JPH02106542A - Winding method for plastic film in slitter - Google Patents

Abstract

PURPOSE:To keep additive face pressure to a roll at optimum values and make it possible to allow the style of winding, hardness of winding to agree with desired values by controlling the face pressure in accordance with the change in pressure roll supporting angle depending on the width, pressure, weight, increase in roll-diameter, etc. of a film roll. CONSTITUTION:Each winding film roll 5 is driven and rotated by a motor 9, and for the motor 9 the driving torque is controlled by signals from an amplifier 10 to control winding tensile force. The winding tensile force is controlled by signals from an initial tension setting device 11 and signals from a tension control device 12 in accordance with the roll diameter or roll length of the roll 5. Control of output of an air cylinder 8 is performed by controlling the air pressure of the cylinder 8 by means of an electropneumatic converter 13, and control of the converter 13 is performed by signals from an air pressure setting device 14 and signals from an air pressure correcting device 15. Signals from a pressure roll-width setting device 17 and signals from a pressure roll- supporting angle detector 19 for detecting angle theta of a pressure roll supporting arm 18 are sent to the correcting device 15.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for winding a plastic film in a slitter, and in particular to a winding method for winding a film while applying surface pressure to each winding film roll with a contact pressure roll. Regarding the method of collection.

[Conventional technology] Conventionally, in plastic film slitters,
A plastic film winding method is known in which the film is wound while applying surface pressure to each winding film roll using a contact pressure roll. The contact pressure roll is pressed against the take-up film roll by a biasing means such as an air cylinder, and by optimally setting the surface pressure added to the take-up film due to the suppression, the take-up film roll is improved. −
It is known that it is possible to obtain the desired winding appearance and hardness.

[Problems to be Solved by the Invention] However, there are the following problems in winding the film through the pressure roll type slitter as described above.

First, there are problems caused by simultaneous winding of products of different widths. The slitter cuts a wide intermediate product into multiple strips of film according to each required width, and winds the strips of film into each take-up film roll (rolled product). When the widths are significantly different, there is a problem in that it is often difficult to simultaneously set the surface pressure of each winding film roll by the contact pressure roll to an optimum value. That is, each contact pressure used [21
- The roll is selected depending on the width of each winding film roll, but if the width of the winding film roll differs greatly, the roll length of the pressure roll also differs greatly, resulting in a large difference in the middle finger. Due to the surface pressure applying mechanism, the weight of the pressure roll often affects the surface pressure applied to the take-up film roll; for example, the weight component of the pressure roll reduces the pressing force by the urging means. When acting in a direction, the greater the weight of the pressure roll, the stronger the output of the urging means must be in order to cancel out the weight component and generate a predetermined surface pressure. Therefore, when winding narrow and wide film rolls at the same time, if the output of the biasing means is set for the narrow width film roll, the output of the biasing means for the wide width film roll becomes smaller. Too much, the surface pressure of the wide take-up roll is insufficient, causing winding misalignment, and conversely, when the output of the biasing means is adjusted to the wide take-up film roll,
The output of the biasing means for a narrow film roll becomes too large, and the surface pressure becomes too high, leading to excessively hard winding and quality defects due to hard winding. In order to prevent such problems from occurring, it is conceivable to manually set the output of each biasing means each time according to the width of each winding film roll, the roll length and weight of each contact pressure roll. However, it is difficult to adopt such a setting method in an actual production system because it requires complicated operations and makes delicate optimal settings difficult.

Further, the contact pressure roll is usually supported by an arm, and the biasing means is connected to the arm, and one part of the contact pressure roll white is connected to the arm.
Since the weight components of arms other than 41 affect the surface pressure, complex calculations are required to accurately set the generated surface pressure to the target surface pressure, and the output setting of the manual biasing means described above is not optimal. It is difficult.

Second, there is a problem regarding variations in the direction of application of surface pressure during winding. As the winding diameter of the film roll increases as the winding progresses, the support angle of the pressure roll changes and the component of the weight of the pressure roll in the direction in which surface pressure is applied also changes. In order to maintain a constant optimum surface pressure, it is necessary to compensate for this variation, but this compensation is difficult with mere manual setting as described above.

