JP2000095401A - Film winding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability at beginning of winding a film by controlling to drive a take-over machine and a winding machine by the known quantities peculiar to the device and a time computed so as to equalize the sagging quantity of a film to the winding quantity. SOLUTION: The known quantities peculiar to the device are the letting-out speed V1 of a tenter 13, a time t1 until being wound on a winding machine 15, a time tc in which a take-over machine 14 moves the beginning end of a film up to the winding machine 15 at a speed Vc in the range of this time t1, a time t2 in which the winding machine 15 and the take-over machine 14 are accelerated from the stop state to a speed kV (k is a mutiplier) since the beginning end is wound on the winding machine 15, and a time t4 in which the winding machine 15 and the take-over machine 14 are decelerated to the same speed V1 as that of the tenter 13. A time t3 maintaining the speed kV1 is an unknown quantity, and it is obtained as a sagging quantity Ft=winding length Fw from formulas I, II. By the known quantities peculiar to the device and the t3, a control device 16 controls to drive drive motors 14a, 15a to be able to begin winding of the beginning end of the film by the winding machine 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a film winding method.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for producing a plastic film, a plastic material is melt-kneaded by an extruder, stretched longitudinally by a die, stretched transversely by a tenter, and wound by a take-up machine. Some are wound up by a taker.

[0003] In the operation of such a plastic film manufacturing apparatus, the starting end of the film coming out of the tenter is guided manually to the take-up machine by the operator while the belt-shaped film is continuously fed by the operation of the tenter, and furthermore, the winding is performed. Wrap around the machine. Thereafter, while visually observing the amount of film slack at the tenter exit side by the operator, the winding speed of the winder is manually controlled so that the slack is eliminated, and thus the winding speed of the winder is made equal to the speed of the tenter. To complete the winding start operation.

[0004]

However, the prior art has the following problems. That is, when the film fed from the tenter is wound on a winder as described above,
The width of the film is about 6 to 8m, the minimum speed of the tenter operation is as high as about 120m / min, and the operating speed of the winder until the amount of film slack in the section from the tenter to the take-up machine disappears. While the speed must be maintained at or above the speed of the tenter, the speed must be the same as the speed of the tenter at the moment when the amount of slack disappears and thereafter, and the film is made of a fragile material with a thickness of 10 to 25 μm. Therefore, a high degree of skill and cooperation by a plurality of operators is required.

[0005] In addition, even after entering a stable operation state, the strip-shaped film may be cut off due to unexpected factors. Depending on the type of film to be manufactured, the initial winding by an operator manually may be performed several times a day. Is being done.

SUMMARY OF THE INVENTION An object of the present invention is to improve workability of starting film winding in a section from a tenter outlet to a winding machine through a take-up machine in a film manufacturing process.

[0007]

According to the first aspect of the present invention, the starting end of a film unwound from a tenter is taken up by a take-up machine, and the start end of the film taken out by the take-up machine is started to be taken up by a take-up machine. in the film winding method for, and a film feeding speed of the tenter and V _t, the film after forming the starting end to cut up wound to the start end through a take-up machine winder of the film fed out from the tenter Time of t
_1, the time puller moves at a speed V _c the starting end of the film up winder within this time t ₁ and t _c, winder start of the film from the wound to the winding machine and The time when the take-up machine is accelerated from the stopped state to the speed kV _t (k is a constant) is t ₂ , and then the take-up machine and the take-up machine are operated at the speed k
T ₃ the time for maintaining the V _t, then the time winder and take-up device is made to decelerate to the same velocity V _t and tenter t
When the _4, the _{V t, V c, k,} t 1, t c, t
_2, t set ₄ as a known quantity, the film after forming the starting end to cut fed from tenter, winder for winding speed and puller take-up speed tenter the same speed V _t of
The slack amount F _t of tenter is feeding the film before it is set is calculated by the following equation (1), after forming the starting end by cutting a film fed from the tenter to the winding speed of the winder the winding length F _w of the film winder wound up take-up speed of the take-up device is set to the same speed V _t and the tenter is calculated by the following equation (2), F _t = F _w becomes t
₃ calculates the said known amount _{V t, V c, k,} t 1, t 2,
film winding method characterized by controlling the driving of the take-up machine and the winder by calculation amount t ₃ of t ₄ Toko.

