JP2002249283A - Impregnation method for knitting yarn, impregnation device for knitting yarn, and knitting yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impregnation method for knitting yarn, impregnation device for knitting yarn and knitting yarn capable of uniformly impregnating a knitting yarn with an impregnating solution. SOLUTION: The knitting yarn 2 is introduced at a prescribed speed between the recessed groove 4a of a drive roll 4 rotated at a prescribed speed in the state where it is partially dipped in the impregnating solution A to be impregnated in the knitting yarn 2 and a driven roll 5 provided above the drive roll 4, and the impregnating solution A adhered to the drive roll 4 is impregnated in the knitting yarn 2 while pressing the knitting yarn 2 by the driven roll 5. Accordingly, the knitting yarn 2 can be uniformly impregnated with the impregnating solution A, and the quality can be improved and stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for impregnating a knitting yarn for impregnating a knitting yarn for a gland packing with an impregnating liquid, an impregnation device, and a knitting yarn.

[0002]

2. Description of the Related Art For example, a carbon fiber knitting yarn for a gland packing used in a shaft sealing portion of various devices such as a pump, a stirrer, a valve, etc. A knitting yarn obtained by impregnating a filling agent such as Teflon (registered trademark) into a knitting yarn made of The conventional step of impregnating the filler will be briefly described with reference to FIG. As shown in FIG. 7, a knitting yarn 22 made of carbon fiber or the like is drawn out of the yarn reel 21 and dipped for several seconds in an impregnating liquid tank 23 filled with a filler, and then the upper roll 24a and the lower roll 24b Is introduced between the pressing surfaces of the squeezing roll 24 composed of a pair of. After the plugging agent extraly attached to the knitting yarn 22 is scraped off by the squeezing roll 24, the knitting yarn 22 is introduced into a drying furnace 25 and dried. Thereafter, it is wound up by a take-up reel 27 via a guide roller 26.

[0003]

However, in the above-mentioned conventional impregnation method, the filler removed by the squeezing roll 24 is dried and solidified, and gradually accumulates on the pressing surface of the squeezing roll 24, The distance between the upper roll 24a and the lower roll 24b of the squeezing roll 24 is increased.
For this reason, the effect of removing the plugging agent excessively attached to the knitting yarn 22 by the squeezing roll 24 gradually decreases, and the impregnation rate of the knitting yarn 22 with the plugging agent varies. At this time, if the impregnation rate is too high, the packing will flow and the stress will protrude from the gap, and if the impregnation rate is too low, the sliding resistance reduction effect will not be sufficient. In addition, since the plugging agent cannot be finally removed, an operation for removing the accumulation of the squeezing roll 24 is required. Moreover, since the knitting yarn 22 is pressed down by the squeezing roll 24, there is also a problem that the knitting yarn 22 is cut off when a projection such as a knot of the knitting yarn 22 passes. Further, a part of the plugging agent removed by the squeezing roll 24 returns to the original impregnating liquid tank 23. However, since the deposits adhering to the squeezing roll 24 need to be treated as waste, waste of resources is wasted. And processing costs were high.
The present invention has been proposed in view of the above circumstances,
An object of the present invention is to provide a method for impregnating a knitting yarn, a knitting yarn impregnating device, and a knitting yarn capable of uniformly impregnating a knitting yarn with an impregnation liquid.

[0004]

The present invention employs the following means to achieve the above object. That is, having a groove on the outer periphery, the groove of the drive roll that is driven to rotate while partially immersed in the impregnating liquid for impregnating the knitting yarn,
The knitting yarn is introduced at a predetermined speed between a driven roll provided above the driving roll, and the impregnating liquid attached to the driving roll is pressed by the driven roll while pressing the knitting yarn. Is adopted (claim 1).

More specifically, an impregnating liquid tank for containing an impregnating liquid for impregnating the knitting yarn, a driving roll which is driven to rotate while being partially immersed in the impregnating liquid, and has a concave groove on the outer periphery, An apparatus for impregnating a knitting yarn, comprising a driven roll that is provided above the roll so as to be able to move up and down and presses the knitting yarn introduced into the concave groove of the driving roll, and a tensioner that pulls the knitting yarn at a predetermined speed. (Claim 2).

In the present invention, a constant amount of the impregnating liquid can be always adhered to the groove of the driving roll by rotating the driving roll at a constant speed in a state of being partially immersed in the impregnating liquid. Since the knitting yarn is introduced between the driving roll and the driven roll to impregnate the knitting yarn with the impregnating liquid attached to the driving roll, a constant amount of the impregnating liquid is always uniformly impregnated into the knitting yarn. Can be. Further, it is preferable that the drive roll can be shifted (claim 3). In this case, the impregnation rate of the knitting yarn can be changed as necessary.

[0007]

FIG. 1 is a schematic view showing an embodiment of a knitting yarn impregnating apparatus according to the present invention, and FIG. 2 is a schematic view showing a driving roll and a driven roll used in the knitting yarn impregnating apparatus. It is sectional drawing. Hereinafter, the configuration of the knitting yarn impregnating device will be described with reference to the drawings. As shown in FIGS. 1 and 2, the knitting yarn impregnating device 1 mainly includes a raw yarn reel 3 for supplying a knitting yarn 2 made of carbon fiber as a raw material yarn to an upstream portion, and a knitting yarn 2.
Rollers 4 and 5 for impregnating the impregnating liquid A into the knitting yarn 2, the impregnating liquid tank 6 for storing the impregnating liquid A, and the knitting impregnated with the impregnating liquid A A drying furnace 7 for drying the yarn 2, a tensioning machine 8 for pulling the knitting yarn 2 at a constant speed, and a take-up reel 9 for winding the knitting yarn 2 are provided.

The drive roll 4 is provided above the impregnating liquid tank 6 so that only a part of the lower side is immersed in a state where a predetermined amount of the impregnating liquid A is stored in the impregnating liquid tank 6. I have. The drive roll 4 has a groove 4a formed along the outer periphery as shown in a cross section in FIG. 2 and a drive shaft 4b provided at the center. The drive shaft 4b is connected to a drive unit (not shown), and rotates the drive roll 4 at a predetermined speed. This drive unit has a speed change mechanism, and can change the number of rotations of the drive roll 4.

The driven roll 5 is provided above the drive roll 4, and is rotatable around a rotation shaft 5a provided at the center thereof. Further, the rotating shaft 5a is driven
Is vertically movably held by a frame (not shown) so that the frame can be moved up and down. Further, the driven roll 5 sandwiches the knitting yarn 2 introduced into the groove 4a of the drive roll 4 between the driven roller 5 and the bottom surface of the groove 4a, and the knitting yarn 2 is moved by its own weight.
Pressure.

A groove 4a formed in the drive roll 4
Is not limited to the shape in which the groove bottom is flat as shown in FIG. 2, for example, the shape in which the groove bottom is curved as shown in FIG. 4 (FIG. 4 (a)), and the groove bottom is tapered. For example, the shape may be narrow (FIG. 4B). Also,
Similarly, the shape of the driven roll 5 is not limited to the shape in which the outer peripheral surface is a flat surface as shown in FIG. 2, and for example, the shape in which the outer peripheral surface is a curved surface as shown in FIG.
(c)), the outer peripheral surface may be tapered and narrow (FIG. 4 (d)). Further, the combination of the driving roll 4 and the driven roll 5 of each shape can be appropriately selected. However, when the concave groove 4a is not formed on the outer periphery of the driving roll 4, the amount of the impregnating liquid A adhering to the driving roll 4 decreases. Further, although the present embodiment shows a case where each of the drive roll 4 and the driven roll 5 is one, a plurality of pairs of the drive roll 4 and the driven roll 5 are usually provided, and the plurality of knitting yarns 2 are simultaneously provided. Impregnation is performed.

Next, a process of impregnating the knitting yarn 2 with the impregnating liquid A using the knitting yarn impregnating device 1 will be described. The knitting yarn 2 supplied from the yarn reel 3 is introduced between the driving roll 4 and the driven roll 5 by the guide roller 10. Here, the knitting yarn 2 is moving at a constant speed by the pulling machine 8. On the other hand, the driving roll 4 rotates while being partially immersed in the impregnating liquid A. Even after the impregnating liquid A is detached from the impregnating liquid A, the impregnating liquid A is rotated by the surface tension as shown in FIG.
Is attached to the concave groove 4a. The knitting yarn 2 introduced into the concave groove 4a of the driving roll 4 in this state is pressed by the driven roll 5 and compressed. When the knitting yarn 2 is released from the pressing by the driven roll 5 and restores its original shape, it absorbs the impregnating liquid A attached to the concave groove 4a of the driving roll 4 as described above, and reaches the inside of the knitting yarn 2. The impregnating liquid A is impregnated. Here, when the driven roll 5 is not provided, the impregnating liquid A only adheres to the surface of the knitting yarn 2 and does not impregnate the inside of the knitting yarn 2. In addition, the peripheral speed of the drive roll 4 is usually set to be lower than the moving speed of the knitting yarn 2.

Next, the knitting yarn 2 impregnated with the impregnating liquid A is introduced into a drying furnace 7 and dried. Inside the drying furnace 7, it is wound around a plurality of rolls 7 a to secure a residence time inside the drying furnace 7. Thereafter, the knitting yarn 2 is taken up on a take-up reel 9 via a guide roller 11 and a pulling machine 8. Since the impregnation rate of the impregnating liquid A into the knitting yarn 2 is determined by the rotation speed of the driving roll 4 with respect to the moving speed of the knitting yarn 2, the rotation speed of the driving roll 4 is changed to change the relative speed with respect to the moving speed of the knitting yarn 2. Is adjusted, the impregnation rate of the impregnating liquid A can be changed.

As described above, since the driving roll 4 is rotated at a constant speed while partially immersed in the impregnating liquid A,
A constant amount of the impregnating liquid A always adheres to the concave groove 4a of the driving roll 4. Since the impregnating liquid A adhered to the knitting yarn 2, the knitting yarn 2 can always be impregnated with a constant amount of the impregnating liquid A. Therefore, the knitting yarn 2 can be uniformly impregnated with the impregnating liquid A, and the quality can be improved and the stability can be improved. The excess impregnating liquid A remaining in the concave groove 4a of the drive roll 4 without being impregnated into the knitting yarn 2 is again introduced into the impregnating liquid tank 6 and mixed with the impregnating liquid A therein. Therefore, there is no possibility that the excess impregnating liquid A solidifies in the concave groove 4a.

[Example] A knitting yarn 2 serving as a raw material yarn is formed into a single carbon fiber by forming short fibers, 99% by weight of polytetrafluoroethylene (PTFE) D-1 is used as an impregnating liquid A, and Prohite AS is used. Was impregnated with the knitting yarn impregnation method described in the above embodiment using a solution containing 1% by weight. FIG. 5 shows the transition of the yarn weight (g / 5 m) of the knitting yarn 2 after drying with the elapse of the operation time in this case. Here, the groove 4a of the drive roll 4 corresponds to the thread diameter of 1.8 to 2.0 mm.
The groove width dimension B (see FIG. 2) is 2.6 mm, which is a width through which the knot of the knitting yarn can pass. Further, the depth dimension H of the concave groove 4a
(See FIG. 2) is 8 mm, which is a depth which does not come off when the driven roll gets over the knot of the knitting yarn. Furthermore, yarn speed 10m
/ Min, the peripheral speed of the drive roll 4 is 1.4 m / min, and the drying condition is a residence distance in the drying furnace of 25 m. Here, it is observed how much the impregnating liquid A has been impregnated into the knitting yarn by the weight of the yarn after drying.

Next, as a comparative example, when the same knitting yarn and impregnating solution A as described above were impregnated by the conventional method, the yarn weight (g / 5 m) of the knitting yarn after drying with the elapse of the operation time. Is shown in FIG. At a yarn speed of 2 m / min, the drying conditions were a residence distance of 5 m in the drying furnace, and the accumulation of the squeezing roll was removed once every 30 minutes to one hour. In the comparative example, as shown in FIG. 6, the portion where the yarn weight after drying exceeds the required upper limit of 5.2 g / 5 m is considerably large. On the other hand, in the example, as shown in FIG. 5, the yarn weight after drying fluctuates between the required upper limit value and the lower limit value of 4.2 g / 5 m. Furthermore, in the example, the rate of change of the yarn weight after drying is smaller than that of the comparative example. In addition, the suitable impregnation rate as a knitting yarn for a gland packing is 25 to 40% by weight. Impregnation rate is 2
If it is less than 5% by weight, the effect of clogging is poor, and the impregnation rate is 40%.
If the content is more than 10% by weight, heat generation due to excessive sliding and variations in molding dimensions tend to occur.

