JP2011144093A - Method and apparatus for manufacturing plate-like glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the track of an effective glass part and the track of an end edge glass part after cutting suitable to the track of a belt-shaped plate-like glass before cutting, in dividing the effective glass part and the end edge glass part by continuously cutting the end edge part of the width direction in the belt-shaped plate-like glass. <P>SOLUTION: The apparatus includes a forming zone A1 which forms a molten glass Gm into a belt-shaped plate-like glass G, an annealing zone B1 which makes the internal strain not to produce in an effective glass part Ga of the plate-like glass G and a cooling zone C1 which cools the plate-like glass G, and in the constitution which continuously cuts the end edge part of the width direction while feeding the belt-shaped plate-like glass G which is passed through the cooling zone C1 and divides into the effective glass part Ga and the end edge glass part Gb, a change degree of the track of the effective glass part Ga is set up so that it becomes larger than the change degree of the track of the end edge glass part Gb on the basis of the extended line of the track of the belt-shaped plate-like glass G before cutting. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, a plate-shaped glass sheet that has undergone an annealing process and a cooling process after molding is continuously cut at the edge in the width direction, and is divided into an effective glass part and an edge glass part. The present invention relates to a glass manufacturing method and an apparatus therefor.

  As is well known, in recent years, the mainstream of video display devices is a flat panel display (FPD) represented by a liquid crystal display (LCD), a plasma display (PDP), a field emission display (FED), an organic EL display (OLED), and the like. It has become. Since the weight reduction of these FPDs is promoted, the glass substrate used for the FPD is currently being thinned.

  In addition, organic EL is being used as a planar light source such as a backlight of an LCD or a light source for indoor lighting by causing only three colors (for example, white) to emit light without causing the TFT to flicker the three primary colors unlike a display. In addition, since the organic EL lighting device can freely deform the light emitting surface if the glass substrate has flexibility, the glass substrate used in this lighting device is also sufficiently flexible. From the standpoint of securing, a significant reduction in thickness (glass film) is being promoted.

  A method of cutting (or cleaving) a glass substrate used in these FPDs and lighting devices includes a scribe process in which a scribe of a predetermined depth is engraved on the front surface or the back surface of the glass substrate, and a scribe is performed after the execution of this process. Generally, it is composed of a breaking step of dividing the glass substrate by applying a bending moment so as to straddle it.

  As an improvement example of this type of glass substrate cutting method, according to Patent Document 1, a strip-shaped plate glass is drawn vertically downward from a hot forming apparatus through a vertical zone, and the traveling direction of the strip-shaped plate glass ( (Orbit) is changed in the folding zone and moved from the folding zone to the horizontal zone where the glass sheet is directed horizontally, and the edge in the width direction of the glass sheet is continuously cut using a laser beam. Is disclosed.

  Further, according to the same document, the traveling direction of the edge (after the edge part including the ear part) after cutting the band-shaped plate glass is changed so as to be directed vertically downward in the horizontal zone, and at the lower end. After cutting in the width direction and disposing of it, the edge of the strip-shaped glass sheet after cutting is cut off and the remaining effective glass part is sent as it is in the horizontal direction without changing the traveling direction. It is disclosed that a glass plate as a product is obtained by cutting to a predetermined length.

JP 2000-335928 A

  By the way, the manufacturing method of the glass plate disclosed by patent document 1 cuts and divides | segments the edge part of a strip | belt-shaped plate-shaped glass continuously in a horizontal zone, Then, the advancing direction (orbit) of the edge part When the glass plate is formed by the overflow down draw method, the following changes are made from the horizontal direction to the vertical downward direction, while the remaining glass is conveyed without changing the traveling direction of the effective glass portion. The problem shown will occur.

  That is, the edge of the band-shaped plate glass formed by the overflow downdraw method is a kind of glass thickness abnormal part, and usually the thickness of the edge is thicker than the thickness of the effective glass part, The edge portion is in a state having a large internal stress due to a difference in speed during cooling and then shrinkage when forming a band-shaped plate glass from molten glass. Thus, when cutting and removing the edge portion that is in a state of low flexibility and internal stress due to the abnormally thick glass thickness, it is necessary to pay great attention to the handling of the edge portion. There is. In addition, even when it is a case where strip | belt-shaped plate glass is shape | molded by the float glass process, since the edge part of a strip | belt-shaped plate glass is thicker than an effective glass part, the process after cut | disconnecting an edge part is patent document 1 Similar precautions should be taken when doing as described in.

  More specifically, in the case of processing the edge part as disclosed in Patent Document 1 in a glass having a thick glass edge and a low flexibility, it is expected to bend only by gravity applied to the edge part. The bending radius becomes very large, and the occupation space as a production line has to be increased, resulting in a layout disadvantage. On the other hand, in order to forcibly change the traveling direction of the end edge by forcing the bending radius to be small, it is necessary to provide a mechanism for pushing the end edge downward, resulting in complicated equipment. Further, bending the thick edge portion causes breakage of the edge portion, and the damage of the edge portion acts on the starting point of cutting, leading to damage to the entire strip-shaped plate glass. There is a risk of tightening.

