JPS62167326A - Slip preventive treatment apparatus for beltlike material such as film or the like - Google Patents

Abstract

PURPOSE:A treatment apparatus, having facing narrow ship preventive treatment device provided on both selvedges of a beltlike material, e.g. film, etc., in extru sion molding thereof and capable of subjecting only both selvedges to slip preven tive treatment and winding the beltlike material without losing high slipperiness and weaving. CONSTITUTION:In an extrusion molding apparatus for molding a beltlike mate rial 11, e.g. plastic film or sheet, etc. high frequency and high voltage are applied from a high-frequency generator 1 to narrow discharge electrodes 15 provided to face only both selvedges of the above-mentioned beltlike material 11 to generate corona discharge between the discharge electrodes 15 and treating rolls 7. Thereby corona discharge treatment is applied to narrow corona treating parts (A) (20-50mm width) of both selvedges of the running beltlike material 11 to smoothly wind the beltlike material 11 with fine unevennesses on the surface into a roll form while preventing slip without causing weaving. Similar results are also obtained by a method, e.g. plasma discharge, printer coating, mechanical stamping, etc., other than the corona discharge.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a slip prevention treatment device for a belt-shaped object such as a plastic film or sheet.

(Prior Art) FIGS. 3 and 4 show, as an example, a conventional corona discharge treatment apparatus for film surfaces.

The processing device will be mainly explained below.

In the figure, 1 is a high frequency generator, which generates high frequency
Generates high voltage, typically 20 to 6 volts in one generator
0KV, frequency 5~ll0KH.

It has a capacity with an output of about 1 to 20 kW.

The high frequency generator 1 is connected to a wide discharge electrode 4 via a high voltage cable. The high voltage cable 2 is inserted into a shield pipe 3, and the shield vibe 3 weakens the strength of the high frequency electric field generated by the high voltage cable 2 to prevent external radio interference.

The wide discharge electrode 4 is an electrode that generates high frequency and high voltage, and generates a corona treatment discharge between the discharge electrode 4 and the roll 7 through the film 11 between the treatment rolls 7 and the film 1.
1 is held by an electrode holder 5 over its entire width.

Reference numeral 6 denotes an adjustment screw, which is provided to adjust the gap between the discharge electrode 4 and the processing roll 7, and generally a plurality of adjustment screws are attached. The gap is usually adjusted within the range of 1 to 3 cranes.

A plurality of treatment rolls 7 are arranged in a staggered manner in the width direction of the film 11 in the running direction of the film 11, and are used to apply corona treatment to the film 11 between the discharge electrode 4 and guide the film. A rubber material is used to prevent static electricity. Therefore, the film 11 moves on these rotating processing rolls 7. Further, a plurality of the discharge electrodes 4 are installed corresponding to the number of processing rolls 7.

Guide rolls 8 are disposed before and after these processing rolls 7, and the guide rolls 8 are drive rolls for feeding the film 11 to the processing rolls 7, and the surfaces thereof are generally chrome-plated. An ozone exhaust duct 9 sucks ozone generated in the air during corona treatment, and the ozone is exhausted to the outside by an ozone exhaust blower 10.

The processing roll 7 is driven by a drive motor (not shown) via a speed reducer, a belt, and a processing roll driving pulley 12. Reference numeral 13 denotes a bearing for driving the processing roll, which supports the roll shaft.

By the way, plastic films or sheets generally have the following characteristics: a) low specific gravity b) excellent transparency C9 high surface hardness d) excellent heat resistance e) excellent automatic packaging f. It has many features such as good moisture resistance, and has a wide range of uses including light packaging.

However, since the surface is smooth and inactive, it has poor adhesion and paintability, and has the disadvantage that sufficient performance cannot be obtained unless some treatment is performed.

For this reason, various types of processing have been performed to modify the surface, but the typical surface modification methods include:
Methods include a) mixing special additives into the resin, b) primer coating, c) plasma discharge treatment, and d) corona discharge treatment.

The corona discharge treatment described above as a conventional example is the most common and widely used of these.

Since the surface of corona discharge-treated film or sheet strips is finely uneven, even when wound into a roll, the friction between the films or sheets becomes large, and weak tension or pressure is applied. No misalignment occurs even when winding.

On the other hand, for strips such as films for which transparency is very important, such as those used for albums, tapes, textile packaging, and special food packaging, the surface is usually not subjected to corona treatment.

Furthermore, special films for X-rays and photographs are generally not subjected to corona treatment, etc., because surface V-smoothness is very important.

Due to the smoothness of the surface of these strips, such as films or sheets, whose surfaces are not specially treated, they tend to become misaligned when wound into a roll, and there are many cases in which they cannot be transported as a product.

In this way, when strips such as films or sheets shift during winding, scratches often occur on the surfaces of the strips that come into contact with each other.

(Problems to be Solved by the Invention) As mentioned above, when a band-shaped object such as a film or sheet has an inert and smooth surface that does not cause unevenness, when it is wound into a roll, the surface is too smooth. It was easy to cause winding misalignment during winding.

Therefore, when winding into a roll, if you try to wind it under high tension or high pressure (high contact pressure) to prevent winding misalignment,
Due to aging, strips such as films and sheets shrink, making them unusable as products.

Therefore, in many cases, the winding diameter is reduced (generally 800 ~
Even if the winding is normal with a 1000φ position, it is 600~
They are operating in such a way that they can only wrap around 800φ, resulting in poor productivity.

In addition, attempts have been made to oscillate the entire winding machine to vary the thickness as needed to prevent winding misalignment, but in this case the equipment becomes expensive and is not practical in terms of cost. The current situation is that it is difficult to

The present invention has been made to solve these problems, and is a process for surface-treating a film or sheet so that it can be wound at high speed without losing its high smoothness and without causing any slippage. The aim is to provide equipment.

