JP2007217824A - Polyester multifilament yarn for yarn division - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester multifilament yarn which is used for yarn division, little forms scum in a yarn-producing process to yarn-dividing and knitting or weaving processes, and has an excellent yarn-dividing property and excellent process stability. <P>SOLUTION: This polyester multifilament yarn for the yarn division is characterized by being a yarn prepared by adhering an oiling agent to multifilament yarn comprising a polyester, having a single filament fineness of 10 to 50 dtex, and comprising 5 to 20 filaments, wherein the viscosity of the oiling agent has a viscosity of 50 to 150×10<SP>-6</SP>m<SP>2</SP>/sec, when water is removed, and the permeability of the oiling agent into the multifilament yarn in a concentration of 10 wt.% is ≤90 sec. The amount of the oiling agent adhered to the multifilament yarn is preferably 0.4 to 1.5 wt.%, and the filament-metal dynamic coefficient of friction and the filament-metal static coefficient of friction of the yarn are preferably 0.2 to 0.4 and 0.2 to 0.4, respectively. The elongation of the yarn is preferably 15 to 30%. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a polyester multifilament yarn for splitting. More specifically, the present invention relates to a polyester multifilament yarn for fiber separation that has very little scum generation from yarn production to fiber separation and weaving and weaving processes and is excellent in process stabilization.

  Polyester monofilaments produced from splitting polyester multifilament yarns have superior dimensional stability and heat resistance compared to other monofilament fibers such as nylon, so clothing (bracups, pads, etc.), heels, organdy, It is widely used for curtains, bedding (pillows, blankets), civil engineering / architecture (walls and flooring, purification filters), vehicles (seat cushions, etc.), clothing and industrial materials. In recent years, the demand has been increasing due to the recent improvement of the spinning and splitting technology, which has increased productivity and has been manufactured at a low cost.

  Therefore, for example, in order to further improve the fiber separation property, in Patent Document 1, in order to stabilize the folding of the drum end, an anionic surface activity that is an antistatic agent is added to a fatty acid ester compound and a compound obtained by adding an alkylene oxide to these compounds. An oil containing an agent and capable of adjusting the stretching tension has been proposed. Although the fineness is improved by adjusting the stretching tension, it is difficult to prevent the occurrence of white powder due to fiber scraping.

  In particular, in the direct drawing method in which the speed of yarn production is improved by improving productivity, for example, the direct drawing method in which the undrawn yarn is drawn directly without being wound once, the fiber surface is damaged due to increased friction with the guide and the roller. The fiber is scraped by rubbing with various contact bodies in the subsequent fiber separation process and subsequent warping, knitting, and weaving processes, and becomes a white powder that accumulates on various contact bodies, causing problems of yarn breakage and fluff generation There was a problem of triggering.

  For such a white powder problem, for example, Patent Document 2 proposes an oil agent based on an ethylene oxide (EO) and propylene oxide (PO) copolymer as an oil agent to be applied during spinning. However, the oil agent improves the slippage of the fibers and can suppress some white powder by strengthening the oil film, but the viscosity of the oil agent becomes higher, so the stickiness of the white powder also increases, it tends to deposit on the guide etc., and the friction resistance increases. It was difficult to induce fluff and use it as a fiber for splitting.

  As described above, in the conventional technique, a polyester multifilament yarn for fiber separation that has very little generation of scum from yarn production to fiber separation and knitting and weaving processes and has excellent process stability cannot be obtained.

JP 2003-278048 A JP 2004-100138 A

  An object of the present invention is to provide a polyester multifilament yarn for fiber separation that has very little generation of scum from yarn production to fiber separation and weaving processes, and is excellent in fiber separation properties and process stabilization.

The polyester multifilament yarn for splitting of the present invention is a yarn in which an oil agent is applied to a multifilament having a single yarn fineness of 10 to 50 dtex and a filament number of 5 to 30 filaments, and the viscosity of the oil agent upon dehydration is 50. × a ^{10 -6 ~150 × 10 -6 m 2} / s, and penetration into multifilament yarn at 10% by weight concentration is equal to or less than 90 seconds.

