JPS6323295B2 - - Google Patents

Description

[Detailed description of the invention]

In the present invention, water or a liquid containing water as a main component (hereinafter referred to as water or aqueous liquid) is attached to a bulky processed yarn of thermoplastic synthetic fibers, and then heat-treated to extend the yarn along the longitudinal direction. The present invention relates to a method for producing a specially processed yarn having intermittent bulky parts and low bulky parts. In recent years, woven and knitted fabrics made from synthetic fiber filament yarns have become increasingly popular in clothing due to their excellent properties such as wash-and-wear properties, elasticity, and wrinkle resistance, and are particularly noticeable in the fields of casual and sports clothing. There is. however,
In addition to its excellent functionality, woven and knitted fabrics made from synthetic fiber filament yarn have a cold appearance and a waxy feel due to the uniformity and flatness of the yarn, giving the fabric an expressionless feel. This is said to be the reason why people don't like it. Conventionally, from this perspective, liquid treatment has been applied to eliminate the uniformity and flatness of multifilament yarns, and to create filament yarns that have bulkiness or uneven thickness in the longitudinal direction of the yarn. Suggestions have been made to obtain. For example, while the yarn is running, an oscillation device applies vibrational energy, the yarn itself is vibrated within a certain range, and the yarn is passed through while vibrating. A method of contacting and eliminating the bulkiness of the yarn portion (Japanese Patent Publication No. 39-19096),
A method in which a solvent, etc. is intermittently applied to the bulky processed yarn while it is stretched, and then heat treatment is applied, thereby causing the bulkiness of the attached areas to be lost.
26161) etc. are cited as representative examples.
However, these conventional techniques use a dissolving agent, a swelling agent, an adhesive, etc. for the supplied yarn, and the yarn portion to which these treatment agents are attached loses the bulkiness of the supplied yarn, resulting in a straight non-linear shape. Since this is a bulky area, it is extremely important and difficult to select and use a treatment agent, and in reality, this creates areas where the yarn strength is extremely weak, which can cause problems during the yarn manufacturing process and weaving and weaving process.
Frequent yarn breakage or deterioration in the strength of the woven or knitted product was observed, and the threads were thinner at the part where the treatment agent was attached and the degree of convergence was significantly different, resulting in a significant lack of stability in the quality of the woven or knitted product. be. Furthermore, since the time factor is greatly involved in the processing effect, the production rate is limited, and the cost of the obtained yarn is therefore relatively high. In addition, there is concern that residual solubilizing agents and swelling agents may adversely affect post-processes and textile products. As a solution to the above-mentioned drawbacks, JP-A-48-
Publication No. 22744 discloses a method in which a strong tension is intermittently applied to a crimped yarn, the yarn is heated at the same time, and the heated portion is heat-set in a taut state to alternately develop crimped and non-crimped portions. Proposed. This method heat-treats the yarn intermittently by reciprocating the heater, so when forming various patterns, especially patterns with short heating sections, there are restrictions on the shape of the heater, and it is necessary to shorten the heater. . However, in order to provide a sufficient heat-receiving effect with a short heater, it is necessary to increase the heater temperature, which tends to damage the yarn.If the heater temperature is lowered to avoid damage, the heat-receiving effect becomes poor and the yarn is heated. The disadvantage is that it is not possible to clearly distinguish the difference in form between the heating section and the non-heating section. Furthermore, in the method in which the yarn is intermittently brought into contact with the heater, only one side of the yarn is heated, so there is a problem that there is a tendency for differences in heat reception on both sides of the heating section, resulting in the formation of uneven shapes within the heating section. Furthermore, since the heater is an open system exposed to the outside air, temperature control is difficult and a large amount of heat is released to the outside, which is economically disadvantageous. Furthermore, since the above method applies strong tension intermittently, the heat-treated part becomes raw silk-like with no crimps, and the non-heat-treated part is subjected to strong tension and then becomes untensioned, resulting in the supply yarn having no crimps. Since the bulky part is more bulky than the bulky part, the quality of the bulky part changes depending on the tension state, and furthermore, the raw silk-like part has the disadvantage that it gives the fabric a cold appearance and a waxy texture. The present invention aims to provide a method for manufacturing a specially processed yarn having bulky parts and low bulky parts intermittently along the longitudinal direction of the yarn, which is made of a thermoplastic synthetic fiber multifilament yarn and eliminates such conventional drawbacks. This is the purpose. In order to achieve this object, the present invention has the following configuration. In other words, water or an aqueous liquid is intermittently applied along the longitudinal direction of a bulky processed yarn of