JPH0331805B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a twin-roll type continuous yarn processing method and apparatus. More specifically, it describes a method and device for continuous yarn processing using a pair of rolls, which improves equipment productivity, space productivity, and uniformity of yarn physical properties. The yarn is run on a roll, and during this time each yarn is subjected to uniform reaction, scouring, washing, and other post-treatments (hereinafter collectively referred to as "refining treatment"), drying treatment, etc., and then the next step such as winding process. The present invention relates to improvements in a paired-roll continuous yarn processing method and device configured to feed yarn into a process. [Prior Art] Various methods and devices for simultaneously processing a plurality of yarns using a pair of rolls have been proposed. For example, in the drum-type continuous yarn processing technology proposed in Japanese Patent Publication No. 31-2364 and U.S. Patent No. 2883259, a processing drum (or roll) and a plurality of feed rolls are used. It is possible to process one yarn, that is, the number of yarns equivalent to the number of feed rolls, but because the multiple feed rolls are each provided at a different distance from the processing drum (or roll). , the spiral length per turn of each thread varies widely,
The various scouring and drying processing times vary widely. As a result, differences in physical properties such as variations in the degree of scouring occurred between each yarn, and when the yarn was used as a product, dyeing spots and streaks occurred, making it extremely difficult to withstand industrial implementation. . In order to solve this drawback, several techniques have been proposed in which a single feed roll is provided and a component for separating a plurality of yarns is provided between the feed roll and a pair of processing drums (or rolls). For example, US Pat. No. 2,294,871 discloses a technique in which a plurality of separation bars are installed inside the circumscribed tangent of a pair of rolls and a plurality of yarns are run. However, since this is a technology in which each thread runs separately on the roll, the length of the roll must be increased by a multiple of the number of threads run, making thread stand and thread trimming operations difficult. In order to rotate long rolls at high speed, it is necessary to design the rolls, shafts, and spinning machines themselves to be extremely strong in order to suppress roll runout, and to improve the manufacturing precision of the rolls, which requires high equipment costs and industrial It was not advantageous. If the roll length was kept short, the spinning speed had to be lowered as a compensation. Furthermore, due to the difference in the spiral length of each yarn and the difference in the tension applied to each yarn, unevenness occurred in mechanical properties such as strength and elongation, and the yarn and product were not satisfactory. JP-A No. 53-49119 states that in wet yarn processing using a pair of rolls as described above, by bringing two yarns into contact with a bar, the difference in spiral length between both yarns is eliminated. Although the problem was solved,
Similar to the above, this technique also cannot guide both yarns along the same traveling path, requires a roll length twice the normal length, and does not contribute to reducing equipment costs or increasing spinning speed. Furthermore, in this technique, when the bar was rotated, one of the yarns received a rotational force from the bar in the opposite direction to the running direction, resulting in a lot of fuzz and cut threads. Furthermore, although Japanese Patent Application Laid-open No. 59-204907 succeeded in solving the problem of guiding multiple threads on the same running path and maintaining the roll length, it was still not possible to maintain a constant tension on each thread, resulting in high Low tension was drawn into the tension yarn, causing yarn breakage, and variations in physical properties could not be avoided. Furthermore, since the separation roll rotates at high speed, if a cut thread is generated and easily wraps around the separation roll, removing it may be dangerous, and the rotation speed of the separation roll must be adjusted to match the rotation speed of the upper and lower rolls. Therefore, the drive gear section had to be installed within the work space, and the workability was also unsatisfactory. In this way, with any of the conventional techniques, it has not been possible to achieve a method that satisfies equipment productivity, uniformity of physical properties of multiple threads, space productivity, and workability at the same time, and can be implemented with industrial advantage. The current situation is that this is not the case. [Problems to be Solved by the Invention] The purpose of the present invention is to solve the above-mentioned drawbacks of the conventional roll-type continuous yarn processing technology, namely, low equipment productivity, low space productivity, and poor physical properties of yarn. It is an object of the present invention to provide an improved method and apparatus for treating a continuous yarn with rolls, which solves the problems of uniformity and workability, and which can be fully implemented industrially. [Means for solving the problems] The twin-roll continuous yarn processing method according to the present invention has the following features:
