JP4744036B2 - Humidity control equipment for stretched film production equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a facility for producing a biaxially (orientated) stretched film made of a thermoplastic, and is capable of preventing the occurrence of meandering and wrinkling of the unstretched film when humidity is controlled by passing through a hot water tank before stretching. Relates to the device.
[0002]
[Prior art]
For example, in a biaxially stretched film manufacturing facility, before introduction into a stretching machine, the unstretched film is conditioned to reduce plasticity by appropriately plasticizing the unstretched film and minimizing cutting during stretching. It introduce | transduces into the warm water tank of an apparatus via a some guide roll, and is immersed for a predetermined time.
[0003]
The guide roll is made of rubber that can guide the unstretched film smoothly because warm water enters between the unstretched film and the unstretched film is thick at both ends in the width direction (TD direction) and thin at the center. A roll is generally adopted.
[0004]
[Problems to be solved by the invention]
By the way, when the operation time elapses, the rubber roll is gradually swollen by hot water, the roll diameter is changed, and the peripheral speed is changed. Moreover, the roll diameter does not increase in all rubber rolls at the same ratio, and even in the same rubber roll, the roll diameters are different at positions along the axial direction.
[0005]
For this reason, the unstretched film at the time of humidity control reaches the glass transition point and is in a softened state, and in the portion where the tensile force acts, it is easily stretched in the machine direction (MD direction), the film width becomes narrower, and further stretching As the process proceeds, longitudinal wrinkles occur in the unstretched film. In addition, an unstretched film that travels in a partially slack state can easily meander due to a large amount of hot water being interposed between the guide rolls and a large wrinkle may remain when the travel position is corrected. Furthermore, when a strong tensile force is applied next to running in a slack state, wrinkles are formed on the spot. These wrinkles not only cause a coating streak and significantly reduce product quality, but also cause cutting of the film. In addition, because the unstretched film width is not stable, the simultaneous biaxial stretching machine has a kick-out phenomenon that causes the link lever to pop out the sheet edge when the film width is wide, and a film caused by a clip during stretching when the film width is narrow. There is a risk of jumping ears, which may cause a disconnection.
[0006]
The present invention solves the above problems and provides a humidity control apparatus for a stretched film manufacturing facility that can prevent wrinkling by preventing meandering of an unstretched film traveling in a hot water tank and can stably control humidity. The purpose is to do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a humidity control apparatus for a stretched film manufacturing facility that introduces an unstretched film into a hot water tank, immerses it in warm water for a predetermined time, and sends it to a stretching machine. In addition, the outlet of the hot water tank is provided with a derivation roll means that can swing the adjustment roll around an axis perpendicular to the film surface by a roll oscillating device to detect the end of the unstretched film led out from the hot water tank. And a meandering control means for adjusting the lead-out position of the unstretched film by swinging the adjustment roll by operating the lead-out roll means based on the detection signal of the end-point detection means. It is.
[0014]
According to the above configuration, the end position of the unstretched film is detected by the end detection means, and the roll swinging device is driven by the meander control means based on this detection signal to swing the adjustment roll, thereby The drawing position of the stretched film can be corrected. Therefore, meandering of the unstretched film can be prevented and stable humidity control is possible.
[0015]
According to a second aspect of the present invention, in the first aspect of the invention , the end position detecting means has a contact that abuts the end of the unstretched film at the input end, and a detection piece is attached to the output end. A swing link supported so as to be swingable about an axis parallel to the running direction of the unstretched film, and air pressure of detection air blown to a detection piece of the swing link, the unremoved film is not passed through the swing link. It is comprised with the air sensor part which can detect an extending | stretching film edge part.
[0016]
According to the above configuration, since the end portion of the unstretched film is indirectly detected by the air sensor via the swing link, even if moisture is contained in the unstretched film, there is no malfunction due to moisture. The end position of the unstretched film can be detected with accuracy.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Here, an embodiment of a humidity control apparatus for a biaxially stretched film manufacturing facility according to the present invention will be described with reference to FIGS.
