JPS63267648A - Film transport apparatus - Google Patents

Abstract

PURPOSE:To improve the gripping force by disposing a ventilation material having a lot of air holes in three dimensions on vacuum suction holes of a vacuum suction transport roll to put the whole area of a gripping surface for a transported film in a decompressed condition. CONSTITUTION:A ventilation material 4 having a lot of communicating holes 6 in three dimensions is disposed on vacuum suction holes 1 of a transport roll body 5 in such a manner that the communicating holes 6 communicate with the vacuum suction holes 1. Though in respect of exhaust, it is favorable for the communicating holes to have a large sectional area as far as they are not closed by a sucked flexible film, in respect of transfer to a film and damage thereof, it is favorable to have a small sectional area. In this respect, it is favorable that the ventilation material 4 is sintered metal having particle size of an equivalent diameter of less than 300mum or non-woven cloth having METSUKE of 20-300g/m<2> and a thickness of less than 1mm. Thus, decompressed condition is extended over the whole area between a transported film and the gripping surface so as to increase gripping force.

Description

Detailed Description of the Invention (1) Industrial Application Field The present invention relates to a film conveying device that conveys a flexible film while vacuum suctioning the surface thereof, and in particular, the present invention relates to a film conveying device that conveys a flexible film while vacuum suctioning the surface thereof. The present invention relates to a film transport device suitable for film transport rolls that are transported under tension.

(2) Configuration of conventional example and its problems Polymer film processing equipment, film coater.

Film transport devices such as film inspection devices and film winding machines use many transport rolls.

The transport rolls are mirror-finished rolls that are coated with hard chrome plating or the like to prevent the surface shape of the roll from being transferred to the film being transported and from scratching the film.

Vacuum suction holes are provided on the roll surface in areas where there is a large tension difference between the front and rear of the transport roll, where the winding angle to the transport roll is small, and where the friction between the roll and film is small and slippage is likely to occur. A vacuum suction type conveyor roll is used.

However, with this conventional conveyor roll, if the film is very smooth or has low rigidity and the film is in close contact with the vicinity of the vacuum suction hole, the vacuum atmosphere is limited to the area around the vacuum suction hole. There was a problem in that the expected film gripping force could not be obtained because it did not spread over the entire area between the film and the roll.

(3. Purpose of the Invention The present invention was made in view of the current situation, and in the above-mentioned film conveyance device, when a film gripping force is particularly required, the film can be conveyed while stably gripping it without slipping by vacuum suction. The object of the present invention is to provide a film conveying device that does the following.

(41 Structure of the Invention The above object is achieved by the present invention as described below. That is, the present invention provides a conveying device that conveys a flexible film while sucking it to the surface by vacuum suction. A ventilating material having a ventilating material is disposed on the surface so that the communication hole communicates with the vacuum suction hole on the surface, and the air between the ventilating material and the flexible film is removed by the exhaust action from the vacuum suction hole. This is a film transport device characterized by uniform exhaustion.

As mentioned above, in the present invention, a ventilation material having three-dimensional, that is, a large number of communication holes that are not closed by the suction of a flexible film is disposed above the vacuum suction hole, so that the vacuum suction cannot be performed as in the conventional case. The holes are not completely blocked by the suctioned film, so a large gripping force as expected can be obtained, and at the same time, the communicating holes of the ventilation material are not closed by the flexible film. Since the film is so small that it does not get sucked into it, it can be transported without damaging the film being transported.

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

The details of the present invention will be explained below using the above-mentioned film transport roll as an example. Fig. 1 (A) is a partial sectional view showing the structure of the transport roll of the embodiment, and Fig. 1 (B) is FIG.

In the figure, 1 is a vacuum suction hole drilled in the roll body 5, 2 is an exhaust pipe to maintain a vacuum inside the conveyor roll, and 3 is a rotary seal to maintain airtightness.This basic configuration is similar to the conventional vacuum suction hole. It is the same as the mold conveyor roll.

4 in the figure shows the ventilation material according to the present invention, which, as described above, has a large number of communicating holes that communicate with the vacuum suction port 1 and are not closed by the suction of the flexible film 10.

As long as it has a target or three-dimensional shape, it is acceptable, but as shown in the figure, it is preferable to arrange it so as to cover almost the entire surface of the roll provided with the vacuum suction port, from the viewpoint of gripping force, etc.
In addition, the larger the cross-sectional area of the communication hole 6 is, the better, as long as it is not blocked by the above-mentioned suctioned flexible film from the exhaust surface, but from the viewpoint of transfer to the film, damage, etc., a small cross-sectional area is preferable. The pore shape of the material; the thickness and material are determined by the rigidity of the target film and the required gripping force, and must be determined experimentally.

In particular, for polymer films that are difficult to handle and are susceptible to transfer, and for functional polymer films on which a functional film is formed, it is preferable that the communicating holes have a minute cross-sectional area that prevents transfer.

As mentioned above, the opening cross-sectional area of the communication hole changes depending on the gripping force and film rigidity, but by setting it to 100 μm or less, the occurrence of transfer can be prevented under practical conditions even in the above-mentioned polymer film with a film thickness of 200 μm or less. be done.

In view of the above points and ease of availability, the ventilation material 4 is a nonwoven fabric made of a polymeric material.

