JPH0321644B2 - - Google Patents

Description

[Detailed description of the invention]

(b) Industrial Application Field The present invention relates to a roll-type wet yarn processing method and apparatus for wet-processing continuously supplied yarn, and in particular, to a method and apparatus for wet-processing continuously supplied yarn. 1
This invention relates to an improvement for eliminating non-uniformity of two yarns when processing with a pair of rolls. (b) Conventional technology Conventionally, in general, roll-type and wet-type yarn processing
As shown in Figure 2 and 42 on page 443 of the Fiber Handbook (published on November 30, 1963, Maruzen), a pair of upper and lower rolls whose axes are tilted to each other is used, and one yarn to be supplied is transferred to the upper and lower rolls. The yarn was wound in a helical shape and run, and after being scoured and dried, the yarn was wound. This process is inefficient, and various improvements have been proposed, but each has its own problems in industrial implementation, and improvements have long been desired. A drum-type continuous spinning method and its device have already been proposed as a method and device for processing a plurality of yarns with a processing roll (for example, Japanese Patent Publication No.
2364 and U.S. Pat. No. 2,883,259). However, with this method and device, it is not possible to make the traveling path length and the contact length with the roll between each yarn the same, and therefore it is not possible to eliminate the non-uniformity between each yarn. . In order to solve the problem of non-uniformity of multiple processed yarns, two yarns are placed on a pair of rolls to make the running path length and the contact length with the rolls between each yarn the same. A method of traveling in a double helical shape separated from each other has been proposed (Japanese Patent Publication No. 53-49119 and US Pat. No. 2,294,871). However, in this method, the two yarns are always run apart from each other, so it is necessary to provide a helical spacing of more than a certain value to prevent adjacent yarns from adhering to each other and becoming entangled. Industrial implementation poses great difficulties because of the large amount of material required. In order to improve the drawbacks of these methods, Japanese Patent Laid-Open No. 59-204907 proposes a twin-roll continuous wet spinning method and apparatus. In this proposal, multiple threads are run on paired rolls, each thread takes the same running path while passing through the upper roll and reaching the lower roll, and each thread is separated by separate rolls while passing through the lower roll and reaching the upper roll. The threads were separated and took different running paths.
This attempt was an effective means of eliminating the physical property differences between each yarn and increasing the processing speed, but the high rotation speed of the separation roll meant that the work was highly dangerous, and the separation roll However, the disadvantage was that the equipment costs were high. This drawback increases as the yarn running speed increases, and is disadvantageous for industrial implementation. (c) Problems to be Solved by the Invention The purpose of the present invention is to solve the above-mentioned drawbacks of the conventional twin-roll wet yarn processing method and apparatus, namely, the non-uniformity of the physical properties of the obtained yarn. We have improved the industrial disadvantages such as the need for long rolls,
The object of the present invention is to provide a method and apparatus that can uniformize the physical properties of yarn, improve the efficiency of equipment, and furthermore be safe and stable for industrial operation. (d) Means for solving the problems In the wet yarn processing method of the present invention, two yarns are wound in the same helical shape on a pair of rolls and run, and the yarns are passed from the upper roll to the lower roll or the lower roll. The two threads traveling from the roll to the upper roll are separated by a bar placed on the running path between the rolls, and each thread is separated and takes a different running path on the side where the bar is installed. The yarn running on the upper and lower rolls and after being separated from the rolls until reaching the first bar is made to run on the same running path. In other words, two yarns contact the same circumferential surface of the first bar that comes into contact with the first bar after the yarn is released from the roll, and then,
After the yarn is released from the roll, the second bar is fixed so as not to rotate, and the second bar is sandwiched between the yarns and the yarn is made to run while being in contact with opposite circumferential surfaces of the bars. In this way, even if the roll entrance positions of the two yarns are the same, each time the yarn goes around the upper and lower rolls, it is repeatedly and constantly separated, the false twist that occurs on the rolls is destroyed, and at the roll exit. The yarn is easily separated into the original two yarns, and a stable yarn running state can be obtained. In addition, the helical spacing between two threads does not need to be increased compared to when only one thread is running.
