Search

EP-3778509-B1 - METHOD FOR MANUFACTURING A GLASS PANEL UNIT, AND METHOD FOR MANUFACTURING A GLASS WINDOW

EP3778509B1EP 3778509 B1EP3778509 B1EP 3778509B1EP-3778509-B1

Inventors

  • ISHIBASHI, TASUKU
  • URIU, EIICHI
  • HASEGAWA, KAZUYA
  • ABE, HIROYUKI
  • NONAKA, MASATAKA
  • SHIMIZU, TAKESHI
  • ISHIKAWA, HARUHIKO

Dates

Publication Date
20260506
Application Date
20190313

Claims (4)

  1. A method for manufacturing a glass panel unit (10), the method comprising: an adhesive disposing step of disposing a thermal adhesive including a first portion (410) and a second portion (420) on a first panel (20) or a second panel (30), the first portion (410) being disposed to have a rectangular frame shape and being to serve as a seal (40) later, the second portion (420) being disposed inside the first portion (410) with a distance from the first portion (410); a glass composite generation step of disposing the second panel (30) to face the first panel (20) to generate a glass composite which includes the first panel (20), the second panel (30), and the thermal adhesive and which has an evacuation port (700) and an evacuation path (600), the evacuation port (700) being formed in at least any one of the first panel (20), the second panel (30), or the first portion (410), and the evacuation path (600) being located between the first portion (410) and the second portion (420) and extending to the evacuation port (700); an internal space forming step of heating the glass composite to melt the thermal adhesive to form an internal space (500) surrounded by the first panel (20), the second panel (30), and a melted substance of the thermal adhesive except for the evacuation port (700); an evacuation step of exhausting gas from the internal space (500) to evacuate the internal space (500); and an evacuated space forming step of, while the internal space (500) is kept in an evacuated state, heating part of the first portion (410) and pushing, by means of a jig (830), the part of the first portion (410) toward the second portion (420) to deform the part of the first portion (410) to close the evacuation path (600) such that the internal space (500) is sealed to form an evacuated space (50) hermetically closed.
  2. The method of claim 1, wherein the glass composite has one or more ventilation paths (610) between the first portion (410) and a third portion (430) of the thermal adhesive, and the evacuated space forming step includes heating and applying force to part of at least the first portion (410) or the third portion (430) to deform the part of at least the first portion (410) or the third portion (430) to close the ventilation path (610) such that the internal space (500) is divided into a plurality of evacuated spaces (50).
  3. The method of claim 1 or 2, further comprising a second internal space forming step of forming a second internal space (540) by disposing: a third panel (90), and a third thermal adhesive between a third panel (90) and either the first panel (20) or the second panel (30), the second internal space (540) being surrounded by the third panel (90), the first panel (20) or the second panel (30), and the third thermal adhesive.
  4. A method for manufacturing a glass window (95), the method comprising step of fitting the glass panel unit (10) manufactured by the method of any one of claims 1 to 3 in a window frame (96) to manufacture a glass window (95).

Description

Technical Field The present invention relates to a method for manufacturing a glass panel unit and a method for manufacturing a glass window. Background Art Patent Literature 1 discloses an insulated glazing including a pair of flat glass panes facing each other with a prescribed distance therebetween and a method for manufacturing the insulated glazing. The method for manufacturing the insulated glazing disclosed in Patent Literature 1 includes a first melting step of achieving a temperature higher than or equal to a softening point temperature of glass frit contained in a frit seal and a partition. In this way, peripheral portions of the pair of flat glass panes are sealed together, thereby forming a space which is hermetically closable. The space is evacuated, and then, a second melting step is performed to heat the pair of flat glass panes and the glass frit, thereby sealing an evacuation port. Since the method for manufacturing the insulated glazing disclosed in Patent Literature 1 heats the pair of flat glass panes and the entirety of the glass frit in the second melting step, a large quantity of unnecessary gas is released from the entirety of the glass frit, which may lower the degree of vacuum of the space. EP 2 851 351 A1 describes a production method of multiple panes including hermetically bonding, with a sealing member, peripheries of paired glass panels disposed facing each other at a predetermined distance to form a space to be hermetically enclosed between the glass panels; evacuating air from the space through an outlet to make the space be in a reduced pressure state; and dividing, after the space is made be in the reduced pressure state, the space by a region forming member into an outlet region including the outlet and a reduced pressure region other than the outlet region. WO 2017/056419 A1 describes a method for manufacturing a glass panel unit including the steps of disposing a glass adhesive to have one part as a low step part thinner than the other part of the glass adhesive; disposing a first substrate including at least a first glass substrate and a second substrate including at least a second glass substrate to face each other; and heating glass composite to form an inner space; reducing the pressure of the inner space; and forming a vacuum space from the inner space. EP 3 269 688 A1 describes a manufacturing method for glass panel unit enabling efficient manufacture of a glass panel unit with desired shape and dimensions. A first glass substrate and a second glass substrate which are placed to face each other with a seal member in-between are bonded to each other with the seal member. Subsequently, the first glass substrate, the seal member, and the second glass substrate are cut collectively along a cut plane passing through the seal member from one of the first glass substrate and the second glass substrate bonded to each other. WO 2017/056421 A1 describes a glass panel unit including a first panel including at least a first glass plate; a second panel arranged to face the first panel and including at least a second glass plate; a frame member formed in a shape of a frame corresponding in shape to respective peripheral portions which extend along edges of the first panel and the second panel, and bonded to the peripheral portions; and at least one spacer provided in a vacuum space between the first panel and the second panel. WO 2017/169253 A1 describes a glass panel unit including a first glass pane; a second glass pane facing the first glass pane; a frame member which has a frame shape and which the first and second glass panes are bound together through; and spacers containing a resin and disposed between the first and second glass panes. A depressurized space is provided between the first glass pane and the second glass pane. Citation List Patent Literature Patent Literature 1: JP 2015-147727 A Summary of Invention One of the objectives of the present disclosure is to provide a method for manufacturing a glass panel unit which releases a reduced quantity of unnecessary gas and a method for manufacturing a glass window. The underlying object is solved by the method for manufacturing a glass panel unit according to independent claim 1 and by the method for manufacturing a glass window according to independent claim 4. Specific embodiments are defined in the remaining dependent claims. Brief Description of Drawings FIG. 1 is a vertical sectional view schematically illustrating a glass panel unit of a first embodiment that may be manufactured by a method for manufacturing the glass panel unit according to the invention;FIG. 2 is a partially cutaway plan view schematically illustrating the glass panel unit;FIG. 3 is a vertical sectional view schematically illustrating a temporary assembly of the glass panel unit;FIG. 4 is a partially cutaway plan view schematically illustrating the temporary assembly;FIG. 5 is a view illustrating the method for manufacturing the glass panel uni