JP2017019706A - Glass member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass member capable of securing impact resistance needed for a window body of a screen door while achieving enhancement of see through property and reduction of weight.SOLUTION: There is provided a glass member 14 used for a window body of a screen door 1 arranged on a platform P and having one or a plurality of chemically reinforced glass 15 and an organic resin film layer 16. Total thickness of the chemically reinforced glass 15 is 1.8 mm to 7.0 mm and surface compressive stress of one or the plurality of chemically reinforced glass 15 is 400 MPa to 800 MPa.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a glass member used for a window body of a screen door installed on a platform.

  2. Description of the Related Art In recent years, in order to prevent passengers from falling from a platform, contact of passengers with a running railway vehicle, etc., it has been promoted to install a screen door along an edge on the track side of the platform. For example, Patent Document 1 describes a screen door that includes a door panel and a door pocket that can store the door panel, and the door panel reciprocates between a position stored in the door pocket and a position pulled out of the door pocket. . In this screen door, a window portion is provided on the door panel, and a transparent window body made of polycarbonate resin is incorporated in the window portion.

Japanese Patent Application Laid-Open No. 2014-97736

  In the window body of the screen door described in the above-mentioned Patent Document 1, the transparency of the window body is likely to decrease due to rubbing due to contact with the door pocket or the like, or ultraviolet deterioration, and the replacement frequency of the window body may increase. is there. Moreover, since the smoothness of the window body surface is low, there is a possibility that the fluoroscopic image may be distorted. The window body of the screen door as described above is required to be transparent and to be installed on a reciprocating door panel. Moreover, since there is a possibility that passengers or the like come into contact with each other, impact resistance is also required.

  By the way, it is conceivable to use, for example, a glass member such as float glass (raw glass) or air-cooled tempered glass as the window body in order to suppress the deterioration of the transparency and reduce the distortion of the fluoroscopic image. However, when float glass (green plate glass) is used as the window, the strength per weight of the float glass is relatively low, so that the strength per weight required for the window of the screen door cannot be satisfied. There is a possibility that impact properties cannot be secured. In addition, when air-cooled tempered glass is used as the window body, the air-cooled tempered glass tends to cause tempering distortion on the surface during the tempering process, which may cause distortion in the fluoroscopic image. Furthermore, when air-cooled tempered glass is used as the window body, the balance of internal stress of the air-cooled tempered glass is lost, which may cause natural breakage that suddenly breaks even when no load is applied. Further, the air-cooled tempered glass has a problem that when even a part of the glass is broken, the entire surface is broken into grains, which blocks the field of view and does not contribute to the strength at all.

  An object of one aspect of the present invention is to provide a glass member that can ensure impact resistance required for a window body of a screen door while improving transparency and reducing weight.

  A glass member according to one aspect of the present invention is a glass member used for a window body of a screen door installed on a platform, and includes one or a plurality of chemically strengthened glass and an organic resin film layer, and is chemically strengthened. The total thickness of the glass is 1.8 mm or more and 7.0 mm or less, and the surface compressive stress of the one or more chemically strengthened glasses is 400 MPa or more and 800 MPa or less.

  This glass member includes one or a plurality of chemically strengthened glasses having a total thickness of 1.8 mm to 7.0 mm. Since chemically strengthened glass is used, the thickness of the window can be reduced and the weight can be reduced as compared with the case where float glass is used. Further, since chemically tempered glass is used, distortion of the fluoroscopic image can be reduced and occurrence of natural breakage can be suppressed as compared with the case where air-cooled tempered glass is used. Further, even when a part of the glass is broken, the entire surface is not broken into grains, and the visibility and strength can be ensured. Furthermore, since the total thickness of the chemically strengthened glass is 7.0 mm or less, the weight can be reduced, and a glass member that is suitably used for a window body of a screen door can be obtained. In addition, since the total thickness of the chemically strengthened glass is 1.8 mm or more, it is difficult to bend and it is difficult to cause distortion in the fluoroscopic image. Furthermore, in this glass member, the surface compressive stress of chemically strengthened glass is 400 MPa or more and 800 MPa or less. Since the surface compressive stress of the chemically strengthened glass is 400 MPa or more, the strength per weight required for the window body of the screen door can be satisfied, and impact resistance can be ensured. Further, the surface hardness of the glass is increased, and even when a sharp umbrella tip or scattered objects come into contact with each other, scratches are hardly formed. Moreover, since the surface compressive stress of chemically tempered glass is 800 MPa or less, the balance between the compressive stress layer on the glass surface and the tensile stress layer inside the glass becomes good, and the occurrence of breakage that occurs when the balance is not good Is suppressed. Therefore, according to this glass member, it is possible to ensure the impact resistance required for the window body of the screen door while improving the transparency and reducing the weight.

