| 摘要 |
PURPOSE: A hollow injection device and injection method is provided to shorten the time for exchanging resin color, and to improve the appearance of an injection product. CONSTITUTION: In a hollow injection device, a fixed mold(101) and a movable mold(102) have a cavity(105) corresponding to the appearance of products in coupling state. A resin supply passage is formed in the fixed mold(101) and movable mold(102), and supplies resin to the cavity(105). A gas pin(108) injects high-pressure gas into the cavity, and forms a hollow part in the resin. A resin counterflow isolating unit is installed at the resin supply passage, and isolates the resin flowing backward in the cavity. A resin counterflow control unit applies pressure to the counterflow resin. A pressure sensor measures the pressure of the counterflow resin.
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