[0018]
This film manufacturing equipment manufactures single-layer plastic films (hereinafter abbreviated as film) such as polyamide, nylon, polyester, PDT, and polyolefin, which are thermoplastic polymer compounds, and laminated films of multiple layers. As shown in FIG. 6, the film F formed from the extruder 1 through the die 2 is brought into close contact with the cooling drum (casting roll) 3 and rapidly cooled, and the unstretched film F is formed.
[0019]
This unstretched film F is introduced into the hot water tank 11 for humidity control of the humidity control apparatus 4 according to the present invention, and immersed in the predetermined time corresponding to the type of resin by the plurality of guide rolls 12u and 12d, The film F is appropriately plasticized to suppress crystallization, and the cutting in the drawing operation is minimized.
[0020]
The unstretched film F after humidity adjustment is introduced into a flat type stretching machine 5 that is biaxially stretched simultaneously, and as shown in FIG. 3, both ends are held by a plurality of clips 11 and the stretching ratio in the longitudinal direction is increased. The film is stretched to 2.0 to 5.0 times so that the transverse stretching ratio is 2.0 to 4.0 times. Further, the stretched film F is heat-treated by the heat treatment means 6 and then taken up by the winder 7.
[0021]
As shown in FIG. 1, the humidity control device 4 has a lead-out roll device (lead-out roll means) 20 having an introduction roll 13 disposed at the inlet of the hot water tank 11 and a pair of front and rear adjustment rolls 14F and 14R at the outlet. Is provided.
[0022]
Further, between the introduction roll 13 and the adjustment rolls 14F and 14R, the upper guide roll 12u disposed on the hot water surface of the hot water tank 11 with a predetermined interval from the inlet side to the outlet side, and the hot water tank 11 A lower guide roll 12d arranged at a predetermined interval from the inlet side to the outlet side is arranged on the upper side, and the unstretched film F is bypassed at the upper and lower sides via the upper and lower guide rolls 12u and 12d to immerse the hot water surface. Is configured to do. And four upper and lower guide rolls 12u and 12d are divided into four in order from the entrance side, for example, the 1st-4th roll group AD is provided.
[0023]
For example, as shown in FIG. 2, the first to fourth roll groups A to D are connected and interlocked by a winding transmission mechanism 15 including a sprocket 15a and a chain 15b, and first to first roll groups 16A to 16D are connected to the first to fourth roll groups A to D, respectively. The upper and lower guide rolls 12u and 12d are driven to rotate synchronously for each of the fourth roll groups A to D. A roll speed control device (speed adjustment means) 17 capable of adjusting the rotation speed of the upper and lower guide rolls 12u, 12d of the first to fourth roll groups A to D is provided. A speed command value is output to the motor controllers 16a to 16D of the roll drive motors 16A to 16D.
[0024]
The roll speed control device 17 receives the rotational speed detected by the rotary encoders 18A to 18D provided in the roll drive motors 16A to 16D. By the way, at the inlet and outlet of the hot water tank 11, the unstretched film F is stretched by being conditioned, but if the rotational speed of the fourth roll group D is too high compared to the first roll group A, the unstretched film F is If pulled too much, the width may shrink and break. On the other hand, if the rotation speed of the fourth roll group D is too slow, the stretch of the unstretched film F becomes too loose and may meander and break. Therefore, in this roll speed control device 17, the moving speed of the unstretched film F is calculated from the rotational speeds of the roll drive motors 16A to 16D and the diameters of the guide rolls 12u and 12d, and the unstretched first roll group A at the inlet end is calculated. The rotation speeds of the roll drive motors 16A to 16D are controlled so that the feed speed of the unstretched film F of the fourth roll group D at the outlet end does not exceed 5 mm / second from the feed speed of the film F. Thereby, it can prevent that the unstretched film F is pulled too much and fractures.
[0025]
In addition, although the rotational speed control of roll drive motor 16A-16D was automatically performed by the said roll speed control apparatus 17, the rotational speed meter of each roll drive motor 16A-16D and the movement state of the unstretched film F were visually observed. However, the rotation speed of the roll drive motors 16A to 16D can be manually controlled by an operator so that the difference between the feed speeds at the inlet and the outlet is 5 mm / second, and the speed adjusting means is configured manually. You can also.
