AVKO

The main causes of problems in the application of product to various components are: Inclusions, Poor cleaning or silicone contamination, Poor spray techniques, Poor handling

These may all be generally eliminated by careful attention to detail, tight quality control inspection procedures and by thorough and regular housekeeping.  A schedule of equipment maintenance and inspection should be laid down and this should be closely adhered to and recorded to minimise downtime. Some points to note here are to ensure that the components are thoroughly prepared and that the incoming air to the booth is properly filtered.  These will eliminate most of the problems, although a few vital pointers are given below.

This sometimes occurs on foamed and recycled PVC-u or sections of hard PVC-u.

Drying times may be extended by using different thinners in extremely warm conditions or when spraying certain shapes which may result in excessive over-spray. 

There are several spray techniques that could result in poor results, which have been identified.  They are not definitive, but with experience have been found to be those, which most commonly occur.  These are each given with their causes and solutions.

This can be a problem when PVC-u is sprayed and removing protective film from the sheets and profiles generally causes it.  An air curtain or a pulsed type static eliminator can be used.

Cleaning should be carried out at a number of stages, some of which are detailed below: