JPS5851048B2 - Method for producing crimped thread without streaks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing crimped yarn without myositis.

More specifically, the present invention relates to a method for processing a crimped yarn in which a thermoplastic synthetic fiber is preheated and then fine bends are given to the filament yarn using a heated jet fluid, or a loop or a walnut is formed.

Conventionally, methods for producing bulky processed yarn (crimped yarn) include:
It is described in patents related to heated compressed fluid treatment such as Japanese Patent Publication No. 44-13226.

According to these manufacturing methods, the pressure energy of the compressed fluid and the thermal energy of the heated fluid are used as energy for imparting crimp.

Furthermore, in order to effectively use the thermal energy, a method is often used in which the yarn is heat-treated in advance before being treated with a heated compressed fluid.

However, according to this method, when processing with a heated jet fluid, increasing the pressure energy or thermal energy of the fluid increases the thermal shrinkage rate (denier increase rate) during processing of the yarn.

This is because, as a matter of course, the yarn contracts in response to applied pressure or thermal energy.

At the same time, the fine structure of the yarn is stabilized, and accordingly, the dyeability is improved.

In other words, if the pressure or thermal energy of the heated jet fluid is increased, the dyeing property becomes easier and the dyeing becomes deeper.

In other words, as the denier increases (the greater the shrinkage during processing), the dyeability becomes better and the dyeing becomes deeper.

On the other hand, the crimping wheel length imparted to the yarn (yarn length at 12 = 0.00211/d) naturally depends on the pressure and thermal energy (pressure and temperature) of the heated injection fluid, but at the same time It also depends on the preheating temperature of the strip, and its contributing effects are complex and show interesting results.

In other words, the effect of thermal history during processing on the crimp rate is as shown in Figure 1. A shrunken yarn (bulky processed yarn) can be obtained.

Here, the horizontal axis shows the thermal shrinkage rate during processing, the vertical axis shows the crimp rate of the obtained crimped yarn, and the plot of the graph uses the preheating temperature before fluid treatment as a parameter.

As mentioned above, the thermal shrinkage rate during processing is determined by the pressure or thermal energy during fluid processing.

As is clear from Fig. 1, the curve of the crimp rate against the heat shrinkage rate during processing is an upwardly convex quadratic curve, and the crimp rate given at a certain heat shrinkage rate is maximum, and if the crimp rate is lower than this or If high heat shrinkage processing is performed, the crimp rate will be low.

The relationship between the crimp rate obtained in this way and the myositis of the carpet is that the higher the crimp rate is, the more likely it is that when the carpet is made into a tufted carpet, the myositis will appear to be lighter in color.

Therefore, when performing the preheating/heating injection fluid processing of yarn as described above, the crimp rate and the heat shrinkage rate during processing will vary slightly due to process variations, resulting in poor crimpability and dyeing. It has the disadvantage of causing myositis when used as a carpet or the like due to gender differences.

The object of the present invention is to provide a method for producing a uniform bulky textured yarn that is unlikely to cause myositis in carpets or the like due to such non-uniform dyeability and crimpability.

In order to overcome the above-mentioned drawbacks, the inventors of the present invention conducted intensive studies on the dyeability, and found that the dyeability of the processed yarn is better with respect to the heat shrinkage rate during processing. The tendency of myositis in tufted carpets with respect to the crimp ratio is that the higher the crimp ratio, the more the myositis appears to be lighter in appearance. It was concluded that if the processing is carried out, a bulky textured yarn with uniform myositis in carpets can be obtained.

That is, the present invention has been made based on this knowledge, and provides a heated injection fluid treatment nozzle which preheats a filament yarn made of thermo-dry synthetic fiber to a temperature higher than the secondary transition temperature of the filament and has a temperature higher than the secondary transition temperature of the filament. A method of manufacturing crimped yarn by supplying filaments in an overfeed state with a width of at least 30 mm or more, and subjecting the filaments to a heated fluid injection process using the nozzle to bend individual filaments or entangle them with each other to form loops or walnuts. In , the thermal shrinkage rate (increase rate of denier) during heated fluid injection processing is Y (@ and the yarn preheating temperature when supplied to the heated injection fluid processing nozzle is This is a method for producing a crimped yarn that is less likely to cause myositis in carpets, which is characterized by carrying out preheating treatment and heated injection fluid processing within a range where the thermal contraction rate Y (to) is within the following general formula.

Hereinafter, the present invention will be explained based on FIGS. 1 and 2.

As mentioned above, Figure 1 is a diagram showing the relationship between the heat shrinkage rate (@) and the crimp rate (to) of the crimped yarn during processing, and Figure 2 is a diagram showing the relationship between the yarn preheating temperature C
C) and the thermal shrinkage rate during processing (@).

As mentioned above, in the heated injection fluid processing according to the present invention, in the relationship diagram between heat shrinkage and crimp ratio during processing shown in FIG.
The crimp ratio reaches a maximum at a certain heat contraction, and the crimp ratio is lower than this maximum value (lower crimp ratio side).