There is no need to install a long roll, and the increase in equipment costs can be minimized. Further, the two yarns are guided onto the pair of rolls and run around the outer periphery of the upper and lower rolls in the same helical shape, during which the yarns are subjected to reaction, scouring, and drying treatment. At the separation point of the two yarns, each yarn is separated while the two yarns are brought into contact with opposite circumferential surfaces of the bar with a second bar installed on the running path between them. Although different routes are taken, the routes are symmetrical and there is no difference in route length. Therefore, the two threads are subjected to treatments such as reaction, scouring, and drying under extremely uniform conditions, and the differences in physical properties between the resulting threads can be reduced. As in the method of the present invention, two threads are brought into contact with one side circumferential surface of the first bar, and two threads are placed downstream of the first bar.
In the method of separating the main yarn, the yarn is squeezed by the first bar, and the yarn tension is appropriately adjusted between the second bar and the roll on which the yarn runs next. This makes it possible to stabilize the running properties of the yarn. On the other hand, the yarn tension before it touches the first bar is lower, but if you shorten the running path length by adjusting the bar position, the yarn sway will also be reduced, making it easier to use these bars. It is possible to avoid destabilization of yarn running due to this. The role of the first bar is to equalize the separation position of the two yarns as they leave the rotating roll. When separating two yarns from a rotating roll, if the separation positions are different from each other, the single yarn of the yarn that is separated first is likely to be picked up by the yarn that is separated later, and the two yarns are separated. It is easy to cause yarn fineness unevenness, fuzz, and cut threads. This occurs because the liquid film that forms between the yarn that was separated earlier and the yarn that is separated later pulls the yarn that was separated earlier in the direction of the yarn that is separated later. It is something. To prevent this, the two yarns are separated from the roll at the same point, and the two yarns are separated from a fixed or slowly rotating bar. Furthermore, in the method of the present invention, the first bar drains the droplets adhering to the yarn, which improves the running stability of the yarn, and since the scouring chemical solution is sufficiently replaced, the scouring Efficiency can also be improved. Furthermore, the selection of the diameter of the second bar is less restricted by the conditions of the yarn to be supplied, such as the processing speed and the amount of water brought into the yarn, and the diameter of the second bar can be more easily matched to the conditions of the yarn to be processed. Not only can a suitable bar be selected, but also the yarn can be processed under more suitable conditions. The method of the present invention includes viscose rayon, copper ammonia rayon, acrylonitrile polymer yarn,
It can be used to treat wet yarns such as wholly aromatic polyamide yarns. Next, a twin-roll type wet yarn processing apparatus used to carry out the method of the present invention will be explained. As in the present invention, after the yarn leaves the roll,
The device that separates two yarns using the first and second bars that are in contact can separate the two yarns on either side, the side where the lower roll rotates upwards or the side where the upper roll rotates downwards. This can be selected depending on the design of the device or workability. When installing the bar on the side where the lower roll rotates upward, it is preferable to install the bar near the lower roll, and when installing the bar on the side where the upper roll rotates downward, it is preferable to install the bar near the upper roll. Specifically, at the point where the yarn separated by the second bar enters the roll, the two yarns touch each other,
It is preferable that the spiral spacing is the same,
For this purpose, it is desirable to install the second bar at a position where the yarns can be brought into contact with each other due to the surface tension of the coagulating liquid or the scouring chemical adhering to the yarns. That is, it is desirable to install the yarn so that the yarn travel path after passing the second bar to the roll is long. In addition, in order to make the two yarns come into contact with the opposite circumferential surfaces of the bar with the second bar in between, the center of the second bar is aligned with the center of the first bar at the common outer tangent of the upper and lower rolls. If it is on the inside of the first bar, it must be on the common inscribed line between the first bar and the roll in the yarn running direction, or the distance from the inscribed line is within the radius of the second bar. If the center is outside the common external tangent line of the upper and lower rolls, install it on the common external tangent line between the first bar and the roll in the yarn running direction, or at a position where the distance from the external tangent line is within the radius of the second bar. It is necessary to. The need for the two yarns to come into contact with opposite circumferential surfaces of the second bar with the second bar in between is to equalize the running path length and yarn tension of the two yarns, and to The accompanying coagulating liquid, scouring chemical liquid, etc. are squeezed by the bar and form droplets on the bar, but the purpose is to allow these droplets to be carried away by the yarns that are in contact with them without allowing them to grow. If the yarn is brought into contact with only one side of the second bar, a droplet will grow on the bar, and due to the surface tension of this droplet, it will come into contact with the helix of the yarn running next to it, and it will cause the droplets to contact each other. The threads get tangled and break. Furthermore, in order to carry out the present invention more preferably,
