| 摘要 |
PURPOSE: A material mixing and supplying device for forming resin is provided to prevent wrong mixture of materials, and to decrease the failure rate of products by quickly checking damage of a piston for opening and closing an injection hole through which main and sub materials are injected. CONSTITUTION: A material mixing and supplying device(30) comprises a material cylinder(22) having plural material injection ports(23,24) injecting various materials at high pressure, and a material piston(26) operated in the material cylinder to open and close the material injection ports. Materials are mixed in the material cylinder in moving the material piston backward in the material cylinder to open the material injection ports. A spare discharge passage(28) is formed in the material piston, and opened at one side to discharge material flowing into the material piston through the damage portion. Damage of the material piston is checked easily in discharging material through the spare discharge passage.
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