Hot dip coating of plastisol is a common method of applying a protective, decorative, or functional plastic vinyl coating on a variety of metal parts. Typical applications provide a protective layer against sharp or rough materials, a protective plastic layer to prevent corrosion, or just a beautiful and soft coating to enhance the product's appearance.
It is much more cost effective to do a one step dip to coat a
product, for instance a tool grip, 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 better to the
product to be coated. Applications for dip coating are
extensive and include:
• Hand tools
• Medical Instruments
• Electrical Equipment
• Plumbing Fittings
Completing your plastic dip coating project is a straight-forward and comprehensive process. We work with you throughout the production cycle to ensure the final product meets your design and material specifications.
1. Provide the coating specifications and material
properties; i.e., color, durometer, and thickness.
2. We submit a quote for your acceptance
3. You provide samples of the product to be coated.
4. We test dip coat the product and provide finished samples to spec
5. Upon approval, you ship the product to be coated to us.
6. Proceed to full production
1. Part Cleaning
Parts to be coated should be chemically cleaned to remove contaminants . This results in superior primer adhesion as well as improved corrosion resistance.
2. Part Priming
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.
3. Part Dipping
The primed part, hot from the primer conversion bake, is immersed in the liquid plastic polymer. All hot parts of the product immersed in the liquid polymer will coat upon withdrawal from the bath with a layer of semi-fused plastic. 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 plastic compound used. The higher the metal temperature, the longer the immersion time, and the greater the film thickness.
4. Fusion (Curing) plastic polymer
The part covered with the semi-fused polymer is baked to a temperature between 300°F and 350°F, depending upon the specific plastic compound formula. This completes the fusion of the coating, and adhesion to the product.
5. Cooling the Coated Part
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 in a tank of circulating cool water to a maximum of 120°F before handling.
6. Complete end product
The finished coated product is then removed from the conveyors and readied for packing and shipment.
Advantages of Dip Coating
Southwest Latex dip coatings provide safe ergonomics and beautiful finishes. This process deposits a coat of PVC plastisol adding a protective layer of cushioning which enhances the handling and appearance of your product.
1. Dip coating provides a protective shield that resists corrosion.
2. Insulates against heat, cold, stress and electrical currents.
3. Adaptable to high volume orders requiring fast delivery.
4. Durable and UV resistant.
5. Alternative colors and finishes (glossy and matt) can be created easily and economically.
6. A wide range of thicknesses, textures, and durometers (hardness) are available.
7. Dip Coating is sound damping and eliminates the need to debur base materials