What factors increase the gloss level of textured parts?
Can anyone tell me what factors increase the gloss level of textured parts? Especially glass filled nylon!
We did some 13% and 30% glass filled nylon with a light texture recently and the thing that effected gloss the most was mold surface temperature. The recommendations for mold surface temperatures between 100- 120C seem correct. To maintain these surface tempuratures and still have a decent cycle time usually requires the use of oil cooled tooling instead of the common water cooled tooling.
The high gloss is the result of a resin rich surface skin with little glass at the surface. The high mold surface tempuratures allow this to happen by keeping the skin soft enough that the flow of the resin in the core of the part will "pull" the fibers away from the non flowing skin. as the part fills. Others think that this happens more during the packing process...