Injection Molding Defects And Solutions

3 Critical Hidden Defects Inside High-Filled Thick-Wall Plastic Parts 2026-08-04

3 Critical Hidden Defects Inside High-Filled Thick-Wall Plastic Parts High glass fiber and mineral-filled plastics are widely used in automotive, appliance, and industrial structural applications because they provide excellent stiffness, strength, and dimensional stability. However, thick-wall molded components made from highly filled plastics are highly susceptible to hidden internal defects, inc...

How to Clean Injection Molding Machine Screws and Barrels Properly 2026-05-15

In daily injection molding production, whether the screw and barrel are truly clean directly affects the optical appearance of the final product, overall mechanical strength, and the efficiency of color or material changeovers. In many cases, when the defect rate remains high, the root cause is often residual carbonized black specks, mixed-color fibers, or degraded material deposits formed under p...

Selection of Injection Speed for Plastic Parts 2026-04-17

Control of Injection Molding Process and Selection of Injection Speed The control of the injection molding process has a direct impact on the final part quality and the economic efficiency of production. Process parameters must be thoroughly studied to achieve maximum benefits and optimal product quality. With the continuous upgrading of household appliances, product designs have become increasing...

Possible Causes of Flash in PEEK Injection Molded Parts 2026-03-26

Flash in PEEK Injection Molding: 9 Common Causes 1. Part projected area exceeds the injection machine’s maximum allowable area When the projected area of the part exceeds the maximum allowed by the injection molding machine, the nozzle may not adequately cover the entire surface, resulting in flash on the part. 2. Incorrect mold installation or uneven single-direction force If the mold is installe...

Analysis and Solutions for Injection Molding Defects Caused by Dimensional Instability 2026-03-26

Dimensional Instability in Injection Molding Dimensional Instability in Injection Molding: Causes and Solutions 1. Inconsistent Molding Conditions or Improper Operation During injection molding, process parameters such as temperature, pressure, and timing must be strictly controlled according to specifications. The molding cycle for each part must remain consistent and should not be changed arbitr...

Key Factors That Determine Cooling Time in Injection Molding 2026-01-30

Cooling Time in Injection Molding In injection molding production, the cooling time of plastic injection-molded parts accounts for approximately 80% of the entire molding cycle. Insufficient cooling often leads to warpage, deformation, or surface defects, which directly affect product dimensional stability. Properly balancing injection time, packing/holding time, and cooling time is essential for ...

Injection Molding Defects and Solutions -- Whitening 2025-10-20

Whitening (Stress Whitening): During demolding, excessive ejection force is applied to the surface areas around ejector pins or grooves. Due to forced demolding, high internal stress develops in these regions, sometimes causing deformation. Whitening is a sign of stress cracking. Materials such as ABS and HIPS are particularly prone to this phenomenon.

Injection Molding Defects and Solutions -- Stains 2025-10-20

Stains, Impurities, and Foreign Substances The plastic material is impure or contaminated. 23.1 Causes 23.2 Solutions 23.1.1 Raw materials, pellets, or pigments are impure. 23.2.1 Replace the raw materials, dyes, or pigments. 23.1.2 The plastic has decomposed or deteriorated. 23.2.2 Adjust the processing conditions to prevent material decomposition. 23.1.3 The barrel and hopper are not clean. 23.2...

Injection Molding Defects and Solutions -- Poor Transparency 2025-10-20

Poor Transparency: Due to poor contact between the molten material and the mold surface, tiny pits appear on the surface of the molded part, causing light scattering. Alternatively, the mold surface may not be sufficiently polished, resulting in decreased or uneven transparency in transparent products. 22.1 Causes 22.2 Solutions 22.1.1 Low mold temperature or low material temperature, causing poor...

Injection Molding Defects and Solutions -- Dull Surface 2025-10-20

Dull Surface (Lack of Gloss): Due to poor mold surface finish, inadequate contact between the molten material and the mold surface, or improper material and mold temperatures, the molded product fails to exhibit the natural gloss of the resin. Instead, the surface appears whitish, cloudy, or dull. 21.1 Causes 21.2 Solutions 21.1.1 Poor mold surface finish; presence of scratches, moisture, or oil c...

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