JPS60128153A - Taking-up of slitter - Google Patents

Abstract

PURPOSE:To effectively prevent the formation of wrinkles on a rear-side product roll by keeping the pressing force of a press-contact roll before the bulging-out part of a taking-up core does not contact with a sheet article and keeping the air biting-in rate of a front-side product roll at a proper value. CONSTITUTION:The pressing force of a front-side product roll 2 for a press-contact roll 7 is kept at the pressure lower than a certain pressure P1 before the front-side product roll 2 forms the taken-up thickness t1 in which the bulging-out part 4 of the taking-up core 3 does not contact with the sheet article 8 taken-up onto a rear-side product roll 6. The control is performed by controlling a pressure control valve 14 by a controller 15 according to the signal supplied from a taking-up thickness detector 17. The certain pressure P1 is the pressure under which formation of wrinkles on the sheet article 8 starts, when the bulging-out part 4 of the taking-up core 3 contacts with the sheet article 8. No wrinkle is generated on the sheet article 8 until the taking-up thickness on the product roll 2 becomes the taking-up thickness t1 with which the bulging-out part 4 does not contact with the sheet article 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for winding up a sheet-like material in a slitter, and in particular, to changing the position of product rolls adjacent in the width direction of the sheet-like material back and forth in the feeding direction of the sheet-like material. Along with shifting the
The present invention relates to a slitter winding method for winding a plurality of product rolls while pressing them against a single common pressure roll.

BACKGROUND ART In winding a slitter of the type described above, when winding a product roll using a winding core having a width wider than the width of the cut sheet material, as shown in FIG. The protruding portion 4 of the winding core 3 from the product roll 2 on the front shaft 1 is wound onto the rear shaft 5 as a product roll 6 until the product roll 2 becomes thickened to a certain extent, and is brought into contact with the protruding portion 4 of the winding core 3. It comes into contact with the sheet-like material 8 conveyed on the pressure roll 7. In this way, at the beginning of winding the product roll, the protruding portion 4 of the winding core 3 of the front shaft 1 is attached to the sheet-like material 8 of the rear shaft 5.
If you step on it, the product roll 6 wound up by the rear shaft 5 may get wrinkled. Wrinkling is particularly likely to occur when the product roll 2 is pressed against the contact pressure roll 7 under high pressure production conditions or when the sheet-like material is a thin film. If wrinkles occur, it will have an adverse effect not only on the core of the product roll 6 where the wrinkles have occurred, but also on the part that is wound onto the upper layer, and there is a risk that the product roll 6 wound on the rear shaft 5 will eventually be rejected. There is a problem that there is.

OBJECTS OF THE INVENTION The present invention aims to prevent the occurrence of wrinkles under the above-mentioned winding conditions and improve the product acceptance rate.

Structure of the Invention In order to achieve this object, the present invention has the following structure. That is, the slitter winding method of the present invention is as follows:
When cutting a sheet-like material and winding it up as product rolls around a plurality of winding cores, the positions of adjacent product rolls in the width direction of the sheet-like material are shifted back and forth in the sheet-like material feeding direction. In a slitter winding method in which a product roll is wound while being pressed against a common pressure roll, when the product roll is wound using a winding core whose width is wider than the width of the cut sheet-like material. , the product roll on the front side when viewed in the feeding direction of the sheet-like material is such that a portion of the winding core of the product roll protruding from the end surface of the product roll is conveyed on the contact pressure roll of this portion, and the product roll is transported in the feeding direction of the sheet-like material. The pressing force from the end surface of the front product roll is applied to the pressure roll side of the front product roll until the thickness of the roll is such that it does not contact the sheet material to be wound up as the rear product roll. Even if the protruding portion of the take-up core comes into contact with the sheet-like material to be wound up as a product roll on the rear side, the pressure is kept low enough to prevent wrinkles from forming on the sheet-like material.

In such a winding method, the pressing force of the front product roll on the contact pressure roll is limited to the amount that the protruding part of the winding core is in contact with the sheet material to be wound on the rear product roll. The pressure is kept low enough to prevent wrinkles. In general, the pressing force of the product roll against the pressure roll is set so that the amount of air trapped between the winding layers of the product roll is an appropriate amount. This air entrapment increases as the winding speed increases, so in order to suppress the air entrapment rate to an appropriate level, the higher the winding speed, the higher the suppressing force is required.