  In view of the above circumstances, the present invention provides a strip-like plate-like glass before cutting when the edge in the width direction of the strip-like plate-like glass is continuously cut to be divided into an effective glass portion and an edge glass portion. It is a technical problem to optimize the path of the effective glass part and the edge glass part after cutting with respect to the track of the metal to make the crack progress from the cutting start point into a suitable state.

  Invented in order to solve the above technical problem, the present invention has a molding step of forming molten glass into a strip-shaped plate glass, and internal strain occurs in the effective glass portion of the strip-shaped plate glass that has undergone the molding step. An annealing process for preventing the sheet, a cooling process for cooling the strip-shaped glass sheet that has undergone the annealing process, and an edge in the width direction are continuously cut while feeding the strip-shaped glass sheet that has undergone the cooling process. Then, in the method for producing a sheet glass comprising a cutting step of dividing into an effective glass part and an edge glass part, in the cutting step, an extension line of the band-like sheet glass orbit before cutting is used as a reference. The change degree of the trajectory of the effective glass part is characterized by being larger than the change degree of the trajectory of the edge glass part. Here, the above-mentioned “orbit” means a state in which the band-shaped plate-shaped glass, the effective glass portion, and the edge glass portion before cutting proceed while being curved or go straight, and their glass surfaces. A trajectory viewed along a direction perpendicular to the traveling direction. In addition, the “edge glass portion” is a portion including the ear portion at the edge.

  According to such a configuration, by continuously cutting the edge portion in the width direction in the cutting step for the band-shaped plate glass that has undergone the forming step, the annealing step, and the cooling step, When dividing into an effective glass part and an edge glass part on the outer side thereof, the degree of change in the orbit of the edge glass part relative to the orbit of the band-shaped plate glass is smaller than the degree of change in the orbit of the effective glass part. Become. In other words, the degree of bending of the edge glass portion is smaller than the degree of bending of the effective glass portion, and the relationship between the degree of bending of the former and the latter is reversed. As a result, the edge glass portion that is relatively thick and low in flexibility and has a large internal stress at the stage of performing the forming process, annealing process, cooling process, and cutting process is relatively thin. Therefore, as compared with an effective glass portion having high flexibility and low internal stress, the glass advances relatively in a straight line through before and after cutting. Therefore, even if the effective glass part changes its traveling direction relatively largely before and after cutting, the cutting direction of the band-shaped plate glass is derived from the fact that the traveling direction of the edge glass part does not change relatively. Unjust stress concentration, vibration, and the like are less likely to occur at the crack bottom end. As a result, the probability that the crack will break off the planned cutting line and the probability that the crack spreads throughout the strip-shaped glass sheet will be reduced, and the quality improvement of the finally obtained glass sheet product can be expected. The productivity will be greatly improved.

  In this case, it is preferable that the track of the edge glass portion is the same or substantially the same as the extension line of the track of the strip-shaped plate glass before the cutting.

  In this way, the edge glass portion moves straight or substantially straight before and after cutting, so that the edge glass portion is not greatly bent through before and after cutting, thereby cutting the strip-shaped plate glass. It is possible to more reliably avoid a situation in which unreasonable stress concentration or vibration occurs at the starting point.

  Moreover, it is preferable that the branch start position of the track | orbit of the said effective glass part and the track | orbit of the said edge glass part exists in the position which separated the separation dimension within 1000 mm from the cutting start point.

  That is, after the strip-shaped plate glass is cut, both the tracks are branched due to the difference between the track of the effective glass portion and the track of the edge glass portion. In this case, if the branch start position is present at a position separated by a separation dimension within 1000 mm (preferably within 500 mm) from the cutting start point, both cutting surfaces of the effective glass portion and the edge glass portion come into contact with each other. While being sent, the distance sent can be shortened appropriately. As a result, damage to the cut end faces and generation of microcracks due to the cut surfaces of both glass portions coming into contact with each other over an unreasonably long distance can be suppressed, and in particular, a decrease in strength against bending of the effective glass portion can be avoided.

  In this case, it is preferable that a lower limit value of a separation dimension from the cutting start point to the branch start position is 100 mm.

  That is, if the branch start position of the track of the effective glass portion and the track of the edge glass portion is too close to the cutting start point, the effective glass portion or the edge glass portion in addition to the stress inherently necessary for thermal stress full body cleaving There is a possibility that stress (tearing force) caused by bending of the wire will undesirably act on the cutting start point and hinder accurate progress of the crack from the cutting start point. Therefore, if the separation dimension from the cutting start point to the branch start position is set to 100 mm or more (preferably 200 mm or more), such a problem hardly occurs.

