JP2683240B2 - Multifilament yarn sizing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sizing method for multifilament yarns.

[Conventional technology]

Generally, when manufacturing a woven fabric, after a warping step, a sizing treatment is applied to a yarn used as a warp to give a sizing agent in order to give a certain level of convergence and smoothness.

The sizing process is usually performed using the present sizing machine as shown in the drawing. In the figure, reference numeral 1 denotes a sizing agent supply tank which performs sizing by passing a yarn through the tank. The glue squeezing rollers 2 and 3 squeeze excess glue adhering to the yarn. Reference numeral 4 denotes a drying chamber, which has a built-in heater for drying the glued yarn. 5 and 6 are drying cylinders, which also have a built-in heater for drying the yarn. 7 is a beam for winding the warp. The drying chamber 4 and the drying cylinders 5 and 6 are collectively called a drying zone.

In the sizing treatment using the above apparatus, the sizing and drying conditions are usually set as follows from the viewpoint of improving the yarn convergence and preventing sticking of the sizing yarn in the beam. That is, the application of the sizing agent is set so that the sizing agent adhesion amount after drying is 5 to 10% by weight, and the drying temperature in the drying zone is set to 100 ° C. or higher.

[Problems to be solved by the invention]

However, when the sizing treatment is performed by such a sizing machine, although the trouble in the weaving process can be prevented, the yarn causes heat shrinkage due to the heating in the drying process, and in the processing process (relax process) following the weaving process, No effective heat shrinkage can be obtained. Therefore, there is a problem in that even if the yarn is given a heat shrinkage property in the manufacturing process, the heat shrinkage property is not sufficiently utilized.

The present invention has been made in view of such circumstances,
An object of the present invention is to provide a method for sizing a multi-filament yarn having a heat shrink property without impairing the heat shrink property.

[Means for solving the problem]

In order to achieve the above object, the sizing method of the multi-filament yarn of the present invention uses a multi-filament yarn having an interlacing number of 30 / m or less as a warp, and using this yarn, a sizing agent supply tank in which a sizing agent is stored. And then immediately after that, a predetermined amount of glue is applied to the yarn by squeezing excess glue between at least a pair of glue squeezing rollers, and then the yarn is run horizontally in the dry chamber. The sizing method is such that it is dried while being dried along with the outer periphery of the drying cylinder, and is then wound into a beam. % So that the drying temperature in the drying zone consisting of the drying chamber and the drying cylinder is 90 ° C. or lower,
The yarn tension in the drying zone is set to 0.2 g / d or more, and the residence time of the yarn from the final size squeezing roller to the beam winding section is increased.
By setting the thermal stress peak stress ratio of the yarn to 25 seconds or less, the stress (Si) after sizing / the stress (So) before sizing is set to 0.5>.

[Action]

That is, the present invention is intended for a multifilament yarn having an entanglement number of 30 pieces / m or less that requires a sizing treatment, and requires the heating temperature and the amount of sizing agent attached when sizing by the present sizing machine as shown in the drawing. In addition to being minimized, the yarn tension in the drying zone is set to a specific value, and the speed of the yarn passing through the drying zone is set to a specific value to minimize the change in the heat shrinkage characteristics of the yarn. Therefore, in the multifilament yarn that has been subjected to the sizing treatment of the present invention, conventionally, a large amount of sizing agent was applied by the present sizing machine and the heat shrinkage property was lowered by drying under severe conditions, whereas The above-mentioned heat shrinkage property is sufficiently retained even after sizing, and it is characterized in that it can be sufficiently heat shrunk in the processing step (relax step) to form a fabric of excellent quality.

 Next, the present invention will be described in detail.

The yarn targeted by the present invention is a multifilament yarn having an interlacing number of 30 / m or less. This is because the filament yarn having an intertwining number of more than 30 / m has sufficient weaving characteristics only by applying oiling treatment after warping, and is not normally sized.