[0026]
Further, as shown in FIGS. 3 and 4, the lead-out roll device 20 has a shaft body 23 perpendicular to the surface of the unstretched film F to which the roller table 22 is conveyed, on a support base 21 attached to the hot water tank 11. A pair of front and rear adjustment rolls 14F and 14R are rotatably supported on the roller table 22. A hydraulic swing cylinder 29 is connected between the support base 21 and the roller table 22, and the adjustment rolls 14 </ b> F and 14 </ b> R can be swung around the shaft body 23 via the roller table 11.
[0027]
A plurality of indirect end air sensors (end position detecting means) 24 for detecting the end position of the unstretched film F fed downward from the rear adjusting roll 14R are provided on both sides below the rear part of the lead-out roll device 15. It is arranged in each part. As shown in FIG. 5, the end air sensor 24 includes a swing link 25 and an air sensor portion 26, and the swing link 25 is swingably supported via a pin 25 a parallel to the traveling direction of the unstretched film F. A contact 25b that contacts the end of the unstretched film F is attached to the input end, and a detection piece 25c parallel to the unstretched film F is attached to the output end. The air sensor unit 26 is configured such that a U-shaped sensor body 26a is loosely fitted to the detection piece 25c, and the detection air is blown from the nozzle hole 26b of the sensor body 26a to the detection piece 25c, and the position of the detection piece 25c is determined by the air pressure. Can be detected. Thereby, even if moisture adheres to the unstretched film F, the end position of the unstretched film F can be accurately detected without malfunction.
[0028]
Further, based on the detection signal of the end air sensor 24, the meandering control device (meandering control) for adjusting the lead-out position of the unstretched film F by operating the swing cylinder 29 of the lead-out roll device 15 and swinging the adjusting rolls 14F and 14R. Means) 27 is provided.
[0029]
For example, when the end air sensor 24 detects that the unstretched film F is shifted to the left side in the film transport direction, the meandering control device 27 detects the swing cylinder 29 from the switching valve 28 based on this detection signal. An operation signal is output to the switching valve 28 so that the hydraulic pressure is supplied to the side that contracts, and the roller table 11 and the adjustment rolls 14F and 14R are swung to the right R. As a result, the unstretched film F that has been led to the left is shifted to the right and returned to the normal position. When the end air sensor 24 detects that the unstretched film F has returned to the normal position, the swinging cylinder 29 is advanced via the switching valve 28 by the meandering control device 27, and the roller table 11 and the adjusting roll 14F. , 14R are returned to the normal position.
[0030]
In the above configuration, the thermoplastic polymer compound material is heated and melted by the extruder 1 and extruded from the extruder 1 through the die 2, wound on a cooling roll 3 having a surface temperature of 0 to 25 ° C., rapidly cooled and unstretched. A film F is formed. The unstretched film F is guided by the humidity control device 4 from the introduction roll 12 to the guide rolls 12u and 12d of the first to fourth roll groups A to D and is heated to 20 to 80 ° C. in the hot water tank 11 for about 10 minutes. It is immersed and led out through adjusting rolls 14F and 14R. Then, the film is stretched simultaneously at a predetermined stretching temperature by a stretching machine 5 in a longitudinal direction and a transverse direction at a predetermined magnification, for example, 2.0 to 4.0 times, and further, heat setting treatment, heat relaxation treatment, and cooling treatment are performed by heat treatment means 6. Is applied, and is wound around the winder 7 at a predetermined speed.
[0031]
According to the above-described embodiment, in the humidity control device 4, the roll speed control device 17 according to the wet state and the running state of the unstretched film F that runs in the warm water of the hot water tank 11 via the guide rolls 12u and 12d. By adjusting the rotational speeds of the guide rolls 12u and 12d of each of the roll groups A to D, the unstretched film F can be run and sent out from the guide rolls 12u and 12d at an appropriate speed. As a result, meandering of the unstretched film F can be prevented and the generation of wrinkles can be prevented, and the variation in the width of the unstretched film F is small and stable sea humidity control is possible. Further, the four guide rolls 12u and 12d that are similar in behavior due to the moisture absorption speed of the unstretched film F in the humidity control device 4 are grouped into five roller groups A to D, and these roller groups are controlled by the roll speed control device 17. Since the rotation speed can be adjusted for each of A to D, the rotation speed can be easily controlled and the roll drive motors 16A to 16D for driving the guide rolls 12u and 12d can be compared with the case where the speed of the guide rolls 12u and 12d is adjusted individually. 16D can also be reduced, and the equipment cost can be reduced.