Using a pair of rolls consisting of an upper roll and a lower roll,
In the method of continuously processing the yarn while winding the yarn around the pair of rolls in a helical shape and advancing the yarn,
At least one separation bar fixed so as not to rotate is placed on the yarn running surface that connects the upper and lower rolls, and at least two multiple yarns are placed in contact with each other on the same running path and are separated from the rolls. Each of the plurality of yarns is introduced above, and each of the plurality of yarns is in contact with the separation bar, and one yarn constituting the plurality of yarns is placed opposite to the separation bar with at least one separation bar sandwiched between the remaining yarns. When traveling on a running path that separates and takes different running paths while contacting the circumferential surface, and connects the upper and lower rolls on the circumference of the upper and lower rolls and the upper and lower rolls on the side that are not separated by the separation bar, multiple separated The present invention is characterized in that the yarns are made to run in a state where they merge on the same traveling path and are in contact with each other, and each yarn is made to travel on a traveling path different from that of the other yarns. Further, the twin-roll type continuous yarn processing device of the present invention is a continuous yarn processing device equipped with a twin roll consisting of an upper roll and a bottom roll, in which at least two plurality of yarns are arranged on the same running path on the twin roll. A plurality of yarn guides are arranged so as to introduce the yarn, and each of the plurality of yarns is in contact with the yarn traveling surface connecting the upper and lower rolls, and one yarn constituting the plurality of yarns is attached to the remaining yarns. At least one circumscribed circle diameter d fixed so as not to rotate so as to abut against mutually opposite peripheral surfaces
(mm) and yarn running speed V (m/min) are arranged in a relationship such that 2≦d≦4800/V. The method of the present invention will be specifically explained below. In the method of the present invention, a plurality of yarns are introduced onto a pair of rolls in contact with each other on the same running path. "Contact" as used in the method of the present invention refers to a state in which at least some of the single yarns of different yarns constituting a plurality of yarns run in contact with each other. The plurality of threads run while being sandwiched by a separation bar placed on the running road surface connecting the upper and lower rolls. Here, to simplify the explanation, a case will first be described in which one separation bar is disposed on one side of the lower roll rotating upward. In this case, the plural yarns are two yarns, and one yarn, after leaving the lower roll of the counter roll, runs toward the outer peripheral surface of the separation bar and comes into contact with the peripheral surface. rear,
Run towards the upper roll. After leaving the lower roll, the other thread runs toward the inner circumferential surface of the separating bar, contacts the circumferential surface, and then runs toward the upper roll. The two yarns separated by the separation bar with their opposite peripheral surfaces in contact with each other in this way join together on the same running path again when entering the upper roll, and run in contact with each other. In this case, since there is no separation bar on the running path from the upper roll to the lower roll, the two yarns run in contact with each other on the same running path from the upper roll to the lower roll and are introduced into the lower roll. . Thereafter, while repeating the same separation and merging process, it travels in a helical manner according to a certain helical pitch, and is subjected to necessary treatments such as scouring and drying. The yarn that runs in contact with the outer circumferential surface of the separating bar always runs in contact with the outer circumferential surface of the separating bar as long as the separating bar continues to exist, and the yarn that runs in contact with the inner circumferential surface of the separating bar always runs in contact with the outer circumferential surface of the separating bar. always travel in contact with the inner circumferential surface, and therefore their travel paths are all different and do not intersect on the way. If one more separation bar is located on the opposite running path, that is, one on each side of the running path connecting the upper and lower rolls, four or three yarns may be run. Can be done. When going from the lower roll to the upper roll, the yarn is separated into two by a separation bar, and each two yarns are further separated into two by the separation bar when going from the upper roll to the lower roll. . The running paths of the four yarns are all different, and for each two separation bars,
Always inside - yarn running on the inside, outside - yarn running on the inside, inside - yarn running on the outside, outside -
