JP7713839B2 - Non-contact transport device and film manufacturing method - Google Patents

Description

The present invention relates to a non-contact conveying device that conveys long objects while floating them with gas, and a method for manufacturing a film using the non-contact conveying device.

Various non-contact conveying devices have been devised in the past that convey long objects such as films and metal foils while floating them with a gas such as air. A typical non-contact conveying device is, for example, one that is equipped with a cylindrical roll having a conveying surface that guides the object being conveyed from the upstream side to the downstream side of the conveying path, and has a large number of fine gas ejection holes on the conveying surface. In this non-contact conveying device, gas is ejected from the conveying surface, making it possible to convey the object in a non-contact state. However, when the object is conveyed onto the conveying surface or conveyed off the conveying surface to the next process, the object comes into contact with the roll, causing a problem of damage to the object.

As a countermeasure, the shape of the rolls of the non-contact transport device is often improved. For example, the rolls of the non-contact transport device of Patent Document 1 are semi-cylindrical in cross section, that is, have a shape with flat surfaces connected to both ends of the arc of a semi-cylinder. In this non-contact transport device, the transported object is transported into one flat surface, turns around at the top of the curved surface, and is transported out from the other flat surface. The nozzle holes formed in the curved surface and both flat surfaces have carefully designed opening angles and shapes. In other words, they are designed so that the amount of gas required to ensure the transported object floats when it is transported into the roll and when it is transported out of the roll.

JP 2013-23371 A

In non-contact conveying devices such as those in Patent Document 1, the nozzle holes formed on the conveying surface must be formed with a carefully calculated opening angle and shape, and the design of the flow paths inside the roll is also complex. In many cases, a special design is required to suit the site where the non-contact conveying device is installed, and the processing is difficult and costly. Items are often conveyed continuously in a non-contact manner, and when multiple non-contact conveying devices are required, the equipment costs become enormous, posing a problem of high manufacturing costs for the products related to the items being conveyed.

One embodiment of the present invention has been developed in consideration of the above problems, and its purpose is to provide a non-contact conveying device with a simple structure that can reduce the risk of the transported object coming into contact with the non-contact conveying device.

One embodiment of the present invention includes the following aspects:

[1] A cylindrical roll having a conveying surface that guides a long object conveyed from an upstream side of a conveying path to a downstream side of the conveying path,
A plurality of nozzles are formed on the conveying surface to eject gas that causes the object to float,
A non-contact conveying device in which a convex portion or a concave portion extends along the width direction of the conveying path in the upstream and downstream regions of the conveying surface and at a position different from the ejection holes, or multiple convex portions or concave portions are provided along the width direction of the conveying path.

[2] A portion of the conveying surface where the conveyed object is turned back from the upstream side to the downstream side is called a top portion,
The non-contact conveying device of claim 1, wherein the convex portion or the concave portion is arranged, on a cut surface when the roll is cut in a plane perpendicular to the central axis of the roll, perpendicular to a line connecting the top portion and the center of the cut surface, and within a range of 0.5 degrees to 5 degrees on the top side of a line passing through the center.

[3] The non-contact conveying device according to [1] or [2], wherein the convex portion or the concave portion is semicircular on a cut surface obtained by cutting the roll along a plane perpendicular to the central axis of the roll.

[4] The non-contact conveying device according to any one of [1] to [3], wherein the convex portion or the concave portion is provided at least in the area where the conveyed object covers the conveying surface.

[5] A method for producing a film, the method comprising, as one step, a step of transporting a long object using a non-contact transport device described in any one of [1] to [4].

The non-contact conveying device of one embodiment of the present invention has a simple structure and can reduce the risk of the conveyed object coming into contact with the non-contact conveying device.

