Adhesive dispensing system that has a measurement system that includes a frequency inverter and a closed loop feedback control

摘要

A hot melt adhesive dispensing unit (20), comprising: a supply of adhesive (22) for receiving solid or semi-solid hot adhesive material, an adhesive supply heater (34) associated with said adhesive supply ( 22) for melting the solid or semi-solid hot adhesive material into a liquid hot adhesive material, and a measuring system comprising: a manifold (26) connected with said adhesive supply (22) to receive the liquid hot adhesive material and dividing the liquid hot adhesive material into flow streams, a flow sensor (64) to measure a flow rate of at least one of the flow streams of the liquid hot melt adhesive, said flow sensor generating flow information, a pump (58) connected to said manifold to pump liquid hot adhesive material from said adhesive supply (22) into said manifold, including said pump (58) a pump motor (59), a frequency inverter (66) that controls the speed of said pump motor (59) and that is connected to said flow sensor (64) to receive said flow information, further comprising a controller (28) that provides control information to said frequency inverter (66), in which the control information includes an object flow rate, and in which said frequency inverter (66) adjusts the speed of said pump motor ( 59) so that said flow rate of liquid hot adhesive material approximates said target flow rate.