[0008] _{F t = V t (t 1} + t 2 + t 3 + t 4) ... (1) F w = V c t c + kV t t 2/2 + kV t t 3 + (kV t + V t) t 4/2 … (2)

[0009]

After calculating the slack amount of the film unwound from the tenter, the winding speed of the winding machine and the winding speed of the take-up machine can be automatically controlled so that the slack amount is eliminated. Therefore, it is possible to quickly and reliably start winding the film without taking a long time to remove the sag of the film and without causing the film to break.

[0010]

FIG. 1 is a schematic diagram showing a film manufacturing apparatus, FIG. 2 is a velocity diagram showing a film winding control state, and FIG. 3 is a flowchart showing a film winding control procedure.

As shown in FIG. 1, a film production apparatus 10 melts and kneads a plastic material with an extruder 11, stretches this longitudinally with a die 12 to form a film 1, and horizontally stretches the film 1 with a tenter 13. After stretching, the winding machine 15 passes through a take-up machine 14 comprising a plurality of carrier rolls.
Is to be wound up.

However, in the section from the exit of the tenter 13 to the take-up machine 15 via the take-up machine 14, the control device 16 allows the film 1 continuously fed from the tenter 13 to be taken up without any slack in the same section. Like being wound up in fifteen
The drive motor 14A of the take-up machine 14 and the drive motor 1 of the take-up machine 15
5A is controlled as follows (FIG. 2).

[0013] First, upon control by the control unit 16, the film feeding speed of the tenter 13 and V _t. V _t is a known amount set in advance.

Also, the time from cutting the film 1 fed from the tenter 13 to form the start end thereof, passing the start end of the film 1 through the take-up machine 14 and winding (sticking) the film 1 on the winder 15. the t _1, the winder 1 a starting end of the film 1 winder 14 within this time t ₁ at a rate V _c
The time for moving to 5 is t _c (the moving distance f _c from the entry side of the take-up machine 14 to the winding machine 15). V _c is a known amount set in advance, t _c is a known amount calculated by V _c / f _c. t ₁ is an actual measurement value measured during the current film passing operation and is a known amount. In addition, work (time t) until the start end of cutting the film 1 is delivered to the take-up machine 14
_1a ) When the work (time t _1b ) until the start end of the film 1 discharged from the take-up machine 14 is wound around the take-up machine 15 by a robot or the like without manual operation, t _{1
Is, t 1 = t c + t} 1a + t 1b (t 1 a, t 1b known amount set in advance) a known amount calculated by the.

[0015] The speed kV _t (k winder 15 and take-up device 14 from a stopped state from the beginning of the film 1 is attached winder 15 wound is a constant and is selected for example from 1.2 to 2.0 ) t ₂ time induced to accelerated up, then, the time winder 15 and take-up device 14 to maintain the speed kV _t t _3, then winding machine 15 and take-up device 14 is tenter 13 at the same speed V _{t 4} time to decelerate to t
And k, t ₂ and t ₄ are known amounts set in advance. t ₃ is an unknown quantity and is calculated by the following calculation by the control device 16.

In order to determine t ₃ , the controller 16 cuts the film 1 fed from the tenter 13 to form the start end thereof according to the following equation (1), and then determines the winding speed of the winding machine 15 and with take-up speed of the take-up device 14 calculates the slack amount F _t of the tenter 13 is feeding the film 1 before it is set in the tenter 13 at the same speed V _t, the following equation (2), the film 1 fed out from the tenter 13 the cut after forming the starting end, the winder 15 until the take-up speed of the take-up speed and the take-up device 14 of the winding machine 15 is set to tenter 13 at the same speed V _t is wound film 1 for calculating the winding length F _w.

[0017] _{F t = V t (t 1} + t 2 + t 3 + t 4) ... (1) F w = V c t c + kV t t 2/2 + kV t t 3 + (kV t + V t) t 4/2 … (2)

Then, the control device 16 calculates the above equation (1)
(2) from equation, F _t = F _w, in other words need to continuously unwound film 1 from tenter 13 in a section of the outlet-winder 15 of the tenter 13 take slack without winder 15 wound if the a t ₃ is calculated by calculating the F _t = F _w.

The control device 16 controls the tenter 13 at the time when the slackening of the film 1 by the winding of the winding machine 15 is completed.
Of the film 1 in the section from the exit of the tenter 13 to the winding machine 15 or the exit of the tenter 13 to the winding machine 1
If it is desired to secure a tension state based on a certain shortage length [-L] in the film 1 in the section No. 5, t is calculated by the following equation (3).
₃ shall be calculated.

