JPWO2011158594A1 - Thin film glass conveying apparatus and thin film glass conveying method - Google Patents

Abstract

Suppresses breakage of thin film glass during transportation. In the thin-film glass transport device that transports the long thin-film glass along the longitudinal direction with a plurality of transport rolls, the plurality of transport rolls includes both end portions in the width direction of the thin-film glass and the peripheral surface of the transport roll. The second peripheral surface portion opposed to the inner side in the width direction of the thin film glass excluding both ends in the width direction is configured to contact the thin film glass with a larger contact pressure than the opposing first peripheral surface portions. A thin-film glass conveying device.

Description

  The present invention relates to a transport device for thin film glass and a transport method for thin film glass.

  In recent years, a thin film glass excellent in gas barrier properties and translucency has been suitably used as a substrate material for display devices. This thin glass is an extremely thin glass having a thickness of 200 μm or less, preferably 30 to 150 μm, and has flexibility due to its thinness, and can be wound into a roll, for example.

  For this reason, as a technique for efficiently performing various treatments on thin film glass using this flexibility, a technique for performing various treatments on the surface of a long thin film glass while being rolled by a roll-to-roll method has been proposed. (For example, see Patent Documents 1 and 2).

JP 2010-105900 A JP-A-8-283041

  However, when the thin film glass is simply rolled and conveyed, the edges of both ends in the width direction of the thin film glass come into contact with the conveyance roll, and as a result, the stress develops in the fine cracks on the edge and the crack progresses. There is a risk that the thin film glass will be damaged. In order to suppress breakage due to such edge contact, it is preferable to use a soft material for the transport roll, but the breakage of the thin film glass has not been greatly reduced.

  Another problem is that although the above thin film glass is flexible, it is a brittle material in the first place, so that the tension distribution in the longitudinal direction is caused by the poor roll axis parallelism of the transport roll during roll transport. If an unbalance occurs, a fine crack at the end in the width direction may develop and break.

  The subject of this invention is providing the conveyance apparatus of the thin film glass which can suppress the failure | damage of the thin film glass at the time of conveyance, and the conveyance method of thin film glass.

  The object of the present invention is achieved by the following means 1 to 7.

1. In the thin film glass transport device that transports the long thin film glass with a plurality of transport rolls along the longitudinal direction,
The plurality of transport rolls are, on the peripheral surface of the transport roll, a width direction inner side portion of the thin film glass excluding the width direction both end portions from a first peripheral surface portion facing the width direction both end portions of the thin film glass. The thin film glass conveying device is configured such that the second peripheral surface portion opposed to the thin film glass is in contact with the thin film glass with a larger contact pressure.

2. In the thin film glass transport device that transports the long thin film glass with a plurality of transport rolls along the longitudinal direction,
The plurality of transport rolls are configured such that, of the peripheral surfaces of the transport rolls, the first peripheral surface portions facing both ends in the width direction of the thin film glass are not in contact with the thin film glass. 2. The apparatus for transporting thin film glass according to 1 above.

  3. 2. The apparatus for transporting thin-film glass according to 1 above, wherein the first peripheral surface portion is subjected to a surface treatment that makes the first peripheral surface portion have a lower hardness than the second peripheral surface portion. .

4). In the transport method of thin film glass that transports long thin film glass with a plurality of transport rolls along the longitudinal direction,
The plurality of transport rolls are, on the peripheral surface of the transport roll, a width direction inner side portion of the thin film glass excluding the width direction both end portions from a first peripheral surface portion facing the width direction both end portions of the thin film glass. A method of transporting a thin film glass, characterized in that the second peripheral surface portion opposed to the thin film glass is in contact with the thin film glass with a larger contact pressure.

5. In the transport method of thin film glass that transports long thin film glass with a plurality of transport rolls along the longitudinal direction,
5. The thin film glass according to 4 above, wherein, among the peripheral surfaces of each transport roll, the first peripheral surface portion facing both ends in the width direction of the thin film glass is configured not to contact the thin film glass. Transport method.

  6). As the thin film glass, the peripheral surface is stepped so that both ends in the width direction of the peripheral surface that comes into contact with the plurality of transport rolls at the time of transport are lower than the inner portion in the width direction excluding the both ends in the width direction. 6. The method for transporting thin film glass as described in 5 above, wherein the one formed in a shape is used.

