Method for adjusting pressure of mixture of gas and paste material discharged from dispenser

A method for adjusting pressure of a mixture of a paste material and gas discharged from a dispenser in a mechanical foaming device that generates and discharges the mixture,

• wherein the dispenser includes:
• a nozzle part provided in a tip end part of the dispenser and having a tip end opening through which the mixture is discharged;
• a flow path for the mixture extending from an introduction part for the mixture to the tip end opening through an inside of the nozzle part;
• a needle part movable in the flow path of the nozzle part to open and close the flow path;
• and
• a driving part that drives the needle part,
• the nozzle part has a tapered section in which an inside diameter of the flow path of the nozzle part relative to an operation range of a tip end of the needle part decreases toward the tip end opening,
• as a result of the tip end of the needle part abutting against a closed position of the tapered section, the flow path for the mixture is closed, whereas as a result of the tip end of the needle part moving away from the closed position, the flow path is opened,
• the dispenser further includes:
• a stopper part that limits a moving range of the tip end of the needle part to a range from the closed position to a stop position located rearward relative to the closed position;
• and
• a stopper position adjusting part that adjusts a position of the stopper part to change the stop position, and
• the method comprises a pressure adjusting step of adjusting discharge pressure of the mixture discharged from the tip end opening of the nozzle part to be pressure within a pressure range of 4 MPa to 15 MPa, by adjusting the position of the stopper part with the stopper position adjusting part,
• wherein the mechanical foaming device includes:
• a gas conduit used for transporting the gas;
• a material conduit used for transporting the paste material;
• a connection part to which the gas conduit and the material conduit are connected;
• a mixing part that mixes together the gas and the paste material coming out of the connection part;
• a gas pressure control device that controls pressure of the gas forwarded to the mixing part through the gas conduit;
• a constant flow amount device that keeps constant a flow amount of the mixture of the gas and the paste material mixed by the mixing part;
• and
• the dispenser that receives a supply of the mixture of the gas and the paste material coming out of the constant flow amount device;
• wherein the connection part is at least one piston pump,
• the gas conduit and the material conduit are connected to a cylinder of the piston pump, and
• into a cylinder space formed by raising a piston of the piston pump, the gas transported through the gas conduit and the paste material transported through the material conduit are supplied and the gas and the paste material in the cylinder space are pumped forward to the mixing part as a result of lowering the piston.