatus exemplified in this patent include TA Instruments' Q800 and RSAIII, A & T Corporation's Leo Vibron dynamic viscoelasticity automatic measuring instrument, DDV-01FP and 25FPV. It can be illustrated.

About the manufacturing method of the hydrogenated nitrile rubber (HNBR) friction false twist disk of this invention The HNBR friction false twist disk of this invention can be obtained as follows, for example.
First, an appropriate amount of the hydrogenated nitrile rubber (HNBR) is wound around a roll using a rubber kneading roll or the like, and then a vulcanization accelerator, a filler, a processing aid such as stearic acid, and an appropriate amount of white carbon. Or zinc methacrylate or zinc acrylate. After kneading these well, separate them from the kneading roll and dump them out. Again, the dumped kneaded dough is finally kneaded with an appropriate amount of peroxide vulcanizing agent to complete the raw rubber dough.
Next, a separately formed molded body composed of a resin boss and a flat plate is inserted in advance into a press molding die heated and kept at a constant temperature by the upper and lower heating plates of the press molding machine. The kneaded dough is poured into this, and press-molded by pressurizing and heating under the conditions of constant temperature, pressure and vulcanization time. Thereafter, the molded product is taken out from the press mold, and the surface, particularly the surface in contact with POY, is finished to a certain smooth surface.

The resin constituting the molded body may be any resin as long as it does not deform during use and is usually used for a false twist friction disk. Examples thereof include polyester resins such as oxymethylene (POM), polyethylene terephthalate (PET), and polybutylene terephthalate (PBT).
The rubber hardness of the disk is JIS-A hardness 65 to 95, and particularly preferably JIS-A hardness 80 to 94. If the hardness is less than 65, it is inconvenient in that the wear resistance is reduced and the life is shortened, and if it exceeds 95, the POY to be processed on the contact surface of the hydrogenated nitrile rubber disc of the present invention is reduced. It becomes easy to slip, and the drawing false twist effect worsens.

  The HNBR friction false twist disk of the present invention is particularly preferably formed from a rubber member made of peroxide vulcanization using a hydrogenated nitrile rubber having a combined acrylonitrile content of 44% by weight or less. When a disk is made using hydrogenated nitrile rubber of so-called very high nitrile with a nitrile content exceeding 44% by weight, a disk with good oil resistance can be obtained, but the rubber elasticity that is a measure of twisting is sufficient However, the twisting power of the core is reduced, and the number of twists may be insufficient. On the other hand, when the amount of bonded acrylonitrile is less than 17% by weight, the oil resistance is deteriorated, and it is easily affected by the oil added to the POY raw yarn (10) when the POY (2) is drawn.

Next, there are two methods for vulcanizing the hydrogenated nitrile rubber: sulfur vulcanization blending and peroxide vulcanization blending. In the present invention, the peroxide vulcanization method is adopted. The reason is that when a hydrogenated nitrile rubber disc is formed by sulfur vulcanization, the rubber elasticity is remarkably reduced, so that the POY processed on the contact surface of the hydrogenated nitrile rubber disc becomes slippery and stretched false twisted This is because the effect is deteriorated and a predetermined number of twists cannot be obtained.
Further, the friction false twisted disk made of HNBR of the present invention is composed of 10 to 100 parts by weight of zinc methacrylate and / or zinc acrylate with respect to 100 parts by weight of hydrogenated nitrile rubber having the above nitrile content range. If a rubber material made of peroxide vulcanization is used, a more preferable performance with improved durability can be obtained.