  7). As the plurality of transporting rolls, the first circumferential surface portion that is subjected to a surface treatment that makes the first circumferential surface portion have a lower hardness than the second circumferential surface portion is used. The method for conveying the thin film glass according to 1.

  Moreover, the said subject is achieved also by the means of 8-15 below.

8). In the transport method of thin film glass that transports long thin film glass with a plurality of transport rolls along the longitudinal direction,
Among the plurality of transport rolls, at least one transport roll that contacts the thin film glass at a holding angle of 40 degrees or more, and the other transport roll adjacent to the one transport roll, the one transport roll and The difference ΔL between the conveyance direction lengths L1 and L2 at both ends in the width direction of the thin-film glass stretched between the other conveyance rolls and the average length L of the conveyance direction lengths L1 and L2 A method for transporting thin film glass, characterized in that a material having a thickness ratio ΔL / L of 0.005 or less is used.

  9. 9. The transport of thin film glass according to 8 above, wherein the one transport roll and the other transport roll are arranged so that the length ratio ΔL / L is 0.002 or less. Method.

  10. The above 8 or 9, wherein the one transport roll and the other transport roll are arranged so that a difference ΔL between the transport direction lengths L1 and L2 is within 1.5 mm. The conveyance method of thin film glass of description.

  11. Conveyance of thin film glass as described in any one of said 8-10 using what was comprised so that alignment adjustment was possible as at least one of said one conveyance roll and said other conveyance roll. Method.

12 In the thin film glass transport device that transports the long thin film glass with a plurality of transport rolls along the longitudinal direction,
Among the plurality of transport rolls, at least one transport roll that comes into contact with the thin film glass at a holding angle of 40 degrees or more and another transport roll adjacent to the one transport roll are the one transport roll. And the difference ΔL between the conveyance direction lengths L1, L2 at both ends in the width direction of the thin film glass stretched between the other conveyance roll and the average length L of the conveyance direction lengths L1, L2. A thin-film glass conveying device, wherein the length ratio ΔL / L is arranged to be 0.005 or less.

  13. 13. The apparatus for transporting thin film glass according to 12, wherein the one transport roll and the other transport roll are arranged so that the length ratio ΔL / L is 0.002 or less. .

  14 The said one conveyance roll and said other conveyance roll are arrange | positioned so that the difference (DELTA) L of the said conveyance direction length L1, L2 may be less than 1.5 mm, The said 12 or 13 characterized by the above-mentioned. Thin film glass transport device.

  15. At least one of said one conveyance roll and said other conveyance roll is comprised so that alignment adjustment is possible, The conveyance apparatus of the thin film glass as described in any one of said 12-14 characterized by the above-mentioned. .

  According to the present invention, the first circumferential surface part facing the width direction both ends of the thin film glass in the circumferential surface of the transport roll does not contact the thin film glass, or the width direction of the thin film glass in the circumferential surface of the transport roll. Since the second peripheral surface portion facing the inner portion is in contact with the thin film glass with a larger contact pressure than the first peripheral surface portion, the conveying force is mainly in the width direction of the thin film glass by the second peripheral surface portion. It will be transmitted to an inner side part, and only the conveyance load smaller than the width direction inner side part will be applied to the width direction both ends of thin film glass. Therefore, the progress of cracks at both ends in the width direction of the thin film glass can be suppressed, and as a result, breakage of the thin film glass at the time of transportation can be suppressed.

  Moreover, according to the means of said 8-15, these at least 1 one conveyance roll which contacts thin film glass with a holding angle of 40 degree | times or more, and the other conveyance roll adjacent to the said one conveyance roll are these 2 The length ratio ΔL / L between the difference ΔL in the conveyance direction lengths L1 and L2 at both ends in the width direction of the thin film stretched between two conveyance rolls and the average length L of the conveyance direction lengths L1 and L2 Is set to be 0.005 or less, it is possible to suppress the development of cracks at the end in the width direction of the thin film glass due to the poor roll axis parallelism of these two transport rolls. Therefore, damage of the thin film glass at the time of conveyance can be suppressed.

