JPS61608A - Continous method for spinning viscose rayon - Google Patents

Abstract

PURPOSE:To reduce the yarn sway in the initial period of the scouring and shorten the whole roll length, by obtaining finished yarns with a regeneration progress part in the upstream part, scouring treatment part in the middle stream part and drying part in the downstream part of a continuous yarn treating apparatus. CONSTITUTION:Rolls 1 and 2 are divided into three parts in the longitudinal direction, and a yarn 6 containing a coagulation and regeneration solution is wound around a regeneration progress part ( I ) and without operation nor treatment. Scouring water is sprinkled in a scouring treatment part (II), and the yarn is dried in a drying part (III) to give the aimed finished yarn. The roll diameter is gradually decreased in the scouring treatment part (II), and the loosening of the yarn due to the swelling thereof is absorbed. The yarn can be run sufficiently even when the spiral pitch is <=5mm..

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a continuous spinning process for viscose rayon. More specifically, the present invention relates to an improvement in a continuous spinning method using a roll-type continuous yarn processing device that combines a plurality of rolls whose axes are inclined to each other.

2. Description of the Related Art The principle of winding yarn in a spiral around a plurality of rolls whose axes are inclined and moving the yarn forward has been known for a long time.

In particular, in wet spinning methods that require scouring and drying, many attempts have been made to obtain a continuous completed yarn by using a roll as a processing section and arranging a spinning section and a winding section before and after the roll. ing. Example u Rayon Te
xtile MonthlyDEC, 1947, 56#
61, and also disclosed in Japanese Patent Publication No. 53-46927.

However, in the conventional method, yarn sway tends to occur in the area where the regeneration treatment or scouring treatment is performed, and the interval between adjacent yarns wound in a spiral pattern (hereinafter referred to as the spiral pitch) cannot be narrowed. The situation was such that the processing roll had to be made longer or a number of pairs of rolls had to be provided in multiple stages. As the yarn moves forward while being tightly held by multiple rolls, it travels with a large amount of coagulation regenerating liquid or scouring liquid. Once attached, it will no longer separate naturally, and the yarn will no longer be able to advance at the yarn guide, causing the yarn to break.

When observing the phenomenon of yarn adhesion, it is observed that the yarn traveling in a spiral waveforms like when the string of a bow is plucked, and it is observed that the yarn tends to adhere when the spiral pitch is narrow.

In order to prevent the yarn from adhering, it is possible to insert a guide for each spiral or to widen the spiral pitch. However, when the number of spirals increases, the method of inserting a guide becomes difficult to operate and is not industrially practical. Furthermore, the method of widening the spiral pitch requires the roll length to be lengthened, which has the drawback of increasing the operating width and increasing the amount of power energy. These problems become a major obstacle when increasing the spinning speed to a certain degree.

Problems to be Solved by the Invention The inventors of the present invention carefully observed the phenomenon of yarn shaking, and found that the shaking of the scouring processing section was extremely large. Special #rcM training processing department! It was found that the shaking in the area immediately after the start of the process was large, and the shaking in this area propagated to other parts, making the entire thread run unstable. Immediately after starting this scouring, the yarn running is unstable because the yarn swells and stretches easily when it comes into contact with the scouring liquid, and is pulled by the surface tension of the scouring liquid film on the rotating roll surface, causing it to move in the direction of roll rotation. This is because the yarn stretches and vibrates at the position where it leaves the roll.

The present inventors have conducted intensive research on a method for reducing the yarn shaking at the initial stage of the scouring process. As a result, (1)! /(To fully complete the structure of the yarn and bring it to a state of low swelling before entering the line processing section, (2) to ensure appropriate running tension of the yarn when it reaches the scouring section. (3) When the yarn swells in the scouring section! It became.

An object of the present invention is to stabilize yarn running, narrow the spiral pitch, and shorten the overall roll length in a continuous spinning method for viscose rayon using a roll-type continuous yarn processing device.

Another object of the present invention is to provide a rational method that can withstand high-speed spinning.

Means for Solving the Problems The gist of the present invention for achieving the above object of the present invention is to use a roll-type continuous yarn processing device that combines a plurality of rolls whose axes are inclined to each other to process yarn. In a continuous spinning method for viscose rayon, in which a completed thread is obtained by winding it spirally and moving it forward, and continuously scouring and drying the thread, a regeneration progressing section that causes the thread to run substantially in the upstream part of the roll. The continuous spinning method is characterized in that a scouring section in which the diameter of the roll gradually increases is provided in the midstream portion of the roll to perform scouring, and then the yarn is led to a drying section to obtain a finished yarn.

In the viscose rayon spinning method, viscose is spun through a spinneret into a coagulation and regeneration bath, and this coagulation and regeneration bath uses a mixed acidic solution of sulfuric acid, sodium sulfate, and zinc sulfate, called a Mij, 11er bath. . Then, the spun fine wire undergoes a coagulation and regeneration action and is formed into a thread.

