JP7022304B2 - Glass article manufacturing equipment and manufacturing method - Google Patents

Description

The present invention relates to an apparatus and a method for manufacturing a glass article, and more particularly to a technique for improving the thickness dimension distribution of a glass ribbon by improving the lower surface of a molten glass flow of a molded body.

As is well known, thin plate glass used in various fields such as glass substrates for flat panel displays (FPDs) such as liquid crystal displays, plasma displays, and organic EL displays, and cover glasses for organic EL lighting. May require strict product quality against surface defects and waviness.

Therefore, as a method for producing this kind of thin glass, an overflow down draw method is often used in order to obtain a smooth and defect-free glass surface.

Here, as an apparatus for performing molding by the overflow down draw method, for example, as described in Patent Document 1, an overflow groove in which molten glass overflows and a pair of flow-down walls in which the molten glass overflowing from the overflow groove flows down. A molded body provided with and is generally used. Here, each flow-down wall has a vertical plane portion extending in the vertical direction, and a reverse slope portion that is continuous at the vertical plane portion and its lower end, is inclined toward each other as it goes downward, and joins at each lower end. .. Further, as described in Patent Document 2, the flow path width of the molten glass during the flow is defined by standing vertically from the flow wall at both ends in the width direction of the flow wall (vertical surface portion, reverse slope portion). Therefore, a guide surface for guiding the flow of the molten glass is provided.

Japanese Unexamined Patent Publication No. 2013-184876 Japanese Unexamined Patent Publication No. 2017-88446

By the way, as described above, when the guide surfaces are provided at both ends in the width direction of the flow-down wall, for example, when the wettability of the molten glass to the guide surface is relatively high, the molten glass flowing down reaches the guide surface. It is transmitted wet and pulled up by surface tension, and may be biased toward the end in the width direction (Fig. 6). As described above, when the molten glass is pulled up, there is a region where the flow amount of the molten glass is partially insufficient by the amount of the pulled up. In this case, a portion smaller than the desired thickness dimension remains in the product portion of the glass ribbon obtained as a result of molding, and as a result, the thickness dimension of the product may vary in the width direction.

In view of the above circumstances, in the present invention, it is a technical problem to be solved to prevent the situation where the flow amount of the molten glass is insufficient in the width direction as much as possible and suppress the variation in the thickness dimension of the product part. do.

The solution to the above problems is achieved by the apparatus for manufacturing a glass article according to the present invention. That is, this manufacturing apparatus is provided at both ends in the width direction of an overflow groove having a gutter shape and overflowing molten glass, a pair of flowing down walls into which the molten glass overflowing from the overflow groove flows down, and molten glass. A total of two pairs of guides are provided to guide the flow of the glass, and the pair of flow walls are located adjacent to the upper end surface provided with the overflow groove and extending downward with a pair of lower surfaces of the first flow and below the lower surface of the first flow. It is a glass article manufacturing apparatus having a pair of second flow lower surfaces, which are reverse slopes that approach each other and merge at the lower end toward the lower side, and each guide portion is a widthwise end portion of the first flow lower surface. It is characterized by having a first slope that is connected to and has an upslope in the direction away from the lower surface of the first stream in the width direction.

As described above, in the manufacturing apparatus according to the present invention, attention is paid to the first flow lower surface and the guide portions located at both ends in the width direction thereof, which are in contact with the molten glass overflowing from the overflow groove in the flow wall immediately after the flow starts. At the widthwise end of the lower surface of the first stream, a first slope having an upward slope is provided in a direction away from the lower surface of the first stream in the width direction. As a result, the state in which the molten glass is pulled up with respect to the guide portion changes, and for example, the dimension in the thickness direction of the molten glass on the first slope is leveled. Therefore, as in the past, it is possible to prevent the situation where an extremely large portion and a small portion are generated due to pulling up, and a portion having a relatively small thickness dimension remains in the product portion of the molded glass ribbon. It is possible to avoid the situation.

Further, in the manufacturing apparatus according to the present invention, the guide portion further has a guide surface erected with respect to the lower surface of the first stream, and the first slope is a constant width direction connecting the guide surface and the lower surface of the first stream. It may be a bank surface having a certain inclination angle with respect to the dimensions and the lower surface of the first stream. Alternatively, the first slope may be a concave curved surface having a concavely curved cross-sectional shape when viewed in the flow direction of the molten glass.

