JPH045766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reduced-pressure atmosphere spinning apparatus in which yarn is melt-spun into a spinning chamber that is maintained at a lower pressure than an outside air normal pressure section, and is led to the outside air normal pressure section after being cooled and solidified.

The technology of melting and discharging yarn from a spinneret into a spinning chamber whose pressure is lower than that of the outside atmospheric pressure section was developed by the Tokuko Showa Institute.
This is already known from the publication No. 57-8206.

The spinning apparatus described in this publication seals the yarn outlet of the spinning chamber with a rubber roller or orifice, reduces the pressure in the spinning chamber by atmospheric pressure to a water column of 40 cm or more, and heats the yarn in the spinning chamber to a glass transition point +50. It is used to cool down to ℃.

However, in this technique, the sealing between the rubber roller of the rotating body and the spinning chamber that supports the roller must be performed in a non-contact state, and the area of the opening to the outside air normal pressure section becomes large. Furthermore, due to the rotational movement of the rubber roller, air from the outside atmospheric pressure section flows into the spinning chamber through the opening, thereby further reducing the sealing state.

Furthermore, since the yarn take-up speed is determined by the circumferential speed of the rubber roller in the sealing section, there is a drawback that high-speed spinning is not possible.

As for the seal by the orifice, its structure is to arrange a plurality of orifices in multiple stages at the bottom of the spinning cylinder, as described in column 4, line 39 to column 5, line 4 and FIG. Accordingly, a plurality of decompression chambers are provided, and the exhaust volume from the decompression chambers is sequentially increased as the decompression chambers are located inside the spinning tube, so the capacity of the exhaust device increases and the length of the spinning tube increases. There were problems such as the length of the yarn and the difficulty in threading the yarn at the beginning of operation.

Therefore, as can be seen from the experimental results described in the Examples, it is not appropriate to maintain the spinning chamber under a reduced pressure of 300 cm or more of water column than the normal pressure part of the outside air or to perform high-speed spinning of 2000 m/min or more. becomes difficult under such conditions.

Furthermore, in this technique, the pack body to which the spinneret is attached and the vacuum spinning chamber are integrally connected with bolts. By the way, in a spinning device, in order to prevent spinning troubles, impurities such as low-molecular substances and thermal decomposition melts that adhere to around the nozzle discharge hole are removed.
The so-called spinneret correction work is required, but the spinning apparatus described in the above-mentioned publication does not have a working space below the spinneret, so the spinneret correction work, and furthermore, the yarn spinning after the spinneret correction is carried out at the time of spinning starter. It becomes very difficult to thread the yarn into the spinning chamber at the beginning.

To do this, it is necessary to remove and separate the fastening part between the pack body and the spinning chamber, and then reattach the spinning chamber to the pack body after completing the work. It also had the disadvantage of not being able to continue.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide a seal structure at the bottom of the spinning chamber that can maintain the inside of the spinning chamber at a higher degree of depressurization than the outside atmospheric pressure section with a simple structure. In addition, it is an object of the present invention to provide a reduced-pressure atmosphere spinning apparatus that can secure a working space below the spinneret while maintaining airtightness in the spinning chamber, and that can easily perform corrections of the spinneret.

The structure of the present invention that achieves the above object is as follows. That is, (a) a spinneret portion for discharging the synthetic resin melted by the melt extruder of the spinning device as yarn; Forms part of the spinning chamber under the spindle that extends to the solidification point of the yarn,
and (c) a movable cylinder configured to be easily separable and movable from the spinneret, and (c) forming a spinning chamber other than a part of the spinning chamber, and capable of sliding with respect to the movable cylinder. (d) a first sealing member interposed between the mouthpiece and the movable cylinder; (e) the movable cylinder; (f) a second sealing member interposed between the body and the fixed cylinder; (g) a seal guide that is fluidly sealed and has a length and a slit large enough for the yarn to pass through; or a moving means for separating and moving the yarn from the spinneret; (h) a depressurizing means for maintaining the inside of the spinning chamber at a lower pressure than the outside atmosphere; and (li) a take-off means for running and taking the yarn. A reduced pressure atmosphere spinning apparatus is characterized by comprising: means. Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a schematic diagram showing a typical embodiment of a reduced pressure atmosphere spinning apparatus according to the present invention.

In the figure, 1 is a spinning machine, and the spinning machine is
It consists of a raw material hopper 2 into which chips T are charged, a melt extruder 3, a metering pump 4, a motor 5 with a transmission, a pack 6, and a nozzle 7.

The chips T from the raw material chips 2 are passed through the metering pump 4 in a molten state by the melt extruder 3 in the spinning machine 1, filtered by a filter (not shown) in the pack 6, and then passed from the spinneret 7. It is melt-spun as yarn Y. The metering pump 4 is connected to a motor 5 with a transmission.
By controlling the output rotation speed of the yarn Y, the discharge amount of the yarn Y can be determined.

In the present invention, the pack 6 equipped with the cap 7 is
There is a spinning tube S in a reduced pressure atmosphere, which is the spinning chamber under the nozzle.
is provided, and gas is sucked and discharged from the inside of the spinning cylinder.

The reduced pressure atmosphere spinning tube S will be described in more detail below.

Directly below the spinneret, a heating cylinder 8 is attached to the spinning machine 1 as required, and below the heating cylinder 8, a heat insulating cylinder 11 is attached. Although the heating cylinder 8 can be used when melt-spinning a polymer with high melt viscosity, it is not necessary to use it when melt-spinning a low-viscosity polymer. Further, the heating cylinder 8 is provided with a thermocouple 9, and the thermocouple 9 is connected to a temperature controller 10 so that the atmospheric temperature within the heating cylinder can be controlled to a set value. The temperature controller 10 is configured to control a heater (not shown) built in the heating cylinder and to set the atmospheric temperature inside the heating cylinder to a set value.

Below the heat insulating cylinder 11, there are a movable cylinder 13 and a fixed cylinder 14 that constitute the spinning cylinder S. The movable cylinder 13 is housed in a fixed cylinder 14 and operates in conjunction with a cylinder 15 which is a moving means attached to the movable cylinder, and when the cylinder is operated, the fixed cylinder is moved through a guide rod 16 for raising and lowering the cylinder. It is designed to be able to move up and down within the body 14.

With this structure, the movable cylinder 13 can be moved to the cylinder 15 as shown in FIG. lower it by
A working space A can be easily provided between the lower end of the heat insulating cylinder 11 and the upper end of the movable cylinder 13, thereby creating an environment in which the operator can easily work. In addition, when winding in a normal reduced pressure atmosphere, the cylinder 1
5, the movable cylinder 13 can be pressed upwardly to the lower end of the heat insulating cylinder 11.

Note that a sealing member 12 (first sealing member) such as an O-ring is provided at the pressure contact portion between the movable cylinder 13 and the heat insulating cylinder 11, and also at the sliding portion between the movable cylinder 13 and the fixed cylinder 14. 12' (second sealing member) to prevent leakage.

As described above, according to the present invention, simply by raising and lowering the cylinder 15 connected to the movable cylinder 13,
Pack 6 with cap 7 attached, heating cylinder 8, heat insulating cylinder 1
1, the spinning tube S consisting of the movable cylinder 13 and the fixed cylinder 14 can be easily separated and moved. Note that, as described above, the heating cylinder 8 and the heat insulating cylinder 11 may not be provided in the base portion.

As shown in this embodiment, the structure in which the movable cylinder 13 of the spinning tube S is movable up and down with respect to the spinneret makes it possible to work with the apparatus while the spun yarn is still running. Although it is necessary in that it is possible to do so, it is also possible to adopt another embodiment, for example, a structure that can be moved in a direction perpendicular to the running direction of the yarn, for example, in the front and back or left and right directions in the drawings. That is, in the present invention, a space is created below the spinneret where the operator can easily work, and after the work is finished, the spinneret and the spinning tube can be immediately integrated, and the O-ring, square ring, packing, metal ring, etc. It is important to have a structure that does not leak through sealing members such as.

