JP3232926B2 - Method and apparatus for squeezing crimped acrylic fiber tow - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for squeezing crimped acrylic fiber tow, and more particularly, to obtain a stable and low moisture content after squeezing and simultaneously dipping the tow. The present invention relates to a method and a device for squeezing a crimped acrylic fiber tow capable of stably controlling the liquid level of a bathtub to be used.

[0002]

2. Description of the Related Art Acrylic fiber tow passes through a spinning process and is crimped to increase bulkiness of a final product. Such crimping is performed by immersing the acrylic fiber tow in hot water at 70 to 90 ° C. or by spraying steam on the acrylic fiber tow to give appropriate heat and moisture, and nip it with two metal rollers circumscribing the rectangular tow. It is applied by pushing into a stuffing box in the shape of a buckle and buckling without damaging the fibers. The crimped acrylic fiber tow is first heat set in a steamer in saturated steam at 110 to 140 ° C., and then passes through a squeezing step through a water washing step and / or a spinning oil agent applying step, Dried to the final product.

[0003] In the drawing step of the crimped acrylic fiber tow, the applied crimp is maintained at a value within the quality standard when it becomes a final product, and at the same time, the moisture content is stabilized in a state as low as possible. When squeezing by dipping in an oil agent, it is desirable to suppress the fluctuation of the adhesion rate of the oil agent and at the same time to reduce the drying cost. As a result, the fluctuation range of the liquid level in the bathtub is reduced, and the operation can be performed with the liquid level being stabilized.

[0004] As a process of drawing the acrylic fiber tow, for example, a method of drawing in one step (see FIGS. 1A and 1B) and a method of drawing in two steps (see FIGS. 2A and 2B) have been used. Has been adopted. However, in the method of squeezing in one step, even if an attempt is made to increase the load of the upper pressing roller in order to sufficiently lower the moisture content of the crimped tow, the reduction of the moisture content is not limited, There has been a problem that damage to the single yarn of the tow occurs, and facility failures such as peeling of the roller rubber and cracking of the welded portion of the roller occur. In addition, the method of squeezing in two steps can slightly lower the moisture content than the method of squeezing in one step, but increase the load of the upper press roller as long as damage to the toe does not occur, or change the shape of the roller on the press side Even if the measures were taken, the moisture content could not be stabilized at a low state.

Further, in any of the tow squeezing methods conventionally used, the liquid temperature in the bath tub in which the tow is immersed before the squeezing step is not controlled at all, so that the liquid temperature in the bath tub is changed from the start of production to the tow. However, there is a problem that the moisture content after squeezing changes before the temperature is equilibrated, and when the oil agent is applied, the adhesion rate of the oil agent changes.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to obtain a stable water content after squeezing. It is an object of the present invention to provide a method and an apparatus for squeezing crimped acrylic fiber tow capable of stably controlling the liquid level of a bathtub into which the tow is immersed.

[0007]

Means for Solving the Problems In order to achieve the above object, the present inventors have intensively studied a method and an apparatus for squeezing a crimped acrylic fiber tow by a squeezing roller arranged in two stages. The present invention has been completed.

[0008] That is, the drawing method of the present invention is a method in which a crimped acrylic fiber tow is immersed in a liquid in a bath tub, taken out, and squeezed by a drawing roller arranged in two stages in the tow traveling direction. The tension ratio between the squeezing rollers is set to be larger than 1.00 and equal to or smaller than 1.10.

Further, according to the drawing method of the present invention, water is applied to the crimped acrylic fiber tow, and the tow is drawn by a drawing roller arranged in two stages in the tow traveling direction (first drawing step). This fiber tow is immersed in a bath filled with an oil agent and then taken out.
In the method of squeezing the tow with the squeezing rollers arranged in stages (second squeezing step), the tension ratio between the respective squeezing rollers in the first squeezing step and the second squeezing step is set to be larger than 1.00 and equal to or less than 1.10. It is characterized by the following.

The drawing apparatus of the present invention further comprises a bathtub for immersing the crimped acrylic fiber tow, a drawing roller arranged in two stages for squeezing the fiber tow, And a device for dipping and then running to squeeze with the squeezing roller, wherein the tension ratio between the squeezing rollers is greater than 1.00 and 1.10. It is characterized in that a means that can be controlled in the following range is provided.

[0011] The drawing device of the present invention further comprises means for applying moisture to the crimped acrylic fiber tow, and a drawing roller arranged in two stages for squeezing the water-applied fiber tow. An oil bath for immersing the fiber tow, a squeezing roller arranged in two stages for squeezing the immersed and taken-out fiber tow, and imparting moisture to the fiber tow, squeezing with the squeezing roller, and then Means for immersing and removing the fiber tow in the oil bath, and a means for running the fiber tow so as to squeeze it with the squeezing roller, wherein the tension ratio between the squeezing rollers is 1 It is characterized in that a means capable of controlling in a range of greater than .00 and less than or equal to 1.10 is provided.

