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Why Is Temperature Control Important for Float Glass Production?

Views: 25     Author: Site Editor     Publish Time: 2023-12-08      Origin: Site

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This article explains why temperature control is so important to float glass production line from three aspects: the float glass production process involving temperature control, the impact of temperature on float glass in float glass production, and the impact of temperature control on energy consumption and the environment.

Which processes in float glass production involve temperature control?

Temperature control is a critical aspect at various stages of float glass production to ensure the quality and efficiency of the manufacturing process. The key processes involving temperature control in float glass production include:

1. Raw Material Melting

In the initial stages of float glass production, raw materials such as silica, soda ash, limestone, and other additives are introduced into the melting furnace at a temperature of 1,500°C or higher. Here, the raw materials flow as molten glass. Precise temperature control is essential to initiate and sustain the melting process, allowing the raw materials to fuse into a molten glass state.

2. Refining Furnace

The molten glass from the melting furnace enters a refining process where it is cooled to a temperature of approximately 1,100–1,300°C, and air bubbles are eliminated. This stage ensures the glass attains the desired composition and quality through meticulous temperature control.

3. Tin Bath

At this stage, the molten glass at 1,100°C flows gently over a refractory and is spread evenly over the surface of the molten tin.

Temperature control is crucial during the forming process to maintain the desired viscosity of the glass, facilitating uniform thickness and surface smoothness. The molten glass is smoothly and uniformly molded to the shape of the surface of the molten tin and leaves the float bath as a solid ribbon at 600°C.

4. Annealing

Following the tin bath, the glass ribbon undergoes controlled cooling in an annealing lehr to relieve internal stresses and enhance its structural integrity. Proper temperature control during annealing is vital to prevent thermal stresses that could compromise the glass quality.

5. Furnace Operation

The operation of the furnace itself requires meticulous temperature control. Maintaining the furnace at the optimum temperature is essential for the continuous melting of raw materials and the overall efficiency of the glass production process.

6. Cooling Process

The controlled cooling of the glass ribbon after forming is crucial to achieving the desired properties. Proper temperature control during the cooling phase helps prevent thermal stresses and ensures the final product meets the required standards.

From the initial melting of raw materials to the final cooling process, maintaining precise temperatures is integral to ensuring the overall success of the float glass manufacturing process.

Effects of temperature variations on float glass

Viscosity Control

Viscosity is a crucial factor in float glass production as it determines the flow behavior of the molten glass. The temperature of the molten glass directly influences its viscosity.

As temperature increases, the viscosity of the glass decreases. If the viscosity is too high, it can lead to difficulties in the glass forming process. The molten glass may not flow smoothly and evenly across the surface, resulting in uneven thickness and surface defects in the final product.

On the other hand, if the viscosity is too low, the glass may spread too rapidly, causing problems such as excessive thinning and the formation of waves or ripples on the glass surface. This can compromise the quality and uniformity of the float glass.

Color Control

The color of float glass is strongly influenced by the temperature at which it is processed. Different metal oxides present in the raw materials used for glass production impart specific colors to the glass.

Controlling the temperature during the melting and forming processes is essential for achieving the desired color in the final product. Higher temperatures can intensify certain colors, while lower temperatures may result in a more subdued coloration.

Precise temperature control is crucial for achieving consistent and reproducible color in float glass production. Variations in temperature can lead to color inconsistencies, making it challenging to meet quality standards and customer expectations.

Glass Properties

Strength: Temperature control is vital for ensuring the proper annealing of float glass. Annealing involves controlled cooling of the glass to relieve internal stresses. Inadequate temperature control during annealing can lead to uneven stress distribution, compromising the strength of the glass.

Durability: Proper temperature control contributes to the uniform composition of the glass, preventing the formation of defects that could compromise its durability. Additionally, controlled cooling rates during production contribute to the overall structural integrity of the glass.

Transparency: Temperature affects the homogeneity of the glass melt, influencing its optical properties. Consistent temperature control ensures a uniform composition, minimizing the presence of impurities and enhancing the transparency of the float glass.

Chemical Resistance: Temperature control during the melting and forming processes is crucial for maintaining the chemical stability of the glass. Deviations in temperature can lead to changes in the glass composition, affecting its resistance to chemical reactions and environmental factors.

Impact of temperature control in float glass production on energy consumption and the environment

In addition to the float glass itself, temperature control in float glass production also has an impact on energy consumption and the environment.

Energy consumption

Regarding energy consumption, proper control is pivotal in the melting furnace, where it is crucial for efficiently melting raw materials and reducing the energy required for the process. Similarly, in the float bath, precise temperature control impacts the cooling and solidification of glass, ensuring uniform thickness and minimizing the need for additional energy-intensive processing steps.

Accurate temperature control in the annealing oven optimizes energy consumption by facilitating a gradual and efficient cooling process. This efficiency is further enhanced through temperature optimization at various production stages and the integration of heat recovery systems.


In terms of environmental impact, optimized combustion in the melting furnace, facilitated by proper temperature control, reduces the emission of pollutants associated with incomplete combustion. The use of energy-efficient equipment, supported by precise temperature control, further minimizes the environmental impact associated with energy consumption.

Additionally, accurate temperature control contributes to resource conservation by facilitating precise batch formulation, ensuring efficient use of raw materials and minimizing waste. Stable temperatures throughout the production process enhance process stability, reducing errors and the subsequent waste of resources.

Furthermore, adherence to emission standards through proper temperature control supports cleaner and more sustainable production practices, aligning with regulatory compliance.

About us - Professional float glass production line manufacturer

Nanjing Baisheng Glass Technology Co., Ltd. is a leading global glass technology equipment engineering system integration service provider, with its headquarters situated in the Airport Science & Technology Industrial Park, Lishui District, Nanjing. Established in 2007, the company has been committed to providing comprehensive "one-stop" system integration services encompassing glass engineering R&D, construction, equipment manufacturing, commissioning, and production operations.

Over the past 15 years, Baisheng has accumulated advanced technology and extensive experience in constructing glass factories, cold and hot repairs of melting furnaces, furnace heat-up, and equipment manufacturing for glass production lines. The company holds patented technologies and proprietary knowledge in areas such as photovoltaic calendered glass, small and medium float energy-saving glass, water glass, light industrial energy-saving glass, and all oxygen and electric boosting glass furnaces.

Baisheng's technological prowess, reliable service, and positive reputation have garnered a prestigious client base, including international glass industry leaders such as Signify, Arc, Schott, Taiwan Glass, and Saint Gobain. Domestically, important clients include Sinoma, China Glass, Shandong Jinghua, Jiangxi Black Cat, Hubei Yijun, Jiangsu Solat, and Tangshan Jinxin. The company focuses on developing and maintaining relationships with key target customers in "One Belt, One Road" countries, including Thailand, Vietnam, Indonesia, India, Pakistan, Egypt, Uzbekistan, Kazakhstan, and Bangladesh.

Baisheng's unwavering pursuit is to become the most valuable service provider in the glass industry, leveraging its strong technical force and commitment to delivering high-quality services. Importantly, Baisheng is recognized as a notable float glass production line manufacturer, further solidifying our position in the industry.

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