Thin container production method
OwnerMichio Komatsuinventor
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Abstract
The present invention provides a thin container production method capable of forming a thin container having a thickness of about 0.7 mm by injecting a molten resin of a polylactic acid into a narrow cavity. The production method according to the present invention produces a thin container W having a thickness in a range of 0.3 to 0.7 mm by injection molding of a polylactic acid resin. The molten resin of the polylactic acid impregnated with supercritical carbon dioxide in a range of 0.5 to 2.5 percent by mass relative to the total amount is injected into a cavity 29 corresponding to the thin container W.
Claims5
A thin container production method to produce a thin container having a thickness in a range of 0.3 to 0.7 mm by injection molding of a polylactic acid resin,
- characterized in that a molten resin of a polylactic acid resin impregnated with supercritical carbon dioxide in a range of 0.5 to 2.5 percent by mass relative to the total amount is injected into a plurality of cavities corresponding to the thin container disposed in a mold, and each of opening and closing of a gate to each cavity is performed by an electromagnetic on-off valve for producing a plurality of thin containers by one injection operation, and
- a time period required for the molten resin of the polylactic acid injected into each cavity to reach a distal end of the cavity from the gate is measured, and a time of opening of the gate to each cavity by the electromagnetic on-off valve is controlled based on the measured time period.
Dependencies are inferred from the claim text.