| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass bottle having a high alkali resistance while excellent in surface smoothness and usable not only as an one-way bottle but also as a returnable bottle being usable repeatedly in many times in which deterioration of strength due to scratches on its external face is prevented. SOLUTION: A base glass bottle regulated in its external face temperature at 500-650 deg.C, preferably at 600-650 deg.C, is brought into contact with a material capable of forming a metal oxide film mainly composed of ZrO2 to form a coating film mainly composed of ZrO2 of a thickness of 50-2,000Åon the external face of the base glass bottle. Therefore, a glass bottle having a high alkali resistance, excellent in surface smoothness can be manufactured in which deterioration of strength resulting from scratches at its external face is prevented.
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