JPS5813666B2 - How to process crimped yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for processing crimped yarn, and more specifically, the present invention relates to a method for processing crimped yarn, and more specifically, it performs sizing treatment in the crimping process of continuous multifilament yarn, and collects it without impairing the physical properties of the crimped yarn. The present invention relates to a method for treating crimped yarn, which can impart properties to the crimped yarn and allow weaving without sizing in the weaving preparation process.

Conventionally, when weaving a crimped yarn as a warp, the crimped yarn used as the warp is sized using a warping sizer or a roller sizing machine to give the crimped yarn cohesiveness. It is necessary to improve the weaving preparation operability such as pulling heddles and reeds by suppressing the crimpability or threadability of the weaving process. Since the binding properties of the crimped yarn deteriorate due to frictional impact with the reed or heddle, it was necessary to prevent the weaving performance from deteriorating.

However, the sizing process not only requires special equipment, but also requires a large amount of thermal energy to keep the sizing solution warm and dry the sizing yarn, and it is difficult to increase production speed to ensure drying time. Therefore, a lot of labor is required for the gluing operation, and this occupies a very large proportion of the textile manufacturing cost.

Furthermore, sizing requires a high level of skill, and if tension management or sizing mixing is not appropriate, weavability and fabric quality are likely to deteriorate significantly.Moreover, the processed yarn is heat-set during the drying process, making it impossible to wind it. It was also a process with many problems, such as deterioration of shrinkage properties.

Therefore, attempts have been made in the past to omit this complicated sizing process, and for some thermoplastic synthetic fiber multifilament yarns, an oil agent is applied during the spinning and drawing process to improve smoothness. Alternatively, some have succeeded in weaving without the gluing step by combining interlacing of the single yarns with fluid treatment and also imparting convergence.

However, in the case of crimped yarn, even if such technology is adopted, it is not possible to sufficiently suppress the crimpability or curling ability of the crimped yarn, so weaving preparation operability is extremely poor, and there are significant problems in the weaving process. In addition to the generation of fluff, there are also negative aspects such as the entangled crimped yarns losing bulk and reducing the texture of the fabric, so in reality, gluing in the weaving preparation process cannot be omitted. Ta.

In view of the current situation, the present inventors have developed a method that does not require gluing in the complicated weaving preparation process, minimizes the necessary costs involved in the process, has good weavability, and has the crimp effect obtained in the texture processing process. As a result of extensive research into methods for producing crimped yarns that can be stored as they are, the processing method of the present invention, which achieves the intended purpose, was obtained.

That is, in the crimping process of continuous multifilament yarn, the present invention applies a sizing agent alone or a sizing liquid containing a sizing agent and an oil agent to the crimped yarn after crimping and before winding the yarn into a package. It improves weaving preparation operability by imparting convergence and appropriate smoothness, and exhibits weaving efficiency equal to or higher than sizing yarn that has gone through the conventional sizing process. The object of the present invention is to provide a method for processing crimped yarns that can improve the quality of woven fabrics.

To explain the present invention in more detail, when crimping is performed using synthetic fiber multifilament yarn such as polyester or polyamide yarn, or semi-synthetic fiber multifilament yarn such as Promix, by false twisting or pressing. After the crimping process and before winding it into a package, a sizing agent alone or a sizing solution that is a mixture of a sizing agent and an oil agent is applied to the thread so that it is wound into a package in a wet state without drying. .

Here, after crimping, sizing is performed before winding into a package to obtain weaving preparation workability and weaving performance that are equivalent to or better than sizing crimped yarns that are sized in the conventional weaving preparation process. As a result of various studies on the characteristics that should be imparted to crimped yarns, we found that crimped yarns, compared to multifilament yarns that are not crimped, have the ability to crimp or roll easily within a single yarn. The filaments tend to separate from each other, and when arranging the yarns in a sheet form, the filaments of adjacent yarns tend to become entangled, resulting in extremely disadvantageous conditions. It is especially necessary to provide a high degree of cohesiveness so that the filaments within the single yarn do not separate from each other due to temporary pressure to some extent. They reached the conclusion that the oil agent used alone was insufficient to impart binding properties, and that a glue agent with excellent adhesive properties had to be used.

Suitable sizing agents used in the present invention include polyvinyl alcohol sizing agents, polyacrylic sizing agents, etc., which have been conventionally used for sizing in the weaving preparation process, singly or in mixtures thereof, and mineral oil, A mixture of oils made of higher resin acid esters, ethylene oxide adducts of higher alcohols, etc. can be used, but particularly preferred glues are polyacrylic glues that maintain a certain degree of adhesion while minimizing stickiness. A sizing agent is preferable; for example, a sizing agent mainly composed of butyl acrylate is better than a sizing agent mainly composed of ethyl acrylate, and an oil agent containing higher alcohol ether, ethylene oxide anion compound, etc. is mixed with the sizing agent to improve smoothness. By doing so, the frictional resistance when the thread passes is reduced, which improves subsequent handling.

However, if too much oil is added, the focusing effect of the size liquid will be significantly reduced, so it is desirable to keep the amount mixed with the size liquid within a range of 50% or less, preferably 30% or less, by weight.

