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Arlex Plastics Machinery Co., Ltd.
Arlex Plastics Machinery Co., Ltd.  

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Arlex Plastics Machinery Co., Ltd. [China (Mainland)]


Business Type:Manufacturer
City: Ningbo
Province/State: Zhejiang
Country/Region: China (Mainland)

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Introduction

Plastic processing troubleshooting
Plastic processing troubleshooting
Molding Defects
Alternative name
Descriptions
Causes
Blister
Blistering
Raised or layered zone on surface of the part
Tool or material is too hot, often caused by a lack of cooling around the tool or a faulty heater
Burn Marks
Air Burn/ Gas Burn
Localized burnt zone (often in the yellow/brown tones)
Tool lacks venting, injection speed is too high
Color Streaks
 
Localized change of color
Masterbatch isn't mixing properly, or the material has run out and it's starting to come through as natural only
Delamination
 
Thin mica like layers formed in part wall
Contamination of the material e.g. PP mixed with ABS, very dangerous if the part is being used for a safety critical application as the material has very little strength when delaminated as the materials cannot bond
Flash
Burrs
Excess material in thin layer exceeding normal part geometry
Tool damage, too much injection speed/material injected
Embedded contaminates
Embedded Particulates
Foreign particle (burnt material or other) embedded in the part
Particles on the tool surface, contaminated material or foreign debris in the barrel, or too much shear heat burning the material prior to injection
Flow marks
 
Directionally "off tone" wavy lines or patterns
Injection speeds too slow (the plastic has cooled down too much during injection, injection speeds must be set as fast as you can get away with at all times)
Jetting
 
Deformed part by turbulent flow of material
Poor tool design
Silver streaks
 
Circular pattern around gate caused by hot gas
 
Sink Marks
 
Localized depression (In thicker zones)
Holding time/pressure too low, cooling time too low, with sprueless hot runners this can also be caused by the gate temperature being set too high
Short shot
Non-Fill / Short mold
Partial part
Lack of material, injection speeds too slow
Splay Marks
Splash mark / Silver Streaks
Circular pattern around gate caused by hot gas
 
Stringiness
 
String like remain from previous shot transfer in new shot
Gate hasn't frozen off
Voids
 
Empty space within part (Air pocket)
Lack of holding pressure (holding pressure is used to pack out the part during the holding time)
Weld line
Knit Line
Discolored line where two flow fronts meet
Mold/material temperatures set too low (the material is cold when they meet, so they don't bond)
Warping
Twisting
Distorted part
Cooling is too short, material is too hot, lack of cooling around the tool, incorrect water temperatures (the parts bow inwards towards the cool side of the tool)
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