The yarn discharged from the coagulation and regeneration bath is introduced to a pair of rotating rolls containing the acidic solution. The present inventors have discovered that at this point, the structure of the yarn is sufficiently completed by the acidic solution contained in the yarn, resulting in a state with a low degree of swelling.

It is known that this coagulation and regeneration process is controlled by the diffusion rate of the coagulation and regeneration liquid toward the yarn center, but the time required to bring the yarn to a state of low swelling is at least It turns out that it takes 15 seconds. Preferably it is 20 seconds or more. That is, in the method of the present invention, this is achieved by providing a regeneration progressing section in the upstream portion of the roll that causes the yarn to run substantially idle. The longer the free running time, the more fully the coagulation and regeneration will progress, but in an atmosphere at room temperature, the process will almost complete in about 60 to 80 seconds after contact with the coagulation and regeneration liquid. Therefore, there is no need to take any more idle time.

By sufficiently perfecting the structure of the yarn, the running tension of the yarn is ensured at an appropriate level when the yarn reaches the scouring processing section. Appropriate tension is one that does not cause the yarn to slack, and if there is some slack, the slack can be eliminated by gradually increasing the diameter of the roll in the regeneration progressing section. The gradual increase rate of the roll diameter is in the range of 0 to 3 inches with respect to the diameter of the inlet of the regeneration progressing section, and if it exceeds 3 inches, the physical properties of the yarn, especially the elongation, will deteriorate. A particularly preferred range is 0 to 2 inches.

When the yarn is introduced into the scouring section, it comes into contact with the scouring solution and begins to swell at the same time, but since the roll diameter gradually increases, the yarn tends to loosen near the entrance of the scouring section. Become. In order to prevent this, it is better to gradually increase the four-hole diameter slightly before the entrance to the scouring section. If the running tension of the yarn is slightly increased by setting the thread, the fluctuation of the yarn can be made smaller and the spiral pitch can be reduced. When the vibration propagating from the scouring section is reduced, the vibration of the yarn in the regeneration progressing section is also reduced.

When the roll diameter is gradually increased, the circumferential speed increases by the amount of increase in the roll diameter each time the thread rotates in a spiral pattern, so the thread is stretched by that amount, and as a result, the running tension gradually increases and the shaking decreases. do.

The rate of gradual increase in the roll diameter allowed in the scouring section is 1-10% of the roll diameter at the entrance of the scouring section even when there is no gradual increase in the regeneration proceeding section. This is because stretching the yarn more than 10 inches causes a decrease in elongation, and the sum of both the regeneration progressing section and the scouring section is preferably within 10% of the gradual increase. Therefore, if the 2T roll diameter is gradually increased in the regeneration progressing section, it is desirable to set it to 8T roll or less in the scouring section.

As mentioned above, in order to eliminate yarn shaking, (1) complete the yarn before entering the scouring section, (2) ensure appropriate yarn running tension, and (3) gradually increase the roll diameter. It is important to set the processing conditions so as to satisfy the following three points: absorbing the swelling of the yarn. Therefore, we set a production holding time of 15 seconds or more in the regeneration progressing section 9 and slightly increased the roll diameter, and while satisfying (1) and (2) above, we further gradually increased the roll diameter in the &line processing section. Go above (3)
A method that satisfies the following is desirable. These three points each have a mutually complementary effect. Example 1i
A configuration in which production is maintained for 15 seconds or more in the regenerating part and the roll diameter is gradually increased by 2 to 3 inches only in the regenerating progressing part is also acceptable.

However, a force in which production is held for 15 seconds or more in the regeneration proceeding section, the roll diameter is not gradually increased, and the roll diameter is gradually increased by 2 to io<-> in the scouring section provides a greater effect. After testing various combinations, we found that the most preferable one is to gradually increase the roll diameter by 0 to 2% in the regeneration progressing section and to apply some tension to the yarn, on the condition that production is maintained for 15 seconds or more in the regeneration progressing section. It is guided to the scouring processing section while being heated, and the scouring processing section 2~
The method was to gradually increase the roll diameter by 5 inches. In addition, the rate of gradual increase in roll diameter must be made different between the regeneration progressing section and the scouring section in order to achieve the effects of the present invention. In particular, remarkable effects can be obtained by setting the gradual increase rate of the roll diameter in the front section of the scouring section to be the largest.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a schematic diagram of a roll type continuous yarn processing device.

The upper roll 1 and the lower roll 2 form a pair, and the axes of the two rolls are not parallel but inclined. The cis-spiral pitch changes depending on the degree of inclination of this axis.

