JPS63295754A - Method for sizing multifilament yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for sizing warp yarns for textiles using multifilament yarns, which allows for low sizing and high speed sizing.

(Prior art) Conventionally, sizing of warp yarns for multifilament woven fabrics is done by
Using a sizing agent made of a mixture of acrylic resin or similar resin and polyvinyl alcohol, the warp yarns are immersed in a sizing bath, the sizing agent is applied by sifting, and then the sizing agent is thoroughly dried. being done.

However, these gluing methods have extremely low productivity and require a large amount of drying energy and a large amount of glue, so the gluing cost accounts for a very large proportion of the manufacturing cost of the RA mold. Since a sizing agent is used, problems such as sizing accumulation and gum up occur during weaving, and many problems still remain in order to maintain a high rate of operation of the weaving machine and high quality products.

FIG. 5 shows such a typical conventional gluing method. This method is the above-mentioned dipping + squeezing sizing method, and since the thread stays in the glue bath for a long time, the glue penetrates into the thread excessively. It was necessary to lower the amount of water or increase the shibori effect. However, the former has the disadvantage that it requires a large amount of drying energy due to its high moisture content, while the latter has the disadvantage that flattening of the yarn is further promoted and weavability is reduced.

On the other hand, a roll-touch gluing method (6th method) has been proposed separately.
(see figure) can achieve low adhesion, but it has poor permeability into the threads, making it impossible to achieve uniform adhesion. In addition, in the nip method (see FIG. 7) in which the yarn does not come into contact with the roll surface, the running stability of the yarn is poor, and it is difficult to equalize the amount of adhesion.

In order to solve these problems, in recent years a method of applying oil using a direct warper instead of a sizing agent, and a so-called non-sizing method of applying interlacing treatment to multifilament, have been implemented in recent years. It is unsuitable for non-crimped multifilament yarns, high-count yarns, irregular cross-section yarns, and densely woven fabrics; However, production is limited to low-count yarns and low-density fabrics, but these also have problems such as deterioration of fabric quality due to residual ink race marks and friction of reeds during high-speed rotation. However, the current situation is that the objective has not yet been fully achieved.

(Problems to be Solved by the Invention) The purpose of the present invention is to improve the problems of the conventional gluing method as described above, such as low productivity, use of a large amount of glue, and use of a large amount of drying energy. When sizing the warp threads of multifilament fabrics, it is effective in applying a low sizing rate and uniformly adhering, increasing the sizing speed and reducing drying energy, and also has excellent weavability. The present invention aims to provide a method of gluing.

(Means for Solving the Problems) The gluing method according to the present invention for achieving these objects has the following configuration.

In other words, "When pasting a water-based sizing agent on threads for textile warp consisting of multifilament yarns, the tension is 0.1≦T≦0.5 without dipping the threads through a glue bath.
(T: Yarn tension in the upstream area of the nip point of the glue roll, grams/denier), contact length to the roll is Q<J/L≦0
．． 5 (A: Length of the yarn upstream of the nip point of the sizing roll in contact with the top roll or bottom roll, circumference of the L-nid roll or bottom roll), and the running speed of the yarn is substantially equal to A method for gluing multifilament yarn, characterized in that gluing is applied between a pair of rolls that rotate at the same circumferential speed and are arranged facing each other in sliding contact with each other. ”
This is an indispensable matter for the structure of the present invention.

(effect) The present invention will be explained in more detail below.

FIG. 1 is a side view of one embodiment of the apparatus used to carry out the invention.

The warp multifilament yarn 2 drawn out from the creel 1 is aligned into a sheet by the front lead 3, passes through the feed roll 4, and is passed through the glue bath without passing through it by dipping, so that the yarn speed is substantially the same as that of the yarn. A bottom roll 7 is guided by a guide roll 5 so as to be in close contact with the top roll 6 rotating at the same circumferential speed, is disposed facing the top roll 6 in sliding contact with each other, and is lifting the glue from the glue bath 8. A glue is applied near the nip point, and then it is dried by a known drying method, oiled, etc., and wound up.

