JPH0551702B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a viscose rayon bundled yarn and a method for producing the same. BACKGROUND ART Conventionally, in order to produce bundled yarn in the viscose rayon manufacturing process, it is common to use a twisting machine in the yarn winding process. However, since the twisting machine requires a spindle that rotates at high speed, there are problems in that the energy cost for rotating the spindle is high, the failure rate is high, and maintenance costs are high. Furthermore, there is a limit to the ability of a twisting machine to impart cohesiveness to rayon yarn. For example, in fields that require high cohesiveness, such as warp use in textiles, it is necessary to use the yarn after processing, such as re-sizing, in the post-processing process. I didn't get it. Although there were twisting machines with these drawbacks, there was no other superior method for threading, so a centrifugal winding machine was used as the twisting machine in the batch process, and a ring twister was used as the twisting machine in the continuous process. It is widely practiced. Due to this current situation, bundled yarns of viscose rayon are generally in the form of twisted yarns. In the case of Kyupra ammonium rayon, the single yarns are brought into close contact during the manufacturing process to produce a non-twisted bundled yarn, but this phenomenon does not occur with viscose rayon yarn. Furthermore, a method of converging yarns using a sizing agent has been proposed for a long time in the so-called Hoffmann continuous spinning method, in which yarns are made to travel in a straight line.
For example, Japanese Patent Publication No. 35-9804 discloses a method of applying a sizing agent to the yarn by immersing a grooved roll in a sizing agent liquid bath and running the yarn through the grooves while rotating. When this method is applied to the production of viscose rayon, uneven convergence occurs, and increasing the average value to raise the lower limit of convergence causes the yarn to become stiffer and the cross section of the yarn to become flattened, resulting in the fabric of the final product. This method has many defects, such as the result of flattening the yarn cross section as a flickering defect, and this method has not become a general-purpose technique. The sizing agent used herein refers to an aqueous solution containing a polymer compound that has the ability to form a film after drying, or a film containing a polymer compound that is formed by drying the solution and forming a film. Examples of the polymer compound include polyvinyl alcohol, polyvinyl acetate, and the like. Problems to be Solved by the Invention In order to solve the above-mentioned problems caused by the sizing agent, a proposal was made to change the composition of the sizing agent.
This is done in Publication No. 12117, etc. Although these methods do improve the flexibility of yarns coated with a sizing agent, they cannot suppress the occurrence of fuzz and cut threads, and cannot completely correct the defects associated with sizing agents. These proposed technologies have not yet been commercialized because they have not been completely revised, and the special sizing agents are expensive and have new defects such as quality variations because they are produced in small quantities. The inventors of the present invention have conducted extensive research in order to solve the defects of the conventional viscose rayon yarn as described above and to produce a bundled yarn with excellent performance, and have finally accomplished the present invention. An object of the present invention is to provide a non-twisted viscose rayon bundled yarn and a method for producing the same. Means for Solving the Problems The gist of the present invention for achieving the objects of the present invention is as follows: 0.2 to 4.0% by weight of a straight oil agent is attached to the yarn, the yarn is practically untwisted, and the yarn is cut and fluffed. In a viscose rayon bundled yarn characterized in that the bundled yarn expressed in length is 70 mm or less, and in a continuous spinning method for viscose rayon, the spun yarn is guided to a pair of rolls, scouring on the pair of rolls, After drying, 0.2 to 4.0% by weight of straight oil is applied to the yarn, and the yarn is further dried for 0.07 to 0.40 s/.
