How does the coating on the surface of the preform affect the heating effect of the infrared heating lamp?
Effect of reflective coating
Solution: If a reflective coating must be used, the power and exposure time of the infrared heating lamp may need to be adjusted to compensate for the energy loss caused by reflection. Or find an infrared heating lamp with a specific wavelength that can penetrate the reflective coating so that the energy can be transferred through the coating to the plastic material inside the preform.
Effect of absorptive coating
Solution: When using an absorptive coating, be careful to avoid excessive absorption and local overheating. The power of the heating lamp and the heating time of the preform need to be precisely controlled, because the coating may cause the preform to absorb heat faster than expected. At the same time, consider the stability of the coating at high temperatures to ensure that the coating does not decompose or react chemically during the heating process, affecting the quality of the preform.
Effect of thermal insulation coating
Solution: For preforms with thermal insulation coatings, the heating time can be appropriately extended or the power of the heating lamp can be increased to ensure that the heat can fully penetrate the coating and reach the inside of the preform. At the same time, the thermal properties of the coating should be studied and the heating parameters should be optimized so that the preform can reach a uniform blowing temperature within the appropriate time.
