Abstract: An inventory management system for evaluating delivery execution ratio of component part supplier is established between computers of a product manufacturer and at least one component part supplier over a network connection. The inventory management system can regularly calculate a delivery execution ratio of each component part supplier based on estimated product demand sent by a product manufacturer, quantity of product promised by the component part supplier in response to the estimated product demand, and actual delivery of the promised quantity of product by the component part supplier.

Abstract: A twin screw extruder type batch mixer that is comprised of two screws parallel to each other with the distance between the two screw center lines being larger or equal than the half of the sum of two screw diameters and the two screws conveying material in the opposite direction during mixing and reacting stage and the same direction during charging and discharging stages; and a barrel casing completely enclosing said screws which can run clockwise and counter-clockwise independently.