Here, a hydrogenated nitrile rubber for peroxide vulcanization blended with zinc methacrylate or the like is already known, but a rubber material blended with 10 to 100 parts by weight of zinc methacrylate or the like in a hydrogenated nitrile rubber is known. The inventor of the present invention has for the first time found that the wear resistance as a stretched false twisted disk is increased, the life is extended, and at the same time the twistability is increased.
Peroxide-vulcanized hydrogenated nitrile rubber compounded with zinc methacrylate, for example, other reinforcing fillings such as Asahi Carbon's Carbon Black Seast S (trade name) and Nippon Silica Nipseal VN3 (trade name) white carbon Compared to peroxide vulcanized hydrogenated nitrile rubber with additives, it is often not only tough, but also has good rubber elasticity, and POY processed on the contact surface of hydrogenated nitrile rubber disk is less slippery Therefore, the stretching false twisting effect is improved, and a satisfactory twist number tends to be obtained even with a high-speed stretching false twisting process, which can be preferably used.

Furthermore, the present inventor has determined how much nitrile hydrogenated nitrile rubber is excellent in twisting properties for this drawing false twisting machine disk, and how much zinc methacrylate and the like is blended in this drawing. The invention of the present application has been completed by repeatedly investigating the characteristics of the false twister disk that are good for use as a friction material including rubber hardness or the like, and the hydrogenated nitrile rubber material of the present invention has been completed. The development of a drawing false twister disk is the first attempt in the textile industry.
Embodiments of the present invention will be described below with reference to the drawings.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but it goes without saying that the present invention is not limited to these examples.
[Example 1]
500 parts by weight of hydrogenated nitrile rubber (36% by weight of bound acrylonitrile) is wound around an 8-inch rubber kneading roll and masticated. Add a colorant, and then knead 100 parts by weight of Actor ZMA (Kawaguchi Chemical Co., Ltd. zinc methacrylate) and other additives well, then separate from the roll and let stand.
Subsequently, this rubber kneaded dough was again wrapped around a kneading roll, and 35 parts by weight of Park Mill D40 (Nippon Yushi Co., Ltd. peroxide vulcanizing agent) was kneaded to prepare kneaded dough A. An unvulcanized rubber sheet having a thickness of 5 mm was prepared from this rubber fabric A using an 8-inch rubber kneading roll.

This unvulcanized rubber sheet made of A was press vulcanized at 165 ° C. using a flat plate mold for 25 minutes to prepare a peroxide vulcanized sheet having a thickness of 2 mm. When the sheet A was left in a room at room temperature of 25 ° C. for 6 hours or longer and the rubber hardness was measured by a measuring method based on JIS K6253, the JIS-A hardness was 82.
Furthermore, since the temperature near the entrance of the false twisting device of POY (2) in FIG. 1 is a high temperature of 80 ° C. or higher, the heat resistance of the friction false twisted disk made of HNBR of the present invention was confirmed as follows.
As a result of measuring the tensile strength in an atmosphere of 25 ° C., 80 ° C. and 120 ° C. with a No. 2 dumbbell in accordance with JIS K6251, they were 39.5 Mpa, 15.1 Mpa and 9.6 Mpa, respectively.

The aging characteristics when the HNBR friction false twisted disc of the present invention was exposed to a high temperature for a long time were also confirmed as follows.
The No. 2 dumbbell was punched from the above sheet and left in an electric furnace set at a temperature of 150 ° C. for 4 weeks, and the tensile strength was measured at 25 ° C. in accordance with JIS K6251. The heat aging resistance could be confirmed.
In addition, when a sheet left naturally under the same conditions was measured according to JIS K7244-4 and JIS K6255, tan δ at a frequency of 60 Hz at 60 ° C. was 0.105.

  Next, a separately manufactured polybutylene terephthalate (PBT) molded body (flat plate portion: outer diameter 45 mm, thickness 9 mm, hollow portion inner diameter 12.0 mm) having only a flat plate without a resin boss, and a vertical heating plate 165 Set in advance in a molding die kept at a temperature of 0 ° C. and kept in a rubber press, and then pour the kneaded dough A extracted to a thickness of 5 mm into the mold, heat it for 30 minutes and apply it at a constant pressure. Press to create a press-molded product. Then, this molded product is finished so that the outer peripheral portion has a predetermined R shape, and finished to φ54.1 (outer diameter) × φ12.0 (inner diameter) × 9.0 mm (thickness of the flat plate portion). It was. The surface of this disk, particularly the R surface on the outer periphery that comes into contact with POY, was finished to a smooth surface.