  The surface compressive stress of the one or more chemically strengthened glasses may be 650 MPa or more. According to this configuration, the impact resistance required for the window portion of the screen door can be ensured more reliably.

  Two chemically strengthened glasses are bonded together via an organic resin film layer, and the thickness of each of the two chemically strengthened glasses may be 1.0 mm or more and 3.5 mm or less. According to this configuration, it is possible to obtain a glass member that is lightweight, has high impact strength, and hardly distorts the fluoroscopic image.

  The breaking strength of the organic resin film layer may be 30 MPa or more, and the breaking elongation of the organic resin film layer may be 250% or more. According to this configuration, since the strength of the organic resin film layer can be ensured, even when the glass member is broken, the organic resin film layer is hardly broken and scattering of glass pieces can be suppressed.

  The thickness of the organic resin film layer may be 0.7 mm or greater and 1.6 mm or less. According to this configuration, it is difficult to cause distortion in the fluoroscopic image, and it is possible to suppress scattering of the glass piece when it is broken.

  The organic resin film layer may be bonded to one piece of chemically strengthened glass, and the thickness of the chemically strengthened glass may be 3.0 mm or greater and 5.0 mm or less. According to this configuration, it is difficult to cause distortion in the fluoroscopic image, and it is possible to suppress scattering of the glass piece when it is broken.

  The breaking strength of the organic resin film layer may be 100 MPa or more, and the breaking elongation of the organic resin film layer may be 80% or more. According to this configuration, since the strength of the organic resin film layer can be ensured, even when the glass member is broken, the organic resin film layer is hardly broken and scattering of glass pieces can be suppressed.

  The thickness of the organic resin film layer may be 50 μm or more and 130 μm or less. According to this configuration, it is difficult to cause distortion in the fluoroscopic image, and it is possible to suppress scattering of the glass piece when it is broken.

  According to one aspect of the present invention, it is possible to provide a glass member that can ensure impact resistance necessary for a window body of a screen door while improving transparency and reducing weight.

It is a perspective view of the screen door concerning a 1st embodiment. It is sectional drawing in the II-II line of FIG. It is sectional drawing of the screen door which concerns on 2nd Embodiment. It is sectional drawing of the screen door which concerns on a modification. (A) is a figure which shows the result of the weight per unit area of an Example, a falling ball test, and a shot bag test, (b) is the weight per unit area of a comparative example, a falling ball test, and a shot bag test. It is a figure which shows the result.

  Hereinafter, embodiments according to one aspect of the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are used for the same or corresponding elements, and duplicate descriptions are omitted.

[First Embodiment]
As shown in FIG. 1, the screen door 1 according to the first embodiment is installed along the edge of the platform P on the track side. The screen door 1 is a movable fence for preventing a passenger from falling from the platform P or a passenger's contact with a running railway vehicle. For example, a plurality of screen doors 1 are arranged along the edge of the platform P on the track side.

  The screen door 1 includes a door panel 10 and a door pocket 20 that can store the door panel 10. The door panel 10 is disposed on the platform P at a position corresponding to the entrance / exit of a railway vehicle that stops on the platform P. The door panel 10 reciprocates between a position housed in the door pocket 20 and a position pulled out from the door pocket 20 by a drive mechanism (not shown). A pair of door panels 10 and door pockets 20 are provided for one entrance. The space between the pair of door pockets 20 is closed by moving the pair of door panels 10 in directions opposite to each other and pulling them out of the door pocket 20. In addition, the pair of door panels 10 move in opposite directions and are stored in the door pocket 20, so that the space is opened.

  The door panel 10 includes a frame body 11 having a window portion 12 and a transparent glass member (window body) 14 incorporated in the window portion 12. For example, the frame 11 is formed in a rectangular plate shape from metal, and a window portion 12 having a rectangular cross section is provided vertically above the center. As shown in FIG. 2, in the frame 11, a groove 13 having a rectangular cross section for receiving the periphery of the glass member 14 is provided on each of the four inner surfaces defining the window 12. The groove portion 13 is opened inside the window portion 12.

