Annealing Lehr
Systems.
Precision cooling. Stress-free glass. Advanced annealing lehr systems ensuring controlled cooling, reduced internal stress, and consistent product quality — critical for high-speed glass production lines.
Overview
Controlled Cooling for Perfect Glass
The annealing process is critical to glass quality. Improperly cooled glass retains internal stresses that lead to breakage during handling, filling, and consumer use. A well-designed annealing lehr eliminates these stresses through a precisely controlled temperature profile — heating, soaking, and cooling zones calibrated to your specific glass type and production speed.
Our annealing lehrs are engineered for high-speed production lines — delivering consistent, stress-free glass with minimal energy consumption. From bottle and container lehrs to specialized decorating lehrs and float glass lehrs, each system is designed for its specific application.
Annealing Lehr System
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Our Range
Annealing Lehr Types
Purpose-built lehrs for every glass product type — each optimized for its specific thermal requirements and production speed.
Annealing Lehrs for Bottles & Containers
High-performance lehrs for glass bottle and container production — engineered for maximum throughput with consistent stress removal.
Decorating Lehrs
Specialized lehrs for decorated glassware — ensuring proper curing of decorations while maintaining glass integrity.
Annealing Lehrs for Vials
Precision lehrs for pharmaceutical vial production — meeting stringent quality requirements for medical glass.
Float Glass Lehrs
Large-scale annealing lehrs for float glass production — managing the thermal profile of continuous glass ribbons.
Key Benefits
Why Choose Our Annealing Lehrs
Stress-Free Glass
Precisely controlled temperature profiles ensuring complete stress relief — consistently meeting breakage test requirements.
Multi-Zone Precision
Independent zone control with PID loops for each heating and cooling section — accurate temperature management throughout.
Energy Efficient
Optimized insulation, heat recovery, and efficient heating systems minimizing energy consumption per ton of glass processed.
High-Speed Compatible
Designed for modern high-speed glass production lines — no bottleneck at the annealing stage.
Advanced Controls
PLC-based control with SCADA visualization, temperature profiling, and recipe management for different glass types.
Long Service Life
Robust construction with quality refractories and heating elements — designed for years of continuous operation.
FAQs
Annealing Lehr FAQ
What is the purpose of annealing in glass manufacturing?
Annealing removes internal stresses in glass that develop during forming. Without proper annealing, glass products are weak, prone to spontaneous breakage, and unsuitable for filling, handling, or consumer use. The lehr provides a controlled cooling profile that gradually relieves these stresses.
What heating methods do your lehrs use?
We offer both electric and gas-fired heating systems. Electric heating provides precise, clean temperature control. Gas-fired systems offer lower operating costs for high-throughput applications. Selection depends on energy availability, cost, and production requirements.
How many temperature zones are typical?
The number of zones depends on lehr length, glass type, and required temperature profile. Typical bottle lehrs have 6-12+ independently controlled zones — heating, soaking, and multiple cooling stages. Each zone has independent PID control for precise temperature management.
Can your lehrs handle different glass types?
Yes. Our control systems support recipe management — storing temperature profiles for different glass types, colors, and container sizes. Operators can switch between recipes for production changeovers.
What conveyor types are used in your lehrs?
We use mesh belt conveyors (most common for containers), roller conveyors (for flat glass), and modular chain systems — selected based on product type, weight, and operating temperature requirements.
Need an Annealing Lehr System?
Share your glass type, production speed, and quality requirements — our thermal engineering team will design a lehr optimized for your specific application.
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