JPH0347337B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a stretchable spun yarn and a method for producing the same, and more specifically, the present invention relates to a stretchable spun yarn and a method for producing the same, and more specifically, the present invention relates to a stretchable spun yarn and a method for producing the same. The present invention relates to a spun yarn with a novel structure that allows for the production of the same. [Prior art and its problems] In order to improve the properties of spun yarn itself and increase added value, spun yarn is used in a composite form by twisting or pulling together with synthetic fiber filament yarn (long fiber yarn). is well known. In recent years, stretchability has been required even in knitted fabrics using spun yarns, and for this reason, stretchable coated spun yarns are created in which a synthetic fiber yarn with stretchability is used as a core yarn, and the core yarn is twisted and covered with spun yarn as a sheath yarn. is attracting attention. Typical manufacturing methods for this type of covered spun yarn include:
A covering device using a hollow spindle is used to twist the spun yarn around the outer periphery of a stretchable long fiber core yarn, and a spinning machine uses a core spun method to spin the stretchable long fiber core yarn into a sheath yarn. A method of arranging it at the center of the thread is known. However, although these methods using covering devices or spinning machines yield coated spun yarns with sufficiently excellent covering properties and stretch properties, the covering process is generally slow and has major drawbacks in terms of productivity and cost. . To solve this problem in productivity, there is a method in which thermoplastic synthetic fiber yarn or polyurethane elastic yarn and spun yarn are aligned and subjected to false twisting at the same time. However, the coated spun yarn obtained by this method has the disadvantage that the core yarn is not sufficiently covered by the spun yarn, resulting in extremely poor covering properties and stretchability. There is also a method in which stretchable long fiber yarns and spun yarns are supplied to a fluid nozzle and subjected to fluid entanglement treatment under special conditions. in this way,
Although it can be said to have the best productivity among the conventional techniques in terms of speed-up, at present, even this method has not been able to provide satisfactory coverage and stretchability. In other words, even though the coated spun yarn produced by the entanglement treatment shows good covering properties under substantially no tension or very slight tension, it is generally not as good as that used in high-order processing processes. There is a problem in that when tension is applied, the part where the stretchable filament yarn and the spun yarn are intertwined and bundled in the longitudinal direction of the yarn tends to be destroyed and completely separated, resulting in a non-binding part. Therefore, when such yarns are used to make knitted fabrics, due to insufficient covering properties, so-called eye spots and wrinkles are frequently observed, and in general, low-grade yarns with poor appearance are observed. The reality was that only 100% of products could be obtained. [Object of the Invention] In view of the above-mentioned points, the object of the present invention is to provide a material that has good stretchability and excellent covering property, has a higher processing speed than similar conventional products, and can be manufactured at low cost. The object of the present invention is to obtain a stretchable spun yarn having a novel structure capable of providing the same, and to provide a method for producing the same. [Structure of the Invention] The present invention, which achieves the above object, has the following structure. That is, the present invention provides a yarn in which a synthetic fiber yarn having stretchability is used as a core yarn, and a spun yarn is twisted and covered around the core yarn as a sheath yarn, and the spun yarn is twisted in the S direction and the Z direction. In addition to exhibiting an alternating twist state, the convergence point covered with twists in the longitudinal direction of the yarn is the part where the fuzz of the spun yarn and the stretch yarn that becomes the core yarn are entangled due to air entanglement treatment (hereinafter referred to as It is characterized by a stretchable spun yarn that has intermittent interlacing and convergence points. In addition, the method of the present invention for producing the stretchable spun yarn includes supplying the stretchable synthetic fiber yarn and the spun yarn to a twisting device at the same time and applying false twisting to the stretching yarn. The invention is characterized in that the spun yarn is twisted and coated on a synthetic fiber yarn having a property of properties, and that the twisted coated yarn after passing through the twisting device is immediately subjected to a fluid entanglement treatment without using a delivery roller or the like. It is. Preferred embodiments of the present invention will become apparent in the following description. Hereinafter, the present invention will be explained in more detail using drawings and the like. FIG. 1 is a schematic side view showing a model of the stretchable spun yarn of the present invention. In FIG. 1, 1 is a synthetic fiber yarn having stretchability, and 2 is a spun yarn. The spun yarn 2 is twisted with respect to the stretchable synthetic fiber yarn 1 in an alternating state of twisting in the S direction and twisting in the Z direction. 3 shows the reversed part of the twist. The stretchable spun yarn of the present invention has such a structure, and is further characterized in that it has intermittently interlaced convergence points 4 by interlacing or the like in the longitudinal direction of the yarn, and is twisted in such an alternately twisted manner, In addition, since it has intermittent strong interlacing and convergence points, even if the stretchable spun yarn is subjected to stress during high-order processing, the covering property of the spun yarn is not easily destroyed and is maintained well. It will be done. As mentioned above, the twist coverage and the presence of interlacing and convergence points are important factors for determining the coverage of the stretchable spun yarn of the present invention. In the stretchable spun yarn of the present invention, the indicated denier of the stretchable synthetic fiber yarn 1 serving as the core yarn x 2 mg/d
80 pieces/m under a load equivalent to
It is preferable to have the above-mentioned intertwined convergence points, so that the intertwined convergence points can be prevented from being destroyed even if strong tension and relaxation actions are repeated. Furthermore, in the present invention, it is necessary that the stretchable spun yarn covered with the spun yarn has elasticity, that is, stretchability, and the degree of stretchability is 10 to 10.