The present invention provides a method for producing a viscose rayon bundled yarn, which is characterized by applying a tension of den and winding it without twisting. The viscose rayon bundled yarn of the present invention is a substantially non-twisted bundled yarn. The number of twists of the bundled yarn of the present invention obtained in an example described later is about 0.0 to 0.3 turns/m. Furthermore, the focusing property is not improved by using a focusing agent made of a polymer compound that has the ability to form a film after drying, which is conventionally used. Such a viscose rayon bundled yarn was completely unknown in the past, and is provided for the first time by the present invention. Effect The bundled yarn of the present invention is well bundled even though it is not twisted, and the bundleability of the yarn expressed by the cut fluff length described later is 70 mm or less, and the bundled yarn is uniform in the yarn length direction. It shows. Further, the cross section of the thread does not become flattened. Furthermore, the bundled yarn of the present invention has a
0.2 to 4.0% by weight of a straight oil agent, which will be described later, is attached. This oil coats the surface of the yarn and protects the cohesiveness of the yarn. The untwisted bundled yarn of the present invention can be used as the warp of a woven fabric or the weft of a jet loom, and exhibits excellent performance without causing defects such as flicker in the woven fabric. The continuous spinning process according to the continuous spinning method for viscose rayon consists of spinning, scouring, drying, and winding steps. Continuous spinning methods are usually classified according to the method of refining and drying the yarn.
In the method of the present invention, a method in which scouring and drying are performed using paired rolls is applied. The pair of rolls referred to in the present invention are Nelson type rolls (Synthetic Fiber Handbook, page 443, August 1978).
Published on the 20th, Maruzen) Kurjiyan style roll (Synthetic fiber handbook)
444 pages, published on August 20, 1978, Maruzen) drum type roll (Special Publication No. 1983-46927). When the twin rolls are applied to the scouring and drying of yarn, the yarn is spirally wound onto a roll that rotates with a plurality of roll axes tilted and travels as the rolls rotate. According to the research conducted by the present inventors, spun viscose rayon yarn can be easily loosened when it comes into contact with something that provides resistance like squeezing to the yarn, such as a yarn separation comb or a direction changing guide that changes the running direction of the yarn. It has been confirmed that there is a phenomenon in which single yarns become loose. If the point-to-roll method is applied, the yarn is simply wound on the roll and runs, and there is no resistance such as ironing, and the single yarn can run without becoming loose. According to the observations of the present inventors, during the scouring and drying process on twin rolls, the yarn rolls in a direction perpendicular to the running direction of the yarn, and during the scouring process, approximately 100 false twists are imparted to each meter of yarn; It has been found that the subsequent drying process causes more false twisting. Therefore, the cross section of the thread is circular. In addition, the yarn shrinks during the drying process that follows the scouring process.
This acts on the thread as a tension stress of 0.1 to 0.3/den
A certain amount of tension is applied. As a result, the yarn is strongly pressed onto the roll, and the single yarn sides are brought into close contact with each other. The sides of the single yarn are in close contact with each other,
The single yarn is pressed onto the rolls by tension stress and subjected to drying heat, but in this state the side surfaces of the single yarn are joined and the cohesiveness of the yarn given by false twisting is fixed. Perhaps for this reason, the yarn exhibits a certain degree of resistance to thread ironing after the scouring and drying treatment on the pair of rolls.
Further, the treatment on the roll can be uniformly performed in the length direction of the yarn. By using such a pair of rolls, a bundled yarn with uniform binding properties and a preferable cross-sectional shape can be obtained. It has been mentioned that yarn with excellent cohesiveness can be obtained by scouring and drying using twin rolls.
