Surface Delamination (Peeling) | Justway

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Surface Delamination (Peeling)

Last updated on Jul 22, 2026

(1) What is Surface Delamination? (Visual Defect)

As the name suggests, surface delamination is a phenomenon where the surface layer of molded parts peels off.

Mechanism Explanation

Injection molded parts generally consist of a surface skin layer and an inner core layer. Molten resin enters the mold cavity in jet flow form. While the surface layer solidifies, the inner material continues flowing. Poor adhesion at the interface between the two layers causes separation, which is defined as interfacial delamination.

Figure 1: Delamination on 120mm Square Flat Plate (The delamination length in this case is approx. 2 cm)

Gate

⚙️ Mechanism

Poor adhesion at the interface between skin layer and core layer.

🎯 Typical Manifestations

Local lifting, sheet-like peeling, abnormal surface texture.

👁 Inspection

Focus Areas near gates, jet flow paths, local whitening or layered traces.

Inspection Checklist

☑ Compare with acceptable reference surface

☑ Lightly scrape to verify layer separation

☑ Record defect location and area

☑ Keep photos of defective samples

Plastic Part Cosmetic Defect Training – Simple Reference for Quality Inspectors

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