thermoplastic synthetic fibers by an appropriate method, and then the yarn portions to which water or an aqueous liquid is applied are treated as bulky parts. The gist is that the remaining yarn portion is heat-treated at an overfeed rate of 3% or more so as to form a low bulky portion with substantially lower bulkiness than the bulky portion. The present invention will be explained in detail below. When carrying out the present invention, the bulky textured yarn is preferably untwisted or lightly twisted, and the aqueous liquid preferably contains 98% by weight or more of water. In the yarn obtained by the present invention, the bulky portion refers to a portion of the yarn where the bulkiness of the supplied yarn is clearly observed to remain even after the treatment of the present invention as described above by visual observation. In order to make this more concrete, we attempted to quantify it.Although there are some differences depending on the yarn supplied, when Db/Da≧0.8, it is recognized that bulkiness has remained sufficiently even when observed with the naked eye. It was hot. Da here,
Db is as follows. Da: Average diameter of the supplied yarn when a load of 1/100 g/d is applied in the yarn axis direction (unit: 1/100 mm).
Measure at 100 arbitrary locations. Db: Average value (unit: 1/100 mm) of the maximum diameter of the bulky portion (portion to which water or aqueous liquid is attached) when a load of 1/100 g/d is applied to the yarn after the treatment of the present invention in the yarn axis direction. Measured at 100 arbitrary bulky areas. Furthermore, the low bulk portion as used in the present invention refers to a thread portion that is clearly less bulky than the bulky portion when observed with the naked eye. There are some differences depending on the supplied yarn, but when Db/Dc≧1.4, it is clear that the bulkiness of the low bulk part (the part of the yarn to which water or aqueous liquid is not attached) is higher even when observed with the naked eye. was found to be lower than that of the bulky part (thread part to which water or aqueous liquid was attached). Dc: Low bulk part (yarn part to which water or aqueous liquid is not attached) when a load of 1/100 g/d is applied to the yarn after the treatment of the present invention in the yarn axis direction
Average diameter (unit: 1/00mm). Measure at 100 arbitrary locations. The present invention will be explained in more detail below. The heat treatment of the present invention is carried out so that the effect of the heat treatment does not reach or is extremely small on the yarn portion to which water or aqueous liquid is attached, thereby allowing the bulkiness of the bulky textured yarn to be supplied to remain. The heat treatment must be carried out in such a way as to impart the effect of the heat treatment to the high bulk part and the other thread parts, so as to create a low bulk part with reduced bulkiness compared to the bulk part. In order to perform heat treatment in this way, heat treatment conditions must be selected such that the yarn portion to which water or aqueous liquid is attached is still in a wet state immediately after heat treatment, and the other yarn portions are low bulk. This is desirable. Examples of such heat treatment conditions include polyester,
For polyamide (nylon 6) 70 to 200 denier single-stage heater false twist crimped yarn, the heater temperature is 140 to 200℃ (nylon 6), 170 to 250℃.
(polyester) and heat reception time is 0.25 to 0.40.
By performing dry heat treatment under conditions of 2 seconds, the yarn portion to which water or aqueous liquid is attached becomes a bulky portion that retains the bulkiness of the supplied yarn, and other yarn portions, that is, water or aqueous liquid, become bulky portions that retain the bulkiness of the supplied yarn. In the case of the yarn portion to which the yarn is not attached, the desired yarn is obtained as a low-bulk portion with clearly lower bulkiness than the bulky portion. At this time, the adhesion amount of water or aqueous liquid is adjusted so that the attached yarn part is still in a wet state immediately after the heat treatment, but it can be adjusted according to the contact time of the bulky processed yarn and the liquid, the contact surface area, etc. can be done. The present inventors have conducted various studies to ensure that the bulkiness of the supplied yarn remains effectively in the yarn obtained by the present invention, and have determined the overfeed rate during heat treatment. was found to be effective. Table 1 shows an example of the experimental results, and this experiment was conducted using the very common polyester false-twisted bulky yarn, nylon 6 false-twisted bulky yarn, and polyester fluid-treated bulky yarn (so-called Taslan bulky yarn). Water is intermittently applied to these yarns using a gear-type rotating roller, followed by dry heat treatment (temperature 200℃, heat reception time 0.6
seconds, non-touch type heater, yarn speed 100m/min)
The overfeed rate in the dry heat treatment area was changed when this was carried out. The bulkiness obtained by observation of the yarn is as shown in the table, and as is clear from these results, in order to effectively retain the bulkiness of the supplied yarn in the water-attached area, 3% It is preferable to perform the dry heat treatment under the above overfeed rate. When the overfeed rate is less than 3%, the bulkiness of the water-attached portion tends to be generally lower than the bulkiness of the supplied yarn, and at the same time, the effect of imparting thickness to the yarn tends to be inferior. Incidentally, the overfeed rate here is determined by the following. A-B/A×100 (unit: %) A: Supply speed (m/min) B: Pick-up speed (m/min)