  The glass member 14 is a laminated glass in which two chemically strengthened glasses 15 are bonded through an organic resin film layer (intermediate film) 16. In this example, the two chemically strengthened glasses 15 are the same as each other, and are bonded so that their edges coincide. The organic resin film layer 16 is affixed over the entire surface of the chemically strengthened glass 15. The organic resin film layer 16 may be a single film having substantially the same planar shape as the chemically strengthened glass 15 or may be divided into a plurality of sheets.

  The glass member 14 is incorporated in the window portion 12 so that the periphery thereof is disposed in the groove portion 13. The glass member 14 is fixed to the frame body 11 by arranging a seal member 31 and a backup material 32 between the front and back surfaces of the glass member 14 and the frame body 11. The seal member 31 closes the space between the glass member 14 and the frame body 11 in a watertight manner, for example, at two opposite sides of the window portion 12. The backup material 32 is disposed outside the seal member 31 and contributes to the positioning of the seal member 31.

  As shown in FIGS. 1 and 2, the door pocket 20 is formed in a rectangular box shape from metal, for example. A space for accommodating the door panel 10 is formed inside the door pocket 20. The door pocket 20 is fixed to the platform P via, for example, a support 33 fixed to the platform P.

  The operation of the screen door 1 is controlled by control means (not shown). For example, the screen door 1 closes the space between the pair of door pockets 20 by the pair of door panels 10 during a time period when the railcar is not stopped on the platform P, and the pair of doors 10 when the railcar stops on the platform P. The space is opened by storing the door panel 10 in the door pocket 20. When the space is opened, passengers can get into the railway vehicle through the space. At this time, since the door panel 10 is provided with the window portion 12, it is possible to visually recognize the side beyond the door panel 10 through the window portion 12 before the door panel 10 is opened and the entrance / exit passage is opened. Yes. Thereby, for example, when there is a gap between the platform P and the railway vehicle, the passenger can visually recognize the gap in advance before the door panel 10 is opened, thereby improving safety.

  Hereinafter, the configuration of the glass member 14 will be further described. First, the chemically strengthened glass 15 will be described. In the chemically strengthened glass 15, an alkali metal atom having a small ionic radius on the glass surface is replaced with an alkali metal atom having a large ionic radius by an ion exchange method or the like (for example, lithium and / or sodium atoms on the glass surface are potassium Thus, a large compressive stress (surface compressive stress) is applied to the glass surface layer. The strength of the chemically strengthened glass 15 is increased as compared with a non-tempered glass plate such as float glass or an air-cooled tempered glass tempered by a wind-cooling method. For this reason, the chemically strengthened glass 15 is hard to break. Further, in the chemically tempered glass 15, the distortion of the fluoroscopic image is reduced as compared with the float glass and the air-cooled tempered glass. Further, in the chemically strengthened glass 15, the occurrence of natural breakage is suppressed as compared with the case where the air-cooled strengthened glass is used.

  In addition, the present inventors have found that according to the chemically strengthened glass 15, glass pieces scattered at the time of destruction can be reduced. The reason is presumed as follows. When the glass breaks, the breaking energy applied to the glass is converted into energy for surface formation (fracture surface formation), and many fracture surfaces are formed on the glass surface. Since the strength of the chemically strengthened glass 15 is increased, the destruction energy applied at the time of destruction is large, and the surface formation energy is accordingly increased. As a result, many fracture surfaces are formed on the glass surface at the time of destruction or breakage, and the scattered glass pieces are small. In addition, when the surface compressive stress of the chemically strengthened glass 15 is increased, the energy of fracture applied at the time of fracture is further increased, and accordingly, the energy of surface formation is further increased accordingly, and in order to increase the surface area accordingly, Glass fragments scattered at the time of destruction or breakage are further reduced.

  The height of the chemically strengthened glass 15 is 500 mm or more and 1800 mm or less, and the width of the chemically strengthened glass 15 is 500 mm or more and 1500 mm or less. In this example, both the height and width of the chemically strengthened glass 15 are about 1000 mm. In addition, the dimension of the chemically strengthened glass 15 is not specifically limited, What is necessary is just a magnitude | size used to the window body of the screen door 1.