Further, a rubber ring having a thickness of 2 mm and a width of 5 mm was cut out from the friction false twisted disk manufactured in Example 1, and the ring was left at room temperature for 4 hours and then pulled at 500 m / min in accordance with JIS K6251. The measured tensile strength was 33.5 MPa.
In addition, in order to confirm not only the dynamic viscoelastic properties of the vulcanized rubber sheet but also the dynamic viscoelasticity of the friction false twisted disk product made of HNBR of the present invention, the same unused product as the product used in this test The outer periphery of the rubber was cut into a ring shape with a thickness of 2 mm, processed into a strip with a thickness of 2 mm, a width of 5 mm, and a length of 40 mm, and at a measurement temperature of 60 ° C. and a frequency of 60 Hz in accordance with JIS K7244-4. When tan δ was measured, it was a value of 0.120 which was almost equivalent to the dynamic viscoelastic property of the vulcanized rubber sheet.
This disk is currently said to be one of the most balanced disks of durability and twistability, and uses four polyurethane false twisted disks with the same specifications and a rubber hardness of 85 in JIS-A hardness. Four simultaneous comparative tests were performed using a false twisting device.

As a result, when the friction false twisted disk made of HNBR of the present invention is used, all four examples can produce a bulky POY with the same texture as that of the polyurethane false twisted disk, and the same twist as the polyurethane false twisted disk. Proven to be hanging.
Furthermore, in one of them, for example, a trademark of Teijin's Polyester Filament, whose cross-sectional shape is not a circular POY as shown in FIG. -Trademark of polyester fiber of Sylpearl and Kuraray-Trademark of Krapera and Trademark of polyester fiber of Unitika-Stretch false twisting was performed using a so-called odd-shaped cross-section POY having a long triangular cross-sectional shape such as Silmy 5.
Even when this modified cross-section POY is used, the friction false twisted disk made of HNBR of the present invention can produce POY having a certain bulkiness without insufficient twisting or uneven twisting even after being used for 9 months or more. It was found that the disc could be used without being worn, and showed durability superior to one of the most durable polyurethane false twisted discs in the present situation.

[Comparative Example 1]
As a target of the simultaneous comparison test of Example 1 using the modified cross-section POY, a comparative test was performed using a conventional polyurethane false twist disk.
In addition, the false twisted disk made of polyurethane has a large difference depending on the type of the false twisted disk made of polyurethane and the number of false twisting devices, as the processed polyester POY to be used is thicker and wears more easily. In the case of 75 denier with a normal circular cross-section shape, it takes about 2 years to 1.5 years. In the case of 150 denier with the same cross-section shape, 1.5 years to 1 year. It is intensely 10 months to 7 months, and in the case of a deformed cross section, it is easier to wear than the above 300 denier, so the life is further shortened.

Actually, in the test using the above-mentioned polyurethane false twist disk, the sharp side surface shape of this deformed cross section causes the contact surface of the polyurethane false twist disk to be scraped, and the contact surface of the false twist disk is severely damaged. Even when the above-mentioned polyurethane false twisted disc with the shortest life of the disc was used, the rubber surface was worn in a short period of about 4 months, and further use was impossible.
Further, in order to confirm the heat resistance and heat aging resistance of the polyurethane false twisted disk having substantially the same components as in Comparative Example 1, a polyurethane rubber sheet having a thickness of about 2 mm was prepared. The method was tested.

As a result, the tensile strengths at 25 ° C., 80 ° C., and 120 ° C. were 41.5 Mpa, 10.4 Mpa, and 4.5 Mpa, respectively.
From this result, although the polyurethane false twist disk shows the result that the tensile strength is slightly better than Example 1 only at 25 ° C., the temperature near the twisting device during actual operation is 80 ° C. and At 120 ° C., there is only about half the strength of Example 1, and under the usage conditions assuming actual operation, the tensile strength is greatly inferior to Example 1, and compared with the friction false twisted disk made of HNBR of the present invention. It was confirmed that the wear resistance was poor.
Similarly to Example 1, in the long-term heat aging characteristics after leaving the No. 2 dumbbell of Comparative Example 1 in an electric furnace at 150 ° C. for 4 weeks, the strength decreased to almost zero, and again made of polyurethane It was confirmed that the heat resistance of the false twist disk was greatly inferior to that of the friction false twist disk made of HNBR of the present invention.