[Table] (Note) ◎: The bulkiness is the same as that of the supplied yarn ○: The bulkiness is lower than the bulkiness of ◎ above △: The bulkiness is lower than the bulkiness of ○ above Bulking processing used in the present invention The yarn may be manufactured by any method as long as it has substantial bulkiness; for example, false twisting method (spindle type, friction type, etc.), real twisting method (Italian twisting method, etc.) Of course, it can also be applied to bulky processed yarns produced by fluid processing methods (taslan method, interlacing method, etc.), abrasion method, gear forming method, push forming method, etc., and also to reveal latent crimped yarns. It may be a drawn textured yarn (POY→DTY) obtained from a semi-undrawn yarn by a high-speed spinning method. Further, it is preferable that the bulky processed yarn is untwisted or lightly twisted. In other words, when water or an aqueous liquid is applied to a bulky processed yarn with many twists, the adhesion of water or an aqueous liquid,
Due to poor permeability, adhesion spots are likely to occur. Therefore, the resulting yarn tends to be a yarn in which the difference in bulkiness, thickness, etc. between the portion to which water or aqueous liquid is attached and the portion to which it is not are relatively similar. Further, there are cases in which the effect of the attached water or aqueous liquid, that is, the effect of maintaining the bulkiness of the supplied yarn, is not observed at all. The number of twists of the bulky textured yarn is preferably 0 to 300 T/M for yarns less than 100 denier, and 0 to 200 T/M for yarns of 100 to 300 denier. . As is clear from the above explanation, in the present invention, water or aqueous liquid is not used for the purpose of reducing or eliminating bulkiness of bulky textured yarn, but for the purpose of maintaining bulkiness. It is used with this in mind. That is, in the present invention, the yarn portion to which water or an aqueous liquid is attached becomes a bulky portion, and the other yarn portions become a low bulky portion with substantially lower bulkiness than this bulky portion. be. Therefore, the aqueous liquid used in the present invention must not itself have the effect of substantially reducing or eliminating the bulkiness of the bulky textured yarn. In this respect, it is completely different from the intention of the prior art in this field. Liquids that are clearly lower than those in the yarn portion (for example, the above-mentioned Japanese Patent Publication No. 39-19096 and No. 39-1909)
Liquids such as those disclosed in Japanese Patent No. 26161) are not applicable to the present invention. The aqueous liquid referred to in the present invention is one that contains a majority of water (50.1% by weight or more) by weight, and representative examples of substances other than water include surfactants, oils and fats, etc. However, as mentioned above, the bulkiness of the bulky textured yarn is substantially reduced,
Any aqueous liquid may be used as long as it does not have the effect of causing it to disappear. Water is most preferable from a practical point of view, but when using an aqueous liquid containing 98% by weight or more of water, although there are differences due to additives other than water, compared to the above-mentioned conventional technology, It is advantageous in terms of production cost and production speed, and the deterioration of the working environment (smoke, deposits, etc.) is greatly improved, resulting in sufficient operational productivity. Substances added to the aqueous liquid system at this time include colorants for classifying yarn lots, surfactants to improve water adhesion, and rust preventive agents to prevent rust in machinery, etc. , added at 2% by weight or less. In the present invention, any method may be used to attach water or an aqueous liquid to the bulky textured yarn as long as it can be applied intermittently. For example, the adhesive is attached using a gear type rotating roller having protrusions on the roller surface. The method of the present invention may be applied to a bulky textured yarn obtained by subjecting it to bulking process in advance, or may be carried out continuously with bulking process. FIG. 1 is a schematic diagram of an example of an apparatus for carrying out the present invention, which performs the false twist bulking process and the process of the present invention in succession. In FIG. 1, raw yarn (for example, ordinary drawn yarn) 1 to be supplied to the false twist bulking process passes through a feed roller 2, is heated by a first heater 3, is false twisted by a false twist spindle 4, and is subjected to the bulk process. Thread is obtained. After passing through the first delivery roller 5, water or an aqueous liquid is intermittently deposited along the longitudinal direction of the bulky processed yarn in an adhesion device 6, and a second heater 7 (heating heater)