It is a figure which shows schematic structure of the conveying apparatus of thin film glass. It is a figure for demonstrating the applicable conveyance roller. It is a figure for demonstrating the applicable conveyance roller. It is a figure for demonstrating the thin film glass formed in the step shape. FIG. 3 is a diagram for explaining a conveyance system used in Example 1; 10 is a graph showing the results of Example 2. It is a figure explaining the detail of the roll used in Example 1. FIG. It is a figure explaining the detail of another roll used in Example 1. FIG. It is a figure explaining the detail of another roll used in Example 1. FIG. It is a figure explaining the detail of another roll used in Example 1. FIG. It is a figure which shows schematic structure of the conveying apparatus of thin film glass. (A), (b) It is a figure for demonstrating the holding angle (theta) of a conveyance roll, (c) It is a figure for demonstrating length ratio (DELTA) L / L. It is a figure for demonstrating the alignment adjustment mechanism of a conveyance roll. FIG. 10 is a diagram for explaining a conveyance system used in Example 3; 10 is a graph summarizing the results of Example 3. 10 is a graph summarizing the results of Example 3.

  Hereinafter, embodiments of the present invention achieved by the means 1 to 7 will be described with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of a thin film glass transfer device (hereinafter simply referred to as a transfer device) 1 in the present embodiment.

  As shown in this figure, the transport device 1 is a device that coats a functional film on the surface of the thin film glass G while transporting the long thin film glass G in a roll-to-roll manner along the longitudinal direction. . Specifically, the transport device 1 includes a feed roll 2, a take-up roll 3, a plurality of transport rolls 4,..., And a coating processing unit 5, and feeds the thin film glass G from the feed roll 2. In the process of winding with the take-up roll 3 while being transported by the transport rolls 4,..., The functional film is coated on the surface of the thin film glass G by the coating processing unit 5.

  As shown in FIG. 2 (a), the transport rolls 4,..., The width direction inner side portion (hereinafter simply referred to as the inner side portion) excluding the width direction both end portions (hereinafter simply referred to as both end portions) a of the thin film glass G to be transported. ) It is configured to contact only b. Here, “both ends” of the thin film glass G refers to a range of 1 mm from both edges in the width direction of the transport roll 4, and more preferably ranges from 5 mm from both edges in the width direction.

  In this case, the transport rolls 4,. It suffices that only the second peripheral surface portion that faces the surface is in contact with the thin film glass G. As another example of such a transport roll 4, as shown in FIG. 2 (b), only the first peripheral surface portion facing both ends a of the thin film glass G may be formed with a small diameter, As shown in FIG.2 (c), you may contact the thin film glass G in a some ring-shaped part with a small width | variety. Furthermore, as shown to Fig.3 (a), it is good also as the conveyance roll 4 by which the 1st surrounding surface part was formed in the taper shape, and as shown to FIG.3 (b), as the crown-shaped conveyance roll 4 Also good.

  The transport rolls 4 may not be in contact with both end portions a of the thin film glass G, and the second peripheral surface portion facing the inner portion b of the thin film glass G faces both end portions a. What is comprised so that it may contact with the thin film glass G with a contact pressure larger than the 1st surrounding surface part to do. Specifically, as shown in FIG. 3C, as the surface treatment for making the first peripheral surface portion 4a of the peripheral surface lower in hardness than the second peripheral surface portion 4b, the first peripheral surface portion 4a. May be subjected to treatments such as Teflon (registered trademark) impregnation-type plating, rubber lining, and resin lining.

  The difference in contact pressure between the first peripheral surface portion and the second peripheral surface portion can be confirmed, for example, by a press scale manufactured by Fuji Film. The prescale is a film that develops a red color according to the applied pressure, can grasp the difference in contact pressure due to the density difference of red, and can be converted into data by a pressure image analysis system.

  Further, as shown in FIG. 3D, the transport rolls 4,... Cover the outer periphery of the shaft core portion with a low hardness rubber (soft rubber) while forming the first peripheral surface portion in a tapered shape. The outer surface may be covered with a fluorine heat shrinkable tube. According to such a transport roll 4, it is possible to combine an elastic function with a high elastic rubber and a good skid to the thin film glass G with a heat shrinkable tube.

  Although the thin film glass G which the conveying apparatus 1 conveys is not specifically limited, thickness is 200 micrometers or less, Preferably it is 30-150 micrometers, and is an extremely thin glass.

