JPS60252559A - Slitting method of film - Google Patents

Abstract

PURPOSE:To allow stable slitting by slitting a film after expanding it in the axial direction with an expansion roller. CONSTITUTION:An original film 2 released from a wide original roll 1 is guided to an expansion roller 7 and is expanded in the width direction to remove wrinkles or shrinkage. A nip roller 8 is provided directly behind the expansion roller 7 to pinch the original film directly after it is expanded, the film from which wrinkles or shrinkage are removed is once fixed in this condition, then it is shifted to a slitting unit 9. Narrow films thus slit are individually tension- controlled by winding devices 10 and wound into film rolls. Accordingly, tension mottles in the width direction are eliminated, thus allowing stable slitting of the film.

Description

Detailed Description of the Invention: a. Field of Industrial Application The present invention relates to a film slitting method, and more specifically, to an improvement of a slitting method in which a raw film such as a synthetic resin film is cut and wound into a plurality of narrow film rolls. Regarding.

b6 Purpose of the Invention Conventionally, when slitting synthetic resin films such as polyester films, the tension was controlled while unwinding the film from a wide roll of raw material and transporting it with rollers, etc.
In addition, the film is expanded in its width direction using a curved roller that rotates around a curved axis called an expander, or a device called a flat expander that uses the expansion and contraction of special rubber on a horizontal roll surface, and then the desired slit width is formed. Judgment is being done.

However, this method has the problem that the film is not sufficiently widened and the width of the cut film varies. On the other hand, in recent years, a method has been proposed in which the tension of each cut film is individually controlled when winding thin films that are difficult to roll up, or films that are easy or non-slip. There is a problem in that a movement occurs in the running tension and it is difficult to control the winding tension.

The present invention provides a slitting method that solves these problems.

C0 Structure 1 of the Invention The present invention provides a film slitting method in which a wide raw film is cut and wound into a plurality of narrow film rolls, in which the film is It is characterized by cutting the film after nipping it over the entire width of the welded film expanded in the width direction.

This will be explained in detail below.

The figure is a simplified side view of an example of a slitting device for carrying out the method of the present invention. After passing through .6, expansion roller 7
The material is guided by the material and expanded in its width direction to remove wrinkles and shrinkage. As the expansion roller 7, any expansion roller such as a curved rotating roller or a flat expander that utilizes rubber expansion and contraction can be used as described above. 8 is expansion roller 7
It is a nip roller installed immediately after the Ic roller whose surface is lined with rubber, and the raw film immediately after being expanded is held between the Ic rollers, and the film from which wrinkles and shrinkage have been removed is fixedly covered in that state for 10 days. It is transferred to the cutting section 9 which is the next process. The cutting section 9 consists of a cutting roller 9a, a cutter 9b, etc.
Cut the original film into multiple narrow films. The cut narrow-width film is wound into a film roll by a winding device 10 provided individually for each film, with the tension angle controlled for each film.

The illustrated winding device consists of a kite roller 10a, a tudge roller 10b held by a lever, and a winding core 10d held between two arms 10C and rotationally driven.
The tension of the narrow film 11 wound around each core 10d is individually controlled and wound into a film roll.

d1 Effects of the invention In the present invention, immediately after the original film is expanded with an expansion roller, the entire width of the film is once nipped and cut, which eliminates tension irregularities in the width direction and stabilizes the cutting width of the film. , stable cutting is possible, and the tension of each narrow-width film after cutting is constant and stable.Especially when controlling the tension of each narrow-width film to perform precise winding, the tension of each film can be adjusted. The sixth point is that fluctuations in the winding speed are reduced, contributing to stable roll winding.

It is most preferable to nip immediately after the expansion of the film, but it is possible to add guide rollers or other processing that does not impair the expansion effect, and the nip should be carried out as soon as possible after nipping. It is preferable to cut it.

In the above explanation, the winding of the film, that is, the winding of the film into a roll, was explained in the case of individual winding using tension control. However, the method of the present invention is not limited to this winding method, and can be applied to other winding methods. It is also useful in the case of

[Brief explanation of the drawing]

The figure is a simplified side view of an example of a slitting device for carrying out the method of the invention. 7 is an expansion roller, 8 is a nip roller, and 9 is a cutting section.

Claims (1)

[Scope of Claims] 1. Film sliving 1 to d5 in which a wide original film is cut and rolled into a plurality of narrow film rolls, and the film is rolled in the width direction by an expansion roller during transport of the original film. A method for slitting a film, which comprises expanding the film, nipping the film across its entire width, and then cutting the film. 2. The film slitting method according to claim 1, in which the bonded cut film obtained by cutting the original film is wound onto a roll while individually controlling the tension of the bonded cut film.