JPH0751413B2 - Film transport device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a film transporting device for transporting a flexible film while vacuum-sucking it onto a surface thereof, and particularly to a constant speed and constant tension without sliding on a roll. The present invention relates to a film transport device suitable for a film transport roll transported below.

(2) Configuration of conventional example and its problems Many transport rolls are used in polymer transporting devices such as a polymer film processing device, a film coater, a film inspecting device, and a film winding device. ,
2. Description of the Related Art Conventionally, a mirror-like roll has been used which has been coated with hard chrome or the like in order to prevent the roll surface shape from being transferred to a conveyed film or scratching the film.

And, where the tension difference between the front and rear of the transfer roll is large, the angle of wrapping around the transfer roll is small, the friction between the roll and the film is small, and there is a possibility that slippage will occur. A suction type transfer roll is used.

However, when the film is very smooth in this conventional transport roll or the film has low rigidity, and the film adheres to the vicinity of the vacuum suction hole, the vacuum atmosphere is limited to only around the vacuum suction hole, There was a problem that the desired film gripping force could not be obtained because the film did not spread over the entire area between the rolls.

(3) Object of the invention The present invention has been made in view of the above circumstances, and in the above-described film transport and the like, particularly when a film gripping force is required, the film is gripped stably by vacuum suction without slipping. An object of the present invention is to provide a film transport device for transporting.

(4) Structure of the Invention The above object is achieved by the present invention described below. That is, according to the present invention, in a conveying device that conveys a flexible film while suctioning it to the surface by vacuum suction, an exhaust groove that is not closed by suction of the flexible film communicating with the vacuum suction hole around the vacuum suction hole on the surface. Is provided, and air between the surface between the vacuum suction holes and the flexible film is exhausted.

As described above, in the present invention, since the exhaust groove which is not closed by the suction of the flexible film is arranged around the vacuum suction hole, the vacuum suction hole may be completely closed by the sucked film as in the conventional case. Therefore, a large gripping force as expected can be obtained, and at the same time, the exhaust groove is not closed by the flexible film.In other words, it is a minute item that does not suck the flexible film into the exhaust film, so that the conveyed film is not damaged. It can be transported without giving.

The present invention described above is particularly preferably applicable to the film transport rolls described below, but it is apparent from that point that it is also applicable to other robot hands and the like.

Hereinafter, the details of the present invention will be described with reference to the above-described film transport roll.

FIG. 1 is a partial cross-sectional view showing the structure of the transport roll of the embodiment.

1 in the drawing is a vacuum suction hole provided in the roll body 10, 2 is an exhaust pipe for maintaining a vacuum inside the transfer roll, 3 is a rotary seal for maintaining airtightness, and this basic structure is a conventional suction type transfer. Same as roll.

4 is an exhaust groove according to the present invention as long as it communicates with the vacuum suction port 1 as described above and is not closed by suction of the flexible film. It is preferable from the standpoint of gripping force and the like to dispose all over the entire area. The exhaust groove 4 preferably has a large cross-sectional area in the range in which it is not closed by the sucked flexible film from the exhaust surface, but a narrow width is preferable in terms of transfer to the film and damage. The groove shape and arrangement are determined by the rigidity of the target film and the necessary gripping force,
Must be determined experimentally.

In particular, for a polymer film that is difficult to handle and is likely to cause transfer and a functional polymer film having a functional film formed thereon, it is preferable that the exhaust groove has a minute groove width that does not cause transfer. The groove width varies depending on the gripping force and the rigidity of the film as described above, but by setting it to 100 μm or less, the occurrence of transfer is prevented under practical conditions even in the above polymer film having a film thickness of 200 μm or less.

From the above points and the point of easiness of groove processing, as the exhaust groove 4, it is preferable to use a groove portion of a pear-shaped rough surface whose surface is smoothed, which will be described later, and a mesh crack obtained by electrolytically etching hard chrome plating. . Among them, the pear-like rough surface has a surface roughness of 1S to 10S, and the mesh crack has a groove width of 8 μm or more and the groove density is the width of the roll surface.
About 1 to 10 per 0.1 mm is preferably used because it can be widely applied in the gripping force surface and the film damage surface for the conveyance of the polymer film.

Hereinafter, the evaluation result of the gripping force of the specific example of the exhaust groove 4 will be described.