  Moreover, as the thin film glass G, as shown to Fig.4 (a), you may use what was formed in the step shape so that both ends a may become lower (thinner) than the inner part b. In this case, the transport roll 4 may be one in which the first peripheral surface portion and the second peripheral surface portion are formed to have the same diameter. Such a thin film glass G only needs to be formed so that both end portions a are lower than the inner portion b, and may have the shapes shown in FIGS. 4B to 4D, for example. In addition, the shape of this thin film glass G should just be lower (thinner) the both ends a of the main surface which contacts the conveyance rolls 4 ... at the time of conveyance than the inner part b, for example in a conveyance line. When only one main surface of the thin-film glass G is in contact with the transport rolls 4,..., Only the both ends a of the one main surface may be lower (thinner) than the inner portion b.

  As described above, the first peripheral surface portion facing the both ends a of the thin film glass G in the peripheral surface of the transport roll 4 does not contact the thin film glass G, or the thin film glass G in the peripheral surface of the transport roll 4. Since the second peripheral surface portion facing the inner portion b of the glass plate is in contact with the thin film glass G with a contact pressure larger than that of the first peripheral surface portion, the conveying force is mainly controlled by the second peripheral surface portion. The both ends a of the thin film glass G are applied with a smaller transport load than the inner part b. Therefore, the progress of cracks at both end portions a of the thin film glass G can be suppressed, and as a result, breakage of the thin film glass G during transportation can be suppressed.

  The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

  The present invention can also be applied to the case where the thin film glass is conveyed in sheet form.

  Next, an embodiment of the means 8 to 15 will be described with reference to the drawings.

  FIG. 11 is a diagram showing a schematic configuration of a thin film glass transfer device (hereinafter simply referred to as a transfer device) 1A in the present embodiment.

  As shown in this figure, the conveying apparatus 1A is an apparatus that coats a functional film on the surface of the thin film glass G while conveying the long thin film glass G in a roll-to-roll manner along the longitudinal direction. . Specifically, the transport device 1A includes a feed roll 2, a take-up roll 3, a plurality of transport rolls 4,..., And a coating processing unit 5, and feeds the thin film glass G from the feed roll 2. In the process of winding with the take-up roll 3 while being transported by the transport rolls 4,..., The functional film is coated on the surface of the thin film glass G by the coating processing unit 5.

  Although the thin film glass G which 1 A of conveying apparatuses convey is not specifically limited, Thickness is 200 micrometers or less, Preferably it is very thin glass of 30-150 micrometers.

  At least one (three in the present embodiment) of the plurality of transport rolls 4,... Is a high holding angle roll 41 that contacts the thin film glass G at a holding angle θ of 40 degrees or more. Here, the holding angle θ is the central angle of the arc portion in contact with the thin film glass G on the peripheral surface of the transport roll 4 as shown in FIGS. 12 (a) and 12 (b).

  In the normal transport process, the necessity of designing the transport process in a compact manner (space saving), there are an overwhelming number of cases in which the arrangement of a high-holding angle roll having a holding angle of 40 degrees or more is essential.

  As shown in FIG. 12 (c), the high holding angle roll 41 and the conveying roll 4 adjacent to the high holding angle roll 41 convey the thin film glass G stretched between them at both ends in the width direction. The length ratio ΔL / L between the difference ΔL in the direction lengths L1 and L2 and the average length L of the conveyance direction lengths L1 and L2 is 0.005 or less, preferably 0.002 or less. Has been. Further, the high holding angle roll 41 and the conveying roll 4 adjacent to the high holding angle roll 41 are arranged such that the difference ΔL between the conveying direction lengths L1 and L2 is within 1.5 mm.

  Further, the high holding angle roll 41 is configured such that alignment adjustment is possible. Specifically, as shown in FIG. 13, the high-holding-angle roll 41 has a shaft support 411 at one end in the width direction supported by a linear motion guide (hereinafter referred to as LM guide) 412, and the shaft support 411 The LM guide 412 is configured to be movable along the transport direction. However, the configuration capable of adjusting the alignment may be provided on at least one of the high-holding-angle roll 41 and the transporting roll 4 adjacent to the high-holding-angle roll 41. It goes without saying that the LM guide 412 can be finely adjusted and can be fixed without deviation after adjustment.

  As described above, at least one high-holding-angle roll 41 that is in contact with the thin film glass G at a holding angle θ of 40 degrees or more and the other transporting rolls 4 adjacent to the high-holding-angle roll 41 are the two transports. A length ratio ΔL / L between the difference ΔL in the conveyance direction lengths L1 and L2 at both ends in the width direction of the thin film glass G stretched between the rolls 4 and the average length L of the conveyance direction lengths L1 and L2. Is controlled to be 0.005 or less, it is possible to suppress the progress of cracks at the end in the width direction of the thin film glass G due to the poor roll axis parallelism of the two transport rolls 4. it can. Therefore, damage to the thin film glass G at the time of conveyance can be suppressed.

