{"id":757,"date":"2026-05-06T06:52:12","date_gmt":"2026-05-06T06:52:12","guid":{"rendered":"https:\/\/isbm-blow-molding.com\/?p=757"},"modified":"2026-05-06T06:52:12","modified_gmt":"2026-05-06T06:52:12","slug":"isbm-stress-whitening-uneven-wall-thickness-troubleshooting-guide","status":"publish","type":"post","link":"https:\/\/isbm-blow-molding.com\/el\/isbm-stress-whitening-uneven-wall-thickness-troubleshooting-guide\/","title":{"rendered":"\u0391\u03bd\u03c4\u03b9\u03bc\u03b5\u03c4\u03ce\u03c0\u03b9\u03c3\u03b7 \u03c0\u03c1\u03bf\u03b2\u03bb\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd ISBM \u03c3\u03b5 \u03b2\u03ac\u03b8\u03bf\u03c2 \u2014 \u039b\u03b5\u03cd\u03ba\u03b1\u03bd\u03c3\u03b7 \u03bb\u03cc\u03b3\u03c9 \u03c4\u03ac\u03c3\u03b7\u03c2, \u0391\u03bd\u03ce\u03bc\u03b1\u03bb\u03bf\u03b9 \u03c4\u03bf\u03af\u03c7\u03bf\u03b9, \u0391\u03c0\u03bf\u03bc\u03b5\u03b9\u03bd\u03ac\u03c1\u03b9\u03b1 \u03c0\u03cd\u03bb\u03b7\u03c2"},"content":{"rendered":"
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Defect Troubleshooting \u00b7 Technical Deep Dive<\/div>\n

The Ultimate ISBM Defect Troubleshooting Guide: Fixing Stress Whitening, Uneven Wall Thickness, and Gate Vestige<\/h1>\n

Three defects account for 60\u201375% of all bottle rejection on Korean ISBM lines: stress whitening (cloudy walls), uneven wall thickness (inconsistent stretching), and gate vestige (visible base mark). Each has a precise mechanical root cause and a precise corrective action. This is the diagnostic playbook Korean Ever-Power engineers use when called to a production floor \u2014 now in your hands.<\/p>\n

\u0393\u03c1\u03b1\u03c6\u03b5\u03af\u03bf \u039c\u03b7\u03c7\u03b1\u03bd\u03b9\u03ba\u03ae\u03c2 Korean Ever-Power \u00b7 Ansan-si, Gyeonggi-do \u00b7 \u0395\u03bd\u03b7\u03bc\u03b5\u03c1\u03ce\u03b8\u03b7\u03ba\u03b5 \u03c4\u03bf 2026<\/div>\n<\/div>\n<\/header>\n

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TL;DR \u2014 30-Second Diagnostic<\/div>\n

Stress whitening<\/strong> = polymer stretched while too cold or unevenly heated. Fix path: integrated temperature control, multi-stage conditioning, mould cooling rate calibration. Uneven wall thickness<\/strong> = preform reaches the stretch phase with non-uniform temperature or the stretch rod motion is inconsistent. Fix path: differential heating profiles, servo stretch rod calibration, mould water circuit balancing. Gate vestige<\/strong> = injection gate not cleanly trimmed before blow. Fix path: dedicated servo gate-cutting station, conditioning thermal profile, mould nozzle geometry.<\/p>\n

All three defects have one underlying architectural commonality: they’re rare on properly engineered 4-station and 6-station ISBM platforms, frequent on 3-station or budget machines lacking dedicated conditioning architecture. The “fix” is sometimes a process parameter; often it’s an equipment architecture decision the producer made years earlier. This guide tells you which is which.<\/p>\n<\/section>\n

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