{"id":1778,"date":"2026-08-28T03:59:59","date_gmt":"2026-08-28T03:59:59","guid":{"rendered":"https:\/\/isbm-blow-molding.com\/?p=1778"},"modified":"2026-08-28T03:59:59","modified_gmt":"2026-08-28T03:59:59","slug":"how-to-calculate-cavity-count-for-an-injection-blow-molding-machine","status":"publish","type":"post","link":"https:\/\/isbm-blow-molding.com\/fi\/how-to-calculate-cavity-count-for-an-injection-blow-molding-machine\/","title":{"rendered":"Kuinka laskea onteloiden m\u00e4\u00e4r\u00e4 ruiskupuhallusmuovauskoneessa"},"content":{"rendered":"
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IBM CAVITY COUNT \u00b7 ENGINEERING FORMULA \u00b7 PLATEN WIDTH SHOT WEIGHT CLAMPING \u00b7 KOREA EVER-POWER ZQ<\/span><\/p>\n

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How to Calculate
\nOnteloiden m\u00e4\u00e4r\u00e4<\/span> for an
\nInjection Blow Molding Machine:
\nThe Engineer’s Formula<\/span><\/h1>\n

IBM cavity count is determined by three independent physical constraints: platen width (mandrel pitch), maximum injection weight (shot weight limit), and injection clamping force (per-cavity lock-up requirement). The correct cavity count is the minimum value produced by all three constraints. This guide provides the complete formula, five worked examples from 10 ml to 1,000 ml, the full EP-ZQ series cavity count table, and the five most costly calculation errors in pharmaceutical IBM procurement.<\/p>\n

Cavities = min(Platen \u00f7 Pitch, Shot \u00f7 Preform Wt, Clamp \u00f7 Per-Cavity Force)<\/span>
\n10ml \u2192 1,000ml \u00b7 ZQ40\u2013ZQ135 Worked Examples<\/span><\/div>\n

KOREA IKUISESTI VALTA \u00b7 ANSAN-SI, GYEONGGI-DO \u00b7 ELOKUU 2026 \u00b7 VIIMEISIN P\u00c4IVITETTY: ELOKUU 2026<\/p>\n<\/div>\n<\/header>\n

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IBM CAVITY COUNT \u00b7 KEY FORMULA REFERENCE \u00b7 AUGUST 2026<\/p>\n<\/div>\n

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PLATEN CONSTRAINT<\/p>\n

n\u2081 = \u230aW\u2080 \u00f7 p\u230b<\/p>\n

W\u2080 = effective platen width (mm). p = mandrel centre-to-centre pitch (mm) = neck OD + 12\u201318 mm clearance gap. Most commonly the binding constraint for small bottles (10\u201360 ml) on lower-tonnage machines.<\/p>\n<\/div>\n

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SHOT WEIGHT CONSTRAINT<\/p>\n

n\u2082 = \u230aS\u2080 \u00f7 w\u2081\u230b<\/p>\n

S\u2080 = machine max injection weight (g). w\u2081 = single-cavity preform weight (g). Most commonly the binding constraint for large bottles (250\u20131,000 ml) where preform weight is high relative to machine shot capacity.<\/p>\n<\/div>\n

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CLAMPING CONSTRAINT<\/p>\n

n\u2083 = \u230aF\u2080 \u00f7 f\u2081\u230b<\/p>\n

F\u2080 = machine injection clamping force (kN). f\u2081 = clamping force required per cavity (kN) = function of cavity projected area and injection pressure. Rarely the binding constraint at standard pharmaceutical IBM parameters; becomes binding at very high injection speed or thick-wall PP.<\/p>\n<\/div>\n

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FINAL CAVITY COUNT<\/p>\n

n = min(n\u2081, n\u2082, n\u2083)<\/p>\n

The cavity count is the minimum of all three constraints. Ignoring any one constraint produces an invalid cavity count. The most common procurement error is calculating only n\u2081 (platen constraint) and ignoring n\u2082 (shot weight) for large-format bottles \u2014 resulting in tooling orders that cannot run at the specified cavity count.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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