  In the above configuration, the distance from the branch start position on the virtual extension line along the trajectory of the strip-shaped plate glass before the cutting is A / tan 1 °, where A is the plate thickness of the effective glass portion. When the position is a branch reference position, an angle formed between a tangent line from the branch reference position to the track of the effective glass part and a tangent line from the branch reference position to the track of the edge glass part is 1 to 45 °. It is preferable that

  That is, if the angle formed by the two tangents is 1 ° or more, the distance between the effective glass portion and the edge glass portion after cutting can be appropriately shortened, so that there is a defect in the cut surface of both the effective glass portions. It is possible to suppress the occurrence of the strength reduction and prevent the effective glass portion from being contaminated by the fine glass powder generated by the contact between the two. Further, if the angle formed by the two tangents is 45 ° or less, it is possible to control accurately so that excessive force does not act on the starting point of cutting and the progress of cracks from the starting point of cutting does not deviate from the planned cutting line. It becomes possible. Therefore, if the angle formed by the two tangents is within the above numerical range, such advantages can be enjoyed effectively.

  Furthermore, in the above configuration, in the cutting step, after forming an initial crack on the planned cutting line of the strip-shaped plate glass before the cutting, with local heating along the planned cutting line and cooling to the heating region It is preferable to cause the initial crack to progress and to cut the sheet glass full-body by the generated stress.

  In this case, stress (thermal stress) is generated as the heating region by local heating and the cooling region by cooling the heating region are scanned along the planned cutting line for the band-shaped plate glass before cutting. The generation region of the metal also moves along the planned cutting line, whereby the initial crack propagates along the planned cutting line, and the plate-like glass is fully cut (full cut). Therefore, the operation | work which divides | segments a strip | belt-shaped plate-shaped glass into an effective glass part and an edge glass part can be performed correctly and easily along a cutting projected line.

  In this case, the local heating is preferably performed by a carbon dioxide laser.

  In this way, if a carbon dioxide laser is used as a local heating means for the planned cutting line of the plate glass, the glass (especially non-alkali glass) can efficiently absorb the energy of the laser, so that local heating can be performed in a stable state. This can be done and the cost is low. In addition, as a cutting | disconnection method, the method of breaking after putting a scribe can also be employ | adopted.

  Furthermore, in the above configuration, it is preferable that the forming step, the annealing step, and the cooling step are performed by a downdraw method.

  In this way, the traveling direction of the belt-like plate glass sent from the forming process through the annealing process and the cooling process is directed vertically downward, so cutting work and other work by effectively using this directionality. The above-described advantages can be enjoyed while executing the above. Note that the float method is not excluded as a forming method. Of the downdraw methods, the overflow downdraw method is more preferable.

  In this case, it is preferable to arrange | position the cutting zone which performs the said cutting process vertically below the cooling zone which performs the said cooling process.

  In this way, the cutting zone is arranged vertically below the cooling zone, thereby facilitating the work of cutting and dividing the effective glass portion and the edge glass portion while feeding the band-shaped plate glass. And is advantageous in terms of layout.

  Moreover, in the above structure, you may make it include the process of winding up the said effective glass part in a roll shape around a winding core, cutting the said strip | belt-shaped plate glass continuously.

  In this way, the strip-shaped plate-like glass is continuously cut, and the effective glass portion after cutting is wound around the winding core in a roll shape. Storage and packing can be performed in a compact and easy manner, continuity of work is ensured, and work efficiency is improved.

  Furthermore, in the above configuration, it is preferable that the effective glass portion has a thickness of 200 μm or less.

  That is, when the thickness of the effective glass portion is 200 μm or less, the work of winding around the core in a roll shape can be easily performed, and storage and packing can be performed very smoothly.

  If the above method is used, a plate-like glass having two opposite sides cut by the method and having a thickness of 200 μm or less can be obtained.

  This plate-like glass, that is, a glass film, can withstand strong tensile stress due to bending with a small radius of curvature due to its high bending strength, and can be used in a wider range of fields than before. In addition, it becomes excellent in handleability.

  Further, if the above method is used, a plate-like glass is obtained in which two opposing sides are cut by the method and the bending strength of the cut surface is 200 MPa or more and the thickness is manufactured to 200 μm or less. Can do.

  Since this plate-like glass, that is, a glass film, has a bending strength of a cut surface of 200 MPa or more, it can reliably withstand a stronger tensile stress due to bending with a smaller radius of curvature and the like, and has a high value of 200 MPa or more. By clarifying the bending strength as a value, the handling of this sheet glass can be embodied in an appropriate manner.

  Furthermore, if the above method is used, the plate-shaped glass winding body by which the effective glass part after a cut | wound is wound around the winding core at roll shape can be obtained.

  According to this plate-shaped glass wound body, storage and handling are facilitated, and transportation efficiency is also improved. In addition, while carrying out a method (roll to roll) of drawing out a belt-like plate-like glass from one plate-like glass wound body and rolling it around another core, a cutting planned line extending in the longitudinal direction The process in the case of full body cutting along can be performed smoothly and easily.

