CN104291663A - Vacuumizing hole of vacuum glass and manufacturing method thereof - Google Patents
Vacuumizing hole of vacuum glass and manufacturing method thereof Download PDFInfo
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- CN104291663A CN104291663A CN201310298922.0A CN201310298922A CN104291663A CN 104291663 A CN104291663 A CN 104291663A CN 201310298922 A CN201310298922 A CN 201310298922A CN 104291663 A CN104291663 A CN 104291663A
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- glass
- bleeding point
- wear ring
- vacuum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
A vacuumizing hole of a vacuum glass is characterized in that the a manufacturing method includes following steps: punching an upper glass of the vacuum glass to form the vacuumizing hole; manufacturing a sealing ring around the vacuumizing hole on the lower surface of the upper glass and manufacturing the sealing ring at the position corresponding to the vacuumizing hole on the upper surface of the lower glass, wherein the sealing ring on the upper glass can be inserted into the sealing ring on the lower glass to form a vacuumizing channel between the two sealing rings; vacuumizing the vacuumizing hole and performing a heating process to enable a metal solder to melt into a liquid which is remained in the sealing ring on the lower glass, wherein the sealing ring on the upper glass is also sunk in the liquid; enabling the vacuumizing hole to seal automatically through a liquid sealing principle; decreasing the temperature to solidifying the liquid to achieve air-tightness sealing of the vacuumizing hole. The method can achieve mass production, can greatly improve production efficient and qualification ratio of a vacuum glass and can reduce production cost.
Description
Technical field
The invention belongs to vacuum glass field, particularly relate to bleeding point of a kind of vacuum glass and preparation method thereof.
Background technology
Existing vacuum glass is generally made up of two pieces or three blocks of sheet glass, glass surrounding low temperature glass solder edge sealing, and there is small upholder centre, makes the thin vacuum layer forming 0.1 ~ 0.2mm thickness between two blocks of glass by bleeding.Owing to not having the heat transfer of gas, transaudient, the internal surface of glass can have again transparent low heat-emissive film, so vacuum glass has well heat insulation and soundproof effect, is one of best energy-saving glass of performance.
The gordian technique of existing vacuum glass has: one is edge sealing, and two is laying of upholder, and three is acquisition and maintenances of vacuum.The mode that existing vacuum glass obtains vacuum mainly contains the following two kinds: (1) is that first on a sheet glass, bleeding point is prepared in punching, then while adding hot edge seal with low temperature glass solder, on bleeding point, Glass tubing of bleeding is welded, finally heating vacuumizes the Glass tubing and sealing by fusing is bled, owing to bleeding, Glass tubing protrudes from glass surface, so also need to protect bleeding point position; (2) be do not need prefabricated bleeding point above glass, but glass edge being scribbled low temperature glass solder is placed in vacuum furnace after closing sheet, adds hot edge seal under vacuo and directly forms vacuum layer.The shortcoming of first kind of way is that evacuation process is complicated, production efficiency is very low: because pump-line is very thin, vacuum layer is very thin, pumping resistance is large, speed is little, and needs monolithic to extract, so production efficiency is very low; The second way can solve the shortcoming that first kind of way exists, but because low temperature glass solder is made up of many oxide, under a vacuum at high temperature, in the gas that volatile substances in the air of solder wettable and moisture, solder, solder dissolve in process of production and solder, the decomposition etc. of partial oxide all can cause in solder and produce a large amount of bubbles, greatly weaken the properties especially resistance to air loss of solder, cause the feasibility of this kind of mode to be greatly affected.Also have a kind of mode to be between above two kinds of modes, i.e. prefabricated bleeding point on glass, then after high temperature edge sealing, vacuumize again, finally utilize solder by seal weldings such as sheet metals on bleeding point; The shortcoming of which is if adopt glass solder, runs into the difficulty identical with the second way, if adopt brazing metal soldering, how making small and light sheet metal realize resistance to air loss welding under vacuum will run into very large difficulty, and its economic benefit is not necessarily better than first kind of way.
