JPH043454B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for wet spinning linen fibers, in which a sliver made of linen fibers (hereinafter referred to as linen sliver) is wetted, drafted, and false-twisted into yarn. There are two methods for spinning linen fiber: wet and dry.The wet method spins linen fibers in a wet state, and its purpose is to separate linen fibers into individual filaments to create finer yarns. The objective is to enable the spinning of flexible yarns. That is, linen fibers are usually 30-40 denier in thickness and 20-70 denier in length.
Linen fibers are coarse and long fibers of about 1.5 cm in diameter, and are made up of single fibers with a thickness of 2 to 3 deniers and a length of usually 25 to 40 mm. They are glued together by adhesive substances such as hemicellulose. Therefore, the linen fibers are treated with an alkaline aqueous solution to remove some of the adhesive substances, and then the linen fibers are moistened to reduce the adhesive force of the remaining adhesive substances and drafted.
By separating the linen fibers into individual single fibers and spinning them in this state, the thin single fibers become the constituent units of the yarn, and the number of constituent fibers per unit cross-sectional area of the yarn increases. Increase, fine count,
Moreover, it becomes possible to spin flexible yarn. As a wet spinning method for linen fibers as described above, the method described in Japanese Patent Application Laid-open No. 46-6465 is known, but this method involves moistening the roving and then creating a one-zone draft. This is the way to do it. That is, in the equipment for producing roving in the previous step, linen fibers are stretched and cut in advance so that the average fiber length is about 100 to 150 mm, and the roving made of linen fibers with this average fiber length is cut. It is a method of spinning. but,
In this method, if the average cut fiber length of the roving and the roller gauge of the draft are not adjusted to an appropriate relationship during drafting, the linen fibers may be completely separated into individual single fibers by the draft. This is difficult, and the drafting process often ends without being separated, making it impossible to spin fine yarn. Furthermore, draft irregularities occur during drafting, leading to frequent thread breakage. As a result of various studies by the present inventors on the causes of the drawbacks of the conventional method, the following conclusions were reached. That is, in the conventional method, the process of separating linen fibers into individual single fibers and the process of drawing the sliver (draft process) are performed simultaneously.
I thought this was the cause of the above drawbacks. Therefore, the present invention consists of a process of separating linen fibers into individual single fibers (referred to as pre-drafting in the present invention), and a process of drawing a sliver made of the separated single fibers into thin pieces (referred to as a pre-draft in the present invention). (referred to as draft).
By carrying out each process separately and in succession, it is possible to spin yarn with a fine count and excellent uniformity and appearance. That is, in the present invention, a sliver made of linen fibers treated with an alkaline aqueous solution is watered and pre-drafted, the single fibers forming the linen fibers are separated and independent, and then immediately watered and drawn out while being false-twisted. A wet spinning method in which linen is drafted and then false-twisted into yarn, with an average linen fiber length of L.
(mm), the maximum single fiber length is S (mm), and the pre-draft roller gauge value is G (mm), S<G<
The present invention relates to a wet spinning method for linen fibers, which is characterized in that pre-drafting is carried out by adjusting the roller gauge so that the linen fibers are L. The configuration of the present invention will be explained in detail below. FIG. 1 is a simplified side view of a wet spinning apparatus for carrying out the present invention. Linen fibers made of single fibers with a maximum single fiber length of Smm and drawn and cut so that the average linen fiber length is Lmm, such as pectin, which is treated with a high-temperature alkaline aqueous solution to bond the fibers together. A linen sliver 1 from which a part of the adhesive substance has been removed is sent through a guide 2 to a water supply device 3 to moisten it to reduce the adhesive force of the remaining adhesive substance, and then to the cross crawlers 5, 5' of the pre-draft 4. and front rollers 6, 6' to separate each single fiber by pre-drafting. At this time, the roller gauge Gmm is adjusted so that S<G<L. After pre-drafting, the water supply false-twisting device 7 further supplies water and draws out the product while it is being false-twisted.
