JP3704477B2 - Gland packing knitting yarn impregnation method, gland packing knitting yarn impregnation device, and gland packing knitting yarn - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a knitting yarn impregnation method, an impregnation apparatus, and a knitting yarn in which a knitting yarn for gland packing is impregnated with an impregnation liquid.
[0002]
[Prior art]
For example, for knitting yarn for string-like gland packing used for shaft seals of various devices such as pumps, agitators, valves, etc., to improve sealing performance and lubricity, for example, knitting yarn made of carbon fiber is used. Knitting yarn impregnated with a filling agent such as Teflon dispersion is used.
A conventional impregnation step of the filling agent will be briefly described with reference to FIG. As shown in FIG. 7, the knitting yarn 22 made of carbon fiber or the like is pulled out from the raw yarn reel 21 and immersed in an impregnation liquid tank 23 containing a filling agent for several seconds, and then an upper roll 24a and a lower roll 24b. Are introduced between the pressing surfaces of the squeezing roll 24. After squeezing off the excess filler adhering to the knitting yarn 22 by the squeezing roll 24, the knitting yarn 22 is introduced into a drying furnace 25 and dried. Thereafter, the film is wound up by a take-up reel 27 via a guide roller 26.
[0003]
[Problems to be solved by the invention]
However, in the above conventional impregnation method, the plugging agent removed by the squeezing roll 24 is dried and solidified and gradually accumulates on the pressing surface of the squeezing roll 24, and the upper roll 24a of the squeezing roll 24 and The space | interval with the lower roll 24b will be expanded. For this reason, the effect of removing the extra filler adhering to the knitting yarn 22 by the squeezing roll 24 gradually decreases, and the impregnation ratio of the filler into the knitting yarn 22 varies. At this time, if the impregnation rate is too high, the packing flows and the stress relaxation increases from the gap, and if the impregnation rate is too low, the sliding resistance reduction effect is not sufficient. In addition, finally, it becomes impossible to remove the plugging agent, and it is necessary to remove the accumulated matter on the squeezing roll 24.
In addition, since the knitting yarn 22 is pressed by the squeezing roll 24, there is also a problem that the knitting yarn 22 is broken 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, the accumulated matter adhering to the squeezing roll 24 needs to be treated as waste, which is a waste of resources. As well as processing costs.
The present invention has been proposed in view of the above circumstances, and provides a knitting yarn impregnation method, a knitting yarn impregnation device, and a knitting yarn that can uniformly impregnate a knitting yarn with an impregnation liquid. Objective.
[0004]
[Means for Solving the Problems]
The present invention employs the following means in order to achieve the above object. In other words, it has a concave groove on the outer periphery and is provided so as to be movable up and down above the concave groove of the drive roll that is rotationally driven in a state of being partially immersed in an impregnation liquid for impregnating the knitting yarn. The knitting yarn is introduced between the driven roll at a predetermined speed, the knitting yarn is sandwiched between the bottom surface of the concave groove and the driven roll, and knitted by the driven roll by the weight of the driven roll. A method is adopted in which the knitting yarn is impregnated with the impregnation liquid adhering to the drive roll while pressing the yarn (claim 1).
[0005]
Specifically, an impregnating liquid tank for containing an impregnating liquid for impregnating the knitting yarn, a driving roll that is rotationally driven in a state of being partially immersed in the impregnating liquid, and having a concave groove on the outer periphery, and above the driving roll vertically movably provided, sandwiching the knitting yarn to be introduced into the groove of the drive roll with the bottom surface of the groove, a predetermined and driven roller for pressing the knitting yarn by its own weight, the knitting yarn It implement | achieves by the impregnation apparatus of the knitting yarn for gland packing provided with the tension machine which pulls at the speed | rate of (Claim 2).
