I. Core Technical Principles Infrared radiation heating mechanism High-power infrared tubes (such as Philips 13169X series, 500W/120V) are adopted to achieve rapid surface heating by matching the wavelength with the absorption characteristics of PET molecules (900-1200nm). During the heating process, air circulates within the furnace (in coordination with the fan) to ensure uniform temperature and prevent the problem of overheating on the outer wall of the preform and insufficient temperature on the inner wall. The typical heating zone is divided into 6 to 8 independent temperature control sections, with each section's temperature adjustable (such as 120℃±5℃), to meet the heating requirements of different preform weights (such as 5-50g) and thicknesses (≤4.5mm). Precise temperature control and energy distribution The intelligent temperature control system, in combination with an infrared thermometer, can adjust the power of the lamp tube in real time (such as thyristor phase control), achieving dynamic optimization of the preform temperature curve. For instance, Sidel's EvoBLOW Laser technology employs 36 laser heating wires to replace the traditional 8-zone halogen lamp, achieving precise control of material thickness and supporting lightweight design below the bottleneck.
Ii. Key Technical Parameters and Performance Indicators Power and energy consumption: The power range of a single lamp tube is 300-1200W, the voltage compatibility is 120-240V, the color temperature is 2500-2700K, and the lifespan is over 5000 hours. After optimizing the overall energy consumption of the machine, it saves 20% to 30% energy compared with traditional halogen lamps. Heating efficiency: It only takes a few seconds for the preform to rise from room temperature to the glass transition temperature (90-120℃). Combined with the stretch blow molding process (radial stretch ratio 3.5-4.2, axial stretch ratio 2.8-3.1), it ensures the mechanical strength of the bottle wall (tensile strength increases by more than 30%). Environmental adaptability: Laser heating technologies (such as EvoBLOW) are not affected by fluctuations in environmental temperature, do not require preheating/cooling waiting, support 24-hour continuous production, and have zero quality fluctuations after shutdown and restart.
