Perfusion process is often used for polyurethane and gel production. Inject the feed A and feed B into molds through nozzle, then take the semi product out of molds after them totally reaction.
With high efficiency, one set of mold could output about 70 – 100 pairs;
But need much labors at complex production;
Cannot produce many items with multiple colors by the limitation of equipment;
Material prescription is very important and required much knowledge and experiences.