[0006]
In the present invention, a constant amount of impregnating liquid can always be adhered to the concave groove of the driving roll by rotating the driving roll at a constant speed while being partially immersed in the impregnating liquid. Since the knitting yarn is introduced between the driving roll and the driven roll and the knitting yarn is impregnated with the impregnating liquid adhering to the driving roll, the knitting yarn is always uniformly impregnated with a certain amount of the impregnating liquid. Can do. Further, since the knitting yarn introduced into the groove of the drive roll is pressed and compressed by the driven roll, the impregnating liquid adhering to the groove of the drive roll is released when the knitting yarn is released from the press and restored to the original shape. Absorbed and impregnated with the impregnating liquid up to the inside of the knitting yarn. In addition, it is preferable that the drive roll be variable in speed (Claim 3), and in this case, the impregnation rate into the knitting yarn can be changed as necessary.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic view showing an embodiment of a knitting yarn impregnation apparatus according to the present invention, and FIG. 2 is a sectional view of a drive roll and a driven roll used in the knitting yarn impregnation apparatus. Hereinafter, the configuration of the knitting yarn impregnation apparatus will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the knitting yarn impregnation apparatus 1 mainly feeds a yarn reel 3 for supplying a knitting yarn 2 made of carbon fiber as a raw material yarn to an upstream portion, and the knitting yarn 2 to a predetermined position. The guide rollers 10 and 11, the driving roll 4 and the driven roll 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 yarn 2 impregnated with the impregnating liquid A are dried. A drying furnace 7 for pulling the knitting yarn 2 at a constant speed, and a take-up reel 9 for winding the knitting yarn 2 are provided.
[0008]
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. As shown in a cross section in FIG. 2, the drive roll 4 is provided with a concave groove 4a along the outer periphery and a drive shaft 4b at the center. The drive shaft 4b is connected to a drive unit (not shown), and rotates the drive roll 4 at a constant predetermined speed. The drive unit includes a speed change mechanism and can change the rotation speed of the drive roll 4.
[0009]
The driven roll 5 is provided above the drive roll 4 and is rotatable about a rotation shaft 5a provided at the center thereof. The rotary shaft 5a is held by a frame (not shown) so as to be movable up and down so that the driven roll 5 can be moved up and down. Further, the driven roll 5 sandwiches the knitting yarn 2 introduced into the concave groove 4a of the drive roll 4 between the bottom surface of the concave groove 4a and applies pressure to the knitting yarn 2 by its own weight. ing.
[0010]
In addition, the shape of the groove 4a formed in the drive roll 4 is not limited to the shape in which the groove bottom surface is a flat surface as shown in FIG. 2, for example, the shape in which the groove bottom surface is a curved surface as shown in FIG. (FIG. 4 (a)), the groove bottom surface may be tapered (FIG. 4 (b)), or the like. Similarly, the shape of the follower roll 5 is not limited to a shape having a flat outer peripheral surface as shown in FIG. 2. For example, a shape having a curved outer peripheral surface as shown in FIG. )), A shape in which the outer peripheral surface narrows in a tapered shape (FIG. 4D) or the like. Furthermore, the combination of the drive roll 4 and the driven roll 5 of each shape can be selected as appropriate. However, when the concave groove 4 a 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 is reduced.
Further, in the present embodiment, the case where there is one drive roll 4 and one follower roll 5 is shown, but usually a plurality of pairs of drive rolls 4 and follower rolls 5 are provided so that a plurality of knitting yarns 2 are simultaneously provided. Impregnation takes place.
[0011]
Next, the process of impregnating the knitting yarn 2 with the impregnating liquid A using the knitting yarn impregnation apparatus 1 will be described.
The knitting yarn 2 supplied from the raw yarn reel 3 is introduced between the drive roll 4 and the driven roll 5 by the guide roller 10. Here, the knitting yarn 2 is moved at a constant speed by the tensioner 8.
