An arrangement for producing vacuum insulated glazing (VIG) unit and an evacuation cup suitable for such use as well as a method therefore is presented so as to provide a more uniform or homogeneous heating of the part of the glass pane containing the evacuation hole and possibly a soldering material arranged around the evacuation hole, in particular for the reason of preventing larger temperature gradients in the glass pane between the part covered by the evacuation cup and the remaining part and for avoiding excessive locale temperatures of the glass pane under the evacuation cup, which may be harmful the durability of the glass pane, in particular when the glass pane is made from tempered glass, where the tempering of the glass may be influenced by excessive temperatures.

A glass panel unit according to an example of the present disclosure includes a first glass panel and a second glass panel disposed to face the first glass panel. The glass panel unit includes: a seal having frame shape and hermetically binding the first glass panel and the second glass panel together; and a depressurized space surrounded by the first glass panel, the second glass panel, and the seal. The glass panel unit includes spacers between the first glass panel and the second glass panel. The spacers include a macromolecular resin material including molecular chains. Of the molecular chains, the number of molecular chains oriented in an orthogonal direction is larger than the number of molecular chains oriented in a counter direction. The orthogonal direction is a direction orthogonal to the counter direction, which is a direction in which the first and second glass panels face each other.

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 of the first panel and the second panel extending along edges thereof, and bonded to the peripheral portions; and at least one spacer provided in a vacuum space between the first panel and the second panel. The at least one spacer containing a polyimide, where the polyimide has an absorption edge at which an absorption index decreases in an optical absorption spectrum ranging from an ultraviolet ray to visible radiation, the absorption edge being equal to or less than 400 nm, and the polyimide includes at least one selected from the group consisting of a fluorine group and a chlorine group.

A glass panel unit includes a first pane of glass, and a second pane of glass facing the first pane of glass with both of them spaced a predetermined interval apart. It is provided with a sealant between the panes of glass, joined to them in an airtight manner, and an interior space sealed with them and the sealant. It is provided with a first spacer in the interior space so as to be in contact with the panes of glass, and a second spacer disposed in the interior space so as to be in contact with only one of the panes of glass and out of contact with another thereof.

A glass panel unit includes a first panel, a second panel, a frame body and a reduced pressure space. The reduced pressure space is surrounded with the first panel, the second panel and the frame body other than an exhaust path capable of exhausting gas to an outside, and sealed in a reduced pressure state. In a state where the inner space has been formed, the seal includes a protruding portion positioned outside of edges of a first surface of a first substrate and a second surface of a second substrate. The protruding portion has a length, along the thickness directions of the first substrate and the second substrate, longer than a prescribed interval.

A manufacturing method of a glass panel unit of the present invention includes a bonding step, a pressure reduction step, and a sealing step. In the bonding step, a first substrate and a second substrate are hermetically bonded together with a seal having a frame shape. In the pressure reduction step, a pressure in an inside space formed between the first substrate and the second substrate is reduced through an exhaust port. In the sealing step, sealant disposed between the first substrate and the second substrate is deformed, and the sealant thus deformed seals an opening of the exhaust port.

A compressible pillar is disclosed for the preparation of a vacuum insulated glazing (VIG) unit, having a longitudinal extent in a longitudinal direction when in an uncompressed state, and comprising: a deformable part comprising an open structure, wherein the open structure at least partially collapses under a compression force acting in the longitudinal direction of the compressible pillar, the compression force being of at least one value selected within the range of 60 N to 320 N such as a value of the compression force being selected from the range of 60 N to 140 N, from the range of 140 N to 230 N, or from the range of 230 N to 320 N, wherein the longitudinal extent of the compressible pillar decreases to a compressed longitudinal extent when the compressible pillar is subjected to the compression force, and wherein the compressed longitudinal extent of the compressible pillar increases to an expanded longitudinal extent when the compression force is released, wherein the increase in the longitudinal extent is less than the decrease in the longitudinal extent. Furthermore is disclosed a process of manufacturing a compressible pillar, a method of producing a vacuum insulated glazing unit by the use of such pillars and a vacuum insulated glazing unit comprising such pillars.

A method for manufacturing a glass panel unit includes an assembling step, a bonding step, a gas exhausting step, a sealing step, and an activating step. The bonding step includes melting a peripheral wall in a baking furnace at a first predetermined temperature to hermetically bond a first glass pane and a second glass pane together with the peripheral wall thus melted. The gas exhausting step includes exhausting a gas from an internal space through an exhaust port in the baking furnace to turn the internal space into a vacuum space. The sealing step includes locally heating to a temperature higher than a second predetermined temperature, and thereby melting, either a port sealing material or an exhaust pipe to seal the exhaust port and thereby obtain a work in progress. The activating step includes activating a gas adsorbent after the sealing step to obtain a glass panel unit.

Disclosed herein is 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. The at least one spacer contains a polyimide. The polyimide has an absorption edge at which an absorption index decreases in an optical absorption spectrum ranging from an ultraviolet ray to visible radiation. The absorption edge is equal to or less than 400 nm.

The present disclosure relates to a vacuum insulated glazing unit, to the use thereof and to a method of manufacturing such a unit. The vacuum insulated glazing comprises a first glass pane, having a first interior major surface and a first exterior major surface and a second glass pane having a second interior major surface and second exterior major surface, the glass panes being arranged in parallel with said interior major surfaces facing each other. The VIG unit further comprises a low emissivity coating deposited on at least the first interior major surface, an edge region in proximity to the edge of the first glass pane, defined as where none or a reduced part of the low emissivity coating is present, and a side seal comprising a glassy seal material arranged at a minimum separation distance (d1_min) from said low emissivity coating, so that an intermediate part of said edge region between said glassy sealing material and said low emissivity coating is not bonded to said glassy sealing material, or a side seal arranged at a minimum separation distance (d1_min) of at least 1.5 mm, such as at least 2 mm, or such as at least 3 mm from said low emissivity coating.