GB2223981A - Laminated glass - Google Patents
Laminated glass Download PDFInfo
- Publication number
- GB2223981A GB2223981A GB8820709A GB8820709A GB2223981A GB 2223981 A GB2223981 A GB 2223981A GB 8820709 A GB8820709 A GB 8820709A GB 8820709 A GB8820709 A GB 8820709A GB 2223981 A GB2223981 A GB 2223981A
- Authority
- GB
- United Kingdom
- Prior art keywords
- glass
- thickness
- sheet
- laminate
- bonding agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000005340 laminated glass Substances 0.000 title claims abstract description 18
- 239000011521 glass Substances 0.000 claims abstract description 24
- 239000007767 bonding agent Substances 0.000 claims abstract description 11
- 239000004431 polycarbonate resin Substances 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 229920005668 polycarbonate resin Polymers 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 17
- 238000010276 construction Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
- B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
- B32B17/10045—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets with at least one intermediate layer consisting of a glass sheet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/08—Dimensions, e.g. volume
- B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
- B32B2309/105—Thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/006—Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
Landscapes
- Joining Of Glass To Other Materials (AREA)
- Laminated Bodies (AREA)
Abstract
A glass laminate comprises first and second sheets (10, 12) of glass bonded together by a layer of a bonding agent (11), the thickness of the first sheet of glass being significantly greater than the thickness of the second sheet of glass such that the impact resistance of the laminate is significantly greater in one direction than the other. In a typical application, the thickness of the first sheet of glass may be of the order of three times the thickness of the second sheet of glass, with the impact resistance of the laminate in said one direction three times that in the other direction. The characteristics of the bonding agent will be so chosen as to provide the required bonding strengths in conjunction with the requisite impact cushioning effect. A preferred bonding agent is a polycarbonate resin. <IMAGE>
Description
LAMINATED GLASS
Field of the Invention
This invention relates to laminated glass.
Background to the Invention
Typical applications of laminated glass include vehicle windscreens (both front and rear) and security screens such as are used in banks and building societies.
Situations have arisen where, because of the strength of a sheet of glass, it has been difficult to obtain egress from a vehicle or premises in an emergency. It is accordingly an object of the present invention to provide an improved form of laminated glass which enables this difficulty to be overcome,
Summary of the Invention
According to the present invention there is provided a glass laminate comprising first and second sheets of glass bonded together by a layer of a bonding agent, the thickness of the first sheet of glass being significantly greater than the thickness of the second sheet of glass such that the impact resistance of the laminate is significantly greater in one direction than the other.
In a typical application, the thickness of the first sheet of glass may be of the order of three times the thickness of the second sheet of glass, with the impact resistance of the laminate in said one direction three times that in the other direction.
The characteristics of the bonding agent will be so chosen as to provide the required bonding strengths in conjunction with the requisite impact cushioning effect. A preferred bonding agent is a polycarbonate resin.
For security applications, a multi-ply construction may be employed with two or more laminates as defined above adhered together by means of a transparent adhesive.
Brief Description of the Drawings
Figure 1 shows a glass laminate for use in, for example, a vehicle windscreen,
Figure 2 shows a multi-ply glass laminate for security purposes.
Description of the Preferred Embodiments
As shown in Figure 1, a sheet of laminated glass for use in the manufacture of a vehicle windscreen includes three layers.
The first or outermost layer comprises a first sheet 10 of glass. The second or intermediate layer comprises a layer 11 of a poly-carbonate resin and the third or inner layer comprises a second sheet 12 of glass. In a typical application, the thickness of the first sheet 10 is 3 millimetres; the thickness of the bonding layer 11 is 1 millimetre and the thickness of the second sheet 12 is also 1 millimetre.
Impact strength tests have been carried out to compare the strength characteristics of the laminate of Figure 1 with the laminated glass currently used in vehicle windscreens which consists of two sheets of glass 3 millimetres in thickness bonded together by a layer of a bonding agent of 0.3 millimetres thickness, When the impact test is carried out from what would be the outside of a vehicle, i.e. with the impact applied to the surface of the first sheet 10, the laminate has an impact strength slightly in excess of that of a conventional windscreen whereas, when the impact test is carried out from what would be the inside of the vehicle, the impact strength is approximately one-third of the figure obtained when the impact is applied to the first sheet 10.
This means that, as compared to current windscreens, the glass laminate of Figure 1 has considerably improved strength/ weight characteristics as regards external impact whereas, if an impact is applied to what would be the inside surface of a windscreen, the laminate can be relatively easily broken.
If, therefore, the vehicle is involved in an accident, arld a person within the vehicle is unable to open the doors of the vehicle, it is much easier to smash the windscreen and obtain egress from the vehicle in that manner.
If the bonding agent which is used is a poly-carbonate, the characteristics of the bonding agent can be such that it is resistant to weathering. This means that, not only can the laminate be used for the vehicle windscreen, which is sealed around the whole of its' periphery, but the laminate can also be used for opening side windows of the vehicle. The glass laminate of Figure 1 can thus be used in vehicle applications in place of the toughened glass currently used for vehicle side windows.
Turning next to Figure 2, this shows a section of a security glass for use in, for example, a bank or building society, the construction of Figure 2 being a multi-ply construction consisting of a first laminate formed from layers 20, 21 and 22 and a second laminate consisting of layers 24, 25 and 26, each of said laminates being as described above in relation to Figure 1. Thus, layers 20 and 24 are sheets of glass 3 millimetres in thickness; layers 21 and 25 are 1 millimetre thickness layers of a poly-carbonate resin and layers 22 and 26 are 1 millimetre thickness sheets of glass. The central layer 23 comprises a layer of a transparent rubber-like adhesive which is extremely resilient and has substantially no shock absorbing characteristics.The impact strength of the laminate of Figure 2 from the one side, i.e. the top as shown in Figure 2, is an order of magnitude greater than the impact strength from the other side.
The multi-ply laminate of Figure 2 may be made up from sheets of different thicknesses, for example, the glass sheets 20 and 24 may be 4 millimetres thickness, the poly-carbonate layers 21 and 25 may be 1 millimetre in thickness, the glass sheets 22 and 26 may be 0.5 millimetres in thickness and the adhesive layer 23 may also be 0.5 millimetres in thickness.
With this ratio between the thicknesses of the sheets 20 and 24 to the thicknesses of the sheets 22 and 26 of eight to one, an even greater degree of contrast between the impact strengths of the laminate in the two directions is obtained.
Such a laminate can be used for high security purposes, for example in the external windows of banks, providing the required degree of security against intruders whilst in the event of emergencles enabling bank staff to break the window from the inslde to obtain exit through the window.
Claims (5)
1. A glass laminate comprising first and second sheets of glass bonded together by a layer of a bonding agent, the thickness of the first sheet of glass being significantly greater than the thickness of the second sheet of glass such that the impact resistance of the laminate is significantly greater in one direction than the other.
2, A glass laminate according to claim 1 in which the thickness of the first sheet of glass is of the order of three times the thickness of the second sheet of glass.
3. A glass laminate according to claim 1, in which the bonding agent is a poly-carbonate resin.
4. A multi-ply glass laminate comprising two or more laminates according to claim 1 bonded together.
5. A glass laminate substantially as hereinbefore described with reference to and as shown in Figure 1 or Figure 2 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8820709A GB2223981A (en) | 1988-09-01 | 1988-09-01 | Laminated glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8820709A GB2223981A (en) | 1988-09-01 | 1988-09-01 | Laminated glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8820709D0 GB8820709D0 (en) | 1988-10-05 |
| GB2223981A true GB2223981A (en) | 1990-04-25 |
Family
ID=10643039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8820709A Withdrawn GB2223981A (en) | 1988-09-01 | 1988-09-01 | Laminated glass |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2223981A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD559203S1 (en) | 2006-11-14 | 2008-01-08 | Littelfuse, Inc. | Indicator for a fuse |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1345538A (en) * | 1970-07-29 | 1974-01-30 | Triplex Safety Glass Co Ltd Me | Toughened glass sheets |
| GB1426650A (en) * | 1972-02-22 | 1976-03-03 | Hoechst Ag | Stabilised polyvinyl butyral compositions and additives for polyvinyl butyral |
| GB1502771A (en) * | 1974-01-29 | 1978-03-01 | Glaverbel | Laminated glazing pane |
| GB1511933A (en) * | 1975-04-16 | 1978-05-24 | Degussa | (meth)acrylate syrup |
| GB1524625A (en) * | 1975-04-16 | 1978-09-13 | Degussa | Bullet-proof laminated glass |
| GB2019777A (en) * | 1977-12-23 | 1979-11-07 | Bfg Glassgroup | A Windscreen for a Motor Vehicle |
| GB1580366A (en) * | 1976-04-02 | 1980-12-03 | Bfg Glassgroup | Laminated safety pane |
| GB2134445A (en) * | 1983-02-01 | 1984-08-15 | Pilkington Brothers Plc | Laminated glazing unit |
| EP0137613A1 (en) * | 1983-08-10 | 1985-04-17 | The Post Office | Improvements in or relating to security glazing |
| GB2156736A (en) * | 1984-04-04 | 1985-10-16 | Pilkington Brothers Plc | An impact-resistant laminate |
-
1988
- 1988-09-01 GB GB8820709A patent/GB2223981A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1345538A (en) * | 1970-07-29 | 1974-01-30 | Triplex Safety Glass Co Ltd Me | Toughened glass sheets |
| GB1426650A (en) * | 1972-02-22 | 1976-03-03 | Hoechst Ag | Stabilised polyvinyl butyral compositions and additives for polyvinyl butyral |
| GB1502771A (en) * | 1974-01-29 | 1978-03-01 | Glaverbel | Laminated glazing pane |
| GB1511933A (en) * | 1975-04-16 | 1978-05-24 | Degussa | (meth)acrylate syrup |
| GB1524625A (en) * | 1975-04-16 | 1978-09-13 | Degussa | Bullet-proof laminated glass |
| GB1580366A (en) * | 1976-04-02 | 1980-12-03 | Bfg Glassgroup | Laminated safety pane |
| GB2019777A (en) * | 1977-12-23 | 1979-11-07 | Bfg Glassgroup | A Windscreen for a Motor Vehicle |
| GB2134445A (en) * | 1983-02-01 | 1984-08-15 | Pilkington Brothers Plc | Laminated glazing unit |
| EP0137613A1 (en) * | 1983-08-10 | 1985-04-17 | The Post Office | Improvements in or relating to security glazing |
| GB2156736A (en) * | 1984-04-04 | 1985-10-16 | Pilkington Brothers Plc | An impact-resistant laminate |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD559203S1 (en) | 2006-11-14 | 2008-01-08 | Littelfuse, Inc. | Indicator for a fuse |
| USD577688S1 (en) | 2006-11-14 | 2008-09-30 | Littelfuse, Inc. | Indicator for a fuse |
| USD577687S1 (en) | 2006-11-14 | 2008-09-30 | Littelfuse, Inc. | Indicator for a fuse |
| USD581881S1 (en) | 2006-11-14 | 2008-12-02 | Littelfuse, Inc. | Indicator for a fuse |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8820709D0 (en) | 1988-10-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |