JPS6144976B2 - - Google Patents

Description

[Detailed description of the invention]

In the present invention, when a thermoplastic synthetic fiber undrawn multifilament yarn is drawn and simultaneously subjected to false twisting to produce a crimped yarn, the trailing end of the undrawn multifilament yarn is processed first and then processed. The present invention relates to a method for effectively producing crimped yarn by continuously performing stretching and simultaneous false twisting by connecting the ends of undrawn multifilament yarns. When polyester undrawn yarn is stretched and simultaneously false twisted to produce crimped yarn, the rear end of the undrawn multifilament yarn in the package cage during processing (in progress) and the unstretched yarn in the package cage to be processed next. It is well known that the so-called tail transfer method, which connects the ends of multifilament yarns, allows continuous drawing and simultaneous false twisting, omitting the yarn threading operation when changing the package cage. As methods, various methods of tying the threads or a method of applying air turbulence to intertwine the threads are known. However, such a method has the following drawbacks and cannot be used for high-speed machining at a machining speed of 700 m/min or more. In other words, with the yarn knotting method, the strength of the knotted part can be expected to be sufficiently high, but when the yarn knot passes through the external friction false twisting device, the stretching tension changes and the As a result, it has the drawbacks of causing fluctuations in the drawing point, causing staining spots and abnormal crimp, and cannot be adopted. On the other hand, a method of connecting both multifilaments by applying air turbulence treatment to intertwine the rear end of the undrawn multifilament yarn to be processed first and the tip of the undrawn multifilament yarn to be processed next. According to the company, although the quality is good with no staining spots or crimp abnormalities, the strength of the joints is low and there are many variations in strength, so it is insufficient to withstand high-speed processing. Problems such as disconnection of the connection part during tail transfer and thread breakage have become apparent. The present inventors have conducted research to solve the above-mentioned drawbacks when tail transferring undrawn multifilament yarn by connecting yarns using the conventional yarn tying method and the yarn connecting method using air turbulence treatment. After connecting the rear end of the undrawn multifilament yarn to be processed first and the tip of the undrawn multifilament yarn to be processed next by applying air turbulence treatment, an adhesive treatment agent is applied to the connection part. By that,
Even in high-speed machining, there are no quality problems, and the strength of the connection part can be significantly improved.
The present invention was achieved by discovering that the convergence before and after the connecting portion can be improved. That is, in the present invention, when a thermoplastic synthetic fiber undrawn multifilament yarn is stretched and simultaneously false twisted to produce a crimped yarn, the trailing end of the undrawn multifilament yarn to be processed first and the rear end of the undrawn multifilament yarn processed first and then After the tips of the undrawn multifilament yarn to be processed are entangled with each other by air turbulence treatment, an adhesive treatment agent is applied to the entangled portion and both ends are connected, thereby allowing continuous drawing and simultaneous false twisting. This is a method for producing crimped polyester yarn, which is characterized by carrying out processing. Thermoplastic synthetic fibers to which the method of the present invention can be applied include all thermoplastic synthetic fibers that can be simultaneously stretched and false-twisted, such as polyester fibers and polyamide fibers. Furthermore, as the adhesive treatment agent used in the method of the present invention, a wide variety of treatment agents that are generally known as fiber sizing agents can be used, but water-soluble polyester is particularly suitable. Water-soluble polyester can be removed very easily by a simple water washing treatment, and particularly strong adhesive strength can be obtained when polyester fiber is used as the synthetic fiber. Water-soluble polyesters consist of dicarboxylic acids, alkylene glycols and difunctional compounds having SO ₃ M groups (M being hydrogen or a metal ion) and/or polyalkylene glycols. Dicarboxylic acid components are aromatic, aliphatic, and alicyclic dicarboxylic acids, including oxalic acid, malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, trimethyladipic acid, pimelic acid, 2.2 dimethylglutaric acid, Azelaic acid, sebacic acid, fumaric acid, maleic acid, itaconic acid, 1.3
Cyclopentanedicarboxylic acid, 1.2 cyclohexanedicarboxylic acid, 1.3 cyclopentanedicarboxylic acid, 1.4 cyclohexanedicarboxylic acid, phthalic acid, terephthalic acid, isophthalic acid, 2.5 norbornanedicarboxylic acid, 1.4naphthalic acid, diphenic acid, 4.4′ oxybenzoic acid, diglycolic acid ,
Examples include thiodipropionic acid, 4.4'sulfonyl dibenzoic acid and 2.5 naphthalenedicarboxylic acid, and among these, terephthalic acid and isophthalic acid are preferred. The alkylene glycol components include ethylene glycol, propylene glycol, diethylene glycol, 2.4 dimethyl 2 ethylhexane 1.3 diol, 2 ethyl 2 butyl 1.3 propane diol, 2.2 dimethyl 1.3 propane diol, 2 ethyl 2 isobutyl 1.3 propane diol, 1.3 butane diol, 1.4 butane. Diol, 1.5 Pentanediol, 1.6 Hexanediol, 2.2.4 Trimethyl 1.6 Hexanediol, 1.2 Cyclohexane dimethanol, 1.3 Cyclohexane dimethanol, 1.4 Cyclohexane dimethanol, 2.2.4.4 Tetramethyl 1.3
Cyclobutanediol, 4.4′thiodiphenol,
4.4′ methylene diphenol, 4.4′ (2-norbornylidene) diphenol, 4.4′ dihydroxybiphenol, o-, m- and p-dihydroxybenzene, 4.4′ isopropylidene diphenol, 4.4 isopropylidene bis(2.6 dichlorophenol),
Examples include 2.5 naphthalene diol and p-xylene diol, among which ethylene glycol and diethylene glycol are preferred. Examples of the polyalkylene glycol component include polyethylene glycol, polypropylene glycol, and the like. The role of polyalkylene glycol is to strengthen the bond between the fibers and the water-soluble polyester, and also to provide flexibility to the water-soluble polyester. Examples of the bifunctional compound component having a _-SO3M group (M is hydrogen or a metal ion) include _-SO3M group-containing dicarboxylic acid diols and oxyacids. M is Li ⁺ , Na ⁺ , K ⁺ , Mg ⁺⁺ , Ca ⁺⁺ ,
Examples include Cu ⁺⁺ , Fe ⁺⁺ and Fe ⁺⁺⁺ , with Na ⁺ and Li ⁺ being preferred. As a compound, the −SO ₃ M group is directly connected to an aromatic nucleus, and the general formula is (X is a trivalent aromatic hydrocarbon group, Y is a divalent aromatic hydrocarbon group, R is hydrogen or an alkyl group having 1 to 4 carbon atoms, M is hydrogen, Li ⁺ , Na ⁺ , K ⁺ , Mg ⁺⁺ , Ca ⁺⁺ ,
Cu ⁺⁺ , Fe ⁺⁺ or Fe ⁺⁺⁺ , a is 1, 2 or 3. ) (R is hydrogen, an alkyl group having 1 to 8 carbon atoms or a phenyl group, M is Na ⁺ , Li ⁺ , K ⁺ , Mg ⁺⁺ , Ca ⁺⁺ , Cu ⁺⁺ ,
Fe ⁺⁺ or Fe ⁺⁺⁺ , a is 1, 2 or 3. ), specifically metal salts such as sulfoisophthalic acid, sulfoterephthalic acid, sulfophthalic acid or 4-sulfonaphthalene 2.7 dicarboxylic acid, 4-sodiosulfophenyl-
3-5-dicarbomethoxybenzenesulfonate, 4-lithiosulfophenyl 3.5-dicarbomethoxybenzenesulfonate and 6-sodiosulfo-2-naphthyl 3.5-dicarbomethoxybenzenesulfonate, 5-[4-(sodiosulfo)-phenoxy]isophthal dimethyl acid, 5. [(sodiosulfo) phenoxy] dimethyl terephthalate, and 5. [4. (sodiosulfo) phenoxy] isophthalic acid. Among these, sodiosulfoisophthalic acid to which Na metal is bonded is particularly preferred. The composition and ratio of these are not particularly limited as long as the obtained polyester is water-soluble, but a copolymerized polyester of 20 to 40 mol% of sodiosulfoisophthalic acid is desirable. The resulting polyester has an intrinsic viscosity (IV) of 0.15
~0.5, it is a solid and stable polymer at room temperature, and when dissolved in water or hot water, it becomes transparent or in a suspended state. The adhesive treatment agent is applied to the tail connecting portion where the trailing end of the undrawn multifilament yarn to be processed first and the tip of the undrawn multifilament yarn to be processed next are intertwined with each other by applying air turbulence to the rear end. However, the application method may be by applying an aqueous solution of the adhesive treatment agent with a brush, or by a spray method or by impregnating a cloth or the like with the application, the effect remains the same. Furthermore, the adhesive treatment agent may be dispersed in the form of a mist in the air turbulent flow, and the air turbulence treatment and the application of the adhesive treatment agent in the form of a mist may be performed simultaneously. In the present invention, the amount of adhesive treatment agent applied is not particularly limited, and as long as the concentration of the treatment agent is 1 to 2% by weight or more, the purpose can be sufficiently achieved. Also, there is no need to pay special attention to the drying of the treated area, as long as the entanglement treatment and adhesive treatment are completed 3 to 5 hours before passing through the tail transfer connection area, which is normally done. good. As explained above, according to the present invention, a strong adhesive effect occurs between the fibers at the joints of multifilament yarns, the breaking strength of the joints shows a value equivalent to that of the unconnected parts, and the joints Because the front and back convergence can be improved, even when drawing and simultaneously false-twisting is performed at high speeds of 700 m/min or higher, there is no looseness, yarn breakage, or fluffing near the joint, and yarn breakage during tail transfer is greatly reduced. This makes it possible to perform continuous processing without reducing the operating rate of the machine due to yarn breakage, and it becomes possible to dramatically improve productivity. Furthermore, when special water-soluble polyester is used as an adhesive treatment agent, it is extremely easy to remove the treatment agent, and the treatment agent remains, causing problems such as dyeing spots during the dyeing and finishing process of false twisted yarn. I don't want something like that to happen. Hereinafter, the present invention will be explained in further detail with reference to Examples. Example 1 115 denyl/spun at a spinning speed of 3500 m/min
36-filament polyethylene terephthalate undrawn multifilament yarns were interlaced and connected together using air agitation and turbulence treatment, and various concentrations of water-soluble polyester or water-soluble acrylic ester glue were applied to the connected parts with a brush and left for 8 hours. After drying and solidifying, test the specimen with a length of 5 cm using an Instron tensile tester.
The stretching curve was measured under the conditions of 1000% stretching speed (with the connecting portion located at the center of the sample), and the cutting strength was determined from the stretching curve. The water-soluble polyester has an intrinsic viscosity of 0.35 and is obtained by reacting 20 parts by weight of 5-sodiosulfoisophthalic acid, 80 parts by weight of terephthalic acid, 76 parts by weight of ethylene glycol, and 5 parts by weight of polyethylene glycol (molecular weight 600). and, as the acrylic ester glue, Cytecs J-6 manufactured by Gooh Kagaku Co., Ltd. was used. The results are shown in Table 1. For comparison, the cutting strength was also measured for samples in which no adhesive treatment agent was applied to the yarn joints, and for ordinary yarns without yarn joints, and the results are also shown in Table 1. As is clear from Table 1, the strength of the yarn coated with water-soluble polyester or acrylic ester glue at the yarn joints remains the same as that of the non-connected parts, and this method is effective in increasing the strength of the yarn joints. It can be seen that it has a remarkable effect on increase.