Summary of the invention
Technical problem to be solved by this invention is the defect being to exist for existing vacuum glass pumping hole, a kind of novel vacuum glass pumping hole and preparation method thereof is provided, the making method technique of this vacuum glass pumping hole is simple, made vacuum glass comprises toughened vacuum glass and can overcome deficiency of the prior art, effectively can ensure the work-ing life of the resistance to air loss of vacuum glass and heat insulation performance, prolongation vacuum glass, and can improve vacuum glass production efficiency, reduce production cost.
In order to solve the problems of the technologies described above, the invention provides a kind of bleeding point of vacuum glass, it is characterized in that: on the upper glass of vacuum glass, bleeding point is made in punching, preparation one wear ring around the lower surface, bleeding point of upper glass, a wear ring is also prepared in the position corresponding with bleeding point at the upper surface of lower-glass, the wear ring of described upper glass can insert in the wear ring of described lower-glass, is bleed-off passage between two wear rings; After upper and lower glazing gasket, brazing metal is put into described bleeding point, being vacuumized by described bleeding point and heating makes described brazing metal be fused into liquid, described liquid retention is in the wear ring of described lower-glass, the wear ring of described upper glass is also submerged in described liquid, utilize hydraulic seal principle by described bleeding point self-sealing, after cooling, described liquid solidifies, and realizes the airtight sealing to described bleeding point.
Wherein, described wear ring can be the ring of arbitrary shape.
Further, described wear ring is the annulus concentric with described bleeding point.
Wherein, the wear ring of described lower-glass can be two, and the wear ring of described upper glass, between two wear rings of described lower-glass, is suitable for larger bleeding point.
Further, the little wear ring in two wear rings of described lower-glass can be thin slice, can be further the thin slice of intermediate projections, or a bocca is placed at described little wear ring place.
Wherein, the height of described wear ring is less than the height of vacuum layer.
Wherein, described wear ring diameter and highly preferably consider bleed-off passage and solder sealed vol and determine.
Wherein, described wear ring is preferably made up of glass or metal, preferably adopts toughened glass ink or metal paste to make when described upper lower-glass is toughened glass.
Wherein, described wear ring adopts the directly mode such as preparation or indirect welding to be produced on described upper lower-glass.
Further, when described wear ring adopts and directly prepares, glass paste, metal paste or the electric slurries etc. such as preferred employing cryogenic glass powder or glass ink utilize artificial or mechanical mode to be produced on described upper lower-glass, form through high temperature sintering, the mode that the mode of described machinery preferably sprays or prints, can one to spraying for several times or printing one to several slurries; When described wear ring adopts indirect welding process to prepare, preferably adopt the metal ring close with glass expansion coefficient or metal tube to be welded on described upper lower-glass, described welding process, preferably adopt glass solder or metal paste welding; Described material is existing commercial commodity.
Further, described metal paste (or electric slurry) contributes to welding between brazing metal with glass, and described metal paste can also serve as the transition layer between glass paste and brazing metal.
Further, make the fusing point of its fusing point of material higher than glazing gasket low temperature glass solder of described wear ring, ensure that, in glazing gasket process, described wear ring does not change.
Wherein, described brazing metal comprises low-temperature metal solder and solder, and described material is existing commercial commodity.
Further, the fusing point of fusing point lower than glass solder of described brazing metal or the use temperature of binding agent, during brazing metal fusing, the glass solder of edge sealing or binding agent remain unchanged.
Further, the shape of described brazing metal is powdery, strip, sheet or bulk, ring-type, tubulose etc.
Wherein, the height of described liquid is preferably close with the height of described lower-glass wear ring.
Wherein, described in vacuumize and bleeding point sealing, can in vacuum furnace batch carry out, also can monolithic implement; Overallly can heat glass, also can local heating bleeding point.
Wherein, described heating, can adopt conventional heating, Infrared Heating, also can adopt induction heating, LASER HEATING, can also adopt microwave heating and other suitable heating unit or heater means.