It is divided into threads running on the outside and made to run. Even if a plurality of yarns run on the same running path, there is no problem in terms of running and processing, but it becomes difficult to separate them when entering the winding process, and it has little practical meaning. Even if two separation bars are installed on the same side connecting the upper and lower rolls, it is possible to separate three and four yarns using the method of the present invention. The method of the present invention has two major improvements over conventional methods. The first improvement is that by making multiple yarns contact each other on the pair of rolls and take the same running path, the length of the roll is the same as the conventional one required to run one yarn on a pair of rolls. All yarns can be processed with a long roll. Therefore, it is possible to increase the production amount without significantly increasing the equipment cost, and it is possible to provide equipment with extremely improved equipment productivity. Further, since the roll length does not change, workability is also good. The second improvement is that since multiple yarns are run in contact with the opposite circumferential surface of the separation bar, the running path length of all yarns can be made the same, and the necessary processing time can be achieved in the same processing time. can be applied. Furthermore, since the threads run symmetrically with respect to the separation bar, the tension exerted by the separation bar is also the same. Therefore, the physical properties of the yarn are approximately the same between the yarns, and the unevenness of the product can be kept to an extremely small level. The greatest advantage of the method of the present invention is that the above two points can be satisfied at the same time. The method of the present invention can be used to treat continuous yarns such as viscose rayon, copper ammonia rayon, acrylonitrile polymer yarn, and wholly aromatic polyamide yarn. In the method of the invention, a separating bar is used which is fixed so as not to rotate. When the separation bar is rotated, the thread running in the opposite direction to the rotation direction is subjected to extra tension, which tends to increase fuzz and cut threads, and also causes the thread to wrap around the separation bar. Disadvantages are likely to occur, such as a reduction in the safety of the work when removing this and additional expenses such as equipment costs for the drive gear section. Circumscribed circle diameter d (mm) and thread running speed V (m/min)
Significant advantages arise from using separation bars with the relationship 2d4800/V. In other words, defects tend to increase if the separation bar is too thick or too thin, and it is better to use a thinner separation bar when running at high speeds than when running at low speeds, improving the running stability and quality of the yarn. This means that the results will be further improved. If the separation bar is made too thick than 4800/V, the contact area between the yarn and the separation bar will increase too much, which will cause excessive tension on the yarn, which will easily damage the yarn and lead to an increase in fuzz. The liquid tends to be drained too much and the processing time is likely to be insufficient. Furthermore, when the separation bar is made thinner than 2 mm, the separation angle between the plurality of yarns separated by the separation bar becomes smaller, and the liquid adhering to the yarns forms a liquid film between the yarns to be separated. The surface tension of this liquid film pulls the threads together, making them more likely to break. As the speed increases, the tension when the yarn comes into contact with the separation bar increases, so shifting the upper value of the diameter d of the separation bar to a smaller value makes it more stable. In the method of the present invention, any method may be used to discharge the spinning dope from the spinneret.
Alternatively, the present invention may be applied to a case where a yarn that has been once scoured and dried is subjected to a new treatment. There are no limitations on the winding method, and any method may be used. The spinning denier and the number of single yarns are also not particularly limited. Particularly when processing thick denier yarns, an appropriate material should be selected from the standpoint of strength for the separation bar. Furthermore, the method of the present invention is designed to control the thread running speed, and there will be no problem if the diameter of the separation bar is selected according to the speed. In the spinning of viscose rayon, the present inventors used a separation bar of d = 6 mm for 700 m/
It runs stably at a processing speed of 10 minutes and produces high-quality yarn. Next, the apparatus of the present invention used to carry out the method of the present invention will be explained. In the apparatus of the present invention, a plurality of yarn guides are arranged so as to introduce a plurality of yarns into the same travel path on the pair of rolls. In a twin-roll type continuous yarn device, the helical pitch is determined by the inclination of the axes of the upper and lower rolls, and yarns introduced at the same position run on the same traveling path and can be pulled out from the same position. The roll length for processing the threads may be the same length as the roll length for processing individual threads. The separation bar is configured such that each of the plurality of threads contacts the thread running surface connecting the upper and lower rolls, and at least two threads contact opposite peripheral surfaces.