On the other hand, the drive roll 4 rotates while being partially immersed in the impregnating liquid A, and even after the drive roll 4 is removed from the impregnating liquid A, the impregnating liquid A enters the concave grooves 4a of the driving roll 4 as shown in FIG. It is attached. The knitting yarn 2 introduced into the concave groove 4a of the drive roll 4 in this state is pressed and compressed by the driven roll 5. When the knitting yarn 2 is released from the pressing by the driven roll 5 and is restored to the original shape, the knitting yarn 2 absorbs the impregnating liquid A adhering to the concave groove 4a of the drive roll 4 as described above, and reaches the inside of the knitting yarn 2. Impregnation 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. The peripheral speed of the drive roll 4 is normally set to be slower than the moving speed of the knitting yarn 2.
[0012]
Next, the knitting yarn 2 impregnated with the impregnation 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 ensure 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 tension machine 8.
Since the impregnation ratio of the impregnating liquid A into the knitting yarn 2 is determined by the rotational speed of the driving roll 4 with respect to the moving speed of the knitting yarn 2, the rotational speed of the driving roll 4 is changed to change the relative speed with respect to the moving speed of the knitting yarn 2. By adjusting the ratio, the impregnation ratio of the impregnating liquid A can be changed.
[0013]
As described above, since the driving roll 4 is rotated at a constant speed while being 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. Become. Since the knitting yarn 2 is impregnated with this impregnating liquid A, the knitting yarn 2 can always be impregnated with a certain amount of the impregnating liquid A. Therefore, the knitting yarn 2 can be uniformly impregnated with the impregnating liquid A, and quality can be improved and stabilized. The excess impregnating liquid A remaining in the concave groove 4a of the drive roll 4 without being impregnated in the knitting yarn 2 is reintroduced 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 is hardened in the concave groove 4a.
[0014]
[Example]
A carbonized fiber obtained by making a short fiber into a knitting yarn 2 as a raw material yarn, and a solution containing 99% by weight of polytetrafluoroethylene (PTFE) D-1 and 1% by weight of pro-height AS as impregnating liquid A The impregnation was performed by the knitting yarn impregnation method described in the above embodiment. FIG. 5 shows the transition of the yarn weight (g / 5 m) after drying of the knitting yarn 2 with the elapse of the operation time in this case.
Here, with respect to the yarn diameter of 1.8 to 2.0 mm, the groove width dimension B (see FIG. 2) of the concave groove 4a of the drive roll 4 is 2.6 mm, which is a width through which the knot of the knitting yarn can pass. The depth dimension H (see FIG. 2) of the concave groove 4a is 8 mm, which is a depth that does not come off when the driven roll gets over the knot of the knitting yarn. Furthermore, with respect to the yarn speed of 10 m / min, the peripheral speed of the drive roll 4 is 1.4 m / min, and the drying condition is 25 m in the dwelling distance in the drying furnace.
Here, it is observed how much the knitting yarn is impregnated with the impregnating liquid A based on the yarn weight after drying.
[0015]
Next, as a comparative example, the change in yarn weight (g / 5 m) after drying of the knitting yarn with the lapse of the operation time when impregnating with the same knitting yarn and impregnation liquid A as described above by a conventional method is shown. As shown in FIG. The yarn speed was 2 m / min, the drying condition was 5 m in the dwelling distance in the drying furnace, and the squeeze roll was removed about once every 30 minutes to 1 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 increased. On the other hand, in the Example, as shown in FIG. 5, the yarn weight after drying changes between the above upper limit value and 4.2 g / 5 m which is the lower limit value. Furthermore, in the examples, the rate of change in the yarn weight after drying is also smaller than in the comparative examples. In addition, the suitable impregnation rate as a knitting yarn for gland packing is 25 to 40 weight%. When the impregnation ratio is less than 25% by weight, the clogging effect is poor, and when the impregnation ratio exceeds 40% by weight, heat generation due to oversliding and variations in molding dimensions are likely to occur.
[0016]
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 fibers, expanded graphite fibers, carbonization resistant fibers, ceramic fibers, glass fibers, fluororesin fibers And so on. In addition, polytetrafluoroethylene is used as the impregnating liquid A, but is not limited thereto. For example, mineral oil-based lubricants such as turbine oil, lubrication normally used for packing such as silicone oil, paraffin wax, and adhesives. It may be an agent.
