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AssigneeMitsui Chemicals, Inc.
InventorsTakashi Hama, Toyoaki Sasaki, Kunio Tomita, Takayuki Okuno, Yasuo Kurosaki
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It is an object of the present invention to provide a hollow bottle made of polyester, which has excellent heat resistance and is not likely to undergo deformation or change in capacity even if a liquid of high temperature is filled therein. The present invention relates to a hollow bottle formed by blow molding polyester, which has a thickness in the range of 200 to 400 μm, and satisfies that Δd=d1−d2 is not less than −7 kg/m3 and not more than 7 kg/m3, with d1 [kg/m3] being a density of a part ranging from an outer surface up to 50 μm inward, and d2 [kg/m3] being a density of a part ranging from an inner surface up to 50 μm inward. The polyester is preferably polyethylene terephthalate, and it is preferable that d1=1370 to 1375 kg/m3, while d2=1373 to 1378 kg/m3.
A hollow bottle formed by blow molding polyester, which has a thickness of a bottle body portion in the range of 200 to 400 μm, and satisfies that Δd=d1−d2 is not less than −7 kg/m3 and not more than 7 kg/m3, with d1 [kg/m3] being a density of a part of the body portion ranging from an outer surface up to 50 μm inward, and d2 [kg/m3] being a density of a part of the body portion ranging from an inner surface up to 50 μm inward.
A hollow bottle formed by blow molding polyethylene terephthalate, which has a thickness of a bottle body portion in the range of 200 to 400 μm, and satisfies that d1=1370 to 1375 kg/m3 and d2=1373 to 1378 kg/m3, and that Δd=d1−d2 is not less than −7 kg/m3 and not more than 7 kg/m3, with d1 [kg/m3] being a density of a part of the body portion ranging from an outer surface up to 50 μm inward, and d2 [kg/m3] being a density of a part of the body portion ranging from an inner surface up to 50 μm inward.
A method of producing a hollow bottle by blow molding a preform made of polyethylene terephthalate, which comprises setting an outer surface temperature of the preform, T1, to the range of 120 to 160° C., setting an inner surface temperature of the preform, T2, to the range of 110 to 150° C., and carrying out blow molding in a temperature range satisfying that −10° C.≦(T2−T1)≦10° C.
Dependencies are inferred from the claim text.