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UV Adhesion Promoter Prep Pads： Solutions to the problem of poor ink adhesion and easy peeling on the surface of printed materials

Fault Phenomenon

The printed pattern shows poor adhesion to the substrate. This is typically observed as the pattern peeling off after light scratching or tape application, or partially or completely detaching from the substrate shortly after printing is completed.

Cause Analysis

Substrates with poor adhesion under normal conditions	Specific reasons
Metal	Metal surfaces are usually very smooth and chemically inert. They are often covered by a dense, non-polar oxide layer, which impedes ink penetration into the surface. Due to the lack of active chemical bonding sites and low surface energy, ink adhesion is weak without surface treatment.
Acrylic	Acrylic is an organic polymer, but it has relatively low surface energy. In addition, mold release agents may remain on the surface after manufacturing. Some UV inks are not compatible with acrylic’s functional groups, preventing effective chemical bonding.
Glass / Ceramics	Glass and ceramic surfaces are composed primarily of silicon–oxygen bonds and are chemically stable and non-porous. They typically have low surface energy and readily accumulate moisture films or dust layers, both of which adversely affect ink adhesion.

Required Tools

UV Adhesion Promoter Prep Pads for the corresponding substrate

Disposable Nitrile Gloves
Mask

Safety Precautions

Wear gloves during operation and avoid direct contact with the UV Adhesion Promoter Prep Pads.
Wear a mask to avoid inhaling vapors emitted by the wipes.
Dispose of used wipes in a designated waste container or appropriate disposal area.

Operation Steps

Put on personal protective equipment, including gloves and a mask.
Open a pre-treatment wipe and apply it evenly to the substrate in a single direction; one wipe typically covers an area approximately the size of an A4 sheet.
Place the treated substrate in a clean environment and allow it to stand for approximately 10 minutes.
Proceed with printing on the machine.