[Comparative Example 2]
Similarly to Example 1, a sulfur vulcanized HNBR false twist disk having the following composition was prepared.
500 parts by weight of hydrogenated nitrile rubber of 25% by weight of bound acrylonitrile is wound around an 8-inch rubber kneading roll and kneaded, and then 25 parts by weight of zinc white, 5 parts by weight of stearic acid, anti-aging agent, white reinforcing agent and coloring Knead the agent well, then cut it off the roll and let it stand naturally.
Subsequently, the rubber kneaded dough is again wrapped around a kneading roll, and 10 parts by weight of accelerator DM (manufactured by Kawaguchi Chemical Co., Ltd., MBTS) and 1.5 parts by weight of accelerator TMT (manufactured by Kawaguchi Chemical Co., Ltd., TMTM) are used as vulcanization accelerators. sedimentary sulfur (Tsurumi chemical) and 7. 5 parts by weight was kneaded to prepare a kneaded dough B. This rubber dough B was parted with an 8-inch rubber kneading roll to prepare an unvulcanized rubber sheet B having a thickness of 5 mm.

This rubber fabric B was press vulcanized in the same manner as in Example 1 to prepare a sulfur vulcanized sheet having a thickness of 2 mm. JIS K after this sheet B is left in a room at room temperature of 25 ° C. for 6 hours or more.
When the rubber hardness was measured by a measuring method based on 6253, the JIS-A hardness was 78.
In addition, when a sheet naturally left under the same conditions was measured according to JIS K7244-4, tan δ at a frequency of 60 Hz at 60 ° C. was 0.185, and the value was out of the range of the present invention.
Then, φ52.0 (outer diameter) × φ12.0 (inner diameter) × 9.0 m by the same method as in Example 1.
It finished to m (thickness of a flat plate part). The surface of this disk, particularly the R surface on the outer periphery that comes into contact with POY, was finished to a smooth surface.

Next, this disk is made of polyurethane of the same manufacturer as in Example 1, and 5 pieces of φ52.0 (outer diameter) × φ12.0 (inner diameter) × 9.0 mm (thickness of flat plate portion) false twisting disk are used. A simultaneous comparison test was carried out under the same twisting conditions using a POY having a conventional circular cross section attached to a false twisting apparatus and using a drawn false twist process.
As a result, the sulfur vulcanized disk of Comparative Example 2 was poor in twistability and could not be used as a false twisted disk because of insufficient twisting.
When the dynamic viscoelasticity of the friction false twist disk of Comparative Example 2 was confirmed by the same method as in Example 1, tan δ at a measurement temperature of 60 ° C. and a frequency of 60 Hz was measured to be 0.200.

[Comparative Example 3]
Similarly to Example 1, a false twisting disk having the following composition was prepared.
Wrapping 500 parts by weight of 36% by weight of hydrogenated nitrile rubber around an 8-inch rubber kneading roll and kneading it, 25 parts by weight of zinc white, 5 parts by weight of stearic acid, anti-aging agent, plasticizer, white reinforcement The kneading agent and the coloring agent are kneaded well, and then separated from the roll and allowed to stand naturally.
Subsequently, this rubber kneaded dough was again wrapped around a kneading roll, and 30 parts by weight of Park Mill D40 (a peroxide vulcanizing agent manufactured by NOF Corporation) was kneaded to prepare a kneaded dough / C. The rubber dough C was parted with an 8-inch rubber kneading roll to prepare an unvulcanized rubber sheet having a thickness of 5 mm.