Preferably it is 30%. The stretchable synthetic fiber yarn used in the present invention may be made of an elastic body such as synthetic rubber, polyester polyurethane, polyether polyurethane, or polyester or polyamide. It is possible to use synthetic fiber filament systems such as polybutylene fibers which have been appropriately crimped to give them elasticity. Further, the material, fineness, cross-sectional shape, number of filaments, etc. are not particularly limited. On the other hand, the spun yarn used in the present invention is a spun yarn made of natural fibers, synthetic fibers, or a mixture thereof, and usually does not have stretchability. As a representative fiber, a spun yarn having long fluff and synthetic fibers such as polyamide, polyester, or polyacrylic fibers is preferable. Next, a method for producing stretchable spun yarn according to the present invention will be explained. FIG. 2 is a process schematic diagram showing an example of the method for manufacturing stretchable spun yarn of the present invention. Via
The twisted coating zone A is supplied. The spun yarn 2 supplied from the delivery roller 11 to the A zone is supplied to the delivery roller 15 in an overfeed state, and at the same time, the spun yarn 2 is supplied to the A zone.
In the zone, synthetic fiber yarn 1 with stretch properties,
For example, an elastic fiber yarn or a false twisted crimped yarn made of polyurethane or the like is supplied through a supply roller 12 in a substantially constant elongated state, and is supplied to the twisting device 13 together with the spun yarn 2. Ru. The twisting device 13 may be of any type as long as it can impart a normal false twist, such as a normal spindle pin type or friction type false twisting device, or a fluid injection swirling nozzle that sprays a swirling fluid stream. The false twisting method can be used without any particular limitation. but,
It is preferable to use the appropriate one depending on the type of synthetic fiber yarn and spun yarn having stretch properties used. Therefore, for example, when the fineness of the synthetic fiber yarn having stretchability is large, for example, 40D or more, a spindle type false twisting device is suitable, and when the fineness is small, for example, 30D or less, a fluid jet twisting device is suitable. It is appropriate to use a nozzle. The synthetic fiber yarn 1 having stretchability, which has been stretched to a certain extent together with the spun yarn in this way, is supplied to the twisting device 13, and by applying false twist, the synthetic fiber yarn 1 having stretchability is turned into a core yarn. As,
The spun yarn 2 is twisted around the yarn to form a yarn with a covering structure. At this time, the heating heater for twist setting is not used in the A zone. The twisted coated yarn leaving the twisting device 13 is immediately sent to the fluid entanglement processing nozzle 14 without passing through a delivery roller or guides.
will be introduced in This step constitutes the most important part of the invention. The false twist imparted by the twisting device 13 here generally reaches an untwisting point immediately after leaving the twisting device 13 and is untwisted all at once. However, because the core yarn is a synthetic fiber yarn with stretchability, and because the spun yarn being twisted is supplied with a large amount of overfeed, the untwisting point cannot be determined at one point, and the untwisting point cannot be determined immediately after that. Since interlace processing is applied to the fibers, the untwisting points become uneven due to vibrations caused by air pressure, thereby preventing untwisting. Therefore, interlaced convergent portions and non-entangled portions having alternating twists occur at fine pitches in the longitudinal direction of the yarn. As mentioned above, the frequency of entangled convergence points is preferably 80 pieces/m or more under a constant load, and it is desirable to set the twisting and interlace processing conditions so as to satisfy this condition. When implementing the method of the present invention, the fluid entanglement treatment nozzle 14 that performs the interlacing process is placed between the twisting device 13 and the delivery roller 15, and is placed as close to the twisting device 13 as possible, that is, to perform the untwisting action. It is desirable to provide it in a position where it can be blocked. In such a position, the twisting device 13
It is most effective to install it within 20cm from immediately downstream of the The yarn exiting the fluid entanglement treatment nozzle 14 passes through a delivery roller 15 and a guide 16 and is delivered to the winding roller 1.
7, the package is wound up into a package 18. In the above-mentioned process, the delivery roller 11
The feed rate of the spun yarn 2 between and 15 is preferably within the range of +3 to +20% relative to the speed of the delivery roller 15. Furthermore, it is desirable that the stretchable synthetic fiber yarn 1 sent out from the delivery roller 12 is supplied to the twisting device 13 with an appropriate elongation rate set according to the characteristics of the fiber. The stretchable spun yarn of the present invention has 80 or more entangled convergence points/m under a load of 2 mg/d relative to the indicated denier of the stretchable synthetic fiber yarn serving as the core yarn, and the convergence portions are arranged alternately. It exhibits a twisted state and has a stretch property of 10 to 30%, so that the interlacing and convergence points will not be damaged even by strong tension or relaxation effects that are applied in the fabric manufacturing process such as knitting and fabrics. When processed into a knitted fabric, this stretchy spun yarn actually has good stretchability and can be made into a high-quality fabric without any irritation or so-called graininess. In addition, the stretch property as used in the present invention is defined as the length when an initial load of 2 mg/d is applied to the stretchable spun yarn, and _the length when a constant load of 0.1 g/d is applied. It is calculated by the following formula, where l is ₁ . Stretchability=l ₁ −l ₀ /l ₀ [Example] 400% as a synthetic fiber yarn with stretchability
40D polyurethane elastic yarn, polybutylene terephthalate (PBT) false twisted yarn (75D), and polyamide false twisted yarn (70D) with elongation of
Covering was carried out by the process shown in FIG. 2 using each seed and a 50 count polyester/cotton blend spun yarn as the spun yarn. Table 1 shows the main processing conditions and the yarn properties of the stretchable spun yarn obtained.

