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Designing Plastic - Quality
YaMa-Design
Quality can be summarised as 'fitness of a product for use'. It is inherent in good design. Some aspects of quality include assessing the finish and appearance of components besides checking dimension. Other considerations should include the capability of the production techniques (material, machines and tools) to produce the required standards of component. Quality must be considered from the earliest stages of design and specification. Every manufacturing concern should have some type of quality control section or philosophy. Besides an inspection department responsible for checking parts and assemblies, there should be engineers (liaising with design and production engineers) who will set quality standards. The engineers should also compile quality schedules, inspection charts and arrange statistical sample inspection. In the smaller manufacturing concern, the quality functions may well be part of the designer's remit.
Throughout production, quality control should be apply from materials checking at the goods inward stage, through to finished parts and dispatch areas. Quality engineers will generally be responsible, with production engineers for machine capability trials. These can include monitoring all features of injection moulding machines and operating cycles in order to comply with dimensional standards, freedom from short shots, flashes, burns and other appearance defects.
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