JP2009137800A - Method of manufacturing armed glass plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing an armed glass plate by which thereis no deviation in a position, where a mettalic mesh is inserted, by facilitating the insertion of the mettalic mesh into the vicinity of the center or the predetermined position in a glass ribbon in the thickness direction with respect to a manufacturing method by which the mettalic mesh is inserted from the lower side in a single flow process. <P>SOLUTION: The method of manufacturing the armed glass plate is carried out by allowing a layer of molten glass stream 5 to pass through a gap between an upper side forming roll 9 and a lower side forming roll 10 to form a glass ribbon, inserting the mettalic mesh 7 from the lower side into the molten glass stream 5 before the passing of the stream between the roll9 and the 10 to form a mesh-containing glass ribbon 11 and slowly cooling and cutting the mesh-containing glass ribbon 11. The molten glass stream 5 in an opening part for inserting the mettalic mesh 7 is positioned below a position where the mettalic mesh 7 is inserted and is supported by a support 8 not in contact with the lower side forming roll 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a wire mesh-containing glass plate in which a wire mesh is enclosed in a glass plate. More specifically, the present invention relates to a method for manufacturing a wire mesh-containing glass plate in which a wire mesh is inserted from below into the flow of one layer of molten glass.

  As described in Patent Document 1, the method for producing a wire mesh-containing glass plate is divided into a case where the flow of the molten glass when inserting the wire mesh is a single layer and a case where it is a double layer. Hereinafter, the former is called a single flow method and the latter is called a double flow method.

  In the double flow method, the flow of the molten glass before insertion of the metal mesh is separated to form two layers, and the metal mesh is inserted between the layers and integrated by upper and lower forming rolls. In this method, there are two outlets for the flow of the molten glass from the front furnace (fore hearth) of the melting furnace, and foreign substances caused by the furnace material around the outlet are likely to be mixed. Moreover, in this method, it is necessary to separately guide the flow of the two layers of high-temperature molten glass to the insertion position of the wire mesh. This is a structurally complicated factor compared to the single flow method. Furthermore, in this method, it takes time to stabilize the manufacturing conditions due to such a structure. Furthermore, in this method, when inserting the wire mesh from above, it is effective to insert the wire mesh in the vicinity of the center of the plate thickness, but this is caused by inserting the wire mesh from above by the single flow method described below. The same problem occurs. From these problems, the single flow method is preferable to the double flow method, and the method of inserting the wire mesh from below is desirable.

  Even in the single flow method, it is divided into a case where the wire net described in FIG. 3 of Patent Document 2 is inserted from above the flow of the molten glass and a case where it is inserted from below described in FIG. 1 of Patent Document 1. . When the metal mesh is inserted from above, there are problems that the metal mesh is likely to be oxidized before insertion due to the high heat of the flow of the molten glass and that dust from above tends to enter during insertion. Further, in order to prevent this oxidation, a treatment such as chrome plating is required. However, the chrome plating process is not desirable because it has a great influence on the environment. Furthermore, since the wire mesh is inserted from above the molten glass flow, the structure of the apparatus is complicated.

  On the other hand, when the wire mesh is inserted from below, there are few problems that the wire mesh is easily oxidized. Moreover, it becomes a relatively simple structure compared with the case where it inserts from the upper direction of an apparatus. However, when inserting a metal mesh from the bottom to the top, it is often difficult to adjust the tension of the wire mesh because it is pulled downward in the flow direction of the molten glass after being pressed by the forming roll. It tends to be on the lower side rather than the center of the thickness. In order to avoid this, it takes time to change the temperature of the molten glass flow and the tension of the wire mesh to obtain appropriate conditions.

  The adjustment of the position of the wire mesh in the thickness direction when the wire mesh is inserted from below the molten glass flow by the single flow method described above is particularly problematic in the so-called polished wire mesh-containing glass plate, which is polished after forming the wire mesh-containing glass plate. Become. That is, the glass plate with a polished wire mesh is polished on the lower surface after the wire mesh is inserted, so if the wire mesh is near the lower surface and the position falls within the range of the polishing allowance, the wire mesh comes out of the glass plate by polishing. Will come.