Here, the tension ratio between the squeezing rollers is defined as follows: tension ratio = (second stage squeezing roller speed) / (first stage squeezing roller speed)

In the present invention, the tension ratio between the squeezing rollers arranged in two stages is larger than 1.00 as described above.
It is controlled so as to be in the range of 10 or less. When the tension ratio is not controlled at all (strain ratio = 1.00), the decrease in moisture content after drawing is small, while when the tension ratio is greater than 1.10, the moisture content can be reduced, but the given crimp is stretched. This is because there is a possibility that the quality standard may be deviated. The optimum value of the tension ratio in the present invention is 1.04 in consideration of the water content after squeezing, the de-crimping rate, and the like.

In the present invention, the temperature of the liquid in the bathtub is further reduced by 50%.
It is preferable to control the temperature to not more than ° C. If the liquid temperature exceeds 50 ° C., the product may be out of the quality standard. For example, when the tension ratio between the squeezing rollers is 1.04,
The optimal temperature of the liquid in the bathtub is 35 ° C. If the liquid temperature in the bathtub is higher than this, the crimp applied will be stretched,
If it is lower than this, the decrease in the water content after drawing tends to be small. Therefore, the liquid temperature in the bathtub is the tension ratio,
It is preferable that an optimum value is appropriately set in the range of 50 ° C. or less in consideration of the moisture content after squeezing, the de-crimping rate, and the like.

[0015]

When the crimped acrylic fiber tow is applied to the apparatus constructed as described above and squeezed, the tension ratio between the squeezing rollers arranged in two stages is controlled to a value larger than 1.00. Therefore, even if there is a crimp, the single yarn is stretched, the gap between the single yarns is reduced, and the liquid easily flows from the inside of the tow to the outside when squeezed. As a result, a reduction in the moisture content can be achieved without increasing the load on the upper squeezing roller. In addition, since the tension ratio between the squeezing rollers is controlled at a value of 1.10 or less, there is no fear that the crimp applied to the roller is excessively stretched and the value within the quality standard cannot be maintained.

Further, as described above, the temperature of the liquid in the bath immersed for applying water or oil for spinning is controlled to a constant value of 50 ° C. or less, so that the crimp is stretched due to the high temperature. Since the temperature in the bathtub can be set almost in equilibrium with the temperature of the tow during the line running from the start of production without deviating from the quality standard, the fluctuation of the moisture content after the squeezing is small.

[0017]

EXAMPLES The method for squeezing crimped acrylic fiber tow of the present invention and an apparatus therefor will be described with reference to the following examples, but the present invention is not limited thereto.

FIG. 3 shows an embodiment of the aperture device according to the present invention. In the apparatus shown in FIG. 3, the crimped acrylic fiber tow 1 is immersed in the liquid in the bath tub through rollers 2 and 3a, taken out of the liquid in the bath tub through rollers 3b, and then squeezed at the first stage. 4a, 4b and the second-stage squeezing rollers 5a, 5b sequentially move the tow.
The driving is performed by driving the second-stage driving aperture roller 5b.

The method of immersing the tow in the liquid in the bathtub is not only performed by the two rollers 3a and 3b as described above, but also by the method of immersing the tow in the liquid in the bathtub by one roller 3c as shown by a broken line in FIG. Can also be employed. The liquid in the bath tub is generally water for washing or oil for spinning, but the liquid level is sufficient if the liquid is immersed in the entire tow surface, and is usually at a position slightly lower than the center of the rollers 3a, 3b (for example,
Position).

In the present invention, the temperature of the liquid in the bathtub is preferably controlled to a constant value of 50 ° C. or less. As a method for this, for example, a tube type heat exchange device installed inside the bathtub or provided outside the bathtub is used. A method is employed in which the temperature of the liquid supplied to the bathtub is controlled to be constant by using a heat exchanger. However, in this case, it is necessary to enable both heating and cooling control.

In the apparatus shown in FIG.
The upper rollers 4a and 5a of the upper-stage squeezing roller move up and down, respectively, and apply a load to the lower rollers 4b and 5b to squeeze the tow. The liquid squeezed by the squeezing rollers 5a and 5b falls down and returns to the bathtub 6.

