The Goldisgood 525mm 230v 2000w SK15 Clear/Half White Plated Halogen Infrared Heat Lamp has several applications in plastic moulding:
Table of Contents
Pre-Moulding Heating
- Plastic Pellet Drying and Preheating: Before the plastic pellets are fed into the moulding machine, they often need to be dried to remove any moisture. The infrared heat lamp can be used to achieve this. The heat penetrates the pellets, causing the moisture to evaporate. Additionally, preheating the pellets using the lamp can improve their flowability and reduce the energy required for the moulding process. For example, in the case of hygroscopic plastics like nylon, even a small amount of moisture can cause issues like surface defects and reduced mechanical properties in the moulded parts. The heat lamp can ensure the pellets are dry and at an optimal temperature for moulding.
- Mould Surface Preparation: The mould itself can be preheated using the infrared heat lamp. This helps in achieving a more uniform temperature distribution across the mould surface. A warm mould surface allows the molten plastic to flow more evenly and fill the mould cavities completely. It also reduces the temperature difference between the molten plastic and the mould, which can lead to faster cooling and shorter cycle times. For instance, in injection moulding, a properly preheated mould can result in parts with better dimensional accuracy and fewer internal stresses.
During the Moulding Process
- Enhanced Plastic Flow and Filling: As the molten plastic is injected or otherwise introduced into the mould, the infrared heat lamp can be used to maintain the temperature of the plastic and the mould. This helps in ensuring that the plastic flows smoothly and fills all the intricate details and corners of the mould cavities. The heat from the lamp can compensate for any heat loss during the filling process, especially in larger or more complex moulds. For example, in the moulding of thin – walled plastic parts, maintaining the right temperature is crucial to prevent the plastic from solidifying too quickly and causing incomplete filling or short shots.
- Control of Cooling Rate: The heat lamp can also be used to control the cooling rate of the plastic in the mould. By adjusting the intensity or distance of the lamp from the mould, the rate at which the plastic cools can be regulated. This is important as the cooling rate affects the microstructure and properties of the moulded part. A slower cooling rate can result in parts with higher toughness and reduced internal stresses, while a faster cooling rate may be desired for better surface finish and dimensional stability in some cases.
