Hot dip coating is a great process for adding corrosion protection, increasing friction or grip, or simply adding aesthetics and protection to most any metal. Many types of polymers are available with many color choices, sheen, and texture. To further enhance the dip coating process, a primer can be applied to the metal prior to coating to gain a virtually non removable bond. Other additives to the polymer can add flame retardancy and ultraviolet stabilization. Phthalate free polymers are also available, and as always, lead free.
Dip coating of plastisol/PVC is a well-known method of applying a protective, decorative, or functional plastic vinyl coating to a variety of metal parts.
It is much more cost effective to do a one step dip to coat a product. For instance, a hand weight or a pair of pliers, than it is to injection mold a sleeve and then apply it to the handle. The coated grip is softer, has no seam lines, and adheres or bonds to the product to be coated. Applications for dip coating are extensive and include:
- Amusement Park Lap Bars, Bumpers, Seat Belt Tongues, Extremities of Stars and Characters from Attractions
- Hand tools
- Medical Instruments
- Plumbing Fittings
- Electrical Equipment
- Exercise Equipment
Timeline to Production
Completing your plastic dip coating project is as simple as it gets. We will work with you throughout the production process to ensure the final product meets your design, material, and aesthetic specs.
- You provide samples of the product to be coated.
- You Provide the coating specifications and material properties; i.e., color, finish, durometer, and thickness.
- We submit a quote for your acceptance
- We test dip the product and provide finished samples to spec
- Upon approval, you ship or deliver the product to be coated to us.
- Proceed to full production
Dip Coating process step by step.
Dip Coating Process
- Parts to be coated should be cleaned to remove contaminants . This results in superior primer adhesion as well as improved corrosion resistance.
- If adhesion to the part is desired, application of a primer is required on all sections were polymer coating will be applied. The primed part is flash dried and baked to set the primer and ready the part for the hot dipping operation.
- The primed part, hot from the primer conversion bake, is immersed in the liquid material. All hot parts of the product immersed in the liquid polymer will coat upon withdrawal from the bath with a layer of semi-fused polymers. The amount deposited will depend on the length of time the part was immersed, the metal temperature that the part was immersed at, and the general formulation of the compound used. The higher the metal temperature and the longer the immersion time, the greater the polymer thickness.
- The part covered with the semi-fused polymer is baked to a temperature dependent upon the specific compound formula. This completes the fusion of the coating, and adhesion to the product.
- When the hot part coated with fused polymer comes out of the oven, it is very sensitive to surface marring. The part is cooled down before handling.
- The finished coated product is then removed from the conveyors, inspected and readied for packing and shipment.
The Many Advantages of Dip Coating
Dip coatings provide safe, durable and beautiful finishes. This process deposits a coat of your choice of material from natural latex, synthetic latex, or neoprene, or PVC/Plastisol adding a protective layer which enhances the handling, safety, and appearance of your product.
- Dip coating provides a protective shield that resists corrosion.
- Insulates against heat, cold, stress and electrical currents.
- Adaptable to high volume orders requiring fast delivery.
- Durable and UV resistant.
- Alternative colors and finishes (glossy and matt) can be created easily and economically.
- A wide range of thickness, textures, and durometers (hardness) are available.
- Dip Coating is sound damping and eliminates the need to debur base materials