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

Patent metadata

Field	Value
Publication number	US-12521747-B2
Application number	US-202217847609-A
Country	US
Kind code	B2
Filing date	Jun 23, 2022
Priority date	Jun 25, 2021
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A dispenser for discharging a mixture of gas and a paste material includes: a nozzle part ( 2 ) provided in a tip end part of a body ( 11 ) and having a tip end opening; a flow path ( 4 ) for the mixture extending from an introduction part ( 5 ) for the mixture to the tip end opening through a hollow space of the nozzle part; a needle part ( 3 ) movable in the flow path of the nozzle part to open and close the flow path 4; a driving part ( 7, 8, and 9 ) that drives the needle part; and a stopper part ( 10, 14, and 16 ) that limits an operation range of the needle part. The nozzle part as 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.

First claim

What is claimed is:

1 . 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.

2 . The method according to claim 1 , wherein
the pressure range of the mixture is either from 5 MPa to 12 MPa or from 6 MPa to 10 MPa.

3 . The method according to claim 1 , wherein
a pressure sensor to measure the discharge pressure is further provided, and the pressure adjusting step comprises adjusting the discharge pressure on a basis of the pressure of the mixture detected by the pressure sensor at a time of the mixture being supplied to the dispenser.

4 . The method according to claim 1 , wherein
the pressure adjusting step comprises estimating the discharge pressure by using a relationship among the discharge pressure, a needle gap amount being a distance between the closed position of the tip end of the needle part and the stop position, viscosity of the paste material, and a discharge flow amount of the mixture and adjusting the needle gap amount so that the estimated discharge pressure is pressure within the pressure range.

5 . The method according to claim 1 , wherein
a rearmost position of the stop position adjusted by the stopper position adjusting part is a position distant from the closed position by a distance equal to or longer than four times a diameter of the tip end opening.

6 . The method according to claim 1 , wherein
as the stopper position adjusting part, the stopper part has a rod screwed into a body of the dispenser in an axial direction, a position of the rod in the axial direction is adjusted according to an amount of being screwed into the body, and the needle part is stopped as a result of a tip end part of the rod abutting against a basal end part of the needle part.

7 . The method according to claim 6 , wherein
the stopper position adjusting part further includes an electric motor disposed to rotate the rod, and the pressure adjusting step comprises adjusting the position of the stopper part by controlling a rotation amount of the rod rotated by the electric motor.

8 . The method according to claim 7 , wherein
a controller is further provided, and in the pressure adjusting step, the controller controls the electric motor so that the discharge pressure is pressure within the pressure range.

9 . The method according to claim 1 , wherein
the stopper position adjusting part has a mechanism that makes the rod manually rotatable, and a display unit that displays the discharge pressure corresponding to the position of the stopper part is further provided.

10 . The method according to claim 1 , wherein
in the position distant rearward from the closed position by a distance four times the diameter of the tip end opening, the inside diameter of the flow path is 1.1 to 3 times larger than the diameter of the tip end opening.

Assignees

• Sunstar Engineering Inc

Inventors

• Omachi Takuro
• Takada Masaharu
• Yamashita Kiichi

Classifications

• B29C44/022 Primary

  Foaming unrestricted by cavity walls, e.g. without using moulds or using only internal cores · CPC title

• B05B7/025

  Nozzles having elongated outlets, e.g. slots, for the material to be sprayed · CPC title

• B05B7/0031

  with disturbing means promoting mixing, e.g. balls, crowns · CPC title

• B05C5/0216

  by relative movement of article and outlet according to a predetermined path · CPC title

• B29B7/801

  Valves · CPC title