JP5867725B2 - Sheet glass manufacturing method and manufacturing apparatus - Google Patents

Description

  The present invention relates to a technique for breaking a plate glass with a scribe formed in the plate glass as a boundary and collecting glass chipping generated during the breaking.

  As is well known, in the manufacturing process of flat glass products used for flat panel displays such as liquid crystal displays, plasma displays, and electroluminescence displays, a small area glass sheet is cut from a large area glass sheet, or an edge along the side of the glass sheet. Or trim. As a technique for that purpose, cleaving a plate glass can be mentioned.

  As one of methods for cleaving a sheet glass, a cleaving method by folding is known. In this method, after a scribe is formed on a plate glass, the periphery of the scribe is pressed using a split member. As a result, a bending moment is applied in the vicinity of the scribe, and by the tensile stress generated in the plate glass due to this, the scribe is advanced from the scribe surface (surface on which the scribe is formed) side of the plate glass to the other side to cleave. How to do it.

  By the way, when this method is used, the glass chipping which consists of a glass piece, glass powder, etc. generate | occur | produces from the broken part of the broken plate glass. If this glass chipping is not properly collected and adheres to and remains on the broken plate glass, the product value of the finally produced plate glass product, particularly a product that requires a high degree of cleanliness, is greatly reduced. Invite things.

  In order to prevent such a situation, Patent Document 1 discloses that a scribing formed on a plate glass in a vertical posture is covered with a covering member over the entire length thereof to form an air circulation space, and then the scribing is performed. There is disclosed a method of manufacturing a plate glass that breaks the plate glass as a boundary and collects the glass chipping generated at the time of the break by the air flowing through the circulation space.

JP 2004-338994 A

  However, even the method disclosed in Patent Document 1 still has problems to be solved.

  That is, the glass chipping generated at the time of splitting is entrained by the air flowing in the covering member and is carried in the same direction as the air flow. There was a case where it adheres to. Therefore, there has been a problem that glass chipping cannot be properly collected.

  In addition, the amount of glass chipping generated from the cleaving portion is greatly affected by the amount of pressing force that presses the periphery of the scribe during splitting, and a larger amount of glass chipping occurs as the pressing force increases. Cheap. For this reason, when a large pressing force is required, for example, when the plate glass is broken at a high speed, a large amount of glass chipping occurs, and the above problem becomes more serious.

  This invention made | formed in view of the said situation makes it a technical subject to collect | recover appropriately, without making the glass chipping which generate | occur | produced when breaking plate glass adhere to plate glass.

  In order to solve the above-mentioned problems, a method for producing a plate glass according to the present invention is to form a scribe on a plate glass in a vertical position and cover the scribe with a covering member over the entire length of the scribe distribution space. After forming, the plate glass is broken with the scribe as a boundary, and the glass chipping generated by the breakage flows into the distribution space from one end side in the direction along the scribe in the distribution space and along the scribe. It is characterized in that it is captured and recovered by the mist flowing out of the flow space from the other end side in the direction.

  According to such a method, by flowing mist from one end side to the other end side in the direction along the scribe in the distribution space, it is possible to catch the scattered glass chipping generated from the cleaving portion with the mist. At the same time, it can be transported from the outflow space to the outside of the outflow space and recovered. Furthermore, since the plate glass is in a vertical posture, the glass chipping captured by the mist is prevented from dropping and adhering to the plate glass due to the action of gravity. As a result, the generated glass chipping can be properly recovered without adhering to the plate glass. Here, as the mist, water mist is preferably used, but a misted organic substance such as carbon tetrachloride or oleic acid may be used. When water mist is flowed as mist in the circulation space, the periphery of the scribe covered by the covering member is in a humidified state. It has been found that under this humidified condition, the pressing force required to break the plate glass is reduced. For this reason, it becomes possible to suppress the quantity of the glass chipping which generate | occur | produces from the cleaving part of plate glass in the case of folding. Furthermore, since the inside of the distribution space is humidified, static electricity is less likely to be charged by glass chipping, and thus the effect of preventing adhesion to the plate glass can be further enhanced.

  In the above method, it is preferable that the scribe is formed in the vertical direction of the plate glass, and one end side in the circulation space is an upper side and the other end side is a lower side.

  In this way, the mist and the glass chipping are transported from the upper side to the lower side without resisting gravity, so that the glass chipping can be reliably recovered without waste.

  In the above method, it is preferable to cause the plate glass to advance from the upper side to the lower side.

  In this way, since the direction of folding and the direction of the mist flowing in the distribution space are both from the upper side to the lower side, a large amount of mist is not required when collecting the glass chipping. There is no need to flow into the space.