In addition, if a sizing agent is applied to the multifilament yarn before crimping, the sizing agent will adhere and accumulate in the yarn path of the crimping machine, which will not only deteriorate the thermal efficiency for crimping but also cause a large amount of scum to adhere. This is undesirable as it significantly reduces workability, so it must be attached after the crimping process.

What is important here is that after applying the sizing agent, the concentration of the sizing agent and the amount picked up on the crimped yarn are set within appropriate ranges in order to enable continuous operation without contaminating the yarn path.
This involves winding the material into a package while it is still wet without drying.

A size solution with a concentration of 8 to 11%, such as that used in the normal sizing process, dries in a very short time after adhering to the yarn, forming a scum, staining the yarn path, and driving the winding package. It is practically unusable as it is deposited on the drum.

In order to solve this problem, the concentration of the size solution is significantly reduced so that even when it is air-dried during winding, it is not easily concentrated, and moreover, threads with a low concentration of size solution are always passed over it. It is essential to prevent the buildup of glue.

Therefore, it is necessary that the concentration of starch axillary be small, in the range of <0.3 to 5%.

If the concentration of the size liquid exceeds 5%, the size will precipitate on the yarn guide or take-up drum as described above, which will deteriorate the operability or make it extremely difficult to unwind the yarn from the wound package. Otherwise, the filament may break and become unusable as a warp, so the glue concentration should be 5%.
It should be kept below.

On the other hand, if the concentration is less than 0.3%, there is a limit to the amount of size liquid that can be picked up, and it will not be possible to give the crimped yarn a satisfactory focusing effect, so the concentration must be kept at 0.3% or more.

In addition, the amount of pick-up to the thread is now determined by the concentration of the size liquid A (%
) AP/
If K is set as shown by the formula 100=K (0.3≧A≧5.0), the amount of pick-up to the thread can be adjusted so that the K value falls within the range of 0.1≦K≦50. It is necessary to decide.

The K value is the product of the concentration (%) of the size liquid and the amount picked up on the yarn (% by weight of the yarn) divided by 100, and is a measure of the amount of size attached to the crimped yarn (corresponding to the rate of glue adhesion). ).

In order to obtain the focusing effect that achieves the desired purpose, it is necessary to limit the amount of glue deposited so that the K value is in the range of 0.1 to 5.0, and if the K value exceeds 5.0, If the adhesive force between the yarns in the package becomes too strong, the yarn unwinding property becomes extremely poor, leading to filament breakage, and on the other hand, if it becomes less than 0.1, a sufficient focusing effect cannot be obtained.

The method of attaching the size liquid to the crimped yarn is not limited to the following, but an oiling roller method in which the lower part is immersed in the size liquid and the yarn slides on the surface of a rotating roller is simple, reliable, and convenient. It is.

The amount of size liquid picked up by the crimped yarn is adjusted by changing the roller rotation speed or by changing the contact length of the yarn with the roller.

That is, if the rotational speed of the rotating roller is increased or the contact length of the yarn is lengthened, the amount of size liquid picked up by the yarn increases.

The crimped yarn to which the size liquid has been applied in this way is not actively dried and is wound up into a package while still wet, but the yarn tension during winding affects the cohesiveness of the crimped yarn and the package drying efficiency, which will be discussed later. It is important to be careful as this will have a significant impact on

In other words, if the winding overfeed ratio of the crimped yarn is increased and soft winding is performed, the yarn tends to be wound bulky and the cohesiveness decreases.On the other hand, if the winding overfeed ratio is decreased, the package Since the hardness of the yarn tends to increase and the drying efficiency tends to decrease, it should be set in consideration of the crimp characteristics of the yarn and the concentration of the size liquid to be attached.

Generally, it is best to wind the package with an overfeed ratio of +4 to +15%, but in this case, the important point is to keep the winding tension uniform.If there is a fluctuation in the winding tension, the size liquid The amount of adhesion varies, yarn unevenness with uneven convergence occurs, and the yarn becomes uneven when warped in the weaving preparation process, which has a significant negative effect on weavability and fabric quality.

Therefore, it is necessary that the winding tension can be sufficiently controlled in the process of applying the size liquid, and it is particularly preferable to carry out the process using a crimping machine that can control constant tension.

Furthermore, the twill angle when winding the crimped yarn into a package is also an important condition.

In other words, it is important to increase the twill angle to a certain extent so that adjacent yarns do not come into contact with each other when wound, to ensure smooth peeling when unwinding, and to increase air gaps to promote air drying after sizing. A winding angle of 10 to 20 degrees (with respect to the edge line of the package), which is sufficient for winding it into a cheese shape using a normal crimping machine, is sufficient.

However, if the winding angle is made too large than necessary, the winding speed will be reduced and mechanical vibration may occur, which is not preferable.

Next, the crimped yarn wound into the package is dried in the package state to give it cohesiveness, but actively heating the package to dry the package is not only economically disadvantageous, but also improves the quality of the yarn. Since this can easily cause changes, the yarn should be gradually air-dried, such as by leaving it in a room with a normal factory atmosphere temperature and humidity (15-30℃, 40-80%), so that the moisture content is 15% or less, preferably 5% based on the weight of the yarn. % or less.

