JP2014161437A - Multipurpose reinforced glass tableware - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide multipurpose reinforced glass tableware which has high rigidity and heat resistance, and can suppress the scattering of glass pieces at breakage, in the tableware formed with a compression stress layer on a surface of glass which is formed of soda lime glass.SOLUTION: Multipurpose reinforced glass tableware 10 comprises: a tableware main body 20 which has a surface layer formed with a compression stress layer in a range that a compression stress value which is cooled and reinforced by applying cooling air to a surface of glass formed of soda lime glass is 24 to 64 MPa, is molded so that a mouth part 21 side becomes large and a bottom part 23 side becomes small, and formed into such a shape that the same shape glass can be multiply laminated; a flange part 30 formed at an external periphery of the mouth part 21 of the tableware main body 20; a plurality of protection ribs 40 formed at an external periphery of a lower flank part 23A of the tableware main body 20; and at least three holding protrusions 50 formed outside the bottom part 23 of the tableware main body 20.

Description

  The present invention relates to a multi-purpose tempered glass tableware, in particular, it is excellent in strength, safety and security, can be used as a tableware as well as a storage container, has high transparency, can be used in a microwave oven, and is inexpensive. It relates to tempered glass tableware.

  Glass containers such as cups, bowls and dishes, or glass bottles such as beverage bottles are usually composed of a glass composition called soda lime glass. While this soda lime glass container has the advantage of being highly transparent and economical, the heat resistance (temperature difference) is at most 50 to 60 ° C., and immediately after the high temperature contents are placed in the glass container. There was a risk of breakage due to thermal shock when it was rapidly cooled by contact with water.

  Therefore, conventionally, as a tempered glass, a compressive stress layer has been formed on the glass surface by a chemical tempering method by ion exchange or an air cooling tempering method by cooling air to improve the heat resistance strength.

  In the chemical strengthening method, the glass surface containing sodium ions is brought into contact with molten potassium salt, so that the sodium ions in the glass surface layer are exchanged with potassium ions having a larger ionic diameter, thereby compressing the glass surface layer. A stress layer is formed and strengthened.

  In the air-cooling strengthening method, as is well known, the glass surface is strengthened by rapidly cooling the glass surface in the temperature range of 600 to 700 ° C. with cooling air to form a compressive stress layer on the glass surface. In this air-cooling strengthening method, unless a compressive stress layer is uniformly formed on the glass surface, the glass container does not have a uniform strength and becomes brittle. For this reason, in order to uniformly form a compressive stress layer on the surface of the glass container with cooling air, a preferred shape range of the glass container has been proposed (see Patent Document 1).

  Conventional tempered glass generally has a compressive stress layer of 80 MPa or more formed on the glass surface, but such a large stress layer inevitably causes variations in stress values and is extremely high locally. A portion having a stress value is formed and a large surface distortion is generated. When the material is broken, it may burst with a loud sound and the glass piece may be dissipated. For general consumers, such bursting during use is a major source of concern.

  On the other hand, what consists of borosilicate glass (Borosilicate glass) is known as heat resistant glass. Borosilicate glass has a low coefficient of thermal expansion and is about one-third that of normal glass. Thermal stress due to temperature difference is reduced and it is resistant to thermal shock. However, this heat-resistant glass is inferior in transparency to general soda lime glass, and is not as strong and durable as tempered glass. Moreover, heat resistant glass is more expensive than anything.

  Glass products that are generally used at home everyday are preferably safe and secure so that there is no fear of rupturing loudly or dissipating the glass pieces even in the event of breakage. Of course, durability is desired because of its moderate strength in daily life. Furthermore, it is also preferable that it can be used as a glass tableware or a glass container. Of course, it is a natural request to be inexpensive.

Japanese Patent Laid-Open No. 3-285836

  The present invention has been made in view of the above points, and is a tempered glass made of soda lime glass that is inexpensive and excellent in transparency, and has an appropriate compressive stress layer with little distortion on the glass surface. The purpose is to provide a multi-purpose glass tableware that can be used as a glass tableware or as a glass container. To do.

  That is, the invention of claim 1 has a surface layer in which a cooling air is applied to a glass surface made of soda lime glass for cooling and a compression stress layer having a compression stress value in the range of 24 to 64 MPa is formed. The table body is shaped so that the part side is large and the bottom part side is small, and the same shape can be stacked in multiple layers, the bowl formed on the outer periphery of the mouth of the tableware body, and the tableware body The present invention relates to a multipurpose tempered glass tableware having a plurality of protective ribs formed on the outer periphery of a lower body part and at least three holding projections formed on the outside of the bottom of the tableware body.

  The invention according to claim 2 relates to the multipurpose tempered glass tableware according to claim 1, wherein the tableware body has an inverted truncated pyramid shape or an inverted truncated cone shape.

  Invention of Claim 3 concerns on the multipurpose tempered glass tableware of Claim 1 or 2 which has a cover body provided with the fitting part fitted to the collar part formed in the outer periphery of the opening part of the said tableware main body.

  According to a fourth aspect of the present invention, the width of the protective rib formed on the outer periphery of the lower body portion of the tableware body is 1.5 to 2.0 mm and the height is 0.3 to 0.7 mm. 3. The multipurpose tempered glass tableware according to any one of 3 above.

  The invention according to claim 5 is the multipurpose tempered glass tableware according to any one of claims 1 to 4, wherein the holding projection formed on the outside of the bottom of the tableware body has a height of 0.5 to 1.0 mm. Concerning.

  Furthermore, the invention of claim 6 relates to the multipurpose tempered glass tableware according to claim 5, wherein the holding projections formed on the outside of the bottom of the tableware body are formed in four arcs.

According to the multipurpose tempered glass according to the first aspect of the present invention, the surface layer on which a compressive stress layer having a compressive stress value in the range of 24 to 64 MPa is formed by applying cooling air to the glass surface made of soda lime glass and cooling and strengthening the surface layer. A table body formed into a shape that can be stacked in multiple layers of the same shape, and a bowl portion formed on the outer periphery of the mouth of the table body, A glass surface made of soda lime glass having a plurality of protective ribs formed on the outer periphery of the lower body portion of the tableware main body and at least three holding projections formed on the bottom outer side of the tableware main body, and air cooling strengthening by, a tableware compressive stress value of the glass surface to form a compressive stress layer of 24.25~63.74MPa (250~650kg / cm ^2), square in plan view or circular inverse pyramid Or a tableware body having an inverted truncated cone shape, a bowl formed on the outer periphery of the mouth of the tableware body, a plurality of outer peripheral protrusions formed on the outer periphery near the bottom of the tableware body, and the tableware body Since it has at least three bottom surface protrusions formed on the outside of the bottom, it is made of soda lime glass that is inexpensive and excellent in transparency, and is a tempered glass in which an appropriate compressive stress layer with less distortion is formed on the glass surface. Supplied with a multipurpose glass tableware that can be used as a glass tableware or as a glass container. Was able to.

  Further, according to the invention of claim 2, since the tableware main body has an inverted truncated pyramid shape or an inverted truncated cone shape in claim 1, stacking and stocking can be performed effectively and efficiently.

  Since invention of Claim 3 has a cover body provided with the fitting part fitted in the collar part formed in the outer periphery of the opening | mouth part of the said tableware main body in Claim 1 or 2, a cover body is attached to tableware. There is an advantage that it can be used as a container with a lid as well.

  A fourth aspect of the present invention provides the invention according to any one of the first to third aspects, wherein the width of the protective rib formed on the outer periphery of the lower body portion of the tableware body is 1.5 to 2.0 mm and the height is 0.3. Since it is ˜0.7 mm, it is possible to prevent troubles such that water does not enter and separate from the joining surface without damaging the side surfaces of each other during stacking.

  In addition, the invention of claim 5 is any one of claims 1 to 4, wherein the holding projection formed on the outside of the bottom of the tableware body has a height of 0.5 to 1.0 mm. In addition to protecting the bottom surface in the case, during stacking, it is possible to prevent troubles such that the bottom surfaces of each other are not damaged and water cannot enter and separate from the joining surface.

  Further, the invention of claim 6 has the advantage that the bottom can be used stably since the holding projections formed on the outside of the bottom of the tableware main body are formed in four arcs in the fifth aspect. .

It is a perspective view of the multipurpose tempered glass tableware concerning one example of this invention. It is a side view of the multipurpose tempered glass tableware of FIG. It is sectional drawing which attached the cover body to the multipurpose tempered glass tableware of FIG. It is a principal part enlarged view of FIG. It is a perspective view showing another Example of this invention. It is a perspective view of the falling body used in experiment. It is a perspective view which shows an experimental state.

  The multipurpose tempered glass of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a multipurpose tempered glass tableware 10 according to one embodiment of the present invention. In the figure, reference numeral 20 denotes a tableware main body, 21 denotes a mouth portion, 22 denotes a trunk portion, and 23 denotes a bottom portion.

  As shown in the figure, this glass tableware 10 is a tableware in which a compressive stress layer is formed which is cooled and strengthened by applying cooling air to a glass surface made of soda lime glass. Since it is made of soda lime glass, it is relatively inexpensive and highly transparent, and can be preferably used as a daily tableware.

  The multipurpose tempered glass tableware 10 of the present invention has a glass surface layer on which a compressive stress layer having a compressive stress value in a range of 24 to 64 MPa is formed. That is, as described above, the stress value of the compressive stress layer increases the strength of the glass itself in proportion to the value, but in a normal tempered glass, a stress layer of 64 MPa or more is formed. When this high stress layer is formed, it is inevitable that the stress value varies. Therefore, a portion having a locally high stress value is formed, which causes surface distortion, and a glass piece with a loud sound at the time of breakage. May dissipate, giving consumers anxiety. On the other hand, when the stress value of the compressive stress layer on the glass surface is less than 24 MPa, desired strength and heat-resistant strength (temperature difference of 120 ° C. or more) cannot be obtained.

  For this reason, it is desirable that the compressive stress layer formed on the surface of the glass tableware has a stress value in the range of 24 to 64 MPa. As will be described later, the compressive stress layer having such a stress value is realized by gently strengthening with cooling air after glass tableware molding. Within this range, an appropriate compressive stress layer with little distortion can be formed on the glass surface, and it has strength and heat resistance strength as a glass tableware or container for everyday use, and is large in case of breakage. It can be made safe and secure without worrying about breaking with sound or dissipating glass pieces.

  In addition, the multipurpose tempered glass tableware 10 of the present invention has a tableware body 20 that is shaped so that the mouth portion 21 side is large and the bottom portion 23 side is small, and the same shape can be stacked in layers. That is, as shown in the tableware 10 shown in FIG. 1, the inverted pyramid-shaped tableware body 20 having a square shape in plan view, and the inverted truncated cone shape in a plan view circular shape like the tableware 10B shown in FIG. A shaped tableware body 20B is illustrated. By setting it as such a shape, stacking and stocking of tableware can be performed effectively and efficiently. In addition, in the tableware 10B of FIG. 5, the same code | symbol as the tableware 10 of FIG. 1 shows the same component.

  As well understood from FIGS. 2 to 4, a flange 30 is formed on the outer periphery of the mouth 21 of the tableware body 20 of the multipurpose tempered glass tableware 10 of the present invention. The flange portion 30 increases the thickness of the mouth portion 21 itself and protects it from light impacts. If necessary, as shown in FIGS. 3 and 4, the protrusion portion 33 (FIG. 4) of the flange portion 30. It can be used as a lidded container 10 </ b> A by covering the lid 60 with the fitting part 63 fitted to the lid.

  A lid 60 shown in FIG. 3 includes a fitting body 62 made of an elastic material such as silicone resin or rubber having a fitting portion 63 on the outer periphery of a lid main body 61 made of plastic. The lid body 61 may be made of glass, wood, earthenware, or the like, or may be provided with a known buckle type sealing device (device) for a storage container. In addition, as shown in FIG. 4, the usability of the mouth portion 21 of the tableware main body 20 is improved by inclining the collar portion 30 from the upper surface toward the lower surface and forming the tip of the collar portion 30 in a tapered shape. Attachment of the lid 60 is facilitated.

  A plurality of protective ribs 40 are formed on the outer periphery of the lower body 24 which is the lower half of the body 22 of the tableware body 20 of the multipurpose tempered glass tableware 10 of the present invention. In the illustrated embodiment, three belt-like protective ribs 40 are formed that circulate outwardly from the body 22 of the tableware body 20. The protective rib 40 increases the strength of the lower half of the body portion 22 of the tableware body 20, and prevents the side surfaces from being scratched by friction during stacking and joining. Troubles such as incompatibility cannot be prevented. The protective rib 40 preferably has a rib width of 1.5 to 2.0 mm (1.8 mm in the embodiment) and a height of 0.3 to 0.7 mm (0.5 mm in the embodiment) for the above purpose. .

  The multipurpose tempered glass tableware 10 of the present invention has at least three holding projections 50 outside the bottom 23 of the tableware body 20. The holding projection 50 stabilizes the bottom 23 of the tableware main body 20 and protects the bottom 23 from an impact or the like. Further, it is possible to prevent troubles such that water does not enter and separate from the joining surface without damaging the surfaces of the bottom portions 23 at the time of stacking and joining. For this purpose, it is desirable that the holding protrusions 50 have a protrusion height of 0.5 to 1.0 mm (0.7 mm in the embodiment) and are formed in four arcs as in the embodiment. .

  The holding protrusion 50 creates a gap on the outside of the bottom 23 of the tableware body 20, so that when the glass tableware 10 is put into a microwave oven for cooking, etc., between the bottom 23 and the microwave placement surface. Air can no longer be trapped, allowing escape of the expanded air and effective cooking.

Next, an embodiment of air cooling strengthening by cooling air of the multipurpose glass tableware 10 of the present invention will be described. The glass tableware of an Example is a small bowl made of soda-lime glass glass having the following composition. The unit is weight percent.
SiO ₂ : 72.5
CaO: 11.5
Na ₂ O: 13.0
Al ₂ O ₃ : 1.5
K ₂ O: 1.0
MgO: 0.5
The shape of the small bowl of the example is an inverted truncated pyramid shape having a rounded square shape in plan view with a mouth portion of 178 mm, a bottom portion of 127 mm, and a body height of 60.7 mm. By the way, the thickness of the bottom is 5.5 mm. After forming the glass tableware above, the air cooling strengthening process after the preheating and temperature control process is performed gently. In the examples, the thermal conductivity was reduced by about 1/5 of the cooling rate by the normal air-cooling strengthening method at a rate of 4.2 J / sec · m ² · ° C. (0.001 cal / sec · m ² · ° C.), A glass tableware having a compressive stress layer having a stress value in the range of 35 to 45 MPa was obtained.

  In this glass tableware, a compressive stress layer is formed on the glass surface by the air cooling strengthening method, and the compressive stress layer improves the breaking stress due to the tensile stress. At the same time, thermal fatigue is greatly prevented by the presence of the compressive stress layer, so that the strength against thermal shock due to the temperature difference during rapid cooling is increased, and the heat resistance strength is improved. Thereby, a crack does not arise even at the time of heating at the time of a high frequency microwave oven, or rapid cooling at the time of putting in a refrigerator.

Experimental example

Destructive experiments with the following products were conducted.
(1) Invention product (Example)
Glass tableware provided with a compressive stress layer having a stress value in the range of 35 to 45 MPa according to the above embodiment (2) Conventional tempered glass product (comparative 1)
Glass tableware provided with a compressive stress layer having the same shape as the example and having a stress value of 70 MPa or more by the conventional air-cooling strengthening method (3) Non-tempered glass product (Comparison 2)
Glass tableware having the same shape as that of the embodiment and not tempered. The falling object F having a weight of 45 g shown in FIG. A collision experiment was conducted. As shown in FIG. 6, the fallen body was dropped vertically in a pipe P from a height of 4 m and was damaged by colliding with glass tableware, and the dissipation radius of the glass piece at the time of breakage was compared with the size of the glass piece.

  In the product of the present invention of Example, the falling object F collided and the glass piece was greatly broken and dissipated within a radius of about 25 cm. On the other hand, in the conventional reinforced product having a proportionality of 1, the glass piece was broken into small pieces, but was scattered in a radius of about 100 cm. The non-strengthened product of contrast 1 had a large glass piece only with the bottom part collapsed, and there was almost no dissipation of the glass piece.

  From the above experimental results, the non-strengthened product of proportional 2 does not scatter glass pieces when broken, and since the glass pieces are large, there is little risk of injury from the glass pieces. However, since it is unreinforced, the durability of the glass tableware is low, and it is difficult to handle because it is easily broken. Since the conventional reinforced product with contrast 1 has a compressive stress layer on the glass surface, it is highly durable and difficult to break, but in the event of breakage, there is a high risk of injury because small glass pieces will scatter with a large scattering radius. Become. The sound is also loud.

  Compared with this, since the embodiment of the present invention has a compressive stress layer by the air cooling strengthening method and has high durability, it is difficult to break, and even if broken, the dissipation radius of the glass piece is small and the glass piece is large. Therefore, there is little risk of injury and safety is high. That is, the embodiment is easy to handle because it is difficult to break, and the risk of breakage is small.