After main drafting with 10', false twisting is performed with false twisting device 11 to form yarn 1', and the yarn is drawn out with rollers 12 and 1.
Pull out at 2'. In the method of the present invention, it is essential to adjust the value of the pre-draft roller gauge G so that S<G<L as described above. If the value of the roller gauge G is G≧L, the roller gauge will be too wide and both ends of the linen fiber, which is formed by bonding multiple single fibers, will not be nipped, and both ends will be pulled. As a result, the linen fibers are not separated into individual filaments, resulting in poor drafting properties during the main draft, resulting in draft irregularities, and the spun yarn has low uniformity. Since the thickness of the fibers that form the constituent units of the yarn is thick, it is difficult to spin fine-count yarn, and the texture becomes stiff. Also, if the value of the roller gauge G is G≦S, the roller gauge is narrower than the maximum single fiber length S of the single fibers forming the linen fibers of the linen sliver, so both ends of the same single fiber are nipped by the front roller and the back roller. Therefore, it becomes difficult to separate each single fiber due to the draft. If the nipping force is insufficient, incorrect drafting will occur and the linen fibers will be wrapped around the front roller, and if the nipping force is sufficient, single fibers will be cut. Furthermore, during the main draft, the drafting properties deteriorate and draft irregularities occur, resulting in the spun yarn having a low degree of symmetry.
Its texture also becomes stiff, making it difficult to spin fine-count yarn. In addition, the average linen fiber length means the average value of the fiber length of linen fibers before being pre-drafted,
It can be set arbitrarily by cutting the linen fiber into a certain length. Generally, the average linen fiber length is preferably about 100 to 150 mm. Furthermore, the maximum single fiber length means the maximum length of several tens of single fibers forming linen fibers, and is generally about 40 mm. The present invention has the above configuration, and the value of the roller gauge G of the pre-draft zone is larger than the maximum single fiber length S of the single fibers forming the linen fiber,
By adjusting the length to be smaller than the average linen fiber length L, proper drafting is performed in the pre-draft zone, and the single fibers forming the linen fibers are sufficiently separated individually, resulting in proper drafting in the main draft zone as well. This makes it possible to spin fine-count yarn with a highly even and flexible texture without causing draft irregularities, roller wrapping, or yarn breakage. That is, the method of the present invention is truly remarkable in that it contributes to improved productivity and quality compared to the conventional method. Examples of the present invention will be listed next, but the technical scope of the present invention is not limited thereby. Example: Average fineness is 40 denier, average linen fiber length L is
After treating a 100 mm linen sliver (150 gel/6 yards) with a 0.5% caustic soda aqueous solution at 95°C for 1 hour, it was wet-drafted using the equipment shown in Figure 1 at a pre-draft magnification of 2.5 times and a main draft magnification of 9 times. Spun yarn with linen count 25. Here, the pre-draft roller gauge G value is 40, 55,
The lengths were changed to 70, 90, and 110 mm, and the spinning pattern, yarn uniformity U%, and appearance were examined for each case.
The results are shown in Table 1. Note that the maximum single fiber length S of the single fibers forming the linen fiber was 40 mm.

[Table] As is clear from the table above, the pre-draft roller gauge G is 40, which is the maximum single fiber length S of linen fiber.
mm, the average linen fiber length L of linen fibers
In the case of the present invention, which is smaller than 100 mm, the spinning pattern, the uniformity of the yarn, and the appearance are extremely good.

[Brief explanation of drawings]

FIG. 1 is a simplified side view of a wet spinning apparatus for carrying out the method of the invention. 1... Linen sliver, 1'... Yarn, 3...
...Water supply device, 4...Pre-draft zone, 7...
Water supply false twisting device, 8... Main draft zone, 1
1...False twisting device.

Claims (1)

[Claims] 1 A sliver made of linen fibers treated with an alkaline aqueous solution is watered and pre-drafted, the single fibers forming the linen fibers are separated and independent, and immediately after watering and false-twisting, the sliver is drawn out for main drafting, and then pre-drafted. In the wet spinning method of twisting into yarn, when the average linen fiber length is L (mm), the maximum single fiber length is S (mm), and the pre-draft roller gauge value is G (mm), A wet spinning method for linen fibers, which comprises pre-drafting by adjusting a roller gauge so that S<G<L.