When tire manufacturers need to release vulcanized (cured) tires from molds, they either use force to remove them or apply a release agent. The release agents generally and the forced removal method can cause tires to deform, affecting performance.
Release agents come in two forms, a spray release agent and a semi-permanent release coating. Spray release agents are sprayed on the tire molds and last for one to two days. Commercially available mold lubricant sprays often need to be reapplied about every 10 to 12 tires. The permanent release coating, usually Teflon or an equivalent, is applied using a solvent process and can last weeks or even months.
Evolving Complex Tire Designs Drove Search for New Coating Solution.
Increasingly complex tire designs ultimately led to more demand for polymers like RapidRelease from GVD. Tire treads have a lot more siping, they have serrated siping, and they have 3D siping. In some cases, these designs make it difficult to strip or remove the tire from the mold.
GVD created RapidRelease, an effective mold release coating that is applied to the tire molds; because it’s thin and non-stick, the layer maintains the integrity of fine features, does not block air vents, and facilitates rapid release. The result is less scrap, higher-quality tires, and less downtime due to cleaning, allowing the company to produce more tires and use more-advanced rubbers and features.
Additionally, GVD’s RapidRelease service eliminates the use of PFOA (perfluorooctanoic acid) surfactants commonly used in fluoropolymer permanent release coatings. The benefits of longer coating lifetimes, lower solvent usage, and less environmental impact has attracted support from the US Environmental Protection Agency (EPA) for RapidRelease.
Producing tires is challenging, and tire manufacturers need to find a better way to efficiently meet production demands without sacrificing tire quality. Fortunately, GVD offers an efficient solution for even the most challenging tire mold release requirements.