However, the protruding part of the winding core comes into contact with the sheet material only at the beginning of winding until the product roll has thickened by a certain amount, and during that time, the winding speed has not yet increased to the normal speed. range and low speed range. therefore,
Even for sheet-like materials that require a considerably high pressing force after the normal speed increase, it is possible to achieve a predetermined air entrainment rate with a low pressing force at low speeds at the beginning of winding. By keeping this low pressing force at an appropriately low pressure that does not cause wrinkles in the sheet material even when the winding core comes into contact with it, the predetermined air entrainment rate of the front product roll is maintained while the rear product roll The appearance of wrinkles is prevented.

Effects of the Invention Therefore, even in the case of winding conditions in which the winding core is wider than the width of the product roll, the winding of the rear product roll can be carried out while maintaining an appropriate air entrainment ratio of the front product roll. It is possible to prevent the occurrence of wrinkles, obtain a good winding appearance for both the front product roll and the rear product roll, and improve the product acceptance rate.

EXAMPLES Below, preferred examples of the slitter winding method of the present invention will be described with reference to the drawings.

FIG. 2 shows a winding section of a slitter for carrying out a method according to an embodiment of the invention.

The positional relationship between the product roll and the contact pressure roll is similar to that shown in FIG. That is, the product roll 2 on the front shaft 1 and the product roll 6 on the rear shaft 5 are connected to the contact pressure roll 7.
At the top, the positions are shifted from each other back and forth in the feeding direction of the sheet-like material 9. Therefore, the winding core 3 of the front product roll 2
The protruding portion 4 comes into contact with the cut sheet material 8 to be wound onto the rear product roll 6 at the beginning of winding. In addition,
The sheet-like material 9 is cut by a plurality of cutters 10 arranged in the width direction of the sheet-like material 9, and the cut sheet-like materials are wound up as a front product roll 2 and a rear product roll 6, respectively.

In FIG. 2, the winding core 3 is attached to the winding arm 11 and is rotationally driven by a suitable drive device (not shown). The winding arm 11 is urged toward the pressure roll 7 during winding by a double-acting cylinder 12 as a pressing means, so that the winding core 3 or the product roll 2.6 is pushed against the pressure roll 7.
is pressed in the directions shown by arrows A and B. The operation of the cylinder 12 on the front shaft 1 side is controlled by controlling the pressure of air sent from an air source 13 by a pressure control valve 14, and by controlling the air pressure, the cylinder 12 is connected to the winding core 3 or the product roll 2. The pressing force on the contact pressure roller 6 is controlled.

Pressure control valve 14 is controlled by a signal from control device 15. The product roll 2 is placed at the pivot point 16 of the take-up arm 11 by detecting the pivot angle of the take-up arm 11.
A winding thickness detection device 17 for detecting the winding thickness is connected to the winding thickness detecting device 17, and a detection signal from the winding thickness sensing device 17 is sent to the control device 15.

Note that the winding thickness and detection device 17 is not limited to the one in this embodiment, and may be, for example, a device that directly detects the winding thickness of the product roll 2, or a relationship between the degree of increase in winding speed from the start of winding and the winding thickness. A device that detects the winding thickness based on the winding speed, or a device that detects the winding thickness based on the winding speed, or a device that detects the relationship between the winding time from the start of winding and the winding thickness in advance, and detects the winding thickness based on the winding time. It may also be a device designed to detect the temperature. Further, the means for pressing the winding core 3 or the class 6 roll 2.6 against the contact pressure roll 7 is not limited to the cylinder device of this embodiment, but may be any suitable means.

Further, in this embodiment, the control device 15 is used to automatically control the pressing force with respect to the winding thickness, but the pressing force may be controlled manually.

Using the apparatus configured as described above, the method of the present invention is carried out as follows.

As shown in FIG. The pressure is maintained at a low pressure below a certain pressure P1 until the winding thickness tl reaches a value that does not make contact with the object 8. This control is performed by controlling the pressure control valve 14 by the control device 15 based on a signal from the winding thickness detection device 17. This constant pressure P1 is the pressure at which wrinkles begin to appear in the sheet-like material 8 when the protruding portion 4 of the winding core 3 comes into contact with the sheet-like material 8.