Further, described heating, can heat bulk glass, also can local heating bleeding point.
Wherein, described bleeding point after brazing metal sealing, then uses sealant sealing, and be trade mark or the metal decorative sheet of product above seal gum, seal gum can protect brazing metal, can realize two seals again to bleeding point.
Further, described seal gum preferably has secret sealing, more preferably hot melt adhesive, hot-setting adhesive or two component sealing gum.
In order to solve the problems of the technologies described above, the invention provides the making method of above-mentioned vacuum glass pumping hole, it comprises:
The first step, according to the size of required making bleeding point, on upper glass, boring makes bleeding point;
Second step, make the wear ring concentric with bleeding point at the lower surface of upper glass, the upper surface of lower-glass, the wear ring of upper glass can be enclosed within the wear ring of lower-glass;
3rd step, after upper and lower glazing gasket, loads brazing metal in bleeding point, and sends in vacuum furnace;
4th step, described heating under vacuum sole is vacuumized, limit heating, be evacuated to below 0.1Pa, be warming up to more than the temperature of fusion of brazing metal, brazing metal is fused into liquid, liquid retention is in the wear ring of lower-glass, the wear ring of upper glass also floods in a liquid, and liquid is by bleeding point self-sealing; Stop heating, with stove cooling, brazing metal solidifies and realizes airtight sealing to bleeding point afterwards, opens vacuum furnace, takes out vacuum glass;
5th step, puts into seal gum in bleeding point, Paste Product trade mark or metal decorative sheet on seal gum.
Wherein, described wear ring can be the ring of arbitrary shape.
Wherein, the wear ring of described lower-glass can be two, and the wear ring of described upper glass is between two wear rings of described lower-glass.
Further, the little wear ring in two wear rings of described lower-glass can be thin slice, can be further the thin slice of intermediate projections, or a bocca is placed at described little wear ring place.
Wherein, the height of described wear ring is less than the height of vacuum layer.
Wherein, described wear ring diameter and highly preferably consider bleed-off passage and solder sealed vol and determine.
Wherein, described wear ring is preferably made up of glass or metal, preferably adopts toughened glass ink or metal paste to make when described upper lower-glass is toughened glass.
Wherein, described wear ring adopts the directly mode such as preparation or indirect welding to be produced on described upper lower-glass.
Further, when described wear ring adopts and directly prepares, preferably adopt the glass paste such as cryogenic glass powder or glass ink, metal paste or electric slurry etc. to utilize artificial or mechanical mode to be produced on described upper lower-glass, form through high temperature sintering; The mode that the mode of described machinery preferably sprays or prints, can one to spraying for several times or printing one to several slurries; When described wear ring adopts indirect welding process to prepare, preferably adopt the metal ring close with glass expansion coefficient or metal tube to be welded on described upper lower-glass, described welding process, preferably adopt glass solder or metal paste welding; Described material is existing commercial commodity.
Further, described metal paste or electric slurry contribute to welding between brazing metal with glass, and described metal paste can also serve as the transition layer between glass paste and brazing metal.
Further, make the fusing point of its fusing point of material higher than glazing gasket low temperature glass solder of described wear ring, ensure that, in glazing gasket process, described wear ring does not change.
Wherein, described brazing metal comprises low-temperature metal solder and solder, and described material is existing commercial commodity.
Further, the fusing point of fusing point lower than glass solder of described brazing metal or the use temperature of binding agent, during brazing metal fusing, the glass solder of edge sealing or binding agent remain unchanged.
Further, the shape of described brazing metal is powdery, strip, sheet or bulk.
Wherein, the height of described liquid is preferably close with the height of described lower-glass wear ring.
Wherein, described in vacuumize and bleeding point sealing, can in vacuum furnace batch carry out, also can monolithic implement; Overallly can heat glass, also can local heating bleeding point.
Wherein, described heating, can adopt conventional heating, as Infrared Heating, also can adopt induction heating, LASER HEATING, can also adopt microwave heating and other suitable heating unit or heater means.