The rolls 1 and 2 are divided into three parts in the longitudinal direction, and in the present invention, the first part 1 is supplied from the regeneration progressing part 0 viscose supply pipe 3, and is supplied from the spinneret 4 to Mυ・1
The yarn 6, which is spun into a coagulation and regeneration bath 5 called a ler bath and formed into a fine wire, passes through yarn guides 7 and 8 and is wound around rotating rolls 1 and 2. At this time, the yarn 6 is wound around the roll while containing the coagulation regenerating liquid (the above-mentioned mixed acidic solution). Then, the yarn to be subjected to some processing is allowed to run idle on the roll.

Subsequently, the yarn 6 is guided to the scouring section (2). Scouring water is sprayed in this area in the form of a shower. 9 is a shower nozzle, and 10 is a scouring water supply pipe. Continue thread 6
is led to the drying section (3) and dried to obtain a finished yarn.

FIG. 2 is a side view of a typical roll used in the method of the present invention. FIG. 2(a) shows a roll in which there is no change in the roll diameter in the regeneration proceeding section I, and the roll diameter is gradually increased with a uniform gradient throughout the subsequent scouring processing section. This roll has the basic shape of the roll used in the method of the present invention. FIG. 2(b) shows a roll in which there is no change in the regeneration progressing section (2), and only the roll diameter of the first half of the scouring section (2) is gradually increased. FIG. 2(e) also shows 3 for the reproduction progress section I.
This roll has a roll diameter gradual increase rate of less than or equal to 1, and the roll diameter also gradually increases in the scouring processing section (2). Figure 2 (
d) is a roll having a roll diameter gradual increase rate of 3% or less in the regeneration progressing section I, and a roll diameter gradually increasing only in the first half of the scouring section π. 2(e) shows a roll in which the roll diameter gradually increases with a uniform gradient throughout the regeneration progressing section (2) and the scouring section (2).

In addition, various changes can be made, but what is important is the roll diameter gradual increase rate in the first half of the scouring section π; the other parts have complementary roles, as shown in Figure 2 (b). And (d) rolls are preferable.

The method of the present invention has been described in detail above, and the present invention has accomplished an economically extremely advantageous and industrially simple spinning technique in a continuous spinning method for viscose rayon. To achieve this, it was first important to stabilize the running of the yarn by shortening the spiral pitch so that it could be processed at high spinning speeds. For this purpose, the spun yarn containing the coagulated regenerating liquid is made to run virtually idle in the regeneration progressing section to fully complete the yarn structure, and then the roll diameter is gradually increased in the scouring section. This was achieved by absorbing the loosening caused by swelling of the yarn.

The present invention has been explained using a spinning device that combines a pair of upper and lower rolls shown in FIG. 1, that is, a Nelson type continuous spinning device.
Example 1 Continuous spinning of viscose rayon was carried out using a roll having a shape according to the conditions of the present invention. . The overall outline of the spinning device used corresponds to Figure 1, and the rolls are as shown in Figure 2 (
The shape shown in &) was used. The diameter of CI-le is
φ=130m 'Iφ=130iu+ Zφ=13
3.9sm, and the roll diameter gradual increase rate o of the regeneration progressing section
'% M Production holding time was set to 25 seconds, and spinning was performed with the roll diameter gradual increase rate of the scouring section set to a%. Adjust the inclination of the axes of the two rolls to set the spiral pitch to 10 ms.
The threads were changed to 7 as-, 5 as-, 4 as-, and 3 as, and the running stability of the yarn was analyzed. The coagulation and regeneration bath for the spun yarn had a normal composition, including Hz 80n, 10% by weight, and Na*.
A mixed acidic solution containing 20% by weight of SOa and 8041% by weight of Zn was used. A spinning speed of 100 @/min and 170 Vmin was tried, but the number of spins was varied so that the holding time in the regeneration progressing section was constant at 25 seconds.

When the spiral comrades of the threads stick together and the thread breaks, a multilayered thread is formed on the four wheels, so count the number of times the thread breaks in that state and convert it to the number of times per 100 spindles and 24 hours. The numbers shown in Table 1 are the numbers shown in Table 1. The evaluation is based on the yield, and is 1
00 weights O, 1 time or less per 24 hours, very good o, o,
1- times is good ○; this level is sufficient for operationalization, 1 to 5 times is slightly unstable △; in this state, there is some concern about operationalization, 5 times or more is poor ×110 times or more were performed in the form of extremely unstable xx.

Margin Table-1 Below, zoom with the same spiral pitch as shown in Table-IK.
4') 170 nv'5+ is slightly more stable.
This is probably because the scouring solution is shaken by centrifugal force in the scouring section.

When the roll of the present invention was used, it was possible to stably run the yarn up to a spiral pitch of just over 4NJR, and the conventional pitch of lO to am could be significantly reduced.

Comparative Example 1 The experiment conducted in Example 1 was conducted using a pair of conventional rolls having a uniform roll diameter.