Heat treatment is performed to form a bulky portion and a low bulky portion in the longitudinal direction, and the sheet is wound up via the second delivery roller 8. 9 is a winding roller, and 10 is a winding cheese. The adhesion device 6 consists of a gear-type rotating roller with a plurality of protrusions intermittently protruding from the roller surface and a bath of water or an aqueous liquid, and processes the water etc. adhering to the protrusions of the rotating roller into bulk. It attaches to the thread. In the present invention, an aqueous liquid is intermittently applied to the bulky processed yarn, and then heat treatment is performed at an overfeed rate of 3% or more, so that the entire yarn retains its bulkiness and is processed to have bulky parts and low bulky parts. It is possible to manufacture yarn, there is no variation in the quality of bulky parts due to tension fluctuations, and it is possible to maintain a certain degree of bulkiness even in low-bulk parts, so there is no problem of giving the fabric a cold appearance or waxy texture. do not have. Furthermore, since the processed yarn coated with the aqueous liquid is continuously heat-treated, there are no restrictions on the shape of the heater, unlike when heating is performed intermittently. Therefore, since heating can be performed in a closed system such as the second heater of the false twister, it is possible to uniformly heat the non-liquid-attached portion and impart bulkiness according to the set pattern. Furthermore, since the heat treatment can be performed under conditions comparable to the normal two-heater false twisting conditions, there is no damage to the yarn, and furthermore, there is no reduction in thermal efficiency due to heat release. Furthermore, unlike conventional methods, there are no parts where the yarn strength is extremely low, and there is no yarn breakage or strength deterioration when fabricated into woven or knitted fabrics. It is also possible to obtain yarn with little variation. Furthermore, there is an advantage that there is no trouble caused by residual processing agents such as solubilizers and swelling agents as in conventional methods. Example A normally drawn polyester yarn of 75 denier 36 filament was loaded into the apparatus shown in FIG. 1, and bulk crimping and the method of the present invention were continuously performed under the conditions shown in Table 2. Table 3 shows the properties of the obtained yarn and the properties of woven and knitted fabrics made of this yarn alone. The obtained yarn has bulky parts y and low bulky parts z, which are lower in bulk than the bulky parts, alternately along the longitudinal direction of the yarn, as shown in Fig. 2, and the obtained woven fabric is as if spinning. It appeared to be a type of woven fabric, and the yarn irregularities in the knitted fabric were even more pronounced than in the woven fabric.

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【table】 [Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an example of an apparatus for implementing the present invention, and FIG. 2 is an enlarged schematic diagram of an example of a yarn obtained by the present invention.

Claims (1)

[Claims] 1. Water or a liquid containing water as a main component is intermittently applied to a bulky processed yarn of thermoplastic synthetic fibers along its longitudinal direction, and then water or a liquid containing water as a main component is applied thereto. The attached yarn portion remains as a bulky portion, and the other yarn portions are heat-treated at an overfeed rate of 3% or more so as to become a low bulky portion with substantially lower bulkiness than the bulky portion. A method for producing specially processed yarn characterized by the following. 2. The method for producing a special textured yarn according to claim 1, wherein the bulky textured yarn is a non-twisted or lightly twisted bulky textured yarn. 3. The method for producing specially processed yarn according to claim 1, wherein the liquid containing water as a main component is a liquid containing 98% by weight or more of water.