JPH11130454A - Tempered glass plate having protective cover on peripheral part thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such inconveniences that a band for the protective covering of a peripheral part of the tempered glass plate is liable to be peeled off and also, looseness and wrinkles are liable to be caused in the band and further, the band is liable to fall off from the tempered glass. SOLUTION: Relating to a tempered glass plate which is formed 1 by subjecting the edges of a glass material plate to beveling and polishing treatment and thereafter subjecting all the faces of the plate to thermal tempering, a metallic covering band 2 is stuck to the formed tempered glass plate 1 so as to cover the edges of the glass plate 1 and peripheral parts of the both surfaces of the glass plate 1, wherein non-covering part 3, i.e., cut-off parts 3, are formed in the stuck covering band 2 in appropriate positions of at least the opposite longer sides of the glass plate 1, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tempered glass plate which is mounted on a frame of a door of a building, a structure, a transportation device, etc., at the time of storage, transportation or installation on the frame. The present invention relates to a tempered glass plate having a protective coating on a peripheral portion in which generation of a scratch on the peripheral portion is suppressed.

[0002]

2. Description of the Related Art In Japanese Utility Model Laid-Open Publication No. 3-101793, a protective tape (including a metal such as aluminum and a resin such as polyester and polypropylene) is applied to cover the entire periphery of the double-glazed glass. It is disclosed to wear.

Japanese Patent Application Laid-Open No. 61-14384 discloses a glass fitting edge such as a sash, a sheet glass (tempered glass or the like), an organic / inorganic sealing member or an intermediate strip for sealing the sheet glass, and a glass. Disclosed is a fire protection glass insertion structure having a pressure system between the insertion edge and the glass sheet that expands (expands) in a fire and presses against the glass sheet surface.

[0004] In these known examples, in particular, when a coated band having a large coefficient of thermal expansion such as a metal tape is coated on a glass sheet, the adhesion between the coated band and the glass may be caused by repeated temperature fluctuations and temperature differences in the four seasons. Is weakened, the coated band is peeled off, the coated band is loosened and wrinkled, and the coated band is dropped off.

Japanese Patent Application Laid-Open No. 9-100131 discloses that a member (metal, resin tape containing fibers, channel member, etc.) for preventing the glass sheet from expanding and scattering when the thermally strengthened glass sheet is broken is provided over the entire circumference. It is disclosed.

In the above-mentioned known example, when a coated glass having a high coefficient of thermal expansion such as a metal tape is coated on a sheet glass, the adhesion between the coated web and the glass is weakened due to the temperature fluctuation and the temperature difference as described above. As a result, the coated band is peeled off, the coated band is loosened, and wrinkles are formed, and the function as the expansion preventing member is lost.

The present invention is to provide a tempered glass sheet having a protective coating on the peripheral portion, which is suitable for solving the above-mentioned problems.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a tempered glass sheet obtained by chamfering the edge of a raw glass plate, polishing the surface, and thermally strengthening the entire surface of the glass plate. It is a tempered glass plate in which a metal-coated band is closely adhered and a peripheral portion having an uncovered portion of the coated band at least at an appropriate position on a long side facing the side is protectively coated.

[0009] In the above, it is preferable that the uncovered portion of the coated band is disposed near the center of the opposite long side of the tempered glass plate, or more preferably, near the center of the four sides. In addition, it is desirable to further cover corner protection parts at the four corners of the tempered glass plate.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a tempered glass sheet whose long side of the glass exceeds 1000 mm.

FIG. 1 (perspective view) and FIG. 2 (front view)
The present invention will be described with reference to FIG. The glass base plate in the present invention is, for example, a borosilicate glass or a lithium silicate glass having a low thermal expansion coefficient and a high softening point, or an alumino-lime silicate glass or an alkali magnesium lime silicate glass having a relatively high thermal expansion coefficient. A clear transparent glass plate such as (a typical example is a soda-lime glass) and a colored transparent glass plate can be employed.

The thickness of the glass plate is not specified,
They range from about 5 mm to about a dozen mm. The size of the glass plate ranges from one thousand to several thousand mm on the long side, and from several hundred mm to over one thousand mm on the short side (sometimes the same length as the long side).

In these glasses, a glass base plate is heated to a temperature not lower than the strain point and not higher than the softening point, and then quenched by air blasting or other rapid cooling means to form a strengthened glass plate. The heat strengthening treatment means is not specified, and for example, there is a means for thermally strengthening while holding the glass plate in a vertical state, a means for arranging the glass plate in a horizontal state, and the like. When producing such a high-strength glass sheet, a so-called horizontal strengthening means such as a gas hearth or a roller hearth is preferably used.

Prior to the heat strengthening, the edge of the glass plate is chamfered and further polished so as not to cause minute chips or cracks. When the chamfered portion is polished, the edge surface and the yarn surface are uniformly polished, and the maximum roughness of the edge surface and the yarn surface is 20 μm or less, preferably 10 μm or less, more preferably 5 μm or less. That is, if there are locally conspicuous irregularities on the edge surface or the yarn surface, there is a possibility that a thermal crack originating from the portion may be caused, and the above-mentioned processing is to suppress the thermal crack as much as possible.

In the present invention, the glass plate (1 in the figure) which has been chamfered and polished as described above and further thermally strengthened, is connected to peripheral equipment articles during storage, transportation, installation and the like. At the time of contact, if there is a flaw or the like at the edge, there is a risk that thermal cracks will occur starting from this part,
The edge is protected and covered with the covering band 2.

The covering strip 2 is a metal strip that is plastic and adheres well to the edge of the glass plate 1 and that is not easily burned even when exposed to a flame and subjected to high heat. Thin ribbon,
A metal thin strip having a large number of holes, a band formed by braiding a metal wire, or a covering strip including these, for example, a sheet obtained by laminating a glass fiber cloth on the metal strip is preferable. Glass plate 1
In order to make the covering band 2 adhere to the covering band 2 so that the covering band 2 does not peel off or fall off, it is necessary to interpose an adhesive. Examples of the adhesive include silicone resin, phenol resin, and melamine. Organic adhesives such as resin, polyester resin, epoxy resin and urethane resin, and inorganic adhesives such as alkali silicate and aluminum phosphate can be used.

However, even when the cover strip 2 is brought into close contact with the cover, the difference in thermal expansion between the glass plate 1 and the cover strip 2 is large. Considering the temperature difference, for example, in the inland part where the temperature difference is large, the temperature received through the sash at the time of high temperature in summer reaches 50 ° C or more, and becomes -20 ° C or less under the same condition at low temperature in winter. And therefore the annual temperature difference is 70
The temperature exceeds 30 ° C., reaches 30 to 40 ° C. even in a day, and expands and contracts repeatedly.

As for the coefficient of thermal expansion, a typical soda-lime glass is at most 9.5 × 10 ⁻⁶ / ° C.
, And the rich in the other example plastic, 35-36 × 10 ^{over 6} / ° C. in zinc is easily metal in close contact with the glass plate, a 29 × 10 ^{over 6} / ° C. in lead. Table 1 shows the difference in expansion and contraction between the glass side and the metal-coated band (metal tape).

[Table 1]  Glass side length Temperature difference Glass side elongation Zinc tape Lead tape Elongation Expansion / shrinkage difference Elongation Expansion / shrinkage difference (mm) (° C) (mm) (mm) (mm) (mm) (mm)  500 70 0.33 1.19 0.86 1.05 0.68 1000 〃 0.67 2.38 1.72 2.03 1.37 1500 〃 1.00 3.57 2.57 3.05 2.05 2000 〃 1.33 4.76 3.43 4.06 2.73 2500 〃 1.66 5.95 4.29 5.08 3.41 3000 〃 2.00 7.14 5.14 6.09 4.10  

Although it cannot be said unconditionally, the glass side is 1 m (10 m).
(00mm), the difference between the expansion and contraction of the metal tape and the glass side is 1.4 to 1.7mm. If the expansion and contraction due to heat are repeated, the tape may be partially peeled off, wrinkled, and detached. There is. Therefore, it is essential to have the metal tape, that is, the uncovered portion (interrupted portion of the covered band) 3 of the covered band 2, at least in the vicinity of the end of the opposed long side or near the center of the glass plate. Things. It is sufficient that the length of the uncoated portion 3 is several mm to several tens mm.

In the above description, not only the tempered glass sheet but also the glass sheet is liable to come into contact with other equipment articles at the four corners or in the vicinity thereof in the course of transfer, storage, construction, etc., and it is easy for scratches or the like to occur in the area. It is preferable to avoid disposing the uncoated portion 3 of the coated strip 2 in this area, and to dispose the uncoated portion 3 near the center of the long side of the glass plate where the chance of contact with other equipment articles is relatively small. .