Japanese Patent Publication No.47-3624 JP 2007-153663 A

  In the present invention, in view of the above problems, even when a wire mesh is inserted from below the molten glass flow by a single flow method, it is easy to place the wire mesh in the wire mesh-containing glass plate at the center of the plate thickness or at a predetermined position. An object of the present invention is to provide a method for manufacturing a wire mesh-containing glass plate without bias in the position where the wire mesh is inserted.

The inventors have found the following matters in solving the above problems.
In order to prevent the bias of the insertion position of the wire mesh, the circumferential length of the molten glass forming roll that is in contact with the upper and lower forming rolls before pressing (hereinafter referred to as the “contact portion length”). It is effective that the upper and lower molding rolls are balanced. Moreover, it is effective that the lengths of the contact portions with respect to the upper and lower molding rolls are equal in the axial direction of the molding rolls.

  This is because the part where the temperature is lower than the other parts in contact with the upper and lower molding rolls is moved to the pressing part, and the length of the contact part is greatly different between the upper and lower molding rolls. This is because the difference in temperature between the upper and lower molten glass layers sandwiching the wire net is remarkable, and as a result, the thickness of the upper and lower molten glass layers is greatly different.

  However, as shown in the drawing for explaining the outline of the method for producing a meshed glass plate according to the prior art in FIG. 5, the length (dotted line in the figure) of the contact portion 31 of the lower forming roll 10 is lower side. There is an opening F for inserting a wire mesh in front of the forming roll 10 (front furnace side), and the amount of molten glass in this region cannot be increased stably due to the free surface. It becomes shorter than the length of the contact part 30 (dotted line in the figure).

  Moreover, even if it is going to lengthen the length of the contact part in the lower forming roll 10 in the range where the flow 5 of the molten glass having a free surface from the opening F does not fall unstable, the flow of the molten glass in this part Since the forming rolls 9 and 10 are always rotating, the molten glass hangs unevenly in the axial direction of the lower forming roll 10.

  As a result, the thickness of the lower layer into which the metal mesh 7 of the molten glass flow 5 is inserted at the time of pressing becomes non-uniform over the axial direction of the molding roll. In addition, this non-uniformity causes deformation in the in-plane direction of the metal mesh 7. Further, this non-uniformity makes it difficult to control the position of the metal mesh 7 to be inserted in the thickness direction, and the position of the metal mesh 7 is varied.

  In solving the above problems, the present invention reduces the sag of unstable molten glass that occurs when the length of the contact portion between the lower forming roll and the molten glass is increased, based on the matters found above. It is characterized by making it uniform over the axial direction of the side molding roll.

  That is, in order to achieve the above object, the present invention allows a flow of a single layer of molten glass to pass between an upper molding roll and a lower molding roll to form a glass ribbon and to melt before the rolls. A method for producing a glass plate with a wire mesh, in which a wire mesh is inserted into a glass flow from below to form a glass ribbon having a wire mesh inside, and then the wire mesh-containing glass ribbon is gradually cooled and cut, and the wire mesh is inserted The metal mesh is characterized in that the flow of the molten glass in the opening for performing is supported by a support that is located below the position where the metal mesh is inserted and is not in contact with the lower molding roll. Provided is a method for manufacturing a glass sheet.

Moreover, this invention makes the molten glass contact area of the said upper shaping | molding roll substantially equal to the molten glass contact area of the said lower shaping | molding roll with respect to the said manufacturing method.
In this invention, since the temperature of the flow of the molten glass in contact with the upper and lower forming rolls becomes substantially equal, the viscosity of the layer of the molten glass in contact with the upper and lower forming rolls becomes approximately the same, and the wire mesh-containing glass ribbon after pressing Easy to pull out in the horizontal direction.

Moreover, this invention applies the tension | tensile_strength of the horizontal direction to the said metal net from the position before inserting in the said molten glass with respect to the said manufacturing method.
In this invention, since the viscosity of the lower layer of the molten glass in contact with the lower molding roll is approximately the same as the viscosity of the upper layer and is higher than before, it is possible to prevent the wire mesh from sinking, and further, the wire mesh-containing glass ribbon Can be pulled out in the horizontal direction, and flapping of the wire mesh can be eliminated by the applied tension, and the insertion position can be further stabilized.