Here, in the present invention, the yarn tension is 0.1≦T≦0.5 (where T: warp yarn tension in the upstream area of the nip point of the sizing roll・g
/d), and the contact length of the yarn with the top roll 6 is 0.
It is necessary to satisfy both of the following conditions at the same time: l/L≦0.5 (l: the length of the warp threads in the upstream area of the nip point of the sizing roll that contacts the top roll, and the circumference of the L-nid roll). be.

The tension T (g/d) is determined by the feed roll 4 as shown in Figure 2.
The value is determined by the difference in surface speed of the top roll 60 and the tension (g) measured between the feed roll 4 and the guide roll 5 using a commercially available tension measuring device. d).

Also, 1. As for L, as shown in Fig. 3, β is yarn 2.
indicates the length of contact with the top roll 6, L indicates the total circumferential length of the top roll 6, and among these, the value of l is set by the position of the guide roll 5 whose position can be adjusted up and down.

To explain further, the first important requirement constituting the method of the present invention is to glue the yarn without dipping it in a glue tank, as shown in FIG. 2 (top roll 6 and bottom roll 7). Since the glue (A) passes through the glue (A) that has been squeezed and collected for only a short time, penetration into the inside of the thread is moderately suppressed, and a thread with a low adhesion rate can be obtained.

Therefore, even if a high concentration of glue is used, it is possible to reduce the adhesion of the glue without exaggerating the shibori effect, so the moisture content of the yarn squeezed by the top roll 6 and bottom roll 7 is Compared to the normal sizing method shown in 1., it is easier to lower the ratio, thereby reducing drying energy, and the sizing yarn has a round shape suitable for weaving.

Further, the second important requirement constituting the method of the present invention is to optimize the tension T of the yarn in the sizing area. T<
When it is 0.1, the running state of the yarn becomes unstable and the operability deteriorates. Moreover, if T>0.5, the tension will be excessive, the surface of the top roll 6 will be easily damaged, and yarn breakage will occur frequently, which is unsuitable.

The third requirement is that, as shown in FIG. 3, by bringing the yarn into close contact with the top roll 6 with an appropriate contact length,
The residual glue on the top roll 6 creates a wet state in the yarn, and the yarn dissipates the accompanying air, and the accompanying air mixes into the sized yarn, reducing the strength of the glue film. The objective is to prevent the amount of adhesion from becoming non-uniform. From many experimental results, it has been found that in the case of It/L#O, the adhesion effect to the top roll 6 is insufficient (due to the accompanying air, the penetration of the glue into the yarn is poor, and the yarn running is unstable). This may cause adhesion spots, and sometimes the yarn may wrap around the roll, making operability unstable.In addition, if f/L>0.5, while the yarn runs closely on the top roll 6, The single fibers are excessively aligned on the roll, and conversely the sized yarn obtained becomes too flat, resulting in poor bundling properties, and the optimum range is O<l/L≦0.
It is necessary to set the value to 5.

In addition, as a result of numerous experiments, it has been found that T and 1/L tend to be inversely proportional, but there is no perfect correlation between T and 1/L; Depending on the yarn fineness, cross-sectional shape, number of twists, etc., it is necessary to take optimum values for T and 1/L, respectively, within the ranges defined by the present invention.

As described above, a feature of the present invention is that by setting the yarn tension and the contact length between the yarn and the top roll to conditions that satisfy the above-mentioned formula, the yarn is pre-wetted and the multifilament is The accompanying air is released, increasing the permeability of the glue into the threads, and the immersion time in the size solution can be extremely shortened, reducing adhesion without excessive squeezing at the nip. I can figure it out. As a result, it is possible to obtain a sized yarn whose convergence is appropriately ovalized even when sizing is performed at high speed.

Further, according to the method of the present invention, it is possible to apply a low adhesive ratio without lowering the glue concentration, so it is possible to reduce drying energy.