As described above, if the first slope is a bank surface having a certain width direction dimension and a certain inclination angle, the first slope can be relatively easily provided on the lower surface of the first flow. Alternatively, by making the first slope a concave curved surface curved in a concave shape as described above, the dimensions of the molten glass on the first slope in the thickness direction can be made more uniform.

Further, in the manufacturing apparatus according to the present invention, each guide portion may further have a connecting surface for connecting the upper end surface and the first slope. Further, in this case, the connecting surface may be, for example, an ascending gradient increasing surface in which the ascending gradient increases as it goes downward.

In this way, by further providing a connecting surface connecting the upper end surface where the overflow groove opens and the first slope, the inflow state of the molten glass onto the first slope can be adjusted. For example, as described above, when the connecting surface is an ascending slope increasing surface in which the ascending slope increases downward, the molten glass immediately after overflowing from the overflow groove is first parallel to or nearly parallel to the lower surface of the first flow. It flows onto the surface (upper end of the lower surface of the uphill slope image), gradually becomes an uphill slope, and is guided onto the first slope. This makes it possible to smoothly guide the molten glass onto the first slope and suppress turbulence at the start of flow of the molten glass.

Further, in the manufacturing apparatus according to the present invention, each guide portion may further have a second slope which is connected to both ends in the width direction of the lower surface of the second stream and has an upward slope with respect to the lower surface of the second stream.

As described above, the widthwise end of the lower surface of the second stream located below the lower surface of the first stream is also provided with a second slope having an upward slope with respect to the lower surface of the first stream. As a result, the same action as the first slope continues on the molten glass that has reached the lower surface of the second flow (the state in which the molten glass is pulled up with respect to the guide portion changes, and the thickness direction dimension of the molten glass on the second slope is leveled. ) Can be given. Therefore, it is possible to maintain the above-mentioned action until the glass ribbon merges at the lower end, and more reliably avoid a situation in which a portion having a relatively small thickness dimension remains in the product portion of the glass ribbon.

Further, when the second slope is provided, in the manufacturing apparatus according to the present invention, the first slope and the second slope may be continuously provided along the flow direction of the molten glass and connected to each other. Further, in this case, the first slope and the second slope may be connected via a convex surface portion having a cross-sectional shape curved in a convex shape when viewed in the width direction.

In this way, when the first slope and the second slope are provided on the lower surface of the first flow and the lower surface of the second flow, respectively, by connecting both slopes to each other, a convex surface having a convex curved shape as described above is preferable. By connecting via the portions, the molten glass flowing down on the first slope can be smoothly introduced onto the second slope. This makes it possible to stably obtain the action of the second slope described above.

Further, the solution to the above problems is also achieved by the method for manufacturing a glass article according to the present invention. That is, in this manufacturing method, an overflow groove having a gutter shape and overflowing molten glass, a pair of flowing down walls into which the molten glass overflowing from the overflow groove flows down, and molten glass provided at both ends in the width direction of each flowing down wall. A total of two pairs of guides are provided to guide the flow of the glass, and the pair of flow walls are located adjacent to the upper end surface provided with the overflow groove and extending downward, and below the lower surface of the first flow. A method for manufacturing a glass article, wherein the glass article is manufactured by using a manufacturing apparatus having a pair of second flow lower surfaces, which are reverse slopes that approach each other and merge at the lower end as the glass article is directed downward. Has a first slope that is connected to the widthwise end of the first slope and has an ascending slope in the direction away from the lower surface of the first flow in the width direction, and the molten glass overflows from the overflow groove, so that the molten glass becomes the first. It is characterized by the fact that it flows down while in contact with one slope.

As described above, also in the manufacturing method according to the present invention, the first slope having an upward slope is provided in the direction away from the lower surface of the first flow in the width direction. Therefore, as described above, the molten glass overflowing from the overflow groove flows down while being in contact with the first slopes located at both ends in the width direction of the lower surface of the first flow, so that the state in which the molten glass is pulled up with respect to the guide portion changes, for example. The thickness direction dimension of the molten glass on the first slope is leveled. Therefore, as in the past, it is possible to prevent the situation where an extremely large portion and a small portion are generated due to pulling up, and a portion having a relatively small thickness dimension remains in the product portion of the molded glass ribbon. It is possible to avoid the situation.

