JP2005035835A - Method for forming discharge port of glass panel and discharge port forming member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure excellent air tightness as a discharge port. <P>SOLUTION: When the discharge port 6 for discharging a gas in a tightly closed gap part V between a pair of plate glasses 1 to the outside is provided on one plate glass 1A in the plate glasses 1 arranged with a certain interval in the thickness direction, a throughhole 3 is provided on one plate glass 1A and a discharging glass tube 7 is erected in the throughhole 3. A seal part K is formed by externally engaging an annular sealing formed body 8 to a base end part of the glass tube 7 and heating and melting the sealing formed body 8 to flow over the base end part of the glass tube 7 and the throughhole peripheral part 1a of one plate glass 1A and solidifying. The seal part is formed by setting the dimensional relation between the sealing formed body 8 and the discharging glass tube 7 to be (the height of the formed body)/(the thickness in the diameter direction)≥0.44 and (the height of the formed body)/(the gap between the sealing formed body and the glass tube)≥7.0. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, when forming a glass panel in which a hollow portion between a pair of plate glasses is depressurized (or filled with gas) (for example, a reduced pressure double-glazed glass or a plasma display panel), the hollow portion is depressurized. In more detail, it relates to a technology for forming a discharge port in the glass panel body, and more specifically, in one of the pair of plate glasses arranged at intervals in the thickness direction, in a sealed gap between the two plate glasses. In providing a discharge port for discharging the gas to the outside, the one plate glass is provided with a through hole, a discharge glass tube is erected in the through hole, and a circular end is formed at the base end of the glass tube. A sealing molded body is externally fitted, and the sealing molded body is heated and melted to flow and solidify over the base end portion of the glass tube and the peripheral edge portion of the one plate glass. Outlet forming method of a glass panel to form a Lumpur unit, and to a discharge port forming member for use in the method.

Conventionally, as this type of glass panel discharge port forming technology, detailed specifications are set for the management of the maximum temperature when heat-melting the molding for sealing and the heating management for defining the relationship between temperature and time. However, no special provision has been made regarding the relative dimensions of the molded body for sealing and the glass tube for discharging.
Therefore, the sealing molded body and the discharge glass tube are arranged so that the annular sealing molded body can be fitted outside in the state in which the discharging glass tube stands in the through hole of the plate glass (the outer diameter of the glass tube). ) <(Inner diameter of the molded article for sealing) was the only condition, and there were no other regulations.
Such a conventional technique is widely known among those skilled in the art, and there is no patent document or the like that specifically refers to the dimension setting of the sealing molded body and the discharge glass tube. Technical literature is not shown.

  According to the conventional glass panel discharge port forming technique described above, the seal molding 8 is fitted on the discharge glass tube 7 erected as shown in FIG. When 8 is heated and melted, as shown in FIG. 11 (b), not only those that flow and solidify in a good state in close contact with both the peripheral edge 1a of the through-hole and the discharge glass tube 7, As shown in FIG. 11 (c), it may solidify in a state where there is little contact with the glass tube 7 for discharge only by flowing mainly on the surface of the peripheral edge 1a of the through hole. There is a problem that the adhesiveness between the glass tube 7 and the seal portion K tends to be poor, and the sealing performance as a discharge port is lowered.

  Accordingly, an object of the present invention is to provide a glass panel discharge port forming technique capable of solving the above-mentioned problems and ensuring a good sealing property as a discharge port.

