WO2019008495A1 - Procédé de bombage et de stratification de verre mince avec plaque de pression - Google Patents

Procédé de bombage et de stratification de verre mince avec plaque de pression Download PDF

Info

Publication number
WO2019008495A1
WO2019008495A1 PCT/IB2018/054885 IB2018054885W WO2019008495A1 WO 2019008495 A1 WO2019008495 A1 WO 2019008495A1 IB 2018054885 W IB2018054885 W IB 2018054885W WO 2019008495 A1 WO2019008495 A1 WO 2019008495A1
Authority
WO
WIPO (PCT)
Prior art keywords
glass
pressing plate
thin glass
bending
thin
Prior art date
Application number
PCT/IB2018/054885
Other languages
English (en)
Other versions
WO2019008495A4 (fr
Inventor
Mauricio Fernando CORNEJO POL
Charles Stephen Voeltzel
Mario Arturo MANNHEIM ASTETE
Original Assignee
Agp America S.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Agp America S.A. filed Critical Agp America S.A.
Priority to DE112018003400.3T priority Critical patent/DE112018003400T5/de
Publication of WO2019008495A1 publication Critical patent/WO2019008495A1/fr
Publication of WO2019008495A4 publication Critical patent/WO2019008495A4/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
    • 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
    • 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
    • B32B17/10082—Properties of the bulk of a glass sheet
    • B32B17/10119—Properties of the bulk of a glass sheet having a composition deviating from the basic composition of soda-lime glass, e.g. borosilicate
    • 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
    • B32B17/10807—Making laminated safety glass or glazing; Apparatus therefor
    • B32B17/1088—Making laminated safety glass or glazing; Apparatus therefor by superposing a plurality of layered products
    • 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
    • B32B17/10807—Making laminated safety glass or glazing; Apparatus therefor
    • B32B17/10889—Making laminated safety glass or glazing; Apparatus therefor shaping the sheets, e.g. by using a mould
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
    • C03B23/0302—Re-forming glass sheets by bending by press-bending between shaping moulds between opposing full-face shaping moulds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • This invention relates to the field of bending and laminating glazings comprising thin glass layers.
  • Background In response to the regulatory requirements for increased automotive fuel efficiency as well as the growing public awareness and demand for environmentally friendly products, automotive original equipment manufacturers, around the world, have been working to improve the efficiency of their vehicles.
  • One of the key elements of the strategy to improve efficiency has been the concept of light weighting. Often times, more traditional, less expensive, conventional materials and processes are being replaced by innovative new materials and processes which while sometime being more expensive, still have higher utility than the materials and processes being replaced due to their lower weight and the corresponding increase in fuel efficiency.
  • Vehicle glazing has been no exception.
  • Annealed glass is glass that has been slowly cooled from the bending temperature through the glass transition range to relieve any stress in the glass.
  • a laminate two sheets of annealed glass are bonded together using a sheet of thermo-plastic. If the laminated glass should break, the plastic bonding layer holds the shards of glass together, helping to maintain the structural integrity of the glass. The shards of broken glass are held together much like the pieces of a jigsaw puzzle. A vehicle with a broken windshield can still be operated. On impact, the plastic bonding layer also helps to prevent penetration by the occupant or by objects striking the laminate from the exterior. Heat strengthened glass, with a compressive strength in the range of 70 Mpa, can be used in all vehicle positions other than the windshield.
  • Heat strengthened (tempered) glass has a layer of high compression on the outside surfaces of the glass, balanced by tension on the inside of the glass. When tempered glass breaks, the tension and compression are no longer in balance and the glass breaks into small beads with dull edges. Tempered glass is much stronger than annealed laminated glass. The minimum thickness limits of the typical automotive heat strengthening process are in the 3.2 mm to 3.6 mm range. This is due to the rapid heat transfer that is required. It is not possible to achieve the high surface compression needed for a full temper with thinner glass using the typical low pressure air quenching systems.
  • Glass can also be chemically tempered. In this process, ions in and near the outside surface of the glass are exchanged with ions that are larger. This places the outer layer of glass in compression. The maximum strength of chemically tempered soda lime glass is limited. However, with some other glass compositions, compressive strengths in excess of 700 Mpa are possible. The practice of chemically tempering glass is well known to those of ordinary skill in the art and shall not be detailed here.
  • a growing portion of windshields are made by the singlet pressing process. With this process, single sheets of glass are bent using a press to form the glass to shape. The resulting shape is much closer to design and the process can hold tighter tolerances across the surface. Thin glass is difficult to bend using either of these bending process.
  • the edges of the thin glass have a tendency to lift and form wrinkles. If the plies of glass are of different compositions, with softening points that are too far apart, it may not be possible to gravity bend the different compositions simultaneously on the same mold as the glass with the lower softening point will become too soft leading to marking and distortion. In this case, the different glass types must be bent separately. Also, due to the low weight of the glass sheets, they do not sag under their own weight in the same predictable and repeatable way that thicker glass does. Another problem is that the glass may begin to sag too soon, before the entire sheet of glass has become soft enough.
  • Singlet pressing also has problems.
  • the primary one is that as the glass is conveyed through the heating section on rolls it tends to bend under its own weight as it softens resulting in the leading edge hitting the rollers and even falling through.
