NTRY Infrared Heating Vertical Glass Fiber Impregnation Line

Radiant Heating Oven – Overview

The radiant heating oven is a key piece of equipment for drying and curing pre-impregnated sheets (PP). It can be heated by hot oil or electricity and provides either conventional or far-infrared radiation. Far-infrared waves are particularly effective for epoxy resin, as the energy is absorbed directly by the resin molecules, promoting solvent evaporation and uniform curing while minimizing bubbles and surface defects.

Schematic：

Design & Operation:

• Modular design: The oven consists of multiple sections, with a height typically between 5 and 15 meters, depending on the fabric thickness and production speed.
• Separate upward and downward sections: The upward section gradually removes solvents, while the downward section completes curing. Temperatures for each section can be independently controlled.
• Radiant panels are installed on both sides of the fabric path, with adjustable distances (70–200 mm) to optimize heating for wet or dry states.
• “Air-seal” sections (air curtains) at both ends prevent solvent-laden exhaust from escaping, ensuring a safer and cleaner working environment.

Advantages:

• Provides smooth surface finish and uniform drying; suitable for thick or high-performance substrates.
• Temperature zones can be adjusted to ensure consistent curing across left, center, and right areas of the fabric.
• Far-infrared heating directly energizes the resin, improving solvent evaporation and crosslinking efficiency.
• Equipped with staged cooling sections to gradually cool the sheets, preventing sudden thermal contraction that can affect size stability and flatness.

Maintenance Tips:

• Regular cleaning of radiant panels, cooling air nozzles, and fresh air filters is necessary to avoid contamination or black spots on the sheets.
• Air ducts and fans should be cleaned annually to remove resin buildup, which can disrupt airflow and pose a fire hazard.