  In addition, since at least one of the high holding angle roll 41 and the conveying roll 4 adjacent to the high holding angle roll 41 is configured so that alignment adjustment is possible, the roll axis parallelism between these conveying rolls 4 Even when the deviation is large, it is possible to adjust the alignment of the at least one transport roll 4 so that the length ratio ΔL / L is 0.005 or less.

  The embodiments to which the means 8 to 15 can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the scope of the invention.

  For example, in the above embodiment, ΔL is obtained as the difference between the conveyance direction lengths L1 and L2 at both ends in the width direction of the thin film glass G. However, as shown in FIG. On the basis of the conveyance direction lengths L3 and L4 at the four ends, ΔL may be obtained by the following equation.

ΔL = | L3-L4 | × Lw / Lr
However, Lw is the width of the thin film glass G, and Lr is the length of the transport roll 4.

  The outer diameter of the transport roll 4 is not particularly limited, but is preferably 100 mm or more. If the outer diameter of the transport roll 4 is 100 mm or more, the influence of the bending of the transport roll 4 on the damage of the thin film glass G can be discussed only by the size of the holding angle θ of the transport roll 4. .

  In addition, in order to further stabilize the conveyance of the thin film glass G, a tension detection unit capable of detecting the tension in the conveyance direction of the thin film glass G is provided, and when the tension detection unit detects a predetermined tension, It is preferable that the conveyance of the thin film glass G is prevented in advance by stopping the conveyance or adjusting the position of the conveyance roll 4. Further, it is more preferable that the tension detecting means can detect a tension difference at both ends in the width direction of the thin film glass G. As such a tension detecting means, a conventionally known one, for example, a strain gauge provided on the transport roll 4 can be used.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to this example.

  First, the invention constituted by the means 1 to 7 will be described with reference to examples (Examples 1 and 2).

Example 1
In Example 1, as shown in FIG. 5, five conveyance rolls 4 (hereinafter referred to as first roll 4a to fifth roll 4e) are arranged so as to alternately contact with both main surfaces of the thin film glass G. In the transport system, the breakage (breakage) of the thin film glass G when the transport roll 4 is changed to various types including those described in the above embodiment and the thin film glass G is repeatedly unwound and wound. confirmed.

<Conveyance conditions>
Each transport roll 4 was assumed to have an outer diameter of 200 mm, and was arranged so that the holding angle was 90 degrees. The conveyance speed was constant at 5 m / min. Moreover, each conveyance roll used the roll shown in Table 1 in consideration of the relationship with respect to a thin film glass width other than a shape.

  Further, the feeding roll 2 was disposed immediately before the five transport rolls 4, and the winding roll 3 was disposed immediately after the five transport rolls 4. For winding the thin-film glass G, PET having a thickness of 38 μm was used as a slip sheet.

<Thin glass>
As the thin-film glass G, borosilicate glass having been cut in advance in the width direction with a CO ₂ laser was used. The shape of the thin film glass G was 50 m in total length, 70 μm in thickness, and 400 mm in width. However, in some tests (Test 16 in Table 1), both ends (in a range of 7 mm from both edges) were etched with hydrofluoric acid (side edges were etched with 15% concentration hydrofluoric acid). The etching amount was about 5 μm at a time in the glass thickness direction (up and down).

  The merit of the etching treatment with hydrofluoric acid is that the original strength of the glass can be maintained without increasing new microcracks on the treated surface. In addition, mechanical polishing can be mentioned as another means for reducing the thickness of the glass edge. However, since microcracks are likely to be newly increased on the polished surface and the original strength of the glass is greatly reduced, it is a more desirable processing means. That's not true.

<Results and summary>
The results are shown in Table 1. From this table, it is possible to suitably suppress breakage of the thin film glass G during transport by using the various transport rolls 4 described in the above embodiment, or by using the thin film glass G that is etched at both ends a. I understand.

  In FIG. 6 (d) shown as a specific roll form of the roll of FIG. 3 (d), A is a stainless steel core part, B is a low elastic rubber (JIS A 40 degrees made by NBR) (meat It is a layer having a thickness of 74 mm) for providing an elastic function, and the surface is further made of a fluorine-based heat shrinkable tube (with finish polishing: wall thickness: 1 mm) C to provide glass slip resistance.