Moreover, this invention consists of a rotating roll with which the said support body has a rotating shaft of the direction orthogonal to the flow direction of the said molten glass with respect to the said manufacturing method.
In this invention, since the surface which supports a molten glass can be renewed by rotation, the temperature distribution of a support body can be made small.

Moreover, this invention interposes a gas between the said support body surface and the said molten glass surface with respect to the said manufacturing method, and supports the flow of a molten glass via the said gas.
In this invention, the heat insulation layer by gas is formed between the molten glass surface and the support surface. This heat insulating layer can prevent the molten glass from being rapidly cooled. In this invention, since the support layer surface does not directly contact the molten glass surface because the gas layer is interposed between the molten glass surface and the support surface, contact marks, wrinkles and unevenness are formed on the formed glass ribbon. There is no remaining.

Moreover, this invention supplies the said gas to the said molten glass side surface from the said support body with respect to the said manufacturing method.
In the present invention, it is not necessary to provide means for supplying gas to the molten glass side of the support.

Moreover, this invention supplies a liquid to the said molten glass side surface of the said support body, and vaporizes with respect to the said manufacturing method.
In the present invention, the liquid is instantly vaporized by the high heat of the molten glass flow, and it is possible to stably form a gas layer. In the present invention, as a representative liquid, water that does not react chemically to the extent that vaporized vapor adversely affects the molten glass or the support, has low toxicity, and is nonflammable at the temperature used. it can. In the present invention, it is not necessary to have a hole through which the support body communicates.

Moreover, this invention supplies a liquid to the said molten glass side surface from the said support body with respect to the said manufacturing method, and is vaporized.
In the present invention, the liquid is instantly vaporized by the high heat of the molten glass flow, and it is possible to stably form a gas layer. In the present invention, water can be used as a representative liquid. In the present invention, there is no need to provide means for directly supplying the liquid to the molten glass side of the support.

Furthermore, in the present invention, the molten glass side surface of the support is made of a porous or fibrous material with respect to the manufacturing method.
In the present invention, gas can be contained inside. In the case of a liquid, it is composed of a substrate whose liquid absorbency exceeds the amount of vapor generated from the surface of the support. In the present invention, the resistance between the molten glass surface and the support surface is reduced, the molten glass is not cooled too strongly, and the warpage of the support itself can be further suppressed. In the present invention, more uniform cooling is possible in the width direction orthogonal to the flow direction of the molten glass, and the thickness of the lower layer of the molten glass and the insertion position of the wire mesh are further stabilized.

Furthermore, according to the present invention, the material is made of carbon, ceramics or metal in the above manufacturing method.
In the present invention, the support has heat resistance and durability, and gas can be stably formed.

  According to the present invention, even when the wire mesh is inserted from below in the single flow method, the length of the contact portion of the lower molding roll before pressing the molding roll is reduced by the support as compared with the case of the prior art. Further, the length of the contact portion can be made uniform over the axial direction of the lower molding roll, and the thickness of the lower layer of the glass ribbon becomes constant. Moreover, since the length of the molten glass which contacts the lower forming roll before pressing increases, the temperature of the lower layer of the molten glass flow decreases and the viscosity increases. As a result, it is possible to provide a method of manufacturing a glass sheet with a wire mesh that can suppress the wire mesh from sinking into the lower layer of the molten glass flow, can easily control the insertion position of the wire mesh, and can stabilize the insertion position. .

  In addition, according to the present invention, it is not necessary to perform a treatment that does not oxidize the wire mesh at a high temperature required by the double flow method, for example, a chrome plating coating that affects the environment in order to obtain the above effect.

  Hereinafter, according to drawings (FIGS. 1 to 4), a method for producing a wire mesh-containing glass plate according to the present invention will be described. FIG. 1 is a cross-sectional view for explaining the outline of a wire mesh-containing glass plate manufacturing apparatus according to the present invention. FIG.2 and FIG.4 is sectional drawing explaining the outline of another embodiment of the manufacturing apparatus of the metal-mesh glass plate based on this invention. FIG. 3 is a cross-sectional view illustrating a case where the support according to the present invention is formed into a roll shape using a vapor film forming agent. In the following description, as an example, soda lime glass, which is a material for architectural glass plates and automobile glass plates, is used as glass, but the glass in the present invention is not limited to this soda lime glass. Conditions such as the temperature of the molten glass and the temperature at the time of molding can vary depending on the type of glass and are not limited to the following conditions, but the technique is within the scope of known techniques.