Further, described heating, can heat bulk glass, also can local heating bleeding point.
Wherein, described seal gum preferably has secret sealing, more preferably hot melt adhesive, hot-setting adhesive or two component sealing gum.
Beneficial effect of the present invention:
Vacuum glass pumping hole of the present invention, with reference to " water seal " structure of water exhaust system especially floor drain, according to hydraulic seal principle, is fused into the self-sealing of metal realization to bleeding point of liquid under utilizing high temperature, vacuum glass pumping hole structure of the present invention is simple, it is reliable, convenient for production, with low cost to seal, directly seal in a vacuum furnace, avoid the existing possibility of Glass tubing in melting moment air inlet of bleeding, and the exhaust temperature of glass can be improved, glass absorption and dissolved gases are thoroughly got rid of, can not there is chemical transformation in brazing metal under vacuum, solidify rear resistance to air loss good, effectively can ensure the vacuum tightness of vacuum glass vacuum layer, compared with the bleeding point of existing vacuum glass, its size of bleeding point of the present invention can be very large, its bleed-off passage sectional area is tens times of existing Glass tubing of bleeding to tens times, pumping resistance, inside and outside differential pressure is less, pumping speed, the vacuum tightness of vacuum layer is higher, thus be conducive to improving the heat insulation of vacuum glass, sound-proofing properties, extend its work-ing life, self-sealing in vacuum oven, can mass production, greatly can improve production efficiency and qualification rate, the reduction production cost of vacuum glass, the fusing point of brazing metal is easy to select, and can carry out entirety heating to toughened glass and ensure that toughened glass is unannealed, realize mass and make toughened vacuum glass.
Accompanying drawing explanation
Fig. 1 is the structural representation of vacuum glass pumping hole of the present invention;
Fig. 2 is the structural representation that lower-glass of the present invention has the vacuum glass pumping hole of two wear rings;
Fig. 3 is the structural representation that lower-glass of the present invention has the vacuum glass pumping hole of convex surface thin slice.
In figure: 1. go up glass, 2. lower-glass, 3. brazing metal, 4. go up the wear ring on glass, 5. the wear ring of lower-glass, the convex surface thin slice 6. on lower-glass, 7. seal gum, 8. trade mark or tinsel.
Embodiment
Below adopt embodiment and accompanying drawing to describe embodiments of the present invention in detail, to the present invention, how utilisation technology means solve technical problem whereby, and the implementation procedure reaching technique effect can fully understand and implement according to this.
Embodiment 1: see Fig. 1, vacuum glass is made up of upper glass 1 and lower-glass 2, upper glass 1 bores a through hole and forms bleeding point, the upper surface of the upper and lower glass of lower surface 2 of upper glass 1 utilize mechanical application or printing technology that glass paste or metal paste are printed to the wear ring concentric with bleeding point, the wear ring 4 of upper glass 1 can insert in the wear ring 5 of lower-glass 2, is bleed-off passage between two wear rings; Upper lower-glass is sent in High Temperature Furnaces Heating Apparatus or annealing furnace and wear ring is sintered on upper lower-glass, then the upper lower-glass of low temperature glass solder in constant-pressure and high-temperature stove after involution piece is utilized to carry out edge sealing, after glass after edge sealing takes out from High Temperature Furnaces Heating Apparatus, while hot brazing metal 3 such as tin alloy is put into bleeding point, send in vacuum furnace with by glass, once can send into multiple pieces of glass; Heating under vacuum sole is vacuumized, limit heating, be evacuated to below 0.1Pa, be warming up to the temperature of fusion of brazing metal 3 tin alloy as more than 300 DEG C, brazing metal 3 tin alloy is fused into liquid retention in the wear ring 5 of lower-glass 2, the wear ring 4 of upper glass 1 also floods in a liquid, and liquid is by bleeding point self-sealing; Stop heating, with stove cooling, brazing metal 3 tin alloy condenses into solid, realizes airtight sealing, open vacuum furnace to bleeding point, takes out vacuum glass.
