JPS5947703B2 - Film or sheet surface treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film or sheet surface treatment apparatus.

More specifically, surface-treated films or sheets,
It is an object of the present invention to provide a surface treatment device that provides improved flatness and rolled appearance. Conventionally, surface treatments such as corona discharge treatment, flame treatment, etc. are known in order to improve the adhesion of films or sheets.

When a film or sheet that has been subjected to such surface treatment is rolled up into a roll, the appearance of the roll deteriorates compared to when a film or sheet that has not been surface-treated is rolled up, and the film or sheet also suffers from scratches, wrinkles, unevenness, etc. The flatness of the film or sheet surface tends to deteriorate. For example, as shown in FIG. 1, irregularities of approximately 1-10 wrm may occur on the surface of a rolled film or sheet roll. When the film is unwound from such a roll, the portions of the film corresponding to the irregularities are deformed, wrinkled and scratched, and do not return to a perfectly flat surface.
Such deterioration in the winding appearance and flatness of the film or sheet is conventionally thought to be due to the blocking property, that is, the increase in the coefficient of friction, which accompanies the improvement of adhesion through surface treatment, and is unavoidable. It has been considered a thing. As a result of intensive research aimed at improving this quality deterioration of films or sheets, the present inventor found that most of this quality deterioration is due to deposits (reactants and deterioration caused by the treatment) that occur during surface treatment. The deposits accumulate on the surface of the transfer roll (hereinafter referred to as the roll) that comes into contact with the surface-treated surface of the film or sheet, and this may damage the film surface or damage the roll. In order to prevent this, the surface-treated surface of the film or sheet may be peeled off little by little, adhere to the film, and be rolled up in the roll of the film or sheet, deteriorating the quality as described above. The inventors have discovered that it is sufficient to remove the deposits from the roll surface and keep it clean at all times, and have arrived at the present invention.

That is, the present invention provides a film or sheet surface treatment apparatus that performs surface treatment such as corona discharge treatment or flame treatment. This is a film or sheet surface treatment apparatus characterized in that a roll surface cleaning tool is provided on a transfer roll that comes into contact with the surface-treated surface of the film or sheet after surface treatment. Although any film or sheet may be used for the surface treatment in the present invention, a film or sheet made by Netsumachi Plastics is preferably used.

In particular, the present invention provides aromatic linear polyesters such as terephthalate polyesters, naphthalate polyesters, etc.
It is particularly effective for surface treatment of films or sheets made of polyethylene terephthalate, polyethylene naphthalate, etc. Examples of the surface treatment in the present invention include corona discharge treatment, flame treatment, plasma treatment, and combination methods of two or more of these. Corona discharge treatment is most effective for improving the adhesion of aromatic linear polyester films or sheets.

A further advantage is that the treatment can be carried out continuously. In the surface treatment apparatus of the present invention, a roll surface cleaner is provided on the roll that comes into contact with the surface-treated surface of the film or sheet.

The roll surface cleaning device may be provided on all rolls that come into contact with the surface-treated surface of the film or sheet, but it is not necessary, and in some cases, the device may be provided on only one roll. It's okay. In that case, it is most effective to provide it on the roll that the surface-treated surface comes into contact with first. Usually, it is preferable to provide it on 1 to 3 of the rolls that come into contact with the surface-treated surfaces immediately after the surface treatment. One such example is shown in FIG.

In the example of FIG. 2, a raw film 1 to be surface-treated passes between processing stations 2 and 3, the side of the film indicated by the dashed line being treated, and is wound through rolls 4, 5 and 6. taken. Among these rolls, rolls 4 and 6 are the rolls that come into contact with the surface-treated surface of the film. The rolls 4 and 6 are each provided with a roll surface cleaning tool T. Regarding the treatment section, if the surface treatment is corona discharge treatment, treatment section 2 is an electrode roll coated with an insulator.
The processing section 3 is a conductive electrode, and when a high frequency power source is connected to 2 and 3, corona discharge occurs in the gap between 2 and 3, and since the film is in close contact with the electrode roll 2, the film The surface of the electrode 3 facing the electrode 3 is surface-treated. In addition, in the case of flame treatment, the treatment section 2 is a water-cooled roll,
Flame is blown from the processing section 3 toward the water-cooled roll 2, and since the film is in close contact with the water-cooled roll 2, the surface of the film facing the processing section 3 is surface-treated. Roll Surface Cleaning Tool 19 Any method may be used as long as it can remove the deposits on the surface of the roll without getting it wrapped around the film.