Further, in the manufacturing method according to the present invention, the molten glass adjusted to 3000 dPa · s or more and 10000 dPa · s or less in a state where the ascending slope of the first slope is set to 75 ° or more and 85 ° or less is overflowed. It may overflow from the groove.

Alternatively, the molten glass adjusted to 100 dPa · s or less may overflow from the overflow groove with the ascending slope of the first slope set to 5 ° or more and 15 ° or less.

As a result of verifying the relationship between the uphill slope of the first slope and the viscosity of the molten glass according to the present invention, the present inventors have found that there is an appropriate uphill slope range depending on the viscosity range of the molten glass. Specifically, when molten glass having a relatively high viscosity (3000 dPa · s or more and 10,000 dPa · s or less) is used, the uphill slope of the first slope is relatively steep (at 75 ° or more). And by setting it to 85 ° or less, and when using molten glass with a relatively low viscosity (100 dPa · s or less), the uphill slope of the first slope is relatively gentle (5 ° or more). And by setting it to 15 ° or less), it is possible to effectively and stably enjoy the above-mentioned action.

As described above, according to the present invention, it is possible to prevent the situation where the flow amount of the molten glass is insufficient in the width direction as much as possible, and to suppress the variation in the thickness dimension of the product portion.

It is a perspective view of the manufacturing apparatus of the glass article which concerns on 1st Embodiment of this invention. It is a front view of the manufacturing apparatus shown in FIG. FIG. 2 is a cross-sectional view taken along the line AA of the manufacturing apparatus shown in FIG. It is BB sectional view of the manufacturing apparatus shown in FIG. It is (a) CC sectional view and (b) DD sectional view of the manufacturing apparatus shown in FIG. It is sectional drawing of the main part of the manufacturing apparatus which schematically depicts the flow | flow mode of the molten glass when the guide part of the conventional structure is used. It is sectional drawing of the main part of the manufacturing apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing of the main part of the manufacturing apparatus which concerns on 3rd Embodiment of this invention. It is a front view of the manufacturing apparatus which concerns on 4th Embodiment of this invention. 9A is a cross-sectional view taken along the line EE and (b) is a cross-sectional view taken along the line FF of the manufacturing apparatus shown in FIG. It is (a) EE sectional view and (b) FF sectional view of the manufacturing apparatus which concerns on 5th Embodiment of this invention. It is a front view of the manufacturing apparatus which concerns on 6th Embodiment of this invention. 12 is a cross-sectional view taken along the line (a) EE and (b) a cross-sectional view taken along the line FF of the manufacturing apparatus shown in FIG. It is an enlarged vertical sectional view of the main part of the manufacturing apparatus which concerns on 7th Embodiment of this invention.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings.

(First Embodiment of the present invention)
As shown in FIGS. 1 and 2, the apparatus for manufacturing a glass article according to the first embodiment of the present invention includes a molded body 1 for carrying out molding by an overflow down draw method.

The molded body 1 has a long shape in a direction corresponding to the width direction of the glass article (here, a plate glass or a glass sheet) to be manufactured. An upper end surface 2 facing vertically upward is provided on the top of the molded body 1, and an overflow groove 3 formed along the longitudinal direction thereof (that is, the width direction of the molded body 1) is formed on the upper end surface 2. There is. A pair of flow-down walls 4 and 4 are provided on both sides in a direction orthogonal to the width direction of the molded body 1, that is, in the lateral direction of the overflow groove 3. The molten glass Gm that overflows from the overflow groove 3 flows down along each downflow wall 4. In the present embodiment, in the XYZ Cartesian coordinate system shown in FIG. 1, the X direction and the Y direction are horizontal directions, and the Z direction is a vertical direction. In this case, the X direction is the above-mentioned "width direction", and the Y direction is the above-mentioned "direction orthogonal to the width direction". The same applies to FIGS. 2 and later.