[Table] Example 2 A polyethylene terephthalate undrawn multifilament yarn package of 10 kg of 115 denier/36 filaments melt-spun at a spinning speed of 3500 m/min was fed to a drawing and simultaneous false-twisting machine equipped with a circumscribed friction false-twisting device. Then, a false twisting process was carried out simultaneously with the stretching. The false twisting machine used was a Super Draw Set 8 model manufactured by Scruggs Co., Ltd., with a false twisting speed of 700 m/min and a stretching ratio of 700 m/min.
It was processed into a 5 kg package at a temperature of 1.52 times and the first heater temperature of 220°C. At this time, the rear end of the yarn of the undrawn yarn package to be processed first and the tip of the yarn of the undrawn yarn package to be processed next are aligned and subjected to air agitation turbulence treatment at a compressed air pressure of 5 kg/cm ² , After intertwining and connecting the constituent filaments of both yarns,
Various concentrations of water-soluble polyester were applied to the connection portion using a brush. As the water-soluble polyester, 20 parts by weight of 5-sodiosulfoisophthalic acid, 80 parts by weight of terephthalic acid,
A product with an intrinsic viscosity of 0.35 obtained by reacting 76 parts by weight of ethylene glycol and 5 parts by weight of polyethylene glycol (molecular weight 600) was used. On the other hand, for comparison, a similar test was conducted on a product in which water-soluble polyester was not applied to the connection portion. Table 2 shows the tail transfer permeability of the yarn and the quality of the crimped yarn. The total amount processed in each experiment was 10.8 tons.

[Table] As is clear from the above, the tail transfer performance of the yarn coated with water-soluble polyester is extremely good, and no adverse effects are observed on the quality of the connected portion. The tail transfer passage rate is defined as the point where the trailing end of the undrawn multifilament yarn to be processed first and the tip of the undrawn multifilament yarn to be processed next pass through the drawing and simultaneous false twisting processing device. This is the percentage of items that successfully passed without being cut during the passage.

Claims (1)

[Claims] 1. When a thermoplastic synthetic fiber undrawn multifilament yarn is stretched and simultaneously false twisted to produce a crimped yarn, the trailing end of the undrawn multifilament yarn processed first and the second By intertwining the tip of the undrawn multifilament yarn to be processed with each other by air agitation turbulence treatment, applying an adhesive treatment agent to the intertwined part and connecting the two ends,
1. A method for producing a crimped thermoplastic synthetic fiber yarn, which comprises continuous stretching and simultaneous false twisting. 2. The method according to claim 1, wherein the adhesive treatment agent applied to the entangled portion is water-soluble polyester.