• Categories:IR Heating Applications
• Author:E-DEN Lighting
• Origin:E-DEN IR Lighting
• Time of issue:2025-07-22
• Views:0

(Summary description)PET film, valued for its excellent properties, is widely used in packaging, printing, and numerous other fields. When PET film is used for printing, ink drying is a critical step to ensure print quality. Traditional drying methods exhibit certain limitations regarding efficiency, energy consumption, and their impact on film quality. Quartz infrared heating lamps, as highly efficient heating elements, are increasingly demonstrating their advantages in the field of PET film ink drying.

 

PET film is thin and temperature-sensitive. During the ink drying process, it is essential to rapidly and effectively remove solvents from the ink to achieve curing, ensuring the clarity and adhesion of the printed pattern. Simultaneously, temperature must be strictly controlled to prevent PET film deformation, shrinkage, or other quality issues caused by overheating.

 

Advantages of Quartz Infrared Heating lamps in PET Film Ink Drying

 

High Efficiency & Rapid Drying:
The rapid heat-up characteristic of quartz infrared heating lamps, especially short-wave infrared lamps, enables the rapid evaporation of solvents within the ink, significantly reducing drying time. Compared to traditional heating methods, drying efficiency can be increased severalfold, meeting the demand for high productivity in large-scale operations. For instance, in high-speed printing lines, quartz infrared heating lamps can achieve virtually instantaneous drying of ink on PET film, enabling continuous, high-speed printing production.

 

 

Precise Temperature Control:
Based on the material properties of the PET film and the drying requirements of the ink, the heating temperature can be precisely regulated by controlling the output power of the infrared heater. Utilizing an accompanying temperature control system, temperature fluctuations can be minimized, preventing adverse effects on PET film and ink quality caused by excessive or insufficient temperatures. This is crucial for ensuring consistent print quality and effectively reducing defect rates.

 

 

Energy Saving & Reduced Consumption:
Quartz infrared heating lamps offer high electrical-to-radiant energy conversion efficiency. Gold-coated infrared lamps can increase infrared radiation efficiency up to 95%, converting more electrical energy into effective heat during the heating process and minimizing energy loss. Compared to traditional heating equipment, using quartz infrared heating lamps for PET film ink drying results in substantial energy savings, lowering production costs.

 

 

Minimal Impact on PET Film Quality:
Due to their uniform heating distribution and precise temperature control, quartz infrared heating lamps minimize problems like deformation and shrinkage caused by uneven heating during the drying process. This preserves the original physical properties and appearance quality of the PET film.

 

Optimizing Quartz IR lamp Selection for PET Film Ink Drying

By thoroughly understanding the heat deflection temperature of PET film and the required ink drying temperature, quartz heating lamps with varying power outputs can be designed to meet the rapid drying needs for films of different widths and colors. Matching the specific production requirements with quartz infrared heating lamps of different wavelengths – such as short-wave, fast medium-wave, or standard medium-wave lamps – is essential.

 

PET Film Thermal Properties: Conventional PET film has a glass transition temperature (Tg) around 70°C to 80°C. Exceeding this range causes gradual softening; increasing temperature further leads to reduced mechanical strength and significant deformation. However, biaxially oriented PET film (BOPET) exhibits significantly enhanced mechanical properties, with a heat deflection temperature reaching 180°C to 200°C. Within this range, the film maintains good dimensional stability and physical properties.

 

 

Selection Guide: For films with deformation temperatures around 70°C to 80°C, medium-wave heating lamps are suitable. For films with heat deflection temperatures of 180°C to 200°C, short-wave heating lamps can be used.

 

 

Ink Drying Requirements: Ink drying temperature is closely related to ink type.

 

 

Solvent-based inks contain high levels of organic solvents. Drying requires complete solvent evaporation, typically at 60°C to 80°C. However, precise temperature adjustment is needed based on the boiling points of the specific solvents used.

 

 

Water-based inks use water as the primary solvent. Drying involves both water evaporation and the curing of resins and other film-forming components. Temperatures are generally higher (80°C to 120°C), and specific drying time requirements exist.

 

 

UV-curable inks rely on ultraviolet light to initiate photopolymerization for curing and do not inherently require high-temperature drying. Only moderate pre-heating of the PET film (approx. 40°C to 60°C) is needed before printing to remove surface moisture and enhance ink adhesion.