According to the first aspect of the present invention, the exhaust gas for exhausting the gas in the sealed gap between the two glass sheets to any one of the pair of glass sheets arranged at intervals in the thickness direction is provided. In providing the outlet, the one plate glass is provided with a through hole, a discharge glass tube is erected in the through hole, and an annular sealing molded body is externally fitted to the base end of the glass tube, In the method for forming a glass panel outlet, the sealing body is heated and melted to flow over the base end portion of the glass tube and the peripheral edge portion of the through hole of the one plate glass and solidify to form a seal portion. The dimensions of the seal molding and the discharge glass tube are set as follows to form the seal portion.
H / W ≧ 0.44
H / S ≧ 7.0
However,
H: Height of the molded body for sealing (mm)
W: (φ ₂ −φ ₁ ) / 2 (Diameter thickness dimension of the molded article for sealing) (mm)
S: (φ ₁ −G) / 2 (Dimension of gap between sealing molded body and glass tube) (mm)
φ ₁ : Inner diameter (diameter) dimension (mm) of seal molding
φ ₂ : Outer diameter (diameter) dimension (mm) of the molded article for sealing
G: Outer diameter (diameter) of glass tube (mm)

According to the characteristic configuration of the invention of claim 1, the H / W that defines a good flow state of the sealing molded body from the cross-sectional shape of the sealing molded body, and the gap between the sealing molded body and the discharge glass tube It can be obtained by both equations of H / S defined from the cross-sectional shape of the space, and the seal portion can be formed in a good shape.
As a result, the melted molded article for sealing flows into a state where it sufficiently comes into contact with any surface of the discharge glass tube and the peripheral edge of the through hole of one plate glass, so that a high-quality sealing part can be formed. Thus, it becomes possible to reduce the sealing failure rate.
Incidentally, the constants that define both of the above equations are obtained based on the quality of sealing performance of a large number of samples.
Here, additional explanation will be given for both of the above equations.
The relationship H / W indicates the cross-sectional dimension that tends to flow toward the discharge glass tube when the sealing molded body is melted, and the vertically long shape flows more than the flat shape. As a result, it was concluded that H / W ≧ 0.44 is preferable based on the tendency that the width becomes large.
The relationship H / S is based on the tendency that if the sealing molded body is too far from the discharge glass tube for its height, the molten sealing molded body will not easily flow to the position of the discharge glass tube. As a result, it was concluded that H / S ≧ 7.0 is preferable.

  The characteristic configuration of the invention of claim 2 resides in that a gap dimension S between the sealing molded body and the discharge glass tube is set to 0.05 mm or more.

According to the characteristic configuration of the invention of claim 2, in addition to being able to achieve the function and effect of the invention of claim 1, if the gap dimension S is too small, the sealing molded body is attached to the discharge glass tube. When fitting, mutual contact resistance tends to be too large. However, since the object is made of glass that is easily broken, it cannot be forcedly fitted, and it is necessary to perform the fitting work carefully.
Then, it was found that setting the gap dimension S to 0.05 mm or more as the limit point makes it difficult for the fitting work to be taken, and as a result, it has become possible to obtain good wearability.

According to a third aspect of the present invention, there is provided a discharge port forming member for use in the glass panel discharge port forming method according to the first or second aspect, wherein the sealing molded body and the discharge glass tube are used. The settings are as follows.
H / W ≧ 0.44
H / S ≧ 7.0
However,
H: Height of the molded body for sealing (mm)
W: (φ ₂ −φ ₁ ) / 2 (Diameter thickness dimension of the molded article for sealing) (mm)
S: (φ ₁ −G) / 2 (Dimension of gap between sealing molded body and glass tube) (mm)
φ ₁ : Inner diameter (diameter) dimension (mm) of seal molding
φ ₂ : Outer diameter (diameter) dimension (mm) of the molded article for sealing
G: Outer diameter (diameter) of glass tube (mm)

According to the characteristic configuration of the invention of claim 3, H / W which defines a good flow state of the sealing molded body from the cross-sectional shape of the sealing molded body, and a gap between the sealing molded body and the discharge glass tube It can be obtained by both equations of H / S defined from the cross-sectional shape of the space, and the seal portion can be formed in a good shape.
As a result, the melted molded article for sealing flows into a state where it sufficiently comes into contact with any surface of the discharge glass tube and the peripheral edge of the through hole of one plate glass, so that a high-quality sealing part can be formed. Thus, it becomes possible to reduce the sealing failure rate.
Incidentally, both the above-described equations are obtained based on the quality of the sealing performance of a large number of samples, as mentioned in the explanation of the function and effect related to the invention of claim 1.

