Slot nozzle assembly, slot coating gun, shim plate, and method of extruding a foamable melted material in a wide band

Problem: To prevent a foamable melted material from foaming in the interior of a slot nozzle assembly. Means of Solution: A slot nozzle assembly (2) for extruding a foamable melted material in a wide band was provided with a plurality of foamable melted material passages (20), lateral distribution flow routes (21, 22) communicating with the plurality of foamable melted material passages, a restriction member (8) disposed inside the lateral distribution flow routes, a slot (23) for discharging foamable melted material, and a converging portion (22a) which communicates with the lateral distribution flow routes and the slot, and whose cross-section area gradually becomes smaller toward the slot.