The thermal shrinkage rate during processing at which the crimp rate reaches its maximum value depends on the preheating temperature before fluid treatment.

That is, this maximum value is expressed as a linear function of the preheating temperature,
This is plotted in Figure 2 as Y=38.8-
-X straight line.

Therefore, if the processing is carried out in the area below the straight line Y=38.8--X in 253 Figure 2, even if the processing conditions change slightly due to process variations, for example, the thermal shrinkage rate during processing will be If the value becomes low, light staining occurs.

However, at the same time, the crimp rate decreases, and as a result, the tufted carpet appears to be darkly dyed, but in reality, the light dyeing and dark dyeing cancel each other out, resulting in uniformly crimped threads with myositis.

However, if the thermal shrinkage during processing is reduced too much, the crimp rate also becomes low, especially if it becomes less than 10, the performance as a bulky crimp will deteriorate, the tufting property in high-order processing will be poor, and When used in carpets, etc., the yarns lack bulk and are undesirable.

Therefore, the optimal processing conditions are conditions in which the crimp ratio in FIG. 1 is 10% or more.

The heat shrinkage rate during processing to obtain this crimp rate of 10% can also be expressed as a function of the preheating temperature of the yarn, and if we calculate it by 80%, we get Y = 49.7--X0 in Figure 2. It becomes a straight line.

Therefore, in preheating treatment-heated injection fluid processing, it is necessary to set the thermal contraction rate Y□□□ during processing with respect to the preheating temperature XCO within a range that satisfies the formula.

On the other hand, as is clear from Figure 1, the preheating temperature is 140°C.
If the temperature is less than 195°C, it is impossible to obtain a crimp rate of 10% or more, while if it exceeds 195°C, the yarns may fuse on the preheating plate or the preheating roller. Easy and undesirable.

Therefore, the yarn preheating temperature xCc) is 140℃≦X≦19
It is necessary to set a range of 5°C.

That is, the present invention performs yarn preheating and heated injection fluid processing by adjusting the yarn preheating temperature
This is done within the shaded area in the figure.

As described above, according to the present invention, the crimped yarn has excellent bulkiness of 10 mm or more, and the dyeability is substantially uniform even if there are slight variations in processing conditions due to process variations, etc. It is possible to stably produce uniform crimped yarns that do not cause myositis when made into carpets.

The present invention will be explained below with reference to Examples.

Example nylon 6 filament yarn 2100de/136fil
using a device as shown in Japanese Patent Publication No. 47-40113, and a fluid injection nozzle as shown in Japanese Patent Publication No. 40-13021.
The crimping process was carried out using a structure similar to that shown in the publication.

The processing conditions and the results obtained are shown in Table 1.

The processing conditions were such that the thermal contraction during processing was varied depending on the temperature of the heated injection fluid for each preheating temperature.

Processing conditions and results are shown in Table 1.

As is clear from this example, Examples AC and H are processing conditions where the crimp ratio is almost at its maximum value, but on the lower heat shrinkage side (the crimp ratio also decreases at the same time), the crimp ratio is higher than this. It can be seen that the effect of heat shrinkage on the degree of dyeing of tufted carpet is smaller than that of the side.

When the crimped yarn produced by the production method of the present invention was tufted, the tufting properties were good, and the resulting carpet had good carpet properties such as covering, and a good carpet with almost no myositis caused by dyeing spots. Obtained.

However, if the preheating temperature of the yarn is too low, there will be insufficient thermal energy to impart bulkiness, that is, crimp, and the target crimp rate of 10 will not be achieved especially if the preheating treatment is performed at a temperature lower than 140°C.
It is difficult to obtain more than 100%.

On the other hand, if the preheating temperature is increased, as a matter of course, a problem of fusion of yarns occurs, and the maximum temperature is approximately 195° C., and if the temperature is higher than this, the operability will be significantly reduced.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the relationship between the heat shrinkage rate during processing and the crimped yarn of the obtained crimped yarn in heated jet fluid processing, and Figure 2 is a diagram showing the relationship between the heat shrinkage rate during processing and the crimped yarn used in the present invention. It is a diagram showing the range of the preheating temperature, and the shaded area is the range adopted in the present invention.

Claims (1)

[Claims] 1 filament yarn made of thermoplastic synthetic fiber, 2
at least three times into a heated injection fluid treatment nozzle having a temperature above the second transition temperature of the filament;
In a method of manufacturing a crimped yarn by supplying the filament in an overfeed state of 0% or more and applying a heated fluid injection process using the nozzle to bend or entangle each filament with each other to form a loop or a walnut, Thermal shrinkage rate (increase rate of denier) during heated fluid jetting processing versus Y (@toji, yarn preheating temperature XCC when supplied to the heated jetting fluid processing nozzle is X←Q) A method for producing a crimped yarn without myositis, characterized in that preheating treatment and heated jet fluid treatment are carried out within a range where the thermal contraction rate Y (%) during processing is within the following general formula.