  • Lamination also presents problems. Due to the high strength of the chemically tempered thin glass sheets, it can be difficult to get the glass to conform to and bond to the other glass layers in the laminate if there is even a small mismatch between the surfaces. This can lead to delamination, trapped air, distortion and wrinkles. This is even more of a problem when cold bending flat or partially bent thin glass layers.
  • Cold bending is a relatively new technology.
  • the glass is bent, while cold to its final shape, without the use of heat.
  • a flat sheet of glass can be bent cold to the contour of the part. This is possible because as the thickness of glass decreases, the sheets becomes increasingly more flexible and can be bent without inducing stress levels high enough to significantly increase the long term probability of breakage.
  • Thin sheets of annealed soda-lime glass in thicknesses of about 1 mm, can be bent to large radii cylindrical shapes (greater than 6 m).
  • the glass to be cold bent is placed with a bent glass layer and with a plastic bonding layer placed between the glass to be cold bent and the bent glass layer.
  • the assembly is placed in what is known as a vacuum bag.
  • the vacuum bag is an airtight set of plastic sheets, enclosing the assembly and bonded together it the edges, which allows for the air to be evacuated from the assembly and which also applies pressure on the assembly forcing the layers into contact.
  • the assembly in the evacuated vacuum bag, is then heated to seal the assembly.
  • the assembly is next placed into an autoclave which heats the assembly and applies high pressure. This completes the cold bending process as the flat glass at this point has conformed to the shape of the bent layer and is permanently affixed.
  • the cold bending process is very similar to a standard vacuum bag/autoclave process, well known in the art, with the exception of having an unbent glass layer added to the stack of glass.
  • the thin glass has a thickness of less than about 1.6 mm.
  • the female mold 14 may be of the periphery support ring type, as shown in the figures 1A to 1C or of the full surface type as shown in the figures 7 to 10.
  • a layer or layers of glass 2, required for the final laminate or as may be required to support the thin glass layer 4 is placed onto the mold prior to the bottom thin glass layer 4.
  • the thin glass layers 4 are then placed onto the female mold 14.
  • the number of sheets that comprise the stack of thin glass layer that can be bent at the same time will depend upon the type of mold used, the thickness of the glass, the glass composition, the size and the complexity of the shape.
  • An innovative process is used to bend a sheet of high bending temperature glass (HBT) to form a pressing plate. This lowers the initial cost of the bending tooling substantially as the cost to fabricate a full surface mold is substantial using conventional materials and methods such as casting and machining metals. Routine maintenance is also substantially reduced as the pressing plate is dimensionally stable and so does not need to be periodically checked for accuracy and adjusted. A method for laminating glazings is also disclosed.
  • HBT high bending temperature glass
  • the method consists in providing at least one thin glass layer and placing at least one additional thin glass layer, assembling such thin glass layers and a plastic bonding interlayer, placing the pressing plate of the invention such that one of the pressing plate's major faces is in contact with the corresponding major face of the top thin glass layer, enclosing the assembled laminate and evacuating the air from the enclosure and applying heat and pressure to the assembly in a standard lamination process.
  • a pressing plate 10 is then placed on the stack of thin glass.
  • the male serves to hold the edge of glass down, preventing wrinkling. Additional weight can be added to the male if needed. In addition, clamping can be added.
  • the male mold is open to allow for radiant heating of the glass. As the glass is heated and begins to soften, the added mass of the pressing plate aids in the bending of the thin glass layers. The bending can be modified by adjusting the thickness and weight of the pressing plate 10 as may be required.
  • the pressing plate is formed by constructing a sand mold to a model of the surface to be bent.
  • the sand mold loaded with a sheet of flat HBT glass, is placed in a furnace and bent to shape.
  • the present invention also claims a laminate produced by the method for bending and the method for laminating. It is also an object of the invention to provide a vehicle comprising the glazing obtained by the methods of the present invention.
  • Figure 1 A shows the isometric view of a bending mold loaded with flat glass and pressing plate.
  • Figure IB shows the front view of a bending mold loaded with flat glass and pressing plate.
  • Figure 1C shows the rear view of a bending mold loaded with flat glass and pressing plate.
  • Figure 2A shows the isometric view of a bending mold with bent glass and pressing plate.
  • Figure 2B shows the front view of a bending mold with bent glass and pressing plate.
  • Figure 2C shows the rear view of a bending mold with bent glass and pressing plate.
  • Figure 3A shows the corner section of a bending mold with bent glass and pressing plate.
  • Figure 3B shows the corner detail of a bending mold with bent glass and pressing plate.
  • Figure 4A shows the cross section of a bending mold.
  • Figure 4B shows the corner detail of a bending mold with glass support layer, thin glass and pressing plate.
  • Figure 4C shows the Isometric view of a bending mold with glass support, thin glass and pressing plate.
  • Figure 5A shows the exploded view of a laminate with cold bent thin glass layer.
  • Figure 5B shows the exploded view of a laminate with thermally bent thin glass layer.
  • Figure 6 shows a typical glass laminate cross section.
  • Figure 7A shows the isometric view of a male surface master tool.
  • Figure 7B shows the isometric view of a male surface master with sand mold box in place.
  • Figure 8 shows the isometric view of a filled mold box.
  • Figure 9A shows the isometric view of a cast female ceramic mold.
