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In China, there are 10 injection moulding companies who manufacture Bakelite handles like my company. And there is only one phenolic moulding compound manufacturer nationally. Their capacity 200tonnes/month. However, they export much more than they produce. I am investigating this issue about two years. Their production cannot work alone in the plasitc injection moulding machines. So, we always have to mix the local one and the exported ones. There is no stable production in this field. I also tried to get these answers from the Chinese injection mould manufacturer. They are not sharing information naturally. Also I asked some professors in chemical engineering but this field is not popular and is not well known. It is worth to know, if I cannot find the procedures and all stuff of this project I am going to start the have them in chemical engineering.

A fourth process is to paint the core of the injection mould before injecting the material. This slows down the plastic injection moulding operation and may result in to expensive a part. I suggest you look at what your competitors are utilizing on similar products. Then make your decision based on that analysis and your requirements for your lenses appearance. I provided four processes that you will see more often than the injection mould finish option. David has provided his suggestion based on his success and I agree with the sand blasting as an alternative. As he noted - it can be repaired and once again made uniform by the injection moulder as the need arises. You can also use a chemical etch on the cavity side, using standard texturing processes. The amount of etch might in the area of MT11000 or equivalent. Whatever is used, it is highly dependent on the optical path (geometry of the part, specific led, and required amount of diffusion). Long light pipe, or plastic cap for a button, or ... There were times, when we had to add either a diffuse film on the back of the light pipe, or a milkly part. Sometimes; you can also add some TiO to the resin used to plastic injection mould the light pipe, if it is not very long. There are lots of great EDM finishes to choose from. If you would like a free guide, contact Poco EDM in Decatur, TX, or visit their website. Most common EDM in Charmilles, so request that plaque. You might need to sneak up on it, try a real fine texture first. I did work at HP, and we used EDM and Mould-Tech or compatible texture companies. I have run a few pilot samples of Coca-cola labels onto red PC panels. Locating labels into the injection mould can be challenging if the plastic injection mould was not built for this, but the result if mastered, can be very rewarding and pleasing to your customer. Clear labels with colored text provided a good look. You may have to try a variety of thicknesses.

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