Embodiment 2: see Fig. 2, vacuum glass is made up of upper glass 1 and lower-glass 2, upper glass 1 bores a through hole and forms bleeding point, the upper surface of the upper and lower glass of lower surface 2 of upper glass 1 utilizes glass paste or metal paste each bonding 1 and 2 metal rings or glass ring, adopt metal ring time, preferably close with thermal expansion coefficient of glass metal as kovar alloy, adopt glass ring time, preferred coated metal paste, with reinforced seal effect; The wear ring 4 of upper glass 1 can insert between two wear rings 5 of lower-glass 2, and the space between three wear rings is bleed-off passage; Upper lower-glass is sent in High Temperature Furnaces Heating Apparatus or annealing furnace and wear ring is sintered on upper lower-glass, then the upper lower-glass of low temperature glass solder in constant-pressure and high-temperature stove after involution piece is utilized to carry out edge sealing, after glass after edge sealing takes out from High Temperature Furnaces Heating Apparatus, while hot brazing metal 3 such as zinc alloy is put into bleeding point, circular tube shaped made by zinc alloy, be inserted between the wear ring 4 of glass 1 and the wear ring 5 of lower-glass 2, send in vacuum furnace with by glass, once can send into multiple pieces of glass; Heating under vacuum sole is vacuumized, limit heating, be evacuated to below 0.1Pa, be warming up to the temperature of fusion of brazing metal 3 zinc alloy as more than 380 DEG C, brazing metal 3 zinc alloy is fused into liquid retention between two wear rings 5 of lower-glass 2, the wear ring 4 of upper glass 1 also floods in a liquid, and liquid is by bleeding point self-sealing; Stop heating, with stove cooling, brazing metal 3 zinc alloy condenses into solid, realizes airtight sealing, open vacuum furnace to bleeding point, takes out vacuum glass.Seal gum 7 is put into while hot as butyl rubber, the product brand 8 of covering above of seal gum 7, the upper surface flush of trade mark 8 and upper glass 1 in bleeding point.
Embodiment 3: see Fig. 3, substantially the same manner as Example 2, difference is that the wear ring 4 of glass 1 changes metal tube into by metal ring, and the little wear ring 5 of lower-glass 2 changes convex surface thin slice 6 into, and the present embodiment is suitable for thicker vacuum layer and larger bleeding point.
All above-mentioned this intellecture properties of primary enforcement, not setting restriction this product innovation of other forms of enforcement and/or novel method.Those skilled in the art will utilize this important information, and foregoing is revised, to realize similar implementation status.But all modifications or transformation belong to the right of reservation based on product innovation of the present invention.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (10)
1. the bleeding point of a vacuum glass, it is characterized in that: on the upper glass of vacuum glass, bleeding point is made in punching, preparation one wear ring around the lower surface, bleeding point of upper glass, a wear ring is also prepared in the position corresponding with bleeding point at the upper surface of lower-glass, the wear ring of described upper glass can insert in the wear ring of described lower-glass, is bleed-off passage between two wear rings; After upper and lower glazing gasket, brazing metal is put into described bleeding point, being vacuumized by described bleeding point and heating makes described brazing metal be fused into liquid, described liquid retention is in the wear ring of described lower-glass, the wear ring of described upper glass is also submerged in described liquid, utilize hydraulic seal principle by described bleeding point self-sealing, after cooling, described liquid solidifies, and realizes the airtight sealing to described bleeding point.
2. the bleeding point of vacuum glass as claimed in claim 1, it is characterized in that: the wear ring of described lower-glass is two, the wear ring of described upper glass is between two wear rings of described lower-glass.
3. the bleeding point of vacuum glass as claimed in claim 2, is characterized in that: the little wear ring in two wear rings of described lower-glass is thin slice or the cone of intermediate projections.
4. the bleeding point of vacuum glass as claimed in claim 1, it is characterized in that: described wear ring is made up of glass or metal, when described upper lower-glass is toughened glass, described wear ring preferably adopts toughened glass ink or metal paste to make.