  • Figure 9B shows the isometric view of a cast female ceramic mold loaded with flat glass.
  • Figure 10A shows the isometric view of a bent pressing plate.
  • Figure 10B shows the isometric view of a cast female ceramic mold loaded with bent glass.
  • Glass includes but is not limited to: the common soda-lime variety typical of automotive glazing as well as aluminosilicate, lithium aluminosilicate, borosilicate, glass ceramics, and the various other inorganic solid amorphous compositions which undergo a glass transition and are classified as glass included those that are not transparent. Also included are glass like ceramic materials. There are a wide variety of differences in the glass transition temperature range between the various types of glass. The starting point is to pick a glass that has a glass transition range that is sufficiently higher than the glass type that will be bent in the final product. At the forming temperature of the lower temperature glass, the higher temperature glass must retain its shape and strength. In the case of ordinary soda-lime glass or borosilicate glass, an example, certain formulations of lithium aluminosilicate glass meet this criteria.
  • the method for bending thin glass of the present invention comprise the steps of: providing a bending mold and a pressing plate; providing a top thin glass layer and a bottom thin glass layer; placing the at least two thin glass layers onto the bending mold; applying the pressing plate over top of the thin glass layers; heating the pressing plate to at least the softening point of the thin glass; and allowing the glass to sag to the desired shape.
  • the thin glass 4 will tend to sag under its own weight and even further with the added weight of the pressing plate 10.
  • the pressing plate 10 and the thin glass stack will make contact in the central areas. As the thin glass is shielded from much of the radiant heat by the pressing plate 10, the area in direct contact with the pressing plate will heat faster than the edges helping to prevent the early sag problem.
  • the pressing plate 10 will help to form the soft thin glass to the desired shape in conjunction with the female mold 14. This is particularly useful when a ring type periphery support mold is used as there is not contact between the female mold and the glass otherwise. With the pressing plate 10, we can achieve improved dimensional quality.
  • the pressing plate 10 and the thin glass 4 will be in direct contact across the entire surface of the glass. This helps to reduce any thermal gradients that may be present and assists in reducing residual stress as the glass is annealed. The more uniform heating improves the dimensional quality of the finished part as bending tends to be more accurate and repeatable. The full surface contact and improved heat pattern also serves to prevent wrinkles from forming.
  • HBT high temperature glass
  • Sand molds have been in use for well over 100 years in the foundry industry and are well known in the art. There are numerous methods and materials, any of which may be used. As the operating temperature required is lower than the typical mold used for some methods and materials are more economical than others.
  • a male surface model is cut from tooling board or any other suitable tooling material.
  • the mold is enclosed in a box having an open top and metal or wood sides of sufficient strength to contain the sand that will be used to fill the box.
  • the box is then filled with the sand mix, tamped firmly into place to eliminate voids and then cured.
  • the sand mold is inverted, the box and the male model are removed, leaving a female sand mold.
  • a sheet of flat HBT is loaded onto the mold and the mold is then heated to the forming temperature of the HBT and allowed to soak for a period of time sufficient to allow the flat HBT to bend to and take on the shape of the sand mold. The glass is allowed to slowly cool and anneal. The HBT is removed and then used as the pressing plate of the invention.
  • a typical automotive laminate is comprised of two layers of glass, the exterior or outer, 201 and interior or inner, 202 that are permanently bonded together by a plastic bonding interlayer 6 (Figure 6).
  • the glass surface that is on the exterior of the vehicle is referred to as surface one 101 or the number one surface.
  • the opposite face of the exterior glass layer 201 is surface two 102 or the number two surface.
  • the glass 2 surface that is on the interior of the vehicle is referred to as surface four 104 or the number four surface.
  • the opposite face of the interior layer of glass 202 is surface three 103 or the number three surface. Surfaces two 102 and three 103 are bonded together by the plastic bonding interlayer 6.
  • the plastic bonding layer 4 has the primary function of bonding the major faces of adjacent layers to each other.
  • the material selected is typically a clear thermoset plastic.
  • the most commonly used bonding layer 4 (interlayer) is polyvinyl butyral (PVB).
  • PVB has excellent adhesion to glass and is optically clear once laminated. It is produced by the reaction between polyvinyl alcohol and n-butyraldehyde. PVB is clear and has high adhesion to glass. However, PVB by itself, it is too brittle.
  • Plasticizers must be added to make the material flexible and to give it the ability to dissipate energy over a wide range over the temperature range required for an automobile. Only a small number of plasticizers are used.
  • a typical automotive PVB interlayer is comprised of 30-40% plasticizer by weight.
  • ethylene vinyl acetate (EVA), cast in place (CIP) liquid resin and thermoplastic polyurethane (TPU) can also be used.
  • Automotive interlayers are made by an extrusion process with has a thickness tolerance and process variation. As a smooth surface tends to stick to the glass, making it difficult to position on the glass and to trap air, to facilitate the handling of the plastic sheet and the removal or air (deairing) from the laminate, the surface of the plastic is normally embossed contributing additional variation to the sheet. Standard thicknesses for automotive PVB interlayer at 0.38 mm and 0.76 mm (15 and 30 mil).
  • the pressing plate may be formed by press bending, ring type mold gravity bending or by any other means that had the capability to produce the desired shape.