Yarn that can actually be used in practical use can be obtained by applying a straight oil to the yarn after drying it. That is, after drying, 0.2 to 4.0% by weight of a straight oil agent is applied to the yarn. Furthermore, the tension of the yarn is adjusted to a range of 0.07 g/den to 0.4 g/den and the yarn is wound without twisting. As a method of applying an oil to the yarn, there is a method in which an emulsion oil having an aqueous phase as a continuous phase is applied to the yarn before the middle of the drying process, but this method does not provide any cohesiveness of the yarn. Presumably, the emulsion oil permeates between the single filaments constituting the threads, thereby preventing the bonding between the hydrophilic cellulose single filaments. When a straight oil is applied to the yarn after drying, the straight oil only covers the surface of the yarn and does not penetrate between the single yarns. As a result, the straight oil has the effect of covering the outside of the bundled yarn obtained by scouring and drying using a pair of rolls and protecting the bundled property that has been imparted to the yarn. Furthermore, in the process of actually winding or rewinding the yarn, the resistance of the yarn path etc. reduces the cohesiveness of the yarn. The cohesiveness imparted to the yarn by the pair of rolls can be maintained until the final yarn use process. The amount of straight oil applied to the yarn is 0.2 to 4.0% by weight based on the weight of the yarn. If it is less than 0.2% by weight, not only will the cohesiveness of the yarn be greatly reduced due to resistance in the yarn path, etc., but also the yarn will open in the yarn path where static electricity is generated, resulting in a yarn with no cohesiveness at all. If it exceeds 4.0% by weight, the oil will adhere to the thread guide and other parts when the thread is used in a subsequent process, causing problems. A more preferred range is 0.25 to 3.5% by weight. In the present invention, the straight oil agent refers to an oil agent that is a mixture of mineral oil, animal or vegetable oil, water-insoluble fatty acid ester, or the like with an emulsifier, and may be a mixture of other components depending on the purpose of use. The emulsifier may be one commonly used, and for nonionic emulsifiers, for example,
POE-tridecyl-ter, POE-nonylphenol ether, etc. can be used, and for anionic types,
For example, potassium oleate, paraffin sulfonate, etc. can be used. Next, the thread to which the straight oil has been applied must be wound while maintaining its cohesion. For this purpose, the tension of the yarn is adjusted to a range of 0.07 g/den to 0.4 g/den so that the yarn is wound without twisting. If it is less than 0.07 g/den, the package of the wound vine yarn will be soft and will collapse during transportation, making it unusable. In addition, if it is over 0.4 g/den, the bundled yarn that has been obtained with great effort will be squeezed by the traversing traverse during winding, and the yarn will be divided into 2 to 3 bundled yarns, making it impossible to maintain the bundled property. . A more preferable range is 0.08 to 0.35 g/den. In addition, if the winding method is non-twisting, there is no mechanism to apply strong strain to the yarn, and the bundled yarn of the yarn will not deteriorate. When a twister is used, for example in a ring twister, the cohesiveness of the yarn is destroyed by the straining of the traveler. Note that the pair of rolls used in the method of the present invention may be a Nelson type roll composed of two rolls,
It may be a Courziant type roll made up of a plurality of rolls, or a drum type roll made up of a plurality of rolls. EXAMPLES The present invention will be explained below by way of examples. Example 1 75 denier/26 fil viscose rayon was spun using a continuous spinning machine, and after scouring and drying, an oil agent containing 60% by weight of mineral oil, 30% by weight of POE tridecyl ether, and 10% by weight of potassium oleate was prepared as a straight oil agent. was added to the yarn in an amount of 0.8% by weight and then wound to obtain a product yarn. The method of the present invention uses Nelson-type twin rolls to scouring and drying the yarn, and the tension during drying is up to 20g.
(0.26g/den), and winding was done without twisting using a rotary traverse cheese winder, and the tension at the time of winding was 15g (0.2g/den).
I rolled it up. Comparative Example 1 In Comparative Example 1, the yarn was refined using a Nelson-type twin roll, followed by drying using a tunnel-type hot air dryer, and winding was performed without twisting using a rotary traverse cheese winder. , and the winding tension was 15g (0.2g/den). Comparative Example 2 In Comparative Example 2, the scouring and drying of the yarn was performed using a deleter-type device that sequentially runs the yarn through a plurality of rolls whose roll axes are parallel to each other, and the winding was performed without twisting using a rotary traverse cheese winder. The winding tension was 15g (0.2g/den). Comparative Example 3 As Comparative Example 3, the yarn was scoured and dried using a Nelson-type twin roll, and the yarn was wound using a ring twister, and the yarn was twisted at 40 turns/m. At that time, the winding tension was 15 g (0.2 g/den). The cohesiveness of the yarns obtained and the quality of fabrics made from the yarns were evaluated. The results are shown in Table 1. For the cutting fluff length shown in Table 1, take 30 cm of thread, fix one end of it to the top of the measuring device, and attach 0.7 g/fuzz to the other end.