Table 2 For rolls with a uniform diameter, the limit is about 7 pitches,
If the spiral pitch is less than that, the yarn running stability becomes extremely poor. The pitch is 311ulK.

In this case, a spiral cannot be formed, the yarn sticks somewhere, and the yarn cannot be wound.0 Example 2 The roll diameter gradual increase rate in the regeneration progressing section is 2 inches, and the gradual increase rate in the scouring section is s. % using a roll as shown in Figure 2(d),
The dimension of viscose rayon spinning is Xφ=15
A roll with 0+u, yφ=153ms, and 2φ=157.6m was used. Yarn production retention time in the regeneration progress section is 1
The running stability of the yarn was evaluated by changing the time to 0 seconds, 15 seconds, 20 seconds, and 40 seconds, and changing the spiral pitch. Two conditions were selected for the snow yarn pitch: 8U and 4UI, and the zero spinning speed, which was evaluated by the number of times adjacent yarns adhered to each other on the roll and connected to the cut yarn, was 15 as in Example 1.
Note that the coagulation and regeneration bath for the spun yarn was the same as in Example 1.
0 The results are shown in Table 3.O Below Margin Cloth 3 As can be seen from Table 3, in the case of 8 Seki Pitch, even if the yarn production and retention time in the regeneration progressing section is less than 15 seconds. Although there is some anxiety, it does provide some stability.

However, when it comes to 4m1 JI pitch, the production holding time is 15
It is required that the time be more than 1 second. Preferably it is 20 seconds or more.

Comparative Example 2 The experiment conducted in Example 2 was conducted using a conventional roll of uniform diameter. The results are shown in Table 4FC.

Table 4: When a pair of rolls with a uniform diameter is used, the spiral pitch is set to 8, and the production and retention time of the yarn in the regeneration progressing section is approximately 40 seconds. This is a level that can maintain row running stability. Also 4111
When it becomes 1 pitch, even if the production holding time of the regeneration progressing section is set at 40 seconds or more, the yarn running stability cannot be predicted.

Effects of the Invention According to the spinning method of the present invention, the spiral pitch of the yarn that is spirally wound around a roll and moves forward in the conventional method is l.
5. The thread running was unsteady unless I stopped it.
Even if it is 1111 or less, the yarn can be sufficiently run. Therefore, the processing length of the μ-roll can be halved at once, the equipment cost can be reduced, and the energy for driving the rolls can be significantly reduced. Furthermore, although it was not possible to increase the spinning speed because the processing length of the rolls was insufficient, the method of the present invention has made it possible to obtain yarn at a spinning speed that is more than double the conventional spinning speed.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a roll-type continuous yarn processing device, and FIG. 2 is a side view of a typical roll used in the method of the present invention. ■...Regeneration proceeding section, ■...Scouring processing section, ■...Drying section, 1.2...Pair of no rolls, 3...Viscose supply pipe, 4...Spinning head, 5. ...Coagulation regeneration bath, 6...
Yarn, 7, 8... Thread guide, 9... Shower nozzle, 1o... Scouring water supply pipe Patent applicant Asahi Kasei Corporation Figure U

Claims (7)

[Claims] (1) Using a roll-type continuous yarn processing device that combines multiple rolls whose axes are inclined to each other, the yarn is wound in a spiral and moved forward, and the completed yarn is continuously scoured and dried. In the continuous spinning method for viscose rayon to obtain strips, a regeneration progressing section is provided in the upstream portion of the roll to allow the yarn to run substantially idle, and then a scouring section in which the roll diameter gradually increases is provided in the midstream portion of the roll. A continuous spinning method characterized by scouring in a drying section and then leading to a drying section to obtain a finished yarn. (2) The continuous spinning method according to claim 1, characterized in that the idle running retention time of the yarn in the regeneration progressing section is 15 seconds or more. (3) The continuous spinning method according to claim 1, characterized in that the roll diameter gradual increase rate in the scouring section is 1 to 10% of the roll diameter at the entrance of the scouring section. (4) The regeneration progressing section has a gradual increase rate of roll diameter of 0 to 3% with respect to the diameter of the entrance of the regeneration progressing section, and the yarn is produced and held for 15 seconds or more as claimed in claim 1. Continuous spinning method described (5) 15 in the regeneration progress section where the gradual increase rate of roll diameter is 0 to 2%
The continuous spinning method according to claim 1, characterized in that the yarn is produced and held for more than seconds, and then scouring is performed in a scouring section having a roll diameter gradual increase rate of 2 to 5%. (6) The continuous spinning method according to claim 5, characterized in that the gradual increase rate of the roll diameter in the regeneration progressing section and the scouring section are different. (7) The continuous spinning method according to claim 5, characterized in that the roll diameter gradual increase rate in the first half of the scouring section is the largest.