KR800000310B1 - Film winding method - Google Patents

Abstract

Methods of winding synthetic resin films were described. During the winding of the film with a mill roll, the method by which a driving roll just in front of the mill roll was positioned and the driving roll speed higher than the film speed was maintained gave a good result.

Description

How to wind film

The figure shows the positional relationship of each roll in the film winding apparatus used at the time of implementing this invention.

The present invention relates to a method of winding a synthetic resin film, and an object thereof is to prevent wrinkles from entering a film rolled up on a mill roll.

In general, the synthetic resin film is stretched and then wound in a cylindrical core to form a so-called wheat wool. That is because it is wound up in a roll shape. At this time, if the wrinkles are partially in the way, it will not only adversely affect the rolled up and overlapping films in turn, but will also cause cross-sectional rolling in which both edges are inconsistent, resulting in a poor product.

This phenomenon does not appear much on thick films that have high stiffness, that is, films having a thickness of 25 μ or more, but tends to be much thinner than this, especially films of 12 μ or less, so that it is easy to wind up without wrinkles. It wasn't. It is pointed out that wrinkles occur during winding, such as the running speed of the film, the winding tension, the pressing pressure of the rolling roll, and the present inventors, in particular, examines the winding tension in depth and various rolls. In the process of researching the effect of wrinkles on creases by varying the tension to fabrication, I learned a significant fact. In the conventional winding method, the roll of the mill roller roll wound up is a free rotation roll, so even if the roll resistance is changed in various ways as well as the quality and surface condition of the roll, that is, the tension can be adjusted in various ways. It was found that it is impossible to fundamentally eliminate the occurrence of wrinkles caused by the torsional phenomena caused by tension in the longitudinal direction and the widthwise direction. If the tension of the film can be reduced to about the same speed as the traveling speed of the film or faster than the traveling speed of the film, that is, between the driving roller and the wheat roll, the tension may be reduced at all. It is in condition that the phenomenon is about to appear In other words, the researchers found that it can fundamentally eliminate the causes of wrinkles.

Conventionally, in order to prevent the cross-section rolling from occurring in the rolled up mill, it is natural to wind it up tightly, and it has been actually performed by adjusting the pressing force and adjusting the winding tension. The tight winding means that no extra air is inserted between the film and the film, and therefore, it is necessary to have a certain size, whether it is pressure or winding tension.

However, in recent years, the quality of the synthetic resin film, especially the polyester film, and the quality improvement of the quality is urgently required. In addition, even a very thin film of 3μ or 6μ is in demand, but it is good as a conventional winding method. The quality of wheat could hardly be obtained.

Therefore, there is a need for a new winding method that can solve this problem. Thus, as described above, the present invention opens up the prospect of industrially producing extremely thin films.

This invention makes the summary the film winding method characterized by arrange | positioning a driving roller just before a mill roll, and winding this driving roller while rotating to the running direction of a film.

Hereinafter, the present invention will be described in detail with reference to Examples.

The drawings below show the arrangement of each roll in the film winding apparatus used in the practice of the present invention, in which (1) is a film, (2) is a freely rotating roll, and (3) is a driving roll.

The film 1 travels through the freely rotating roll 2 and the driving roll 3 in the direction of the arrow to form a mill roll 5 on the winding core 6. (4) is a press roll, and a suitable press force is applied to the mill roll (5).

[Experiment 1]

(1) Experimental conditions

end. Driving roller

OD 210mm, forced surface

Hard after processing with easy

Chrome plated

Surface roughness 16S

I. Pressure

3kg tapered

All. Speed

60 m / min, 90 m / min.

la. Type of film

Polyethylene Terephthalate Film

Polyethylene 2, 6 naphthalate film

Polypropylene film

hemp. Film thickness

2μ, 5μ, 6μ, 8μ, 10μ

bar. Width of film

190 cm

four. Main speed 30-120m / min

(2) The appearance of the pillow 5 was inspected to evaluate the following three steps. In other words,

A: No wrinkles at all.

B: There are some wrinkles, but it can be a product.

C: The thing which becomes a defective product because there are many wrinkles.

(3) Experiment result

As shown in the first table.

[Table 1]

[Experiment 2]

(1) Experimental conditions

Of the experimental conditions of Experiment 1, only the driving roller was changed as follows. In other words,

Driving roll, outer diameter 210mm, forced.

Surface mirror

Hard chrome plating.

Surface roughness 0.3S.

(2) Experiment result

As shown in the second table.

[Table 2]

[Experiment 3]

(1) Experimental conditions

end. Driving roller

Outer diameter 210mm nitrile rubber

Rubber Shredder Hardness 75 °

I. Pressure

2.5kg tapered

All. Traveling speed

60m / min

la. Type of film

Polyethylene Terephthalate Film

Polyethylene 2, 6 naphthalate film

hemp. Film thickness

2μ, 5μ, 6μ, 8μ.

bar. Width of film

190 cm

four. Driving speed

40-70m / min

(2) Experiment result

It is as shown in Table 3.

[Table 3]

As is clear from the experiment results shown in Tables 1 to 3, when the driving roller is forced and the surface is easy machined and hard chromium plated, the main speed is at least as constant as the running speed of the film. However, in the case of nitrile rubber, the friction coefficient is large, and if it is less than the traveling speed of the film, no mill can be produced.

Moreover, in the case of easy and mirror surface, the range of the circumferential speed at which easy is an evaluation A becomes wider.

Either way, it is obvious that the wrinkles are removed by providing a driving roll in the mill roll operation and actively rotating it in the film running direction.

And if the main speed of the driving roller exceeds the running speed of the film, there is a problem where the upper limit is placed, but this is prescribed according to the material of the driving roller and its surface condition. Can not.

However, the main speed may be more than twice the film traveling speed if the surface is a metal-driven roller. It can be said that the driving roller made of nitrile rubber is not so fast.

Claims (1)

A method of winding up a film, wherein, when the film is wound and wound on a mill roll, a driving roll is disposed immediately before the mill roll, and the driving roll is wound while being rapidly rotated beyond the traveling speed toward the traveling direction of the film.

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