  The apparatus according to the present invention, which has been created to solve the above technical problem, includes a forming zone for forming molten glass into a strip-shaped plate glass, and an effective glass portion of the strip-shaped plate glass that has passed through the forming zone. An annealing zone that prevents distortion, and a cooling zone that cools the strip-shaped glass sheet that has passed through the annealing zone, while feeding the strip-shaped glass sheet that has passed through the cooling zone, the edge in the width direction In the sheet glass manufacturing apparatus configured to be continuously cut and divided into an effective glass part and an edge glass part, with reference to an extension of the orbit of the band-shaped sheet glass before cutting, It is characterized in that the change degree of the trajectory of the effective glass part is set to be larger than the change degree of the trajectory of the edge glass part.

  The explanation items including the operational effects of the apparatus having this configuration are essentially the same as those described for the above-described method according to the present invention having substantially the same components as the apparatus.

  As described above, according to the present invention, the edge glass is relatively thick, has low flexibility, and has a large internal stress at the stage of performing the forming process, the annealing process, the cooling process, and the cutting process. As compared with the effective glass portion, which is relatively thin, flexible, and has low internal stress, the portion proceeds in a state that is relatively straight ahead through before and after cutting. Therefore, even if the effective glass part changes its traveling direction relatively largely before and after cutting, the cutting direction of the band-shaped plate glass is derived from the fact that the traveling direction of the edge glass part does not change relatively. Unsatisfactory stress concentration and vibration are less likely to occur. As a result, the probability that the crack will break off the planned cutting line and the probability that the crack spreads throughout the strip-shaped glass sheet will be reduced, and the quality improvement of the finally obtained glass sheet product can be expected. The productivity will be greatly improved.

It is a schematic front view which shows the implementation condition of the manufacturing apparatus of the plate glass which concerns on 1st Embodiment of this invention, and its manufacturing method. It is a principal part perspective view which shows the implementation condition of the manufacturing apparatus of the sheet glass which concerns on 1st Embodiment of this invention, and its manufacturing method. It is a principal part perspective view which shows the implementation condition of the manufacturing apparatus of the sheet glass which concerns on 1st Embodiment of this invention, and its manufacturing method. It is a schematic front view which shows the implementation condition of the manufacturing apparatus of the plate glass which concerns on 2nd Embodiment of this invention, and its manufacturing method. It is a schematic front view which shows the implementation condition of the manufacturing apparatus of the plate glass which concerns on 3rd Embodiment of this invention, and its manufacturing method. It is the schematic which shows the state which is evaluating plate glass.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following embodiments, a sheet glass having a thickness of 200 μm or less used for an FPD, an organic EL lighting device, or a solar cell is targeted.

  FIG. 1 is a schematic front view showing a state of implementation of the sheet glass manufacturing apparatus and method according to the first embodiment of the present invention. As shown in the figure, this manufacturing apparatus 1 performs an overflow downdraw method, and supplies molten glass Gm to a molded body 3 provided in a molding furnace 2 and also supplies the molten glass Gm. A belt-shaped plate glass G is produced while overflowing and flowing down from the molded body 3. More specifically, the manufacturing apparatus 1 has a molding furnace storage chamber R1 at an upper end, and a molding furnace 2 for molding the molten glass Gm into a strip-shaped plate glass G in the molding furnace storage chamber R1, The annealing furnace 4 connected vertically below the forming furnace 2 is accommodated, and the lower end opening of the annealing furnace 4 is located at the upper end of the cooling chamber R2 provided continuously below the forming furnace accommodating room R1. The cutting chamber R3 is arranged continuously below the cooling chamber R2. Accordingly, the manufacturing apparatus 1 includes, in order from the top, a forming zone A1 for performing a forming step of forming the molten glass Gm into the strip-shaped plate glass G, and the strip-shaped plate glass G that has passed through the forming zone A1. A slow cooling zone B1 for performing an annealing process for preventing an internal stress from being generated in the effective glass portion, a cooling zone C1 for cooling the strip-shaped plate glass G that has passed through the slow cooling zone B1 to near room temperature, A cutting zone D1 is provided that cuts the band-shaped plate glass G that has passed through the cooling zone C1 at the edge portion in the width direction and divides it into an effective glass portion Ga and an edge glass portion Gb.

  In the cutting zone D1, a laser beam L is irradiated in the lateral direction from the surface side to the edge in the width direction (both edges) of the strip-shaped glass sheet G that is continuously sent vertically downward to perform local heating. The local heating means 5 to be applied and the cooling means 6 for injecting the cooling water W in the lateral direction from the surface side to the heating region H heated by the local heating means 5 are arranged. In this embodiment, a carbon dioxide laser is used as the local heating means 5, but it may be a means capable of performing other local heating such as heating wire or hot air injection. The cooling means 6 injects the cooling water W as a refrigerant by air pressure or the like. This refrigerant is a cooling liquid other than the cooling water, a gas such as air or an inert gas, or a gas and a liquid. Further, a mixture of a solid such as dry ice or ice and a liquid or gaseous fluid may be used.