  The characteristic configuration of the invention of claim 4 resides in that a gap dimension S between the sealing molded body and the discharge glass tube is set to 0.05 mm or more.

  According to the characteristic configuration of the invention of claim 4, in addition to being able to achieve the function and effect of the invention of claim 3, as mentioned in the explanation of the function and effect of the invention of claim 2, the glass tube for discharge As a result, it is possible to obtain a good mounting property.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

  FIGS. 1-6 shows the glass panel P formed using the "glass panel discharge port formation technology" of this invention, and a glass panel P is a space | interval along a plate surface between a pair of plate glass 1. With respect to the glass panel main body P1 formed with a plurality of spacers 2 interposed therebetween, the sealed gap V between the two glass plates 1A and 1B is sealed under reduced pressure.

Each of the pair of plate glasses 1 is composed of a transparent float plate glass having a thickness dimension of 3 mm (3 mm plate glass as defined in JIS standard, which is substantially 2.7 to 3.3 mm in consideration of a thickness error). In addition, a sealing portion 4 of low melting point glass (for example, solder glass) is provided over the entire outer periphery of the both glass plates 1 so as to seal the sealing gap V. And the said airtight space | gap part V is comprised in the state which exhibits the reduced pressure environment of about 1.33 Pa (1.0 * 10 ^<-2 > Torr) or less by the method of attracting | sucking from the discharge port 6 formed in one plate glass 1A. is there.
Incidentally, the outer peripheral edge part of both plate glass 1 is arrange | positioned in the state which one plate glass 1A protrudes along a plate | board surface direction, and formation of the said sealing part 4 by forming this protrusion part 5 is formed. Sometimes, it becomes possible to efficiently and reliably seal the outer peripheral portion of the sealed void portion V in a state where a sealing member (for example, the low melting point glass) is placed on the protruding portion 5.

The spacer 2 uses a material having a compressive strength of about 4.9 × 10 ⁸ Pa (5 × 10 ³ kgf / cm ² ) or more, for example, stainless steel (SUS304), and has a diameter of 0.3 mm to 1. A cylindrical shape having a height of about 0 mm and a height of about 0.15 mm to 1.0 mm is preferable, and the interval between the spacers 2 is preferably about 20 mm.

Next, decompression of the sealed void portion V will be described with reference to FIG.
One of the glass plates 1A of the pair of glass plates 1 is provided with a discharge port 6 for reducing the pressure of the sealed void portion V. This discharge port 6 has a discharge glass tube (hereinafter simply referred to as a glass tube) 7 disposed in the through hole 3 formed in the one plate glass 1A, and the space between the peripheral wall of the through hole 3 and the glass tube 7 is low. A molded body 8 for sealing, in which a melting point glass is formed into an annular shape, is melt-solidified and hermetically connected. And the front-end | tip part 7a of the said glass tube 7 is comprised in the obstruction | occlusion part C which heat-melted and obstruct | occluded after pressure reduction (refer FIG. 6).

Specifically, as shown in FIGS. 2 and 3, the glass tube 7 is erected on the sheet glass 1 </ b> A so as to communicate with the through-hole 3, and the glass tube 7 is disposed around the erected portion of the glass tube 7. A sealing molded body 8 made of a material having a lower melting point (here, low melting point glass) is disposed.
That is, as shown in FIG. 3, the through-hole 3 has a large-diameter hole 3a having a diameter of about 2.1 mm and a small-diameter hole 3b having a diameter of about 1.4 mm on one plate glass 1A on the same axis. They are formed in a continuous state.
Further, a glass tube 7 is erected in the large-diameter hole 3a, and is used for a seal formed into a donut shape having a thickness H = 1.1 mm, an outer diameter φ ₂ = 6 mm, and an inner diameter φ ₁ = 2.3 mm. The molded body 8 is arranged on the glass tube 7 in an externally fitted state.

