JPH0532504B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for producing spun yarn using an air false-twist spinning method. (Prior art) After the roving is drafted into a fleece by a drafting device, it is guided to an air false twisting device to give a false twist, and while the short fiber bundle located in the center is false twisted, the fiber is Air false twisting is a technique that produces short fibers with substantially free ends around the bundle, and when untwisting the above false twisting, winds the outer unconstrained fiber group around the central fiber bundle to form a spun yarn. It is called the formula spinning method, and has recently attracted attention as an innovative spinning method that replaces the ring spinning method, and the inventions and ideas related to this method are credited to Tokko Sho.
Many inventions such as those described in Publication No. 56-31370 have been proposed. To specifically explain the structure of the spun yarn obtained by the air false twist spinning method, as described in the above publication, one end of the single fiber of the staple fiber bundle is located in the inner layer of the produced yarn, and the other end of the fiber is located in the inner layer of the produced yarn. exits to the outer layer of the produced yarn and is wound in a real twist, and each of the wound single fibers has the same arrangement direction, and the produced yarn having the above structure is The yarn surface is rough in one direction and smooth in the other direction. However, the yarn produced by the above-mentioned spinning method can be obtained by a spinning method similar to the ring spinning method, and as described in Japanese Patent Publication No. 59-7812, it is easy to spin coated yarns and composite yarns. Since the center is essentially untwisted, it is coarse and has various advantages such as good permeability to processing liquids. It is used for single spinning and mixed spinning of polyester/cotton, rayon/cotton, etc. (Problem to be solved by the invention) Practical machines such as the "Murata Jet Spinner (abbreviated as MJS)" manufactured by Murata Machinery Works exist as devices for carrying out this type of spinning method. Good results have not been obtained by simply spinning a roving containing wool fibers such as wool alone, polyester/wool, acrylic/wool, rayon/wool, etc. The reason for this is that the fiber length distribution of wool fibers is extremely asymmetric, ranging from a minimum of around 10 mm to a maximum of approximately 10 mm.
The length reaches around 250 mm, making it essentially unsuitable for the above-mentioned MJS, which mainly spins cotton fibers with high fiber length uniformity. I had no choice but to amputate it. In addition, as mentioned above, spun yarn produced by the air false twisting method has a special shape different from that of ordinary ring yarn, so the strength of the yarn depends on the winding of the outer layer fibers, and the number and type of fibers in the cross section vary. In the case of the same type of yarn, the yarn strength is naturally lower than that of ring yarn, the spinning quality is poor, and as a result, only a thick yarn can be obtained. The object of the present invention is to solve the above-mentioned problems that exist in spun yarns obtained by air false twist spinning, specifically, spun yarns obtained by MJS. (Means for Solving the Problems) The present invention has the following configuration to achieve the above object. That is, a fiber bundle of 100% wool obtained by the normal process of wool spinning and a fiber bundle of 100% polyester staple obtained by a tow reactor are mixed in a pre-spinning process to form a fiber bundle, and the fiber bundle is is supplied to a drafting device equipped with a hollow part in the middle roller, and then,
A method in which wool fibers are sequentially fed in an opened state from a front roller of a drafting device to an air-type turning device and a false twisting device whose rotation directions are opposite to each other to produce a spun yarn, and the wool fibers are The weight ratio is 30~70%, the weight ratio of polyester staple is 70%
Using a fiber bundle containing ~30%, the longest fiber length of the wool fiber is 120 mm or more, the average fiber length by Barbé method is 60 mm or more, and the fineness of the polyester staple is 2 denier or less, by Barbe method. This is a method for producing spun yarn by air false twisting, which is characterized by making the average fiber length 60 to 80 mm. The present invention will be specifically explained below with reference to embodiments shown in the drawings. (Example) First, the outline of the embodiment of the method of the present invention will be explained in the second section.