  In this case, as shown in FIG. 2, the band-like plate glass G has the planned cutting lines 7 at both end edges in the width direction (virtually present), and is due to laser irradiation of the local heating means 5. About the heating area H and the cooling area C by the cooling water jet of the cooling means 6, the heating area H precedes the cooling area C as the sheet glass G is continuously fed downward. The cutting target line 7 is scanned from the tip side of the glass sheet G. And since the initial crack 8 is formed by the crack formation means (crack provision means) outside a figure on the cutting projected line 7 in the front-end | tip part of the said sheet glass G, the above-mentioned heating area | region H and cooling area | region C Due to the stress (thermal stress) generated during the scanning, the initial crack 8 progresses, whereby a cut surface penetrating from the front surface to the back surface is formed on the planned cutting line 7 while progressing. As a result, the strip-shaped plate glass G is continuously divided into the effective glass portion Ga and the edge glass portion Gb including the ear portion Gb1. In addition, according to the figure, although the initial crack 8 is formed in the front-end | tip part on the cutting projected line 7 in the surface of the sheet glass G, this initial crack 8 is from the surface front-end | tip part of the sheet glass G. It may be formed over the end face.

  After the strip-shaped plate glass G is cut along the planned cutting line 7 (full body thermal stress cleaving) in the manner as described above, the effective glass portion Ga has a large traveling direction as shown in FIG. The edge glass portion Gb is sent vertically downward or substantially vertically downward with almost no change in the traveling direction. That is, after the cutting of the belt-shaped plate glass G, the degree of change in the trajectory of the effective glass portion Ga with respect to the trajectory before the cutting becomes larger than that of the edge glass portion Gb.

  In this case, as shown in FIG. 3, the branch start position 9 between the trajectory of the effective glass portion Ga and the trajectory of the edge glass portion Gb is a position separated from the cutting start point 10 by a separation dimension La of 100 mm or more and within 1000 mm. Exists. And when thickness of the effective glass part Ga is set to A, the separation dimension Lb from the branch start position 9 on the virtual extension surface along the track | orbit of the strip | belt-shaped plate-shaped glass G before a cutting | disconnection is A / tan1 degree. Assuming that a certain position is the branch reference position 11, the angle α formed by the tangent line from the branch reference position 11 to the orbit of the effective glass portion Ga and the tangent line from the branch reference position 11 to the orbit of the edge glass portion Gb is 1 It is set to be ~ 45 °.

  As shown in FIG. 1, the edge glass portion Gb divided from the belt-like plate glass G in such a manner passes through the cutting chamber R3 (cutting zone D1) in the vertical direction, and then in the width direction. It is cut and dropped in the downward direction x to be disposed of. On the other hand, after the divided effective glass portion Ga is smoothly curved by the conversion roller 12 and sent in the lateral direction, it is sucked and held on the conveyor belt 14 of the conveyor 13 by negative pressure or the like, and the cutting chamber R3 ( While being carried out from the cutting zone D1), it is continuously fed in the direction of arrow a. After this, in the state where the band-shaped protective sheet 16 made of an organic resin sheet or the like drawn out from the sheet roll 15 is overlapped on the surface side of the effective glass portion Ga, the core 18 of the winding device 17 It is rolled up around the roll. And the effective glass part Ga is cut | disconnected by the width direction when the roll outer diameter becomes a predetermined value. This cutting is performed, for example, by putting a scribe in the width direction of the effective glass part Ga and breaking (breaking) with a cutter. Further, the protective sheet 16 is also cut in the width direction at the same position by another cutting means. As a result, a roll-shaped plate-shaped glass wound body is obtained as a final product in which the protective sheet 16 also serves as a buffer material for the effective glass portion Ga. In addition, the final product here does not need to be a roll-shaped plate glass winding body, and may be a glass plate laminated body formed by laminating rectangular glass plates as described later.

  When a plate-shaped glass wound body or a glass sheet laminate is manufactured through the above process, a forming step in the forming zone A1, an annealing step in the slow cooling zone B1, and a cooling step in the cooling zone C1 are performed. The strip-shaped plate glass G that has passed is continuously cut at the edge in the width direction in the cutting step in the cutting zone D1, and the effective glass portion Ga at the center portion and the edge glass portion on the outer side thereof. It is divided and sent to Gb. In that case, the bending degree of the edge glass part Gb is zero or substantially zero, whereas the bending degree of the effective glass part Ga is increased. Thereby, at the stage where the forming process, annealing process, cooling process, and cutting process are executed, the edge glass portion Gb that is relatively thick and has low flexibility and a large internal stress is relatively Compared to the thin glass, high flexibility, and small effective internal glass portion Ga, it progresses in a relatively straight state through before and after cutting. Therefore, even if the effective glass part Ga changes the traveling direction relatively largely through before and after cutting, the cutting start point of the band-shaped plate glass is derived from the fact that the traveling direction of the edge glass part Gb does not change relatively. 10 is not likely to cause unreasonable stress concentration or vibration. As a result, the probability that the cracks progress outside the planned cutting line 7 and the probability that the cracks spread to the entire belt-shaped plate glass G will be reduced, and the quality of the finally obtained glass plate product will be improved. As a result, productivity can be greatly improved.