Then, in the sizing method of the present invention, when sizing with the present sizing machine as shown in the drawing, the sizing agent is first applied so that the amount of the sizing agent attached after drying is 5% by weight or less. This condition was set from the viewpoint that the larger the amount of sizing agent attached, the worse the drying properties of the sizing yarn and the more heat required to dry it. The amount of sizing agent to be dried was limited. However, in the above range, if the number of entanglements is large or the yarn is twisted (sweet twist of 500 T / M or less), the amount of the sizing agent attached is reduced. When the warp density of the woven fabric using this yarn is low, the amount of the sizing agent attached is reduced, and conversely, when the woven fabric has a high warp density, the attached amount of the sizing agent is increased.

Further, in the sizing method of the present invention, the condition is that the drying temperature in the drying zone consisting of the drying chamber and the drying cylinder is set to 90 ° C or lower. This condition
When drying at a temperature above 90 ° C, the heat shrinkage characteristics of the yarn tend to be impaired depending on the level of the drying temperature, but this degree of difference in heat shrinkage characteristics affects the texture of the cloth after dyeing and processing. It was set based on the experimental results that there is almost no effect. The drying temperature is 70 to 90 in particular.
It is preferable to set the temperature within the range of ° C. This is because at a temperature lower than 70 ° C., the yarn is not sufficiently dried unless the yarn speed is considerably reduced, and the yarns tend to stick to each other and fluff during the aging.

Furthermore, in the sizing method of the present invention, the yarn tension in the drying zone is set to 0.2 g / d (d: denier) or more. This condition is set from the viewpoint that if the yarn is not subjected to a constant tension at the time of drying, the heat shrinkage of the yarn reduces the convergence of the yarn. Applying the tension in this way is effective because the shrinkage difference does not become apparent particularly in the differently shrinkage mixed fiber yarn and the like. The yarn tension is preferably set within the range of 0.2 to 0.4 g / d.
This is because if the yarn tension exceeds 0.4 g / d, the texture of the resulting processed fabric tends to deteriorate.

Further, the sizing method of the present invention is conditioned on that the residence time of the yarn from the final size squeezing roller to the beam winding section is set to 25 seconds or less. Here, the “from the final glue squeezing roller to the beam winding portion” means, for example, the portion indicated by A from the glue squeezing rollers 2 and 3 to the beam 7 in the drawings. This condition was set from the viewpoint that it is necessary to limit the time for drying and heating, because the heat shrinkage property loss of the yarn increases if the heat history time is long even if the drying temperature is low. is there. In addition, such a time limitation on the drying and heating leads to a reduction in the time required for the sizing step, and has a great economic advantage.

In the sizing method of the present invention, by adjusting according to the above four conditions, the ratio of the peak stress of the thermal stress of the yarn before and after the sizing can be calculated as follows:
It is necessary to make the stress (So) before sizing> 0.5. This condition is set from the viewpoint that an index as to whether or not the heat shrinkage property of the yarn is maintained is required. In addition, the above-mentioned "thermal stress" indicates a force that contracts when the yarn is heated, and particularly "thermal stress peak stress"
Is a value obtained by measuring with a thermal stress measuring machine manufactured by Kanebo Engineering. In order to obtain a fabric having a good texture by shrinking the yarn in the dyeing / processing step, it is desirable that the yarn before the treatment has a high heat shrinkage rate and a high heat stress. However, since the molecular structure progresses toward stabilization in drying after sizing, the thermal stress peak stress after drying decreases. Therefore, it was decided to adjust the drying condition, and thus the gluing condition, so that the thermal stress peak stress would not drop below half of the value before sizing. If the thermal stress peak stress does not drop to less than half of the value before sizing, sufficient thermal contraction is developed in the dyeing / processing step, and a good texture can be obtained.

 Next, examples will be described together with comparative examples.

[Example 1] 80 ^d / 48 ^f △ Different cross-section bright mixed shrinkage yarn (40 ^d / 24 ^f × 40
^The sizing was performed by using a thread having an interlacing number of 24 pieces / m at ^d / 24 ^f ) and being hung on a sizing machine shown in the drawing. At this time, set the yarn speed to 55m / min (the residence time of the yarn from the final squeezing roller to the beam winding section is 20 seconds), the drying temperature to 85 ° C, and the drying tension in the chamber to 2.5g / d. A warp yarn having a sizing weight of 3% by weight was obtained. When a pulse was woven using this warp, a woven fabric having good weaving properties, inconspicuous interlaced marks of the processed fabric, and a good texture was obtained.

 The woven fabric standards for the palace are as follows.

<Palace woven fabric standard> Warp 80 ^d / 48 ^f △ Cross-section Bright different shrinkage mixed yarn Warp density 150 yarns / inch (raw machine) Weft 100 ^d / 48 ^f ○ Cross-section semi-dal 1000T / MS: Z = 2: 2 Weft density 80 Book / inch (raw machine) [Example 2] The drying temperature in sizing was set to 70 ° C. A warp was obtained in the same manner as in Example 1 except for the above. In this yarn, the sizing agent was not sufficiently dried, and the yarns tended to stick and stick together during beaming.

[Comparative Example 1] The drying temperature in sizing was set to 100 ° C. A warp was obtained in the same manner as in Example 1 except for the above. This yarn had no problems in warping and weaving, but the texture was impaired when it was processed and processed.

[Comparative Example 2] The same yarn as that of Example 1 was used, but the number of entanglements was 0. A warp was obtained in the same manner as in Example 1 except for the above.
This yarn could not be woven because it fluffed during weaving.

[Comparative Example 3] The same yarn as in Example 1 but having an interlacing number of 37 / m was used. A warp was obtained in the same manner as in Example 1 except for the above. When this yarn was processed and processed, interlaced marks were conspicuous and the surface of the fabric was deteriorated, resulting in a low quality woven fabric.

[Example 3] The drying tension in the chamber during sizing was set to 0.6 g / d. A warp was obtained in the same manner as in Example 1 except for the above. This yarn had a high residual thermal stress after sizing, but did not have a very good feel when processed and processed.

[Comparative Example 4] Drying tension in the chamber during sizing was 0.15 g / d.
Set to. A warp was obtained in the same manner as in Example 1 except for the above. This yarn had a low residual thermal stress after sizing, and when processed into a textured fabric, it had a poor texture.

[Comparative Example 5] The amount of the sizing agent attached during sizing was set to 7% by weight based on the dry weight. A warp was obtained in the same manner as in Example 1 except for the above. The yarn could not be warped due to insufficient drying of the sizing agent.

[Comparative Example 6] The yarn speed in sizing was set to 30 m / min (the residence time of the yarn from the final size squeezing roller to the beam winding portion was 35 seconds). A warp was obtained in the same manner as in Example 1 except for the above. This yarn had a low residual thermal stress after sizing, and when processed into a textured fabric, it had a poor texture.

 The results are summarized in the table below.

[Advantages of the Invention] As described above, when the sizing method of the present invention is used to perform sizing with the present sizing machine, the heat shrinkage characteristics of the warp yarn are not impaired by the sizing treatment,
By weaving using this yarn, a woven fabric having a better swelling than that of the conventional one can be obtained by relaxing in the processing step. Further, in the relax process, the entire fabric is largely shrunk in the warp direction due to the heat shrinkage of the warp yarns.
A dense fabric can be obtained.

[Brief description of the drawings]

The drawing is an explanatory view showing the configuration of the present sizing machine used in one embodiment of the present invention. 2,3 …… Adhesive squeezing roller, 4 …… Drying chamber, 5,6 ……
Drying cylinder, 7 ... Beam

Claims (1)

(57) [Claims] 1. A multifilament yarn having an intertwining number of 30 / m or less is used as a warp, and this yarn is passed through a sizing agent supply tank in which a sizing agent is stored, and immediately after that, at least a pair of squeeze filters. A predetermined amount of sizing is applied to the yarn by squeezing excess sizing agent between the rollers, and then the yarn is dried while running horizontally in the drying chamber, and then run along the outer circumference of the drying cylinder. A sizing method in which the sizing method is such that the sizing agent is dried while being rolled up, and then wound into a beam, in which a sizing agent is applied so that the amount of sizing agent attached after drying with a drying chamber and a drying cylinder is 5% by weight or less. And the drying temperature in the drying zone consisting of the drying cylinder is 90 ° C. or less, the yarn tension in the drying zone is 0.2 g / d or more, and the yarn from the final squeezing roller to the beam winding portion is A multi-filament yarn characterized in that the thermal stress peak stress ratio of the yarn is set to be stress after sizing (Si) / stress before sizing (So)> 0.5 by setting the residence time to 25 seconds or less. Sizing method.