  In the above method, the folding member for breaking the plate glass includes a pressing portion that extends in the vertical direction and presses the scribe surface of the plate glass on which the scribe is formed, and the pressing portion is from the upper side to the lower side. It is preferable to have an inclined portion that gradually separates from the scribe surface of the plate glass as it moves to, and press the periphery of the scribe sequentially from the upper side to the lower side with the pressing portion of the folding member.

  In this way, when the pressing portion of the split member has an inclined portion that gradually separates from the scribe surface of the plate glass as it moves from the upper side to the lower side, the pressing force is applied to the plate glass. Are sequentially pressed from the upper side to the lower side by the folding member. For this reason, the bending moment generated around the scribe due to the pressing force is similarly generated sequentially from the upper side to the lower side. As a result, it is possible to reliably advance the breaking of the plate glass from the upper side to the lower side.

  In the above method, around the edge parallel to the vertical direction of the plate glass, the scribe is formed in parallel to the edge and excluding both ends in the vertical direction of the plate glass, and the folding member It is preferable that the both side front end portions in the vertical direction of the pressing portion have projecting portions that gradually project inward from the edge side of the plate glass as it moves to the front end side.

  When the plate glass is pressed, a bent portion in which the plate glass is locally bent by a bending moment is formed on the plate glass. And in the both ends (henceforth only both ends) of the up-down direction of the plate glass from which the formation of scribe was excluded, this bent part moves to the front end side in the up-down direction following the shape of the protruding part that presses both ends. As it gradually protrudes from the edge side to the inside, it is continuously formed in a state of being connected to the scribe. At this time, since a high tensile stress is applied to the bent portion as compared with the peripheral portion thereof, the plate glass is not scribed at both ends, but is broken along the bent portion connected to the scribe. become. As a result, the corner portion of the plate glass after being folded is in the same state as when the R processing is performed. Thereby, it is not necessary to perform the R processing of the corner portion again on the plate glass after the folding, and the production efficiency of the plate glass can be improved.

  In the above method, it is preferable that the mist is caused to flow through a cylindrical body having a bellows structure in which large-diameter portions and small-diameter portions are alternately connected to flow into the circulation space from above the circulation space.

  In this way, the large diameter part of the cylindrical body having the bellows structure blocks the droplets generated due to the aggregation of the mist, so that the droplets flow into the circulation space and contaminate the plate glass. The risk of doing so is reduced as much as possible.

  Moreover, the manufacturing apparatus of the plate glass based on this invention created in order to solve the said subject is the covering member which forms the distribution space of mist by covering the scribe formed in the plate glass of a vertical attitude over the full length. And a folding member that breaks the plate glass with the scribe as a boundary, and the mist flowing into the distribution space from one end side in the direction along the scribe in the distribution space and in the direction along the scribe in the distribution space It is characterized by comprising mist distribution means for flowing out of the distribution space from the other end side.

  According to such a structure, the effect similar to the matter already stated about the manufacturing method of said plate glass can be enjoyed.

  As described above, according to the present invention, it is possible to capture the glass chipping generated and scattered from the cleaving portion when breaking the plate glass by the mist flowing in the circulation space. And can be recovered properly.

It is a perspective view which shows the manufacturing apparatus of the plate glass which concerns on embodiment of this invention. It is sectional drawing which shows the covering member with which the manufacturing apparatus of plate glass was equipped. It is the front view and side view which show the split bar with which the manufacturing apparatus of plate glass was equipped. It is a front view which shows the implementation condition of the manufacturing method of the plate glass which concerns on embodiment of this invention along a time series. It is a front view which shows the folding bar with which the manufacturing apparatus of plate glass was equipped. It is a side view which shows the folding bar with which the manufacturing apparatus of plate glass was equipped. It is a side view which shows the folding bar with which the manufacturing apparatus of plate glass was equipped.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in this embodiment, the case where the edge part of the both sides parallel to the up-down direction of the plate glass made into the vertical attitude | position is broken as a boundary is demonstrated as an example.

  FIG. 1 is a perspective view showing a sheet glass manufacturing apparatus according to an embodiment of the present invention. As shown in the figure, a sheet glass manufacturing apparatus 1 includes a covering member 2 that forms a circulation space F of water mist M by covering a scribe S formed on a sheet glass G in a vertical posture, Supply hose 4 as a cylindrical body for allowing water mist M to flow in, exhaust hose 5 for allowing water mist M to flow out of circulation space F, and vicinity of scribe S by pressing the periphery of edge Ga in plate glass G A folding bar 3 as a folding member that causes a bending moment to act on is formed as a main element. Note that the plate glass G to be folded is suspended by a gripping member (for example, a chuck) (not shown). Here, in the present embodiment, water mist is used as the mist, but organic substances such as carbon tetrachloride and oleic acid may be used as long as they can be misted. However, when water mist is used, it is more preferable to use water mist because secondary effects described later, such as static electricity hardly becoming charged in glass chipping, are exhibited.

