Direct blow-molded container manufacturing method and package

摘要

The present invention provides a method of manufacturing a practical direct-blow molded container having excellent barrier property against fuels, chemicals, various gases including oxygen. The method of manufacturing a practical direct-blow molded container containing the metaxylylene group-containing polyamide (C) being dispersed and layered in the polyolefin (A) includes using a die provided with a die body having a flow hole in which the melted resin extruded from an extruder flows and a cylindrical hollow having an opening in the lower side and the flow hole in the upper side, the opening and the flow hole opening downward and upward, respectively, a mandrel having a tip in the upper side, the tip pointing to the opening of the tip of the flow hole, a flow path clearance formed between the hollow of the die body and the mandrel, the flow path clearance defining a resin flow path, and a support part formed in the flow path clearance, the support part holding the mandrel in the hollow of the die body.

主权项

1. A method of manufacturing a direct blow-molded container, the container comprising 60 to 90% by mass of a polyolefin (A), 5 to 30% by mass of an acid-modified polyolefin (B), and 2 to 35% by mass of a metaxylylene group-containing polyamide (C), the metaxylylene group-containing polyamide (C) being dispersed and layered in the polyolefin (A), the method comprising:
using a die provided with
a die body having a flow hole in which melted resin extruded from an extruder flows and a cylindrical hollow having an opening in a lower side and the flow hole in an upper side, the opening and the flow hole opening downward and upward, respectively,a mandrel having a tip in an upper side, the tip pointing to the opening of the tip of the flow hole, anda support part formed in a flow path clearance so that the flow path clearance formed between the hollow of the die body and the mandrel defining a resin flow path, the support part holding the mandrel in the hollow of the die body; setting the temperature of the die to fall within a range between a melt beginning temperature and a melt ending temperature of the metaxylylene group-containing polyamide (C), the melt beginning temperature and the melt ending temperature being measured with a differential scanning calorimeter; feeding melted resin formed by the extruder to the flow hole; forming the melted resin flowing through the flow hole in a cylindrical shape wrapping around the mandrel by the tip of the mandrel; passing the cylindrical melted resin through the support part in the flow path clearance to divide the cylindrical melted resin immediately before the support part; joining the divided resin immediately after the support part so as to form the joined melted resin in a cylindrical shape again; and extruding the cylindrical melted resin from the opening; to obtain a container comprising 60 to 90% by mass of a polyolefin (A), 5 to 30% by mass of an acid-modified polyolefin (B), and 2 to 35% by mass of a metaxylylene group-containing polyamide (C), the metaxylylene group-containing polyamide (C) being dispersed and layered in the polyolefin (A).