Molds & Tooling
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ABS product brittle cracking——barrel dead corner degradation
Problem Phenomenon
ABS products produced on the same machine are generally brittle and easy to break, and do not improve after material change; the product color may be slightly yellow, persistent rather than occasional.
Cause Analysis
There are dead corners in the barrel, nozzle, or hot runner, where the melt stays locally for too long, and repeated heating causes the ABS molecular chains to break and degrade, and the toughness drops significantly; the accumulated material in the dead corners continuously contaminates the new material, so changing material cannot cure it; it is an equipment structural problem.
Solution
①Regularly disassemble and clean the barrel, screw, and nozzle to completely remove the accumulated material in dead corners; ②check the wear of the screw and barrel and replace damaged parts; ③use purging material to thoroughly clean the machine when changing material to avoid residues of different materials; ④shorten the residence time of the melt in the barrel; ⑤focus on troubleshooting for large machine-small part conditions.
Key Takeaway
For chronic, widespread brittleness of ABS, prioritize suspecting equipment dead corner degradation rather than the process; purging and disassembling and cleaning dead corners is the fundamental cure; repeatedly adjusting the process on equipment with dead corners only wastes material and covers up hidden dangers.
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