JP2550132B2 - Hemp / rayon / polyester blended yarn by false twisting method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a novel spun yarn composed of polyester fiber, rayon fiber and hemp fiber, and in particular, a spring produced by an air false twist spinning method. The present invention relates to a blended yarn suitable as a material for summer clothing.

[Conventional technology]

After drafting the roving with a drafting device to make a fleece, this is introduced into an air false twisting device to impart false twist, and while performing false twisting on the short fiber bundle located at the center, Create a group of fibers with a substantially free end around,
The technology of forming the spun yarn by winding the outer unconstrained fiber group around the central fiber bundle when untwisting the false twist is called the air false twist spinning method, which is one of the innovative spinning methods that replaces the ring spinning method. Recently, it has attracted attention, and many inventions and inventions related thereto are disclosed in many documents including Japanese Patent Publication No. 56-31370.

The structure of the spun yarn obtained by the air false twisting spinning method will be specifically described. As described in the above publication, a part of the single fiber of the staple fiber bundle has one end in the inner layer portion of the yarn main body. It exists in a state in which it is locked and the other end is wound around the outer layer portion of the thread main body, and each wound monofilament is oriented in a fixed direction with respect to the length direction of the thread, so that the thread is squeezed In this case, the yarn surface is rough in one direction and smooth in the other direction. Compared with other innovative spinning yarns, this yarn has characteristics relatively similar to those obtained by the conventional ring spinning method, and is easy to spun as a coated yarn or a composite yarn (Japanese Patent Publication No. 59-7912), and the central part of the yarn is substantially non-twisted, rich in voids, and has good permeability of the processing liquid, so it should be applied to spinning of various fibers. Much research is underway.

[Problems to be Solved by the Invention]

As a practical machine for carrying out the air false twist spinning method,
"Murata Jet Spinner" (abbreviated as MJS) by Murata Machinery Co., Ltd. is currently on the market, but this was developed mainly for wire fibers with a relatively short fiber length.
There are still many problems to be solved in spinning yarns containing long fibers such as hemp fibers.

That is, since hemp fiber is composed of fibers having a fiber length distributed in a wide range from 10 mm to 250 mm, MJS developed for cotton fiber having a relatively high degree of uniformity of fiber length.
Even if a fiber bundle containing hemp fibers is set as it is, good spun state and yarn characteristics cannot be expected. As a convenient method, a method has been proposed in which hemp fiber is cut to make it have a fiber length distribution similar to that of cotton fiber, and then spun. It is not preferable because the texture is lost. This is because excessive wrapping fibers are generated with the increase in the number of fiber tips, and the yarn is hardened to give an excessive squeaky feeling. It is also a fatal drawback for clothing.

Further, as schematically shown in FIG. 1, the yarn obtained by the air false twist spinning has a structure different from that of the yarn obtained by the ring spinning, and has a substantial real twist. Since most of the yarn strength depends on the outer layer fibers wound around the inner layer fiber bundle, when the number of constituent fibers in the cross section of the yarn is the same, the yarn is compared to the ring spun yarn. It is natural that the power is low.

The present invention eliminates such drawbacks and can be produced by maintaining the good spinning tone by the air false twist spinning method, and further, by blending polyester and hemp, which has a unique feeling of hemp fiber and is blended with hemp. The purpose is to provide a fine thread.

[Means for Solving the Problems] That is, the present invention provides a blended fiber bundle composed of polyester fibers, rayon fibers, and hemp fibers containing hemp in a proportion of 5 to 50% by weight based on the total amount in an opened state. The yarn obtained by directly supplying the air from the front roller of the draft device to the air false twisting spinning device including the pneumatic yarn turning device and the false twist imparting device whose rotation directions are opposite to each other, wherein the hemp fiber is the longest. The fiber length is 150 mm to 240 mm, the average fiber length by the Barbet method of the top analyzer prescribed in JIS L 1083-1971 is 55 mm or more, and the polyester fiber has a longest fiber length of 100 mm.
~ 200 mm, the average fiber length by the Barbe method is 55 mm or more, and the fineness of the single fiber is 5 denier or less, while the maximum fiber length of the rayon fiber is 200 mm or less, the average fiber length by the Barbe method is 55 mm or more In addition, the blended yarn is characterized by containing 10% by weight or more of each of polyester fiber and rayon fiber.

In the present invention, in order to obtain the target blended yarn, a polyester fiber having a specific fiber length and / or fineness, rayon fiber and hemp fiber are combined in a predetermined ratio, and an air false twist spinning device is used as described later. In this case, a high-quality yarn can be effectively spun out without damaging each fiber having a long fiber length by using a hollowing roller as a drafting means.