  Furthermore, the amount of oil agent attached to the multifilament yarn is 0.4 to 1.5% by weight, the fiber-metal dynamic friction coefficient of the yarn is 0.2 to 0.4, and the fiber-metal static friction coefficient is 0. .2 to 0.4, and the elongation is preferably 15 to 30%.

  According to the present invention, the polyester multifilament for splitting, which has a very low occurrence of scum from splitting to weaving and weaving, which is a post-process after the manufacturing process of the polyester multifilament yarn, and has excellent splitting properties and process stability A filament yarn is provided.

Hereinafter, embodiments of the present invention will be described in detail.
The polyester multifilament yarn targeted by the present invention is arbitrary as long as it can be separated, for example, polyethylene terephthalate, polytrimethylene terephthalate, polytetramethylene terephthalate, polycyclohexanedimethyl terephthalate, polyethylene-2,6-naphthalene. Examples thereof include polyester-based synthetic fibers such as carboxylate. Of these, polyester-based synthetic fibers such as polyethylene terephthalate, polytrimethylene terephthalate, and polytetramethylene terephthalate are preferable, and synthetic fibers made of polyethylene terephthalate are particularly preferable.

  The fineness of each single yarn constituting the polyester multifilament yarn for splitting of the present invention needs to be in the range of 10 to 50 dtex. Further, 15 to 40 dtex is preferable to obtain a split yarn. Further, the number of filaments constituting the multifilament yarn needs to be 5 to 30 filaments, preferably 20 filaments or less. The polyester multifilament for splitting according to the present invention is split by a splitting guide after spinning, drawing or Woolley processing, and becomes a splitting yarn that is a monofilament. Splitting yarn can be obtained.

  Further, the elongation of the yarn of the present invention is preferably 15 to 30%. If the elongation of the yarn is less than 15%, there is a tendency for white powder to be generated in the yarn splitting and splitting guide during spinning and splitting, resulting in poor quality. When the elongation exceeds 30%, stretching is performed during spinning. Spots tend to occur and tend to cause poor quality. A more preferable elongation is 20 to 25%.

The polyester multifilament yarn for splitting of the present invention is obtained by adding an oil agent to such a yarn, and the viscosity at the time of dehydration of the oil agent is 50 × 10 ^{−6 to} 150 × 10 ⁻⁶ m ² / sec. It is necessary to be. By setting the oil agent viscosity at the time of dehydration within such an appropriate range, in the present invention, it is possible to suppress the occurrence of scum, fluff, and yarn breakage. If the viscosity of the oil agent during dehydration is 150 × 10 ⁻⁶ m ² / sec. Or more, the oil agent becomes highly sticky, and scum accumulates on various contact bodies (guides, rollers, etc.) and breaks, or the scum that has fallen off becomes thread. Re-adhering to the product causes problems such as poor product quality. When the oil agent viscosity at the time of dehydration is 50 × 10 ⁻⁶ m ² / sec or less, it is used because winding failure such as traversing occurs when winding polyester multifilament yarn for splitting or monofilament obtained by splitting it. Have difficulty. In the present invention, by applying such an oil agent, fiber scraping due to rubbing with various contacts as well as a multi-fragment which is not normally separated in the separation process and subsequent warping, knitting and weaving processes. It has become possible to suppress the generation of white powder due to slag and to prevent the problems of yarn breakage and fluff generation due to accumulation on various contact bodies.

  Furthermore, the oil agent applied to the polyester multifilament yarn for splitting of the present invention needs to have a permeability to the multifilament at a concentration of 10% by weight of 90 seconds or less. More preferably, it is 80 seconds or less, and it is usually preferable that the lower limit is 10 seconds or more, or 20 seconds or more. Thus, by being excellent in permeability, oil agent adhesion spots between single yarns can be reduced, and the yarn of the present invention can reduce yarn quality spots between single yarns after splitting. The fact that there are few oil agent adhesion spots can be confirmed by, for example, fiber surface observation with an electron microscope (the oil agent is solidified with osmuic acid).