  The total thickness of the two chemically strengthened glasses 15 is 1.8 mm or greater and 7.0 mm or less. The total thickness of the chemically strengthened glass 15 is preferably 2.0 mm or greater and 5.0 mm or less, and particularly preferably 3.5 mm or greater and 5.0 mm or less. In the glass member 14, since the total thickness of the chemically strengthened glass 15 is 7.0 mm or less, weight reduction can be achieved and the glass member 14 used suitably for the window body of the screen door 1 can be obtained. Moreover, since the total thickness of the chemically strengthened glass 15 is 1.8 mm or more, it is hard to bend and it is hard to produce distortion in a fluoroscopic image.

  The thickness of one chemically strengthened glass 15 is 0.9 mm or more and 3.5 mm or less. The thickness of one chemically strengthened glass 15 is preferably 1.0 mm or more and 2.5 mm or less, and particularly preferably 1.8 mm or more and 2.5 mm or less. In the glass member 14, since the thickness of the single chemically strengthened glass 15 is 1.0 mm or more and 2.5 mm or less, a glass member that is lightweight, has high impact strength, and hardly causes distortion in a fluoroscopic image can be obtained. Note that the thicknesses of the two chemically strengthened glasses 15 may be different from each other. In that case, the thickness of each of the two chemically strengthened glasses 15 should just be in the said range.

  The surface compressive stress of the chemically strengthened glass 15 is 400 MPa or more and 800 MPa or less. The surface compressive stress of the chemically strengthened glass 15 is preferably 500 MPa or more, and particularly preferably 650 MPa or more. When the surface compressive stress of the chemically strengthened glass 15 is less than 400 MPa, the strength is inferior, and thus the strength per weight (impact resistance) required for the window body of the screen door 1 cannot be satisfied. Furthermore, the glass piece scattered at the time of destruction tends to be large. On the other hand, in the glass member 14, since the surface compressive stress of the chemically strengthened glass 15 is 400 MPa or more, the strength per weight required for the window body of the screen door 1 can be satisfied. Moreover, the glass piece scattered at the time of destruction can be made small. On the other hand, the strength per weight of the chemically strengthened glass 15 increases as the surface compressive stress increases. However, when the surface compressive stress of the chemically strengthened glass 15 exceeds 800 MPa, the surface compressive stress layer and the internal tensile stress layer The balance may decrease, and it may be easy to break with a slight strain. On the other hand, in the glass member 14, since the surface compressive stress of the chemically strengthened glass 15 is 800 MPa or less, occurrence of such breakage is suppressed. In addition, when the glass member 14 is comprised by several sheets of chemically strengthened glass 15, the surface compressive stress of all the chemically strengthened glass needs to be in the said range. Moreover, in this specification, surface compressive stress is the value which measured the compressive stress in the surface with the surface stress measuring device.

  The chemically strengthened glass 15 is manufactured as follows, for example. That is, a float glass plate such as a general-purpose soda lime silicate glass is immersed in a molten alkali metal salt such as a potassium salt. Thereby, lithium ions or sodium ions in the glass composition are replaced with potassium ions having a large ionic radius. Thereby, a compressive stress is generated by the volume which is increased by potassium ions, and the surface compressive stress is improved. Examples of potassium salts include potassium nitrate, potassium sulfate, potassium bisulfate, potassium carbonate, potassium bicarbonate, and potassium chloride.

  The melting temperature varies depending on the type of potassium salt. For example, in the case of potassium nitrate, it is preferably 350 to 500 ° C, more preferably 370 to 480 ° C, and particularly preferably 450 to 480 ° C. When the temperature is lower than 350 ° C., the time for performing the chemical strengthening treatment becomes long and the productivity is poor. On the other hand, when the melting temperature is raised, the chemical strengthening treatment time is shortened, but even if it exceeds 500 ° C, the chemical strengthening treatment time is not significantly shortened, and depending on the type of potassium salt used, harmful gas is generated. However, the work environment may be impaired.

  The immersion time is not particularly limited because it varies depending on the thickness of the float glass plate and the surface compressive stress of the resulting chemically strengthened glass 15. For example, when a chemically tempered glass 15 having a surface compressive stress of 400 MPa or more and 800 MPa or less is obtained using a float glass plate having a thickness of 3 mm or more and 6 mm or less, it is contained in molten potassium nitrate at 450 to 500 ° C. for 1 to 5 hours, preferably What is necessary is just to immerse for 2 to 4 hours.