(Means for Solving the Problems) Therefore, the present invention provides an extrusion molding apparatus for forming a strip-shaped object such as a plastic film or sheet, in which a narrow sliding device is installed opposite both side edges of the strip-shaped object. The present invention provides a slip prevention treatment device for a strip such as a film, which is equipped with a prevention treatment device and performs slip prevention treatment only on both side edges of the strip, and is intended to solve the above-mentioned problems. be.

(Function) When winding up a strip such as a film or sheet that cannot be subjected to surface treatment that requires a high degree of surface smoothness and transparency, the edges of both sides of the strip such as the film or sheet are Anti-slip treatment such as corona treatment is performed only in the range of 20 to 50 ta.

A strip-shaped object such as a film or sheet that has been subjected to the same treatment has an increased friction coefficient only on both side edges, and can be smoothly wound into a roll without causing any misalignment during subsequent winding.
A high-quality product can be obtained without losing any characteristics such as smoothness or transparency in the main part of the rolled-up band-like material such as a film or sheet.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 and 2 show a corona discharge treatment device which is an embodiment of the anti-slip device according to the present invention. A film is taken as an example of the strip-shaped object to be processed.

In the figure, 1 is a high frequency generator, 2 is a high voltage cable, 3 is a shield pipe, 5 is an electrode holder, 6 is an adjustment screw, 7 is a corona treatment roll, 8 is a guide roll, 9 is an ozone exhaust duct, and 11 is a film , 12 is a pulley for driving the processing roll, and 13 is a bearing for driving the processing roll, and each of the above members is the same as the part marked with an asterisk in the conventional processing apparatus shown in FIGS. 3 and 4.

Therefore, their description will be omitted here, and the description will focus on the features of this embodiment below.

Reference numeral 15 denotes a narrow discharge electrode, which is installed facing only both side edges of the film 11 and is used for corona discharge treatment, and its width is configured to be 20 m or more and 50 m or less,
The gap with the processing roll 7 is adjusted from 1 to 3 by adjusting the adjustment screw 6.
It is adjusted to about m. The film 11, which has been subjected to corona discharge treatment only on both side edges, is wound into a roll by a winder 16.

Δ is 20 mm on both sides of the film 11 in the corona discharge treatment section.
This is a portion that was subjected to corona discharge treatment with a width of ~50M.

According to the anti-slip treatment device according to this embodiment having the above-described configuration, a high frequency and a high voltage are applied to the narrow discharge electrode 15 from the high frequency generator 1 in a regular manner and intermittently.
Corona discharge is generated between the processing roll 7 and the processing roll 7. At this time, corona discharge treatment is performed on both side edges of the film 11 running between the discharge electrode 15 and the treatment roll 7, each having a width of about 20 to 50 fi.

As a result of this treatment, corona discharge treated areas A with a finely uneven surface are formed on both sides of the film 11, and since the same treated areas are used during winding in the subsequent process, slippage is prevented and miswinding occurs. It can be smoothly wound into a roll without any problems.

As mentioned above, it is the film 11 that undergoes the corona discharge treatment.
Because it is only a small portion of both side edges, no deterioration occurs in the parts that require high smoothness and transparency as a product, and only a small portion is lost due to processing.

In addition, for strip-shaped objects such as films or sheets that should avoid scratches on the surface as much as possible, we can similarly apply corona discharge treatment to only the surfaces on both sides and create fine irregularities on the treated surface. To prevent the occurrence of scratches by eliminating rubbing between strips.

Note that the surface to be subjected to the corona discharge treatment can be treated by adding a narrow discharge electrode 17 as shown by the two-dot chain line in FIG. It is possible to select whether to treat only the upper surface or the lower surface, or to treat both the upper and lower surfaces at the same time, and these selections are made as appropriate depending on the characteristics of the strip.

The width of the part to be subjected to the corona discharge treatment is determined to be an appropriate width within the range of 20 m or more and 50 m or less, taking into consideration the characteristics of the strip, the winding diameter, winding conditions, operating speed, etc. It is.

In the above explanation, treatment by corona discharge was introduced, but other than corona discharge treatment, such as plasma discharge,
A similar effect can be expected with methods such as applying a brimer or mechanically marking.

In addition, regarding the gap between the discharge electrode 4 and the processing roll 7, the selection of the value 1 to 3 is determined by the characteristics of the strip, the twist index of the treated surface, the winding diameter, the winding conditions, the product width, the product thickness, This is determined based on the driving speed, etc.

Note that, in the present invention, the shape of the discharge electrode is not particularly limited, and the strip-shaped object to be treated is not particularly limited to plastics (for example, paper, etc. are also covered).

<Effects of the Invention> As described above in detail, according to the present invention, slippage between the strips such as films or sheets is prevented by subjecting only the surfaces of both side edges of the strips to anti-slip treatment using corona discharge or the like. This prevents the winding of the strip from occurring when it is wound into a roll, prevents damage due to slipping between the strips, and provides a product of stable quality.

Further, according to the present invention, since slippage between the strips can be prevented, high-speed, large-diameter winding becomes possible, and productivity can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a corona discharge treatment section according to an embodiment of the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is a side sectional view of a conventional corona discharge treatment section. , FIG. 4 is a view taken along the line IV-IV in FIG. 3. Explanation of main parts of the figure 1 - High frequency generator 7 - Processing roll 15 - Narrow discharge electrode A - Corona (discharge) processing section

Claims (1)

[Claims] In an extrusion molding device that molds a strip of plastic film or sheet, etc., a narrow slip prevention treatment device is provided opposite both edges of the strip to prevent slipping only on both edges of the strip. A slip prevention treatment device for strip-shaped materials such as films, characterized by applying a prevention treatment.