5. the bleeding point of vacuum glass as claimed in claim 1, is characterized in that: described wear ring adopts the mode of directly preparation or welding to be indirectly produced on described upper lower-glass.
6. the bleeding point of vacuum glass as claimed in claim 5, is characterized in that: when described wear ring is directly prepared, adopt glass paste or metal paste one to spraying for several times or printing one to several slurries to described upper lower-glass on, form through high temperature sintering; When described wear ring welds preparation indirectly, the metal ring close with glass expansion coefficient or metal tube or Glass tubing is adopted to utilize glass solder or metal paste to be welded on described upper lower-glass.
7. the bleeding point of vacuum glass as claimed in claim 1, is characterized in that: described brazing metal comprises low-temperature metal solder and solder.
8. the bleeding point of vacuum glass as claimed in claim 1, is characterized in that: described in vacuumize with bleeding point sealing be utilize process furnace entirety heating glass or local heating bleeding point, batch carries out or monolithic is implemented.
9. the bleeding point of vacuum glass as claimed in claim 1, is characterized in that: described bleeding point after brazing metal sealing, then uses sealant sealing, is trade mark or the metal decorative sheet of product above seal gum.
10. the making method of the vacuum glass pumping hole described in any one of claim 1 to 9, is characterized in that, comprising:
The first step, according to the size of required making bleeding point, on upper glass, boring makes bleeding point;
Second step, make the wear ring concentric with bleeding point at the lower surface of upper glass, the upper surface of lower-glass, the wear ring of upper glass can be enclosed within the wear ring of lower-glass;
3rd step, after upper and lower glazing gasket, loads brazing metal in bleeding point, and sends in vacuum furnace;
4th step, described heating under vacuum sole is vacuumized, limit heating, be evacuated to below 0.1Pa, be warming up to more than the temperature of fusion of brazing metal, brazing metal is fused into liquid, liquid retention is in the wear ring of lower-glass, the wear ring of upper glass also floods in a liquid, and liquid is by bleeding point self-sealing; Stop heating, with stove cooling, brazing metal solidifies and realizes airtight sealing to bleeding point afterwards, opens vacuum furnace, takes out vacuum glass;
5th step, puts into seal gum in bleeding point, Paste Product trade mark or metal decorative sheet on seal gum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310298922.0A CN104291663A (en) | 2013-07-17 | 2013-07-17 | Vacuumizing hole of vacuum glass and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310298922.0A CN104291663A (en) | 2013-07-17 | 2013-07-17 | Vacuumizing hole of vacuum glass and manufacturing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN104291663A true CN104291663A (en) | 2015-01-21 |
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ID=52311656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310298922.0A Withdrawn CN104291663A (en) | 2013-07-17 | 2013-07-17 | Vacuumizing hole of vacuum glass and manufacturing method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN104291663A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020141490A3 (en) * | 2019-01-04 | 2020-08-20 | Guardian Glass, LLC | Internal tube for vacuum insulated glass (vig) unit evacuation and hermetic sealing, vig unit including internal tube, and associated methods |
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| JP2002137940A (en) * | 2000-10-31 | 2002-05-14 | Nippon Sheet Glass Co Ltd | Method of fabricating glass panel and glass panel |
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| JP2003192399A (en) * | 2001-12-25 | 2003-07-09 | Nippon Sheet Glass Co Ltd | Cover for glass panel suction hole and method of using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020141490A3 (en) * | 2019-01-04 | 2020-08-20 | Guardian Glass, LLC | Internal tube for vacuum insulated glass (vig) unit evacuation and hermetic sealing, vig unit including internal tube, and associated methods |
| CN113260766A (en) * | 2019-01-04 | 2021-08-13 | 佳殿玻璃有限公司 | Inner tube for Vacuum Insulating Glass (VIG) unit evacuation and hermetic sealing, VIG unit including the inner tube, and associated methods |
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