[0017]
【The invention's effect】
As described above, in the knitting yarn impregnation method and apparatus according to the present invention, the impregnating liquid adhering to the groove of the driving roll is knitted by rotating the driving roll at a constant speed while being partially immersed in the impregnating liquid. Since the yarn is impregnated, it is possible to always impregnate the knitting yarn with a certain amount of impregnation liquid. Further, since the knitting yarn introduced into the groove of the drive roll is pressed and compressed by the driven roll, the impregnating liquid adhering to the groove of the drive roll is released when the knitting yarn is released from the press and restored to the original shape. Absorbed and impregnated with the impregnating liquid up to the inside of the knitting yarn. Therefore, the knitting yarn can be uniformly impregnated with the impregnation liquid, and the quality can be improved and stabilized. In addition, since the drive roll is rotated while being partially immersed in the impregnating liquid, the impregnating liquid adhering to the driving roll does not solidify, and compared with the conventional method in which the impregnating liquid adhering to the knitting yarn is squeezed off. As a result, the amount of waste is reduced, leading to a reduction in waste disposal costs and resource protection. In addition, since the conventional work for removing stagnant materials is not required, unmanned operation is possible, and production can be performed using nighttime power.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a knitting yarn impregnation apparatus 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 impregnation apparatus.
FIG. 3 is an explanatory view showing an adhesion state of an impregnating liquid to the driving roll.
FIG. 4 is a cross-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 lapse of operating time of the knitting yarn impregnation apparatus.
FIG. 6 is a graph showing changes in yarn weight after drying of a knitting yarn with the lapse of operating time of a conventional knitting yarn impregnation apparatus.
FIG. 7 is a schematic view showing an embodiment of a conventional knitting yarn impregnation apparatus.
[Explanation of symbols]
A Impregnating liquid 1 Knitting yarn impregnating device 2 Knitting yarn 3 Raw yarn reel 4 Drive roll 4a Concave groove 5 Followed roll 6 Impregnating liquid tank 7 Drying furnace 8 Pulling machine 9 Take-up reel 10, 11 Guide roller

Claims (4)

The concave groove of the drive roll which has a concave groove on the outer periphery and is rotationally driven in a state of being partially immersed in an impregnation liquid for impregnating the knitting yarn, and a follower provided to be movable up and down above the drive roll The knitting yarn is introduced between the rolls at a predetermined speed, the knitting yarn is sandwiched between the bottom surface of the concave groove and the driven roll, and the knitting yarn is driven by the driven roll by the weight of the driven roll. A method for impregnating a knitting yarn for gland packing, wherein the knitting yarn is impregnated with the impregnating liquid adhering to the drive roll while pressing. An impregnation liquid tank for containing an impregnation liquid for impregnating the knitting yarn;
A drive roll that is rotationally driven in a state of being partially immersed in the impregnating liquid and has a concave groove on the outer periphery;
A driven roll provided above the drive roll so as to freely move up and down , sandwiching the knitting yarn introduced into the concave groove of the drive roll between the bottom surface of the concave groove and pressing the knitting yarn by its own weight ; ,
An apparatus for impregnating a knitting yarn for gland packing, comprising: a tension machine that pulls the knitting yarn at a predetermined speed. The impregnation device for a gland packing yarn according to claim 2, wherein the drive roll is variable. The concave groove of the drive roll that has a concave groove on the outer periphery and is rotationally driven in a state of being partially immersed in the impregnating liquid for impregnating the knitting yarn, and a follower that is provided above and below the drive roll so as to be movable up and down. The knitting yarn is introduced between the rolls at a predetermined speed, the knitting yarn is sandwiched between the bottom surface of the concave groove and the driven roll, and the knitting yarn is moved by the driven roll by the weight of the driven roll. A knitting yarn for gland packing, which is impregnated with the impregnation liquid adhering to the drive roll while being pressed.

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