In addition, the following products were generally evaluated for non-scattering, transparency, durability, heating with a microwave oven, and price.
(1) Invention product (Example)
Same glass tableware as in the above example (2) Conventional tempered glass product (Comparison 1)
The same glass tableware (3) heat resistant glass product (comparative 3) as the above-mentioned conventional tempered glass product (comparative 1)
Conventional heat-resistant glass tableware made of borosilicate glass and the glass tableware (1), (2), and (3) in comparison with
Non-scattering property Splashing distance of glass pieces when damaged Transparency Transparency of glass tableware Durability of glass tableware Microwave oven Deformation of glass tableware by cooking with microwave oven Price of each glass tableware Comprehensive evaluation The overall evaluation based on the evaluation was compared.

  In the non-scattering property, as in the above-described destructive experiment, the example is “◯”, the proportionality 1 is “x”, and the proportionality 3 is “◯” as the scattering distance of the glass piece is small as in the example. It was. In terms of transparency, the example has a high transparency “」 ”, and the contrast 1 is“ ◯ ”because the transparency is not as high as the embodiment, and the contrast 3 is“ Δ ”because the transparency is low. In terms of durability, the durability of Example 1 and Comparative Example 1 is high and difficult to crack, and Comparative Example 3 is “X” because of low durability and easy cracking. In a microwave oven, each glass tableware is “o” without any deformation or cracking. In terms of price, Example 1 and Comparative Example 1 are “◯” because they are inexpensive because the processing cost is low, and Comparative Example 3 is “X” because they are expensive because of the high cost of the heat-resistant glass. Among the evaluation items in the table, “x” and “△” were zero glass tableware, and the overall evaluation was “A”. A glass table with one “x” was given an overall rating of “B” and a glass table with two or more “x” was given an overall rating of “C”.

  From the results disclosed in the table, the examples are significantly superior to other comparable glassware in any item. In contrast 1, as described above, glass pieces are likely to be scattered at the time of breakage, which is not desirable because safety is not high. In Comparative Example 3, the glass pieces are less likely to be scattered at the time of breakage, but are difficult to handle because they are easily broken and expensive. On the other hand, the glass tableware of an Example is hard to be broken at a low manufacturing cost, is highly safe and easy to handle.

The multipurpose tempered glass tableware of the present invention is made of soda lime glass and has high transparency and heat resistance. Since the compressive stress value of the glass surface is 24.25 to 63.74 MPa (250 to 650 kg / cm ² ) formed by air cooling strengthening, it can be produced at low cost, has durability, and is cracked. It is difficult and easy to handle. Furthermore, since the glass pieces are less likely to scatter when damaged, safety is high. In addition, the multi-purpose tempered glass tableware can be stacked and stored together with the multi-purpose tempered glass tableware, and can also be used as a storage container that can store food by fitting a lid.

DESCRIPTION OF SYMBOLS 10,10B Multipurpose tempered glass tableware 10A Container with lid 20 Tableware main body 21 Mouth part 22 Body part 23 Bottom part 24 Lower body part 30 Girder part 40 Protective rib 50 Holding projection part 60 Lid part 61 Lid body 62 Inserting member 63 Part F Falling object P Pipe

Claims (6)

Cooling is applied to the glass surface made of soda lime glass, and it has a surface layer on which a compressive stress layer having a compressive stress value in the range of 24 to 64 MPa is formed by cooling, forming so that the mouth side is large and the bottom side is small And the tableware body formed into a shape that can be stacked in multiples of the same shape,
A collar formed on the outer periphery of the mouth of the tableware body;
A plurality of protective ribs formed on the outer periphery of the lower body portion of the tableware body;
A multipurpose tempered glass tableware having at least three holding projections formed on the outside of the bottom of the tableware main body.   The multipurpose tempered glass tableware according to claim 1, wherein the tableware body has an inverted truncated pyramid shape or an inverted truncated cone shape.   The multipurpose tempered glass tableware according to claim 1 or 2 which has a lid provided with a fitting part which fits into a collar part formed in the perimeter of the mouth of the tableware main part.   The width | variety of the protective rib formed in the outer periphery of the lower trunk | drum part of the said tableware main body is 1.5-2.0 mm, and height is 0.3-0.7 mm. Multipurpose tempered glass tableware.   The multipurpose tempered glass tableware according to any one of claims 1 to 4, wherein a height of the holding projection formed on the outside of the bottom of the tableware body is 0.5 to 1.0 mm.   The multipurpose tempered glass tableware according to claim 5, wherein the holding protrusions formed on the outside of the bottom of the tableware main body are formed in four arcs.

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