From Furnace to Annealing: How is a Perfect Glass Bottle Born? (Taking the Bordeaux Bottle as an Example)
2026-04-15
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A classic 750ml Bordeaux bottle undergoes five sophisticated processes — batching, melting, forming, annealing and inspection — from raw sand to finished product. Our factory integrates advanced modern equipment to balance large-scale production and high-quality output.
1. Batching: Precise Proportioning for Solid Quality Foundation
The main raw materials include quartz sand, soda ash and limestone, mixed with cullet to reduce energy consumption. Colorants such as chromium oxide and iron oxide are added to create the iconic dark green of Bordeaux bottles. After crushing, screening and iron removal, all materials are automatically weighed and blended with a precision of ±0.1% to form homogeneous batches, laying a solid foundation for subsequent melting.
2. Melting: High-temperature Refining Turns Raw Materials into Molten Glass
Raw batches are fed into energy-efficient furnaces at 1200-1580℃ and melted for 12 hours. Through melting, refining and homogenization, bubble-free and well-proportioned molten glass is produced. Equipped with 11 high-efficiency furnaces, our factory achieves precise temperature control to guarantee qualified viscosity and purity of molten glass.
3. Forming: Mechanical Blowing Restores Classic Bottle Shape
Molten glass is cut into 350g gobs through the feeder and then delivered to the IS Machine. Adopting the two-step process of initial blowing and final blowing, it perfectly reproduces the classic contour of Bordeaux bottles with high shoulders, straight body and narrow mouth. One 8-section IS machine can produce hundreds of bottles per minute, with dimensional errors controlled within ±1.5%.
4. Annealing: Relieve Internal Stress to Prevent Breakage
Newly formed glass bottles reach up to 600℃. Rapid cooling will cause severe internal stress due to temperature difference between inside and outside, leading to easy breakage during filling, transportation and use.
Our gradient-temperature annealing furnace keeps bottles warm at 580℃ first to relax glass molecules and release stress, then cools down slowly to room temperature at a rate of 1-2℃ per minute. This process completely eliminates internal stress and improves compression resistance. Annealing is the core process of glass durability; unannealed glass is only one-third as strong as qualified products.
5. Inspection: Three-level Quality Control for Qualified Delivery
We combine automatic inspection machines with manual rechecks. Visual inspection detects bubbles, cracks and surface defects; physical testing checks mouth flatness (tolerance ≤0.1mm) and impact resistance; chemical testing strictly controls heavy metal precipitation to fully comply with food-grade safety standards.
From raw sand to finished high-quality Bordeaux bottles, Cheer relies on modern equipment and rigorous craftsmanship to control every production link, delivering glass bottles with both exquisite appearance and excellent durability.
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