In the present invention, the amount of hemp fiber is 5% with respect to the total fiber amount.
When the amount is less than the range, the feeling of sufficiency is insufficient, and it is not suitable as the intended clothing material for spring and summer. On the contrary, if it exceeds 50%,
Due to the increase in the hemp fiber mass and the thick hemp fiber, the number of fibers constituting the yarn is reduced, and a good spinning condition cannot be maintained.

The polyester fiber used in the present invention may be a so-called standard type regular polyester fiber or an anti-pill polyester fiber, and may have a circular cross section or a modified cross section. When mixed in the cross section, it may be a fiber, and each fiber is selected according to the intended use and purpose.

This polyester staple is obtained by cutting a tow consisting of a bundle of continuous long fibers with a drafting device such as a tow reactor to form a sliver shape. A method of slicing staples that have been cut to a fixed length in advance through a carding process can also be used, but the former method is preferable in terms of fiber parallelism and efficiency. The fiber length distribution is such that the longest fiber length is 100 mm to 2
It exists in the range of 00 mm, and the average fiber length by the Barbe method is
It should be 55 mm or more, and when a material that meets this condition is mixed with hemp fibers described below, it is possible to maintain a good spinning condition.

In particular, the fineness thereof needs to be as thin as 5 denier or less, and if the fiber is thicker than this, the number of constituent fibers of the spun yarn is too small and the yarn strength becomes insufficient.

As the rayon staple, it is desirable that a tow consisting of a bundle of continuous long fibers is previously cut into a uniform length or a bias shape by a cutter, and then laid into a card to make a sliver. As for the fiber length, the longest fiber length is 200 mm or less, and the average fiber length by Barbe method is 55 mm or more. And the fineness thereof needs to be as thin as 5 denier or less. The reason is the same as in the case of the polyester fiber described above.

As hemp, ramie hemp is most preferable, and it has a fiber length distribution similar to that of the polyester fiber and rayon fiber to be mixed-spun, and is formed into a continuous sliver by a known method and provided to the spinning step. This is put together with the sliver of polyester and rayon in parallel with the pre-spinning step, mixed and spun, formed into roving and supplied to the air false twist spinning device.

The single yarn obtained from the air false twisting spinning device is twisted by aligning and twisting a plurality of, for example, two yarns by a known method to form a twin yarn, which is used as a warp yarn or a weft yarn for a woven fabric, or a yarn for a knit. .

The yarn produced in this way has a silky feel due to the blended hemp fibers and a slick feel due to the rough surface condition peculiar to the yarn obtained by air false twist spinning, and at the same time polyester It has both the elasticity of the fiber and the excellent hygroscopicity of rayon fiber, and the clothes made from it are suitable for spring and summer with a refreshing feeling. As a result, it is possible to enter into this field as a new material, and it will greatly contribute to the expansion of the sales channels of the yarn obtained by the air false twist spinning.

The production of the yarn according to the present invention will be described based on a preferred example shown in the drawings.

As shown in FIG. 2, a roving yarn 2 made of a hemp / rayon / polyester mixed fiber bundle having the above-mentioned structure drawn out from a can 1, a back roller pair 3, a middle roller pair 5 equipped with an apron 4, a front portion. A fleece-shaped product was formed by sequentially passing through a draft mechanism consisting of three pairs of rollers 6, and then passed through the first air swirling nozzle 7, the untwisting tube 8, the second air swirling nozzle 9, and the pull-out roller 10 to obtain the above-mentioned uniqueness. The single yarn Y having the structure of is formed and wound as a package 11.

In order to obtain the yarn of the present invention, a hollowing roller 13 having a structure shown in FIG. 4 is specially adopted for the top roller of the middle roller pair 5 of the draft mechanism 12 shown in FIG. The length of the polyester fiber, the hemp fiber, and the rayon fiber are drafted smoothly. In this hollowing roller 13, the central area of the outer peripheral cotton is manufactured to have a small diameter, and thereby a hollowing portion 14 having an appropriate depth is formed. The depth of the hollow portion 14 is selected according to the count of the supplied roving yarn, and it is desirable to make it deeper for the thick roving yarn, for example, when the weight of the roving yarn is 0.4 to 2.0 g / m. Is 0.4
About 0.8 mm is suitable. The function of the punching roller 13 is that when there is a fiber longer than the roller gauge set in the draft mechanism in the roving (this is the case in the case of the fiber in the sliver prepared by the drafting device). However, it is necessary to control so as not to disturb the draft of other fiber groups without cutting it during drafting.