The tension ratio between the first-stage drawing rollers 4a and 4b and the second-stage drawing rollers 5a and 5b is 1.00 in the present invention.
The range is controlled to be larger than 1.10, but the method shown in FIGS. 5A and 5B can be adopted as the method. According to the method of FIG. 5A, the first-stage drive aperture roller is driven by one motor, the driving force is transmitted to the second-stage drive aperture roller by a shaft and a gear box, and the gear ratio is appropriately changed to change the first-stage drive aperture roller. The desired tension ratio can be obtained by adjusting the speed of the eye and second stage drive squeeze rollers. In this case, adjustment of the speed between the squeezing rollers can be achieved by using a stepless speed change function provided in the gear box.

According to the method shown in FIG. 5 (b), a motor is attached to each of the first-stage drive aperture roller and the second-stage drive aperture roller, and the first-stage drive aperture roller is driven by an inverter attached to each motor. The desired tension ratio can be obtained by adjusting the speed of the second-stage drawing roller.

In the present invention, as long as the tow can be squeezed by the two-stage squeezing roller, the shape, size and arrangement of the squeezing roller are not limited. For example, in addition to the two-stage squeezing roller arrangement shown in FIG. The equipment forms (a), (b), and (c) can also be adopted. The device shown in FIG. 4A is obtained by changing the upper draw roller of the first stage to two small rollers in the device shown in FIG. 3, and this small roller moves up and down to apply a load to the lower roller to tow. Is squeezed. The apparatus shown in FIGS. 4B and 4C is obtained by interposing one roller between the first-stage and second-stage drawing rollers in the apparatus shown in FIGS. 3 and 4A. The interposed roller may or may not be driven, but when driven, it is necessary to make it equal to the speed of the second-stage squeezing roller.

Next, another embodiment of the present invention is shown in FIG.
(B). In the apparatus shown in FIGS. 6A and 6B, the crimped tow is first hydrated and squeezed in the first squeezing step, then the tow is immersed in an oil bath and taken out, and then the second squeezed. The squeezing is performed again in the process, and in each squeezing process, the tension ratio between the squeezing rollers is controlled in a range from more than 1.00 to 1.10. The main difference between the devices of FIGS. 6A and 6B is the process of applying moisture to the toe in the first half, and the method of applying moisture is as shown in FIG. 6A by immersion in the liquid in the bathtub. In b), the spraying is performed. In these apparatuses, it is preferable that the liquid temperature in the bath is controlled to a constant value of 50 ° C. or less for the same reason as described above.

Test Example A crimped acrylic fiber tow was applied to the drawing apparatus of the present invention shown in FIG. 3 and the tension ratio and the bath temperature were changed as shown in Table 2 to obtain the following. Under the test conditions, the water content after squeezing, the change in the water content, the rate of de-crimping, and the fluctuation range of the liquid level in the bathtub were measured. It should be noted that, for comparison with the apparatus of the present invention, a one-stage aperture apparatus as a conventional example (FIG. 1A)
A two-stage squeezing device (FIG. 2A) was also tested under the same conditions as the device of the present invention without controlling the tension ratio and the bath temperature.

Test conditions Pressing load per 1 cm toe width: 100 kg / c
m Running speed of tow: 100 m / min Acrylic fiber tow: Single yarn fineness 5 denier, total denier 1.5 million Liquid in bathtub: water Room temperature: 20 ° C

The methods of measuring the moisture content, the rate of de-crimping, and the fluctuation range of the liquid level in this test example are as follows: Measurement method / moisture content (X), variation in moisture content (R) Cut to a suitable length with a scissor, sample and measure the tow weight (W1). Next, the tow is put into a drier to evaporate the liquid adhering to the tow, and the tow weight (W2) in an absolutely dry state (water content: 0%) is measured. These measurements are performed five times under the same conditions, and the values of the water content (X) after squeezing and the variation (R) of the water content are calculated by the following formulas.

De-crimping ratio The crimped tow sampled by cutting the tow at the inlet of the drawing process and the outlet of the drawing process with scissors is sampled, and the heat history received by the tow when it is originally dried online is reproduced as it is. The crimps are developed by drying off-line while allowing the towels to crimp, and the degree of crimp (α, β) (%) of each tow on a product basis is measured. Then, the value of the de-crimp rate is calculated by the following formula. The initial crimping and setting conditions are set so that the de-crimping ratio deviates from the quality standard if it exceeds 20%, and if the de-crimping ratio is within 20%, the product is irrespective of the level. It is designed to fall within the range of the crimp standard.・ Fluctuation of liquid level fluctuation In the value continuously displayed by the liquid level detecting device attached to the bathtub where the tow is immersed, the maximum (%) and minimum (%) of the liquid level shown within 8 hours The difference is defined as the liquid level fluctuation range (%).

Tables 1 and 2 show the measurement results of the water content after squeezing, the fluctuation of the water content, the de-crimping rate, and the fluctuation range of the liquid level in the bathtub in the conventional apparatus and the apparatus of the present invention.