If the center of the first bar is inside the common external tangent line of the upper and lower rolls, the center of the second bar is on the common internal tangent line between the first bar and the roll in the yarn running direction. If the center of the bar is outside the common external tangent line of the upper and lower rolls, it is preferable to install the bar on the common external tangent line between the first bar and the rolls in the yarn running direction. As a result, the traveling path length and yarn tension of the two yarns can be made substantially the same, and the coagulating liquid, scouring chemical liquid, etc. that are squeezed by the bar and turned into droplets on the bar can be made substantially the same. The effect of the yarn being carried away is also increased, and the uniformity of the physical properties of the yarn and the running stability of the yarn are further improved. The diameter of each bar is in the range of 2.0 mmφ to 30 mmφ. If a bar with an extremely small diameter of less than 2.0 mmφ is used as the first bar, the tension of the yarn will cause the bar to become arched, and two
It becomes difficult to bring the actual threads into contact with each other, resulting in cut threads due to contact between adjacent threads due to the growth of droplets, and an increase in physical property differences due to an increase in the difference in tension history between the two threads. If a bar with an extremely small diameter of less than 2.0 mmφ is used as the second bar, the separation angle between the two yarns will become smaller, making it easier for a single yarn in one yarn to be taken by the other yarn, causing the two yarns to separate. Inconsistency in fineness and number of single yarns between yarns tends to occur, and the number of feathers and cut yarns also tend to increase. If a bar with a large diameter exceeding 30 mmφ is used as the first bar, the frictional force applied to the yarn will increase, and the yarn tension between the roll and the first bar will decrease, causing the yarn spiral to sway or , winding of the single yarn around the roll becomes more likely, and the yarn tension between the first bar and the next roll increases, and as a result, the elongation decreases. If a bar with a large diameter exceeding 30mmφ is used as the second bar, a large amount of droplets will form at the bottom of the bar, causing uneven separation positions of the two yarn running paths and the helical helix of the yarn running. Make it easier to cause lateral vibrations. In addition, the frictional force applied to the yarn increases, causing the yarn spiral to sway due to a decrease in yarn tension between the first and second bars, and the yarn tension between the second bar and the next roll. As a result, the elongation tends to decrease. More preferably, the diameter of the bar is 3 mmφ to 10 mm.
It is preferable to set it within the range of φ. The reason for this is to reduce the frictional force applied to the yarn, suppressing the horizontal sway of the yarn running helix and the decrease in elongation, and also to prevent the droplets that form at the bottom of the second bar from running on both sides of the bar. By reducing the number of droplets that grow and fall, the number of droplets that grow and fall is reduced, thereby reducing irregularities in the separation positions of two thread running paths and the frequency of lateral oscillation of the thread running helix. It is in. This effect becomes even more pronounced when the yarn running speed is increased. In addition, the diameter of the bar is preferably selected appropriately depending on the tension of the running yarn, the amount of stirring liquid, the yarn running speed, etc. Especially when performing processes such as reaction, scouring, drying, etc. on a roll, For example, when performing scouring on a roll in such a way that a scouring chemical is actively applied, the amount of the liquid being mixed with the yarn is large, and the yarn is swollen by the chemical, the diameter of the second bar should be adjusted. In addition to increasing the separation angle of the threads,
It is preferable to run the yarn with increased tension. 1
