초록 ▼

A self-sustaining container made of a saturated polyester resin, formed by biaxial stretch blow molding and comprising a mouth and cervical portion, a shoulder, a body and a bottom, wherein said bottom has a self-sustaining structure with a plurality of legs radially bulged around the center of the

A self-sustaining container made of a saturated polyester resin, formed by biaxial stretch blow molding and comprising a mouth and cervical portion, a shoulder, a body and a bottom, wherein said bottom has a self-sustaining structure with a plurality of legs radially bulged around the center of the bottom and valley lines formed between the adjacent legs, and the following portions (A) to (E) are low stretched portions and at least portions (B) and (C) among the following portions (A) to (E) are crystallized portions:

대표청구항 ▼

[ What is claimed is:] [1.] A method for suppressing creeping in a self-sustaining container made of a saturated polyester resin, and formed by biaxial stretch blow molding and comprising a mouth and cervical portion, a shoulder, a body and a bottom, wherein said bottom has a self-sustaining structu

[ What is claimed is:] [1.] A method for suppressing creeping in a self-sustaining container made of a saturated polyester resin, and formed by biaxial stretch blow molding and comprising a mouth and cervical portion, a shoulder, a body and a bottom, wherein said bottom has a self-sustaining structure with a plurality of legs radially bulged around the center of the bottom and valley lines formed between the adjacent legs, and the following portions (A) to (E) are low draw ratio portions,(A) center of the bottom(B) peripheral portion of the center of the bottom(C) portion of each valley line close to the center of the bottom(D) portion of each leg from the edge of the peripheral portion of the center of the bottom to a ground contact portion(E) portion between said portions (C) and (D), d method comprising crystallizing at least portions (B) and (C) among said portions (A) to (E) by providing a shielding plate having a slit, between the bottom of said container and a heating source, wherein the side of the shielding plate adjacent the bottom of the container is shaped to fit said bottom and the slit is in registry with said portions to be crystallized, and providing heat from said heat source in an amount sufficient to maintain the surface temperature of the shielding plate at a constant level no higher than the Tg of the material of the container and in an amount sufficient for said crystallizing.