The role of halogen heating lamp in bottle blowing machineIn bottle blowing machine, halogen heating lamp mainly plays the role of heating plastic preforms. The following is a detailed introduction:
  1. Working principleHalogen heating lamp is a thermal radiation heating device. It uses electric current to make the filament (usually tungsten filament) heat up. When the temperature of the filament rises, a large amount of infrared radiation will be generated. Infrared radiation can be directly absorbed by the plastic preform, which intensifies the movement of plastic molecules and thus increases the temperature of the preform. This heating method has high thermal efficiency and can quickly transfer heat to the plastic material.
  2. Specific roleSoften plasticThe raw materials processed by bottle blowing machine are generally plastic particles, which are formed into preforms through extrusion and other processes. The preform needs to reach a certain degree of softness before blowing the bottle so that it can be smoothly blown into shape under the action of compressed air. Halogen heating lamp can heat the preform to a suitable temperature range to soften the plastic material. For example, for polyethylene terephthalate (PET) plastic, when heated to about 100-120\\u2103, the activity of its molecular chain is enhanced, and the plastic becomes well plastic, providing a suitable material state for the subsequent blowing process.Ensure uniform bottle wall thicknessDuring the blowing process, uniform heating is one of the key factors to ensure the quality of the bottle. Halogen heating lamps can heat the parison in all directions through reasonable layout. For example, in a rotary blow molding machine, the parison is evenly irradiated by the halogen heating lamp during the rotation process, so that the temperature distribution in the circumferential direction of the parison is relatively uniform. In this way, during blowing, the plastic material can be evenly distributed, thereby ensuring uniform bottle wall thickness. If the heating is uneven, the plastic in the high temperature area will be more easily blown during blowing, resulting in deviations in the bottle wall thickness, affecting the quality and performance of the bottle.Improve blowing efficiencyBecause halogen heating lamps can provide heat quickly, the parison can reach the required temperature for blowing in a shorter time. Compared with some other heating methods, such as natural convection heating, halogen heating lamps heat faster. This helps to improve the production efficiency of the blow molding machine, and in the process of mass production of plastic bottles, more qualified bottles can be produced per unit time.

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