JP3086153B2 - Synthetic fiber drawing false twist method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drawing and untwisting a synthetic fiber undrawn multifilament yarn simultaneously with drawing. More specifically, the present invention is particularly effective when processing a high-density synthetic fiber undrawn multifilament yarn of fine denier without generating fluff or breakage, and without accumulating sludge on a high-temperature heater guide. The present invention relates to a draw false twisting method capable of obtaining stable workability without causing a problem of yarn guide separation during running.

[0002]

2. Description of the Related Art Conventionally, at the same time as stretching, false twisting (hereinafter referred to as DT)
The friction false twisting method (hereinafter sometimes referred to as friction) has been adopted as a method for performing Y processing. However, the processing speed has been dramatically increased in recent years, and the processing speed has been increased to 700 m / min or more. It has come to be. Recently, a DTY processing machine using a non-contact type heater has been developed, and processing at a speed of 1000 m / min or more has been carried out commercially.

[0003] However, an increase in the processing speed causes a problem that the generation of fluff due to damage to the fibers and the number of yarn breaks increase due to an increase in friction between the yarn and various contact members (eg, guides, rollers, etc.). Further, a very large centrifugal force acts on the running yarn, causing a problem that the oil agent is squeezed out of the fiber surface and shaken off, and adheres to the guide in the heater as sludge.

[0004] In order to solve such a problem, many oil agents having excellent heat resistance and processing stability, for example, oil agents mainly containing polyether to which ethylene oxide or propylene oxide is added have been proposed (for example, JP-A-49-31996, JP-A-50-155799, and JP-A-50-155796. Certainly, such an oil agent containing a polyether as a main component has a stronger oil film than an ester-based oil agent, so that fluff is less likely to occur, and furthermore, since heating residue is extremely small, formation of heater sludge can be suppressed. However, since a small amount of an anion compound used in combination to prevent the generation of static electricity is generally a metal salt, a metal oxide is fixed and deposited on the heater guide as a thermal decomposition product. And although this amount is small,
When the yarns running at high speed come into contact with each other, fluff and breakage are likely to occur. Therefore, when performing high-speed false twisting, cleaning of the heater guide is required, which causes a problem that the production efficiency is greatly reduced.

[0005] An oil agent to which polyether-modified silicon is added as a heater sludge adhesion preventing agent has been proposed (for example, Japanese Patent Application Laid-Open No. 60-181368). However, when a non-contact heater of 450 ° C. or higher is used as the heater, the silicon compound is thermally decomposed and becomes glassy and deposits on the guide, which causes a problem that cleaning becomes extremely difficult. As a new problem, the organic gas decomposed and volatilized in the heater condenses on the cooling plate on the outlet side of the non-contact heater and accumulates in the form of a tar. There is a problem that the plate is easily detached from the plate, and it is difficult to stably perform DTY processing.

In recent years, false twisted yarns have also tended to become finer denier, and recently, fine denier yarns having a single fiber denier of 1.5 or less have been required. However, when a fine denier yarn is to be produced at a high speed, in the oil agent containing a polyether as a main component proposed above, since the specifically disclosed polyether has a small molecular weight, its oil film The strength is still insufficient and fluff is likely to occur. Therefore, as a fine denier processing oil,
There has been proposed an oil agent containing a high molecular weight polyether having a molecular weight of 7000 to 12000 for strengthening the oil film (for example, JP-A-4-34088). However, such oils have high viscosity, so that the smoothness is reduced and the coefficient of friction between fibers (μF / F) is also reduced, so that it is difficult to wind the undrawn yarn after the oil treatment.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and has as its object to perform friction false twisting of synthetic fiber undrawn multifilament yarn, particularly fine denier yarn, at a high speed. Even without fluff or breakage,
Moreover, it is an object of the present invention to provide a draw false twisting method which does not accumulate sludge on a high-temperature heater and has a stable workability without a problem of yarn deviating during running of the yarn.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, by using two kinds of specific polyethers in combination and combining ether ester compounds which are easy to volatilize at a low temperature, By improving the smoothness and the oil film strength from high to high temperatures, and by using a specific ether compound that is easy to evaporate, the uniform adhesion of the oil agent is improved and the oil agent adhesion amount is reduced (low opu). ) Becomes possible, and as a result, scattering of oil droplets during the false twisting process is extremely reduced, so that heater guide sludge (hereinafter sometimes referred to as heater sludge),
Further, the present inventors have found that the amount of accumulated oil droplets on the cooling plate is reduced and the stability of high-speed false twisting is improved, and the present invention has been achieved.