In the above embodiment, carbon fibers are used as the knitting yarn 2, but the present invention is not limited to this.
For example, aramid fiber, expanded graphite fiber, carbonized fiber, ceramic fiber, glass fiber, fluororesin fiber, or the like may be used. In addition, although polytetrafluoroethylene is used as the impregnating liquid A, the present invention is not limited to this. For example, lubricating oils commonly used for packing such as mineral oil-based lubricants such as turbine oil, silicone oil, paraffin wax, and adhesives are used. It may be an agent.

[0017]

As described above, in the method and the apparatus for impregnating a knitting yarn according to the present invention, the drive roll is rotated at a constant speed while partially immersed in the impregnation liquid, and adheres to the concave groove of the drive roll. Since the impregnating liquid thus obtained is impregnated into the knitting yarn, a constant amount of the impregnating liquid can be always impregnated into the knitting yarn. Therefore,
The impregnating liquid can be uniformly impregnated in the knitting yarn, and the quality can be improved and the stability can be improved. Also, since the drive roll is rotated while partially immersed in the impregnating liquid, the impregnating liquid adhering to the driving roll does not solidify, compared to the conventional method in which excess impregnating liquid adhering to the knitting yarn was scraped off. As a result, the amount of waste is reduced, which leads to a reduction in waste disposal costs and resource conservation. In addition, since there is no need to perform the operation of removing the accumulation as in the past, unmanned operation becomes possible,
It can also be produced using nighttime electricity.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of a knitting yarn impregnating device according to the present invention.

FIG. 2 is a cross-sectional view of a driving roll and a driven roll used in the knitting yarn impregnating device.

FIG. 3 is an explanatory diagram showing a state of adhesion of an impregnating liquid to the driving roll.

FIG. 4 is a sectional view showing another embodiment of the driving roll and the driven roll.

FIG. 5 is a graph showing a change in yarn weight after drying of the knitting yarn with the elapse of operation time of the knitting yarn impregnating device.

FIG. 6 is a graph showing a change in yarn weight after drying of a knitting yarn with the elapse of operation time of a conventional knitting yarn impregnating device.

FIG. 7 is a schematic view showing an embodiment of a conventional knitting yarn impregnating device.

[Explanation of symbols]

 Reference Signs List A impregnating liquid 1 knitting yarn impregnating device 2 knitting yarn 3 raw yarn reel 4 drive roll 4a concave groove 5 driven roll 6 impregnating liquid tank 7 drying furnace 8 tensioning machine 9 winding reel 10, 11 guide roller

Claims (4)

[Claims] 1. A drive roll having a concave groove on the outer periphery, which is rotatably driven while partially immersed in an impregnating liquid for impregnating a knitting yarn, and provided above the drive roll. The knitting yarn is introduced between the driven roll and the driven roll at a predetermined speed, and the knitting yarn is impregnated with the impregnating liquid attached to the drive roll while pressing the knitted yarn with the driven roll. How to impregnate the yarn. 2. An impregnating liquid tank for containing an impregnating liquid for impregnating a knitting yarn; a driving roll driven to rotate while being partially immersed in the impregnating liquid; A driven roll that is provided movably up and down and presses the knitting yarn introduced into the groove of the drive roll, and a pulling machine that pulls the knitting yarn at a predetermined speed. Impregnation equipment. 3. The drive roll is capable of shifting.
A device for impregnating a knitting yarn according to item 1. 4. A driving roll having a concave groove on the outer periphery, which is rotatably driven while partially immersed in an impregnating liquid for impregnating a knitting yarn, and provided above the driving roll. A knitting yarn, characterized in that the knitting yarn is introduced at a predetermined speed between a driven roll and the impregnating liquid attached to the driving roll while the knitting yarn is pressed by the driven roll.