1 is a side view showing a non-contact transport device according to a first embodiment. FIG. 2 is a perspective view showing a non-contact transport device. FIG. 2 is a cross-sectional view of the roll cut along a plane perpendicular to the central axis of the roll. 4 is an enlarged view of a portion of the conveying surface where a convex portion is provided. FIG. 1 is a cross-sectional view of a roll cut along a plane perpendicular to the central axis of the roll when no protrusions are provided on the upstream and downstream sides of the transport surface of the roll. FIG. 1 is a cross-sectional view of a roll cut along a plane perpendicular to the central axis of the roll when protrusions are provided on the upstream and downstream sides of the transport surface of the roll. FIG. FIG. 13 is a perspective view showing a non-contact transport device according to a first modified example. FIG. 11 is a perspective view showing a non-contact transport device according to a second modified example. FIG. FIG. 11 is a perspective view showing a non-contact transport device according to a second embodiment. FIG. 2 is a cross-sectional view of the roll cut along a plane perpendicular to the central axis of the roll. 4 is an enlarged view of a portion of the conveying surface where a recess is provided. FIG. FIG. 11 is a perspective view showing a non-contact transport device according to a third modified example. FIG. 13 is a perspective view showing a non-contact transport device according to a fourth modified example.

The embodiments of the present invention are described below, but the present invention is not limited thereto. The present invention is not limited to each of the configurations described below, and various modifications are possible within the scope of the claims. In addition, embodiments obtained by combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment. Note that the patent documents described in this specification are incorporated herein by reference. In addition, unless otherwise specified in this specification, "A to B" representing a numerical range means "A or more (including A and greater than A) and B or less (including B and smaller than B)."

[Technical Concept of the Embodiments of the Present Invention]
As a result of intensive research, the inventors decided to use an inexpensive cylindrical roll, provide a mechanism for supplying compressed gas to one or both ends of the roll in the axial direction, and arrange gas outlet holes at a predetermined pitch in the axial direction and circumferential direction of the roll on the conveying surface of the roll. They discovered that by providing a convex or concave portion extending along the width direction of the conveying path in the upstream and downstream regions of the conveying path on the conveying surface, or by providing a plurality of convex or concave portions along the width direction of the conveying path, the conveyed object can be floated so as not to come into contact with the non-contact conveying device, and conveyed without scratching, and completed the present invention.

The following is a specific explanation based on the drawings.
[Embodiment 1]

<Configuration of non-contact transport device 1>
Fig. 1 is a side view showing a non-contact transport device 1 according to embodiment 1. In Fig. 1, the central axis direction of a roll 11 is set as the X-axis direction.
The non-contact transport device 1 includes a roll 11 and a gas supply pipe 12 for supplying air or other gas that floats a long transported object K. The roll 11 is made of, for example, polyvinyl chloride, has a cylindrical shape, and has a cavity filled with gas inside. The roll 11 may be made of other synthetic resins such as polyethylene and polypropylene, or may be made of metal. The roll 11 may have, for example, an end face diameter of 40 mm to 300 mm and a length in the X-axis direction of 250 mm to 2000 mm. The transported object K is transported in a floating state from the roll 11 along a transport path from the back side to the front side of the paper in FIG. 1. The transported object K may be a belt-shaped transported object, and its material, shape, size, and thickness are not particularly limited. Examples of the transported object K include a film, a metal foil, a woven fabric, paper, and a tape. Examples of the transported object K include a film having a width of 50 mm to 1900 mm and a thickness of 0.01 mm to 0.4 mm.

The roll 11 has a conveying surface 13 that guides the transported object K transported from the upstream side of the transport path (hereinafter simply referred to as the "upstream side") to the downstream side of the transport path (hereinafter simply referred to as the "downstream side") without contact. The conveying surface 13 has a plurality of nozzle holes 13a (not shown) at equal intervals over the entire length in the X-axis direction, which are described later and are used to blow gas from the inside to float the transported object K. In FIG. 1, the conveying surface 13 is surrounded by a solid line for convenience of explanation, but the conveying surface 13 is a partial area of the surface of the roll 11 and does not have to be an area that can be distinguished from other parts of the surface of the roll 11. The conveying surface 13 is a curved surface whose end in the X-axis direction is semicircular in side view, and the dimension in the Z-axis direction of the conveying surface 13 in FIG. 1 is approximately half the dimension in the Z-axis direction of the roll 11 (see FIG. 3).

