Zinc steel guardrail dusting process, should pay attention to the conductivity of the spreader and spreader on Xu layer shoulds not be too thick, too thick can remove the coating appliance which take the method of centralized incineration; due to heavy workpieces, must design the rack, rack requirements and reliable; the pre drying purposes: one is remove the remaining water, two is to ensure a certain thickness of the powder coating well attached on the surface of the workpiece three is as soon as possible to ensure that the workpiece is heated evenly, speed up the curing process of pre drying temperature is 140 DEG C - go.
For guardrail products, according to its characteristics, using automatic spray gun plus manual spray gun spray supplement combining form, to real time monitoring of the quality of the powder, ensure the stable quality of products. The curing conditions of the general pure phenolic powder coating are 200 DEG C, 10min, and the curing temperature and time can be ensured by adjusting the temperature and the chain speed of the heating furnace.
The dry cold, dry in the process of inspection of the workpiece, to allow such defects, hanging, foaming, show, association hole with acetone to dilute the powder coating, while the workpiece is not dry when the coating process or spray coating on the defect surface with heat curing for major defects need repair, according to the thickness of the coating film selection of different processing methods, generally have directly on a re dusting, mechanical polishing, using three methods of stripping agent.
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