Further, when both the length and the shorter side of the glass plate exceed 1 m, it is desirable to dispose the non-covered portion 3 of the cover band 2 near the center of the four sides. In addition, in addition to the covering band 2, resin (for example, silicone resin), rubber (for example, neoprene rubber), or the above-mentioned material is provided at the four corners of the glass plate, which are easily contacted with other equipment articles and are easily damaged. It is preferable to provide a similar protective cap 4 made of metal or the like. The protective cap 4 may be removed at the time of installation work, or if it is cut as shown by 5 (indicated by a dashed line) in the figure, it will not be exposed from the sash and will be laid without being removed at the time of installation. It can be installed and installed as it is.

[0023]

The present invention will be described below with reference to specific examples. [Comparative Example 1] A soda-lime colorless transparent glass plate made by the float method and having a size of 1600 mm x 800 mm x 6 mm (thickness) was prepared, and its periphery was chamfered by a double edger to obtain a thread surface (oblique section). -Polished over the edge face (end face). This glass sheet was heated in a horizontal tempering furnace and then air blasted to obtain a tempered glass sheet.

The edge of the glass plate from the peripheral edge to the edge of the glass plate has a width of 20 mm over the entire circumference.
A zinc tape having a thickness of 0.13 mm and a thickness of 0.13 mm was coated. The tape was adhered to the edge of the glass plate with an acrylic adhesive.

Comparative Example 2 Size 2400 mm × 1200 mm × 6 mm
(Thickness) A soda-lime colorless transparent glass plate prepared by the float method was prepared, chamfered, polished and heat strengthened in the same manner as in Comparative Example 1 to obtain a strengthened glass plate.
The same zinc tape was used to cover the entire periphery of the edge of the glass plate, and the tape and the glass plate were bonded with an acrylic adhesive.

Example 1 The same glass plate as in Comparative Example 1 was used.
In the same manner as in Comparative Example 1, chamfering, polishing, and heat strengthening were performed to obtain a reinforced glass sheet. Using a zinc tape similar to that in Comparative Example 1, as shown in FIG. A 20 mm long uncoated portion (interrupted portion) was provided, and the tape and the glass plate were bonded with an acrylic adhesive.

Example 2 The same glass plate as in Comparative Example 2 was used.
In the same manner as in Comparative Example 2, chamfering, polishing, and heat strengthening were performed to obtain a reinforced glass sheet. Using a zinc tape similar to that in Comparative Example 2, as shown in FIG. An uncoated portion (interruption portion) having a length of 20 mm was provided near the center of the opposite end side, and the tape and the glass plate were bonded with an acrylic adhesive. Further, the four corners of the glass plate were covered with a protective cap made of preformed neoprene rubber as shown in the figure.

[Durability test] Each of the above samples was set in a thermostat, and one cycle was from -20 ° C to 50 ° C (one cycle time was
10 hours), a temperature rise / fall test was performed for 20 cycles. After the test, each sample was taken out and the adhesion of the tape was observed and investigated.

[Results] The sample of Comparative Example 1 had wrinkles due to partial peeling of the zinc tape on both long sides and the sample of Comparative Example 2 on four sides. The samples of Example 1 and Example 2
In each case, wrinkles and peeling of the zinc tape were not observed.

The protective cap covering portion of Example 2 did not swell, etc., and was difficult to be easily removed.

[0031]

According to the present invention, problems such as peeling of the metal-coated band, loosening and wrinkling of the coated band, and falling off of the coated band can be solved.

[Brief description of the drawings]

FIG. 1 is a perspective view according to one embodiment of the present invention;

FIG. 2 is a front view according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tempered glass plate 2 Coated strip 3 Non-coated part (interruption part) 4 Protective cap

Claims (4)

[Claims] 1. A tempered glass sheet obtained by chamfering an edge of a glass base plate, polishing the entire surface of the plate, and thermally strengthening the entire surface of the glass plate. A tempered glass sheet having a protective coating on a peripheral portion thereof, wherein the tempered glass sheet has a non-coated portion of the coated band body at least at an appropriate position on the opposite long side. 2. The uncoated portion of the coated strip is provided near the center of the opposite long side of the tempered glass sheet.
A tempered glass plate whose peripheral portion is protectively covered. 3. The tempered glass sheet according to claim 1, wherein the uncoated portion of the coated strip is provided near the center of the four sides of the tempered glass sheet. 4. The tempered glass plate is further provided with a corner protection cap at four corners of the tempered glass plate.
4. A tempered glass sheet having a protective coating on the periphery according to 2 or 3.