| 摘要 |
PURPOSE:To elute and remove a water-soluble thermoplastic polymer at a high speed in a short time without deforming the molding body by bringing the powder molding body contg. an org. binder consisting of water-soluble and water-insoluble thermoplastic polymers into continuous contact with fresh water. CONSTITUTION:A plastic compact consisting of powder (metal, etc.,) and an org. binder contg. a water-soluble thermoplastic resin (polyethylene oxide, etc.,) and a water-insoluble thermoplastic polymer (polystyrene, etc.,) is degreased, and sintered to produce a sintered body. At this time, plural molding bodies 5 are dipped in the water 2 in an elution tank 1, and placed on a holder 6. The water is discharged from a discharge pipe 3, an equivalent amt. of fresh water 2 is continuously supplied from a water supply pipe 4 to elute and remove the water-soluble polymer from the body 5. The body 5 is then heated by a heating furnace to remove the residual org. binder, and sintered. By this method, the water-soluble polymer is eluted and removed at a high speed, and a high elution rate is obtained even in a large-sized injection-molding body. |
