The new national standard GB/T 11944-2025 for insulated glass units (IGUs), which came into force on July 1, 2026, has imposed stricter full-scale control standards on three core indicators: glass thickness tolerance, lamination offset and sealing air tightness. This article elaborates on the core precision advantages of Shandong Huacheng’s insulated glass pressing equipment.
I. Reinforced Thick Steel Frame Body
Shandong Huacheng applies heavy-gauge steel plates to support the entire pressing plate. No plate warpage or local insufficient stress occurs after long-term repeated pressing, completely eliminating defective issues such as incomplete pressing and poor edge sealing adhesion.
II. Servo Motor Pressing Drive, Machining Precision Far Exceeding National Standard
The pressing power system adopts a combined transmission structure of servo motors, timing belts and ball screws, replacing the conventional rigid reducer connection design. It generates zero transmission clearance caused by long-term wear, keeping the overall pressing error stably within 0.3 mm.
Benchmarking the thickness tolerance requirements specified in GB/T 11944-2025:
- Single-layer IGUs with overall thickness less than 24 mm: permissible tolerance ±1 mm
- Single-layer IGUs with overall thickness over 24 mm: permissible tolerance ±1.5 mm
- Multi-layer and laminated insulated glass: permissible tolerance ±2.5 mm
With ultra-minimal error controlled within 0.3 mm, Huacheng equipment delivers far better performance than the national standard allowable deviation, ensuring consistent and uniform glass thickness in mass production.
III. Servo Synchronous Lifting Mechanism to Strictly Control Lamination Offset within National Standard Limits
The bottom glass lifting unit is equipped with a servo lifting system, which differs greatly from common cylinder lifting systems on the market. Cylinder lifting is susceptible to air pressure fluctuations and poor synchronization among multiple cylinders, leading to height misalignment of two glass panes and excessive lamination offset that fails inspection.
Huacheng’s multi-point synchronous servo lifting maintains identical lifting height at all support points, achieving high alignment of two glass panes during lamination and steadily complying with the national standard’s limit on edge lamination offset for insulated glass.
IV. Special Sealing Matching for Gas Filling Lines to Stably Meet National Standard Argon Concentration Requirements
Multiple optimizations are applied to gas-filling insulated glass production lines to guarantee air tightness: logic valves fitted on suction cups reduce argon consumption; dual built-in gas storage tanks inside the machine pre-store stabilized-pressure argon for balanced and stable internal cavity pressure during filling.
Combined with high-precision plate pressing technology, butyl sealant and secondary sealant fully adhere around the spacer bar without gaps or air leakage, consistently meeting the mandatory gas filling requirements of the 2026 new national standard.
V. High-Density Moisture-Proof Leveling Wood Panels to Secure Long-Term Air Tightness Service Life
High-density moisture-proof boards are adopted as pressing panels, featuring high flatness and resistance to damp deformation. Uniform stress distribution during pressing avoids partial incomplete pressing and cracks in sealing adhesive, effectively preserving long-term air tightness of insulated glass and satisfying the mandatory national standard requirement of a minimum 15-year service life for qualified insulated glass units.
