Glass panel unit assembly, method for manufacturing glass panel unit, work in progress of glass panel unit, and glass panel unit
A glass panel unit assembly includes a pair of glass substrates arranged to face each other, a peripheral wall, a partition, an air passage, and an evacuation port. The peripheral wall has a frame shape and is provided between the pair of glass substrates. The partition partitions an internal space, surrounded with the pair of glass substrates and the peripheral wall, into a first space and a second space. The air passage connects the first space and the second space together. The evacuation port connects the second space to an external environment. The partition has a broader width than the peripheral wall.
1. A method for manufacturing a glass panel unit, the method comprising:
an assembling step including preparing a glass panel unit assembly comprising:
a pair of glass substrates arranged to face each other;
a peripheral wall having a frame shape and disposed between the pair of glass substrates;
a partition provided to partition an internal space, surrounded with the pair of glass substrates and the peripheral wall, into a first space and a second space;
an air passage connecting the first space and the second space together; and
an evacuation port connecting the second space to an external environment, the partition having a broader width than the peripheral wall;
an evacuation step including evacuating the first space through the air passage, the second space and the evacuation port;
a sealing step including deforming the partition to close the air passage, thereby forming a boundary wall that hermetically separates the internal space into the first space and the second space, wherein:
the partition is formed such that the boundary wall is going to have a broader width than the peripheral wall that has gone through the sealing step,
the assembling step further includes:
peripheral wall forming steps of forming the peripheral wall, each including applying a material for the peripheral wall onto one of the pair of glass substrates; and
partition forming steps of forming the partition, each including applying a material for the partition onto one of the pair of glass substrates, and
in the peripheral wall forming steps, materials for the peripheral wall applied by the peripheral wall forming steps are adjacent to one another in a direction defining the width of the peripheral wall,
in the partition forming steps, materials for the partition applied by the partition forming steps are adjacent to one another in a direction defining the width of the partition, and
a number of times of the partition forming steps is greater than a number of times of the peripheral wall forming steps.
2. The method of claim 1 , wherein
in the partition forming steps, an interval between adjacent application lines of the material for the partition is set such that surfaces of the adjacent application lines of the material for the partition are connected together to be level with each other.
3. The method of claim 1 , further comprising a removing step, wherein
the removing step includes removing a part including the second space to obtain a glass panel unit as a part including the first space.
4. The method of claim 3 , wherein
the removing step includes removing the part including the second space by cutting off the pair of glass substrates along a centerline of the boundary wall.
5. The method of claim 1 , wherein
the partition is lower in height than the peripheral wall.
6. The method of claim 5 , wherein
the same core material is dispersed in the material for the partition and the material for the peripheral wall.
7. The method of claim 1 , wherein
the partition and the peripheral wall have the same softening point.
8. The method of claim 7 , wherein
a material for the partition and a material for the peripheral wall are the same.