This unvulcanized rubber sheet made of C was press vulcanized at 165 ° C. using a flat plate mold for 25 minutes to prepare a peroxide vulcanized sheet having a thickness of 2 mm. When the sheet C was left in a room at room temperature of 25 ° C. for 6 hours or longer and the rubber hardness was measured by a measuring method based on JIS K6253, the JIS-A hardness was 80.
In addition, when a sheet naturally left under the same conditions was measured according to JIS K7244-4, tan δ at a frequency of 60 Hz at 60 ° C. was 0.195, and the value was out of the range of the present invention.

Next, this disk was made of polyurethane of the same manufacturer as in Example 1, and 5 Ø54.1 (outer diameter) x Ø12.0 (inner diameter) x 9.0 mm (thickness of flat plate portion) false twisted disks were used. A simultaneous comparison test was performed on three cases in which a conventional circular POY having a normal circular cross-sectional shape was attached to a false twisting device and used by drawing false twisting.
As a result, the disk of Comparative Example 3 was not able to be used as a false twist disk because all three cases had poor twistability and did not sufficiently twist.
When the dynamic viscoelasticity of the friction false twist disk of Comparative Example 3 was confirmed by the same method as in Example 1, tan δ at a measurement temperature of 60 ° C. and a frequency of 60 Hz was measured to be 0.210.
A rubber ring having a width of 5 mm and a thickness of 2 mm was cut out from the friction false twisted disk manufactured in Comparative Example 3, and the ring was left at room temperature for 4 hours and then pulled at 500 m / min in accordance with JIS K6253. The tensile strength was 27.5 Mpa.

[Comparative Example 4]
Similarly to Example 1, a false twisting disk having the following composition was prepared.
Wrapping 500 parts by weight of 36% by weight of hydrogenated nitrile rubber around an 8-inch rubber kneading roll and kneading it, 25 parts by weight of zinc white, 5 parts by weight of stearic acid, anti-aging agent, plasticizer, white reinforcement After thoroughly kneading the agent and colorant, and further kneading 150 parts by weight of Actor ZMA (Zinc methacrylate manufactured by Kawaguchi Chemical Industry Co., Ltd.) that can be expected to improve rubber elasticity as in Example 1, it was separated from the roll and naturally put.

Subsequently, this rubber kneaded dough was again wrapped around a kneading roll, and 35 parts by weight of Park Mill D40 (Nippon Yushi Co., Ltd. peroxide vulcanizing agent) was kneaded to prepare kneaded dough D. The rubber dough D was parted with an 8-inch rubber kneading roll to prepare an unvulcanized rubber sheet having a thickness of 5 mm.
The unvulcanized rubber sheet made of D was press vulcanized at 165 ° C. for 25 minutes using a flat plate mold to prepare a 2 mm thick peroxide vulcanized sheet. When this sheet D was left in a room at room temperature of 25 ° C. for 6 hours or longer and the rubber hardness was measured by a measuring method based on JIS K6253, the JIS-A hardness was 85.

In addition, when the sheet D naturally left under the same conditions as in Example 1 is measured in accordance with JIS K7244-4 and JIS K6255, tan δ = 0.22 at a frequency of 60 ° C. and 60 Hz, and the value is the present invention. It was out of the range.
Next, this disk is made of polyurethane of the same manufacturer as in Example 1, and 5 pieces of φ52.0 (outer diameter) × φ12.0 (inner diameter) × 9.0 mm (thickness of flat plate portion) false twisting disk are used. Three simultaneous comparison tests were carried out under the same twisting conditions by attaching to a false twisting device and using a conventional circular POY with an ordinary circular cross-sectional shape and drawing false twisting.
As a result, in all three cases, the disk of Comparative Example 4 had poor twistability and did not sufficiently twist, so that it could not be used as a false twist disk.

