The so-called barrel temperature control refers to how […]
The so-called barrel temperature control refers to how the plastic in the barrel is uniformly heated from the raw material to a plastic viscous fluid, that is, the problem of how to configure the temperature of the barrel.
The adjustment of the barrel temperature should ensure that the plastic is well plasticized and can be injected smoothly without causing decomposition. This requires that we must not consciously reduce the plasticizing temperature due to the sensitivity of plastics to temperature, and forcibly fill moulds with injection pressure or injection speed. The melting temperature of plastics mainly influences the processing performance, but also affects the surface quality and color.
The control of material temperature is related to the part moulds. Large and simple parts, parts weight and injection volume are close to each other, need to use higher baking temperature, thin wall, complex shape, but also use high baking temperature. For thick-walled parts, some of which require additional operations, such as mounting inserts, can be used to lower the temperature of the oven. To determine whether the temperature of the plastic solution is appropriate or not, use the jog action to observe the air at low pressure and observe the appropriate temperature. The material should be sprayed vigorously and vigorously, with no foam, no curl, continuous light.
The configuration of material temperature is generally from the feed section to the discharge section in ascending order, but in order to prevent the over-exposure of plastic decomposition and the change of the color of the parts can also be slightly lower than the middle section, improperly configured material temperature may sometimes cause the screw failure of the card - - The screw will not rotate or idling. It may also be that the injection pressure is too high or the screw check ring (meson) fails to cause the thin molten material at the front of the cartridge to flow back toward the feed zone.