The oil agent used in the present invention is preferably an emulsion system in order to ensure such viscosity and permeability during dehydration. Further, in order to improve the permeability of the oil agent, it is preferable to appropriately select an emulsifier, an antistatic agent, and the like when a smoothing agent such as mineral oil, ester or ether ester is made into an aqueous emulsion. In particular, as an emulsifier that easily improves permeability, propylene oxide or ethylene oxide is usually added to 3 to 10 mol of a higher alcohol having 8 to 15 carbon atoms. Here, the higher alcohol may be linear or branched, but secondary or tertiary alcohols are preferred, and secondary alcohols are particularly preferred because they can provide more remarkable effects. As such alcohol, 2-ethylhexyl alcohol, 6-dodecyl alcohol, secondary alcohol (C ₁₂ -C ₁₄ ) and the like can be preferably used. Further, the number of moles of propylene oxide and / or ethylene oxide to be added is 3 to 9 moles, preferably 7 to 9 moles per mole of the alcohol. The content of the emulsifier in the oil is preferably 5 to 15% by weight, more preferably 8 to 12% by weight. If the content is less than 5% by weight, the wettability is insufficient, and it tends to be difficult to evenly adhere the oil agent to the fibers. On the other hand, when the amount exceeds 15% by weight, the ratio of the smoothing agent component decreases, and thus fluff and yarn breakage tend to occur due to rubbing due to insufficient smoothness.

  The amount of the oil agent attached to the polyester multifilament yarn for fiber separation is preferably 0.4 to 1.5% by weight as an active ingredient with respect to the fiber. When the adhesion amount is less than 0.4% by weight, smoothness and antistatic properties are insufficient, and troubles such as fluff, yarn breakage, and scum generation tend to occur. On the other hand, even if it exceeds 1.5% by weight, the improvement effect of fluff, yarn breakage, and scum generation is small, and conversely, excessive oil agent tends to contaminate the yarn guide etc. is not.

  The polyester multifilament yarn for splitting according to the present invention preferably has a yarn smoothness (fiber-metal dynamic friction coefficient F / Mμd) in the range of 0.2 to 0.4. The polyester multifilament yarn for splitting has a smaller number of filaments than normal polyester multifilament yarn, so the frictional resistance with the contact body becomes larger during drawing and splitting processes, causing damage to the yarn and causing white powder. Although it is easy, they can be prevented by setting F / Mμd to 0.4 or less. However, if it is too low, there is a tendency that the winding will occur at the time of winding and the winding property tends to be poor. Therefore, the fiber-metal dynamic friction coefficient of the yarn is preferably in the range of 0.2 to 0.4.

In order to make the yarn in such a range of F / Mμd, it is necessary to appropriately select a smoothing agent, an emulsifier, an antistatic agent, and the like. For example, the smoothing agent is preferably a mineral oil or an aliphatic ester compound, which can reduce the frictional resistance and suppress the generation of fluff due to abrasion. The viscosity at 30 ° C. is preferably in the range of 50 to 200 × 10 ⁻⁶ m ² / sec. For example, conventionally known mineral oils are used, and aliphatic ester compounds are compounds such as fatty acid monoalkyl esters, aliphatic dicarboxylic acid dialkyl esters, mono- or multi-fatty acid esters of aliphatic polyhydric alcohols, and have a molecular weight of 250. Those in the range of ˜550 are preferred. When the molecular weight of the ester is less than 250, the smoothness tends to decrease because the heat is easily evaporated. On the other hand, if it exceeds 550, the smoothness tends to be insufficient. Examples of preferably used aliphatic esters include fatty acid monoalkyl esters such as octyl octanoate, octyl stearate, isotridecyl laurate, isotridecyl oleate, lauryl oleate, and the like, and aliphatic dicarboxylic acid dialkyl esters. Examples thereof include diisooctyl adipate, and mono- or multi-fatty acid esters of aliphatic polyhydric alcohols include, but are not limited to, trimethylolpropane trioctanate. Of these, fatty acid monoalkyl esters are preferred.

  In addition to the fiber-metal dynamic friction coefficient of the yarn, the fiber-metal static friction coefficient (F / M μs) is preferably in the range of 0.2 to 0.4. If the fiber-metal static friction coefficient is too high, the oil film strength is weak, and the fiber is damaged in the stretching or splitting process, and white powder tends to be generated. On the other hand, if it is too low, the viscosity of the oil must be increased to strengthen the oil film, and the smoothness tends to be inferior.

  In order to obtain such a fiber-metal static friction coefficient, it is preferable to use an oil film reinforcing agent. When the oil film reinforcing agent is adsorbed to the drawing roller or the fiber splitting guide, the coefficient of static friction between the fibers and the metal is reduced, and it becomes possible to protect the yarn without destroying the oil agent layer on the fiber.

  As the oil film reinforcing agent to be used, for example, an alkyl carboxylate having 8 to 18 carbon atoms or an alkyl phosphate salt having 8 to 18 carbon atoms is preferable. The alkyl carboxylate is easily synthesized by neutralizing a carboxylic acid having 8 to 18 carbon atoms with an alkali. As the carboxylic acid, monocarboxylic acids such as caprylic acid, capric acid, lauric acid, palmitic acid, stearic acid and oleic acid are preferable. Examples of the alkali to be neutralized include alkali metals such as sodium, potassium and lithium, secondary amines such as dipropylamine, dibutylamine and dioctylamine, and tertiary amines such as dibutylamine and dioctylamine. The alkyl phosphate ester salt is easily synthesized by esterifying an alcohol having 8 to 18 carbon atoms with phosphoric acid and neutralizing with an alkali. Examples of the alcohol include caprylyl alcohol having 8 to 18 carbon atoms, capryl alcohol, lauryl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, and branched alcohols thereof. The alkali to be neutralized is an alkali metal or an amine. Examples of the alkali metal include sodium, potassium, and lithium. Examples of the amine include secondary and tertiary amines, and examples of the secondary amine include diethylamine, dipropylamine, dibutylamine, and dioctylamine. Examples of the tertiary amine include triethylamine, tripropylamine, tributylamine, and trioctylamine. Of these, amine salts are preferred.

  The oil used in the yarn of the present invention is based on the above components, but other components such as an antioxidant, a compatibilizing agent, and a stability improver are added to the present invention as necessary. You may add in the range which does not impair the objective.

  The polyester multifilament yarn for fiber separation of the present invention can be obtained by forming an emulsion obtained by emulsifying the oil as described above in water, or by using the stock solution as it is and attaching it.

  In general, any known means can be used to apply the oil agent to the polyester multifilament yarn for splitting, but in particular, a measured amount is given through an oiling nozzle that reduces the resistance to the yarn. The method is a more preferred method.

  Such a polyester multifilament yarn for splitting according to the present invention has a very small occurrence of scum from the splitting process to the weaving process, as well as the subsequent processes such as the spinning process, and the splitting property. And a uniform polyester monofilament material having excellent process stability.

  Hereinafter, the present invention will be described in more detail with reference to examples. In addition, the measured value in an Example was measured with the following method.

(1) Oil agent dehydration viscosity 20 cc of oil agent is heat treated for 3 hours with a hot air dryer at 105 ° C to remove moisture, and the oil agent is thoroughly stirred. It was measured. The measurement was averaged three times.

(2) Emulsion permeability A no-oil yarn of polyester multifilament yarn for splitting is prepared, and about 0.3 g is wound around a roller having a roller diameter of 3 cm with a winding tension of 2.5 g, so that there is no scattering or deformation. Make a ring-shaped sample with 4 spots using no oil thread wetted with water, and then drop the sample into the 1% emulsion. The time to do was measured. The measurement was averaged three times.

(3) OPU measuring method Immediately after drying 3 g of polyester multifilament yarn for splitting at 105 ° C. for 2 hours, the weight (A) is measured and immersed in 300 cc of an aqueous cleaning solution mainly composed of sodium alkylbenzene sulfonate, Apply ultrasonic waves at 40 ° C. for 10 minutes. The washing solution is discarded, washed with running water at 40 ° C. for 30 minutes, and then air-dried at room temperature. Then, immediately after drying at 105 ° C. × 2 hours, the weight (B) is measured and the OPU is calculated from the following equation.
OPU% = (A−B) / B × 100

