JPH0532372A - Protective film laminator device with tension control mechanism - Google Patents

Abstract

PURPOSE:To prevent a protective film applied to the surface of a painted steel plate from lifting at the end in the shearing work. CONSTITUTION:In a laminator device having a protective film 1 applied to the surface of a painted steel plate X, the circumferential speed of a film unwinding roll 2 and film applying roll 3 is measured by a device for reading the circumferential speed of the roller. While the circumferential speed of both rolls 2, 3 is controlled to equalize the circumferential speed of these rolls to each other by a circumferential speed controller for the roll, the back tension of the protective film 1 unwound from a protective film coil 10 is detected by a tension measuring device so that the unwinding speed of the coil 10 is controlled by an unwinding speed controller not to produce the fluctuation of the tension.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective film laminator device having a tension control mechanism for sticking a protective film on the surface of a coated steel sheet.

[0002]

2. Description of the Related Art A protective film is usually attached to the surface of a coated steel sheet in order to prevent handling flaws and press flaws during pressing. FIG. 2 shows a conventional structure of a protective film laminator device therefor.

Of these, X is a coated steel plate, and 10 is a protective film coil. The protective film laminator device protects the surface of the coated steel plate X from the protective film coil 10 through the film rewinding roll 2 and the film laminating roll 3. The film 1 is attached. In addition, 7 in the figure
Is a bridle roll that gives tension to the coated surface of the coated steel sheet X, 8 is a flying shear that cuts the coated steel sheet X having the film attached to an appropriate length, and 9 is the last winding of the coated steel sheet X. It is a tension reel.

[0004]

In the above-mentioned protective film laminator device, the protective film coil 10 is protected by the film rewinding roll 2 and the film laminating roll 3 between the protective film coil 10 and the actual application on the surface of the coated steel sheet X. Laminate back tension is applied to the film 1 to continuously attach the protective film 1.

However, when the laminating back tension is excessively high or the tension at the time of laminating the film becomes uneven in the laminating direction (longitudinal direction of the steel plate), it is rewound by the uncoiler in the subsequent shearing process. When the product is sheared by a shear and left for a while, the protective film 1 floats (hatched portion) at the end of the steel sheet X in the longitudinal direction as shown in FIG.

As a result, when a user who purchases the product performs press molding or the like, a surface defect such as a press flaw occurs on the surface of the coating film, resulting in a defective product.

Therefore, when such floating of the end portion occurs, the work of re-coloring and the hand-pasting of the film are performed, which is a problem in terms of productivity and yield.

The present invention was devised in view of the above problems of the prior art. By adding a tension control mechanism to the protective film laminator device, the protective film floats at the end of the steel sheet during shearing. It is intended to prevent this.

[0009]

Therefore, in the protective film laminator device of the present invention, a roll peripheral speed reading device for measuring roll peripheral speed is installed on each of the film rewinding roll and the film sticking roll, and the roll peripheral speed of these rolls is measured. A roll peripheral speed control device for controlling these roll peripheral speeds so that both values match from the speed measurement value is provided, and a tension measuring device for detecting the back tension tension of the protective film rewound from the protective film coil is provided. Set up,
In addition, a basic feature is that a rewinding speed control device for controlling the coil rewinding speed is provided so that the detected tension value is always constant.

The process leading up to the creation of such a device configuration of the present invention will be described in detail below.

The inventors of the present invention first examined the cause of the floating of the protective film at the end of the coated steel sheet.
As a result, the phenomenon of floating of the film is roughly divided into 2
We have found that there are two causes.

One of them is that the laminating back tension of the protective film 1 becomes excessive due to the different roll peripheral speeds of the film rewinding roll 2 and the film sticking roll 3 shown in FIG. .. That is, when the peripheral speed of the film sticking roll 3 is higher than the peripheral speed of the film rewinding roll 2, the laminate back tension becomes high and the protective film 1 stretches in the width direction (shrinks in the length direction). Become. When the film 1 is attached to the coated surface of the steel plate X as it is, after a while, the film 1 is oppositely applied with a force to shrink in the width direction.
As a result, as shown in FIG. 3, during the shearing process, the floating of the film 1 occurs at the end of the steel sheet X in the longitudinal direction (hatched portion). (Indicated by) becomes wider.

Another cause is that the back tension tension gradually increases as the protective film coil 10 is rewound. That is, as shown in FIG. 4, if the revolving speed (rewinding speed) of the rewinding reel 11 of the coil 10 is constant, the film unwinding speed A (peripheral speed) at the rewinding start point a where the coil diameter is large is set. ,
The speed B at the rewinding end point b where the coil diameter becomes small
And A> B, the back tension tension gradually increases as the coil is rewound, and the extension of the protective film 1 in the width direction also increases accordingly. Therefore, after a certain time after the film is attached, the force of shrinking is exerted more toward the coil rewinding end end side, so that the film 1 floats closer to the steel plate X longitudinal rear end (coil rewinding end) side during shearing. Becomes noticeable.

From the above elucidation of the cause, it is a key to solve the above-mentioned problems that the roll revolving speed of the film rewinding roll is the same as that of the film pasting roll, and that the back tension tension fluctuation due to the coil rewinding is suppressed.