Specific examples thereof are shown in FIGS. 3 to 6. In the example in Figure 3,
Remove any deposits by scrubbing the surface of the roll with a brush and applying suction.

The surface-treated surface of the film 11 is in contact with the roll 12. A brush 14 rubs the surface of the roll, and air is sucked through the brush in the direction of the exhaust passage 13. The brush 14 is preferably provided on the side opposite to the surface of the roll 12 that is in contact with the film. Brush 14 is roll 1
It is not necessary that the entire surface of the contact area with 2 be uniformly flocked,
Partially flocked hair may be used as long as the deposits can be removed by rubbing the surface of the roll that comes into contact with the film. Figure 4a-
Figure e shows a row of brushes 14 used as a Rono K surface cleaning tool, and the figure shows the shape seen from the roll side of the device.

In the examples shown in Figures 4a-e, the length direction of the cleaning tool (horizontal direction in the figure) is parallel to the axial direction of the roll of the device.
Install cleaning tools. The roll surface of the device is then rotated from the top to the bottom of FIG. 4 a-e while being rubbed by the cleaning tool. In addition, in FIGS. 4a to 4e, each shaded area 14 is a part where the hair is flocked, and the ends of the flocked hair rub the surface of the roll. 1
Reference numeral 3 denotes an exhaust passage, 15 a depressurizing passage for guiding air to the exhaust passage 13 at a part recessed one step further than the outer edge of the brush, and 16 an outer edge without flocking.

Although only one or two exhaust passages 13 are shown in Figures 4a to 4e, the number of exhaust passages provided is 1.
Needless to say, any number may be used as long as it is greater than the value. The one shown in FIG. 4a is one in which hairs are implanted on the outer edge.

Instead of planting hair on the outer edge, the hair may be planted in a similar shape to a portion of the decompression passage 15 adjacent to the outer edge. The one shown in FIG. 4b is an example in which the left and right ends of the outer edge, which are not so important for cleaning the mouth surface, are not flocked.

The one shown in FIG. 4c is an example in which hairs are implanted only in the front part of the outer edge.

The one shown in FIG. 4(d) has a shape similar to the one shown in FIG. 4(c) arranged vertically to form l sets, and has a great cleaning effect.

Although two exhaust passages 13 are shown in the figure, more exhaust passages 13 may be provided. Even if only one exhaust passage 13 is provided, the usable force and cleaning effect are somewhat reduced. Figure 4e
The one shown in FIG. 1 is an example in which the entire surface, except for the exhaust passage 13, is flocked.

In this case, both the outer edge and the decompression passage are flocked, but it goes without saying that it is also possible to use one in which the outer edge is not flocked. In all of the cleaning tools exemplified above, in order to maintain a reduced pressure that allows the decompression passage 15 to sufficiently suction the deposits on the roll surface, the outer edge is removed as much as possible so as not to create a large gap between the outer edge and the roll surface. Preferably it is kept close to the surface of the roll. Furthermore, instead of flocking, a layer of woven or knitted fabric, or a layer of non-woven fabric may be provided. In the example shown in FIG. 5, the roll surface is rubbed with the doctor knife 24, and air is sucked from around (or before and after) the doctor knife 24 toward the exhaust passage 23.

Instead of using a doctor knife, a strong blade-shaped air stream may be applied (air knife). In that case as well, air is sucked in the direction 3 from around the air knife (or from the front and back). In any of the above methods, as shown in FIG. 6, while the roll surface cleaning tool 31 (the air suction tube is omitted because it is shown schematically in FIG. 6) is brought into contact with the roll 32, the roll 32 is removed.
A method of vibrating in the axial direction (direction indicated by the arrow in FIG. 6) is preferable because it can effectively remove deposits.

Using the apparatus of the present invention not only significantly improves the winding appearance of a surface-treated film or sheet, but also significantly reduces scratches, wrinkles, irregularities, etc. on the film or sheet, and improves its flatness. There is. The present invention will be explained in detail below using specific examples.

Example 1 and Comparative Example 1 A biaxially stretched polyethylene terephthalate film having a thickness of 25 μm and a width of 500 Fm was subjected to a corona discharge treatment.

That is, a corona discharge treatment was installed immediately after the unwinding shaft of an NS type FE-11B slitter (manufactured by K.K. Nishimura Seisakusho), and the film was coated with the insulator of the corona discharge treatment device from the unwinding shaft. After passing through the electrode roll (corresponding to the processing section 2 in Fig. 2), the film was wound up through the normal path of this slitter. At this time, the blade for slitting the film was not used at all. After corona discharge treatment The first roll (corresponding to roll 4 in Figure 2) and the second roll (corresponding to roll 6 in Figure 2) that contact the surface-treated side of the film have a roll surface of the type shown in Figure 4d. A cleaning tool was attached.In the end, the film was passed through the same route as shown in Fig. 2 except that it was wound through six more rolls after roll 6 in Fig. 2.The film winding conditions were as follows:
-The hardness of the film roll (length 2000m roll) measured with a spring-type rubber hardness meter specified in K63Ol is 9
It remained constant at 0. The length of the roll surface cleaning tool in the roll axis direction is approximately 60cm, and the brush bristles are 10Wr1 in width.
Densely flocked with n.

The exhaust passage of this cleaning tool was connected to a proer with a displacement of 15 d/h, and suction was carried out. In the embodiment of the present invention, during the surface treatment of the film, the cleaning tool is always shaken with a width of 10 mm in the direction of the roll axis.
rfrIfL, it was oscillated with a period of 10 seconds. The film roll has a width of 500Wr1n. Judgment was made based on the appearance of the roll when a film with a length of 2000 m was wound.

The appearance of the roll was graded as follows based on the number of irregularities with a major diameter of 1 m or more as shown in FIG. Grades 1 and 2 are acceptable for use in photographs and magnetic tapes, while grades 3 and below cannot be used for these purposes because the unwound film has poor flatness.

The results are shown in Table 1. Experimental Black 1 does not perform any surface treatment on the film, and therefore does not require cleaning the surface of the roll. Experiments 2 to 4 are cases in which the film was subjected to corona discharge treatment, but the surface of the roll was not cleaned. Experimental blacks 5 to 8 are cases in which the film was subjected to corona discharge treatment and the surfaces of both of the rolls were cleaned. Experimental shops 9 to 11 performed corona discharge treatment on the film, and the surface of only roll 10 (corresponding to roll 4 in FIG. 2) of the rolls was cleaned. The degree of corona discharge treatment was such that the contact angle with water on the surface-treated surface of the film was 42° C. (the contact angle with water on the untreated surface was 69° C.).
). From the above results, if the surface of the roll is not cleaned during surface treatment, the wound film will have many unevenness and its flatness will not be good, and if it is continuously wound, the flatness will rapidly deteriorate further. However, it can be seen that these defects can be significantly improved by cleaning the surface.

Example 2 and Comparative Example 2 IC. Biaxially oriented polyethylene with a thickness of 25μ and a width of 500wr1n.
Example 1 except using 2,6-naphthalate film
The film was subjected to corona discharge treatment in the same manner as described above.

The degree of corona discharge treatment was such that the contact angle with water on the surface-treated surface of the film was 44° (the contact angle with water on the untreated surface was 70°).
The grading of the film roll (film roll grading) is as follows:
The same criteria as in Example 1 and Comparative Example 1 were used. The results are shown in Table 2.

In Experiment ▲1, the surface of the film was not treated, and therefore cleaning of the surface of the roll was not necessary. Experiments 2 and 3 were conducted in which the film was subjected to corona discharge treatment, but the surface of the roll was not cleaned. Also experiment ▲4~
7 performs corona discharge treatment on the film, and the roll 2
This is the case when cleaning the individual surfaces.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an example of the appearance of a raw fabric roll with poor winding appearance.

Claims (1)

[Claims] 1. In a film or sheet surface treatment device that performs surface treatment such as corona discharge treatment or flame treatment, a roll surface cleaning tool is provided on the roll that comes into contact with the surface-treated surface of the film or sheet after the surface treatment of the film or sheet. A film or sheet surface treatment device characterized by: