Before the newly purchased injection molding machine is used, or when the product needs to be changed, the raw material is changed, the color is changed or the plastic is found to be decomposed, it is necessary to clean or disassemble the injection molding machine barrel.
The cleaning barrel generally adopts the heating barrel cleaning method. The cleaning material generally uses plastic raw materials (or plastic recycling materials). For TPR materials, the excess cleaning material can be replaced with the new material being processed.
In the process of injection molding, whether the temperature setting is accurate is the key to the appearance and performance of the product. Below are some suggestions for temperature settings when performing injection molding for TPR processing.
The temperature in the feed area should be set fairly low to avoid clogging of the feed port and allow entrapped air to escape. In order to improve the mixing state when using color masterbatch, the temperature of the transition zone should be set above the melting point of the color masterbatch. The temperature in the area closest to the injection nozzle should be set close to the desired melt temperature.
Therefore, after testing, usually the temperature setting range of tpr products in each area is: the barrel is 160 ℃ to 210 ℃, and the nozzle is 180 ℃ to 230 ℃.
The temperature of the thermoplastic rubber injection mold should be set higher than the condensation temperature of the injection area, which will avoid the contamination of the mold by moisture and the appearance of streaks on the surface of the product. Higher mold temperature usually results in longer cycle times, but it can improve the appearance of the weld line and the product, so the mold temperature range should be set between 30 and 40 °C.
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