Example 2
In Example 2, in order to verify the result of Example 1 from a different angle, a glass piece (thin film G) whose both ends are cut with a CO2 laser is physically bonded to vinyl chloride resin or glass. The substitute evaluation method to contact was implemented, and the strength reduction | decrease behavior of the thin film glass G was measured.

  Specifically, in a state where a glass piece (thin film G) to be evaluated for strength is sandwiched between contact objects (vinyl chloride plate or glass plate), a one-kg operation is performed on a roll of 1 kg on the glass piece and a uniform load treatment is performed. went. This method was used as a substitute evaluation assuming a state where the glass and the contact object are in surface contact. As a means for grasping the breaking strength, a three-point bending evaluation method for measuring the strength of a ceramic resin or the like was used.

<Results and summary>
The result of calculating the breaking strength from the radius of curvature at the time of breaking the glass piece is shown in FIG. From this figure, it can be seen that the strength of glass decreases even if it comes into plane contact with a material having a lower hardness than itself, such as a vinyl chloride plate. Further, when glass is brought into flat contact with a glass plate having a higher hardness than that of a vinyl chloride plate, the strength is greatly reduced. Therefore, in order to prevent a reduction in strength of the thin film glass G and suppress the occurrence of breakage, it is preferable to bring the thin film glass G into contact with the transport roll 4 having a low hardness as much as possible, and more preferable not to contact the transport roll 4. It can be said.

  The invention constituted by the means of 8 to 15 will be specifically described below by giving examples.

Example 3
In Example 3, as shown in FIG. 14, in the transport system in which the high holding angle roll 41 is sandwiched between the two transport rolls 4, the thin film glass G when the length ratio ΔL / L is changed under the following conditions: Damage (rupture) status was confirmed.

<Transport roll>
All the conveyance rolls 4 including the high holding angle roll 41 were made of vinyl chloride having an outer diameter of 180 mm. Further, the holding angles θ1 and θ2 of the conveying rolls 4 on the upstream side and the downstream side of the high holding angle roll 41 are set to 38 °, and the holding angle θ3 of the high holding angle roll 41 is set to be easily cracked 180 °.

<Thin glass>
As the thin glass G, a glass resin having a polyester resin film connected to the front end in the longitudinal direction was used, and the glass portion passed through each transport roll 4 after the film portion was in a stable transport state. Moreover, the conveyance direction tension | tensile_strength of the thin film glass G was hold | maintained at 32 N / m by the conversion value of 1 m width. The thickness and width of the thin film glass G are shown in Table 2 together with the results.

<Result>
The results are shown in Table 2. In the table, the symbols in the “presence / absence of breakage” column respectively indicate the following contents. Moreover, all the thin film glasses G in which damage was confirmed were damaged on the long span side where the length in the conveyance direction was long among both ends in the width direction.

  As for the occurrence rate of breakage, only the case of × where the thin film glass was broken immediately after passing through the high-angled roll 41 was counted as breakage, and the occurrence rate at each of the 6 levels was marked as%.

Damage occurrence rate = number of occurrences / 6 x 100 (%)
○: No damage was observed in the thin film glass.

  (Triangle | delta): After thin film glass passed the high holding angle roll 41, it broke after a while.

  X: The thin film was damaged immediately after passing through the high holding angle roll 41.

<Summary>
From the results of Table 2, FIG. 15 shows a summary of the presence or absence of breakage, and FIG. 16 shows a summary of the relationship between the length ratio ΔL / L and the breakage occurrence rate. From these figures, it can be seen that by setting the length ratio ΔL / L to 0.005 or less, and more preferably 0.002 or less from Table 2, breakage of the thin film glass G can be suitably suppressed. Moreover, it turns out that the damage of the thin film glass G can be suppressed more reliably by making (DELTA) L into 1.5 mm or less from the same figure.

Example 4
In Example 4, the transport system of FIG. 14 is used, and the holding angles θ1 and θ2 are fixed at 38 degrees and the holding angle θ3 is changed under the condition that the length ratio ΔL / L is constant. Damage (rupture) status was confirmed.

<Transport roll>
All the conveyance rolls 4 including the high holding angle roll 41 are the same as those in the third embodiment. Further, the alignment of each of these transport rolls 4 is adjusted so that the average length L is 600 mm, ΔL is 3.0 mm, and ΔL / L is constant at two levels of 0.005 and 0.006. Went.