In the present invention, the roll peripheral speeds of both rolls are made equal, and a roll peripheral speed reading device is installed on each roll, and the peripheral speeds of the two rolls are set so that the peripheral speeds of these rolls coincide with each other. It shall be controlled by the peripheral speed control device, and on the other hand, a tension measuring device that detects the back tension tension of the protective film rewound from the coil shall be installed as a structure to suppress the fluctuation of back tension tension due to coil rewinding. The coil rewinding speed is controlled by the rewinding speed control device so that is always constant (this is a structure in which the film feeding speed from the coil is constant).

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory view showing an outline of a protective film laminator device to which the constitution of the present invention is applied. In the figure, X is a coated steel plate that passes through the bridle roll 7,
The state before being wound on the tension reel 9 is shown. On the way, the protective film 1 is attached by the laminator device of the present embodiment, and is cut by the flying shear 8 when it is wound into an appropriate length.

The laminator device of this embodiment has a structure in which the protective film 1 is first attached to the surface of the coated steel sheet X through the film rewinding roll 2 and the film attaching roll 3 from the protective film coil 10. Is the same as the conventional one.

In the present embodiment, roll peripheral speed reading devices 4 and 5 consisting of pulse generators are provided at the shaft ends of both rolls 2 and 3, while both rolls 2 and 3 are based on the input of these measured values. A roll peripheral speed control device (not shown) is installed to control the current supplied to the drive device (not shown). The roll peripheral speed control device controls the film rewinding roll 2 and the film sticking roll 3 so that the roll peripheral speed reading devices 4 and 5 measure and input the measured roll peripheral speed values.
Is controlled (actually, the roll peripheral speed of the pasting roll 3 should be determined and the peripheral speed of the rewinding roll 2 should be matched).

Further, the roll 6 is rolled on the surface of the protective film 1 rewound from the protective film coil 10, and at this time, the pressure applied to the shaft end portion of the roll 6 is detected to detect the back tension tension. A tension measuring device (not shown) for performing the measurement is provided, and a rewinding speed control device (not shown) for controlling the supply current to the reel driving device (not shown) of the coil 10 based on the input of the detected tension value. ) Is installed. The rewinding speed control device stores the initially detected tension detection value, and controls the coil rewinding speed so as to return to the first detection value when the detection value fluctuates (rewinding). At the start, the rewind speed may be brake-controlled, and the control may be loosened as the rewind progresses).

The following Table 1 shows the case where each control by the roll peripheral speed control device and the rewinding speed control device is performed in the above-described embodiment configuration (example of the present invention) and not performed (conventional example).
Each roll peripheral speed measurement value of the film rewinding roll 2 and the film pasting roll 3 and the starting point of coil rewinding (outer diameter)
And the back tension tension measurement value at the end point (inner diameter).

[0021]

[Table 1]

As is clear from the table, the roll peripheral speeds of the film rewinding roll 2 and the film laminating roll 3 are controlled to the same speed by the control of both control devices of this embodiment, and the back speed at the time of coil rewinding is controlled. Tension tension no longer fluctuates. As a result, when the steel sheet X was sheared after the film was attached, as shown in Table 2 below, the floating of the film at the steel sheet edge hardly occurred (product steel sheet length L Is shown as a percentage of the sum of the one-side length l ₁ and the other-end length l ₂ in the steel plate length direction of the floating occurrence region at the end).

[0023]

[Table 2]

[0024]

According to the protective film laminator device of the present invention described in detail above, it becomes possible to prevent the film from floating at the end portion during the shearing process of the product having the protective film attached to the surface of the coated steel sheet. It becomes possible to prevent the occurrence of flaws during press molding and the like. Therefore, the work of re-coloring and hand-pasting the film, which were performed when the film floats at the end portion, become unnecessary, which is also useful for improving productivity and yield.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an outline of a configuration of an embodiment of the present invention.

FIG. 2 is a schematic explanatory diagram of a configuration of a conventional protective film laminator device.

FIG. 3 is a plan view showing a floating state of the protective film generated at both ends in the longitudinal direction of the coated steel sheet during shearing.

FIG. 4 is an explanatory diagram showing a rewinding start state and a rewinding end state of a protective film rewound from a coil.

[Explanation of symbols]

 1 Protective film 2 Film rewinding roll 3 Film pasting roll 4,5 Roll peripheral speed reading device 6 Roll 7 Bridle roll 8 Flying shear 9 Tension reel 10 Protective film coil X Painted steel plate

Claims (1)

Claims: 1. A protective film laminator device for applying a protective film from a protective film coil through a film rewinding roll and a film attaching roll to a surface of a coated steel sheet, and measures roll peripheral speeds for both rolls. A roll peripheral speed control device for setting a roll peripheral speed reading device and controlling the peripheral speeds of these rolls so that both values match from the measured values of these roll peripheral speeds, and a protective film rewound from the coil. On the other hand, a tension control mechanism equipped with a tension measuring device for detecting the back tension tension and equipped with a rewinding speed control device for controlling the coil rewinding speed so that the detected tension value is always constant. Film laminator device.