  On the other hand, the glass tube 7 is set to have an outer diameter G = 2.06 mm, a height of 6 mm or less, and a thickness of 0.1 to 1.0 mm in the embodiment. Is preferred. In other words, if a material with a thickness exceeding 1.0 mm is used, it takes time from the temperature rise to self-bonding when the tip 7a is closed, and the temperature rises to unnecessary parts in the surrounding area. Has a risk of cracking the glass sheet 1 or the molded article 8 for sealing due to the resulting temperature gradient. Further, when a material having a thickness of less than 0.1 mm is used, the temperature can be easily raised, but it is difficult to maintain its shape by self-melting, and it is very easy to break because of its low strength.

In forming the seal portion K by flowing the sealing molded body 8 by heating and melting, the dimensions of the sealing molded body 8 and the glass tube 7 are set so as to satisfy the following three conditions. is there. According to these settings, as shown in Examples described later, it is preferable in terms of discharge port formation efficiency and sealing effect.
H / W ≧ 0.44
H / S ≧ 7.0
S ≧ 0.05mm
However,
H: Height of the molded body for sealing (mm)
W: (φ ₂ −φ ₁ ) / 2 (Diameter thickness dimension of the molded article for sealing) (mm)
S: (φ ₁ −G) / 2 (Dimension of gap between sealing molded body and glass tube) (mm)
φ ₁ : Inner diameter (diameter) dimension (mm) of seal molding
φ ₂ : Outer diameter (diameter) dimension (mm) of the molded article for sealing
G: Outer diameter (diameter) of glass tube (mm)

  After installing the glass tube 7 and the sealing molded body 8 as described above, in this embodiment, the environmental temperature is raised until the sealing molded body 8 is melted and fluidized, and then cooled. The seal part K which solidified and bonded the glass tube 7 to the plate glass 1A can be formed.

  Then, the closed space C is sucked through the glass tube 7 as appropriate, and the distal end portion 7a of the glass tube 7 is heated and melted while the closed space V is kept in a reduced pressure state, thereby the closed portion C. (See FIG. 6).

As shown in FIG. 5, the glass panel P is horizontally supported so that the glass sheet 1A is on the upper side in the heating furnace B, as shown in FIG. The suction cup A2 of the suction sealing device A is placed on the surface to cover the glass tube 7.
In the suction sealing device A, a flexible pipe A3 for sucking and discharging the gas in the sealed gap V is connected to the lateral side portion of the bottomed cylindrical suction cup A2, and a plate glass 1A is connected to the tip of the suction cup A2. An elastic O-ring A4 that seals between the plate surfaces of the glass tube 7 is provided, and an electric heater A5 that heats and melts the tip 7a of the glass tube 7 is provided inside the bottom of the suction cup A2.
Then, the tip of the suction cup A2 is brought into close contact with the plate surface of the plate glass 1A through the O-ring A4 and heated to, for example, about 200 ° C. to activate the inside of the sealed gap V, and the sealed gap through the flexible pipe A3 The gas in V is sucked and discharged, and the sealed gap V is decompressed.
Next, the tip 7a of the glass tube 7 was melted by local heating (about 1000 ° C.) with the electric heater A5, and the through hole 3 was sealed as shown in FIG. 6 and cooled in this state. Thereafter, a protective cap 10 covering the molten glass tube 7 is bonded to the glass sheet 1A.
Regarding the blocking of the tip portion 7a, the tip portion 7a is locally heated (about 1000 ° C.), but in order to prevent melting by direct contact of the heat rays with the sintered seal portion K, As shown in FIG. 5, the heat shield plate 11 is disposed in a state of covering the seal portion K.