[0032]
Further, in the roll speed control device 17, the rotational speed of the guide rolls 12 u and 12 d is compared with the moving speed of the unstretched film F on the inlet side of the hot water tank 11 with respect to the unstretched film F that is stretched by humidity adjustment in the hot water tank 11. Since the moving speed on the outlet side is controlled within a range that does not exceed 5 mm / second, it is possible to prevent the unstretched film F from being pulled too much or too loose to break.
[0033]
Further, the end air sensor 24 detects the position of the end of the unstretched film F, and based on this detection signal, the meandering control device 27 drives the swing cylinder 29 to swing the adjustment rolls 14F and 14R. The lead-out position of the unstretched film F can be corrected. Therefore, wrinkling can be prevented by preventing meandering of the unstretched film F.
[0034]
Furthermore, the end air sensor 24 is an indirect type, and the contact piece 25b is brought into contact with the end of the unstretched film F via the swing link 25 so that the detection piece 25c provided on the swing link 25 is detected. Therefore, even if moisture is contained in the unstretched film F, the measurement accuracy is not lowered by the moisture.
[0035]
Although the flat simultaneous biaxial stretching machine 5 is used in the above embodiment, a flat sequential biaxial stretching apparatus or a tubular simultaneous biaxial stretching machine may be used.
[0036]
【The invention's effect】
As described above, according to the first aspect of the present invention, the end position of the unstretched film is detected by the end detection means, and the roll swing device is driven by the meandering control means based on this detection signal. By swinging the roll, the lead-out position of the unstretched film can be corrected. Therefore, meandering of the unstretched film can be prevented and stable humidity control is possible.
[0040]
According to the invention of claim 2, since the end of the unstretched film is indirectly detected by the air sensor via the swing link, even if moisture is contained in the unstretched film, malfunction due to moisture The end position of the unstretched film can be detected with high accuracy.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a humidity control apparatus showing an embodiment of a stretched film manufacturing facility according to the present invention.
FIG. 2 is a configuration diagram showing a roll driving device of a roll group of a tuned humidity device.
FIG. 3 is a plan view showing a derivation roll device of the tuned humidity device.
FIG. 4 is a rear view showing a derivation roll device of the tuned humidity device.
FIG. 5 is a configuration diagram showing an end air sensor of the tuned humidity device.
FIG. 6 is an overall configuration diagram showing the stretched film manufacturing facility.
[Explanation of symbols]
F Unstretched Films A to D First to Fourth Roll Group 1 Extruder 2 Die 3 Cooling Drum 4 Humidity Control Device 5 Stretching Machine 6 Heat Treatment Means 7 Winding Machine 11 Hot Water Tank 12u, 12d Guide Roll 13 Introducing Rolls 14F, 14R Adjustment rolls 16A to 16D Roll drive motor 17 Roll speed control devices 18A to 18D Rotary encoder 20 Derived roll device 22 Roller table 23 Shaft body 24 End air sensor 25 Swing link 25b Contact 25c Detection piece 26 Sensor unit 27 Meander control device 29 Swing cylinder

Claims (2)

A humidity control device for a stretched film manufacturing facility that introduces an unstretched film into a hot water tank and immerses it in hot water for a predetermined time and sends it to a stretching machine, and is adjusted by a roll swing device at the outlet of the hot water tank Provided is a derivation roll means capable of swinging the roll around an axis perpendicular to the film surface, and provided with an end detection means for detecting the end of the unstretched film led out from the hot water tank. A humidity control apparatus for a stretched film manufacturing facility, characterized in that meandering control means for adjusting the lead-out position of the unstretched film by operating the lead roll means based on the detection signal and swinging the adjusting roll is arranged .   The end position detecting means has a contactor whose input end is in contact with the end of the unstretched film, and a detection piece is attached to the output end so that it can swing around an axis parallel to the running direction of the unstretched film. And an air sensor unit that can detect the end of the unstretched film via the swing link by the air pressure of the detection air blown to the detection piece of the swing link. 2. A humidity control apparatus for a stretched film manufacturing facility according to claim 1,

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