  • the process of fabrication of the present invention provides a full surface pressing plate comprising: a glass sheet having a sufficiently higher glass transition temperature range than the final product composition, such that the pressing plate will maintain its shape at the temperature that the final glass composition is formed; a full surface bending mold of the glass surface; and bending the high temperature glass to the shape on the mold. It should be noted that the difference in temperature between the glass sheet and pressing plate will depend on the glass type of the glass sheet is used. For instance, if Soda Lime is used for the glass sheet, the pressing plate should be a glass of higher transition temperature.
  • the foregoing embodiments will also describe in detail the steps of the method for laminating glazings having thin glass layers.
  • the method of laminating glazings comprises:
  • Embodiment 1 In first embodiment a ring type female mold 14 is first loaded with 5 sheets of thin 0.7 mm clear aluminosilicate glass 4 cut to size. A 6 mm soda lime glass pressing plate 10 is then placed over top of the thin glass 4. The pressing plate 10 is cut slightly larger than the thin glass to make sure that the thin glass 4 is completely covered. After bending, the thin glass 4 is chemically tempered. 2.1 mm soda-lime glass 2 is press bent to shape separately. A laminate is prepared comprising the 2.1 mm bent soda-lime glass 2 outer layer 201 and with an 0.7 mm aluminosilicate inner layer 202. A layer of 0.76 mm transparent polyvinyl butyl (PVB) thermo plastic is placed between the two glass layers.
  • PVB polyvinyl butyl
  • the bent pressing plate covered with a layer of fine mesh fiberglass cloth to prevent scratching, is placed in contact with the surface 204 of the 0.7 thin glass 4 layer 202.
  • the assembled laminate and pressing plate 10 are placed in a plastic "bag", the bag is sealed and a vacuum is drawn. This bag is then processed through a standard autoclave process where heat and pressure are applied. Upon completion of the lamination processed, the pressing plate 10 can be reused.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • a full surface female mold is first loaded with 10 sheets of thin 0.4 mm clear aluminosilicate glass 4 cut to size.
  • An 8 mm infra-red absorbing soda lime glass pressing plate 10 is then placed over top of the thin glass 4.
  • the present invention may include a pressing plate comprised of an infrared absorbing glass composition.
  • the thin glass 4 is chemically tempered.
  • 2.1 mm soda-lime glass 2 is press bent to shape separately.
  • a laminate is prepared comprising the 2.1 mm bent soda-lime glass 2 outer layer 201 and with the 0.4 mm aluminosilicate inner layer 202.
  • a layer of 0.76 mm transparent polyvinyl butyl (PVB) thermo plastic is placed between the two glass layers.
  • the bent pressing plate covered with a layer of fine mesh fiberglass cloth to prevent scratching, is placed in contact with the surface 204 of the thin glass 4 layer 202.
  • the assembled laminate and pressing plate 10 are placed in a plastic "bag", the bag is sealed and a vacuum is drawn. This bag is then processed through a standard autoclave process where heat and pressure are applied. Upon completion of the lamination process, the pressing plate 10 can be reused.
  • Embodiment 3 Embodiment 3:
  • a ring type female mold 14 is first loaded with 4 sheets of thin 1.2 mm clear aluminosilicate glass 4 cut to size.
  • a 6 mm Lithium Silicate glass pressing plate 10 is then placed over top of the thin glass 4. The pressing plate is cut slightly larger than the thin glass to make sure that the thin glass is completely covered.
  • the thin glass 4 is chemically tempered.
  • 2.1 mm soda-lime glass 2 is press bent to shape separately.
  • a laminate is prepared comprising the 2.1 mm bent soda-lime glass 2 outer layer 201 and with the 1.2 mm aluminosilicate inner layer 202.
  • a layer of 0.76 mm transparent polyvinyl butyl (PVB) thermo plastic is placed between the two glass layers.
  • the bent pressing plate covered with a layer of fine mesh fiberglass cloth to prevent scratching, is placed in contact with the surface 204 of the 0.7 thin glass 4 layer 202.
  • the assembled laminate and pressing plate 10 are placed in a plastic "bag", the bag is sealed and a vacuum is drawn. This bag is then processed through a standard autoclave process where heat and pressure are applied. Upon completion of the lamination process, the pressing plate 10 can be reused.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the method used bend the laminate of embodiment 2 is modified with the addition of a 3 mm layer of aluminosilicate glass placed on the mold to provide additional support and to prevent marking of the thin glass.
  • the support layer is discarded after bending.
  • Embodiment 5 is a diagrammatic representation of Embodiment 5:
  • a ring type female mold 14 is first loaded with 5 sheets of thin 1.2 mm clear aluminosilicate glass 4 cut to size.
  • a 6 mm Lithium Silicate glass pressing plate 10 is then placed over top of the thin glass 4. The pressing plate is cut slightly larger than the thin glass to make sure that the thin glass is completely covered.
  • the 1.2 mm thin glass 4 is chemically tempered.
  • a sheet of 0.4 mm aluminosilicate glass is cut to size and then chemically tempered while flat.
  • a laminate is prepared comprising the 1.2 mm bent aluminosilicate 4 outer layer 201 with an 0.4 mm aluminosilicate inner layer 202.
  • a layer of 0.76 mm transparent polyvinyl butyl (PVB) thermo plastic is placed between the two glass layers.
  • the bent pressing plate covered with a layer of fine mesh fiberglass cloth to prevent scratching, is placed in contact with the flat surface 204 of the 0.4 thin glass 4 layer 202.
  • the assembled laminate and pressing plate 10 are placed in a plastic "bag", the bag is sealed and a vacuum is drawn. This bag is then processed through a standard autoclave process where heat and pressure are applied. The pressure and vacuum bend the flat glass to the desired bent shape. Upon completion of the lamination process, the pressing plate 10 can be reused.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Laminated Bodies (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

