Glass panel unit, glass window provided with same, and method for manufacturing glass panel unit
A glass panel unit includes: a first panel; a second panel facing the first panel; a sealing member bonded to respective facing peripheral portions of the first panel and the second panel; and at least one spacer provided in a reduced pressure space between the first panel and the second panel. The at least one spacer includes a resin body and at least one ultraviolet protective layer provided on a surface of the resin body.
1. A method for manufacturing a glass panel unit which includes:
a first panel including at least a first glass plate;
a second panel facing the first panel and including at least a second glass plate;
a sealing member formed in a frame shape and bonded hermetically to respective facing peripheral portions of the first panel and the second panel; and
at least one spacer provided in an inner space between the first panel and the second panel,
wherein the inner space being a reduced pressure space,
the at least one spacer including a resin body and at least one ultraviolet protective layer provided on a surface of the resin body, and
the spacer being formed by punching a composite sheet including a resin sheet and the ultraviolet protective layer formed either on one surface or on both surfaces of the resin sheet,
the method comprising:
a composite sheet forming step of forming the ultraviolet protective layer on at least one surface of the resin sheet;
a spacer forming step of forming a plurality of spacers by punching the composite sheet including the resin sheet and the ultraviolet protective layer;
a spacer arrangement step of arranging the plurality of spacers between a first substrate including at least a first glass substrate and a second substrate including at least a second glass substrate;
a glass adhesive disposing step of disposing a glass adhesive in a frame shape between the first substrate and the second substrate;
an evacuation step of evacuating a space located between the first substrate and the second substrate and surrounded with the glass adhesive; and
a bonding step of bonding the first substrate and the second substrate together with the glass adhesive in the shape of the frame.
2. A method for manufacturing a glass panel unit which includes:
a first panel including at least a first glass plate;
a second panel facing the first panel and including at least a second glass plate;
a sealing member formed in a frame shape and bonded hermetically to respective facing peripheral portions of the first panel and the second panel; and
at least one spacer provided in an inner space between the first panel and the second panel,
wherein the inner space being a reduced pressure space,
the at least one spacer including a resin body and at least one ultraviolet protective layer provided on a surface of the resin body, and
the spacer being formed by punching a composite sheet including a resin sheet and the ultraviolet protective layer formed either on one surface or on both surfaces of the resin sheet,
the method comprising:
a composite sheet forming step of forming the ultraviolet protective layer on at least one surface of the resin sheet;
a spacer forming step of forming a plurality of spacers by punching the composite sheet including the resin sheet and the ultraviolet protective layer;
a step including disposing a glass adhesive in a frame shape on a peripheral portion of a surface of a first substrate including at least a first glass substrate, and arranging the plurality of spacers in a space surrounded with the glass adhesive;
a substrate arrangement step of arranging a second substrate including at least a second glass substrate to allow the second substrate to face the surface of the first substrate on which the glass adhesive is disposed;
an evacuation step of evacuating a space located between the first substrate and the second substrate and surrounded with the glass adhesive; and
a bonding step of bonding the first substrate and the second substrate together with the glass adhesive in the shape of the frame.