The characteristics of the yarn of the present invention detailed above will be further clarified by the following examples.

Example 1 20% by weight of sliver of ramie fiber produced by a conventional method
And a sliver with an average fiber length of 70 mm obtained by mounting a tow of polyester fibers consisting of a bundle of many filaments with a fineness of 1.4 denier on a tow reactor
% Of sliver and 45% by weight of sliver obtained by mounting a single fiber of rayon fiber with a fineness of 2 denier into staples with a fiber length of 70 mm by equal length cutting. In the process, it was mixed and spun into 0.9m count roving.

This was set on an air false twist spinning device shown in FIG. 2 to produce a single yarn of 54 meters count. The roller gauge of the draft mechanism was set to 103 mm between the front and the middle and 107 mm between the middle and the back, and the total draft was 60 times. Further, the depth of the hollow portion of the hollow roller was 0.6 mm.

On the other hand, using the same raw material, a single yarn of 54 meters count was obtained by the ring spinning method. About two yarns each of these two single yarns are twisted together to make a twin yarn,
The results of comparison of the physical properties are shown in Table 1.

Table 1 Items Inventive yarn Control product Break strength (g) 585 750 Break elongation (%) 8.1 8.0 Worcester U% 10.0 8.0 Thin (−50%) 25 30 Thick (+ 50%) 33 35 Neps (+ 200%) 64 According to this, the yarn of the present invention is slightly inferior in physical properties to the control product, but there is no problem in practical use.

Next, a woven fabric was prepared using these yarns, and the feel of the fabric was evaluated by the KES method. The results are shown in Table 2. The yarn of the present invention is not inferior to the conventional ring spun yarn in texture. It can be seen that it has characteristics.

Table 2 Items Control invention of the present invention Crunchiness 4.3 3.9 Waist 4.2 3.7 Example 2 Sliver of ramie fiber produced by a conventional method 15% by weight
45% by weight of sliver obtained by bias-cutting single fiber polyester fibers with a fineness of 2.5 denier into staples with a fiber length of 76 mm, and rayon fiber with a fineness of 3 denier monofilament. A sliver 40% by weight obtained by cutting and forming staples with a fiber length of 76 mm on a card was mixed and spun into a 0.7-meter-count roving in the pre-spinning process of worsted spinning.

This was set in the above-mentioned spinning device to produce a 42-meter-count single yarn under the same conditions as in Example 1. This yarn also had the same physical properties as the ring spun yarn as a control.

〔The invention's effect〕

According to the present invention, a polyester / rayon / linen blended yarn having a good sense of crispness is provided by a combination of a unique fiber structure and an air false twisting spinning device, and a garment full of refreshing feeling suitable for spring and summer is manufactured. It becomes possible to contribute to expanding the application of the yarn obtained by the air false twist spinning method.

[Brief description of drawings]

FIG. 1 is a perspective view showing the shape and structure of a single yarn used in the present invention, and FIG. 2 is a side view showing the outline of an air twist spinning device used for producing the yarn shown in FIG. , FIG. 3 is a perspective view showing the main part of the apparatus of FIG. 2, FIG. 4 is a plan view showing the shape of the hollowing roller, 1 ... can, 2 ... roving thread, 3 ... back roller pair, 4 ... Apron, 5 ... Middle roller pair, 6 ... Front roller pair, 7 ... First air swirling nozzle, 8 ... Untwisting tube, 9 ... Second air swirling nozzle, 10 ... Withdrawing roller, 11 …… Package, 12 …… Draft mechanism, 13 …… Centering roller, 14 …… Centering section.

Claims (1)

(57) [Claims] 1. A blended fiber bundle composed of polyester fibers, rayon fibers and hemp fibers containing hemp in an amount of 5 to 50% by weight based on the total amount is rotated from a front roller of a draft device in an open state. A yarn obtained by supplying to an air false twisting spinning device comprising air twisting devices and false twisting devices whose directions are opposite to each other, wherein the hemp fiber has a longest fiber length of 150 mm to 240 mm, JIS L 1083. The average fiber length by the Barbet method of the top analyzer specified in −1971 is 55 mm or more, and the polyester fiber has a longest fiber length of 100 mm to 200 m.
m, the average fiber length by the Barbe method is 55 mm or more, and the fineness of the single fiber is 5 denier or less, while the maximum fiber length of the rayon fiber is 200 mm or less, the average fiber length by the Barbe method is 55 mm or more, Also, a blended yarn characterized by containing 10% by weight or more of each of polyester fiber and rayon fiber.