L'invention concerne du verre mince qui trouve une application croissante dans les stratifiés. Cependant, les procédés de traitement classiques présentent des inconvénients lorsqu'ils sont appliqués à un verre très mince. La présente invention concerne un procédé amélioré de bombage et de stratification de couches de verre mince. La présente invention permet à de multiples feuilles ou couches de verre mince d'être empilées sur un seul moule. Une plaque de pression de surface complète mâle, comprenant une feuille bombée de verre plus épais, est placée sur les feuilles de verre mince. Au fur et à mesure que le verre est chauffé, la masse ajoutée de la plaque de pression aide au bombage. La plaque de pression peut également être utilisée dans le processus de stratification pour empêcher les rides au cours de la stratification. La plaque de pression est constituée d'une composition de verre ayant un point de transition vitreuse plus élevé que le verre mince de telle sorte que la plaque de pression ne se ramollisse pas ou ne se déforme pas lorsque le verre mince est bombé. La plaque de pression est formée par des procédés classiques de bombage de verre.
PCT/IB2018/054885 2017-07-02 2018-07-02 Procédé de bombage et de stratification de verre mince avec plaque de pression WO2019008495A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112018003400.3T DE112018003400T5 (de) 2017-07-02 2018-07-02 Verfahren zum biegen und laminieren von dünnglas mit einer pressplatte