The length of the conveying surface 13 in the X-axis direction in FIG. 1 is preferably at least equal to or greater than the width of the conveyed object K. In this case, the conveyed object K can be floated well during conveying, and contact with the non-contact conveying device 1 is suppressed. The ratio of the length of the conveying surface 13 in the X-axis direction to the width of the conveyed object K is more preferably 1.01 to 1.40, and even more preferably 1.01 to 1.10. For example, when the length of the roll 11 in the X-axis direction is 1500 mm and the width of the conveyed object K is 1300 mm, the length of the conveying surface 13 in the X-axis direction may be 1400 mm.

Supply pipes 12 are connected to both ends of the roll 11 in the central axis direction. Gas such as air compressed by a blower device (not shown) is introduced into the inside of the roll 11 through the supply pipes 12. The gas introduced into the roll 11 is ejected from the ejection holes in the conveying surface 13, so that the transported object K is guided to the conveying surface 13 in a floating state and transported. The supply pipes 12 may be connected to one end of the roll 11.

<Configuration of conveying surface 13>
The conveying surface 13 will be described in detail below. Fig. 2 is a perspective view showing the non-contact conveying device 1. Fig. 3 is a cross-sectional view of the roll 11 cut along a plane parallel to the end face (when the roll 11 is cut along a plane perpendicular to the central axis of the roll 11). Fig. 4 is an enlarged view of a portion where the convex portion 13b is provided. In the conveying surface 13 of the roll 11, a portion where the conveyed object K is turned back from the upstream side to the downstream side of the conveying path of the conveyed object K is called the apex 13t. As shown in Figs. 2 and 3, the conveying surface 13 is provided with a plurality of gas ejection holes 13a from the apex 13t to the upstream side and downstream side.

The ejection holes 13a are formed at predetermined angles in the circumferential direction in the cross section of FIG. 3, ranging from 2° to 15°. In other words, the distance between the centers of adjacent ejection holes 13a in the circumferential direction is equal. The angle at which the ejection holes 13a are formed is preferably in the range of 3° to 10°. The diameter of the ejection holes 13a is preferably in the range of 0.1 mm to 3 mm, and more preferably in the range of 0.5 mm to 2 mm.

When the nozzle holes 13a are formed at a predetermined angle in the circumferential direction in the range of 3° to 10° and the diameter is in the range of 0.5 mm to 2 mm, processing is easy, the internal pressure of the roll 11 that ejects the gas is obtained, and a good gas ejection speed and viscosity are obtained. The angle at which the nozzle holes are formed and the rate of increase in diameter are set taking into account the weight, thickness, and width of the transported object K, and the size of the roll 11. In FIG. 3, as an example, the nozzle holes 13a are formed at every 10°. As an example, the diameter of the nozzle holes 13a is 1 mm.

1 to 3, the upstream and downstream sides of the conveying path of the conveying surface 13 are provided with convex portions 13b extending in the X-axis direction. The convex portions 13b ensure the floating amount of the conveyed object K, as described later. When the convex portions 13b are provided on the downstream side, the convex portions 13b are provided further downstream than the row of the nozzle holes 13a arranged on the most downstream side of the conveying surface 13, along the row of the nozzle holes 13a. When the convex portions 13b are provided on the upstream side of the conveying path, the convex portions 13b are provided further upstream than the row of the nozzle holes 13a arranged on the most upstream side of the conveying surface 13, along the row of the nozzle holes 13a. In FIGS. 1 and 2, the length of the convex portions 13b is longer than the width of the conveying surface 13 and is approximately equal to the width of the roll 11, but this is not limited to this case. As described above, the width of the conveying surface 13 is preferably equal to or greater than the width of the conveyed object K, and the length of the convex portions 13b is preferably equal to or greater than the width of the conveying surface 13, i.e., equal to or greater than the width of the conveyed object K.