  In the production of wire mesh-containing glass plates, raw materials such as silica sand, limestone, and soda ash are prepared according to the composition of the glass plate, put into a mixed melting furnace, and heated and melted to about 1400 ° C or higher depending on the type of glass. Thus, the molten glass 1 is obtained. For example, it is obtained by putting a batch into a known melting furnace from one end of the furnace, blowing a flame obtained by burning heavy oil to the introduced batch, and mixing and burning natural gas with air A molten glass 1 is obtained by blowing a flame and heating to about 1550 ° C. or more to melt the batch.

  In the single flow method according to the present invention, this molten glass 1 is led out through the lip 3 and the adjustment gate 4 at the front end of the front furnace 2 of the melting furnace to form a continuous molten glass flow 5 together with the wire mesh. 7 is inserted from below the tip of the lip 3 and further pressed by upper and lower forming rolls 9 and 10 to form the glass ribbon 11 containing the metal mesh 7 to a predetermined constant thickness.

  In the present invention, the length of the contact portion 31 of the molten glass that contacts the lower molding roll 10 before pressing is increased, and the length of the contact portion 31 extends in the axial direction of the lower molding roll 10. In order to make the thickness constant, the area below the position where the wire mesh is inserted and not in contact with the lower molding roll 10, that is, between the lower molding roll 10 and the lip 3, A support 8 is provided across the width direction perpendicular to the molten glass supply direction between the lower forming roll 10 into which the wire mesh 7 of the flow 5 is inserted. The support 8 increases the length of the contact portion 31 of the lower molding roll 10 before pressing the molding rolls 9 and 10 as compared with the case of the prior art, and further, the shaft of the lower molding roll 10. The length of the contact portion 31 can be made uniform across the direction, and the thickness of the lower layer of the glass ribbon becomes constant. Moreover, since the length of the molten glass which contacts the lower forming roll 10 before pressing increases, the temperature of the lower layer of the molten glass flow 5 decreases and the viscosity increases. As a result, the wire mesh 7 can be prevented from sinking into the lower layer of the molten glass flow 5, the insertion position of the wire mesh 7 can be easily controlled, and the insertion position can be stabilized. In addition, this support body 8 is a support body of the flow of a molten glass, and conveyance and shaping | molding itself of a molten glass are not intended.

When the molten glass is pressed, the flow 5 of the molten glass is 1100 to 1250 ° C. (viscosity 10 ^2.8 to 10 ^{3) in the case of} ordinary soda lime glass because the glass is not devitrified around the adjustment gate 4. ^.5 dPa · s), a temperature of 1000 to 1200 ° C. (viscosity 10 ^3.0 to 10 ^4.3 dPa · s) due to the pressing force when forming with the upper and lower pairs of forming rolls, the glass on the conveying roll 13 The temperature is preferably 850 ° C. or lower because there is no deformation of the ribbon.

  The wire mesh 7 is wound around a reel (not shown), and is drawn out from the reel at the time of manufacturing the wire mesh-containing glass plate. The wire mesh 7 is wound around a pass roller 17 or a water pipe and conveyed along a predetermined path, and then inserted into the molten glass flow 5 from the lower opening. The metal mesh 7 is made of mild steel or stainless steel, and may be provided with a coating for preventing oxidation as necessary. Examples of the coating include tin plating, nickel plating, and chrome plating. In the present invention, since the wire mesh is inserted from below, it is not necessary to have a chromium plating coating that is less affected by the oxidation of the wire mesh and has an adverse effect on the environment. The wire diameter of the wire mesh is preferably 0.3 to 0.8 mm, more preferably 0.3 to 0.65 mm, from the viewpoint of cutting the wire mesh-containing glass plate.