  The covering member 2 is provided with two pairs of a pair of sheet glass G sandwiched in the thickness direction, and two scribe lines formed in parallel with the edge portion Ga parallel to the vertical direction of the sheet glass G. S is configured to cover the entire length from the front side and the back side of the plate glass G. Further, as shown in FIG. 2, the covering member 2 has a “U” -shaped cross-sectional shape, and the water mist M surrounded by the front and back surfaces of the plate glass G and the covering member 2. A distribution space F is formed. Furthermore, rubber | gum 2a is provided in the contact part by the side of the edge part Ga among two contact parts with the surface of the plate glass G, and a back surface, and shows in the same figure using the folding bar 3 mentioned later. When the plate glass G is pressed in the P direction, the distribution space F is always sealed by the expansion and contraction of the rubber 2a according to the deformation of the plate glass G. Further, openings are formed at both ends in the vertical direction of the covering member 2, the upper opening serves as an inlet for allowing the water mist M to flow into the circulation space F, and the lower opening serves as the circulation space F. It serves as an outlet from which water mist M flows out.

  The supply hose 4 connected to the inlet formed in the covering member 2 and the exhaust hose 5 connected to the outlet have a large-diameter portion having a large inner diameter and a small-diameter portion having a small inner diameter alternately connected. It has a so-called bellows structure. The supply hose 4 is connected to a water mist supply device (for example, a humidifier) (not shown), and the water mist M generated by the supply device passes through the supply hose 4 and flows into the circulation space F. The exhaust hose 5 is connected to a suction device (not shown) (for example, a vacuum pump), and a negative pressure acts on the exhaust hose 5 by the suction of the suction device, and the water mist M flows out of the circulation space F. To do.

  From the above configuration, the water mist M generated by the water mist supply device passes through the supply hose 4 and flows into the outflow space F from the inlet, and then along the scribe S formed on the plate glass G. It flows from the upper side to the lower side. Thereafter, the air is exhausted from the outlet to the outside of the circulation space F, passes through the exhaust hose 5 and reaches the suction device. In this embodiment, the water mist supply device, the supply hose 4, the exhaust hose 5, and the suction device constitute a mist distribution means.

  As shown in FIG. 3A, the folding bar 3 is installed so as to be parallel to the edge portion Ga of the plate glass G. Protruding portions 3a that gradually protrude inward from the edge portion Ga side of the glass sheet G as it moves toward the leading end side are provided at both front end portions in the vertical direction. Moreover, as shown in FIG. 3B, which is a side view of the split bar 3 viewed from the direction A shown in FIG. 3, the pressing portion 3b that presses the scribe surface (surface on which the scribe is formed) of the plate glass G is The entire region in the vertical direction is inclined so as to gradually move away from the scribe surface of the plate glass G as it moves from the upper side to the lower side. Thereby, when the split bar 3 presses the plate glass G, the pressing part 3b is configured to contact and press the scribe surface of the plate glass G sequentially from the upper side to the lower side. Here, the inclination angle of the pressing portion 3b with respect to the vertical line is preferably 0.1 ° to 5 °.

  Hereinafter, the manufacturing method of the plate glass using said plate glass manufacturing apparatus 1 is demonstrated with reference to attached drawing. In addition, in each drawing for explaining the manufacturing method of plate glass, illustration of the covering member 2, the supply hose 4, the exhaust hose 5, and the distribution space F is omitted.

  First, as shown in FIG. 4A, a scribe S is formed on the glass sheet G starting from point B shown in FIG. 4 by pressing with a wheel cutter, laser irradiation, or the like. The scribe S is formed so as to be parallel to the edge portion Ga, excluding both end portions in the vertical direction of the plate glass G. In addition, it is preferable that the separation distance from the edge part Ga of B point is about 3 mm-50 mm. If it is less than 3 mm, it becomes difficult to make the corner portion Gb the same shape as that subjected to the R processing, as will be described later. Further, when the plate glass G is conveyed, the plate glass G is likely to be broken at the scribe S before being broken by the folding bar 3 due to vibration or the like. Further, if it exceeds 50 mm, it is not practical to make the corner portion R-shaped.

