Nylon 66, reason for break at stress?
Nylon 66, reason for break at stress? other than humidity chemical additives and overdry, abuse of regrind material ? any other recommendation I may consider
If your processing is normal then the only reason for brake that left is too much stress on the part. reduce stress or make changes to your part.
drying : keep the material about 0.3 - 0.5 % humidity
mold temp : no less then 60 .deg. (if your wall thickness less then
about 2 mm)
melt temp : rear 260, tip 280-300
injection : as fast as possible
regrind : stay below 25%
holding prs.: 500-600 bar (absolute)
back prs. : 10-20 bar (plasticizing speed as slow as possible)
gate location can have influence to stressed filling of the part
sharp corners in mold causing sheer?