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Coating of dishwasher baskets in

 TALISMAN 10

The following is a guide for the coating of Talisman 10 onto dishwasher baskets:

Talisman 10 has been successfully coated onto dishwasher baskets by a number of companies throughout the world. Typical coating conditions are:

In the event that a post-heat is not available the following conditions would be recommended:

For difficult baskets where there is a large difference in the diameters of the wires or if the edges to the wires are sharp, Plascoat would recommend that the pre-heat time be shortened to 2 minutes and the pre-heat temperature is raised over 400 °C.

There should be a minimum of 90 seconds between dipping of the basket in the fluidised bed and quenching in water.

Notes:

1. Ensure that there is detergent in the water quench tank to avoid "water-marks" at the wire cross-over points. A typical concentration is 0.1% - 0.4% of household detergent in water.
2. The use of a water quench is not necessary except for handling purposes. If a water quench is used it is essential that there is a period of at least 90 seconds between dipping and quenching. The use of a water quench within 150 seconds of the dip time will marginally increase the mechanical flexibility of Talisman

3. Polyamide (nylon) 11 and 12 can be easily contaminated by foreign polymers causing "craters" in the coating of flat surfaces and Talisman 10 is no exception. It is recommended that stocks of nylon 11 and 12 are kept away from the coating area and that any tanks of nylon are covered and removed. After the trials it is recommended that the coating area is vacuum cleaned prior to recommencing with the coating of nylon. In general, dishwasher baskets contain no flat areas and therefore craters in nylon are less likely to be formed.

4. Small amounts of contamination of nylon 11 or 12 in Talisman 10 do not cause a problem.

5. Plascoat recommends, as with the coating of nylon and polyethylenes, that there is adequate extraction above the dip station and in the post-heat ovens.

6. Adhesion of the Talisman 10 to the metal is determined by the pre-heat temperature. It is unlikely that good adhesion will occur if the temperature of the pre-heat oven is below 360°C. If the steel has turned "blue" and is dipped reasonably quickly into the fluidising tank, then good adhesion is usually achieved.

7. Coating thickness of Talisman 10 is determined mostly by the dip-time - not pre-heat temperature. Talisman 10 will "pick-up" more readily than nylon and usually the dip-time will need to be reduced compared to nylon.

8. "Ovality" of the coating is often an issue with nylon powders. In all monitored production runs "ovality" of Talisman 10 is not considered to be a significant problem.

9. As with all coating materials, it is recommended that the articles are moved slightly in the fluidised bed for optimum coating results.

10. Ensure there is a suitable filter medium in the fluidising tank. Plascoat recommend 6 sheets of paper of grammage 280 g/m² and air resistance 3000Ps. More details can be found here.

11. Ensure an adequate blower size is used for the fluidising tank. This will depend on the dimensions of the tank. The calculations for the blower size can be found here.

12. Ensure that the fluidising tank is very well earthed. Static build-up in the bed can contribute to the formation of pinholes in difficult welds.

Data Sheet - Talisman 10  Data Sheet - Talisman 20  Data Sheet - Talisman 30  A comparison of Talisman 10 and nylon

Suggested specification for the coating of dishwasher baskets in Talisman 10   

Talisman for dishwasher basket coating      A comparison of Talisman and nylons

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