be placed. With this arrangement, each of the plurality of threads can have the same running path length and the same length of contact with the separation bar, and can take different running paths. The separation bar is fixed so as not to rotate, and the diameter d of the circumscribed circle of the separation bar must satisfy 2d4800/V. The reasons are the same as those described in the explanation of the method of the present invention. It is further preferred that the separating bar is provided only on one side of the lower roll that rotates upward. In this case, gravity acts on the liquid film formed between the two yarns under the separation bar and inhibits the growth of the liquid film, making it possible to reduce the surface tension that draws the two yarns together. , the occurrence of thread breakage is reduced. Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing the continuous yarn processing method and apparatus of the present invention, and is an example in which one separation bar 13 is used to run two yarns. FIG. 2A is a cross-sectional view taken at right angles to the roll axis as seen from the spinning side in FIG. 1, and the separation bar 13 is disposed on one side of the lower roll rotating upward. FIG. 2B is a sectional view when the separation bar 13 is arranged on one side of the upper roll rotating downward. The yarns 12 and 12' are, for example, connected to the stock solution supply pipe 1.
The yarn is spun from spinnerets 9 and 9' through threads 0 and 10', and guided to a yarn introduction position 16 on the pair of rolls by yarn guides 11 and 11'. Two threads 12
and 12' join together on the upper roll 1 and head toward the lower roll 2. Surface 1 on which the lower roll 2 rotates upward
5, the two threads 12 and 12' are separated at position 18 on the lower roll 2, and one is in contact with the inner circumferential surface of the separation bar 13. , while the other side is in contact with the outer circumferential surface, passes through opposite circumferential surfaces, merges at a merging point 19 on the upper roll 1, and runs on the upper roll 1 in contact with or in close proximity to each other, following a constant helical pitch 17. Thereafter, it moves forward in a spiral while repeating the same process. After passing through the scouring section 6, the yarns 12 and 12' run through the drying sections 7 and 8, leave the rolls at the roll exits 20 and 20', and head to the next process such as a winding process. As shown in FIGS. 2A and 2B, one separation bar separates two yarns on either side of the yarn running path connecting the pair of rolls 1 and 2 rotating in the directions of arrows 3 and 4. The yarn is arranged so as to be in contact with the opposite circumferential surface. Figure 3 shows the arrangement of the separation bars and the running path of each yarn when four yarns 12, 12', 12'', 12 are run using two separation bars 13 and 13'. (The yarn on the counter roll is omitted in the figure.) The yarn 12 runs inside the separation bar 13 and inside the separation bar 13', and the yarn 12' runs inside the separation bar 13.
The yarn 1
2'' runs on the inside of the separation bar 13 and the outside of the separation bar 13', and the yarn 12 runs on the outside of the separation bar 13 and the outside of the separation bar 13', and both yarns have the same running path length. Figure 4 shows the separation bar and the running path of each yarn when three yarns 12, 12', 12'' are made to travel with two separation bars 13 and 13'. (The yarn on the counter roll is omitted in the figure). The yarn 12 runs outside the separating bar 13 and outside the separating bar 13'; the yarn 12' runs outside the separating bar 13 and inside the separating bar 13';
3 and inside the separation bar 13', all yarns have the same running path length and take different running paths. FIG. 5 shows that two separating bars 13 and 13' are
Separation bar and each yarn when the yarn is on the running path from the lower roll to the upper roll and three yarns 12, 12', 12'' are made to travel by two separation bars 13 and 13' (The yarn on the counter-roll is omitted in the figure.) The yarn 12 runs on the outside of the separation bar 13 and the outside of the separation bar 13',
The yarn 12' is connected to the inside of the separation bar 13 and the separation bar 1.