This will be explained using figures. In this embodiment, MJS is used as the implementation device. The device was actually published in 1973.
- As described in Publication No. 14376, the roving 2 pulled out from the Shinomaki bobbin 1 is sequentially passed through a pair of back rollers 3, a pair of middle rollers 5 with an apron 4, and a pair of front rollers 6 to form a fleece-like yarn. After that, the first air swirl nozzle 7, the untwisting pipe 8, the second
It passes through an air swirling nozzle 9 and a drawing roller 10, and is formed into a spun yarn Y shown in FIG. In this embodiment, in the well-known spinning process, a hollow roller 13 is specially used as a middle top roller in the draft device 12 shown in FIG. As shown in FIG. 4, the hollow roller 13 has a recess of an appropriate depth on the outer periphery of its working surface to form a hollow section 14, and the apron 4 is in contact with the outer periphery of this working surface. The depth of the hollow part 14 is determined by the thickness of the supplied roving. For example, if the wool is 30%
Sliver containing more than 0.4 or more unit weight
In the case of 0.8 g/m, 0.4 to 0.8 mm is appropriate. Specifically, certain worsted fibers 100
The fiber diagram of % is shown in Figure 5, and the longest fiber length reaches approximately 180 mm. In order to spin it with a conventionally known MJS machine, it is cut, for example, at the position indicated by the two-dot chain line X in the figure, and is made into a single or blended fiber. However, when such an operation is carried out, the long fibers in region A, which are the basis of yarn strength, are damaged and the yarn strength is inevitably reduced. In this embodiment, by using a hollow roller in the drafting device, the fiber diagram shown in FIG. 5 can be used as is without cutting. Therefore, in this example, the long fibers in region A are present in the obtained yarn as they are. The wool fibers used in the present invention must be worsted fibers, that is, the longest fiber length is 120 mm or more, and the average fiber length is 60 mm or more. In this case, the strength and quality of the yarn obtained are significantly inferior, and the spinning condition is also deteriorated, making it impossible to use. Therefore, the polyester staple to be blended with the wool fiber may be ordinary regular polyester fiber, anti-pill polyester fiber, super anti-pill polyester fiber, or polyester composite fiber in which two types of polyester are joined in parallel or eccentrically. etc. can be used. The above polyester fiber for blending must have a fine denier, preferably 2 denier or less, preferably 1.5
It must be less than denier. There are two methods of top making for obtaining the above-mentioned blended polyester fibers: a card method and tow spinning, and the latter method must be adopted in the present invention. The reason for this will be explained in detail below. When fine denier synthetic fibers are spun using a card method, they are inferior in terms of cleanliness such as neps, pinpoints, and slabs. In order to prevent this from decreasing, it is necessary to reduce the card rotation speed or supply amount, but even if this is implemented, there is a limit, and when high quality yarn is required such as wool blend products. It is not suitable for On the other hand, the fineness of polyester staples is thicker and is 2.5.
When it comes to denier, high-quality tops can be obtained using the card method, but for example, if this is mixed and spun with 65% wool (fineness 22.5μ) and 35% wool (fineness 22.5μ), in the case of MJS, it will be 50th (meter count) in terms of the number of constituent pieces. was the limit, and it was impossible to create a spun yarn thinner than this in terms of spinnability. As described above, the card method is not suitable for spinning polyester fibers for MJS, and tow spinning, especially spinning using a tow reactor, is necessary. The tow reactor method for top making has a higher production volume than the card method, and it is also possible to make tops with fibers of 2 denier or less, which are suitable for MJS spinning, while maintaining relatively good cleanliness and parallelism. Table 1 shows a comparison of the quality of the curd and tow reactor fried tops, and Table 2 shows a comparison of the obtained yarn quality.

【table】

[Table] As shown in Tables 1 and 2 above, tow spinning tops are better as tops for MJS spinning. Next, the fiber length and the like of the polyester fiber for wool blending will be explained. The weight ratio of polyester fiber and wool fiber is 30/70 to 70/30, preferably 50/50.
~Blend at a ratio of 65/35. If the amount of polyester fiber is less than 30% by weight and the amount of wool fiber exceeds 70% by weight, for example, even if the polyester fiber is 1.5 denier, the wool fiber is 21.5μ, and the count is 56, as mentioned above, the yarn The number of constituent fibers in the cross section is insufficient, and the spinning condition deteriorates. On the other hand, if the amount of polyester fiber exceeds 70% by weight and the amount of wool fiber is less than 30%, the wool's texture such as sliminess, flakiness, and stiffness will rapidly deteriorate, and the characteristics of wool blend yarn will be lost. be exposed. The fiber length of polyester fibers varies depending on the type of wool blended, yarn count, texture of the fabric, etc.
Bias cut with a short average fiber length of 60 mm (maximum 110 mm to minimum 20 mm), and a long one of 30 mm.
(maximum 160 mm to minimum 20 mm) is preferable; if it is shorter than this, the spinnability will deteriorate, and if it is longer, the symmetry with the wool will be lost and the yarn quality will deteriorate. A blended roving of wool fibers and polyester fibers as described above is produced, and this is spun using the apparatus shown in FIG. 2 to obtain the blended spun yarn Y shown in FIG. 1. The present invention will be further explained below using specific examples. (Specific example) 50% by weight sliver of wool fiber (average fiber diameter 22.5μ) manufactured through a normal process,
A sliver with an average fiber length of 70 mm obtained by cutting 1.5 denier polyester tow using a draft (tow reactor method) is blended at 50% by weight.
I got the 3.2nd sliver. This was passed through the MJS machine shown in Figures 2 and 3 in the form of double roving to produce a 64 count spun yarn. The depth of the hollow roller was 0.6 mm. The fiber length diagram of the blended sliver obtained by the barbé method shows that the longest fiber length is 181 mm and the average fiber length is 75 mm.
The roller gauge of the draft device is 82mm between the front roller 6 and cradle roller 13, and 112mm between the cradle roller 13 and back roller 3.
, and the total draft was multiplied by 40. Table 3 shows the yarn quality of the obtained 64 count spun yarn according to the present invention and the conventional 64 count spun yarn for comparison.

【table】

[Table] The single yarn strength and elongation in Table 3 are JIS L
1095, 7.5 Single yarn elongation strength and elongation rate (constant speed tension type tester, grip distance 50cm, tension speed 30cm/
min), U%, Thin (-50%), Thick (+
50%) and Neps (+200%) are measured using JIS L 1095 7.20 yarn unevenness method A and B. As understood from Table 3, polyester 1.5
The conventional method in which denier staples are made into slivers using a card method, mixed with other fiber slivers, and spun is inferior to the method using the tow method sliver of the present invention due to yarn unevenness. It became possible to manufacture things. (Effects of the Invention) As mentioned above, the present invention has a disadvantage of the air false-twisting spinning method - a disadvantage that worsted fibers cannot be used as they are.
By solving this problem, it becomes possible to incorporate the long fibers unique to wool into the spun yarn as they are. In addition, the yarn obtained by the method of the present invention has excellent textures such as sliminess, flakiness, and stiffness that wool fibers originally have, as well as pleatability when woven and knitted.
It has wrinkle resistance and dimensional stability, as well as the low cost of air-false-twisted spun yarn, and will further expand the effectiveness of innovative spinning.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of the thread obtained by the method of the present invention, FIG. 2 is an explanatory diagram showing the entire apparatus for carrying out the method of the present invention, and FIG. 3 is a perspective view showing the main parts of the apparatus. 4 is a plan view showing the hollow roller, and FIG. 5 is a diagram of the worsted fiber. DESCRIPTION OF SYMBOLS 1... Shinonaki bobbin, 2... Roving, 3... Batch roller pair, 4... Apron, 5... Middle roller pair, 6... Front roller pair, 7... First air swirl nozzle, 8 ... Untwisting pipe, 9 ... Second air swirl nozzle, 10 ... Pulling roller, 11 ...
...Package cage, 12...Draft device, 13...
Hollow roller, 14... Hollow portion.

Claims (1)

[Claims] 1 Wool obtained by the normal process of wool spinning
A fiber bundle of 100% and a fiber bundle of 100% polyester staple obtained by a tow reactor are blended in a pre-spinning process to form a fiber bundle, and the fiber bundle is provided with a hollow part on a middle top roller. A method of supplying the fibers to a draft device, and then sequentially supplying the fibers in an opened state from the front roller of the draft device to a pneumatic turning device and a false twisting device whose rotation directions are opposite to each other to produce a spun yarn. , as the blended fiber bundle, the weight ratio of wool fibers is 30 to 70%,
A fiber bundle containing 70 to 30% by weight of polyester staples is used, and the longest fiber length of the wool fiber is 120 mm or more, and the average fiber length by barbé method is 60 mm.
mm or more, the fineness of the polyester staple is 2 denier or less, and the average fiber length by barbé method is 60 to 80 mm.