A supply pipe 5 is connected to one end side of the overflow groove 3 in the width direction. The molten glass Gm is supplied into the overflow groove 3 through the supply pipe 5. Of course, the method of supplying the molten glass Gm is not limited to this, and for example, the molten glass Gm may be supplied from both ends in the longitudinal direction of the overflow groove 3.

Each of the pair of downflow walls 4 has a first flow lower surface 6 and a second flow lower surface 7 located below the first flow lower surface 6, as shown in FIG. Each of the first flow lower surfaces 6 and 6 is adjacent to the upper end surface 2 provided with the overflow groove 3 and extends downward while maintaining a certain distance from each other. The lower surfaces 7 and 7 of the second stream are inclined in opposite directions so as to approach each other toward the lower side, and meet at the lower end portion 7a. At this time, the lower end portion 7a is composed of a straight portion extending in the width direction. In the present embodiment, the lower surfaces 6 and 6 of the first stream extend in the vertical direction, but may have a slight inclination with respect to the vertical direction. Further, the lower surfaces 7 and 7 of the second flow are set to a predetermined inclination angle according to the thickness dimension of the glass article (here, the glass ribbon Gr) to be molded.

A total of two pairs of guide portions 8 and 8 (a pair for each flow down wall 4) are provided at both ends in the width direction of the molded body 1 to guide both ends in the width direction of the molten glass Gm flowing down each flow down wall 4. ing. Although not shown, each guide portion 8 is fixed to the molded body 1 by fitting the fitting recess provided in the guide portion 8 into the widthwise end portion of the molded body 1 from the outside.

Here, as shown in FIG. 1, each guide portion 8 is connected to both end portions 6a, 6a in the width direction of the first flow lower surface 6, and has an upward slope in a direction away from the first flow lower surface 6 in the width direction. Has 9,9. In the present embodiment, as shown in FIG. 4, the first slopes 9 and 9 have a constant ascending slope from the widthwise central portion 6b side of the first flow lower surface 6 toward the widthwise end portion 6a side. It is tilted. Further, the first slopes 9 and 9 are both provided over the entire flow direction (here, the Z direction) of the first flow lower surface 6, and the inclination angle θ1 with respect to the first flow lower surface 6 of each first slope 9 is the longitudinal direction (here). In the Z direction), it is constant over the entire area. Further, the widthwise dimension L1 of each first slope 9 is also constant over the entire longitudinal direction thereof. In this case, the first slopes 9 and 9 can be said to be bank surfaces that regulate the flow of the molten glass Gm on the outside in the width direction.

The inclination angle θ1 of the first slope 9 is preferably set according to the viscosity of the molten glass Gm to be used. As an example, when molten glass Gm having a viscosity of 3000 dPa · s or more and 10000 dPa · s or less overflows from the overflow groove 3, the inclination angle θ1 of the first slope 9 is set to 75 ° or more and 85 ° or less. Is good. Further, when the molten glass Gm having a viscosity of 100 dPa · s or less overflows from the overflow groove 3, it is preferable to set the inclination angle θ2 of the first slope 9 to 5 ° or more and 15 ° or less.

The glass that can be used in the present invention is not particularly limited as long as the viscosity can be set within the above range. As an example, a phosphate-based glass containing substantially no fluorine (for example, a fluorine content ratio of 0.1% or less in mass%) can be mentioned. The glass composition thereof is, for example, P ₂ O ₅ : 25 to 60%, Al ₂ O ₃ : 2 to 19%, RO (where R is selected from Mg, Ca, Sr and Ba) in mass%. At least one type): 5 to 45%, ZnO: 0 to 13%, K ₂ O: 8 to 20%, Na ₂ O: 0 to 12%, and Cu O: 0.3 to 20%.