The standing time varies depending on the amount of pick-up of the size liquid, the winding hardness of the package, the structure of the winding core, etc., but for a normal size (approximately 1.5 kg) package rolled up under the conditions of the present invention, it will be left under standard temperature and humidity conditions (20°C x Since it can be dried to a predetermined moisture content by leaving it in an atmosphere of 65% RH for about 120 to 200 hours, it can be used for practical purposes in subsequent handling steps.

In order to improve the drying efficiency, it is quite possible to improve the drying efficiency by making the package core have a porous structure K with a high porosity (area ratio of the voids to the circumferential surface area of the core) to allow moisture evaporation from the inner layer of the package yarn. Effective, with a porosity of about 70%
This has the effect of shortening the drying time by about 30%.

The crimped yarns that have been air-dried and given bundling properties have not been subjected to any special heat treatment compared to the warp yarns that have been pasted and dried by the conventional method, so they are superior in the ability to retain crimps.

Regarding handling, it is warped and beamed according to the number of warp threads of the fabric in the same way as conventional yarns, then heddled and reeded, set on a loom, and woven in the same manner as conventional yarns.

The effects of the crimped yarn processing method of the present invention are summarized as follows.

■ It exhibits weaving preparation operability and weaving efficiency that are equivalent to or better than crimped yarn that has been sized in the weaving preparation process,
Compared to conventional methods, it is possible to significantly reduce manufacturing costs.

■ Sizing liquid can be attached to each crimped thread using a crimping machine that can control constant tension, giving stable and reliable binding, making it similar to the traditional sizing process. Since there is no need for heat or long processes, yarn quality can be maintained at a high level, and high-quality fabrics can be obtained with very little operational trouble.

Examples will be described below.

Example 1 A 75-denier 36-filament polyester multifilament yarn was false-twisted using a serial false-twisting machine under the conditions shown in Table 1, and before winding it into a package, it was mixed with an acrylic glue mainly containing butyl acrylate. The sizing process is carried out using a one-way oiling roller using a 1.8% sizing liquid mixed with an oil agent containing higher alcohol ether and an ethylene oxide anion compound (mixing ratio 5:1), leaving it wet without drying. It was wound onto a press bobbin with a porosity of 63% at a winding angle of 14°30'.

At this time, the amount of size liquid picked up on the thread (to thread weight) is 40
．． It was 2%.

Next, the package was placed in a room at 27°C x 60% RH for 120 minutes.
After leaving it for a while (the moisture content with respect to the amount of winding yarn had dried to below 3.2%), warping beaming was carried out, and the total number of warps was 4150, warp density 88/inch, and weft density 78.
80 in water jet loom as a plain weave of 1/2
As a result of anti-weaving, the thread breakage and fuzz occurrence rate during weaving was 0.02
The fabric exhibited almost the same good weavability as a fabric using yarn that had undergone a conventional sizing process.

However, the thread breakage and fuzz occurrence rate is the value obtained by dividing the number of thread breakages and fuzz that occur during weaving by the total woven length (unit: meters).

In addition, the fabric quality of the thus obtained gray fabric after dyeing was excellent in bulk, and exhibited a quality equal to or higher than that of fabrics using conventional sizing threads.

Example 2 Using a series false twisting machine, polyester multifilament yarn 150 denier 48 filament was false twisted under usual conditions, and acrylic sizing agent was applied before winding (take-up overfeed ratio +6.2%). A solution of 1.5% concentration was applied in the same manner as in Example 1, and without drying, the material was wound onto a porous plastic bobbin with a winding angle of 14°30' and a porosity of 70%.

At this time, the pick-up amount of size liquid (relative to yarn weight) was 58%.

Next, the package (pure yarn amount: 1.3 kg) was heated at 26°C
After being left in a room at 66% RH for 130 hours (the moisture content relative to the amount of winding threads had dried to below 2.8%), warping and beaming warp threading were performed to achieve a total number of warps of 6010 and warp density of 85 warps/inch. As a result of weaving 55 weaves in a shirt loom with a satin fabric with a weft density of 65 threads/inch, the thread breakage and fuzz generation rate during weaving was 0.012, and the number of threads that had been pasted through the conventional sizing process was 0.012. Woven fabric (thread cut, fluffing rate 0.01
~0.02), and the quality of the fabric after dyeing was also high quality with excellent bulkiness.

Claims (1)

[Scope of Claims] 1. In the crimping process of continuous multifilament yarn, after crimping and before winding the yarn into a package, a sizing agent alone or a sizing agent mixed with a sizing agent and an oil agent is used to reduce the sizing liquid concentration. is 0.
3 to 5.0% and the amount picked up to the yarn is 0,1≦A,P/1 00≦5.0 However, A...Size concentration (%) P... A method for processing crimped yarn characterized by performing sizing treatment so as to satisfy the relationship of the amount of big up (% of yarn weight) and winding the yarn without performing drying treatment.