As part of an ongoing development we use inflated plastic bladders to lift parts of the equipment. I have been using a bag sealer, described further on, but it really didn't have either the versatility or the grunt, to weld serious bladders and I spent an amount of time chasing leaks. I also glued sheets together to make bladders as I will describe further on. We had a local company welding these on a high frequency welder, but due to the delay, travel and labour costs we decided we needed our own machine. The cost of the commercial units was outside our budget and I only have 240v single phase power.
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