There is no problem even if the main bar is stationary, but in order to run the yarn stably over a long period of time, it is desirable to move the bar slowly. When processes such as reaction, scouring, and drying are performed on the counter roll, reaction by-products, low polymerization products, decomposition products of chemical solutions, etc. adhere to or grow on the bar, resulting in a decrease in running stability and quality of the yarn. However, this can be overcome by moving the bar slowly, preferably rotating it slowly and reciprocating it slowly in the axial direction. The speed of rotation and reciprocation of the bar may be very slow; for example, one revolution or one reciprocation every 10 minutes is sufficient. "Yutsukuri" here refers to a rotation speed of 40 rotations/min or less and a reciprocating speed of 10 reciprocations/min or less; at such speeds, there is little concern about work hazards, and the running speed of the thread is low. Yarn running stability does not deteriorate due to movement in the opposite direction or at right angles to the direction. The present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing an example of a twin-roll type wet yarn processing apparatus according to the present invention. This is an example in which, for a pair of upper roll 1 and lower roll 2, two bars 11 and 12 are provided on the inside of the side where the lower roll rotates upward (inside the common tangent line of the upper and lower rolls). . This wet yarn processing device consists of an upper roll 1, a lower roll 2, and bars 11 and 12 whose axes are tilted to each other, and here a scouring chemical supply device 5 and drying devices 7 and 8 are added. Yarns 10 and 10'
The entrance position to the upper roll 1, the thread running path between the upper and lower rolls on the side facing from the upper roll 1 to the lower roll 2, the upper part of the lower roll 2, and the first bar 11 from the lower roll
The thread running path up to the end is made to be the same.
Next, on the running path from the first bar 11 to the upper roll 1, the two threads 10 and 10' sandwich the second bar 12 placed on the running path,
It takes a different running route while contacting the opposite circumferential surface of 2. Yarn 1 separated by second bar 12
0 and 10' adhere to each other at the point where they reach the upper roll 1, and travel on the upper roll 1 while taking the same traveling path. While repeating the above driving mode,
The yarn reaches drying devices 7 and 8 and is wound up after drying. Figure 1 shows an example in which two bars 11 and 12 are installed on the inside of the side where the lower roll 2 rotates upward, but several examples are shown in Figure 2 A, B, C and D. As shown, the installation positions of the bars 11 and 12 are either inside A or outside B on the side where the lower roll 2 rotates upward, or inside C or outside D on the side where the upper roll 1 rotates downward. It's okay. Furthermore, although not shown, it is also possible to install two bars 11 and 12 on both the side where the lower roll 2 rotates upward and the side where the upper roll 1 rotates downward, respectively. be. (e) Effects of the Invention In the method of the present invention, the same rolls can be used to process two yarns as in the case of treating one yarn, and the yarn can be removed from the rotating rolls. Since the points at which the yarns separate can be made the same, the traveling path length and contact length with the roll of the two yarns to be processed can be made the same, allowing the two yarns to react under equal conditions. Processing such as refinement can be performed. As a result, non-uniformity in the physical properties of the two yarns obtained can be extremely reduced. In addition, since the first and second bars are used, it is easy to select a suitable diameter of the bar according to the processing conditions of the yarn on the roll, and it is easy to adjust the tension of the yarn and the amount of liquid brought into the yarn. It becomes possible to maintain suitable conditions such as the above, and the running stability of the yarn can be greatly improved, and the running speed of the yarn can be increased. The device of the present invention can use the same roll as when processing a single yarn, and can also use a bar that rotates little or not at all, so the equipment cost is significantly lower per unit amount of yarn. can be taken as a thing. Further, since the yarn does not wind around the bar, and even when it is rotated, the rotational speed may be extremely low, so that operational safety can be greatly improved. (f) Examples Hereinafter, the present invention will be specifically explained using examples. Example 1 Viscose rayon yarn was treated using the twin-roll wet yarn treatment method and apparatus of the present invention.
The equipment used was of the type shown in Figure 1, and the bar installation position was as shown in Figure 2A. The diameter of the upper and lower rolls was 150 mm, and the diameter of both bars was 6 mm. The bar installation position is 1
Install the main bar at a fixed position of 90 mm from the center of the lower roll and 10 mm inward from the common external tangent line of the upper and lower rolls, and install the second bar on the common internal tangent line of the first bar and the upper roll. It was fixed and attached at a position 20mm from the center of the first bar. The yarn helix spacing was 5 mm, and two yarns of 75 denier/26 filaments were supplied at a running speed of 300 m/min, and the yarns were run on a pair of rolls with the same entry position into the roll. The two threads take the same running route from the upper roll to the lower roll to the first bar, and separate running routes from the first bar to the upper roll. The vehicle was run under the conditions shown in Figure A. While the yarn travels between the upper and lower rolls, a part of the rolls performs scouring and drying on the yarn.
Thereafter, the yarn was wound up using a winder. Table 1 shows the properties of the obtained yarn and the thread cut rate during treatment.