〔Example〕
As shown in FIGS. 7 and 8, a large number of the molded body 8 for sealing and the glass tube 7 are prepared for each of six types of dimension settings, and the molded body 8 for sealing to the glass tube 7 for each group. Experiments were carried out on the mounting property when externally fitting the sealing member and the sealing property of the seal portion formed by melting the molded article 8 for sealing.

As shown in FIG. 9, the results of the wearability were evaluated in three stages, ◯, Δ, and ×, and ◯ was considered good. According to this result, the gap dimension S between the glass tube 7 and the sealing molded body 8 is 0.05 mm or more, which is a necessary point for obtaining good mounting properties.
Incidentally, the details of the wearability experiment and the three-stage evaluation will be described in detail.
Several types of sealing molded bodies having different inner diameters: φ ₁ were prepared, and an experiment was conducted in which these were passed through (standing) glass tubes (individually measured outer diameter: G) placed in actual through holes.
After the experiment, the seal moldings and the glass tubes were closely observed and classified as follows in terms of wearability.
X: The molded product for sealing cannot be attached (the glass tube cannot pass).
Δ: Mounting of the sealing molded body is possible, but damage (such as chipping) due to mounting is observed on the sealing molded body or the glass tube.
○: A molded article for sealing can be attached, and no trauma is observed in each case.

As a result of the sealing performance, as shown in FIG. 10, a defective rate of the sealing effect was obtained, and a defective rate of 1.5% or less was determined to be good according to the result. According to this result, H / W ≧ 0.44
H / S ≧ 7.0
Satisfying this condition is a necessary point for obtaining a good sealing effect and reducing the defect rate.
Incidentally, the details of the sealability experiment and the determination of pass / fail will be described in detail.
[1] A sample in which a through-hole is formed in the center of a small-sized glass (about 100 mm square), a glass tube and a molding for sealing are installed on one side, and the sample is sintered under certain conditions (actual furnace and operating conditions). Create.
[2] The tip of the sample glass tube is melted (sealed), and the glass tube itself is kept in a state of ensuring airtightness.
[3] One side of the prepared sample is connected to a He leak detector (evacuated), and the other side is opened to the atmosphere.
[4] He gas is blown on the air-released side, and detection by the He leak detector is confirmed. If the detection is detected, it is determined that the seal molded body is not airtight.

From the above results, in order to ensure a good sealing performance of the outlet,
H / W ≧ 0.44
H / S ≧ 7.0
It is necessary to use a glass tube with a dimension that satisfies the above and a molded body for sealing.
Furthermore, in addition to the above two conditions, in order to require good wearability,
S ≧ 0.05mm
It is necessary to use a glass tube with a dimension that satisfies the above and a molded body for sealing.

[Another embodiment]
Other embodiments will be described below.

<1> The glass panel formed by the “glass panel discharge port forming technology” of the present invention can be used for a wide variety of applications, for example, for buildings and vehicles (window glass of automobiles, railway vehicles, etc.). It can be used for window glass, ship's window glass) and device elements (surface glass of display panels such as plasma displays, doors and walls of refrigerators, doors and walls of heat insulating devices), and the like.
<2> The plate glass is not limited to the plate glass having a thickness of 3 mm described in the previous embodiment, and may be a plate glass having another thickness. The type of glass can be arbitrarily selected. For example, template glass, ground glass (glass having a function of diffusing light by surface treatment), meshed glass or tempered glass, heat ray absorption, ultraviolet ray absorption, heat ray It may be a plate glass provided with a function such as reflection, or a combination thereof.
The glass composition may be soda silicate glass (soda lime silica glass), borosilicate glass, aluminosilicate glass, or various crystallized glasses.
<3> The plate glass is not limited to one in which one plate glass and the other plate glass have different lengths or width dimensions, but uses ones formed in the same dimensions. May be. And how to laminate | stack both plate glass may be piled up in the state which edge parts align. Moreover, you may comprise the glass panel combining the thing from which the thickness dimension of one plate glass and the other plate glass differs.
<4> The spacer is not limited to the stainless steel spacer described in the previous embodiment, and may be, for example, Inconel or other metals, quartz glass, ceramics, etc. In short, any material can be used as long as it can be supported so that the two glass plates do not contact each other under external force. Further, the shape is not limited to the cylindrical shape, and may be a prism shape or the like, and the interval between the spacers can be appropriately changed.
<5> The molded body 8 for sealing is not limited to the low melting point glass described in the previous embodiment, and may be, for example, metal solder or brazing material. It is called a molded product for sealing.

