Toughened Glass Processing Issues

FT Glass processing

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Problems and solutions of toughened glass during the process

Glass is becoming more and more popular in the construction field, ranging from indoor desktops, fish tanks, and shelves to residential glass doors and windows, commercial glass guardrails, elevator handrails, exterior glass curtain walls, and so on. Glass is playing a more and more critical role.

 In addition to the stunning appearance of glass, its relatively low prices, fashion, easy installation, and other features have become the first choice for more and more designers and homeowners when choosing decoration materials. However, all products cannot be flawless, and tempered glass is no exception.

 As well as the spontaneous breakage of toughened glass, the problems in the processing process will also lead to an increase in the glass breaking rate in the later stage, which will bring inconvenience and even potential danger.

 In the following article, we will explain to you the problems that may happen in the processing of toughened glass and the corresponding solutions.

Curve

a. Upward or downward curve

Problem A: The top surface temperature is too high while the down surface temperature is too low; top surface temperature is also chill while the top surface temperature is too high

Solution A: Lower the top surface temperature or increase the down surface temperature; increase the top surface temperature or decrease the down surface temperature

Problem B: The upper surface wind pressure is too small, or the downward surface wind pressure is too big; the up surface wind pressure is too big, or the downward surface wind pressure is too small.

Solution B: Increase the top surface wind pressure or decrease the down surface wind pressure; reduce the up surface wind pressure or increase the down surface wind pressure

Remarks: For glass thickness <8mm, adjust wind pressure; for glass thickness>10mm, adjust the temperature.

b. S-shape curve

Problem: Heating time is too long, or inside temperature is too high

Solution: Shorten the heating time or decrease inside temperature

c. Saddle-type curve

Issue: Inside temperature of the glass central is too high, which usually leads to a big arc on the glass surface

Solution: Lower the furnace temperature by ten and multiple degrees or increase the heating time

d. Irregular curve

Problem A: Debris or dirt on the tempering furnace grid

Solution A: Wipe the debris or dirt off the grid

Problem B: Unevenness of the grid roller

Solution B: Adjust the grid roller

Breakage

Breakage inside the furnace

Damage happens in a short time

Problem A: Disequilibrium when eliminating the glass surface stress

Solution A: Decrease the furnace temperature or extend the heating time; polish all the edges

Problem B: Holes and notches not processed according to the proper method

Solution B: Cut the holes and notches strictly following the standard technique

Problem A: Defectives like stones, bubbles, and content in float glass

Solution B: Change to quality float glass substrates

Problem A: Glass residue stuck on the furnace roller

Solution B: Keep the furnace roller clean and tidy

Breakage happens after half process of tempering

Problem A: Holes and notches not processed according to the proper method

Solution A: Cut the holes and notches strictly following the standard technique; prolong the heating time

Problem B: Some damage occurs on the glass substrates

Solution B: Inspect the glass substrates before tempering

Breakage happens when quenching

Spiral-shape breakage

Problem: Insufficient heating time or temperature

Solution: Prolong heating time or increase heating temperature

Fracture from the holes or the notches

Problem: Holes and notches not processed according to the proper method

Solution: Cut the holes and notches strictly following the standard technique

Broken into fragments or ruptured thoroughly

Problem: Inferior edge process; glass residue in the tempering grids

Solution: Do the polish edge; clean all residue off the grids

Glass Spots

Spread on the glass surface irregularly

Problem A: Heating temperature is too high

Solution A: Decrease the heating temperature or reduce the heating time

Problem B: Glass residue or debris on the roller

Solution B: Clean the furnace roller thoroughly

Many spots close to the edge and fewer spots in the middle

Problem A: Poor edge processing quality

Solution A: Polish all edges

Problem B: Irregularities of the furnace roller

Solution B: Adjust the roller evenly and smoothly

White intensity

White intensity spread on the glass in the middle part in the longitudinal direction

Problem A: Dirt or residue on the furnace roller

Solution A: Inflate sulfur dioxide gas into the furnace

Problem B: Excessive temperature in the furnace

Solution B: Decrease the temperature or launch the heating balancer

Coating film peeling

 Sectional film peeling on coating glass

Problem A: Reversed coating side; the excessive heat of upside

Solution A: Coating side towards upside; decrease the furnace temperature

Problem B: Poor quality of glass coating

Solution B: Adopts quality coating glass from a prominent manufacturer

Above all, the experience of operating the furnace is very crucial. Different equipment has different parameters, so we cannot generalize it. Only by figuring out the characteristics of the machine can we make better-toughened glass.

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