The base portion is not limited to the above-described embodiment, and the heating tube 8 and the heat insulating tube 11 may be attached to the movable cylinder 13 using only the pack 6 to which the base 7 is attached.

As shown in FIG. 3, the yarn exit portion at the lower end of the fixed cylinder 14 has a minute slit 24 that is large enough for the yarn to pass through, and the pressure loss due to the resistance of the slit portion substantially eliminates fluid flow. A guide holder 2 equipped with a seal guide 20 that ensures sufficient sealing performance.
1 and 21' (see FIGS. 1 and 2) are attached {FIG. 3 A shows a plan view, B shows a side view}.
A vacuum pump 22 is installed near the seal guide 20.
A piping 19 connected to the vacuum pump 22 and the fixed cylinder 14 is provided. Therefore,
The spinning tube S can be created by simply pressing the movable tube 13 against the heat insulating tube 11 with the fixed tube 14 fixed, thereby creating a sealed space from directly below the spinneret 7 to the seal guide 20 at the lower end of the fixed tube 14. In other words, the reduced-pressure atmosphere chamber Sa below the base can be easily obtained.

A vacuum gauge 23 is attached to the reduced pressure atmosphere chamber Sa, and the vacuum gauge 23 detects the degree of reduced pressure in the reduced pressure atmosphere chamber Sa, and the detection signal is sent to the controller 1.
8, and the controller 18 controls the vacuum pump 22, which is a pressure reducing means, so that the degree of pressure reduction is constant.

Decompressed atmosphere chamber at the bottom of the cap that is maintained in a depressurized state
When the melt-spun yarn Y is discharged from the spinneret 7 into the Sa, the yarn Y is caused to travel through a slow cooling area in the heating cylinder 8 maintained at a set temperature by the temperature controller 10, and then is moved to a reduced pressure atmosphere chamber. It travels inside the Sa, during which cooling is accelerated and solidified.

The cooled and solidified yarn Y passes through a seal guide 20 and is applied with a lubricant by a guide lubricant device 17 provided in an outside atmospheric pressure section, and then transferred to a first godet roll 25 which is a take-up means that rotates at a constant circumferential speed. Further, it passes through the second Gotey roll 26 and is wound onto a bobbin 30 of a winding machine 29.

A tension detector 27 is provided between the second gote roll 26 and the winder 29, and the tension detector detects the winding tension of the yarn Y.
The detected tension value is input to the controller 28, and the controller 28 controls the rotation speed of the bobbin 30 of the winder 29 so that the winding tension is constant.

Further, in the embodiment shown in the drawings, air is used as the reduced pressure gas in the reduced pressure atmosphere chamber Sa, but nitrogen, water vapor, or other gases may be used depending on the purpose.

According to this embodiment, the yarn Y is wound after once relaxing the spinning tension with the gote rolls 25 and 26, but the so-called direct spinning and drawing method is adopted in which the yarn Y is stretched and wound with one or two or more stages of the gote rolls. You can also.

The lubricant may be applied at any position after the yarn Y has been cooled and solidified, and may be installed not only in the normal pressure part of the outside air but also in the reduced pressure atmosphere chamber Sa below the mouthpiece depending on the conditions. . Furthermore, the seal guide 20 may be provided with a function of applying a lubricant, and the seal guide 20 may also serve as a lubricant to the yarn.

Regarding the lubricant applying device, the guide lubricating device 17 is preferably used in high-speed spinning of 3000 m/min or more, but other roller lubricating devices may be used.

