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Question: Why do you have to clean the barrel and feeding system in medical silicone injection molding when changing the material?

Answer: Cleaning the barrel and feeding system is essential in medical silicone injection molding because it significantly reduces the risk of contamination during the molding process. In thermoplastics injection molding, the barrel is simply purged a few times when changing from one material to another. However, this approach doesn’t completely remove all the material in the barrel and feeding system in silicone injection molding; varying amounts of mixed silicone and purging agent (typically part B of the silicone) will remain in the barrel and feeding system due to their tackiness and low viscosity. As a result, the residual can ultimately get mixed in with the desired material during the subsequent molding process. In addition to cleaning the barrel and feeding system, they should be purged through at least once to remove the cleaning agents.

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Ryan Taylor

Ryan Taylor joined the Albright Technologies team in September of 2014. Previously, he worked in the plastics and rubber industries for 7 years in multiple sales, marketing and management roles. Ryan received a bachelor’s degree in Business Management from Clark University in 2009. At Albright, Ryan works to increase business development through multiple marketing channels and networking within the industries that the company serves. In his spare time outside of work, Ryan enjoys skiing, driving and travelling.

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