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Typical Defects of UV 3C Coatings (12)

Typical Defects of UV 3C Coatings (12)

During the application of UV 3C coatings, whitening is one of the common defects that adversely affect the appearance quality of the coating. It manifests as a lighter, paler shade than the intended color, with a milky‑white haze and reduced transparency and color saturation. Whitening is particularly pronounced in light‑colored finishes and clear coats, compromising the product’s intended color effect and gloss. The occurrence of whitening is closely linked to the presence of moisture and is influenced by multiple factors, including substrate condition, environmental conditions, and coating properties. Understanding the characteristics and causes of whitening helps to identify this defect during production.

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Typical Defects of UV 3C Coatings (XI)

Typical Defects of UV 3C Coatings (XI)

During the application of UV 3C coatings, sagging is one of the most common defects that compromise the uniformity of coating thickness. It manifests as downward flow of the coating on vertical surfaces, resulting in an uneven film—thick in some areas and thin in others. This defect frequently occurs on the sidewalls and edges of workpieces and is particularly pronounced in 3C products with vertical surfaces, such as mobile phone housings and laptop panels. Sagging not only compromises the aesthetic consistency of the coating but can also lead to localized film‑thickness exceedances, potentially triggering additional issues like incomplete curing. Understanding the characteristics and root causes of sagging helps operators identify and mitigate this defect during production.

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2026

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06

Typical Defects of UV 3C Coatings (10)

Typical Defects of UV 3C Coatings (10)

Among the various defects in UV 3C coatings, poor adhesion is a serious issue that compromises coating reliability. It manifests as the paint film easily peeling off the substrate—so much so that it can be removed with a simple tape test—indicating insufficient interfacial bonding strength between the coating and the substrate. Adhesion is the foundation upon which a coating’s protective function depends; inadequate adhesion directly results in the failure of the coating’s protective performance. Understanding the characteristics and root causes of poor adhesion is crucial for quality control and defect identification.

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2026

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Typical Defects of UV 3C Coatings (9)

Typical Defects of UV 3C Coatings (9)

During the application of UV‑3C coatings, curing‑shrinkage patterns represent a rather unique type of surface defect. They arise when the coating film develops uneven shrinkage during UV curing, resulting in textured surface irregularities. Unlike leveling issues such as orange peel or craters, these defects stem from volumetric changes that occur during the coating’s curing reaction. In high‑end electronic products like smartphones and laptops, the presence of shrinkage patterns can directly compromise the product’s aesthetic quality and may adversely affect the long‑term durability of the coating.

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2026

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Typical Defects of UV 3C Coatings (Part 8)

Typical Defects of UV 3C Coatings (Part 8)

During the application of UV 3C coatings, over‑curing is a common curing defect that contrasts with under‑curing. It manifests as increased brittleness, yellowing, and reduced adhesion, all of which compromise the coating’s performance and service life. UV‑curable coatings rely on ultraviolet light to initiate polymerization and form a crosslinked network; however, when the UV energy is excessively intense or the irradiation time is too long, the already formed polymer network may undergo excessive crosslinking or even degradation, leading to a deterioration in coating properties. Understanding the characteristics and causes of over‑curing is essential for identifying this defect during production and quality control.

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2026

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Typical Defects of UV 3C Coatings (VII)

Typical Defects of UV 3C Coatings (VII)

During the application of UV 3C coatings, insufficient curing is one of the key defects that compromise coating performance. It manifests as a sticky surface, inadequate hardness, and poor adhesion after curing, directly undermining the coating’s protective function and the product’s reliability. Curing is the critical step that distinguishes UV coatings from conventional ones; insufficient curing indicates that the crosslinking reaction has not proceeded fully, preventing the polymer network from attaining its intended density and strength. Understanding the symptoms and root causes of under‑curing is essential for identifying this defect.

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2026

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Typical Defects of UV 3C Coatings (VI)

Typical Defects of UV 3C Coatings (VI)

Edge retraction is a common surface defect in the UV 3C coating process, significantly affecting both the edge‑protection performance and the overall aesthetic quality of the coating. Unlike pinholes—localized defects that typically occur in the bulk of the coating—edge retraction manifests as a tendency for the coating to shrink or recede at the substrate edges or in specific areas, resulting in reduced coating thickness at the edges and, in severe cases, exposure of the substrate. Given the stringent requirements of 3C products for coating integrity and edge‑protection performance, identifying the root causes of edge retraction and implementing effective process controls are of critical importance.

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2026

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Typical Defects of UV 3C Coatings (Part 5)

Typical Defects of UV 3C Coatings (Part 5)

During the application of UV 3C coatings, cratering is a surface defect caused by poor leveling. It manifests as circular pits on the wet film surface, resulting from differences in surface tension between the top and bottom layers, and is typically visible through the substrate. The presence of cratering compromises the continuity and integrity of the coating, adversely affecting both its appearance and its protective performance. In the context of 3C electronic products, which demand stringent surface quality, the identification of cratering defects and the analysis of their underlying causes are of great significance.

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