Manufacturing Technology
Production Processes
Raw Material Preparation
High-purity silica sand (70-74%), soda ash (12-16%), limestone (10-15%) and cullet (recycled glass) are precisely measured and mixed to create batch for melting at 1500-1700°C in regenerative furnaces.
Forming Techniques
Three main methods: Blow-and-blow for narrow-neck containers, press-and-blow for wide-mouth jars, and narrow-neck press-and-blow for precision pharmaceutical bottles using IS machines.
Annealing & Finishing
Bottles undergo controlled cooling in lehr ovens (500-300°C) to relieve internal stresses, followed by surface treatments, quality inspection, and packaging for distribution.
Raw Material Preparation
The foundation of quality glass begins with precise formulation: silica sand provides structural integrity, soda ash lowers melting temperature, limestone adds durability, and cullet (recycled glass) reduces energy consumption. Modern plants use automated batching systems with laser particle analysis to ensure consistent quality and optimal melting characteristics.
Forming Techniques
Modern IS (Individual Section) machines operate with precision timing: gobs of molten glass are cut and delivered to molds, where compressed air forms the parison (preliminary shape), then final blowing creates the bottle. Computer vision systems inspect every bottle for defects, ensuring consistent wall thickness, proper sealing surfaces, and optical clarity.
Annealing & Quality Control
The annealing process gradually cools bottles from 550°C to 60°C over 60-90 minutes in lehr ovens, eliminating thermal stress that could cause spontaneous breakage. Advanced inspection systems use lasers, cameras, and pressure testing to check for cracks, bubbles, wall thickness variations, and dimensional accuracy before bottles proceed to coating, labeling, and packaging.