[0031]

[Table 1]

[0032]

[Table 2]

As can be seen from Table 1, the conventional one-stage squeezing apparatus has a high water content and a wide range of liquid level fluctuations, and particularly the liquid level fluctuations are large, so that the liquid in the bathtub sometimes overflows. In the conventional two-stage restrictor, the water content and the liquid level fluctuation range were slightly lower than those of the one-stage restrictor, but were not satisfactory. As can be seen from Table 2, in the apparatus of the present invention, the water content, the fluctuation of the water content, and the fluctuation range of the liquid level are all significantly reduced with respect to these conventional examples. , The de-crimp rate was sufficiently within the range of the quality standard.

[0034]

According to the present invention, since the tow is squeezed in a tension ratio of more than 1.00 and not more than 1.10, the applied crimp is not excessively stretched, and the water content of the tow after squeezing is reduced. As a result, the cost for drying the tow after squeezing can be reduced, and the fluctuation range of the liquid level in the bathtub in which the tow is immersed can be reduced. When the bath is filled with the oil, and the squeezing is performed after the crimped tow is immersed, a stable moisture content is obtained as described above, so that the variation in the oil agent adhesion rate can be reduced and the effect of improving the quality can be improved. can get. In the present invention, the liquid temperature in the bathtub in which the tow is immersed can be controlled at a constant value of 50 ° C. or less.
The de-crimp rate does not deviate from the quality standard, and the fluctuation of the moisture content until the temperature of the liquid in the bath is substantially equilibrated with the temperature of the tow can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a conventional one-stage stop device.

FIG. 2 is a diagram showing a conventional two-stage aperture device.

FIG. 3 is a diagram showing one embodiment of a diaphragm device of the present invention.

FIG. 4 is a diagram showing an example of an arrangement form of an aperture roller in the aperture device of the present invention.

FIG. 5 is a diagram showing a method for controlling a tension ratio in the diaphragm device of the present invention.

FIG. 6 is a view showing one embodiment of a diaphragm device of the present invention.

[Explanation of symbols]

 1 toe 2 roller 3a, 3b, 3c roller 4a first-stage squeezing roller 4b first-stage squeezing roller 5a second-stage squeezing roller 5b second-stage squeezing roller 6 bathtub 7 liquid level

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-104876 (JP, A) JP-B-46-15135 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06B 15/12 D06B 15/02

Claims (6)

(57) [Claims] 1. A method in which a crimped acrylic fiber tow is immersed in a liquid in a bath tub and then taken out, and the tow is squeezed by a squeezing roller arranged in two stages in the tow advancing direction. A method for squeezing crimped acrylic fiber tow, wherein the tension ratio is greater than 1.00 and less than or equal to 1.10. 2. A crimped acrylic fiber tow is moisturized, and the tow is squeezed by a squeezing roller arranged in two stages with respect to the tow traveling direction (first squeezing step). In a method of squeezing the tow with a squeezing roller arranged in two stages in the tow advancing direction (second squeezing step),
A method for squeezing crimped acrylic fiber tow, wherein the tension ratio between the respective squeezing rollers in the first squeezing step and the second squeezing step is set to be larger than 1.00 and equal to or smaller than 1.10. 3. The squeezing method according to claim 1, wherein the temperature of the liquid in the bath is set to a constant value of 50 ° C. or less. 4. A bath for immersing the crimped acrylic fiber tow, a squeezing roller arranged in two stages for squeezing the fiber tow, and immersing the fiber tow in the bath and then taking out the fiber tow. A crimped acrylic fiber tow squeezing device including means for running to squeeze with a squeezing roller, wherein the tension ratio between the squeezing rollers can be controlled in a range of more than 1.00 and not more than 1.10. Means for squeezing an acrylic fiber tow provided with crimps, characterized by comprising means. 5. A means for applying moisture to the crimped acrylic fiber tow, a squeezing roller arranged in two stages for squeezing the moisture-applied fiber tow, and immersing the fiber tow. An oil bath for squeezing, a squeezing roller arranged in two stages for squeezing the immersed and taken out fiber tow, applying moisture to the fiber tow, squeezing with the squeezing roller, and then removing the fiber tow from the oil tub And a means for squeezing out the squeezed acrylic fiber tow and a means for running the squeezed acrylic fiber tow with the squeezing roller, wherein the tension ratio between the squeezing rollers is greater than 1.00. A crimped acrylic fiber tow squeezing device, comprising means capable of being controlled in a range of 10 or less. 6. The squeezing device for crimped acrylic fiber tow according to claim 4, further comprising means for controlling the liquid temperature in the bath at a constant value of 50 ° C. or less.