JPS6342019B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for applying a liquid in the bulking process of thermoplastic synthetic fibers, and more specifically, in the bulking process of thermoplastic synthetic fibers, a rotating roller whose lower part is immersed in a liquid is used to apply a yarn. The present invention relates to a method for uniformly applying a large amount of liquid by contacting the roller with the running direction of the roller inclined at an arbitrary angle from the perpendicular direction to the rotation axis of the roller. Conventionally, there is a method of applying liquid to the yarn by bringing the running yarn into contact with the surface of a rotating roller whose lower part is immersed in liquid or the surface of a second roller that rotates in contact with a rotating roller whose lower part is immersed in liquid (hereinafter referred to as The roller method has the advantages of simple equipment, easy simultaneous control of multiple spindles, and relatively few spots between and within the spindles, including spots over time. Therefore, it is widely used, especially for supplying spinning oil during spinning in the fiber manufacturing process, or for adding a smoothing agent, a sizing agent, etc. during yarn winding in the weaving, knitting and weaving preparation process. However, in this field, the amount of liquid that adheres to the yarn is less than a few percent by weight, and it is difficult to uniformly apply a small amount of liquid, especially when supplying spinning oil during spinning. Since this is an important issue, it is necessary to dilute the liquid, increase the diameter of the rotating roller, and maintain the direction of the running yarn perpendicular to the rotation axis of the rotating roller and refine the control of the weld length. The emphasis was on Furthermore, when applying liquid discontinuously in the longitudinal direction of the yarn, even if the yarn is brought into contact with a rotating roller, it is difficult to wet the yarn, resulting in mistakes in adhesion.
There was a problem that the liquid could not be attached to a predetermined location. That is, in the conventional roller method, as shown in FIG. In this case, the yarn Y passes through the entrance guide 3' in a plane perpendicular to the rotation axis 2-2 of the rotating roller 1, and moves from the contact start point (A)' to the contact end point (B)' with the rotating roller 1. during which the liquid is deposited and reaches the outlet guide 4'. In this case, the weld length of the yarn Y on the rotating roller 1 is as follows: the radius of the rotating roller 1 is R, the center of the rotating roller 1 is (O), the contact start point (A)', and the center of the rotating roller 1 (O). If the central angle ∠A′OB′ _formed by
and θ′ ₁ . Generally, the speed of the running yarn Y is significantly higher than the surface speed of the rotating roller 1, so the situation in which the liquid L adheres to the yarn Y in FIG. Regardless of whether the rotating direction of roller 1 is forward or reverse, the yarn Y wipes off the liquid L adhering to the surface of the rotating roller 1. Therefore, the liquid L adhering to the surface of the rotating roller 1 is instantly wiped off by the yarn Y at the contact start point (A)' with the yarn Y. Furthermore, the replenishment of the liquid L to the rotating roller 1 is related only to the amount of liquid movement corresponding to the welding width of the surface of the roller 1 due to the rotation of the roller 1, that is, the number of rotations of the roller 1. However, in reality, the yarn Y
Since the amount of liquid L that can be applied to the surface increases, the liquid L adhering to the surface of the rotating roller 1 is not only wiped off at the contact start point (A)', but also the liquid L is wiped off. There is also an effect that the liquid L near the weft moves to the weft over the entire length of the weft, and these liquids are also attached to the yarn Y. However, in this case, the contact width of the spliced part is about the diameter of the yarn Y, that is, usually about 1 mm at most, and the spliced length is usually about 10 mm at most. The maximum speed is about 100rpm as long as the problem of scattering does not occur. Under such liquid application conditions, there is a limit to the amount of liquid L that can be applied to the yarn Y, and the amount of liquid L that can be applied to the yarn Y is at most a few percent by weight.
It was moderately hot. The present inventors have proposed a method of imparting special physical properties to a bulky yarn made of thermoplastic fiber by applying a few percent to more than ten percent of liquid and then heat-treating the yarn. No. 55-73626), but in this method, the amount of liquid applied was insufficient in the conventional roller method described above, and the desired effect could not be obtained. On the other hand, various studies have been conducted on alternative methods such as bringing the running yarn into contact with the tip of the nozzle from which the liquid flows out, but this method would be complicated in terms of equipment, and if the running tension of the yarn was low, it would be difficult to apply the liquid. There were problems such as instability, and similarly, the desired effect could not be obtained. In view of this situation, the present inventors have intensively studied a liquid application method that has the advantages of the roller method and can increase the amount of liquid applied, and as a result, has arrived at the present invention. That is, in the present invention, the thread is intermittently brought into contact with the surface of a rotating roller whose lower part is immersed in a liquid, and the thread is processed in the longitudinal direction of the thermoplastic fiber before or after the bulking process of the thermoplastic fiber. A method of intermittently applying a liquid to and continuously heat-treating,
This method is characterized in that the running direction of the yarn is inclined at an arbitrary angle from the direction perpendicular to the rotation axis of the rotating roller, and the yarn is brought into intermittently contact with the surface of the rotating roller. The method of the present invention will be explained in more detail below with reference to the accompanying drawings. FIG. 2 is a schematic diagram showing an example of the method of the present invention when a yarn is brought into contact with a rotating roller.
is a plane that is inclined by an angle θ ₂ (hereinafter referred to as contact angle) from the plane perpendicular to the rotating shaft 2-2 of the rotating roller 1 whose lower part is immersed in the liquid L after passing through the inlet guide 3 as in FIG. The rotating roller 1 contacts between the contact start point (A) and the contact completion point (B) within the roller 1, and the liquid is applied while passing between these points, and the exit guide 4