  Next, when the formation of the scribe S is completed, the scribe S is covered over the entire length by the covering member 2 (not shown). Thereafter, as shown in FIG. 4B, the scribe surface (surface on which the scribe is formed) of the plate glass G is sequentially pressed from the upper side to the lower side using the split bar 3 (pressing force is applied). The direction is the direction from the near side to the far side in the figure). Here, in the split bar 3 shown in the same figure, the area | region which gave the cross hatching represents that the area | region is pressing the plate glass G (same in subsequent figures).

  When the pressing of the glass sheet G by the split bar 3 is started, the water mist M is caused to flow into the circulation space F through the supply hose 4. At this time, since the supply hose 4 has the bellows structure, even when water droplets are generated in the supply hose 4 due to aggregation of the water mist M, the water drops are blocked by the large-diameter portion of the bellows structure. Therefore, the water droplets are prevented from flowing into the circulation space F. As a result, it is possible to reduce as much as possible the possibility of the plate glass G being contaminated by water droplets.

  When the vicinity of the upper end portion of the glass sheet G is pressed by the split bar 3, the glass sheet G has a bending moment generated due to the pressing force, as shown by a two-dot chain line in FIG. A bent portion L that is locally bent is formed. The bent portion L follows the shape of the protruding portion 3a provided on the folding bar 3 and gradually protrudes from the edge Ga side to the inner side as it moves to the upper end in the vertical direction of the glass sheet G, and the point B And continuously formed in a state of being connected to the scribe S. At this time, since a high tensile stress is applied to the bent portion L as compared with the peripheral portion thereof, the glass sheet G is not scribed in the scribe S but is in the bent portion L connected to the scribe S in this portion. As a result, the cleaved portions C are sequentially formed in the V direction shown in FIG. Further, glass chipping K made of glass pieces, glass powder, or the like is generated from the cleaved portion C and scattered in the distribution space F. The glass chipping K is captured by the water mist M flowing in the circulation space F and is transported from the upper side to the lower side.

  Thereafter, as shown in FIG. 4 (c), when the pressing of the plate glass G by the folding bar 3 is further advanced downward, in the vicinity of the scribe S formed on the scribe surface of the plate glass G, the upper side is lowered from the upper side. Bending moments are generated sequentially toward the side. Thereby, the glass sheet G is sequentially broken from the upper side to the lower side with the scribe S as a boundary. Also at this time, glass chipping K is generated from the cleaved portion C as in the case described above.

  When the folding of the glass sheet G proceeds, the periphery of the scribe S is humidified by the water mist M flowing in the circulation space F. And under this humidified state, it has been found that the pressing force required to break the plate glass G becomes small. For this reason, it becomes possible to suppress the quantity of the glass chipping K which generate | occur | produces from the cutting part C in the case of folding.

  Furthermore, since both the direction of folding and the direction of flow of the water mist M flowing in the distribution space F are changed from the upper side to the lower side, a large amount of water mist M for collecting the glass chipping K is unnecessary. It is no longer necessary to flow into the distribution space F. Further, the water mist M and the glass chipping K are carried from the upper side to the lower side without resisting gravity. For this reason, the glass chipping K can be reliably recovered without waste.

  In addition, since the plate glass G is in a vertical posture, the action of gravity is added, and the situation where the glass chipping K captured by the water mist M falls and adheres to the scribe surface of the plate glass G is avoided. can do. Moreover, since the inside of the distribution space F is humidified, static electricity is less likely to be charged to the glass chipping K, so that the effect of preventing adhesion to the plate glass G can be further enhanced.

  Then, when the sheet glass G is further broken, and the vicinity of the lower end of the plate glass G is pressed by the breaking bar 3, the plate glass G is the same as when the vicinity of the upper end is pressed. Is broken, and the edge portion Ga of the glass sheet G is completely cut as shown in FIG. Further, the glass chipping K carried from the upper side to the lower side by the water mist M is carried to the outside of the circulation space F through the exhaust hose 5 together with the water mist M and collected. When these are completed, the water mist M stops flowing into the circulation space F.

  The plate glass G manufactured in this way is in the same state as the corner portion Gb subjected to R processing, as shown in FIG. Thereby, since it becomes unnecessary to perform R process anew with respect to the plate glass G after performing a split, the production efficiency of the plate glass G can be improved.

  Moreover, when moving the plate glass G in the middle of a process within a process or between processes, in order to prevent that a crack and a crack arise in the plate glass G, the plate glass G may be mounted on a protective sheet. At this time, in the plate glass manufactured by the conventional manufacturing method, the corner portion has a sharp shape with a square corner, so the corner portion is pierced or caught on the protective sheet, and the protective sheet is removed. Caused a problem that made it difficult. However, in the plate glass G manufactured by the above-described plate glass manufacturing method, it is possible to suppress the occurrence of such problems as much as possible.

