초록 ▼

This invention provides a synthetic resin thin-walled bottle, a tubular intermediate therefor and a method of producing a thin-walled bottle. The thin-walled bottle has ribs at least at its bottom portion, and the bottle bottom is raised up frusto-conically or has an undulatory shape. The tubular in

This invention provides a synthetic resin thin-walled bottle, a tubular intermediate therefor and a method of producing a thin-walled bottle. The thin-walled bottle has ribs at least at its bottom portion, and the bottle bottom is raised up frusto-conically or has an undulatory shape. The tubular intermediate is first formed with ribs which become thin-walled protuberant ribs after blow molding. The thin-walled bottle is produced by blow-molding the ribbed tubular intermediate.

대표청구항 ▼

A biaxially oriented synthetic resin thin-walled bottle, made by blow molding an injection molded intermediate, comprising a neck portion defining an opening, a hollow cylindrical barrel body portion interconnecting said neck portion and a bottom portion, said bottom portion having a central part bu

A biaxially oriented synthetic resin thin-walled bottle, made by blow molding an injection molded intermediate, comprising a neck portion defining an opening, a hollow cylindrical barrel body portion interconnecting said neck portion and a bottom portion, said bottom portion having a central part bulged inwardly to form a frusto-conical raised portion and an annular ground contacting wall surrounding said raised portion and connecting with said barrel body portion, wherein: the inner surface of said annular ground contacting wall is provided with a plurality of inwardly projecting rigid ribs so that said bottom portion at the positions of said rigid ribs is thicker than the remainder of the bottom portion, said outer surface of said bottom portion being uniformly smooth and continuous at the locations of said internal rigid ribs; said rigid ribs being formed integrally with said bottom portion during the blow molding of said injection molded intermediate having a plurality of ridges provided on its internal surface which correspond to said rigid internal ribs of said biaxially oriented bottle, said rigid internal ribs being the result of the expansion of said ridges of said intermediate during biaxial orientation only.