Therefore, the pressing force of the product roll 2 is maintained at a low pressure that does not cause wrinkles until the product roll 2 has a thickness that does not allow the protruding portion 4 to come into contact with the sheet material 8. . This pressure P1 is the surface hardness of the contact pressure roll 7,
It is determined by the coefficient of friction, the coefficient of friction of the sheet material 9, etc.

By the way, when the sheet-like material 9 is a polyester film, the film thickness is 11!, which is about 2μ to 50μ. The pressing force P1 is 30b in the width direction of the sheet-like material 9.
/n+, and wrinkles will not form if the pressing force is 30 kg/m or less. In addition, in Fig. 3, from the start of winding until the winding thickness tl is reached, if the pressing force is less than P1, any appropriate control curve as shown by the chain double-dashed line in addition to the one shown by the solid line can be used. good.

While this pressing force is kept at a low pressure, that is, until the protruding portion 4 does not come into contact with the sheet-like material 8, the winding speed has not yet increased significantly from the beginning of winding.
This is a low speed area.

Therefore, even if the pressing force of the product roll 2 is controlled to a low pressure, it is possible to appropriately control the air entrapment layer of the front product roll 2. That is, the rear product roll 6 is prevented from wrinkling while maintaining the air entrainment rate of the front product roll 2 at an appropriate value.

After the product roll 2 is rolled to a thickness of 11 or more, the problem of wrinkles on the rear product roll 6 disappears, so the pressing force P2 is controlled under the normal conditions, and the winding speed is kept at a certain value or higher or when steady winding is performed. After reaching the take-up speed, the air entrainment rate of the product roll 2 is controlled by a pressing force P2 that is appropriately set in advance.

Therefore, while maintaining a good winding appearance of the front product roll 2 without adversely affecting the air entrainment rate of the front product roll 2, the sheet material to be wound as the rear product roll 6 and the winding of the front product roll 2 are It is possible to prevent the occurrence of wrinkles due to contact with the protruding portion 4 of the core, and it is possible to obtain the effect that the acceptance rate of products in the slitter can be improved.

In addition, in the method according to the present invention, a more effective effect was obtained when the protruding length k of the protruding portion 4 of the winding core 3 was 11111 or more, and an even more effective effect was particularly obtained when it was 3n+m or more.

[Brief explanation of drawings]

Fig. 1 is a partial perspective view of a winding section of a slitter that winds up a product roll while pressing it against a common pressure roll, and Fig. 2 shows an apparatus for carrying out a method according to an embodiment of the present invention. The side view and Figure 3 are relationship diagrams between pressing force and winding thickness. 1... Front shaft 2... Front product roll 3... Winding core 4... Protruding portion of winding core 5... Back Shaft 6...Rear product roll 7...Contact pressure roll 8...Sheet-like material 9...Sheet-like material wound on the rear product roll 11... Winding arm 12... Cylinder 14 as a pressing means...
... Pressure control valve 15 ... Control device 17 ... Winding thickness detection device Pl ... Pressure P2 at which wrinkles start to appear ... Normal winding Pressure t1 at speed...
...The winding thickness that prevents the protruding part of the winding core from coming into contact with the sheet material.

Claims (1)

[Claims] (1) When cutting a sheet-like material and winding it up as a product roll around a plurality of winding cores, the positions of adjacent product rolls in the middle of the sheet-like material are shifted back and forth in the sheet-like material feeding direction, In a slitter winding method in which multiple product rolls are rolled while being pressed against a common pressure roll, the product rolls are wound using a winding core whose width is wider than the width of the cut sheet material. When the product roll on the front side as seen in the feeding direction of the sheet-like material, a portion of the winding core of the product roll protruding from the end surface of the product roll is transported on the contact pressure roll of the portion, and the product roll is conveyed in the feeding direction of the sheet-like material. The end face of the front product roll is pressed against the contact pressure side of the front product roll until it reaches a thickness that does not make contact with the sheet material to be wound up as the rear product roll. Even if the protruding portion of the winding core comes into contact with the sheet-like material to be wound up as a product roll on the rear side, the sheet-like material will be wrinkled. A slitter winding method characterized by keeping the pressure as low as possible.