【table】

[Table] As shown in Table 1, the two yarns obtained showed uniform quality and the running condition of the yarns was also good. Example 2 Copper-ammonia type rayon yarn was treated using the twin-roll type, wet type yarn treatment method and apparatus of the present invention. The equipment used was of the type shown in Figure 1.
The mounting position of the bar was as shown in Figure 2 (b). The diameter of the upper and lower rolls was 150 mm, the diameter of the first bar was 5 mm, and the diameter of the second bar was 8 mm. The installation positions of the bars are as follows: the first bar is installed 110mm from the center of the bottom roll, the distance is 15mm outward from the common external tangent line of the top and bottom rolls, and the second bar is installed between the first bar and the top roll. It was attached at a position 30mm from the center of the first bar on the common external tangent line. The first bar installed is rotated at 1 rotation/min in the opposite direction to the lower roll and rotated in the axial direction.
It was moved 5 mm at a speed of 0.2 reciprocation/min. The thread helix spacing was 5 mm, and two threads of 60 denier/46 filament were supplied at a running speed of 400 m/min, and the two threads were run on the opposite roll with the same entry position into the roll. The two yarns take the same running path from the upper roll to the lower roll to the first bar, and separate running paths from the first bar to the upper roll. The vehicle was run under the conditions shown in Figure 2B. While the yarn ran between the upper and lower rolls, a portion of the roll was treated with 10% sulfuric acid, washed with water, and dried, and then wound up with a winder. Table 2 shows the properties of the obtained threads and the thread cutting rate during processing.

[Table] As shown in Table 2, the two yarns obtained showed uniform quality and the running condition of the yarns was also good. Example 3 Viscose rayon yarn was bleached using the twin-roll wet yarn treatment apparatus of the present invention. The equipment used corresponds to the one shown in Figure 1, except that a nozzle that adds moisture to the yarn before it enters the pair of rolls and a device that applies bleaching solution before the scouring process are added. The treatment was carried out using the same equipment as in Example 1. A 0.05% hydrogen peroxide aqueous solution was used as the bleaching solution. Table 3 shows the properties of the obtained threads and the thread cutting rate during processing.

[Table] As shown in Table 3, the two yarns obtained showed uniform quality and the running condition of the yarns was also good. Comparative Example The second bar was installed at a position 5 mm outside the common internal tangent line between the first bar and the upper roll, and the other conditions were the same as in Example 1, and the two yarns were run and processed. Ivy. The running condition of the yarn during processing was particularly poor in the scouring process, with frequent occurrences of shaking of the yarn helix, uneven separation points of the two yarns, etc., and the thread cutting rate was 4.50 times/year.
It took 24 ^hours and was bad. Examples 4 to 21 Viscose rayon yarn was treated using a twin-roll wet yarn treatment device to confirm the effects of the method and device of the present invention. The apparatus used was of the type shown in FIG. In order to confirm the effect of the present invention, in Examples 4 to 11, the diameter of the first bar was changed from that in Example 7.
and 12 to 18, the diameter of the second bar is set as in Example 7.
and Nos. 19 to 21, comparative tests were conducted on examples in which two yarns were processed by changing the mounting position of the bar. The diameter of the upper and lower rolls is 150mmφ, and the mounting position of the bar is as shown in Figure 2.
It is shown in the column of bar attachment position in Table 4. The helical spacing between the threads running on the upper and lower rolls is 5 mm.
300m of 120 denier/40 filament yarn/
The processing was carried out at a running speed of min, and the position on the roll was kept the same. As shown in Figure 2, the running state of the yarn is as follows: After the yarn passes through the first bar, it passes through the second bar, and until it enters the next roll in the yarn running direction, the yarn is separated into separate sections. The vehicle was routed along the same route, and the rest of the vehicle was routed along the same route. While the yarn ran between the upper and lower rolls, the yarn was subjected to a scouring process and a drying process, and then wound up with a winder. Table 4 shows the cutting rate during the treatment. The effect of the present invention is clear from the cut rate results in Table 4, and it can be seen that a plurality of yarns can be efficiently processed by using the method and apparatus of the present invention in roll-type and wet yarn treatment.

【table】

【table】 [Brief explanation of the drawing]

FIG. 1 is a perspective view showing the wet yarn processing apparatus and method of the present invention. FIGS. 2A, 2B, 2C and 2D are side views showing several examples of installation positions of rolls and bars in the wet yarn processing apparatus and method of the present invention. 1... Upper roll of the counter roll, 2... Lower roll of the counter roll, 3... Arrow indicating the rotation direction of the upper roll, 4... Arrow indicating the rotation direction of the lower roll, 5...
...Scouring chemical supply nozzle, 6...Scouring area, 7 and 8
...Drying device, 9...Thread path, 10 and 10'...
Yarn, 11...first bar, 12...second bar, 13...helix spacing of yarn.

Claims (1)

[Claims] 1. A method in which two yarns are continuously wet-processed using a pair of rolls consisting of an upper roll and a lower roll, and the yarn is wound around the pair of rolls in a helical manner while being advanced. The two yarns are made to run on the opposite roll, and after the yarn is released from the roll, the two yarns are brought into contact with the first bar on the same side, and then after the yarn is released from the roll, The second bar that comes into contact with the second bar, which is fixed so as not to rotate, is sandwiched between the two bars and brought into contact with opposite circumferential surfaces of each other, so that each yarn is separated and takes a different running path, and at least the upper and lower A wet yarn processing method characterized in that the yarn running on the circumference of the roll and between reaching the first bar after being separated from the roll runs on the same running path. 2. The wet yarn processing method according to claim 1, in which the diameter of the bar is in the range of 2 mmφ to 30 mmφ. 3. The wet yarn processing method according to claim 1, which uses a bar that slowly rotates and slowly reciprocates in the axial direction. 4. In an apparatus that uses a pair of rolls consisting of an upper roll and a lower roll, and continuously wet-processes the yarn by winding it around the pair of rolls in a helical shape and moving it forward, the yarn first comes into contact with the roll after being separated from the roll. A second bar with a diameter of 2 mmφ to 30 mmφ that is fixed so that it does not rotate, which comes into contact with the second bar after the yarn is separated from the roll, is between the first bar with a diameter of 2 mmφ to 30 mmφ and the roll in the thread running direction. A first bar is installed, and the second bar is installed at a position where the two threads that have passed through one side of the circumferential surface of the first bar are in contact with mutually opposite circumferential surfaces of the second bar. , and said 2
If the center of the first bar is inside the common external tangent line of the upper and lower rolls, the center of the first bar is on the common internal tangent line between the first bar and the roll in the yarn running direction, or the distance from the internal tangent line. is within the radius of the second bar, and if the center of the first bar is outside the common external tangent line of the upper and lower rolls, it is on the common external tangent line between the first bar and the roll in the yarn running direction, or A wet yarn processing device characterized in that the wet yarn processing device is installed at a position within the radius of the second bar at a distance from the external tangent. 5. The wet yarn processing device according to claim 4, wherein the first bar rotates slowly and makes a slow piston movement in the axial direction.