Powder Coated Tough - Fall/Winter 2007 - (Page 30) Powder Automation cleaning cycle can be programmed to occur when the filters reach a pre-determined pressure level and/or when a certain amount of product has been coated. This increases the performance of the filter media by cleaning only when required. The transfer of powder within the powder coating system can be controlled by the PLC to optimize powder utilization. Reclaimed powder from the recovery system can be transferred to the feed hopper based on the level of the powder in the hopper. In addition, virgin powder can be introduced to the feed hopper as required. By using the PLC to control the transfer, reclaim to virgin mixtures can be controlled to provide a consistent finish quality. When recovering powder from multiple sources, such as booth wiper dropouts, the transfer can be cycled to powder coating system for PLC control is the application of the powder itself. Automating this process can show immediate savings in powder utilization and component wear. In most cases, this process can be easily retrofitted to existing systems. Finish quality is improved by optimizing the operation of the powder application guns. The most common implementation is automated triggering of the powder coating guns. Two methods for automatic triggering are “zone triggering” and “style triggering.” Zone triggering refers to triggering the guns based on the part profile. A typical application uses photo sensors to scan the product as it enters the powder-coating booth. The photo sensor information is stored in the PLC and creates a digital “image” of the product. This diagram offers an example of a PLC rack configuration. A PLC consists of several components: a CPU (central processing unit) and I/O (input/output) modules. prevent overloading the system with reclaimed material. Also, multiple powder transfer modes can be programmed into the PLC and selected by the operator through the operator interface. Powder Delivery Probably the most popular area of the 30 Powder Coated Tough http://www.fostoriaindustries.com http://www.fostoriaindustries.com
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