ARMORED GLAZING MANUFACTURED FROM MASS-PRODUCED LAMINATED GLAZING CONSTITUENTS

Abstract

A process for manufacturing a light armored curved laminated glazing intended to be fitted in an opening of a transport vehicle suitable for the mass-production fitting of a curved laminated glazing containing two glass sheets, wherein use is made of at least three constituent curved glass sheets of such mass-produced curved laminated glazing containing two glass sheets, including both sheets from one and the same such mass-produced curved laminated glazing containing two glass sheets, which have been previously bent together.

Claims

1. A process for manufacturing a light armored curved laminated glazing intended to be fitted in an opening of a transport vehicle suitable for a mass-production fitting of a curved laminated glazing containing two glass sheets, the process comprising assembling together at least three constituent curved glass sheets of such mass-produced curved laminated glazing containing two glass sheets to form said light armored curved laminated glazing, said at least three curved glass sheets including both sheets from one and a same such mass-produced curved laminated glazing containing two glass sheets, which have been previously bent together.

2. The process as claimed in claim 1, wherein the assembling together of at least three constituent glass sheets includes assembling together at least four constituent glass sheets of said mass-produced curved laminated glazing containing two glass sheets, wherein the at least four constituent glass sheets include two pairs of glass sheets and wherein the glass sheets in each of the two pairs have been previously bent together.

3. The process as claimed in claim 1, wherein the assembling together of at least three constituent glass sheets includes assembling together at most six constituent glass sheets of said mass-produced curved laminated glazing containing two glass sheets, wherein the at most six constituent glass sheets include three pairs of glass sheets and wherein the glass sheets in each of the three pairs have been previously bent together.

4. The process as claimed in claim 1, wherein the assembling comprises joining to the two glass sheets forming said one and the same mass-produced curved laminated glazing, on a side of an outer sheet thereof, at least one outer glass sheet intended for another mass-produced curved laminated glazing containing two glass sheets, and/or on a side of an inner sheet, is at least one inner glass sheet intended for another mass-produced curved laminated glazing containing two glass sheets.

5. The process as claimed in claim 1, wherein the assembling comprises joining to the two glass sheets forming said one and the same mass-produced curved laminated glazing, on one side or the other thereof, two glass sheets, in adjacent position, intended for at least one other mass-produced curved laminated glazing containing two glass sheets.

6. A light armored curved laminated glazing manufactured as claimed in claim 1, wherein the glass sheets which form the light armored curved laminated glazing each have a thickness of between 1 and 4 mm.

7. The curved laminated glazing as claimed in claim 6, wherein the glass sheets which form the light armored curved laminated glazing each have a thickness at least equal to 1.3 mm.

8. The curved laminated glazing as claimed in claim 6, wherein the glass sheets which form the light armored curved laminated glazing each have a thickness at most equal to 3.2 mm.

9. The curved laminated glazing as claimed in claim 6, wherein the glass sheets which form the light armored curved laminated glazing are bonded to one another by an interlayer adhesive.

10. The curved laminated glazing as claimed in claim 9, wherein at least one interlayer adhesive comprises an ionomer resin.

11. The curved laminated glazing as claimed in claim 6, wherein a face of the curved laminated glazing intended to be oriented toward an inside of a passenger compartment consists of a polycarbonate sheet having a thickness of between 1.8 and 4 mm, which is bonded to a glass sheet by a layer of polyurethane.

12. The curved laminated glazing as claimed in claim 6, wherein a face of the curved laminated glazing intended to be oriented toward an inside of a passenger compartment consists of a polyethylene terephthalate sheet provided with a scratch-resistant and/or functional coating and bonded to a glass sheet by a layer of polyurethane or polyvinyl butyral.

13. A method comprising manufacturing a motor vehicle windshield with a curved laminated glazing as claimed in claim 1.

14. The method as claimed in claim 13, wherein the motor vehicle windshield is a light police vehicle or truck windshield.

15. The curved laminated glazing as claimed in claim 11, wherein the thickness is between 2.2 and 3.3 mm.

16. A process for manufacturing a light armored curved laminated glazing to be fitted in an opening of a transport vehicle, the method comprising: selecting a first pair of curved glass sheets from a group of mass-produced pairs of curved glass sheets for manufacturing curved laminated glazings that each contain two glass sheets; selecting at least one curved glass sheet from a second pair of curved glass sheets from the group of mass-produced pairs of curved glass sheets for manufacturing curved laminated glazings that each contain two glass sheets, wherein the curved glass sheets in the first pair of curved glass sheets have been previously bent together, and wherein the curved glass sheets in the second pair of curved glass sheets have been previously bent together and separately from the curved glass sheets of the first pair of curved glass sheets, and assembling together the first pair of curved glass sheets with the at least one curved glass sheet of the second pair of curved glass sheets.

17. The process as claimed in claim 16, wherein the assembling comprises assembling together the first pair of curved glass sheets with both curved glass sheets of the second pair of curved glass sheets.