  Moreover, since the branch start position 9 of the track | orbit of the effective glass part Ga and the track | orbit of the edge glass part Gb exists in the position which separated the separation dimension La within 1000 mm from the cutting start point 10, effective glass part The distance at which both cut surfaces of Ga and edge glass portion Gb are likely to contact each other can be appropriately shortened, so that the cut surfaces of both glass portions Ga and Gb contact each other over an unreasonably long distance. By doing so, damage to the cut surface, generation of microcracks, and the like are suppressed, and in particular, a decrease in strength against bending of the effective glass portion Ga can be avoided. Moreover, the separation distance La from the cutting start point 10 to the branch start position 9 is set to 100 mm or more. This is because, when the branch start position 9 between the trajectory of the effective glass portion Ga and the trajectory of the edge glass portion Gb is too close to the cutting start point 10, in addition to the stress inherent to thermal stress full body cleaving, the effective glass portion This is because the stress (tearing force) caused by bending of Ga or the edge glass portion Gb acts on the cutting start point 10 undesirably and may hinder the accurate progress of the crack from the cutting start point 10. If the separation distance La is set to 100 mm or more, such a problem is hardly caused.

  Further, the branch reference position 11 is defined as a branch reference position 11 where the distance Lb from the branch start position 9 on the virtual extension plane along the trajectory of the band-shaped plate glass G before cutting is A / tan 1 °. The angle α formed by the tangent line extending from the branching reference position 11 to the edge glass portion Gb is set to 1 ° or more. Thereby, the distance which the effective glass part Ga and the edge glass part Gb contact after a cutting | disconnection can be shortened appropriately, and the situation which a defect arises in the cut surface of the effective glass part Ga and causes a strength fall is suppressed especially. In addition, it is possible to effectively prevent contamination of the effective glass portion Ga by the fine glass powder generated by the contact. Further, since the angle α formed by the two tangent lines is set to 45 ° or less, an excessive force does not act on the cutting start point 10 so that the crack progress from the cutting start point 10 does not deviate from the planned cutting line 7. It becomes possible to control accurately.

  Moreover, if the above method is used, two opposing sides are cut (full body thermal stress cleaving), the bending strength of the cut surface is 200 MPa or more, and the thickness is 200 μm or less. Glass can be obtained. Since such a plate glass has a bending strength of the cut surface of 200 MPa or more, it can reliably withstand bending at a smaller radius of curvature and stronger tension, and bend as a high value of 200 MPa or more. The strength becomes clear and the handling of the glass sheet can be embodied in an appropriate manner. Furthermore, if it is a plate-shaped glass winding body obtained using the above method, storage and handling are facilitated, and transportation efficiency is also improved.

  FIG. 4 is a perspective view of the main part showing the state of implementation of the sheet glass manufacturing apparatus and method according to the second embodiment of the present invention. As shown in the figure, the manufacturing apparatus 1 according to the second embodiment differs from the manufacturing apparatus 1 according to the first embodiment described above in that the band-shaped plate glass G that has passed through the cooling zone C1 is converted. Local heating and cooling means by the local heating means 5 in the state of being smoothly held by the roller 12 and fed in the horizontal direction and then sucked and held by the negative pressure or the like on the conveyor belt 14 of the conveyor 13 whose tip side is inclined downward. 6 and the effective glass part Ga after cutting is separated from the conveyor belt 14 of the conveyor 13 by a plurality of conveyor rollers 19 in the lateral direction (horizontal direction). The edge glass portion Gb is sent in the downward inclined direction by the conveyor belt 14. Other configurations, operational effects, and supplementary explanation items are the same as those in the first embodiment described above. Therefore, in FIG. 4, common constituent elements are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 5: is a principal part perspective view which shows the implementation condition of the manufacturing apparatus and its manufacturing method of the glass sheet concerning 3rd Embodiment of this invention. As shown in the figure, the cutting apparatus 1 according to the third embodiment differs from the manufacturing apparatus 1 according to the second embodiment described above in that it passes through the cooling zone C1 and is on the conveyor belt 14 of the conveyor 13. A point where the wheel chip 20 made of cemented carbide or the like is pressed against the adsorbed belt-like plate glass G to continuously engrave the scribe, and the breaker 21 breaks it. The tip portion of the effective glass portion Ga sent away from the belt 14 is cut into a sheet glass Gz having a predetermined length by a cutting device (a wheel chip 22 that engraves a scribe in the width direction and a breaker 23 that performs a break). It is the point which laminated | stacked the plate glass Gz in the flat placing attitude | position, and produced a plate glass laminated body. Other configurations, operational effects, and supplementary explanation items are the same as those of the second embodiment (and thus the first embodiment) described above. Therefore, in FIG. Description is omitted.