In the cross-sectional view of FIG. 3, the convex portion 13b is preferably provided so as to be perpendicular to the line u connecting the top 13t and the center 13m of the cut surface, and to form a predetermined angle in the range of 0.5° to 5° with respect to the line v passing through the center 13m on the top 13t side. In this case, in the area where gas is easily released, as described later, the floating amount of the transported object K can be secured well. It is more preferable that the convex portion 13b is provided at an angle in the range of 1° to 4°. It is preferable that the convex portion 13b is semi-cylindrical, that is, the end face is semi-circular. In this case, processing is easy. The semicircle of the end face of the convex portion 13b is not a perfect circle, and the side wall part of the convex portion 13b rising from the surface of the transport surface 13 may be shaped so that it is approximately perpendicular to the surface of the transport surface 13. The convex portion 13b may be a prism with a polygonal end face. When the convex portion 13b is semi-cylindrical, the diameter of the semicircle of the end face is preferably 0.5 mm to 3 mm. It is more preferable that the diameter is 1 mm to 2.5 mm. One example is when the diameter of the semicircle of the protrusion 13b is 1 mm.

In Figures 3 and 4, the angle between line v and line j connecting the center 13m and the most downstream nozzle hole 13a is 10°, and the angle between line v and line i connecting the center 13m and the downstream convex portion 13b is 3.3°.

Figure 5 is a cross-sectional view of the roll 11 cut along a plane perpendicular to the central axis of the roll 11 when no convex portion 13b is provided on the upstream and downstream sides of the transport path of the transport surface 13 of the roll 11. The left side in Figure 5 is the upstream side, and the right side is the downstream side. In Figure 5, the arrows indicate the flow of gas ejected from inside the roll 11 in the space between the transport surface 13 and the transported object K. On the upstream and downstream sides, the gas flows along the transported object K in a direction in which pressure is easily released (downward in the figure), so the pressure generated in the space between the transport surface 13 and the transported object K is lower than that on the top 13t side, and the amount of lift of the transported object K decreases. For this reason, scratches and the like may occur due to contact between the transport surface 13 and the transported object K.

Figure 6 is a cross-sectional view of the roll 11 cut along a plane perpendicular to the central axis when the convex portions 13b are provided on the upstream and downstream sides of the conveying surface 13 of the roll 11. The presence of the convex portions 13b generates a following flow close to the centrifugal direction along the curved surface of the convex portions 13b, so that the pressure generated in the space between the conveying surface 13 and the conveyed object K is maintained at the same level as the apex 13t side, and the floating amount of the conveyed object K does not decrease and no contact failure occurs. From the viewpoint of this action, it is preferable to provide the convex portions 13b at a position further upstream and downstream (lower side of Figure 6) than the row of ejection holes 13a arranged on the most upstream and downstream sides of the conveying surface 13, and at an angle of 1° to 5° on the apex 13t side with respect to a line that passes through the center of the roll 11 and is parallel to the Y axis in the cross-sectional view.

As described above, the non-contact transport device 1 according to this embodiment can ensure a floating amount that prevents the transported object K from coming into contact with the roll 11 when the transported object K is transported into and out of the roll 11, reducing the risk of contact with the roll 11 and suppressing the occurrence of scratches. The configuration of the roll 11 is simple and can be made using inexpensive materials such as polyvinyl chloride, making the manufacturing cost of the non-contact transport device 1 low.

By providing the convex portion 13b at least in the area where the transported object K covers the transport surface 13, contact between the transported object K and the non-contact transport device 1 during transport is effectively suppressed.

<Modification 1>
7 is a perspective view showing a non-contact transport device 14 according to Modification 1. The non-contact transport device 14 includes a roll 15 and a gas supply pipe 12. The roll 15 has a similar configuration to the roll 11. A plurality of gas ejection holes 16a are provided on the transport surface 16 of the roll 15, similar to the transport surface 13.

