Trouble name |
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Black spots or streaks appear on the inside or outside of an extruded product. |
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The dimensions of the product are different from the specification or the dimentions are inconsistent. |
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During the extrusion, the part that is extruded from the die pulsates in a wave-shaped from leading to the deterioration in the part shape and dimension. This is mainly due the raw meterial not being fed smoothly. |
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The part is bended. |
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Processing cannot be performed at regular speed due to the extruder moter overload. In the worst case, the extruder driving motor can be broken down or a roaring sound is generated at the gear box. |
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The additives (stabilization agent, lubriciant, or pigment), which is melted from the center of the breaker plate to the mold, is attached on the metal surface of the mold or the pigment by oxidization or dissolution. |
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The extruded parts have a spiral shape due to the instability of the melt. |
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A foreign object like a fish eye exists in the product when extruding the film or the electrical hose wire. |
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In general, shark skin refers to the unevenness that has formed on the part surface in the perpendicular direction to the flow direction. |
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Spider marks are left on the extruded part. |
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A meterial is attached to the inside of the barrel and molds like an eye discharge, and removed from the mold outlet during the process, and attacheds to the part surface. Afterwards, it causes scratch or pin hole. |
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A continuous line is formed in the extrusion direction or in the perpendicular direction during sheet extrusion. |
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When mixing plasticized PVC with a plasticizer, both the plasticizing agent and the pigment intrude each other. |
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The internal surface of extruded parts are rough due to the low processing temperature, or adhension to the die. |
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Gloss on the part surface is poor. |
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Whiteness color of molded part is poor. |
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Tensile or impact strength drops. |
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Foam with a streak shape is developed in the inner layer of the profile. |
Pipe/window profile