  Here, the structure of the manufacturing apparatus of the plate glass which concerns on this invention is not limited to the structure demonstrated by said embodiment. For example, in the above embodiment, the water mist is flowed from the upper side to the lower side. However, the water mist may be flowed from the lower side to the upper side. In this case, it is preferable that the direction of inclination in the pressing portion of the split bar is upside down with respect to the above embodiment, and the progress direction of the split is from the lower side to the upper side. In addition, it is also possible to adopt a configuration in which water mist is caused to flow in a horizontal direction or an oblique direction.

  Furthermore, the shape of the split bar is not necessarily the same as that of the above embodiment. For example, the shape of the protrusion provided on the folding bar may be a curved shape as shown in FIG. Further, in the above embodiment, the pressing portion of the split bar has a shape in which the whole area in the vertical direction is inclined. However, as shown in FIG. . Furthermore, as shown in FIG. 7, the pressing portion 3b may have a shape in which a gradient is formed in two stages. In this case, the first gradient portion 3ba of the pressing portion 3b is formed such that the ratio thereof is 10% or less with respect to the length of the folding bar 3, and the inclination angle with respect to the vertical line is 3 ° to 10 °. And if the inclination-angle of 2nd gradient part 3bb which continues to 1st gradient part 3ba shall be 0.1 degrees-5 degrees, implementation of folding will become easier.

  Further, the timing of flowing the water mist into the circulation space is not limited to the above embodiment, and the water mist may flow into the circulation space before the folding bar presses the plate glass. Alternatively, the water mist may always flow through the distribution space regardless of the progress of the splitting.

  In addition, in the above-described embodiment, the case where the edge portions on both sides parallel to the vertical direction of the plate glass are broken with the scribe as a boundary is described as an example, but the present invention is not limited to this. For example, the plate glass manufacturing method according to the present invention can be used even when the center portion of the plate glass is broken instead of the edge portion. In this case, it is not always necessary to provide a protrusion on the split bar.

DESCRIPTION OF SYMBOLS 1 Sheet glass manufacturing apparatus 2 Cover member 2a Rubber 3 Folding bar 3a Protrusion part 3ba 1st gradient part 3bb 2nd gradient part 3b Press part 4 Supply hose 5 Exhaust hose G Sheet glass Ga Edge part of glass sheet Gb Corner part S of glass sheet S Scribe B Scribing origin L Bending part M Water mist F Water mist distribution space C Split part K Glass chipping

Claims (7)

A scribe is formed on a plate glass in a vertical posture, and the scribe is covered with a covering member over the entire length thereof to form a mist distribution space. The trapped glass chipping is captured by the mist that flows into the distribution space from one end side in the direction along the scribe in the distribution space and sucks out from the distribution space from the other end side in the direction along the scribe. And collecting the glass sheet.   2. The method for producing a plate glass according to claim 1, wherein the scribing is formed in the vertical direction of the plate glass, and one end side in the circulation space is an upper side and the other end side is a lower side.   The method for producing a plate glass according to claim 2, wherein the splitting of the plate glass is advanced from the upper side to the lower side. The breaking member for breaking the plate glass includes a pressing portion that extends in the vertical direction and presses the scribe surface of the plate glass on which the scribe is formed, and as the pressing portion moves from the upper side to the lower side, It has an inclined part gradually separating from the scribe surface of the plate glass,
The manufacturing method of the plate glass of Claim 3 which presses the periphery of the said scribe sequentially from the upper side to the lower side with the press part of the said folding member.   Forming the scribe around the edge parallel to the vertical direction of the plate glass, excluding both ends in the vertical direction of the plate glass in parallel with the edge, and the vertical direction of the pressing part of the folding member 5. The method for manufacturing a plate glass according to claim 4, wherein the both side tip portions have protrusions that gradually protrude inward from the edge side of the plate glass as it moves toward the tip side.   3. The mist is caused to flow through a cylindrical body having an accordion structure in which large-diameter portions and small-diameter portions are alternately arranged to flow into the distribution space from above the distribution space. 6. The method for producing a plate glass according to any one of 5 above. A covering member that forms a mist distribution space by covering a scribe line formed on the vertically oriented glass sheet, a folding member that breaks the glass sheet with the scribe as a boundary, and the mist distribution And a mist distribution means for flowing into the distribution space from one end side in the direction along the scribe in the space and sucking out the distribution space from the other end side in the direction along the scribe in the distribution space. An apparatus for producing flat glass.

Images