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Low Temperature Continuous Tunnel Furnaces for Thin Film Products - China Suppliers and Factory Solutions

Tunnel furnaces designed for thin film production in China must utilize corrosion-resistant materials and advanced heating methods while ensuring precise temperature control and environmentally friendly features. These furnaces are essential for meeting industry demands for high throughput, superior quality, and environmental sustainability. When selecting a model, it is crucial to consider the user’s production requirements, budget constraints, and the technical capabilities of suppliers. Key aspects to focus on include the materials used, heating methods, accuracy in temperature control, environmental protection features, and the quality of after-sales service. Looking ahead, energy conservation, standardization, and environmental upgrades are set to be significant trends in factories across the industry
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    Technical Parameters

    Structure and Operation Principle

    1. Core Structure

    Furnace

    Constructed of high-temperature-resistant stainless steel (such as SUS310S) or welded carbon steel, with internal insulation panels (such as ceramic fiber modules) and air distribution plates. Air inlets and temperature control devices are located at the top and bottom, and heating devices (electric, gas, or steam) are installed on the side walls. Air outlets and exhaust devices are located at both ends.

    Conveyor

    • Teflon mesh belt: High-temperature resistant (above 250°C), anti-stick, and wear-resistant, suitable for materials prone to adhesion, such as films.
    • Stainless steel mesh belt: Made of 304/310S, high-temperature and corrosion-resistant, suitable for high-temperature environments.

    Heating System

    • Electric heating: Infrared heating tubes or resistance wires provide fast heating and uniform temperature, suitable for high-precision requirements.
    • Gas heating: Low cost, but requires exhaust gas treatment facilities such as dust collectors, desulfurization and denitrification equipment.
    • Steam heating: Requires boiler support, has a moderate cost, and is suitable for companies with a steam source.

    Temperature Control System

    • Sensor: Thermocouples or infrared thermometers monitor temperature in real time.
    • Control Algorithm: PID control combined with fuzzy control dynamically adjusts heating power and conveyor speed.
    • Execution Layer: Temperature stability is achieved by adjusting steam flow, fan speed, or gas valves.

    2. Workflow

    The film enters the oven via a conveyor belt. The heating system generates hot air or radiant heat, which exchanges heat and moisture with the film, evaporating moisture. An exhaust device removes moisture. Some designs use fans to accelerate air flow, improving drying efficiency. The cooling section uses natural cooling or fans to reduce temperature, ensuring that the film meets winding requirements after exiting the oven.

    Frequently Asked Questions

    What materials are used in the construction of the furnace?

    The furnace is constructed using high-temperature-resistant stainless steel (such as SUS310S) or welded carbon steel. It includes internal insulation panels like ceramic fiber modules and air distribution plates to ensure optimal heat retention and distribution.

    What are the differences between Teflon and Stainless Steel conveyor belts?

    Teflon mesh belts are heat-resistant (above 250°C), anti-stick, and wear-resistant, making them ideal for materials prone to adhesion like films. Stainless steel mesh belts (made of 304/310S) offer superior corrosion and high-temperature resistance for more demanding environments.

    What heating options are available for the system?

    There are three main options: Electric heating (infrared tubes or resistance wires for fast, uniform heat), Gas heating (cost-effective but requires exhaust treatment like dust collectors), and Steam heating (moderate cost, suitable for facilities with an existing steam source).

    How does the temperature control system maintain stability?

    The system utilizes sensors (thermocouples or infrared thermometers) for real-time monitoring. A PID control algorithm combined with fuzzy control dynamically adjusts heating power and conveyor speed, while the execution layer modulates steam flow, fan speed, or gas valves.

    How does the drying workflow operate?

    The film is conveyed into the oven where hot air or radiant heat evaporates its moisture. An exhaust device removes the moisture, and optional fans accelerate the airflow. Finally, a cooling section reduces the film's temperature so it is ready for winding upon exit.