Additionally, a slitter is known in which the take-up film roll is released from the contact pressure roll according to the amount of roll thickness each time the take-up roll thickens by a certain amount, and the support angle of the contact pressure roll is maintained within a certain range. However, within the above-mentioned certain range, changes in surface pressure still occur. In general, when winding in a slitter, the winding core may be changed depending on the application of the slit product. The pressure application direction component changes and weight compensation problems arise.

An object of the present invention is to reduce the additional surface pressure on each film roll even when winding film rolls of different product widths are simultaneously wound and even when the support angle of the contact pressure roll changes during winding. The purpose of the present invention is to provide a winding method that can keep the winding roll at a constant optimum value and make the winding form and winding hardness of all winding rolls meet the target quality and hardness.

[Means for Solving the Problems] A method for winding a plastic film in a slitter of the present invention in accordance with this objective is to press a contact pressure roll on each take-up roll using a biasing means, and to apply pressure to each take-up roll by the contact pressure roll. In a method for winding a plus deck film in a slitter that winds the film while applying surface pressure to the film roll, the output of each of the biasing means is determined by the width of each winding roll, the weight of each pressure roll, and the limbs of the pressure roll. The method includes controlling the surface pressure applied to each film roll during winding to a predetermined optimum surface pressure by controlling the surface pressure according to the change in the surface pressure application direction component.

The biasing means is composed of, for example, an air cylinder, and the output (air pressure) of the air cylinder is controlled via a control device according to various input settings and change detection signals, so that the additional surface pressure is kept constant during winding. The target surface pressure is controlled to be the same.

In addition, in the pressure roll weight compensation control, the weight of the pressure roll support arm and the like is also compensated.

[Function] In such a winding method, the width and weight ω are individually adjusted for each winding film roll and each contact pressure roll.
Since the output of each biasing means is controlled so that the target surface pressure is applied to each take-up film roll, even when simultaneously winding different product widths, each take-up film roll The surface pressures of each are controlled to their optimum values.

In addition, even if the contact pressure roll support angle changes due to a change in the take-up core used or the roll thickness of the take-up film roll during winding, the output of the additional means is controlled to change every moment to follow the change. Therefore, the surface pressure on each winding film roll is always maintained at a constant optimum surface pressure even during winding.

[Example] Hereinafter, a preferred example of the method for winding up a plastic film in a slitter according to the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an example of the configuration of an apparatus used in the method of the present invention, and FIG. 3 shows the relationship between the take-up film roll and the contact pressure roll.

First, the configuration of the apparatus shown in FIGS. 1 and 2 will be explained. In the slitter 1 shown in FIG. 2, a plastic film 3 unwound from a wide intermediate product 2 is conveyed on each guide roll, cut into a predetermined width by a cutter 4, and then formed into each wound film roll 5. It is wound onto the core 6. Each winding film roll 5 is pressed by a contact pressure roll 7, and a predetermined surface pressure is applied to each winding film roll 5 during winding by an air cylinder 8 serving as a biasing means.

Each winding film roll 5 is rotationally driven by a motor 9, and the driving torque of the motor 9 is controlled by a signal from an amplifier 10. By controlling this drive torque, the winding tension is controlled. The winding tension is determined according to the signal from the initial tension setting device 11 and the winding diameter or winding length of the winding film roll 5, for example, a tension 1.0 that is programmed to gradually decrease the winding tension. (Controlled by signals from the II device 12.

The output of the air cylinder 8 is controlled by controlling the air pressure of the air cylinder 8 with an electro-pneumatic converter 13, and the electro-pneumatic converter 13 is controlled by a signal from the air pressure setting device 14 and air pressure correction. The signal from the amplifier 15 is transmitted through the amplifier 16. The air pressure corrector 15 receives a signal from a pressure roll width setting device 17 and a signal from a pressure roll support angle detector 19 that detects the angle O of the pressure roll support arm 18 with respect to the vertical line.