Further, as shown in FIG. 1, each guide portion 8 is connected to both end portions 7b in the width direction of the second flow lower surface 7, and the second slope 10 has an ascending slope in a direction away from the second flow lower surface 7 in the width direction. , 10. In the present embodiment, as shown in FIGS. 5A and 5B, the second slopes 10 and 10 are directed from the widthwise central portion 7c side of the second flow lower surface 7 to the widthwise both end portions 7b side. It is inclined so that it becomes a constant uphill slope. Further, the second slopes 10 and 10 are both provided over the entire flow direction (here, the Z direction) of the second flow bottom surface 7, and the inclination angle θ2 with respect to the second flow bottom surface 7 of each second slope 10 is the longitudinal direction thereof. It is constant over the entire area (here, in the Z direction) (see FIGS. 5 (a) and 5 (b)). On the other hand, on the second slope 10, the width dimension constant portion 10a (see FIG. 2) in which the width direction dimension L2 is constant and the width dimension reduction portion 10b (see FIG. 2) in which the width direction dimension L2 decreases at a constant rate as the width direction dimension L2 moves downward. 5 (a) and 5 (b)). In this case, the widthwise dimension L2 of the second slope 10 becomes zero at the lower end portion 7a of the second flow lower surface 7, and the widthwise dimension of the second flow lower surface 7 increases as it approaches the lower end portion 7a.

Further, as shown in FIGS. 1 and 3, the second slopes 10 and 10 are connected to the first slopes 9 and 9 via the bent portion 11. The first slope side region 11a of the bent portion 11 is on the same plane as the first slope 9, and the second slope side region 11b of the bent portion 11 is on the same plane as the second slope 10.

Next, a method of manufacturing a flat glass by the manufacturing apparatus configured as described above will be described.

First, as shown in FIGS. 1 and 3, the molten glass Gm overflows from the overflow groove 3 on both sides in the lateral direction (Y direction). Then, the overflowing molten glass Gm is supplied onto the pair of downflow walls 4 and 4, and the molten glass Gm is allowed to flow down along the first flow lower surface 6 and the second flow lower surface 7 forming each of the downflow walls 4. In this way, the molten glass Gm flowing down the lower surface 7 of the second flow and the molten glass Gm flowing down the lower surface 7 of the other second flow are fused and integrated at the lower end 7a to form a single glass ribbon Gr. It is continuously molded.

Here, as shown in FIG. 6, when the guide portion 8 has only the guide surface 8a that stands perpendicular to the first flow lower surface 6 as in the conventional case, the first flow lower surface is accompanied by the flow of the molten glass Gm. The molten glass Gm may be pulled up to the guide surface 8a provided adjacent to both ends 6a and 6a in the width direction of 6. Since the amount of flow of the molten glass Gm is appropriately controlled according to the specifications of the target molded product (for example, the thickness dimension of the plate glass), as described above, the molten glass Gm is guided to both ends in the width direction. When the pulled-up portion Gm1 by the surface 8a is generated, a region Gm2 in which the flow amount of the molten glass Gm is insufficient by the amount pulled up is generated in the width direction. This is not preferable because a portion having a thickness smaller than that of the periphery may remain in the product portion of the glass ribbon Gr obtained as a result of molding.

On the other hand, in the molded body 1 according to the present invention, each guide portion 8 is connected to both end portions 6a and 6a in the width direction of the first flow lower surface 6, and the slope is upward in the direction away from the first flow lower surface 6 in the width direction. The first slope 9 is provided (see FIG. 4). As a result, as described above, the molten glass Gm overflowing from the overflow groove 3 flows down while being in contact with the first slopes 9 and 9 located at both ends 6a and 6a in the width direction of the first flow lower surface 6, thereby causing the guide portion 8 to flow down. The pulling state of the molten glass Gm changes with respect to, for example, the thickness direction dimension of the molten glass Gm on the first slope 9 is leveled. Therefore, as in the conventional case, the situation where an extremely large portion (pulled portion Gm1) and a small portion (region Gm2 in which the flow amount is insufficient) is generated due to the pulling is prevented as much as possible, and the glass ribbon Gr that is formed is formed. It is possible to avoid a situation in which a portion having a relatively small thickness dimension remains in the product portion of the above.

Although the first embodiment of the present invention has been described above, the manufacturing apparatus and manufacturing method for the glass article according to the present invention are not limited to the above embodiments, and various forms are adopted within the scope of the present invention. It is possible.

