Injection Molding
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ABS product brittle cracking——plasticizing capacity mismatch
Fenómeno do problema
The product is brittle and the melt is uneven, with unplasticized particles or uneven color mixing visible, or the whole batch has insufficient toughness, clearly related to the machine specification.
Análise das causas
If the plasticizing capacity of the '2079851475616104452 machine is too small, ABS is insufficiently heated and sheared, plasticized unevenly, the melt composition is uneven, and the toughness is poor; if the plasticizing capacity is too large, the melt stays too long and is repeatedly heated and sheared, aging and degrading, also brittle——the two extremes lead to the same result.
Solução
①Select a machine with plasticizing capacity matching the product weight (the product weight is generally 30%~80% of the plasticizing capacity); ②when the equipment is fixed, adjust the screw speed and back pressure to optimize the plasticizing time; ③avoid using large machines for small products causing long residence; ④observe the melt state (uniform, no lumps, no yellowing) to determine whether the plasticizing is in place.
Conclusão principal
Matching the ABS plasticizing capacity with the product is the first equipment gate against brittleness: too large or too small both cause brittleness; factoring in 'residence time' when selecting the machine is far more effective than adjusting the process on the wrong machine afterwards.
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