How to Prevent Polyurethane Rubber Coating from Delaminating?

One common problem with polyurethane rubber coating is delamination, where the coated layer separates from the roller core. However, by paying attention to both polyurethane material selection and the coating process, delamination can be effectively prevented. According to different working conditions, choosing suitable polyurethane materials and strictly following the rubber coating process can ensure long service life without peeling or cracking.

For polyurethane rubber-coated products such as polyurethane wheels, polyurethane rubber rollers, rubber-coated iron cores, rubber-coated steel plates, rubber-coated aluminum parts, and rubber-coated plastic or nylon components, besides excellent wear resistance, another critical requirement is strong bonding without delamination.

Under long-term and heavy-duty operating conditions, the polyurethane layer must remain firmly bonded to the metal core without peeling off, ensuring a long service life. At the same time, these products are also expected to offer good resistance to oil, hydrolysis, and mild acids and alkalis.

Sandblasting Treatment: The roughened roller core is further processed by sandblasting. Different types of blasting media are selected according to the material of the roller core. The purpose of sandblasting is to create a rougher surface, allowing the polyurethane coating to bond more firmly to the metal core after the rubber coating process.

Cleaning the Roller Core: For new roller cores, the oil, grease, and other contaminants on the surface must be thoroughly cleaned with a suitable cleaning agent. For used roller cores, the old rubber coating should first be removed, and any remaining adhesive or residue on the core surface must then be completely cleaned off with a cleaning agent.

Surface Roughening of the Roller Core: The surface of the roller core is roughened to increase the bonding area between the core and the polyurethane coating, thereby improving adhesion strength.

Polyurethane Coating: The roller core, after undergoing the above treatments, is coated with polyurethane according to the required specifications.

Polyurethane Rubber Wheel Vulcanization: After coating, the rubber-covered roller generally requires a vulcanization time of 10–15 hours. During the vulcanization process, the bond between the roller core and the polyurethane layer becomes strong and permanent, allowing the rubber-coated wheel to fully cure and form its final structure.

Polyurethane Rubber Wheel Grinding: The coated roller is ground according to the customer’s required dimensions and shape. When a high surface finish is required, a CNC grinding machine is used to achieve a mirror-like surface finish on the roller.

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