  After forming with the pair of upper and lower forming rolls 9 and 10, in order to gradually lower the glass temperature so as not to leave distortion in the wire mesh-containing glass ribbon 11, the wire mesh-containing glass ribbon 11 is removed in a slow cooling furnace (not shown) or in the air. For example, in soda lime glass, cooling is started from about 570 ° C. and gradually cooled to near room temperature over time. In the slow cooling furnace, the lower surface of the metal mesh-containing glass ribbon 11 is supported and conveyed by the forming guide 12 and the conveying roll 13. In addition, the shaping | molding guide 12 may be roll shape.

  Then, if necessary, the upper surface and / or the lower surface of the wire mesh-containing glass ribbon 11 is polished and cut into a predetermined size to obtain a glass product with a wire mesh.

  By the support 8 of the present invention, the length of the contact portion 31 (dotted line in the figure) with the lower molding roll 10 before pressing the upper and lower molding rolls 9 and 10 is lengthened, and the lower molding roll 10 It is preferable to make the length of the contact portion 31 uniform in the axial direction, that is, to make the molten glass contact area of the upper forming roll 9 and the molten glass contact area of the lower forming roll 10 substantially equal. As a result, the temperature of the flow of the molten glass in contact with the upper and lower forming rolls 9 and 10 becomes substantially equal, so that the viscosity of the molten glass layer in contact with the upper and lower forming rolls 9 and 10 becomes approximately the same. Furthermore, since the temperature of the lower layer of the molten glass flow 5 is lowered and the viscosity is increased as described above and as described above, the line connecting the axial centers of the upper and lower forming rolls 9 and 10 is different from the conventional technique. It can be made substantially perpendicular to the liquid surface of the glass 1, and the wire mesh-containing glass ribbon 11 can be drawn out in the horizontal direction.

  In the support 8, it is preferable to apply a horizontal tension to the wire mesh from a position before being inserted into the molten glass. This is the lower layer of the molten glass that can draw out the wire mesh-containing glass ribbon 11 that flows after being pressed by the upper and lower forming rolls 9 and 10 in the horizontal direction and that is in contact with the lower forming roll 10 as described above. This is because the wire mesh 7 can be prevented from sinking. Thereby, flapping of the wire mesh 7 can be eliminated and the insertion position can be further stabilized.

  It is preferable that the support 8 can be supported without being greatly deformed by contact with the molten glass flow 5 in the width direction orthogonal to the direction of the molten glass flow. In FIG. 1, a plate-like body extending in the width direction of the molten glass is shown as the support body 8. For example, the support body 8 has a roll shape as shown in FIG. 2 and a rotation axis in a direction orthogonal to the flow direction of the molten glass. The support (roll) 20 may be used. In the case of the support (roll) 20, since the surface supporting the molten glass is renewed by rotation, the temperature distribution of the support can be reduced.

  In order to reduce the warp in the width direction of the support due to the temperature difference of each part of the support, a structure in which a liquid or a gas is circulated is more preferable inside the plate-like body and the roll. In this case, if the cooling is too strong, the glass ribbon is distorted causing cracks in the subsequent process. Moreover, the reduction | decrease of the curvature of the support body in the width direction is possible by devising the reinforcement | strengthening structure of the path | route of a liquid or gas, and the support bodies 8 and 20. FIG. The circulating liquid is preferably water, and the circulating gas is preferably air, inert gas, or combustion gas. Further, a shape in which the support wraps the hanging glass 6 in the width direction is preferable. With such a shape, less molten glass protrudes from the support.

  The support of the present invention supports a flow 5 of molten glass through the gas by interposing a gas between the surface of the plate-like body 8 or the surface of the support (roll) 20 in FIGS. 1 and 2 and the surface of the molten glass. It is preferable to do. A heat insulating layer is formed between the sag 6 of the molten glass and the support 8 or 20 by the gas between the surfaces of the supports 8 and 20 and the surface of the molten glass. This heat insulating layer can prevent the drooping 6 of the molten glass from being rapidly cooled. Moreover, since the surface of the support bodies 8 and 20 does not directly contact the drooping 6 of the molten glass because the layer of the gas film is interposed between the dripping 6 of the molten glass and the support 8 or 20, it was molded. No contact marks, wrinkles or irregularities remain on the glass ribbon. In this case, if the thickness of the gas film layer is too small, the risk of direct contact between the support 8 or 20 and the sag 6 of the molten glass increases. As a result, it becomes insufficient for the formation of the heat insulating layer, and more easily affected by the unevenness of the surfaces of the supports 8 and 20, so that a minimum of 10 μm, preferably 50 μm or more is required. Further, if the gas film layer is too thick, there is an increased possibility that the pressure of the supports 8 and 20 is difficult to be transmitted. Therefore, the thickness is preferably 500 μm or less, and preferably 200 μm or less.