(4) Dynamic friction between yarn and metal contact body Using stretched yarn made of polyester multifilament for splitting, using a fiber / metal running friction measuring machine, using a satin chrome pin with a diameter of 60 mm as a friction body at a running speed of 300 m / min. The friction body exit side tension (T ₂ ) was measured at a contact angle of 180 ° and a friction body entrance side tension of 10 g (T ₁ ). The inter-filament friction coefficient (f) was calculated from the following equation regarding the friction of the belt running on the cylinder, and the dynamic friction coefficient was obtained.
f = (1 / π) · (ln (T ₂ / T ₁ ))

(5) Static friction between yarn and metal contact body A satin chrome pin having a diameter of 60 mm as a friction body at a running speed of 0.1 m / min using a drawn yarn made of polyester multifilament for splitting and a running friction measuring machine between fibers and metal. Was used to measure the friction body exit side tension (T ₂ ) at a contact angle of 180 degrees and a friction body entrance side tension of 30 g (T ₁ ), and the static friction coefficient was calculated from the following formula.
f = (1 / π) · (ln (T ₂ / T ₁ ))

(6) Rolled form A drawn yarn made of polyester multifilament for splitting was visually observed and evaluated in the following three stages.
◯: Not twilled, Δ: Slightly tipped, ×: Many twills

(7) Wrinkle scum A drawn yarn made of polyester multifilament for splitting was split into a number of cheeses corresponding to the number of filaments by a splitting machine to obtain a single filament. (For example, if it is a polyester multifilament of 220 dtex / 10 filament, it is divided into 10 cheeses to make 22 dtex / 1 filament.) The obtained single filament split yarn is run for 30 minutes at a speed of 300 m / min. The scum adhering to the wings was visually observed and evaluated in the following three stages.
○: Scum is hardly adhered, Δ: Scum is slightly adhered, ×: Scum is largely adhered.

(8) Separation property Using a Kanda type separation device, the single filament tension was adjusted to 0.8 to 1.0 cN / dtex, and separation was performed at a speed of 600 m / min. At this time, the full winding rate of the single filament, that is, the ratio of splitting into single filaments without breakage was taken as the value of splitting property.

[Example 1]
The apparatus shown in FIG. 1 was used to spin polyethylene terephthalate having an intrinsic viscosity of 0.65 with a spinning apparatus 1 having a spinneret having five orifice holes, and the amount of oil agent described in Table 1 was 0.8% by weight. After applying the water-based oil so as to become, it is taken up by a pair of heated take-up rollers 4 and 5 having a speed of 700 m / min and a surface temperature of 100 ° C., and the same pair of heated draw rollers 6 and 7 as the heated take-up rollers. After being stretched by 4.3 times and heat-fixed, the drum-shaped package 9 was wound up at a speed of 2970 m / min.

  The obtained multifilament yarn had a total fineness of 220 dtex and a single filament fineness of 22 dtex (that is, the number of single filaments was 10). The multi-filament yarn package is shown in Table 1 together with the twill disengagement and splitting properties.

The conceptual diagram which shows the manufacturing method of the multifilament yarn package of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spinning device 2 Multifilament yarn 3 Oil supply device 4,5 Heating take-off roller 6,7 Heat drawing roller 8 Drum-shaped package

Claims (4)

A yarn in which an oil agent is applied to a multifilament having a single yarn fineness of 10 to 50 dtex and 5 to 30 filaments made of polyester, and the viscosity of the oil agent upon dehydration is 50 × 10 ^{−6 to} 150 × 10 ⁻⁶ m ^2. The polyester multifilament yarn for splitting, characterized in that the permeability to the multifilament yarn at a concentration of 10% by weight is 90 seconds or less.   2. The polyester multifilament yarn for splitting according to claim 1, wherein the amount of oil agent attached to the multifilament yarn is 0.4 to 1.5% by weight.   The polyester multifilament yarn for splitting according to claim 1 or 2, wherein the yarn has a fiber-metal dynamic friction coefficient of 0.2 to 0.4 and a fiber-metal static friction coefficient of 0.2 to 0.4.   The polyester multifilament yarn for splitting according to any one of claims 1 to 3, having an elongation of 15 to 30%.

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