F _t ± L = F _w (3)

[0021] Thus, the control device 16, the aforementioned known amount _{V t, V c, k,} t 1, t 2, t 4 Toko amount of calculation t ₃
Drives the drive motor 14A of the take-up device 14 and the drive motor 15A of the take-up device 15 so that the start of the film 1 can be started by the take-up device 15.

Accordingly, the control device 16 starts winding the film 1 on the winder 15 in the following procedure (FIG. 3). (1) The operator cuts the film 1 at the exit of the tenter 13 and removes the slack removing operation switch 16A of the control device 16.
Is turned on at the same time as the start end, and connected to the take-off machine 14 to start the same. Control device 16
Is the same as (2) below except for the operator work in (3) below.
Perform (6) automatically.

(2) The controller 16 prepares for calculation of F _t and F _w .

(3) The controller 16 sets the take-up machine 14 to the time t _c.
Only then driven at a speed V _c, the film after beginning application of the winding shaft by the operator to start driving the winder 15 in the take-up acceleration alpha (acceleration take-up the puller 14 alpha). In the driving start timing of the winder 15, and that t ₁ is measured.

[0025] (4) The control device 16 is increased to set the winder 15 speed kV _t (e.g. 1.5V _t).

(5) The controller 16 calculates F _t and F _W. Then, F _t = F _w (or F _t ± L = F _w )
To calculate the t ₃ to.

[0027] (6) The controller 16, after t ₃ has elapsed after setting the winding speed of the winder 15 in kV _t, the winding speed of the winder 15 from the kV _t, winding deceleration β (Eg β = −
α) (the take-off machine 14 takes off at a deceleration β) for a time t ₄ . Thereby, the winding speed of the winding machine 15 (the winding machine 1
Take-up speed) V _w of 4 becomes the same as the feeding speed V _t of the tenter 13, the slack of the film 1 winder 15 fed out from the tenter 13 in a section of the outlet-winder 15 of the tenter 13 It winds up without accompanying.

Therefore, according to the present embodiment, the following operations are provided. After calculating the slack amount of the film 1 fed from the tenter 13, the winding speed of the winder 15 and the pulling speed of the puller 14 can be automatically controlled so that the slack amount is eliminated. Therefore, the winding of the film 1 can be started quickly and reliably without taking a long time to remove the slack of the film 1 and without causing the film 1 to break.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

[0030]

As described above, according to the present invention, in the film manufacturing process, the workability of starting film winding in the section from the exit of the tenter to the winding machine via the take-up machine can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a film manufacturing apparatus.

FIG. 2 is a velocity diagram showing a film winding control state.

FIG. 3 is a flowchart showing a film winding control procedure.

[Explanation of symbols]

 Reference Signs List 1 film 13 tenter 14 take-up machine 15 take-up machine 16 controller

Claims (1)

[Claims] 1. A film winding method in which a starter of a film unwound from a tenter is taken up by a take-up machine, and a start-up end of the film taken up by the take-up machine is started to be taken up by a winder. _t , the time from cutting the film unwound from the tenter to form the starting end thereof and passing the starting end of the film through the take-up machine and winding the film on the winding machine is t ₁ , and within the range of this time t ₁ the time puller moves beginning of the film at a speed V _c to the winder and t _c, the speed of the winder from the wound to the starting end winder of the film and take-up machine stopped kV _t ( k is the time induced to accelerated up to a constant) t _2, then the time winder and take-up device maintains the speed kV _t t _3, then winding machine and take-up device until the same speed V _t and tenter When the time is caused to decelerate and t ₄ The V _t, V _c, k, determined t _1, t _c, the t _2, t ₄ as a known quantity, the film after forming the starting end to cut fed from the tenter, the winding of the winder the slack amount F _t of tenter is feeding the film to the take-up speed of the speed and puller are set to the same speed V _t and the tenter is calculated by the following equation (1), the starting end to cut the film fed from the tenter after forming, following the winding length F _w of the film winder wound up take-up speed of the take-up speed and puller of the winding machine is set to the same velocity V _t and tenter (2 ) was calculated by the equation, F _t = F _w a becomes t ₃ calculated, the known amount V _t, V _c,
A film winding method characterized by controlling the drive of a winding machine and a winding machine based on k, t ₁ , t ₂ , t _{4 and} the calculated amount t ₃ . _{F t = V t (t 1} + t 2 + t 3 + t 4) ... (1) F w = V c t c + kV t t 2/2 + kV t t 3 + (kV t + V t) t 4/2 ... (2 )