  The gas between the surfaces of the supports 8 and 20 and the molten glass surface can also be supplied directly from the inside of the support to the molten glass side surface. The gas can also be generated by supplying a liquid for generating a vapor film (hereinafter referred to as “vapor film forming agent”) on the molten glass side surface of the support and vaporizing it with the heat of the molten glass. Further, the gas can be generated by supplying a vapor film forming agent from the inside of the support to the molten glass side surface and vaporizing it with the heat of the molten glass.

  First, a case where a vapor film forming agent is used to generate gas will be described. The supports 8 and 20 can include a vapor film forming agent therein, and are composed of a base material whose liquid absorbency exceeds the amount of vapor generated from the surface of the support. For example, a porous material or a fibrous material can be preferably used. In the case of a porous body, a communication hole is preferable. The surface of the porous body preferably has fine pores having a pore diameter of 1 mm or less, more preferably 100 μm or less, and further preferably 30 μm or less. Furthermore, a material having a high affinity for the vapor film forming agent is preferable. With this configuration, the resistance between the molten glass sag 6 and the support 8 or 20 is reduced, the glass ribbon is not cooled too much, and the warp of the supports 8 and 20 itself can be further suppressed. In addition, this configuration enables more uniform cooling in the width direction orthogonal to the flow of the molten glass, and the thickness of the glass ribbon and the insertion position of the wire mesh 7 are further stabilized.

  As a material serving as a base material for the supports 8 and 20 forming the vapor film, porous lyophilic carbon having communication holes can be suitably used. In addition, for example, polymer materials derived from natural products such as cellulose, paper, wood, bamboo, and carbon-based materials can be used. Moreover, metal materials, such as iron, stainless steel, nickel, aluminum, platinum, and titanium, can also be used. In the case of a metal material, for example, a porous metal in which a plurality of meshes are stacked in several layers and are completely integrated by sintering, or a foam metal can be used. Furthermore, metal oxides such as aluminum oxide, zirconium oxide, silicon carbide, and silicon nitride, or a mixture thereof, metal carbide, porous ceramic material mainly composed of metal nitride, and the like can be used. Furthermore, the molding surface of the support 8 is preferably as smooth as possible except for fine holes and fibrous irregularities.

  As the vapor film forming agent, various substances such as organic substances and inorganic substances which are liquid at normal temperature and gas at the glass transition point can be used. Further, from the viewpoint of operability of supply to the supports 8 and 20, the melting point is 40 ° C. or less, and the boiling point under atmospheric pressure is 50 to 500 ° C., more preferably 300 ° C. or less. Furthermore, the vapor film forming agent does not react chemically so that the vapor vaporized by the vapor film forming agent adversely affects the sag 6 of the molten glass 6 and the supports 8 and 20, has low toxicity, and is used at the temperature used. It is preferably nonflammable. As a typical vapor film forming agent, water can be used. As described above, the vapor film forming agent is appropriately selected from liquids that can be vaporized instantaneously by the high heat of the molten glass to form a stable vapor film.

  In addition, the support for forming the vapor may be a continuous unit of plate-like unit units, a combination of unit units of a predetermined length, or a belt-like processed unit.

