| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of determining presence or absence of occurrence of a resin leak inside a hollow molding with good accuracy in molding a hollow molding by die slide injection.SOLUTION: In a molding quality determination method for hollow moldings, a pressure sensor for detection of the internal pressure of a mold is provided, and, in a previous step, a change of the internal pressure of the mold when a hollow molding is molded normally is recorded as the reference internal pressure change. In an actual operation, with the dwelling step (H) after the lapse of a 1/6 of the total time for the dwelling step (H) taken as the monitor target period (K), occurrence of a resin leak is determined when the internal pressure of the mold decreases from the pressure change rate of the reference internal pressure change by a specified value. For example, in the monitor target step (K), occurrence of a resin leak is determined when the pressure change rate of the internal pressure of the mold decreases from the pressure change rate of the reference internal pressure change by a specified value. |