A sintered metal with a smooth surface and a specially processed woven fabric used for paper, P cloth, etc. that has many communicating holes used for filtration etc. can be preferably used. Among them, nonwoven fabrics made of polymeric materials have a basis weight of 20 to 300 g/r.
d.Thickness of 1 m+ or less, and for sintered metal, particle size of equivalent diameter of 100 μm or less can be widely applied to conveying the polymer film in terms of gripping force and film damage. , is preferably used.

Hereinafter, the gripping force measurement to explain the evaluation results of the gripping force of the specific example of the ventilation material 4 will be carried out using the gripping force evaluation method shown in FIG.
A comparison was made between a conventional surface, that is, a hard chrome-plated mirror surface with vacuum suction holes, and a surface on which the ventilation material 4 was fixedly fixed without slipping.

In FIG. 2, reference numeral 101 denotes a suction box on which an evaluation sample is attached, and the inside thereof is evacuated by a suction blower 102. A sample plate 103 is set in the suction box 101, and a flexible film 10 is placed on top of the sample plate 103.
4 and connect one end of it to the tension meter 105.

The vacuum valve 106 adjusts the evacuation, and the vacuum gauge 107 maintains the degree of vacuum, that is, its scale, by pulling the tension gauge 105 and placing the film 104 on the sample plate 103.
The tension at the point where it shifted was measured, and the gripping force was evaluated based on this value.

The sample plate evaluated is shown in FIG.

The gripping force shown in FIG. 4, which shows the results of measurements with different thicknesses of the flexible film 104, is the value measured by the tension meter.

Note that a polyethylene terephthalate (PET) film was used as the flexible film 104.

From FIG. 4, it can be seen that the mirror surface of the conventional example cannot be expected to have a large gripping force for a polymer film of 175 μm or less.

On the other hand, in the example provided with the ventilation material, the gripping force is several times higher than that of the conventional example. In particular, a large gripping force was obtained in the case of a thinner film, and it can be seen that it is particularly effective for polymer films of 200 μm or less.

In any of the Examples, no transfer of the surface shape of the sample plate to the flexible film occurred in the above evaluation.

Therefore, by selecting the above-mentioned ventilation material in consideration of the influence of scratches on the film during slipping, ease of processing, and maintainability, a transport roll suitable for the desired film can be obtained.

In addition, many ventilation materials generally have a planar shape, and when disposed on the roll surface, it is necessary to connect them with a single line on the roll circumference. It is possible to sufficiently prevent the quality of the film from being affected by the connecting wires, but as shown in Figure 5, in the case of general butt-attached pasting, diagonal joints (Figure (A)), thick ventilation materials, etc. In the case of 202, diagonal seaming in the thickness direction (
(B)) is preferable, and in the case of a thin ventilation material 202,
Layered joints (Figure (C)) may also be used.

In this case, the vacuum suction hole 2 provided in the Rofur main body 201
03 is preferably connected without crushing it, and the gap between the two is preferably 0.1 fl or less.

(5) Effects of the Invention As described above, the present invention provides a vacuum state in the entire area between the film being conveyed and the gripping surface by arranging the ventilation material having a large number of three-dimensional communication holes over the vacuum suction holes. It is possible to spread the film evenly and grip the film effectively. It is particularly suitable for high-speed transport rolls whose gripping force is reduced by accompanying airflow, and rigid photographic transport rolls that firmly transport film where the influence of gravity cannot be ignored.

[Brief explanation of drawings]

FIG. 1(A) is an explanatory diagram of the vacuum suction type conveyance roll of the example, FIG. 1(B) is an enlarged view of part A in the figure, and FIG.
An explanatory diagram of the gripping force test device, Fig. 3 is a list of test sample characteristics, Fig. 4 is a graph showing the gripping force measurement results of each sample, and Fig. 5 is a method of disposing the ventilation material on the transport roll. FIG. 5.201: Roll body 1, 203: Vacuum suction hole 4.202: Ventilation material 101: Suction box 103: Sample plate 105: Tension meter N2 diagram RO o o RO 0O co ridge G &! Nen g - (A) B thigh drawing 01 drawing (β) (C) Fig. 5

Claims (1)

[Scope of Claims] 1. In a conveying device that conveys a flexible film while sucking it to the surface by vacuum suction, a ventilation material having a plurality of three-dimensional communication holes is connected to the vacuum suction holes on the surface. A film conveying device characterized in that the film conveying device is arranged on the surface so as to uniformly exhaust air between the ventilation material and the flexible film by an exhaust action from the vacuum suction hole. 2. The film conveying device according to claim 1, wherein the ventilation material has minute communication holes and surface smoothness that do not cause transfer to the flexible film due to suction. 3. The film conveying device according to claim 2, wherein the ventilation material is a sintered metal having a particle size with an equivalent diameter of 100 μm or less. 4. The film conveying device according to claim 2, wherein the ventilation material is a nonwoven fabric having a basis weight of 20 to 300 g/m^2 and a thickness of 1 mm or less. 5. The film transport device according to any one of claims 1 to 4, wherein the transport device is a transport roller. 6. The film transport device according to any one of claims 1 to 5, wherein the flexible film is a polymer film or a functional polymer film in which a functional film is laminated on a polymer film. 7. The film transport device according to any one of claims 1 to 6, wherein the flexible film has a thickness of 10 to 200 μm.