  The organic resin film layer 16 is made of, for example, a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, or the like, and includes a vinyl polymer, an ethylene-vinyl monomer copolymer, a styrene copolymer, and a polyurethane resin. It is preferably composed of one or more selected from fluororesins and acrylic resins. Especially, since it is excellent in economical efficiency and the workability in a manufacturing process, a vinyl-type polymer and / or an ethylene-vinyl-type monomer copolymer are more preferable.

  The thickness of the organic resin film layer 16 is 0.7 mm or more and 1.6 mm or less. The thickness of the organic resin film layer 16 is preferably 0.7 mm or greater and 1.0 mm or less. In the glass member 14, since the thickness of the organic resin film layer 16 is 0.7 mm or more and 1.6 mm or less, it is difficult to cause distortion in the fluoroscopic image, and scattering of the glass piece when it is broken can be suppressed. .

  The breaking strength of the organic resin film layer 16 is 30 MPa or more, and the breaking elongation of the organic resin film layer 16 is 250% or more. The breaking strength of the organic resin film layer 16 is preferably 30 MPa or more and 200 MPa or less. The breaking elongation of the organic resin film layer 16 is preferably from 300% to 500%, particularly preferably from 400% to 500%. As such an organic resin film layer 16, what was comprised by 1 type of resin selected from polyvinyl butyral, an ethylene vinyl acetate copolymer, and an ionomer resin is mentioned. If the breaking strength and breaking elongation of the organic resin film layer 16 are within these ranges, the strength of the organic resin film layer 16 can be ensured. Therefore, even if the glass member 14 is broken, the organic resin film layer 16 It is difficult to break, and scattering of glass pieces can be suppressed. In this specification, the breaking strength and breaking elongation are values measured according to JIS K 7161.

  The glass member 14 is manufactured as follows, for example. That is, a sheet-like organic resin film material is placed on the first chemically strengthened glass 15, and the second chemically strengthened glass 15 is overlaid on the first chemically strengthened glass 15, and pre-pressed under heat by a roll press method or the like. After that, the main pressure bonding is performed in an autoclave at 1 to 12 atmospheres and 120 to 160 ° C., and the two chemically strengthened glasses 15 are bonded by the organic resin film layer 16. Alternatively, a gap is provided between the two chemically strengthened glasses 15, and after injecting a liquid ultraviolet curable composition as an organic resin film material into the gap, the organic resin film material is cured by irradiating with ultraviolet rays. Two chemically strengthened glasses 15 may be bonded together by forming the resin film layer 16.

[Second Embodiment]
A screen door according to a second embodiment will be described with reference to FIG. The screen door according to the second embodiment is different from the screen door 1 according to the first embodiment in that a glass member 14 </ b> A is incorporated in the window portion 12.

  The glass member 14A is a single plate glass in which an organic resin film layer 16A is bonded to a single chemically strengthened glass 15A. The glass member 14A is incorporated in the window 12 so that the organic resin film layer 16A is located on the line side. The thickness of the chemically strengthened glass 15A of the glass member 14A is 1.8 mm or greater and 7.0 mm or less. The thickness of the chemically strengthened glass 15A is preferably 3.0 mm or greater and 5.0 mm or less, and more preferably 3.5 mm or greater and 5.0 mm or less. If the thickness of the chemically strengthened glass 15A is 3.0 mm or more and 5.0 mm or less, it is difficult to cause distortion in the fluoroscopic image, and scattering of the glass pieces when broken can be suppressed. The surface compressive stress of the chemically strengthened glass 15A is the same as that of the first embodiment.

  The organic resin film layer 16A is attached to one side of the chemically strengthened glass 15A with an adhesive or the like. The adhesive is not particularly limited, and various types can be used. The thickness of the organic resin film layer 16A is not less than 50 μm and not more than 130 μm. The thickness of the organic resin film layer 16A is preferably 50 μm or more and 100 μm or less. In the glass member 14A, since the thickness of the organic resin film layer 16A is not less than 50 μm and not more than 130 μm, it is difficult for the fluoroscopic image to be distorted, and scattering of the glass pieces when broken can be suppressed.

