TPR Plastic injection molding materials testing before us – injection molding, i
According to the material characteristics and feeding conditions, the general response to the material before the molding process the appearance and performance testing. Supply of aggregates often contain different levels of water flux and Other Volatile low molecular weight materials, especially those with a tendency to TPR moisture absorption process is always more than the permitted limit. Therefore, must be dried before processing and measurement of water content. In the high temperature TPR requires moisture content below 5%, or 2% to 3%, so commonly used vacuum oven at 75 ~ 90 Dry 2 hours. Already dry materials must be properly sealed in order to prevent further material from the air drying effects of loss of moisture, drying room for this hopper can be used continuously for Injection molding machine Provide dry heat materials, simplified operations, to keep clean, improve quality, increase the injection rate were favorable. Drying hopper of the loading mass and generally the injection molding machine with feeding amount of 2.5 times per hour. With SBC-based TPE In color than most other TPR material. Therefore, they need only small amounts of masterbatch can achieve a particular color effect, and the resulting color is more pure than other TPR. In general, the viscosity should be better than TPR masterbatch viscosity is low, because TPR melt index higher than the masterbatch, which will help disperse the process, making the color more evenly distributed.
For to SBS Based TPE, recommended polystyrene containing reagent.
To hard for the SEBS-based TPR, recommended Polypropylene (PP) Containing reagent.
For a more soft SEBS-based TPR, can use low-density polyethylene or ethylene vinyl acetate copolymer. For soft varieties, is not recommended PP containing reagent, as hardness of the composites will be affected.
Plastic injection molding for the application of certain packages, use Polyethylene (PE) Containing color agents may increase the bonding strength with a negative impact. The new injection molding machines purchased before the beginning of use, or need to change the product in production, the replacement of raw materials, exchange, or find plastic in the color decomposition and we all need a barrel on the injection molding machine to clean or washable.
Cleaning barrel heating cylinder commonly used cleaning method. Cleaning materials in the plastic material (or plastic recycled material). For TPR material, can be used in the processing of new material replacement cleaning materials out of the transition.
In the processing injection molding process, the temperature settings are accurate product appearance and performance is the key to good and bad. The following is the injection temperature for TPR process set some suggestions.
Feed zone temperature should be set quite low, to avoid the inlet plug and allow entrained air to escape. When using the masterbatch mixing time in order to improve the state, the transition region, the temperature should be set above the melting point of the masterbatch. Injection nozzle from the recent regional temperature should be set too close to the temperature required to melt. So, after testing, usually TPR products in different regions of temperature setting range is: Barrel 160 degrees Celsius to 210 degrees Celsius, the nozzle is 180 degrees Celsius to 230 degrees Celsius.
Mold temperature and injection zone should be set high condensation temperature, which will be able to avoid the pollution of water on the mold surface of which products stripes. Higher mold temperature usually results in longer cycles, but it can improve the appearance of weld lines and products, showing that the range should be designed mold temperature set at between 30 and 40.
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