Glass sheet preparation
1.Cutting: Cut flat glass sheets to the required size and grind the edges (e.g., chamfer) to avoid stress concentration.
Cleaning: Clean the glass surface with deionized water and a brush to remove oil, dust, and other impurities to ensure subsequent bonding effectiveness.
2.Spacer bar (aluminum frame) production
Material selection: Aluminum alloy spacer bars are typically used, filled with desiccant (such as molecular sieves) to absorb moisture in the hollow layer.
Bending/cutting: The spacer bars are bent into rectangular frames according to the glass dimensions, or cut and connected into frames using corner brackets
3. Assembling hollow structures
Laminating: Combine two pieces of glass with spacer bars to form a hollow layer (thickness is generally 6 mm, 9 mm, 12 mm, etc.).
Primary sealing (butyl rubber): Apply hot-melt butyl rubber to the contact surface between the spacer bar and the glass to prevent gas leakage and preliminarily fix the structure.
4. Secondary sealing
Structural adhesive sealing: Apply polysulfide adhesive or silicone adhesive to the edges of the glass to enhance structural strength and airtightness. The double-seal process (butyl adhesive + structural adhesive) is the industry standard.
5. Filling gas (optional)
Inert gas filling: Argon (Ar), krypton (Kr), and other inert gases are filled into the hollow layer through small holes in the spacer bar to improve thermal insulation and soundproofing performance. After completion, the small holes are sealed.
6. Curing and Quality Inspection
Curing: Allow the sealant to cure completely by leaving it undisturbed (curing time varies depending on the type of sealant).
Quality Inspection: Inspect for airtightness (e.g., dew point test), appearance, and thickness of the hollow layer to ensure there are no air leaks or impurities.
7. Packaging and transportation
Protective film is applied to the edges of the finished product to prevent scratches during transportation, and a “hollow glass” label is affixed.
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