In the first modification, the convex portion 16b is semi-cylindrical and is provided intermittently, not continuously, along the row of the nozzle holes 16a downstream of the row of the nozzle holes 16a arranged at the most downstream side of the conveying surface 16. Similarly, the convex portions 16b are provided intermittently on the upstream side of the conveying surface 16. The interval between adjacent convex portions 16b in the X-axis direction is set so that the amount of lift of the conveyed object K is sufficient to prevent the conveyed object K from coming into contact with the roll 15 when the conveyed object K is conveyed into the roll 15 and when the conveyed object K is conveyed out of the roll 15. The convex portion 16b may be a prism having polygonal end faces. The convex portion 16b may also be a hemispherical dome shape.

<Modification 2>
8 is a perspective view showing a non-contact transport device 17 according to Modification 2. The non-contact transport device 17 includes a roll 18 and a gas supply pipe 12. The roll 18 has a similar configuration to the roll 11. A plurality of gas ejection holes 19a are provided on a transport surface 19 of the roll 18, similar to the transport surface 13.

In the second modification, the convex portions 19b are semi-cylindrical and are provided in two rows on each of the upstream and downstream sides of the conveying surface 19 along the X-axis direction. That is, in the case of the downstream side, one row of the convex portions 19b is provided on each of the upstream and downstream sides of the row of the nozzle holes 19a arranged on the most downstream side of the conveying surface 19. Similarly, in the case of the upstream side, two rows of the convex portions 19b are provided. The interval between the rows of the convex portions 19b is set so as to ensure the floating amount of the conveyed object from the roll 18 and reduce the occurrence of scratches. In the second modification, the pressure generated in the space between the conveying surface 13 and the conveyed object K on the upstream and downstream sides is higher than that in the case of one row, and when the conveyed object K is conveyed to the roll 18 and when the conveyed object K is conveyed out of the roll 18, the floating amount at which the conveyed object K does not come into contact with the roll 18 can be ensured. The height of the convex portions 19b on the conveying side and the conveying side of the conveyed object K may be higher than the height of the row on the top side.

<Configuration of Transport System 100>
FIG. 9 is a front view showing the conveying system 100. In the case where the Z-axis direction in FIG. 9 is the up-down direction, in the conveying system 100, a plurality of non-contact conveying devices 1 are arranged along the X-axis direction so that they are staggered up and down. Since it is configured as described above, the pressure in the space between the conveying object K and the conveying surface 13 is high on the upstream side and downstream side of the conveying surface 13, and when the conveying object K is conveyed into the roll 11 and when it is conveyed out of the roll 11, the amount of floating of the conveying object K not coming into contact with the roll can be secured. Therefore, the conveying object K is conveyed by the conveying system 100 without being damaged. Since the configuration of the conveying surface 13 is simple and the non-contact conveying device 1 can be manufactured inexpensively, the conveying system 100 can also be manufactured inexpensively.

<Film manufacturing method>
Hereinafter, a case where a film is manufactured using the conveying system 100 will be described. As an example, a case where the conveying system 100 is stored in a drying furnace (not shown), and a laminate in which a resin layer is laminated on a substrate is conveyed as a conveyed item K will be described. The inside of the drying furnace is maintained at a predetermined temperature. While being conveyed through the heating furnace by the conveying system 100, the laminate is thermally shrunk, and a film is formed. Since the laminate does not come into contact with the roll 11, the film is formed without causing any scratches. Note that the laminate is not limited to being heated using the conveying system 100, and the conveying system 100 can also be used for other film manufacturing processes.

[Embodiment 2]
<Configuration of non-contact transport device 20>
Fig. 10 is a perspective view showing a non-contact transport device 20 according to embodiment 2. Fig. 11 is a cross-sectional view of the roll 21 cut along a plane perpendicular to the central axis of the roll 21. Fig. 12 is an enlarged view of a portion where the recesses 22b are provided.

The non-contact conveying device 20 includes a roll 21 and a gas supply pipe 12. The roll 21 has a similar configuration to the roll 11. The conveying surface 22 of the roll 21 is provided with a plurality of gas ejection holes 22a, similar to the conveying surface 13.