That is, according to the present invention, when the synthetic fiber undrawn multifilament yarn is subjected to false twisting simultaneously with drawing using a friction false twisting device, the undrawn multifilament yarn is provided with the following (A) to (D) A) false twist drawing method for synthetic fibers, characterized by applying an oil agent containing a component as an essential component and having a permeability of 1 second or less. (A) a copolymer of propylene oxide (PO) and ethylene oxide (EO) having an average molecular weight of 10
00-3000, PO / EO copolymer weight ratio is 50/50
(B) a copolymer of propylene oxide (PO) and ethylene oxide (EO) having an average molecular weight of 50 to 80/20;
00-7000, PO / EO copolymer weight ratio of 40/60
(C) An alcohol having 6 to 18 carbon atoms to which 1 to 5 moles of ethylene oxide (EO) has been added by using a fatty acid having 6 to 18 carbon atoms. Esterified ether ester compounds 5 to 15
(D) 5 to 15% by weight of an ether compound obtained by adding 3 to 9 mol of propylene oxide and / or ethylene oxide to an alcohol having 8 to 15 carbon atoms.

Hereinafter, the essential components (A) to (A) of the present invention will be described.
(D) will be described. The polyether as the component (A) of the present invention is used to further improve smoothness at high temperatures and to prevent the generation of fluff and yarn breakage, and is a copolymer of ethylene oxide and propylene oxide. Thus, it is a random or block type polyoxyalkylene glycol copolymer having an average molecular weight of 1,000 to 3,000 and a copolymerization ratio (weight ratio) of propylene oxide and ethylene oxide of 50/50 to 80/20. Of course, one end or both ends of these polyoxyalkylene glycol copolymers may be blocked with an alkyl group or the like via an ether, ester, thioether, amino ether, or the like. There is no restriction.

Such a polyoxyalkylene glycol copolymer can be obtained by copolymerizing ethylene oxide and propylene oxide by a conventionally known method. Usually, a compound having at least one active hydrogen capable of reacting with the alkylene oxide is used. And copolymerized with ethylene oxide and propylene oxide. Examples of the compound having active hydrogen include monohydric or higher alcohols when the group having active hydrogen is a hydroxyl group, monohydric or higher valent acids when the carboxyl group is, and monovalent or higher amino compounds when the group is an amino group. Can be given. Among them, those using alcohols are preferable because generation of heater sludge is reduced.

The average molecular weight of the component (A) is 1000
If it is less than 1, thermal stability is poor, decomposition and volatilization leads to insufficient smoothness, and furthermore, the swellability of the rubber used in the friction false twisting portion deteriorates, so that it cannot be used. On the other hand, if the average molecular weight exceeds 3,000, the smoothness is lowered due to an increase in viscosity, which is not appropriate. On the other hand, if the copolymerization ratio of ethylene oxide exceeds 50% by weight, the swellability of the rubber used in the friction false twisting portion tends to deteriorate. On the other hand 2
When the content is less than 0% by weight, the self-emulsifying property is reduced.
The necessary amount of the emulsifier used in combination increases, and the false twisting processability decreases.

The content of the component (A) in the oil agent is 30.
If it is less than this range, the smoothness at high temperatures will be reduced, and if it exceeds this range, the content of other components will be reduced. Insufficiently achieves the object of the present invention.

The polyether, which is the component (B) of the present invention, is used to protect the yarn surface by strengthening the oil film and to prevent the generation of fluff, especially when high-density thin yarn is subjected to high-speed false twisting. A copolymer of ethylene oxide and propylene oxide having an average molecular weight of 5000 to 7000 and a copolymerization weight ratio of propylene oxide and ethylene oxide of 40/60 to 20/80.
Is a random or block copolymer.
The method for producing such a polyether is the same as that for the above-mentioned polyoxyalkylene glycol copolymer as the component (A).

The polyether has an average molecular weight of 5,000.
Or the ethylene oxide copolymer weight ratio is 6
If it is less than 0%, prevention of generation of fluff during false twisting becomes insufficient. On the other hand, if the average molecular weight exceeds 7000, the coefficient of friction between fibers (μF / F) decreases, and it becomes difficult to wind the undrawn yarn after the oil agent treatment, and the copolymerization weight ratio of ethylene oxide is reduced to 80%. Exceeding the temperature is not preferred because heat curing is likely to occur and heater sludge may be caused.

The content of the component (B) in the oil agent must be at least 30% by weight in order to prevent fluff during false twisting, but if it exceeds 50% by weight, the viscosity of the oil agent increases and the smoothness decreases. As a result, the yarn forming property is reduced, and the friction coefficient between fibers (μF / F) is reduced, which causes a problem in the winding property, which is not preferable.

The ether ester compound (C) of the present invention improves smoothness at low temperatures.
It is used to suppress the generation of fluff due to abrasion and to prevent the yarn from coming off the cooling plate and the like, and has 6 to 6 carbon atoms.
It is obtained by adding 1 to 5 moles of ethylene oxide to 18 alcohols and then esterifying them with a fatty acid having 6 to 16 carbon atoms. Here, when the added amount of ethylene oxide or propylene oxide is 6 mol or more, the smoothness is lowered, which is not preferable. As the alcohol having 6 to 18 carbon atoms, the desired effects of the present invention can be obtained whether the alcohol is straight-chain or branched, but preferably 2-ethylhexyl alcohol,
Lauryl alcohol, 6-dodecyl alcohol and the like. On the other hand, examples of the fatty acid having 6 to 16 carbon atoms include caproic acid, caprylic acid, lauric acid, and palmitic acid. Particularly preferred ether ester compounds include isooctyl alcohol (EO) ₂ (PO) ₂ caprylate, lauryl alcohol (EO) ₂ octanoate, lauryl alcohol (EO) ₂ decanoate, lauryl alcohol (EO) ₂ laurate and the like. Since it is good and hardly heat cured, there is little heater sludge, which is convenient.

The content of the ether ester compound in the oil agent must be 5 to 15% by weight, preferably 10 to 15% by weight. If the content is less than 5% by weight, the smoothness is insufficient and the effects of the present invention cannot be obtained. On the other hand, if it exceeds 15% by weight, the content of the polyethers (A) and (B) of the present invention is insufficient, so that fluff and yarn breakage increase.

Next, the ether compound as the component (D) of the present invention is used for uniformly adhering the oil agent to the fiber yarn, and propylene oxide or ethylene oxide is added to the alcohol having 8 to 15 carbon atoms. 3 to 9 moles are added by a usual method. Here, the alcohol may be straight-chain or branched, but secondary or tertiary alcohols are particularly preferable because secondary alcohols have more remarkable effects. Such alcohol 2-ethyl-F kills alcohol, 6-dodecyl alcohol, it can be preferably used a secondary alcohol (C ₁₂ ~C ₁₄₎ or the like. The number of moles of propylene oxide or ethylene oxide to be added is preferably 3 to 9 moles, particularly preferably 7 to 9 moles per mole of the alcohol. If the added amount is out of this range, the permeability of the oil agent decreases, and the object of the present invention cannot be achieved.

It is necessary that the content of the component (D) in the oil agent is 5 to 15% by weight, especially 8 to 12% by weight. If the content is less than 5% by weight, the permeability is insufficient, and it is difficult to uniformly adhere the oil agent to the fibers. Meanwhile, 1
If the content exceeds 5% by weight, the content of the polyethers (A) and (B) of the present invention is reduced, so that the smoothness at high temperature is insufficient or the oil film on the yarn surface is insufficiently strengthened, resulting in a false twist during false twisting. Fluff and breakage increase.

In the present invention, since the oil agent uniformly adheres to the undrawn multifilament yarn by using the ether compound of the above-mentioned component (D), the amount of the oil agent applied to the undrawn yarn is conventionally 0.3 to 0.3. Whereas about 0.5% by weight was required, even if the opu was reduced to about 0.15 to 0.3% by weight, the smoothness was good, and as a result, scum was not fixed on the heater, and Oil droplets do not adhere to the cooling plate.

In the present invention, the undrawn multifilament yarn to which the oil containing the components described above has adhered is
Further, the water permeability must be 1 second or less. The water permeability here refers to a 125 denier, high multifilament no-oil yarn having 72 filaments wound around a roller having a roller diameter of 3 cm.
About 3 g was wound up with 5 g to make a ring-shaped sample, and then, when the sample was dropped into a 1% emulsion, it was a time for the sample to completely settle below the emulsion surface. If the water immersion exceeds 1 second, it is difficult to uniformly apply the oil agent to the undrawn multifilament yarn, and the object of the present invention cannot be achieved.

The above oil agent used in the present invention includes:
In addition to the above components, as long as the effects of the present invention are not impaired,
Conventionally used components such as anionic surfactants and antioxidants may be blended. The oil agent used in the present invention is suitably applied to an undrawn multifilament yarn as an aqueous emulsion containing 3 to 10% by weight of an oil agent component. At this time, as a method of applying, any conventionally used method such as an oiling roller method and a method using a nozzle may be used. Further, as the undrawn multifilament yarn to which the oil agent is applied, in particular, a polyethylene terephthalate-based polyester fiber having a single denier of 1.5 denier or less is preferable because the effect of the present invention is large.

In the present invention, the undrawn yarn to which the above-mentioned oil agent has been applied is subjected to friction false twisting. In this case, the false twisting method may be either a disk or a belt friction method. Also, there is no need to employ any special conditions as false twist processing conditions, and it is sufficient to arbitrarily select ordinary conditions according to the desired crimping performance. Above all, when processing at a processing speed of 600 m / min or more, particularly 800 to 1200 m / min, the false twist heater is a non-contact heater,
Particularly, a non-contact heater having a temperature of 400 ° C. or more is particularly preferable because the effect of the present invention is large.

[0025]

As described in detail above, the oil agent provided to the undrawn multifilament yarn has a molecular weight of 1
Since the PO / EO copolymerized polyether having a molecular weight of from 000 to 3,000 and the PO / EO copolymerized polyether having a molecular weight of from 5,000 to 7000 are used in combination, the improvement of smoothness and the enhancement of an oil film can be achieved at the same time. Since the ester compound is blended, the smoothness is good over a wide range of temperatures, and the addition of a specific ether compound allows the oil agent to be uniformly adhered to the undrawn multifilament yarn. Stretch false twisting can be stably performed even with opu, and stable high-speed processing can be performed without accumulation of heater sludge.

[0026]

The present invention will be described below in more detail with reference to examples. In addition, each evaluation item in an Example followed the following Table 1.

[0027]

[Table 1]

Example 1 An undrawn yarn (108 denier / 72 filaments) made of polyethylene terephthalate having an intrinsic viscosity of 0.620 was melt-spun at a spinning speed of 3400 m / min. The emulsion was applied with an oiling roller so as to be 0.25% by weight of an oil agent effective component based on the weight of the fiber. The undrawn yarn is processed at a processing speed of 1000 m / min at a processing magnification of 1.57 times, a non-contact type first heater set temperature of 550 ° C., and a non-contact type second heater set temperature of 300 ° C. using a urethane disk. , And simultaneous stretching and false twisting were continuously performed for 240 hours. The results at that time are also shown in Table 2.

[0029]

[Table 2]

Example 2 The same procedure as in Example 1 was carried out except that the amount of oil applied was changed as shown in Table 3 for the oils of Experiments No. 1 and No. 2 used in Example 1. Table 3 shows the results.

[0031]

[Table 3]

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-32897 (JP, A) JP-A-63-50529 (JP, A) JP-A-49-35693 (JP, A) JP-A Sho 56- 165071 (JP, A) JP-A-2-91273 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06M 13/00-15/715

Claims (2)

(57) [Claims] When a non-stretched synthetic filament yarn is subjected to false twisting simultaneously with stretching using a friction false twisting device, the unstretched multifilament yarn has the following (A) to
A draw false twisting method for synthetic fibers, which comprises applying an oil agent containing the component (D) as an essential component and having a permeability of 1 second or less. (A) a copolymer of propylene oxide (PO) and ethylene oxide (EO) having an average molecular weight of 10
00-3000, PO / EO copolymer weight ratio is 50/50
(B) a copolymer of propylene oxide (PO) and ethylene oxide (EO) having an average molecular weight of 50 to 80/20;
00-7000, PO / EO copolymer weight ratio of 40/60
(C) An alcohol having 6 to 18 carbon atoms to which 1 to 5 moles of ethylene oxide (EO) has been added by using a fatty acid having 6 to 18 carbon atoms. Esterified ether ester compounds 5 to 15
(D) 5 to 15% by weight of an ether compound obtained by adding 3 to 9 mol of propylene oxide and / or ethylene oxide to an alcohol having 8 to 15 carbon atoms. 2. The method according to claim 1, wherein the amount of the oil agent is 0.15 to 0.30% by weight based on the weight of the fiber.