【table】

〔Effect of the invention〕

As described above, the stretchable spun yarn of the present invention and the method for producing the same have good stretch properties and excellent covering properties, and can be produced at high processing speed and at low cost compared to conventional similar products. Provided are a stretchable spun yarn having a novel structure that allows for this, and a method for producing the same. Furthermore, the stretchable spun yarn of the present invention can be used as an excellent material for golf pants, uniforms, ski pants, etc.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing a model of the stretchable spun yarn of the present invention. FIG. 2 is a process schematic diagram showing an example of the method for manufacturing the stretchable spun yarn of the present invention. 1...Synthetic fiber yarn having stretchability, 2...
...Spun yarn, 3... Reversed part of twisting, 4... Interlacing and convergence point, 11, 15... Delivery roller, 13
...Twisting device, 14...Fluid entanglement processing nozzle.

Claims (1)

[Scope of Claims] 1 A yarn consisting of a synthetic fiber yarn having stretchability as a core yarn, and a spun yarn covering the core yarn as a sheath yarn in a twisted manner, wherein the spun yarn is twisted in the S direction and in the Z direction. A stretchable spun yarn exhibiting an alternating twist state and having intermittently intertwining and convergence points of the fluff of the spun yarn and the core yarn in the longitudinal direction of the yarn. 2 Under a load of the indicated denier of the core yarn x 2 mg/d, it has 80 or more entangled/converging points/m, and
The stretchable spun yarn according to claim 1, having a stretchability of 10 to 30%. 3. A synthetic fiber yarn having stretchability and a spun yarn are simultaneously supplied to a twisting device and false twisting is applied to the synthetic fiber yarn having stretchability, and the spun yarn is twisted to cover the synthetic fiber yarn having stretchability. A method for producing a stretchable spun yarn, characterized in that the twisted covered yarn after passing through a twisting device is immediately subjected to a fluid entanglement treatment without using a delivery roller or the like. 4. The method for producing stretchable spun yarn according to claim 3, wherein the spun yarn is fed to a twisting device at an overfeed rate of 3 to 20%.