| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection apparatus and a method for injection molding wherein sink mark of an molded article is completely prevented from being generated and amt. of injection material can be saved and wt. reduction can be achieved and the molded article with high resistance to bending and compression can be obtd. SOLUTION: Nylon pellets are carried by means of a screw 31 and are plasticized by heat of a band heater to become a molten resin P, which flows into a communication hole 14 of a nozzle 10. Nitrogen gas bubbles N fed from a gas feeding pipe 29 are mixed into the molten resin P. The molten resin P is carried to the apex side of the nozzle 10 and passes through the first net 13 and the second net 19 and in this instance, the nitrogen gas bubbles N are finely divided and are mixed with the molten resin P to become fine bubbles n, which are uniformly distributed in the molten resin P and the molten resin P contg. fine bubbles n passes through a sprue 35 and is injected into a cavity 37.
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