<Thin glass>
The same thin film glass G as in Example 3 was used, and the conveyance direction tension was also set to the same value. The thickness and width of the thin film glass G are shown in Table 3 together with the results.

<Result>
The results are shown in Table 3 (ΔL / L = 0.005) and Table 4 (ΔL / L = 0.006). Note that the symbols in the column of “presence / absence of damage” in the table indicate the same contents as in the same column in Table 2. Moreover, all the thin film glasses G in which damage was confirmed were damaged on the long span side where the length in the conveyance direction was long among both ends in the width direction.

  The breakage rate was counted as breakage only in the case of x where the thin film glass was broken immediately after passing through the high-angled roll 41, and the occurrence rate at each of the two levels was marked as%.

<Summary>
From the results of Tables 4 and 3, from the results of the damage level (Table 4) when the holding angle θ of the front and rear transport rolls 4 is fixed at 38 degrees and the length ratio ΔL / L is set to 0.006, In the case of forming a transport system in which the transport rolls 4 are arranged, when each holding angle θ is less than 40 degrees, no damage occurs, but in a region where the holding angle θ is 40 degrees or more, Although the thin film glass was broken immediately after passing through the high-angled-angle roll 41, it was broken including those broken after a while, but the length ratio ΔL / L was set to 0.005. In the case (Table 3), it can be seen that breakage does not occur or is reduced even when the holding angle θ of the high holding angle roll 41 is 40 degrees or more.

1, 1A Conveying device 2 Feeding roll 3 Winding roll 4 Conveying roll 4a First circumferential surface portion 4b Second circumferential surface portion 41 High holding angle roll (one conveying roll)
412 LM Guide 5 Film processing part G Thin film glass a Both ends (width direction both ends)
b Inner part (width direction inner part)
L1, L2 The length in the conveyance direction at both ends in the width direction of the thin film L The average length of the conveyance direction lengths L1, L2 ΔL The difference between the conveyance direction lengths L1, L2 ΔL / L Length ratio θ Holding angle

Claims (7)

In the thin film glass transport device that transports the long thin film glass with a plurality of transport rolls along the longitudinal direction,
The plurality of transport rolls are, on the peripheral surface of the transport roll, a width direction inner side portion of the thin film glass excluding the width direction both end portions from a first peripheral surface portion facing the width direction both end portions of the thin film glass. The thin film glass conveying device is configured such that the second peripheral surface portion opposed to the thin film glass is in contact with the thin film glass with a larger contact pressure. In the thin film glass transport device that transports the long thin film glass with a plurality of transport rolls along the longitudinal direction,
The plurality of transport rolls are configured such that, of the peripheral surfaces of the transport rolls, the first peripheral surface portions facing both ends in the width direction of the thin film glass are not in contact with the thin film glass. The conveyance apparatus of the thin film glass of Claim 1.   The transport of thin film glass according to claim 1, wherein the first peripheral surface portion is subjected to a surface treatment that makes the first peripheral surface portion have a lower hardness than the second peripheral surface portion. apparatus. In the transport method of thin film glass that transports long thin film glass with a plurality of transport rolls along the longitudinal direction,
The plurality of transport rolls are, on the peripheral surface of the transport roll, a width direction inner side portion of the thin film glass excluding the width direction both end portions from a first peripheral surface portion facing the width direction both end portions of the thin film glass. A method of transporting a thin film glass, characterized in that the second peripheral surface portion opposed to the thin film glass is in contact with the thin film glass with a larger contact pressure. In the transport method of thin film glass that transports long thin film glass with a plurality of transport rolls along the longitudinal direction,
5. The thin film according to claim 4, wherein among the peripheral surfaces of each transport roll, a first peripheral surface portion facing both ends in the width direction of the thin film glass is configured not to contact the thin film glass. Glass transport method.   As the thin film glass, the peripheral surface is stepped so that both ends in the width direction of the peripheral surface that comes into contact with the plurality of transport rolls at the time of transport are lower than the inner portion in the width direction excluding the both ends in the width direction. The method for transporting thin film glass according to claim 5, wherein the thin film glass is used.   The plurality of transport rolls, wherein the first peripheral surface portion is subjected to a surface treatment that makes the first peripheral surface portion have a lower hardness than the second peripheral surface portion. 4. The method for transporting thin film glass according to 4.