The thread 12'' runs on the outside of the separation bar 13 and the separation bar 13', and both threads have the same running path length and take different running paths. [Embodiment] ] Below, it will be explained in more detail with reference to Examples.Example 1 Using the continuous yarn processing method and apparatus of the present invention,
Viscose rayon yarn was thread-treated. The apparatus used corresponds to that shown in FIG. 3, and the upper and lower rolls had a diameter of 150 mm, and two separation bars with a diameter of 25 mm were fixed so as not to rotate. The spiral pitch is 7mm, 250 denier/50
Four filament yarns were processed at a spinning speed of 180 m/min and a yarn running speed. The four yarns run on the rolls on the same running path as shown in Figure 3, coming into contact with two separation bars and repeating separation and merging, during which they are treated with 0.05 g of scouring soda/water solution.
After being washed with water for 1 second, and then washed with water for another 10 seconds and dried, the film was removed from the roll and wound up with a winder. Table 1 shows the physical properties of the obtained yarn, the thread cutting rate during spinning, and the number of fuzz. Yarns 1 to 4 in the table are each 3rd yarn.
This is shown in threads 12 to 12 in the figure.

[Table] Evaluation method: (1) Dryness, dry elongation, etc. Using a Schottspur type serimeter (manufactured by Asano Seisakusho), the average value of n = 5 points was shown. (2) Dyeing difference: After the yarn was tube-knitted and dyed, it was visually measured using the JIS L0804 gray scale color difference as a reference. Note that yarn 1 was used as the reference yarn. Since the color difference of the JIS L0804 gray scale for discoloration and fading is determined by the Adams-Nitzkerson color difference equation (NBS units), the unit of the staining difference is expressed as ΔNBS. (3)…Whiteness is JIS
Measured by L1013. As is clear from Table 1, the physical properties of Yarns 1 to 4 were all the same, and the level of the fluffed threads also showed good values. Examples 2 to 21 150 denier/40 filaments were processed by varying the diameter of the separation bar and yarn running speed as shown in Table 2. Other conditions were exactly the same as in Example 1. In addition to thread cutting rate and number of fuzz, whiteness was evaluated to see if the processing time was sufficient. The value of whiteness was represented by yarn 1 corresponding to yarn 12 in FIG. 2, but the whiteness of yarns 2 to 4 was approximately equivalent to yarn 1. The results are shown in Table 2.

【table】

[Table] *1 Same as Figure 2 (A) As is clear from Table 2, the technique of the present invention can be applied satisfactorily under various conditions. As the diameter of the separation bar became thicker, the whiteness decreased slightly, and the number of cut threads and fuzz also tended to increase, and as the diameter of the separation bar became thinner, the number of cut threads tended to increase. Comparative Example 1 Using a device corresponding to Figure 3, the helical pitch was set to 14 mm, one of the thread guides for the two threads was placed 7 mm deeper than the other, and the two threads merged. A yarn was spun in the same manner as in Example 1, except that the yarn was colored extremely yellow, with clearly insufficient regeneration. Comparative Example 2 Four yarns were processed using a drum continuous spinning device equipped with four feed rolls. The equipment used was manufactured by JP-A-Sho.
It corresponds to the device shown in Figure 1 of Publication No. 53-49119, and the drum diameter is 500 mm, the feed roll diameter is 100 mm, and the suspended length of the thread running from the drum to each feed roll is 26 cm sequentially from the lower feed roll. , 40
cm, 52.5cm, and 65cm. A yarn was obtained in the same manner as in Example 1 except that this device was used. 3rd result
Shown in the table.

[Table] As is clear from Table 3, in this example, yarn 1 to
Since the suspension lengths of No. 4 and No. 4 differed, resulting in differences in residence time in the processing section, it was not possible to eliminate the differences in physical properties. Comparative Examples 3 to 5 Two yarns were treated with one separation roll using the same apparatus as in Example 1 described in JP-A-59-204907. A separation roll rotating with a diameter of 50 mm was used, and a 300 denier/50 filament was spun at 130 m/min with a helical pitch of 7 mm for yarn treatment. The yarn that comes into direct contact with the separation roll is referred to as yarn 1, and the yarn that does not come into direct contact with the separation roll is referred to as yarn 2. The tension at the time of entering the roll was varied to evaluate strength and elongation and thread cut rate. The results are shown in Table 4.

[Table] As is clear from Table 4, if the roll input tension of yarns 1 and 2 is the same, the physical properties can be made almost the same, but yarn 1 is taken by yarn 2 and the cut yarn is cut. Occurs frequently. If the tension of yarn 1 is set higher than that of yarn 2, the number of cut threads can be reduced, but this results in uneven physical properties, making it impossible to satisfy both the physical properties and the thread cut rate. Example 22 The four threads obtained in Example 1 were wound up and subjected to bleaching and drying treatment again using the apparatus used in Example 1. For bleaching, a 0.05% H ₂ O ₂ aqueous solution was used. Table 5 shows the whiteness of the obtained yarn.

[Table] As is clear from Table 5, yarns 1 to 4 all showed the same degree of whiteness, with no difference. [Effects of the Invention] As can be seen from the above examples and comparative examples, according to the present invention, there is almost no difference in physical properties between multiple yarns, and an extremely low and stable thread cut rate and fuzz count can be achieved. Continuous yarn processing can be performed up to the high spinning speed range while maintaining the same. It should be noted that as the separation bar diameter d increases, there is a tendency for fluff to increase;
Since there is a tendency for the thread cut rate to increase as the diameter decreases, the effect of the present invention can be enhanced by selecting an appropriate diameter depending on the thread running speed. On the other hand, if the conditions shown in the comparative example are used, it is not possible to maintain the physical properties at a high level, eliminate the difference between yarns, and stabilize the fuzz and cut yarn. This also shows that the present invention has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the continuous yarn processing method and apparatus of the present invention, and is an example in which two yarns are run using one separation bar. FIGS. 2A and 2B are cross-sectional views taken perpendicular to the roll axis of the present invention. Figure 3 shows 4 parts with two separation bars of the present invention.
FIG. 3 is a sectional view showing a mode in which the yarn of the book is made to travel. FIGS. 4 and 5 are cross-sectional views showing a mode in which three yarns are run using two separation bars 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 liquid supply nozzle, 6... scouring processing section, 7 and 8... drying device,
9 and 9'... Spinneret, 10 and 10'... Stock solution supply pipe, 11 and 11'... Yarn guide, 12 and 1
2', 12'', 12... Yarn, 13 and 13'... Separation bar, 14 and 14'... One side of the running path connecting the upper and lower rolls.

Claims (1)

[Claims] 1. A method in which a pair of rolls consisting of an upper roll and a lower roll is used to continuously process the yarn by winding the yarn around the pair of rolls in a helical shape and advancing the yarn, in which the upper and lower rolls are tied together. At least one separation bar fixed so as not to rotate is arranged on the yarn running road surface, and at least two plural yarns are introduced onto the pair of rolls in a state in which they are in contact with each other on the same running path. , each of the plurality of yarns is in contact with the separation bar, and one yarn constituting the plurality of yarns is in contact with the opposite peripheral surface of the separation bar with at least one separation bar sandwiched between the remaining yarns. When running on a running path that separates the upper and lower rolls while touching each other and connects the upper and lower rolls on the circumference of the upper and lower rolls and the upper and lower rolls on the side that are not separated by the separation bar, the separated multiple yarns are re-separated. A continuous yarn processing method characterized in that the yarns are run on the same running path in a state where they merge and are in contact with each other, and each yarn is run on a different running path from other yarns. 2 Circumscribed circle diameter d (mm) and yarn running speed V (m/
2d4800/V. 3. In a continuous yarn processing device equipped with a pair of rolls consisting of an upper roll and a lower roll, a plurality of yarn guides are arranged so as to introduce at least two plural yarns into the same traveling path on the pair of rolls, and at least one yarn is such that each of the plurality of yarns is in contact with the yarn running road surface connecting the upper and lower rolls, and one yarn constituting the plurality of yarns is in contact with the circumferential surface opposite to the remaining yarns. The circumscribed circle diameter d is fixed so as not to rotate.
(mm) and yarn running speed V (m/min) in the following relationship: 2≦d≦4800/V. 4. The continuous yarn processing device according to claim 3, wherein the separation bar is provided on one side of the lower roll rotating upward.