  The breaking strength of the organic resin film layer 16A is 100 MPa or more, and the breaking elongation of the organic resin film layer 16A is 80% or more. The breaking strength of the organic resin film layer 16A is preferably 100 MPa or more and 250 MPa or less. The breaking elongation of the organic resin film layer 16A is preferably 100% or more and 400% or less. Examples of the organic resin film layer 16A include a polyethylene terephthalate film, a polycarbonate film, and a polyamide film, and a polyethylene terephthalate film is more preferable. If the breaking strength and breaking elongation of the organic resin film layer 16A are within these ranges, the strength of the organic resin film layer 16A can be secured, so that even if the glass member 14A is broken, the organic resin film layer 16A It is difficult to break, and scattering of glass pieces can be suppressed.

  Moreover, you may comprise like the screen door which concerns on the modification shown by FIG. The screen door which concerns on a modification differs from the screen door which concerns on 2nd Embodiment in the attachment aspect with respect to the window part 12 of 14 A of glass members. In the screen door according to the modification, the groove 13 </ b> B is provided on the inner surface of the frame body 11 at the opposite end on the track side. And the sealing member 34 is arrange | positioned between the surface by which the organic resin film layer 16A in the glass member 14A was affixed, and the frame body 11, and the side surface and frame body 11 which follow the front and back both surfaces in the glass member 14A. The glass member 14 </ b> A is fixed to the frame body 11 by arranging the seal member 35 therebetween. For example, the seal member 34 and the seal member 35 are watertightly closed between the glass member 14 </ b> A and the frame body 11 at two opposite sides of the window portion 12.

  Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples.

[Example 1]
A soda lime silicate float glass plate having a width of 800 mm, a height of 1000 mm, and a thickness of 3.0 mm is immersed in molten potassium nitrate by heating to about 450 ° C. for 4.0 hours to obtain a surface compressive stress of 680 MPa and a thickness of 3 A chemically strengthened glass A having a thickness of 0.0 mm and a weight per unit area of 7.5 kg / m ² was obtained. On the chemically strengthened glass A, a polyvinyl butyral film having a thickness of 0.762 mm is placed as a polymer intermediate film (organic resin film layer). Further, the chemically strengthened glass A is placed on the glass, and pre-bonding and main-bonding are performed. A glass member (laminated glass) of Example 1 having a total thickness of 6.0 mm was manufactured. The glass member had a weight per unit area of 15.82 kg / m ² .

[Example 2]
A soda lime silicate float glass plate having a width of 800 mm, a height of 1000 mm, and a thickness of 2.0 mm is immersed in molten potassium nitrate heated to about 450 ° C. for 4.0 hours, and has a surface compressive stress of 680 MPa and a thickness of 1 A chemically strengthened glass B having a weight of .8 mm and a weight per unit area of 5.0 kg / m ² was obtained. On the chemically tempered glass B, an ethylene-vinyl monomer copolymer film having a thickness of 0.762 mm is placed as a polymer intermediate film (organic resin film layer). The glass member (laminated glass) of Example 2 having a total glass portion thickness of 3.6 mm was manufactured by pressure bonding. The glass member had a weight per unit area of 10.82 kg / m ² .

[Example 3]
A soda lime silicate float glass plate having a width of 800 mm, a height of 1000 mm, and a thickness of 3.0 mm is immersed in molten potassium nitrate heated to about 450 ° C. for 3.5 hours to obtain a surface compressive stress of 530 MPa and a thickness of 3 A chemically strengthened glass C having a thickness of 0.0 mm and a weight per unit area of 7.5 kg / m ² was obtained. On the chemically tempered glass C, a polyvinyl butyral film having a thickness of 0.762 mm is placed as a polymer intermediate film (organic resin film layer). Further, the chemically tempered glass C is further placed thereon, pre-crimped and finally crimped, and glass A glass member (laminated glass) of Example 3 having a total thickness of 6.0 mm was produced. The glass member had a weight per unit area of 15.82 kg / m ² .

[Example 4]
A soda lime silicate float glass plate having a width of 800 mm, a height of 1000 mm, and a thickness of 1.1 mm is immersed in molten potassium nitrate by heating to about 450 ° C. for 4.0 hours to obtain a surface compressive stress of 680 MPa and a thickness of 1 A chemically strengthened glass D having a thickness of 0.1 mm and a weight per unit area of 2.75 kg / m ² was obtained. On the chemically tempered glass D, a polyvinyl butyral film having a thickness of 0.762 mm is placed as a polymer intermediate film (organic resin film layer), and further a chemically tempered glass B is placed thereon, followed by pre-compression bonding and main-compression bonding. A glass member (laminated glass) of Example 4 having a total thickness of 2.2 mm was produced. The glass member had a weight per unit area of 6.32 kg / m ² .

[Example 5]
A polyethylene terephthalate film having a thickness of 60 μm was pressure-bonded to the chemically strengthened glass A to produce a glass member (single plate glass) of Example 5 having a total glass portion thickness of 3.0 mm. The mass per unit area of this glass member was 8.24 kg / m ² .

[Comparative Example 1]
A soda lime silicate float glass plate having a width of 800 mm, a height of 1000 mm, and a thickness of 3.0 mm was immersed in molten potassium nitrate for about 2.0 hours by heating to about 450 ° C., and a surface compressive stress of 320 MPa and a thickness of 3 A chemically strengthened glass E having a thickness of 0.0 mm and a weight per unit area of 7.5 kg / m ² was obtained. On the chemically tempered glass E, a polyvinyl butyral film having a thickness of 0.762 mm is placed as a polymer intermediate film (organic resin film layer), and a chemically tempered glass A is further placed thereon, and pre-crimping and main-crimping are performed. A glass member (laminated glass) of Comparative Example 1 having a total thickness of 6.0 mm was produced. The glass member had a weight per unit area of 15.82 kg / m ² .

[Comparative Example 2]
A 0.762 mm thick polyvinyl butyral film is placed on the chemically tempered glass A as a polymer interlayer (organic resin film layer), and a 3.0 mm thick soda lime silicate float that is not further chemically reinforced. A glass plate was placed, pre-bonded, and main-bonded to produce a glass member (laminated glass) of Comparative Example 2 having a total glass portion thickness of 6.0 mm. The glass member had a weight per unit area of 15.82 kg / m ² .

[Comparative Example 3]
A soda lime silicate float glass plate having a width of 800 mm, a height of 1000 mm, and a thickness of 1.1 mm was immersed in molten potassium nitrate by heating to about 450 ° C. for 2.5 hours to obtain a surface compressive stress of 380 MPa and a thickness of 1 A chemically strengthened glass F having a thickness of 0.1 mm and a weight per unit area of 2.75 kg / m ² was obtained. On the chemically tempered glass F, a polyvinyl butyral film having a thickness of 0.762 mm is placed as a polymer intermediate film (organic resin film layer), and a chemically tempered glass D is further placed on the polyvinyl butyral film. A glass member (laminated glass) of Comparative Example 3 having a total thickness of 2.2 mm was produced. The glass member had a weight per unit area of 6.32 kg / m ² .

[Comparative Example 4]
A polyethylene terephthalate film having a thickness of 60 μm similar to that in Example 5 was pressure-bonded to a commercially available air-cooled tempered glass having a thickness of 6 mm and a weight per unit area of 15.0 kg / m ² to obtain a total thickness of the glass portion. Produced a glass member (single plate glass) of Comparative Example 4 having a thickness of 6.0 mm. The glass member had a weight per unit area of 15.74 kg / m ² .

[Falling ball test]
A falling ball test was conducted in accordance with “7.6 falling ball test” defined in JIS R 3205. A 610 mm square was cut out from the glass members of Examples 1 to 5 and Comparative Examples 1 to 4, and used as test pieces. The procedure for the falling ball test was as follows. A steel ball having a mass of 1040 g was dropped once from a height at which the drop height reached a predetermined value with respect to the test piece placed horizontally. When the test piece was broken, the drop height was used as an evaluation result. When the test piece did not break, the drop height was sequentially increased according to a predetermined order until the test piece broke, the steel balls were dropped, and the drop height at which the test piece broke was used as the evaluation result. The order of increasing the drop height was 300 mm, 600 mm, 900 mm, 1200 mm, 1500 mm, 1900 mm, 2400 mm, 3000 mm, 3800 mm, 4800 mm. In Comparative Example 1, the evaluation was performed with the chemically strengthened glass E side as the surface in contact with the steel ball. In Comparative Example 2, the soda lime silicate float glass plate side was evaluated as the surface in contact with the steel balls. In Comparative Example 3, the evaluation was performed with the chemically tempered glass F side as the surface in contact with the steel ball.

