![]() There are times where an operator needs to add solvent. (For purposes of this summary, we will use solvent to refer to both solvent in solvent-based paints and water in water-borne paints). His fourth and perhaps most significant observation concerned solvent additions combined with arbitrary process adjustments. This is an important distinction as oxidation is one of the primary forms of degradation for most chemicals. Another important difference is that agitation can entrap air in the paint – and how much depends on the degree of agitation and how long it continues – whereas tumbling limits air exposure to that already in the drum. While tumbling and agitation serve much the same purpose, tumbling mixes the paint before it is used, whereas agitation mixes the paint as it is being used. He admitted that most end users do an adequate job of agitation. His third observation was that the paint needs to be agitated. A simple tumbling before using the paint helps blend everything and put the pigment back in suspension to promote consistent color application. The resin, pigments, and solvents can, and do, separate as the paint sits stagnant. His second observation was that the paint is often not tumbled before it is used. Those companies that adhere to FIFO are less likely to suffer from changes that take place as those paints age. Add to this list that small volume of air in the top of each drum. The amount of change varies by formulation and is the result of the reactions between the myriad chemicals that make up a specific paint. His first observation was that end users sometimes ignore FIFO, (First in First out). We thought his insights were helpful, so we decided to share a summary of them here. ![]() He said what we often hear from paint suppliers, “Our paints don’t vary much from batch to batch.” When we asked why their customers often have a different perception he said, “Most of the variations that they see are self-inflicted.” That prompted us to request a more in-depth conversation so we could better understand how end users may be unknowingly creating their own batch variations. During our conversation we discussed the batch-to-batch variation of the paints they supply. At an event recently, we struck up a conversation with an Account Manager at one of the major paint suppliers. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |