Infrared heating lamps are mainly used in the following ways to achieve temperature control in blow molding machines:Power regulation:Power setting under normal working conditions: When the blow molding machine is operating normally and continuously processing preforms, the Shortwave Infrared Quartz Heat Lamp work at the preset normal power to provide enough heat for the preforms to reach a temperature suitable for blowing. For example, for common plastic preform materials, such as PET, the power of the shortwave emitter will be set according to factors such as the size and thickness of the preforms and the requirements of the blowing process to ensure that the preforms can be heated and softened evenly.Power adjustment in standby mode: When the blow molding machine suspends the embryo operation for various reasons, if the halogen heat lamp continue to work at normal power, the temperature of the heating head will be too high. At this time, the control system will reduce the power of the heating lamps, usually set to 0% – 50% of the original normal operating power. This can maintain a certain temperature while avoiding problems such as preform adhesion caused by excessive temperature.Layer control: Some more advanced blow molding machines are equipped with layered Halogen Infrared Heating Bulb groups. In terms of temperature control, the switch or power of each layer of heating lamps can be controlled separately according to different production needs and the heating conditions of the preforms. For example, when the preform is first heated, the first layer of Shortwave Infrared Quartz Heat Lamp near the entrance of the preform can be turned on to preheat the preform; as the preform moves, the quartz halogen heat lamp of the subsequent layers can be gradually turned on to gradually increase the temperature of the preform to achieve a uniform heating effect. Moreover, in standby mode, the quartz glass infrared heater lamp of some layers can be turned off as needed to further reduce energy consumption and control temperature.Temperature monitoring feedback:Application of sensors: Multiple temperature sensors are installed in the blow molding machine. These sensors are distributed in different positions of the heating area to monitor the temperature of the preform or heating components in real time. For example, temperature sensors may be installed near the heating lamp tube, on the surface of the preform, and at the entrance of the blow molding mold, so as to obtain temperature information comprehensively and accurately.Feedback control: The temperature sensor transmits the monitored temperature data to the control system of the blow molding machine, and the control system compares and analyzes the preset temperature value with the actual monitored temperature value. If the actual temperature is lower than the preset temperature, the control system will increase the power of the halogen infrared heat lamp or extend the heating time; conversely, if the actual temperature is higher than the preset temperature, the control system will reduce the power of the heating lamp or shorten the heating time, thereby achieving precise control of the temperature.Time control: Set the working time and intermittent time of the Infrared Quartz Heat Lamp, and make reasonable time arrangements according to the heating requirements and production rhythm of the preform. For example, after the preform enters the heating area, the tungsten halogen infrared lamp turns on and continues to work for a period of time to make the preform reach the required temperature; then before the preform enters the blowing mold, there may be a short intermittent time to make the temperature distribution of the preform more uniform, while also avoiding the adverse effects of excessive temperature on the blowing process.Blowing auxiliary control: The blow molding machine is usually equipped with a blower, and the operating status of the blower will also affect the effect of infrared heating and temperature control. During the heating process, reasonable blowing can make the hot air flow around the preform more uniform, enhance the transfer and distribution of heat, and thus improve the uniformity of heating and the accuracy of temperature control. And when in standby mode or when the temperature is too high, the blower can help to quickly reduce the temperature.