[Shot bag test]
A shot bag test was conducted in accordance with “7.7 shot bag test” defined in JIS R 3205. From the glass members of Examples 1 to 5 and Comparative Examples 1 to 4, a width of 765 mm and a height of 920 mm were cut out and used as test pieces. The procedure for the shot bag test was as follows. A pendulum, which is an impactor with a mass of 45 kg, was adjusted so that the lowest point of the pendulum was at the center of the test piece with respect to the test piece installed perpendicular to the ground. After holding the impactor at a position where the height from the lowest point becomes a predetermined value, the impactor was dropped freely in a pendulum manner, and the vicinity of the center point of the test piece was impacted once. When the test piece was broken, the drop height was used as an evaluation result. If the test piece did not break, raise the height from the lowest point in order according to a predetermined sequence until the test piece broke, and let the impactor fall free in a pendulum manner, from the lowest point where the test piece broke Was used as the evaluation result. The order of increasing the height from the lowest point was 300 mm, 380 mm, 480 mm, 610 mm, 770 mm, 960 mm, 1200 mm, 1500 mm, 1900 mm, 2300 mm. In Comparative Example 1, the evaluation was performed with the chemically tempered glass E side as the surface with which the impactor contacts. In Comparative Example 2, the soda lime silicate float glass plate side was evaluated as the surface with which the impactor contacted. In Comparative Example 3, the evaluation was performed with the chemically tempered glass F side as the surface in contact with the steel ball.

  FIG. 5 shows the results of the weight per unit area, the falling ball test, and the shot bag test of the glass members of Examples 1 to 5 and Comparative Examples 1 to 4. From the results of Examples 1 to 4, when the glass member was laminated glass, the results of the falling ball test and the shot bag test were improved as the thickness of the glass member increased and the weight per unit area increased. I understand. When Examples 1 and 3 having the same weight per unit area and Comparative Examples 1 and 2 were compared, Examples 1 and 3 showed larger values than Comparative Examples 1 and 2 in both the falling ball test and the shot bag test. It can be seen that the glass member of the present invention is excellent in impact strength.

  On the other hand, when Example 2 and Comparative Example 2 having the same values of the falling ball test and shot bag test are compared, the weight per unit area of Example 2 is smaller than that of Comparative Example 2, and in the glass member of the present invention, It can be seen that the weight can be reduced. Similar results can be seen from a comparison between Example 5 and Comparative Example 4 of the single glass member. Further, from the comparison between Example 4 and Comparative Example 3, when the surface compressive stress of one of the two chemically strengthened glasses is less than 400 MPa, the strength per weight required for the window body of the screen door 1. It was confirmed that was not obtained.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. The present invention can be modified without departing from the scope described in the claims or applied to other embodiments. May be.

  For example, in the first embodiment, the glass member 14 includes two chemically strengthened glasses 15, and in the second embodiment, the glass member 14A includes one chemically strengthened glass 15A. Three or more chemically strengthened glasses may be provided.

DESCRIPTION OF SYMBOLS 1 ... Screen door, 14, 14A ... Glass member, 15, 15A ... Chemically tempered glass, 16 ... Organic resin film layer, P ... Platform.

Claims (8)

A glass member used for a window body of a screen door installed on a platform,
One or a plurality of chemically strengthened glass and an organic resin film layer,
The total thickness of the chemically strengthened glass is 1.8 mm or more and 7.0 mm or less,
The glass member whose surface compressive stress of said 1 or a plurality of chemically strengthened glass is 400MPa or more and 800MPa or less.   The glass member according to claim 1, wherein the surface compressive stress of the one or more chemically strengthened glasses is 650 MPa or more. Two sheets of the chemically strengthened glass are bonded together via the organic resin film layer,
The glass member according to claim 1 or 2, wherein each of the two chemically strengthened glasses has a thickness of 1.0 mm or more and 3.5 mm or less.   The glass member according to claim 3, wherein the breaking strength of the organic resin film layer is 30 MPa or more, and the breaking elongation of the organic resin film layer is 250% or more.   The thickness of the said organic resin film layer is a glass member of Claim 3 or 4 which is 0.7 mm or more and 1.6 mm or less. The organic resin film layer is bonded to one piece of the chemically strengthened glass,
The glass member according to claim 1 or 2, wherein a thickness of the chemically strengthened glass is 3.0 mm or greater and 5.0 mm or less.   The glass member according to claim 6, wherein the breaking strength of the organic resin film layer is 100 MPa or more, and the breaking elongation of the organic resin film layer is 80% or more.   The glass member according to claim 6 or 7, wherein the organic resin film layer has a thickness of 50 µm to 130 µm.

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