The gripping force was measured for each example of each exhaust groove by the gripping force evaluation method shown in FIG.

In FIG. 2, 101 is a suction box having an evaluation sample mounted on the upper surface thereof, and the inside is evacuated by a suction blower 102. Sample plate 10 with various exhaust grooves
3 is set in the suction box 101, the flexible film 104 is placed thereon, and one end of the flexible film 104 is connected to the tensiometer 105. Exhaust is adjusted with the vacuum valve 106, and the degree of vacuum, that is, the scale is kept constant with the vacuum gauge 107, the tension meter 105 is pulled, and the tension at the point where the film 104 is displaced on the sample plate 103 is measured. The grip force was evaluated. The sample plate evaluated is shown in FIG.

The result obtained by changing the thickness of the flexible film 104 is
Shown in the figure. The gripping force in the figure is the measured value of the tensiometer. A polyethylene terephthalate (PET) film was used for the flexible film 104.

It can be seen from FIG. 4 that the conventional mirror surface cannot be expected to have a large gripping force for a polymer film having a thickness of 175 μm or less.

On the other hand, in the embodiment provided with the exhaust groove, the gripping force is several times or more that of the conventional example. In particular, a large gripping force is obtained in a thinner film, and it is understood that it is particularly effective for a polymer film of 200 μm or less. Above all, an exhaust groove formed by a rough rough surface having a surface smoothed by polishing has a large gripping force and is preferable. In each of the examples, the transfer of the surface shape of the sample plate to the flexible film was not generated in the above evaluations.

Therefore, a desired film transport roll can be obtained by selecting the above-mentioned exhaust groove in consideration of the influence of scratches, etc. on the film at the time of slip, the ease of processing, and the maintainability.

(5) Effect of the Invention As described above, according to the present invention, the exhaust groove is provided around the vacuum suction hole so as to communicate with the vacuum suction port, and the reduced pressure state is effectively spread over the entire area between the film to be conveyed and the grip surface. Can hold the film. In particular, it is suitable for a high-speed transport roll whose gripping force is reduced by the accompanying airflow, and a vertical transport roll for vertically transporting a film whose influence of gravity cannot be ignored.

[Brief description of drawings]

FIG. 1 is an explanatory view of a vacuum suction type transfer roll of an embodiment, FIG. 2 is an explanatory view of a gripping force test device, FIG. 3 is a characteristic list of test samples, and FIG. 4 is a gripping force measurement of each sample. It is a graph which shows a result. 10: Roll body, 1: Vacuum suction port 4: Exhaust groove, 101: Suction box 103: Sample plate, 105: Tensiometer

Claims (8)

[Claims] 1. A transport device for transporting a flexible film while suctioning it to a surface by vacuum suction, and an exhaust groove which is not closed by suction of a flexible film communicating with the vacuum suction hole around the vacuum suction hole on the surface. Is provided so that air between the surface between the vacuum suction holes and the flexible film is exhausted, and the exhaust groove has a groove width that does not cause transfer to the flexible film by suction. Is a groove width of 100 μm or less, and the exhaust groove is a groove having a rough surface with a surface roughness of 1S to 10S. 2. The film transport device according to claim 1, wherein the transport device is a transport roller. 3. The film according to claim 1, wherein the flexible film is a polymer film or a flexible polymer film in which a functional film is laminated on the polymer film. Transport device. 4. The film transporting device according to claim 1, wherein the film thickness of the flexible film is 10 to 200 μm. 5. A transport device for transporting a flexible film while suctioning it to a surface by vacuum suction, and an exhaust groove around the vacuum suction hole on the surface which is not closed by suction of the flexible film communicating with the vacuum suction hole. Is provided so that air between the surface between the vacuum suction holes and the flexible film is exhausted, and the exhaust groove has a groove width that does not cause transfer to the flexible film by suction. Is a groove width of 100 μm or less, and the exhaust groove is a mesh crack obtained by electrolytically etching hard chrome plating. 6. The film transport device according to claim 5, wherein the transport device is a transport roller. 7. The film according to any one of claims 5 to 6, wherein the flexible film is a polymer film or a flexible polymer film obtained by laminating a functional film on a polymer film. Transport device. 8. The film transporting device according to claim 5, wherein the flexible film has a film thickness of 10 to 200 μm.