(Second Embodiment of the present invention)
FIG. 7 shows a cross-sectional view (XY cross-sectional view) when the molded body 21 according to the second embodiment of the present invention is cut along the width direction thereof. As shown in FIG. 7, the molded body 21 according to the present embodiment has first slopes 22 and 22 having a shape different from that of the first embodiment in the guide portion 8. More specifically, the first slope 22 has a cross-sectional shape (XY cross-sectional shape) that is concavely curved when viewed in the flow direction (Z direction) of the molten glass Gm. In this case, the ascending gradient increases from the central portion 6b side in the width direction toward the both end portions 6a side in the width direction. The elements substantially the same as those described in the first embodiment are designated by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted. The same applies to the third and subsequent embodiments described later.

As described above, even if the first slope 9 has a concavely curved cross-sectional shape, it is possible to suppress the extreme pulling up of the molten glass Gm and to smooth the distribution of the dimensions in the thickness direction.

Of course, the shape of the first slope 9 (22) is arbitrary, and for example, although not shown, the uphill slope is intermittently increased from the width direction center portion 6b side to the width direction end portion 6a side of the first flow lower surface 6. It may have a shape to have. Alternatively, two types of inclined planes having different inclination angles may be connected in the width direction, and the concave curved surface (for example, the first slope 22 according to the second embodiment) and the inclined plane described above may be connected in the width direction. It may be in a connected form.

Although not shown, the first slope 9 (22) does not necessarily have to be provided over the entire flow direction (Z direction) of the first flow lower surface 6, and if necessary, the flow direction of the first flow lower surface 6. The first slope 9 (22) may be provided only on a part of the above. Further, the inclination angle θ1 with respect to the lower surface 6 of the first flow of the first slope 9 (22) does not necessarily have to be constant over the entire longitudinal direction thereof, and for example, the inclination angle θ1 may decrease as it goes downward. Further, the widthwise dimension L1 of the first slope 9 (22) does not necessarily have to be constant over the entire longitudinal direction thereof. For example, like the second slope 10 shown in FIG. 2, it is located relatively upward and has a widthwise dimension. The first slope 9 (22) may be formed by a constant width dimension portion where L1 is constant and a width dimension decrease portion which is located relatively downward and decreases as the width direction dimension L1 decreases downward.

(Third Embodiment of the present invention)
FIG. 8 shows a cross-sectional view of the molded body 31 according to the third embodiment of the present invention. The molded body 31 is connected to the first slope 9 having a predetermined inclination angle θ1 (<90 °) with respect to the first flow lower surface 6, the first slope 9 and its widthwise outer end portion 9a, and is connected to the first flow lower surface 6 The guide portion 8 has a guide surface 32 that stands perpendicular to the guide surface 32.

In this way, by further providing the guide surface 32 connected to the outer end portion 9a in the width direction of the first slope 9, the flow amount of the molten glass Gm on the first slope 9 is large even when the flow amount is large. The thickness direction dimension at the widthwise end portion of the molten glass Gm can be made as uniform as possible while allowing a large number of states.

Of course, also in this case, the form of the first slope 9 to be combined with the guide surface 32 is arbitrary, and for example, the first slope 22 and the guide surface 32 in the form shown in FIG. 7 may be combined.

(Fourth Embodiment of the present invention)
FIG. 9 shows a front view of the molded body 41 according to the fourth embodiment of the present invention. Each guide portion 8 further has a connecting surface 42 connecting the upper end surface 2 and the first slope 9. In this case, the upper end portion of the connecting surface 42 is connected to the lateral end portion of the upper end surface 2 of the molded body 41, and the lower end portion of the connecting surface 42 is connected to the upper end portion of the first slope 9. As shown in FIGS. 10A and 10B, for example, the ascending gradient of the first flow lower surface 6 from the widthwise central portion 6b side to the widthwise end portion 6a side increases in the connecting surface 42 as it goes downward. It is an uphill slope increasing surface. The inclination angle θ3 with respect to the first flow lower surface 6 of the connection surface 42 is constant over the width direction thereof. On the other hand, the inclination angle θ3 increases downward, and at the lower end thereof, it becomes equal to the inclination angle θ1 of the first slope 9.