Partially cutaway perspective view showing glass panel Exploded perspective view showing the outlet Sectional view showing the main part of the glass panel Sectional drawing which shows the principal part of a glass panel Cross-sectional view of the main part showing the decompression status of the sealed void Cross-sectional view of the main part showing the discharge port of the glass panel Sectional drawing showing dimensions of glass tube and molded body for sealing The figure which shows the dimension list of the test body by an Example The figure which shows the result of the mounting | wearing property by an Example The figure which shows the result of the defect rate by an Example Cross-sectional view of the main part showing the state of conventional seal formation

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 A pair of plate glass 1A One plate glass 1a Through-hole peripheral part 3 Through-hole 6 Outlet 7 Discharge glass tube (henceforth only called a glass tube)
8 Molded body for sealing G Outer diameter φ ₁ Inner diameter φ ₂ Outer diameter H Thickness K Seal part S (φ ₁ -G) / 2 (Dimension of gap between sealing molded body and glass tube)
V Sealed gap W (φ ₂ -φ ₁ ) / 2 (Diameter thickness dimension of the molded article for sealing)

Claims (4)

In providing a discharge port for discharging the gas in the sealed gap between the two glass plates to the outside of any one of the pair of glass plates arranged at intervals in the thickness direction, the one glass plate A through hole is provided, and a discharge glass tube is erected in the through hole, and an annular sealing molded body is fitted on the base end portion of the glass tube, and the sealing molded body is heated and melted. And a glass panel discharge port forming method for forming a seal portion by flowing over and solidifying the base end portion of the glass tube and the peripheral edge portion of the one plate glass,
A method for forming a discharge port of a glass panel, wherein the seal part is set by setting the dimensions of the molded body for sealing and the glass tube for discharging as follows.
H / W ≧ 0.44
H / S ≧ 7.0
However,
H: Height of the molded body for sealing (mm)
W: (φ ₂ −φ ₁ ) / 2 (Diameter thickness dimension of the molded article for sealing) (mm)
S: (φ ₁ −G) / 2 (Dimension of gap between sealing molded body and glass tube) (mm)
φ ₁ : Inner diameter (diameter) dimension (mm) of seal molding
φ ₂ : Outer diameter (diameter) dimension (mm) of the molded article for sealing
G: Outer diameter (diameter) of glass tube (mm)   The method for forming a discharge opening for a glass panel according to claim 1, wherein a clearance dimension S between the molded body for sealing and the discharge glass tube is set to 0.05 mm or more. A discharge port forming member for use in the discharge port forming method for a glass panel according to claim 1 or 2,
A discharge port forming member comprising the sealing molded body and a discharge glass tube, the dimension of which is set as follows.
H / W ≧ 0.44
H / S ≧ 7.0
However,
H: Height of the molded body for sealing (mm)
W: (φ ₂ −φ ₁ ) / 2 (Diameter thickness dimension of the molded article for sealing) (mm)
S: (φ ₁ −G) / 2 (Dimension of gap between sealing molded body and glass tube) (mm)
φ ₁ : Inner diameter (diameter) dimension (mm) of seal molding
φ ₂ : Outer diameter (diameter) dimension (mm) of the molded article for sealing
G: Outer diameter (diameter) of glass tube (mm)   The discharge port forming member according to claim 3, wherein a gap dimension S between the sealing molded body and the discharge glass tube is set to 0.05 mm or more.

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