When the dynamic viscoelasticity of the friction false twist disk of Comparative Example 4 was confirmed by the same method as in Example 1, the value of tan δ at a measurement temperature of 60 ° C. and a frequency of 60 Hz was 0.23.
A rubber ring having a width of 5 mm and a thickness of 2 mm was cut out from the friction false twisted disk manufactured in Comparative Example 4, and the ring was left to stand at room temperature for 4 hours and then pulled at 500 m / min according to JIS K6253. The strength was 33.8 Mpa.
As described above, a conventional friction false twisted disk made of polyurethane (Comparative Example 1), a sulfur vulcanized friction false twisted disk made of HNBR (Comparative Example 2), and peroxide vulcanized, but at a frequency of 60 Hz at 60 ° C. The tan δ value of the friction false twisted disk made of HNBR outside of the present invention (Comparative Examples 3 and 4) is inferior to that of the HNBR friction false twisted disk of the present invention. It could not be used.

The present invention relates to a false twisting device of a drawing false twisting machine used in the textile industry. More specifically, a yarn-like body called POY composed of a large number of continuous filaments such as polyester or nylon is directly attached to the outer peripheral surface of a disk. It is related with the friction false twist type false twist disk of the drawing false twist machine for twisting that POY by making it contact.
The HNBR friction false twist disc of the present invention is superior in heat resistance and aging resistance to conventional polyurethane rubber friction false twist discs, and even when used under severe high temperature and high humidity conditions, it has a durable life due to hydrolysis. Therefore, it is possible to provide a high-quality, high-performance friction false twisting type friction false twisting machine friction disk for a false twisting machine.

In addition, the HNBR friction false twist disc of the present invention has high quality even without adjusting the temperature because the twisting force is less affected by changes in the operating temperature atmosphere than the polyurethane friction false twist disc. Since POY processing is possible, the power cost required for air conditioning can be greatly reduced.
It is possible to provide a friction disk for a false twisting device of a friction false twisting-type drawing false twisting machine that has good oil resistance without swelling of the rubber surface even with oils contained in the OY raw yarn.
Further, the HNBR friction false twist disc of the present invention is used for false twisting devices of an innovative friction false twist type drawing false twisting machine with a long life that is less likely to cause yarn breakage during use compared to a ceramic disc. A friction disk can be provided.

1 Friction false twist disc 2 Polyester POY
3 Friction false twist disc fixing shaft 4 Boss part 5 Shaft hole 6 Resin part 7 Rubber part 8 Cross section round POY
9 irregular cross section (triangular) POY
10 POY yarn 11 First gripping part (first feed)
12 First heater 13 Cooling plate 14 Friction false twist device 15 Second grip (second feed)
16 Second heater 17 Third grip (third feed)
18 Stretched false twisted POY
19 Stretch false twist twisted POY winding paper tube
T1 Twisting tension (g) T2 Untwisting tension (g)

Claims (3)

  A friction false twist disk used in a false twisting device of a drawing false twister, wherein the friction false twist part is made of a rubber member obtained by peroxide vulcanization of 17 to 44% by weight of hydrogenated nitrile bonded acrylonitrile, and The rubber vulcanized rubber member has a JIS-A hardness of 65 to 95 and a JIS K7244-4 (ISO6721-4) conformity to a rubber hardness in a measurement method conforming to JIS K6253 at an ambient temperature of 25 ° C. A friction false twist disk characterized by having a viscoelastic component tan δ measured at an atmospheric temperature of 60 ° C. and a frequency of 60 Hz in a tensile vibration test method of 0.15 or less.   The hydrogenated nitrile rubber is a hydrogenated nitrile rubber comprising 10 to 100 parts by weight of zinc methacrylate and / or zinc acrylate per 100 parts by weight of the hydrogenated nitrile rubber. Friction false twist disc as described.   The tensile strength of the friction false-twisted rubber member is a measuring method in accordance with JIS K6251. A rubber ring cut into a thickness of 2 mm, a width of 5 mm, and a friction false-twisted rubber member diameter at 25 ° C. at 500 mm / min. The friction false twist disk according to claim 1 or 2, wherein the measured tensile strength is 30 Mpa or more.

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