Further, the widthwise dimension L3 of the connecting surface 42 increases at a constant rate as it goes downward (see FIGS. 10A and 10B), and the widthwise dimension L1 of the first slope 9 is formed at the lower end thereof. Become equal. In the present embodiment, the widthwise dimension L3 of the connecting surface 42 is zero at the upper end portion thereof, but the widthwise dimension L3 increases as it goes downward from the state having a constant widthwise dimension L3 at the upper end portion. It is also possible to take the form.

In this way, by providing the connecting surface 42 connecting the upper end surface 2 and the first slope 9 between the upper end surface 2 and the first slope 9 where the overflow groove 3 opens, the first slope of the molten glass Gm is provided. 9 The inflow state to the top can be adjusted. For example, by making the connecting surface 42 an ascending slope increasing surface in which the ascending slope (inclination angle θ3 with respect to the first flow lower surface 6) increases downward (see FIGS. 10A and 10B), the overflow groove 3 Immediately after overflowing from the molten glass Gm, the molten glass Gm first flows into the region of the connecting surface 42 having a gradient parallel to or close to the first flow lower surface 6, and gradually becomes an upward gradient and is guided onto the first slope 9. .. This makes it possible to smoothly guide the molten glass Gm onto the first slope 9 and enjoy the pull-up suppressing action of the first slope 9 while suppressing the turbulence at the start of the flow of the molten glass Gm.

(Fifth Embodiment of the present invention)
The connecting surface 42 may take a form other than the above-mentioned uphill gradient increasing surface. 11 (a) and 11 (b) show an XY sectional view of a connecting surface 42 according to a fifth embodiment of the present invention. As shown in FIG. 11, the connecting surface 42 according to the present embodiment is a width dimension increasing surface in which the width direction dimension L4 increases toward the downward direction. On the other hand, the inclination angle θ4 of each connection surface 42 with respect to the first flow lower surface 6 is constant over the entire longitudinal direction (here, the Z direction). In this case, since the width direction region having an uphill slope increases downward, the molten glass Gm overflowing from the overflow groove 3 can be smoothly guided onto the first slope 9.

(Sixth Embodiment of the present invention)
12 is a front view of the molded body 41 according to the sixth embodiment of the present invention, and FIGS. 13 (a) and 13 (b) are XY cross-sectional views of the connecting surface 42. As shown in FIG. 13, the connection surface 42 according to the present embodiment is an upslope increasing surface in which the uphill slope (inclination angle θ5 with respect to the first flow lower surface 6 increases) as it goes downward, as in FIG. As shown in FIG. 12, the widthwise dimension L5 of each connecting surface 42 is constant over the entire longitudinal direction and is equal to the widthwise dimension L1 of the first slope 9. By defining the shape of the connecting surface 42 in this way. It is possible to further enhance the pull-up suppressing action of the first slope 9 while effectively suppressing the turbulence at the start of the flow of the molten glass Gm.

(Seventh Embodiment of the present invention)
FIG. 14 shows a vertical sectional view of the molded body 51 according to the seventh embodiment of the present invention. As shown in FIG. 14, in this molded body 51, the guide portion 8 has the first slope 9 and the second slope 10, and the first slope 9 and the second slope 10 are different from the first embodiment. It is connected in form. That is, in the first embodiment, the first slope 9 and the second slope 10 are connected via the bent portion 11 (see FIG. 3), whereas in the present embodiment, when viewed in the width direction. It is connected via a convex surface portion 52 having a convexly curved cross-sectional shape (YZ cross-sectional shape). The heights of the first slope 9 and the second slope 10 (distance in the normal direction from the first flow lower surface 6 and the second flow lower surface 7) may be the same or different as shown in FIG. May be.

In this way, when the first slope and the second slope are provided on the lower surface of the first flow and the lower surface of the second flow, respectively, by connecting both slopes, it is preferable to form a convex surface having a convex curved cross-sectional shape as described above. By connecting via the portions, the molten glass flowing down on the first slope can be smoothly introduced onto the second slope. This makes it possible to stably obtain the action of the second slope described above.