In [Example 1] of the present invention, the total width of the sheet glass is 1400 mm, the width of the effective glass portion is 900 mm, the plate thickness of the effective glass portion is 100 μm, and the thermal expansion coefficient at 30 to 380 ° C. is 38 × 10. A strip-like non-alkali glass plate at ^-7 / ° C was fed vertically downward at a feed rate of 12 m / min in the manner shown in FIG. Then, when the strip-like non-alkali glass plate was vertically downward, both edge portions were cut by local heating means and cooling means arranged on the side thereof. In this cutting, an initial crack is made on the cutting line of the strip-like alkali-free glass plate, and then a carbon dioxide laser is used as a local heating means, and an ellipse having a length of 20 mm and a width of 3 mm at an output of 100 w. A laser beam having a shape was irradiated on the planned cutting line, and then, as a cooling means, a full-body cutting was continuously performed while spraying a refrigerant mixed with air and water on the planned cutting line. During cutting, a position separated by 0.1 mm / tan 1 ° or 5.9 mm vertically downward from the cutting starting point is defined as a branch reference position, and a tangent to the effective glass portion and a tangent to the edge glass portion from the branch reference position. The angle formed was adjusted to 1 °. As a result, the strip-like non-alkali glass plate was changed in the direction of travel with a radius of curvature of 500 mm in the lateral direction without breakage, and then an acrylic roll core (core core) having a diameter of 100 mm via a PET film having a thickness of 20 μm ) To obtain a plate-shaped glass wound body. As a result of carrying out the above method, no damage occurred in the edge cutting process while 1000 plate-like wound bodies having a length of 500 m were produced. Further, visual inspection was performed with a light source of 200,000 lux in a dark room, but no generation of glass powder was observed. Further, from the obtained plate-like glass roll, 50 strip-like plate glass samples Sa having a width of 20 mm were collected, and as shown in FIG. 10, these samples Sa were sequentially put into two plates. The strength was evaluated by two-point bending which was sandwiched between the shaped bodies 24 and pushed and bent so as to be bent in the longitudinal direction in a U shape at a speed of 50 mm / min. This evaluation was performed by calculating the breaking strength based on the distance between the two plate-like bodies 24 when broken by pushing and bending. As a result, the fracture strength was extremely good with a minimum value of 200 MPa and an average value of 500 MPa.

In [Example 2] of the present invention, the total width of the sheet glass is 1400 mm, the width of the effective glass portion is 900 mm, the plate thickness of the effective glass portion is 200 μm, and the thermal expansion coefficient at 30 to 380 ° C. is 38 × 10. A strip-like non-alkali glass plate at ^-7 / ° C was fed vertically downward at a feed rate of 9 m / min in the manner shown in FIG. Then, after the cooling step, the strip-like non-alkali glass plate was bent at a radius of curvature of 1500 mm to change the traveling direction, and the tip side downward inclination angle with respect to the horizontal plane was adjusted to 45 °. In such a state, both edge portions were cut by local heating means and cooling means arranged above the strip-like non-alkali glass plate. In this cutting, after making an initial crack on the planned cutting line of the strip-like non-alkali glass plate, a carbon dioxide laser is used as a local heating means, and an elliptical laser spot is placed on the planned cutting line at an output of 50 w. Then, as a cooling means, a full-body cutting was continuously performed while spraying a refrigerant mixed with air and water on the planned cutting line. During cutting, a position separated by 20 mm obliquely downward from the cutting starting point is set as a branch reference position so that an angle formed by a tangent to the effective glass portion and a tangent to the edge glass portion from this branch reference position is 45 °. It was adjusted. After cutting, the edge glass part was disposed of after being sent by a conveyor belt so as to go straight while maintaining an angle of 45 ° with the horizontal plane. On the other hand, the effective glass portion was wound around an acrylic roll core (core) having a diameter of 100 mm through a PET film having a thickness of 20 μm to produce a plate-shaped glass wound body. As a result of carrying out the above method, breakage did not occur in the cutting process of the edge portion while 1000 plate-shaped glass wound bodies having a length of 500 m were produced.