Using the above-mentioned device, the air pressure of the air cylinder 8 is controlled as follows so that the surface pressure exerted by the contact pressure roll 7 becomes a constant target optimal surface pressure.

In other words, as shown in Fig. 3, if the width (product width) of the winding film roll 5 is LP, and the roll length (roll surface length) of the contact pressure roll 7 used is 1°, the following equation is satisfied. controlled as follows.

x=1/(K△)(PXLP+ (LcXα+β)si
n θ) Here, X: Air cylinder air pressure (Kg/crit>
△: Effective pressure area in air cylinder <ci) P: Set surface pressure (Kg/m,) LP: Width of rolled product (m) Lo: Surface length of contact pressure roll
(TrL)α: unit weight per surface length of the contact pressure roll (ffg/m) β: weight correction of the support arm and contact pressure l of the contact pressure roll - bearing part (K3) θ: correction of the weight of the contact pressure roll To support angle: moment arm length ratio; ゑ1/i! 2 (Fig. 2) By performing such control, the weight 1 (L) of the contact pressure roll 7 including the support arm 18 and the bearing part weight correction valve β is
cxα) in the direction of surface pressure addition (L.

Compensation control of sin θ is performed, and based on this, the air cylinder output (X△) is controlled so that the target optimal surface pressure P (K!J/rrt> is achieved.This control is performed as follows: Since this is performed for each take-up film roll 5 and each contact pressure roll 7, even if film rolls 5 of different widths are wound at the same time, each take-up film roll 5 is controlled to the target surface pressure.

In addition, if the support angle θ of the pressure roll 7 changes during winding due to a change in the winding core 6 or an increase in the thickness of the film roll 5, the pressure roll support angle detector 1 detects the change momentarily.
9, and based on the signal, the compensation amount of the weight compensation valve (LCXα + β) sin θ is also variably controlled. Therefore, the air cylinder air pressure is controlled so that the generated surface pressure is always maintained at a constant target surface pressure even during winding.

This air pressure control is applicable to the following types of slitter when the support angle is approximately constant, when it changes only within a approximately constant range, or when it changes in one direction in proportion to the roll thickness. It is.

In the above embodiment, a single-acting air cylinder was used as the biasing means, but even if a double-acting air cylinder, a diaphragm-type air cylinder, or even other types of biasing means are used, the biasing force will not be the same. The present invention can be applied to any type of device as long as it can be controlled.

[Effects of the Invention] As explained above, when using the method for winding a plastic film in a slitter of the present invention, the width of the winding film roll, the weight of the contact pressure roll used, and the roll thickness are determined for each winding film roll. The surface pressure can be controlled according to changes in the contact pressure roll support angle due to etc., and this surface pressure can be used as the initial surface pressure and can be controlled to the desired optimum surface pressure at all times during winding. Even when winding the product width simultaneously, it is possible to maintain the optimum surface pressure for all winding rolls from the start of winding to the end of winding, and it is possible to obtain a good winding appearance and target winding hardness for all products. .

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a surface pressure control device for a slitter for carrying out a method according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the entire slitter shown in FIG. 1, and FIG. FIG. 2 is a perspective view of a winding film roll and a contact pressure roll. 1...Slitter 3...Plastic film 5.
・・・・・・・・・・・・Take-up film roll 6・・・・
...... Winding core 7 ...... Contact pressure roll 8 ...
・・・・・・Air cylinder 13・・・・・・・・・・・・
・Electro-pneumatic converter 14... Air pressure setting device 15... Air pressure corrector 16...
··········amplifier

Claims (1)

[Claims] 1. A plastic film winding method in a slitter in which a contact pressure roll is pressed against each take-up roll by a biasing means, and the film is wound while applying surface pressure to each take-up film roll by the contact pressure roll. The output of the force means is controlled in accordance with the width of each winding roll, the weight of each pressure roll, and the change in the component of the pressure roll weight in the direction of applying surface pressure. A method for winding a plastic film in a slitter, the method comprising controlling the surface pressure applied to the roll to a predetermined optimum surface pressure.