18. The process as claimed in claim 16, wherein the selecting comprises selecting at least one curved glass sheet from a third pair of curved glass sheets from the group of mass-produced pairs of curved glass sheets for manufacturing curved laminated glazings that each contain two glass sheets, wherein the curved glass sheets in the third pair of curved glass sheets have been previously bent together and separately from the curved glass sheets of the first pair of curved glass sheets and separately from the curved glass sheets of the second pair of curved glass sheets and wherein the assembling comprises assembling together the first pair of curved glass sheets with both curved glass sheets of the second pair of curved glass sheets and with the at least one curved glass sheet of the third pair of curved glass sheets.

19. The process as claimed in claim 17, wherein the assembling comprises assembling together the first pair of curved glass sheets with both curved glass sheets of the second pair of curved glass sheets and with both curved glass sheets of the third pair of curved glass sheets.

Description

EXAMPLE 1

[0024] A light armored windshield is manufactured from clear soda-lime float glass sheets bent in pairs with a view to forming mass-produced laminated windshields containing two glass sheets. The inner glass sheets have a thickness of 1.6 mm, the outer glass sheets have a thickness of 2.1 mm.

[0025] The inner face of the inner glass sheets, referred to as face 4 in the laminates containing two glass sheets, face 1 being the one in contact with the external atmosphere, bears a screenprinting annealed in the bending furnace.

[0026] Assembled, from the inside toward the outside of the laminate, are the inner glass sheet and the outer glass sheet that are intended for a first mass-produced windshield containing two glass sheets, the outer glass sheet intended for a second mass-produced windshield containing two glass sheets, then the outer glass sheet intended for a third mass-produced windshield containing two glass sheets. The glass sheets are bonded in pairs by a sheet of stretched polyvinyl butyral having a thickness of 0.6 mm.

[0027] According to a first variant, a 2.5 mm sheet of polycarbonate (PC) is bonded to the inner face of said inner glass sheet by means of a 1.9 mm thick layer of polyurethane.

[0028] According to a second variant, a complex consisting of a 0.38 mm, respectively 0.76 mm, sheet of plasticized PVB and of a 0.18 mm sheet of polyethylene terephthalate (PET) coated with a layer of polysiloxane, sold by the company DUPONT DE NEMOURS under the registered trademark Spallshield® SG2—157, respectively—307, is bonded to the inner face of said inner glass sheet.

EXAMPLE 2

[0029] A light armored windshield is manufactured from soda-lime float glass sheets bent in pairs with a view to forming mass-produced laminated windshields containing two glass sheets. The inner glass sheets have a thickness of 1.4 mm, the outer glass sheets have a thickness of 1.6 mm.

[0030] The inner glass sheets are clear, the outer glass sheets are tinted and their inner face, referred to as face 2 in the laminates containing two glass sheets, bears a screenprinting that has in particular the function of hiding an underlying electrical connection and/or the peripheral ablation or demargination of thin layers on the outer face of the inner glass sheets, for example.

[0031] Assembled in this example, this time from the outside toward the inside of the laminate, are the outer glass sheet and the inner glass sheet that are intended for a first mass-produced windshield containing two glass sheets, then successively the inner glass sheet intended for a second, a third, a fourth then a fifth mass-produced windshield containing two glass sheets.

[0032] The same adhesive interlayer is used between two glass sheets as in the preceding example, and the same shatterproof partial laminate consisting of the polyurethane layer and of the polycarbonate sheet is assembled on the inner face of the partial laminate consisting of all the glass sheets bonded to one another.

[0033] It is possible to use acoustic PVB in order to bond certain glass sheets together, or all the glass sheets, or else to replace one or more PVB layer(s) with a high mechanical performance resin, in particular an ionomer resin sold by the company DuPont de Nemours under the registered trademark SentryGlas® Plus, in a thickness of 0.89, 1.52 or 2.28 mm in particular. The relative thinness of the glass sheets of the curved laminated glazing of the invention is particularly well suited to the use of this ionomer resin, the cooling of which is thus accelerated with respect to that which occurs with thicker glass sheets.

[0034] It is also possible to use several pairs of thicknesses of outer sheets, respectively inner sheets, of mass-produced laminates containing two glass sheets, inter alia: [0035] 2.1, respectively 2.1 mm; [0036] 2.6, respectively 2.1 mm, in particular.

EXAMPLE 3

[0037] Example 1 is reproduced, apart from the difference that the glass portion consists exclusively of two mass-produced curved laminated glazings containing two glass sheets, which are heated before being laminated together, and that all the interlayer adhesives consist of a 0.89 mm layer of an ionomer resin sold by the company DuPont de Nemours under the registered trademark SentryGlas® Plus.

[0038] The glazings from examples 1 to 3 have a desired functionality of ballistic protection and protection with respect to penetration. With respect to small-scale productions, shorter manufacturing times, an improvement in the optical quality of the glazing, in the stability, the accuracy of its geometry, and therefore in its adaptation to the body opening into which it is intended to be installed, are obtained.