In [Example 3] of the present invention, the total width of the sheet glass is 1400 mm, the width of the effective glass portion is 900 mm, the plate thickness of the effective glass portion is 300 μm, and the thermal expansion coefficient at 30 to 380 ° C. is 38 × 10. A strip-like non-alkali glass plate at ⁻⁷ / ° C. was fed vertically downward at a feed rate of 4 m / min in the embodiment shown in FIG. Then, after the cooling step, the strip-like non-alkali glass plate was bent at a radius of curvature of 2000 mm to change the traveling direction, and the tip side downward inclination angle with respect to the horizontal plane was adjusted to 45 °. In such a state, a scribe was continuously engraved with a pressing force of 2 N by a cemented carbide wheel tip having a blade edge angle of 90 ° arranged above the edge of the strip-like alkali-free glass plate, and then a break occurred. . During cutting, a position separated by 0.3 mm / tan 1 ° or 17.6 mm obliquely downward from the cutting starting point is defined as a branch reference position, and a tangent to the effective glass portion and a tangent to the edge glass portion from the branch reference position. The angle formed was adjusted to 10 °. After cutting, the edge glass part was disposed of after being sent by a conveyor belt so as to go straight while maintaining an angle of 45 ° with the horizontal plane. On the other hand, the effective glass part was broken after scribing with a wheel chip at intervals of 600 mm in the longitudinal direction, and a glass plate as a 900 × 600 mm product was collected. As a result, no breakage occurred during the edge cutting process during the production of 5000 glass plates.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Molding furnace 4 Annealing furnace 5 Local heating means 6 Cooling means 7 Cutting planned line 8 Initial crack 9 Branch start position 10 Cutting start point 11 Branching reference position 17 Winding apparatus 18 Core A1 Molding zone B1 Slow cooling zone C1 Cooling Zone D1 Cutting zone G Band-shaped plate glass Ga Effective glass part Gb Edge glass part Gb1 Ear part H Heating area F Cooling area

Claims (15)

A forming process for forming molten glass into a strip-shaped plate glass, an annealing process for preventing internal strain from occurring in the effective glass portion of the strip-shaped sheet glass that has undergone the forming process, and a strip-shaped plate that has undergone the annealing process A cooling process for cooling the glass sheet, and a cutting process for continuously cutting the edge in the width direction while feeding the strip-shaped plate glass that has undergone the cooling process to divide the glass into an effective glass part and an edge glass part In the manufacturing method of the sheet glass provided with,
In the cutting step, the degree of change in the orbit of the effective glass part is set to be larger than the degree of change in the orbit of the edge glass part, based on the extension line of the orbital sheet glass before cutting. The manufacturing method of the plate-like glass characterized.   2. The method for producing a sheet glass according to claim 1, wherein the track of the edge glass portion is the same as or substantially the same as an extension of the track of the band-shaped plate glass before the cutting.   The branch start position of the track of the effective glass portion and the track of the edge glass portion exists at a position separated by a separation dimension within 1000 mm from the cutting start point. The manufacturing method of plate glass of description.   The method for producing sheet glass according to claim 3, wherein a lower limit value of a separation dimension from the cutting start point to the branch start position is 100 mm.   Assuming that the thickness of the effective glass portion is A, the position where the separation distance from the branch start position on the virtual extension surface along the track of the strip-shaped plate glass before the cutting is A / tan 1 ° is a branch reference. When the position, the angle between the tangent line from the branch reference position to the track of the effective glass part and the tangent line from the branch reference position to the track of the edge glass part is 1 to 45 degrees. The manufacturing method of the plate glass in any one of Claims 1-4 characterized by the above-mentioned.   In the cutting step, after the initial crack is formed on the planned cutting line of the strip-shaped sheet glass before the cutting, the initial heating is caused by the local heating along the planned cutting line and the stress generated by the cooling with respect to the heating region. The method for producing a sheet glass according to any one of claims 1 to 5, wherein a crack is propagated to cut the sheet glass full-body.   The method for producing a sheet glass according to claim 6, wherein the local heating is performed by a carbon dioxide laser.   The method for producing sheet glass according to any one of claims 1 to 7, wherein the forming step, the annealing step, and the cooling step are performed by a downdraw method.   The method for producing sheet glass according to claim 8, wherein the cutting zone for performing the cutting step is arranged vertically below the cooling zone for performing the cooling step.   The plate shape according to any one of claims 1 to 9, further comprising a step of winding the effective glass portion into a roll around a core while continuously cutting the belt-shaped plate glass. Glass manufacturing method.   The thickness of the said effective glass part is 200 micrometers or less, The manufacturing method of the plate glass in any one of Claims 1-10 characterized by the above-mentioned.   A plate-like glass comprising two opposite sides cut by the method according to any one of claims 1 to 11 and having a thickness of 200 µm or less.   A plate-like glass characterized in that two opposing sides are cut by the method according to any one of claims 1 to 11, the bending strength of the cut surface is 200 MPa or more, and the thickness is 200 µm or less. .   A sheet-shaped glass wound body, wherein the effective glass portion is wound around a winding core in a roll shape by the method according to claim 10. A forming zone for forming molten glass into a strip-shaped plate glass, an annealing zone for preventing internal strain from occurring in an effective glass portion of the strip-shaped plate glass that has passed through the forming zone, and a strip-shaped plate that has passed through the annealing zone A cooling zone that cools the glass-like glass, and while feeding the strip-like plate-like glass passing through the cooling zone, the edge in the width direction is continuously cut to be divided into an effective glass portion and an edge glass portion. In the plate glass manufacturing apparatus configured as described above,
The degree of change in the orbit of the effective glass portion is set to be larger than the degree of change in the orbit of the edge glass portion, based on the extension line of the orbit of the strip-shaped plate glass before cutting. An apparatus for producing sheet glass.

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