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Dear all, Recently, i am compounding some transparent colored PMMA for my customer. The application use is for optical lens, the molded part is very simple with rectangular in shape. However, during my QC checks, the powder(fines) content is controled at very little %, black spot too. However...

Hi Pud, There is no colour of the streaks. To put it plainly, i would see it as silver streaks alike. We are suspecting it's due to the tooling of design of the part that result in this. But again, in the commerical world users would always go for modification of the tooling as last resort.

Dear all, My customer is facing some streaking problems with injection moulding of this EVA material for a shoe sole. The molded part is somewhat curvy and with thick and thin areas, this part is used for medical purposes to help flat footed people. The EVA used is from Taiwan Formosa Taisox...

So far, i have not heard of any issues on % of water affecting ABS after processing be it extrusion or injection.Unless, ABS is undergoing many thermal history, water content will drastically affect the chemical structure of the material eg. poor impact strength.

1stly, if the brand or grade of the polyester resin are different, it is definitely different unless one of them stole the recipe from the other. I am not well-versed in polyester but doing QA in a colouring house, i am aware that different resin makers have different formulations. They add in...

Hi Patprimmer, Can you explain further on the concept behind on the purging material compatability with temperature and chemical stability of both material being purged and to be used next. You mentioned something about steam generated from water helping to dislodge material stuck in dead spots...

Unexpectedly, I asked my technicans to try using 10%glass filled crastin(PBT) which i have some KG on hand to try removing the black spot contaminations. It turned out quite well, we see big improvement using after about 1kg. I was thinking instead of having 40-60% of CaCO3 which is likely to...

Hi all, Anyone have any idea what's the composition of purging compounds used to purge extrusion and injection machines that can effectively remove the carbon and dirt within the screw ? As you know, these purge compounds are quite expensive and i'm trying to find out the concept of this...

I'm having problems with crack lines on my part for a radio comestic part. I cannot detect any defects after colour compounding and injection moulding. Suspect it's due to internal stress. Any ideas ? faced many market claims for that. Material is Iupilon S3000R PC.

I having a problem on crack lines on a radio comestic part. It's small and thin, but the cracks cannot be found after compounding and moulding. Market claims were filed. Is this due to internal stress, i'm using Iupilon S3000R PC.