1,21,31,41,51 Molded body 2 Upper end surface 3 Overflow groove 4 Flow down wall 5 Supply pipe 6 First flow lower surface 7 Second flow lower surface 8 Guide part 8a Guide surface 9, 22 First slope 10 Second slope 10a Width Constant dimension part 10b Width dimension decrease part 32 Vertical surface 42 Gradient increase surface 52 Convex surface part Gm Molten glass Gm1 Pulling part Gm2 Area where molten glass is insufficient Gr Glass ribbon

Claims (12)

An overflow groove that has a gutter shape and overflows the molten glass, a pair of flow-down walls through which the molten glass overflows from the overflow groove flows down, and the flow-down of the molten glass provided at both ends in the width direction of each of the flow-down walls. Equipped with a total of two pairs of guides to guide
The pair of downflow walls are located below the pair of first flow bottom surfaces that are adjacent to the upper end surface provided with the overflow groove and extend downward, and approach each other as they go downward and merge at the lower end. A device for manufacturing a glass article, which has a pair of second flow lower surfaces that are reverse slopes.
Each of the guide portions is connected to the widthwise end portion of the lower surface of the first stream, and has an ascending slope that rises from the lower surface of the first stream toward the side where the molten glass flows down as the surface moves away from the lower surface of the first stream in the width direction. A device for manufacturing a glass article, characterized by having a first slope. The guide portion further has a guide surface erected with respect to the lower surface of the first flow.
The apparatus for manufacturing a glass article according to claim 1, wherein the first slope is a bank surface connecting the guide surface and the lower surface of the first stream and having a constant width direction dimension and a constant inclination angle with respect to the lower surface of the first stream. .. The apparatus for manufacturing a glass article according to claim 1, wherein the first slope is a concave curved surface having a concavely curved cross-sectional shape when viewed in the flow direction of the molten glass. The apparatus for manufacturing a glass article according to claim 1, wherein each guide portion further has a connecting surface connecting the upper end surface and the first slope. The apparatus for manufacturing a glass article according to claim 4, wherein the connecting surface is an ascending gradient increasing surface in which the ascending gradient increases as it goes downward. Each of the guide portions is connected to both ends in the width direction of the lower surface of the second stream, and has an ascending slope that rises from the lower surface of the second stream toward the side where the molten glass flows down as the distance from the lower surface of the second stream increases in the width direction. The apparatus for manufacturing a glass article according to any one of claims 1 to 4, further comprising a second slope. The apparatus for manufacturing a glass article according to claim 6, wherein the first slope and the second slope are continuously provided along the flow direction of the molten glass and are connected to each other. The apparatus for manufacturing a glass article according to claim 7, wherein the first slope and the second slope are connected via a convex surface portion having a cross-sectional shape that is convexly curved when viewed in the width direction. The apparatus for manufacturing a glass article according to any one of claims 1 to 8, wherein at least the first slope and the lower surface of the first flow are coated with platinum or a platinum alloy. An overflow groove that has a gutter shape and overflows the molten glass, a pair of flow-down walls through which the molten glass overflows from the overflow groove flows down, and the flow-down of the molten glass provided at both ends in the width direction of each of the flow-down walls. Equipped with a total of two pairs of guides to guide
The pair of downflow walls are located below the pair of first flow bottom surfaces that are adjacent to the upper end surface provided with the overflow groove and extend downward, and approach each other as they go downward and merge at the lower end. It is a method of manufacturing a glass article, which manufactures a glass article by using a manufacturing apparatus having a pair of second flow lower surfaces which are reverse slopes.
Each of the guide portions is connected to the widthwise end of the lower surface of the first stream, and rises from the lower surface of the first stream toward the side where the molten glass flows down as the lower surface of the first stream moves away from the lower surface of the first stream in the width direction. It has a first slope that becomes a slope,
A method for manufacturing a glass article, wherein the molten glass overflows from the overflow groove so that the molten glass flows down while being in contact with the first slope. 10. Claim 10 for overflowing the molten glass adjusted to 3000 dPa · s or more and 10000 dPa · s or less in a state where the ascending slope of the first slope is set to 75 ° or more and 85 ° or less. The method for manufacturing a glass article according to. The glass article according to claim 10, wherein the molten glass adjusted to 100 dPa · s or less overflows from the overflow groove in a state where the uphill slope of the first slope is set to 5 ° or more and 15 ° or less. Production method.

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