reach. In this case, the welding length (A), (B) ⌒ of the yarn Y on the rotating roller 1 is the central angle formed by the contact starting point (A), the center of the rotating roller (O), and the contact completion point (B). ∠AOB
is θ ₁ , in the case of the conventional roller method, the radius R of the rotating roller 1, which also takes into account the contact angle θ ₂ , is
It is determined by the central angle θ ₁ and the contact angle θ ₂ . Therefore, in FIG. 2, with the same roller diameter as the rotating roller in FIG. 1, the distance between the contact start point (A) and the contact end point (B) in the direction perpendicular to the rotation axis of the rotating roller 1 is Even though they are the same as those in Figure 1, the tangent lengths (A), (B)⌒ in Figure 2 are longer than the tangent lengths (A)', (B)'⌒ in Figure 1. . Moreover, according to the method of the present invention, the amount of liquid adhering to the yarn is greater than when the conventional roller method simply increases the length of the yarn and makes the length equal to the length of the yarn of the method of the present invention. can be significantly increased. This is because, in the conventional roller method, the distance in the width direction of the roller surface that the yarn comes into contact with is equivalent to the diameter of the yarn, but in the method of the present invention, the distance in the width direction of the roller surface is equivalent to the diameter of the yarn. The length corresponds to the welding length (A), (B)⌒×sinθ _2. Therefore, in the case of the method of the present invention, the length to wipe the amount of liquid held on the rotating roller 3 becomes large. It is from. Normally, the length of the suction thread (A), (B)⌒ is at least 10 times the diameter of the yarn, and by making sure that sinθ ₂ > 1/10, that is, the contact angle θ ₂ is 6° or more. Therefore, the effects of the method of the present invention can be expected. In addition, the above contact angle θ ₂ is in the range of 90° or less, and the larger θ ₂ is, the larger simθ ₂ is. However, from an actual operational perspective, it is important to reduce the pitch between spindles and to improve the running yarn, especially bulky yarn. In view of obstacles caused by bending frictional resistance, the contact angle θ ₂ is preferably in the range of 10° to 45°. Of course, it goes without saying that the contact angle θ ₂ can be adjusted as appropriate depending on the type of thermoplastic synthetic fiber, the bulking process, etc. As mentioned above, the liquid application method of the present invention may be performed after the bulking process together with the subsequent heat treatment, or may be performed before the bulking process, and in either case, the liquid application method of the present invention may be performed continuously with the bulking process. It can be implemented. In this way, the method of the present invention
By operating the inlet guide 3 in front of the rotating roller 1 so that the yarn comes into contact with the rotating roller 1 intermittently, liquid is applied to the yarn intermittently.
The liquid can be reliably applied to the designated location. The thermoplastic synthetic fibers in the method of the present invention are synthetic fibers made of polymers such as polyester and polyamide, copolymers thereof, blend polymers, etc., and the bulking process for these thermoplastic synthetic fibers includes false twisting. This includes a bulking process using a method, a drawing false-twisting method, a fluid treatment method, or a rubbing method, or a bulking process that makes latent crimped yarns visible. Examples of the liquid used in the method of the present invention include water and solutions of swelling agents, dyes, pigments, oils, and the like. As described above, in the liquid applying method of the present invention, the running direction of the yarn is inclined at an arbitrary angle from the perpendicular direction to the rotation axis of the rotating roller, and the yarn is brought into intermittent contact with the roller surface. Therefore, in the bulking process of thermoplastic synthetic fibers, even if the optimum speed for bulking and the optimum speed for applying liquid are different, it is possible to apply the required amount of liquid by appropriately selecting the inclination angle. This not only eliminates the need to perform the bulking process and the liquid application process separately, but also eliminates the need to increase the number of rotations of the rollers. Therefore, when using a liquid with low viscosity such as water, Also, a large amount of liquid of more than ten percent can be applied without causing problems such as liquid scattering. Furthermore, according to the method of the present invention, it is possible to increase the amount of liquid applied using conventionally used rollers, so there is no need for large diameter rollers or complicated equipment, and there is no need for installing these equipment. There are also advantages such as not requiring a large space or work space, and the liquid application method of the present invention is highly practical. Furthermore, since a large amount of liquid can be applied to the yarn, special physical properties can be imparted to the yarn through subsequent heat treatment. The present invention will be specifically explained below using examples. Example Using polyester filament 75d/36f, a liquid application device was installed at the inlet of the reheat treatment section of a Mitsubishi Heavy Industries LS-2 type false twisting machine, and the material was false-twisted under the conditions shown in Tables 1 and 2 to increase bulk. The yarn was made into a yarn, water was applied thereto, heat treatment was performed, and the properties of the resulting specially processed yarn were investigated, and the results shown in Table 3 were obtained. In addition, in Tables 2 and 3, samples Nos. 1 and 2 are comparative examples in which water is applied intermittently with the direction of the running yarn perpendicular to the rotation axis of the rotating roller, and sample No. .3
-5 is the liquid application method of the present invention, that is, the running direction of the yarn is made to be more inclined than the perpendicular direction with respect to the rotation axis of the roller, and water is applied intermittently by changing the contact angle to 30°, 45°, and 60°. An example of the present invention is shown below.