The glue used in the method of the present invention includes ordinary acrylic glue, polyester glue, and acrylic glue mixed with a large amount of wax component.

Furthermore, the multifilament yarn in the method of the present invention is
Known long fiber yarns and their processed yarns (false twisted yarns, designed yarns, etc.)
etc. are included.

Furthermore, for convenience of explanation, the top roll 6 is used as the roll that the yarn 2 comes into contact with, but the same effect can be obtained even if the yarn 2 comes into contact with the bottom roll 7 as shown in FIG. However, if the shower 9 is activated to prevent the glue on the bottom roll 7 from drying, as is usually done when the sizing machine stops during production, the glue will flow along the yarn. Since the glue adheres to and hardens on the guide roll 5, this may cause some practical problems. However, this method is applicable to the so-called beam-to-beam method, which is less likely to cause yarn breakage, and is applicable to thick denier yarns.

(Example) Example 1 The sizing method of the present invention was carried out using non-twisted polyester multifilament 50d/24fil yarn as warp yarn. The sizing agent used is a 15% aqueous emulsion solution of 70% by weight of acrylic resin and 30% by weight of emulsion wax, T=0.3 (g/d), t; / L.
When sizing was carried out under the condition of = 0.13 at a yarn speed of 250 (m/min) using the nip roll method in which the yarn was brought into contact with the top roll of this method, a sized yarn with a coating amount of 3.6% by weight was obtained.

This sized yarn was subjected to a conventional beaming process and placed in a water jet loom at 650 rpm. As a result, good results were obtained with a weaving efficiency of 98% and a C reversal rate of 0.5%.
The quality of the obtained fabric was also good, with no ground cracks or warp lines.

Example 2゜Polyester multifilament irregularly shaped ply) 50d/
36fi l, 300 (T/ When sizing was carried out under the same conditions as in Example 1, but at a yarn speed of 200 (m/min), using T/wine thread as the warp thread, it adhered! 3.5 weight 1% sizing. Yarn was obtained. When weaving was carried out at 500 revolutions using a water jet loom in the same manner, the weaving efficiency was 97.5%, the C reversal rate was 0.7%, and the results were good, with no reed wear or size drop. Ta.

(Effects of the Invention) As can be understood from the above detailed explanation, the present invention is capable of producing a multifilament material by selecting the thread tension and the contact length of the thread with the sizing roll and by adopting a nip roll sizing method. When sizing for warp threads of textiles, it is possible to improve the permeability of the sizing agent, lower adhesion of sizing threads, uniformity, and good cohesiveness, as well as increase the sizing speed and drying. It is possible to achieve energy savings and high-speed weaving while maintaining conventional quality, which are contradictory effects that were considered technically difficult in the past, but at the same time and with great efficiency. .

[Brief explanation of the drawing]

Fig. 1 is a side view of a dip + squeezing type gluing device for carrying out the method of the present invention, and Figs. 2 to 4 are side views showing each aspect of an example of a gluing section for carrying out the present invention. ,
Fig. 5 is a side view of a conventional general gluing section, Fig. 6 is a side view of a gluing section using a conventional method in which the yarn is simply touched by a gluing roll, and Fig. 7 is a side view of a gluing section using a conventional method of simply touching the yarn with a gluing roll. It is a side view of an attached part. Description of the main parts of the diagram

Claims (1)

[Claims] When sizing a water-based sizing agent to threads for textile warp made of multifilament yarns, the tension is 0.1≦T≦0.5 (T: 0.1≦T≦0.5 (T: sizing roll The yarn tension in the upstream area of the nip point (grams/denier), the contact length to the roll is 0<l/L≦0.5 (l: the yarn in the upstream area of the nip point of the glued roll is attached to the top roll or bottom roll. between a pair of rolls arranged opposite each other in sliding contact and rotating at a circumferential speed substantially equal to the running speed of the yarn, satisfying the contact length (L: circumference of the top roll or bottom roll) A multifilament yarn sizing method characterized by applying sizing to multifilament yarn.