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Injection Molding Defects and Solutions -- Weld Line
2025-10-17
Weld Line: When two or more streams of molten resin meet and the temperature drops during flow, the resin at the junction fails to fully fuse or bond. This results in a fine line formed along the surface or inside the molded part at the point of convergence. 6.1 Causes 6.2 Solutions 6.1.1 Low nozzle temperature or low mold temperature. 6.2.1 Increase melt and mold temperatures to improve resin flo...
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Injection Molding Defects and Solutions -- Delamination or Peeling
2025-10-17
Delamination or Peeling: This defect occurs when foreign materials are mixed into the raw material, the mold temperature is too low, or the material compatibility is poor. Excessive shear stress during melt flow along the mold surface causes the material to separate into thin layers, resulting in peeling or delamination. 5.1 Causes 5.2 Solutions 5.1.1 Material not properly dried. 5.2.1 Dry the mat...
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Injection Molding Defects and Solutions -- Flash and Burrs
2025-10-17
Flash and Burrs: When the molten material enters the gaps between the mold parting surfaces or the joints between the mold and the slider, excess thin fins or burrs appear on the molded part. 4.1 Causes 4.2 Solutions 4.1.1 Poor closing or misalignment at the parting surface. 4.2.1 Increase clamping force; repair the mold parting surface to ensure tight fitting. 4.1.2 Excessive clearance between th...
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Injection Molding Defects and Solutions -- Silver Streaks
2025-10-17
Silver Streaks: Shiny, silvery lines appearing on the surface of the molded product or near the gate along the flow direction. These are caused by excessive moisture or volatile substances in the material, poor adhesion between the melt and the mold, or rapid cooling after the melt has been subjected to excessive shear stress—resulting in needle-like or mica-like streaks. In addition, if the silve...
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Injection Molding Defects and Solutions -- Sink marks
2025-10-11
Sink Marks (Depressions) Surface dents or depressions appear on molded parts. This defect occurs when the molten resin shrinks in volume during cooling and solidification but is not sufficiently compensated by additional material. It often appears on the backside of thick sections or behind ribs. Causes (2.1) Solutions (2.2) 2.1.1 Runner or gate too small, or insufficient number of gates. 2.2.1 Im...
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Injection Molding Defects and Solutions -- Incomplete filling
2025-10-11
Short shot / Incomplete filling The molten resin cannot completely fill the mold cavity. Causes (1.1) Solutions (1.2) 1.1.1 Injection volume insufficient; not enough material added. 1.2.1 Increase the material feed. 1.1.2 Inadequate plasticizing capacity or insufficient residual material. 1.2.2 Replace the machine or adjust process parameters to increase residual material. 1.1.3 Plastic particle s...
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Customer Project: PA12-LCF40 Solution for Wire Rope End Fitting
2025-09-17
Customer Project: PA12-LCF40 Solution for Wire Rope End Fitting body { font-family: 'Inter', sans-serif; line-height: 1.6; color: #333; background-color: #fff; margin: 0; padding: 0; } .container { max-width: 900px; margin: auto; padding: 20px; } h1, h2, h3 { color: #00924f; transition: all 0.3s ease; } h1:hover, h2:hover, h3:hover { color: #006f3b; transform: translateY(-3px); } p { margin-bottom...
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A Quick Guide to the Power of Glass Fiber Reinforcement
2025-09-15
When you pick up your phone, take apart an auto part, or look at a home appliance casing, you might not realize that hidden inside these seemingly ordinary plastic products lies a kind of “invisible rebar” — glass fiber (GF). From PP + 20% GF to PA + 60% GF, these reinforcing fibers quietly support the plastic matrix, much like steel bars inside concrete. Today, let’s uncover the mystery of long g...
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Carbon Fiber Composite Applications for Automotive Lightweighting
2025-09-02
With global climate warming and the increasing depletion of fossil fuel resources, promoting green energy and sustainable development has become a global consensus. As a product of modern industrial civilization, the automotive industry is facing unprecedented pressure to save energy and reduce emissions, making vehicle lightweighting an important approach to address these challenges. Among variou...
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