【table】

【table】

[Table] (Note) ○ mark: Good × mark: Slightly poor △: Poor The bulkiness of each specially processed yarn obtained in the above manner was greatly reduced in the part to which no water was added, and the bulkiness in the longitudinal direction Comparative example No. 1 had a processed yarn with thick details in appearance, but the water application method was the conventional method.
Samples No. 3 and No. 2 had a small amount of water adhesion, and the effect was incomplete and insufficient, whereas samples No. 3 to No. 5 obtained by the application method of the present invention had a large amount of water adhesion and were uniform. The properties were also good and a fully satisfactory effect was obtained. In other words, in sample No. 1 to which water was applied using the conventional method, water was not applied to the threads sufficiently, and the bulky parts of the resulting processed yarn lacked uniformity in the longitudinal direction, and were almost as large as the parts to which no water was applied. However, the bulkiness was extremely low, and it was not possible to obtain the desired length and composition ratio of the bulky part and non-bulky part. In addition, we used the conventional method to increase the number of rotations of the roller and also made the welding length as long as possible.
In No. 2, water was still not applied sufficiently, and although the bulkiness remaining in the water-applied area was slightly better than that of sample No. 1, the drawback that the bulky part disappeared midway was not improved. Ta. Samples in which the contact angle was set to 30° using the method of the present invention for sample No. 1 and sample No. 2 of the comparative example.
In No. 3, water is sufficiently applied to the yarn, and the resulting processed yarn is uniform over the entire length without the bulky part disappearing in the middle, and the bulky part is compared to the non-bulky part. It was highly bulky, and the effect of thickening and thinning on the appearance was well recognized. Additionally, the length of the bulky part and the length of the non-bulky part were also within the target composition ratio. In the application method of the present invention, in sample No. 4 where the contact angle was 45°, the amount of water applied was further increased compared to sample No. 3, and the appearance of the obtained processed yarn was similar to that of sample No. 4.
However, during processing, the surfaces of the delivery roller and winding roller of the processing machine became slightly wet, and the resulting processed yarn package was also slightly wet. In addition, in the method of the present invention, sample No. 5, in which the contact angle was 60°, had the largest amount of water adhering to the yarn, and the appearance of the obtained processed yarn was the same as sample No. 3, but The wetting of the machine's delivery roller, winding roller, and package cage was even more significant than in sample No. 4, and because the amount of water adhering to the yarn was large, the running yarn became slack, causing fluctuations in the bond length on the roller surface. Ta. In this case, since the guides of adjacent weights are close to each other, there is little space, and it is difficult to thread the thread during the thread threading operation.

[Brief explanation of drawings]

1A and 1B are schematic views showing an example of the conventional liquid application method, and FIGS. 2A and 2B are schematic views showing an example of the liquid application method of the present invention. 1... Rotating roller, 2... Rotating shaft, 3... Entrance guide, 4... Outlet guide, Y... Yarn, L... Liquid.

Claims (1)

[Scope of Claims] 1 Continuing with the bulking process of thermoplastic fibers, before or after the bulking process, the running yarn is intermittently brought into contact with the surface of a rotating roller whose lower part is immersed in a liquid. A method in which a liquid is applied intermittently in the longitudinal direction of the yarn, followed by heat treatment, and the running direction of the yarn is tilted at an arbitrary angle from the perpendicular direction to the rotation axis of the rotating roller. A method for applying a liquid in a bulking process characterized by intermittent contact with a surface. 2. A method for applying liquid in a bulking process according to claim 1, wherein the running direction of the yarn is inclined at an angle of 10° to 45° with respect to a direction perpendicular to the rotation axis of a rotating roller.