How to judge whether the infrared heating lamp is suitable for the blow molding machine?
Heating performance
Temperature uniformity:
For the blow molding machine, the preform needs to be heated evenly to ensure the quality of the bottle. An infrared thermal imager can be used to detect the temperature distribution of the preform after the heating lamp heats the preform. A suitable infrared heat replacement heating element should be able to control the temperature difference of the preform in the circumferential and axial directions within a small range, and the ideal temperature difference is generally not more than ±5℃. For example, during the inspection process, the temperature should be relatively uniform from the bottom to the top of the preform and at various points around the circumference. If the temperature difference is too large, it may cause uneven wall thickness of the bottle, affecting the physical properties and appearance of the bottle.
It is also important to observe the actual performance of the preform during the heating process. During the heating process, the surface of the preform should not be discolored or deformed due to local overheating. For example, if the local temperature of the PET preform is too high, it will turn yellow, which means that the heating performance of the halogen infrared quartz heating lamp may not be suitable and needs to be reselected or adjusted.
Heating speed:
It must meet the production speed requirements of the blow molding machine. If the blow molding machine has a high production speed, such as producing more than 60 bottles per minute, the infrared heat lamp for beverage bottle industry should be able to heat the preform to the appropriate blowing temperature in a short time (usually a few seconds to more than ten seconds). Whether the heating speed meets the requirements can be determined through actual testing. For example, for PET preforms, the appropriate blowing temperature is between 100-180℃. Within the specified heating time (such as 10 seconds), if the Ir Heat Lamp for Blow Machine can stabilize the preform temperature to this range, it means that its heating speed is appropriate.
Compared with other halogen bulb infrared quartz heating of the same type and power, it can also be judged whether its heating speed has an advantage. If a infrared tungsten heat lamp can heat the preform to the target temperature faster than other Shortwave Clear Infrared Halogen Lamps under the same power and distance conditions, then it may be more suitable for the needs of the blow molding machine in terms of heating speed.