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201762528129P 2017-07-02 2017-07-02
US62/528,129 2017-07-02
CONC2017/0009263A CO2017009263A1 (es) 2017-09-13 2017-09-13 Método para el doblado, curvado y laminado de vidrio delgado con una prensa de placa
CONC2017/0009263 2017-09-13

Publications (2)

Publication Number Publication Date
WO2019008495A1 true WO2019008495A1 (fr) 2019-01-10
WO2019008495A4 WO2019008495A4 (fr) 2019-04-04

Family

ID=62596733

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2018/054885 WO2019008495A1 (fr) 2017-07-02 2018-07-02 Procédé de bombage et de stratification de verre mince avec plaque de pression

Country Status (3)

Country Link
CO (1) CO2017009263A1 (fr)
DE (1) DE112018003400T5 (fr)
WO (1) WO2019008495A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0351739A2 (fr) * 1988-07-18 1990-01-24 Asahi Glass Company Ltd. Procédé et appareil pour bomber des plaques en verre pour un verre laminé

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0351739A2 (fr) * 1988-07-18 1990-01-24 Asahi Glass Company Ltd. Procédé et appareil pour bomber des plaques en verre pour un verre laminé

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "Laminated glass", 11 May 2017 (2017-05-11), XP055514248, Retrieved from the Internet <URL:https://en.wikipedia.org/w/index.php?title=Laminated_glass&oldid=779810554> [retrieved on 20181010] *

Also Published As

Publication number Publication date
CO2017009263A1 (es) 2018-01-31
DE112018003400T5 (de) 2020-03-12
WO2019008495A4 (fr) 2019-04-04

Similar Documents

Publication Publication Date Title
US9925743B2 (en) Process for laminating thin glass laminates
KR102665441B1 (ko) 냉간 성형 적층물
JP5981647B2 (ja) 薄ガラス積層板を積層するための方法
EP0414232B1 (fr) Verre laminé et procédé de bombage de feuilles de verre pour obtenir un verre laminé
JPH03131539A (ja) 曲げ成型用プレス型とガラス板の曲げ成型方法及びその装置
US11192341B2 (en) Method for producing a curved composite glass pane having a thin glass pane
CN107001135B (zh) 夹层玻璃的制造方法
JPH04119931A (ja) ガラス板の曲げ成形方法
CN108312668A (zh) 一种夹层曲面玻璃复合材料及其制造方法
US10995028B2 (en) Method and apparatus for bending thin glass
JP2023029989A (ja) プロセス
CN113771433A (zh) 车用夹层玻璃
CN111183124B (zh) 汽车用夹层玻璃及其制造方法
CN108178529A (zh) 一种夹层曲面玻璃的制造方法
WO2019008496A1 (fr) Procédé de cintrage et de stratification de verre mince avec plaque de recouvrement
WO2019008495A1 (fr) Procédé de bombage et de stratification de verre mince avec plaque de pression
JP2022014222A (ja) 合わせガラスの製造方法
WO2019008470A1 (fr) Procédé de stratification de verre mince avec plaque de pression
US20210221103A1 (en) Process
JPH0530770B2 (fr)
WO2022224910A1 (fr) Verre feuilleté pour vitres d&#39;automobile, automobile et procédé de fabrication de verre feuilleté pour vitres d&#39;automobile
JPS6317777B2 (fr)
JPH0729793B2 (ja) 合せガラス用合せ素板ガラスの曲げ成形加工方法及びその装置
JP2022160783A (ja) 車両窓用合わせガラスの製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18758720

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 18758720

Country of ref document: EP

Kind code of ref document: A1