Custom Pressure Boxes: Tired of the lost time, fiddling with constantly changing widths and indexes? Then J&R Plastics has an alternative solution: A solid, 1 piece pressure box, that greatly reduces change over down-time and produces quicker run times due to a much smaller pressure chamber than that of an adjustable pressure box. By implementing a moving clamp plate, you can produce better material distribution by having more control over vacuum timing. These are affordable solutions to your custom pressure form needs which also result in the highest quality thermoformed products.