Suspend the weight of the den, cut the center with scissors, measure the length of the single yarn separated from the cutting point, and use that length as the cut fluff length. The quality of the fabric is determined by striking the weft yarns of the fabric at a density of 30 threads/cm using an air jet loom, and visually determining the presence or absence of flicker defects in the fabric.

[Table] It is clear from Table 1 that the yarn obtained by the method of the present invention is excellent in both yarn cohesiveness and fabric quality.
Comparative Example 1 in which a tunnel type hot air dryer was used for drying had low convergence. Comparative Example 2, in which parallel rolls were used for drying, had poor cohesiveness and poor fabric quality. Furthermore, in Comparative Example 3, in which a ring twister was used for winding, the yarn had poor cohesiveness, indicating that the ring twister destroyed the yarn cohesiveness. Furthermore, 30g of each of the obtained threads was wound around a twisting bobbin and twisted 1500 times/m using a twister.
I then looked at the suitability of the threads used for twisting. The suitability was determined by visually counting the surface fuzz of the wound cylinder, and the less surface fuzz there was, the more suitable it was.
The results are shown below. Method of the present invention... Number of surface fuzz: 4 Comparative example 1... Number of surface fuzz: 40 Comparative example 2... Number of surface fuzz: 35 Comparative example 3... Number of surface fuzz: 20 In the up twister, the threads on the surface of the twisted yarn bobbin during twisting. The unraveled and twisted yarns touch each other and run while rubbing, but yarns with excellent cohesiveness are less likely to generate fuzz due to rubbing. As mentioned above, the yarn obtained by the method of the present invention has excellent cohesiveness, and therefore has high suitability for twisting. Example 2, Comparative Examples 4 and 5 Viscose rayon bundled yarns were produced according to the method of the present invention in Example 1, and the tension at the time of winding was changed as follows for comparison. Tension at the time of winding 26g (0.35g/den) Tension at the time of winding 4g (0.05g/den) Tension at the time of winding 40g (0.5g/den) Example 2 wound with a tension at the time of winding 26g The yarn had a cut fluff length of 45 mm and had high cohesiveness. In the case of the yarn of Comparative Example 4, which was wound with a tension of 4 g during winding, the wound cheese was soft and only the cheese could be obtained that was unrolled during the transportation process. The yarn of Comparative Example 5, which was wound with a tension of 40 g at the time of winding, was a yarn that was broken into several yarns and lost its cohesiveness. Effects of the Invention According to the method for producing the viscose rayon bundle of the present invention, the bundled yarn of the present invention is well bundled even though it is substantially untwisted, and the yarn is expressed by the cut fluff length. The convergence is 70 mm or less, and the convergence is uniform in the yarn length direction. Furthermore, since the straight oil agent is attached in an amount of 0.2 to 4.0% by weight based on the weight of the yarn, the oil agent covers the surface of the yarn and protects the cohesiveness of the yarn. The untwisted bundled yarn obtained by the method of the present invention exhibits uniform binding properties and can be used as the warp of a woven fabric or the weft of a jet loom, and does not cause defects such as flicker when made into a woven fabric. Furthermore, even when used in the post-processing step of twisting, it exhibits processing performance superior to conventional products.

Claims (1)

[Claims] 1. 0.2 to 4.0% by weight of straight oil is attached,
1. A viscose rayon bundled yarn, which is substantially untwisted and has a binding property expressed by cut fluff length of 70 mm or less. 2. In the continuous spinning method for viscose rayon, the spun yarn is guided to a pair of rolls, scoured and dried on the pair of rolls, and then 0.2 to 4.0
% by weight of straight oil, and then
A method for producing a viscose rayon bundled yarn characterized by applying a tension of 0.07 to 0.40 g/den and winding without twisting. 3. Claim 2, characterized in that the pair of rolls is a Nelson type roll consisting of two rolls.
A method for producing a viscose rayon bundled yarn as described in 2. 4. The method for producing a viscose rayon bundled yarn according to claim 2, wherein the pair of rolls is a Courziant type roll consisting of a plurality of rolls. 5. Claim 2, characterized in that the pair of rolls is a drum type roll consisting of a plurality of rolls.
A method for producing a viscose rayon bundled yarn as described in 2.