transparent parts inside the bubble, how to solve this problem, non -, what is the cause?
It is a bit complicated, did not see the kind, generally there are two possible reasons: one is that there may be more humid caused the raw materials, WIP bubbles appear relatively thick, dense and bubble like you; this can be ruled out, there is a lack of a little exhaust design mold. Specific reasons to see objects in order to determine! I wonder if I can help you.
1 back when there is air into the screw, increase the point back pressure, 2 shooting back position is too far, appropriate to reduce 3, control the temperature of the mold, do not use cold water 4 injection molding process adjustment, using multi-stage injection and packing forms and other reasons
First of all, we should first analyze where this gas comes from, and how to prevent and reduce the generation of gas.First, when the particles melt in the screw, it will produce smoke. Second, the mold cavity itself contains air, at the time of injection if the air line out will be wrapped into the material to. Third, the moisture in the material produces water vapor at high temperature. (do not think that the drying temperature and time are enough, it must be dry, and wet weather will not be dried by ordinary dryers)From these three directions to improve, first, reduce the material temperature (reduce the production of smoke). Two, slow down the injection rate (which is good for the exhaust gas). Three increase mold temperature (improve material flow due to lower material speed). Four, fully guarantee the drying of materials (PC and PA66 moisture content must be less than 0.03%). Five, the mold into the glue point to enlarge (conducive to the actual effect of packing). Six, the increase in back pressure (effectively increase the density of the material). Seven, the mold exhaust should be guaranteed.From the above points by item examination and improvement, the problem will certainly be solved.In addition, just look at the picture, playing this bubble, the process must be a problem.
