Melt fracture is also called sharkskin or surface melt fracture, mostly at die head and material.
Q1: Too narrow of die gap?
A1: Change larger gap die inserts.
Q2: Melt temperature is too low?
A2: Increase temperature of extruder and die head.
Q3: Formulation issue?
A3: Increase more (%) of wider molecular weight polymer(for ex. LDPE) rather than narrower one (for ex. LLDPE).
Q4: Additives insufficient problem?
A4: Increase additives for the processing requirement.
Q5: Too high of output rate?
A5: Lower down output rate.
Q6: Die head material issue?
A6: Choose a suitable material for die head which decreases molten slippage.
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C.Y. Melt fracture? Introduction
Chuo Yii Enterprise Co. is Taiwan supplier and manufacturer in Foundry Industry. C.Y. has been offering our customers high quality Dual Lips Air Ring, Low Gauge Variation Air Ring, HDPE / LDPE / LLDPE / MDPE / PP / PVC / PLA Air Ring, Mono-Layer & Multi-Layer (1 / 2 / 3 / 5 / 6 / 7 Layer) Die Heads, IBC System, Down-Stream Air Ring, PLA Die Head, Rotary Mechanism, Manual and Auto Screen Changer, Central Column & Stabilizing Ring, Heat Sealing Blade, Aluminum Sand Casting Foundry OEM since 2009. With both advanced technology and 20 years experience, C.Y. always make sure to meet each customer's demand.