US 11,913,277 B2
Method for manufacturing glass panel unit
Hiroyuki Abe, Osaka (JP); Eiichi Uriu, Osaka (JP); Kazuya Hasegawa, Osaka (JP); Tasuku Ishibashi, Ishikawa (JP); Masataka Nonaka, Osaka (JP); Takeshi Shimizu, Osaka (JP); and Haruhiko Ishikawa, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/258,267
Filed by PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
PCT Filed Jun. 19, 2019, PCT No. PCT/JP2019/024182
§ 371(c)(1), (2) Date Jan. 6, 2021,
PCT Pub. No. WO2020/026624, PCT Pub. Date Feb. 6, 2020.
Claims priority of application No. 2018-144261 (JP), filed on Jul. 31, 2018.
Prior Publication US 2021/0270084 A1, Sep. 2, 2021
Int. Cl. E06B 3/677 (2006.01); C03C 27/06 (2006.01); E06B 3/66 (2006.01); E06B 3/663 (2006.01); E06B 3/673 (2006.01)
CPC E06B 3/6775 (2013.01) [C03C 27/06 (2013.01); E06B 3/6612 (2013.01); E06B 3/66333 (2013.01); E06B 3/66357 (2013.01); E06B 3/67334 (2013.01); E06B 2003/66338 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for manufacturing a glass panel unit, the method comprising an assembling step, a bonding step, a gas exhausting step, a sealing step, and an activating step,
the assembling step including providing an assembly,
the assembly including:
a first glass pane;
a second glass pane arranged to face the first glass pane;
a peripheral wall formed in a frame shape and provided between the first glass pane and the second glass pane;
an internal space surrounded with the first glass pane, the second glass pane, and the peripheral wall;
a gas adsorbent disposed in the internal space; and
an exhaust port allowing the internal space to communicate with an external environment,
the bonding step including melting the peripheral wall in a baking furnace at a first predetermined temperature to hermetically bond the first glass pane and the second glass pane together with the peripheral wall thus melted,
the gas exhausting step including exhausting a gas from the internal space through the exhaust port in the baking furnace to turn the internal space into a vacuum space,
the sealing step including maintaining a temperature in the baking furnace at a second predetermined temperature equal to or lower than the first predetermined temperature and locally heating to a temperature higher than the second predetermined temperature, and thereby melting, a port sealing material inserted into the exhaust port to seal the exhaust port and thereby obtain a work in progress,
the activating step including activating the gas adsorbent after the sealing step to obtain a glass panel unit, and
the sealing step including locally heating the port sealing material through one glass pane having no exhaust port and selected from the group consisting of the first glass pane and the second glass pane.