<Configuration of conveying surface 22>
As shown in Fig. 10 to Fig. 12, the non-contact transport device 20 is different from the non-contact transport device 1 in that the recesses 22b extending in the X-axis direction are provided on the upstream and downstream sides of the transport path of the transport surface 22. The recesses 22b ensure the floating amount of the transported object K. When the recesses 22b are provided on the downstream side, the recesses 22b are provided further downstream from the row of the ejection holes 22a arranged on the most downstream side of the transport surface 22, along the row of the ejection holes 22a. When the recesses 22b are provided on the upstream side, the recesses 22b are provided further upstream from the row of the ejection holes 22a arranged on the most upstream side of the transport surface 22, along the row of the ejection holes 22a. Figs. 10 and 11 show a case where the length of the recesses 22b is longer than the width of the transport surface 22 and is approximately equal to the width of the roll 21, but this is not limited to this case. It is preferable that the width of the transport surface 22 is equal to or greater than the width of the transported object K, and it is preferable that the length of the recesses 22b is equal to or greater than the width of the transport surface 22, i.e., equal to or greater than the width of the transported object K.

In the cross-sectional view of FIG. 11, the recess 22b is provided at a position perpendicular to the line u connecting the top 22t and the center 22m of the cut surface, and at a predetermined angle in the range of 0.5° to 5° with respect to the line v passing through the center 22m, on the top 22t side. In this case, the amount of levitation of the transported object K can be secured satisfactorily in the area where gas can easily escape. The recess 22b is preferably provided at an angle in the range of 1° to 4°. As shown in FIG. 12, the recess 22b is preferably a round groove with a semicircular end face. In this case, processing is easy. The end face of the recess 22b may not be a perfect circle, and the side face of the recess 22b may be approximately perpendicular to the surface of the transport surface 22. The recess 22b may be a square groove with a polygonal end face. When the end face of the recess 22b is semicircular, the diameter of the semicircle of the end face is preferably 0.5 mm to 3 mm. It is more preferable that the diameter is 1 mm to 2.5 mm. As an example, the diameter of the semicircle of the recess 22b is 1 mm.

In Figures 11 and 12, the angle between line j connecting the center 22m and the most downstream nozzle hole 22a and line v that is perpendicular to line u connecting the apex 22t and the center 22m and passes through the center 22m is 10°, and the angle between line i connecting the center 22m and the downstream recess 22b and line v is 3.3°.

The non-contact conveying device 20 is configured as described above. The gas ejected from the ejection hole 22a flows into the recess 22b before passing through to the inlet side or outlet side of the conveyed object K, and when it flows out of the recess 22b, it proceeds in a direction away from the surface of the conveying surface 22. Therefore, the pressure generated in the space between the conveying surface 22 and the conveyed object K on the inlet side or outlet side of the conveyed object K is higher than when the recess 22b is not provided, the floating amount of the conveyed object K does not decrease, contact failure does not occur, and the occurrence of scratches is reduced. From the viewpoint of the above action, it is preferable to provide the recess 22b at a position where the line i and the line v form an angle of 1° to 5° further upstream and downstream (lower side of FIG. 11) than the row of ejection holes 22a arranged on the most upstream and downstream sides of the conveying surface 22. By providing the recess 22b at least in the area where the conveyed object K covers the conveying surface 22, contact with the non-contact conveying device 20 during conveying of the conveyed object K is suppressed well.

The roll 21 has a simple structure and can be made using inexpensive materials such as polyvinyl chloride, making the manufacturing cost of the non-contact conveying device 20 low.

When a conveying system is formed using multiple non-contact conveying devices 20, when the conveyed object K is conveyed into the roll 21 in each non-contact conveying device 20 and when it is conveyed out of the roll 21, a floating amount can be ensured that the conveyed object K does not come into contact with the roll 21. Therefore, the conveyed object K is conveyed by the conveying system without the occurrence of scratches. Since the configuration of the conveying surface 22 is simple and the non-contact conveying devices 20 can be manufactured inexpensively, the conveying system can also be manufactured inexpensively. When the conveying system is used in a film manufacturing process, a film is formed without the occurrence of scratches.

<Modification 3>
13 is a perspective view showing a non-contact transport device 23 according to Modification 3. The non-contact transport device 23 includes a roll 24 and a gas supply pipe 12. The roll 24 has a similar configuration to the roll 11. A plurality of gas ejection holes 25a are provided on a transport surface 25 of the roll 24, similar to the transport surface 13.

In the third modification, the recesses 25b are round grooves with semicircular end faces, and are provided intermittently, not continuously, along the row downstream of the row of ejection holes 25a located at the most downstream side of the conveying surface 25. Similarly, the recesses 25b are provided intermittently on the upstream side of the conveying surface 25. The interval between adjacent recesses 25b in the X-axis direction is set so that the lift amount of the conveyed object K is secured so that the conveyed object K does not come into contact with the roll 24 when the conveyed object K is conveyed to the roll 24 and when the conveyed object K is conveyed from the roll 24. The recesses 25b may be square grooves with polygonal end faces. The recesses 25b may also be hemispherical recesses.

<Modification 4>
14 is a perspective view showing a non-contact transport device 26 according to Modification 4. The non-contact transport device 26 includes a roll 27 and a gas supply pipe 12. The roll 27 has a similar configuration to the roll 11. A plurality of gas ejection holes 28a are provided on a transport surface 28 of the roll 27, similar to the transport surface 13.

In the fourth modification, two rows of recesses 28b are provided on the upstream and downstream sides along the X-axis direction. That is, on the downstream side, one row of recesses 28b is provided on each of the upstream and downstream sides of the row of nozzle holes 28a arranged on the most downstream side of the conveying surface 28. Similarly, two rows of recesses 28b are provided on the upstream side. The spacing between the rows of recesses 28b is set so as to ensure the amount of lift of the conveyed object from the roll 27 and reduce the occurrence of scratches. In the fourth modification, the pressure generated in the space between the conveying surface 28 and the conveyed object K on the upstream and downstream sides is higher than in the case of one row, and when the conveyed object K is conveyed to the roll 27 and when the conveyed object K is conveyed from the roll 27, the amount of lift that does not cause the conveyed object K to come into contact with the roll 27 can be ensured.

The present invention provides an inexpensive non-contact conveying device with a simple structure that reduces the risk of the conveyed object coming into contact with the non-contact conveying device. Therefore, the present invention can be suitably used for non-contact conveying of thin conveyed objects such as films.

1, 14, 17, 20, 23, 26 Non-contact conveying device 11, 15, 18, 21, 24, 27 Roll 12 Supply pipe 13, 16, 19, 22, 25, 28 Conveying surface 13a, 16a, 19a, 22a, 25a, 26a, 28a Spout hole 13b, 16b, 19b Convex portion 22b, 25b, 28b Concave portion 100 Conveying system

Claims (4)

a cylindrical roll having a conveying surface that guides a long object conveyed from an upstream side of a conveying path to a downstream side of the conveying path,
A plurality of nozzles are formed on the conveying surface to eject gas that causes the object to float,
a convex portion or a concave portion extends along a width direction of the transport path in the upstream side and the downstream side regions of the transport surface and at a position different from the nozzle holes, or a plurality of convex portions or concave portions are provided along the width direction of the transport path,
A portion of the conveying surface where the conveyed object is turned back from the upstream side to the downstream side is referred to as a top portion,
the convex portion or the concave portion is provided on a cut surface of the roll cut along a plane perpendicular to the central axis of the roll, so as to be perpendicular to a line connecting the apex and a center of the cut surface, and within a range of 0.5 degrees to 5 degrees on the apex side with respect to a line passing through the center,
A non-contact transport device , wherein a transport direction of the object on the upstream side of the roll and a transport direction of the object on the downstream side of the roll are parallel to each other . The non-contact transport device according to claim 1 , wherein the convex portion or the concave portion has a semicircular shape on a cut surface when the roll is cut along a plane perpendicular to a central axis of the roll. 3. The non-contact transport device according to claim 1 , wherein the convex portion or the concave portion is provided at least in an area where the transported object covers the transport surface. A method for producing a film, comprising, as one step, a step of transporting a long object using the non-contact transport device according to any one of claims 1 to 3 .