Further, depending on the conditions, the outer wall of the fixed cylinder 14 may be cooled to improve the cooling effect. Furthermore,
Means such as a heat pipe may be used to directly cool the atmospheric temperature within the reduced pressure atmosphere chamber Sa. Further, although not shown, an airflow blowing section may be provided within the spinning cylinder. Also, a blower or the like may be used instead of the vacuum pump.

Since the present invention employs the reduced-pressure atmosphere spinning apparatus as described above, it exhibits the following excellent effects. That is, A. In conventional reduced-pressure atmosphere spinning devices, the spinning chamber must have an airtight structure, so the spinning cylinder forming the spinning chamber was fixed to the spinneret, but in the present invention, the spinning chamber forming the spinning chamber As a spinning cylinder, there is a movable cylinder that can be pressed against or separated from the mouthpiece via a first sealing member and moved, and a fixed cylinder that is slidably engaged with the movable cylinder via a second sealing member. Since the spinning chamber is provided with a body, a highly airtight spinning chamber can be easily obtained while having a structure in which a working space can be formed under the spinneret.

B As described above, the structure allows for easy creation of a working space under the spinneret, so when making periodic adjustments to the spinneret, unexpected spinning troubles, or when threading starts, the spinneret can be immediately removed. A work space is formed by separating the movable cylinder from the workpiece, and the worker can use this space to quickly perform the above-mentioned work.

C After the above work is completed, the movable cylinder can be directly pressed against the mouthpiece using the moving means.
It is possible to shorten recovery work time and reduce labor.

D Unlike the conventional seal structure in which thin-blade orifices are arranged in multiple stages, the yarn outlet section of the device of the present invention is equipped with a slit guide having a slit having a constant length along the yarn traveling direction. Due to the pressure loss caused by the resistance of the slit, the inside of the spinning chamber can be maintained in a reduced pressure state that is much more airtight than the outside atmosphere.

[Brief explanation of drawings]

1 and 2 are schematic diagrams showing typical embodiments of the reduced pressure atmosphere spinning device according to the present invention, and FIG. 3 shows an embodiment of a seal guide applied to the device of the present invention. , A shows a plan view, and B shows a side view. Explanation of symbols in the drawings: 1... Spinning machine, 2... Raw material hopper, 3... Extruder, 4... Metering pump, 5... Motor with variable speed gear, 6... Pack, 7... Spinneret, 8... Heating cylinder, 9... Thermocouple,
10...Temperature controller, 11...Insulating tube, 1
2, 12'... Seal member, 13... Movable cylinder body,
14...Fixed cylindrical body, 15...Cylinder, 16...
... Cylinder lifting guide rod, 17 ... Oil application device, 18 ... Pressure controller, 19 ... Exhaust piping, 20 ... Seal guide, 21, 21' ...
Holder, 22... Vacuum pump, 23... Vacuum gauge, 24... Seal guide slit, 25...
1st gote roll, 26... 2nd gote roll,
27... Tension detector, 28... Winding machine controller, 29... Winding machine, 30... Bobbin, S... Spinning tube.

Claims (1)

[Scope of Claims] 1. (a) A spinneret portion for discharging synthetic resin melted by a melt extruder of a spinning device as a thread; (b) A spinneret portion surrounding the spinneret portion and in a traveling direction of the yarn. forming a part of a spinning chamber under the spinneret extending along at least to the solidification point of the yarn;
and (c) a movable cylinder configured to be easily separable and movable from the spinneret, and (c) forming a spinning chamber other than a part of the spinning chamber, and capable of sliding with respect to the movable cylinder. (d) a first sealing member interposed between the mouthpiece and the movable cylinder; (e) the movable cylinder; (f) a second sealing member interposed between the body and the fixed cylinder; (g) a seal guide that is fluidly sealed and has a length and a slit large enough for the yarn to pass through; or a moving means for separating and moving the yarn from the spinneret; (h) a depressurizing means for maintaining the inside of the spinning chamber at a lower pressure than the outside atmosphere; and (li) a take-off means for running and taking the yarn. A reduced-pressure atmosphere spinning device characterized by comprising: means;