  FIG. 3 is a sectional view for explaining a case where a vapor film forming agent is used in the support (roll) 20 shown in FIG. The peripheral surface portion 42 of the body of the support (roll) 20 is formed of a roll base material that can contain a vapor film forming agent therein. Both roll end portions 43 are formed of a base material that does not contain a vapor film forming agent. The vapor film forming agent introduced into the roll base is configured to vaporize from the roll peripheral surface portion 42. Thus, the vapor film 40 is stably formed between the support (roll) 20 side surface of the molten glass flow and the support (roll) 20. As a method of supplying the vapor film forming agent to the roll substrate, a spray pipe (not shown) is arranged in the cavity S formed between the rotating shaft 41 of the support (roll) 20 and the roll peripheral surface 42. It is also possible to configure so that the liquid of the vapor film forming agent stored in the bathtub (not shown) is supplied to the spray tube by a pump so as to penetrate the entire roll base. The vapor film forming agent supplied to the spray tube is sprayed onto the inner peripheral surface of the support (roll) 20 from a number of spray holes formed in the spray tube.

  Or when using a roll-shaped support body, as shown in FIG. 4, the liquid supply container 21 is arrange | positioned on the side which does not face the molten glass of the outer surface of the support body (roll) 20, and a support body is provided. A vapor film forming agent may be supplied to the (roll) 20. The vapor film forming agent may be supplied by a spray method. In this case, since the liquid is directly supplied to the molten glass side surface, it is not necessary to provide a communication hole in the support. In short, any method can be used as long as it can be supplied so that the vapor film forming agent is sufficiently contained in the roll base material of the support (roll) 20.

  Next, a case where gas is directly supplied from the inside of the support to the molten glass side surface without using a vapor film forming agent to generate gas will be described. In this case, any of air, inert gas, and combustion gas is ejected from a hole for the purpose of venting the support surface to form a gas film, which is the same as in the case of using a vapor film forming agent. An effect can be obtained.

  As a base material of the base material of the support, ceramic materials having communication holes, for example, ceramics mainly composed of metal oxides such as aluminum oxide, zirconium oxide, silicon carbide, silicon nitride, metal carbide, and metal nitride Materials can be suitably used. Moreover, metal materials, such as iron, stainless steel, nickel, aluminum, platinum, and titanium, can also be used. In the metal material, for example, a porous metal in which a plurality of meshes are stacked in several layers and are completely integrated by sintering, or a foam metal can be used. In addition, when a metal is used, the metal tube may be a fine hole processed as a vent hole. In addition, the molding surface of the support is preferably as smooth as possible except for fine holes and fibrous irregularities.

  The gas pressure is preferably 0.105 to 0.305 MPa, more preferably 0.13 to 0.25 MPa, considering that the flow of molten glass is supported and the amount of gas to be supplied is not too large.

  The inert gas as the gas of the present invention is preferably nitrogen, argon or helium. As the combustion gas as the gas of the present invention, a gas obtained by burning heavy oil, oxygen, etc. used in the melting process can be used. Do not. Also, the drooping 6 of the molten glass is prevented from being overcooled by air, inert gas or combustion gas.

  A device that directly supplies gas ejects a large amount of gas continuously at a constant pressure during molding. Therefore, a chamber having a mechanism for adjusting the pressure of the gas is required, compared with a device that uses a vapor film forming agent. Can be complicated. On the other hand, when the gas is directly supplied, there is no concern of increasing the humidity of the environment in which it is manufactured like a vapor film forming agent.

In the following, other preferred embodiments will be listed in connection with the implementation of the present invention.
It is preferable that the length of the contact portion 30 in the circumferential direction between the upper forming roll 9 and the molten glass flow 5 can be adjusted. The reason is that by adjusting the length of the contact portion 30 in the upper molding roll 9 together with the adjustment of the length of the contact portion 31 in the lower molding roll 10 according to the present invention, the upper and lower molten glass This is because the flow layer thickness can be further adjusted. This adjustment is possible by adjusting the height of the upper forming roll 9 itself or adjusting the height of the adjustment gate 4.

  Since the volume of the drooping 6 of the molten glass increases, it is preferable to provide a shield between the metal net 7 and the drooping 6 of the molten glass in order to prevent the surrounding metal net 7 from being crushed by the flow of the molten glass. Further, it is preferable to purge the wire mesh 7 with hydrogen or the like before insertion in order to prevent oxidation of the wire mesh 7 as necessary.

  When a vapor film forming agent is used, it is preferable to provide an air curtain or the like so that the vapor does not reach the wire mesh 7.

  The shape of the lip 3 of the front furnace 2 is to make the downward angle larger than the conventional one and to be an acute angle compared with the conventional one in order to facilitate the separation from the drooping 6 of the molten glass whose volume has increased compared to the conventional one. preferable. Further, in order to facilitate the control of the separation, means for adjusting the temperature of the lip 3, for example, a heater as a heating body may be provided on the lip 3.

  In order to facilitate separation of the wire mesh-containing glass ribbon 11 from the lower molding roll 10, air, an inert gas, or the like from below the wire mesh-containing glass ribbon 11 is formed in a region between the lower molding roll 10 and the molding guide 12. And means for blowing up any of the combustion gases may be provided.

  The present invention is effective not only for the production of glass plates with wire mesh, but also for glass plates with reinforcing wires encapsulating other metal wires.

It is sectional drawing explaining the outline of the manufacturing apparatus of the metal-mesh containing glass plate which concerns on this invention. It is sectional drawing explaining the outline of another embodiment of the manufacturing apparatus of the metal-mesh glass plate which concerns on this invention. It is sectional drawing explaining the case where the support body which concerns on this invention is made into the roll shape using a vapor | steam film forming agent. It is sectional drawing explaining the outline of another embodiment of the manufacturing apparatus of the metal-mesh glass plate which concerns on this invention. It is sectional drawing explaining the outline of the manufacturing apparatus of the wire mesh containing glass plate which concerns on a prior art.

Explanation of symbols

1: Molten glass 2: Fore furnace
3: Lip 4: Adjustment gate 5: Flow of molten glass 6: Sagging of molten glass 7: Wire mesh 8: Support body 9: Upper molding roll 10: Lower molding roll 11: Metal mesh-containing glass ribbon 12: Molding guide 13 : Transport roll 17: Pass roller 20: Support (roll)
21: Liquid supply container 30: Molten glass 31 in contact with the upper molding roll 9 before pressing: Molten glass 40 in contact with the lower molding roll 10 before pressing: Steam film 41: Rotating shaft 42: Circumferential surface 43: Roll both ends S: Cavity F: Opening

Claims (10)

A single layer of molten glass flow is passed between an upper molding roll and a lower molding roll to form a glass ribbon, and a wire mesh is inserted into the molten glass flow from the lower side before the roll. It is a manufacturing method of a glass plate with a wire mesh, which is a glass ribbon having a wire mesh, and then slowly cooling and cutting the wire mesh-containing glass ribbon,
The flow of the molten glass in the opening for inserting the wire mesh is supported by a support that is located below the position where the wire mesh is inserted and is not in contact with the lower molding roll. A method for producing a wire mesh-containing glass plate.   The manufacturing method of the glass plate with a metal mesh according to claim 1, wherein the molten glass contact area of the upper molding roll and the molten glass contact area of the lower molding roll are substantially equal.   The manufacturing method of the glass plate with a metal mesh of Claim 1 or 2 which applies the tension | tensile_strength of the horizontal direction to the said metal mesh from the position before inserting in the flow of the said molten glass.   The said support body consists of a rotating roll which has a rotating shaft of the direction orthogonal to the flow direction of the said molten glass, The manufacturing method of the glass plate with a metal mesh in any one of Claims 1-3.   The manufacturing method of the glass plate with a wire mesh according to any one of claims 1 to 4, wherein a gas is interposed between the surface of the support and the surface of the molten glass, and the flow of the molten glass is supported through the gas.   The manufacturing method of the glass plate with a wire mesh according to claim 5, wherein the gas is supplied from the inside of the support to the molten glass side surface.   The manufacturing method of the glass plate with a metal mesh according to claim 5, wherein a liquid is supplied to the molten glass side surface of the support and vaporized.   The manufacturing method of the glass plate with a metal mesh according to claim 5, wherein a liquid is supplied from the inside of the support to the molten glass side surface and vaporized.   The method for producing a wire mesh-containing glass plate according to any one of claims 5 to 8, wherein the molten glass side surface of the support is made of a porous or fibrous material.   The method for producing a wire mesh-containing glass plate according to claim 9, wherein the material is made of carbon, ceramics, or metal.

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