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The plastic mold is a kind of machinery that is matched with the injection molding machine in the industry. The mold structure is complicated and the precision is required to be high, giving the plastic product a tool with a complete configuration and accurate dimensions. Due to the variety of plastics and the different processing methods, the structures of injection molding machines and plastic products are also varied. Therefore, the structure and design of plastic molds are also varied.
We ACO Mold provide professional one-stop service for injection custom molding, manufacture, injection molding, spraying, screen printing, assembly, etc. The products involve electronics, home, office, automotive and other industries, and have formed an annual output of several hundred million RMB mold design and manufacturing / injection / spray / assembly and other perfect industrial chain. With high quality moulds and excellent service, we have won the trust of our customers and have become Lenovo, HP etc. Fortune 500 companies mold and plastic parts designated suppliers.
If you are gathering inputs for a "Zero Rework" program, the Flash (Burr) issue is one of many injection molding problems to be considered. I have been involved with a number of Quality Initiatives that were specific to injection molded plastic parts, from Clear Lenses to larger Cosmetic components and to attempt to explain all of the "Lessons Learned" and "Best Practices" which are employed by "Best In Class Suppliers" can fill volumes. I have long looked at the Automotive Industry as being on the Leading Edge of Plastic Injection Molding Technology----Both with Resin (Polymer Science) as well as the latest processing capabilities for Injection Molding Machines and Material Delivery Systems. Since the "Best In Class" molders are typically rated on specific products that may not relate to yours, I would strongly suggest that you partner with your Material Suppliers to better understand the latest "Best Practices" being used today----and possibly for the Near Term Research Technologies on the horizon. During the 1980's & 90's I partnered with GE and Bayer and this proved to be a Win-Win for all involved.
If we missed the expected cooling time it should be because the part is not shrinking at a predicted rate. This would mean the predicted shrink in the injection mold was either miscalculated or the resin is shrinking different than expected. If all of the four variables are optimized then the only reason we should miss our cycle time due to cooling time is a missed shrink factor. Exit temp of the part would have been calculated into the original estimated cycle time. Your answer assumes the part is shrinking exactly as predicted and the injection mold maker used the exact shrink rate on the steel. I have never purchased resin from a supplier where they said "your resin will shrink .010" exactly every time" In fact some ranges are extreme. Now I can control that shrinkage to a point with pack pressure which has nothing to do with exit temp. Exit temp is a good place to start but doesn't always work in the real world.
You were the boss of a plastic injection molding facility. You wanted to improve productivity and you had experienced people to do it; what projects would you choose and in what order? For example: Shorter setup times, scrap reduction, injection mold preventative maintenance, optimum run size etc.

I always believe in the trickle down theory: Big first then little things last.
1. Optimum run size first. If the plastic injection molding machines are running constantly without interruption and the team knows what to do, each minute gets less expensive until you reach the point of diminishing returns.

2. Optimization of molding activities. I try and maximize this by making sure the plastic injection molding personnel have the proper training, especially regarding the "molding dance" as I call it. I have found that economy of motion in loading and unloading molds, if it is not an automated process, is a big time and labor waster. We do a lot of insert molding and the manner and order in which the part is loaded into the mold cavity can make or break the part per hour production.
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