Yoshino Kogyosho Co., Ltd.

Akio Hashimoto

Masato Suzuki

Daisuke Uesugi

Hiromi Shimura

Tadashi Asai

A biaxially drawn, blow-molded bottle and its preform comprise at least a layer of a gas barrier material laminated inside the PET resin layers, a functional portion having a screw thread raised spirally in the upper portion of neck and also having a stop ring disposed under the screw thread, and a neck ring disposed at the lower end of the neck. In these preform and bottle, the leading edge of the gas barrier layer is positioned at a half height of the neck ring where the most advanced front of the leading edge neither reaches a half height of the stop ring nor extends to the functional portion. It is intended here that the neck would not be affected by the shrinking deformation caused by the existence of the gas barrier layer in the functional portion of the neck, which is treated for thermal crystallization.

Biaxially drawn, blow-molded bottle and its preform

The preform of the biaxially drawn, blow-molded bottle comprises polyethylene terephthalate layersand at least a gas barrier layerlaminated with the polyethylene terephthalate layers. The gas barrier layerextends downward from a level halfway to the height of the neckincluding the neck ring, or at least from above the neck ring, down virtually to the lower end of body. The gas barrier layerinside the wall of the neckhas an average thickness corresponding to a third (&#x2153;) or less of the maximum thickness of the gas barrier layerinside the wall of the body, allowing most of the gas barrier material to be located in the wall of the body. Thus, the gas barrier material is effectively utilized, and in the case of the heat-resistant bottle, the neck has the predetermined dimensions without fail after the whitening treatment.

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Isehara, Japan

Akio Hashimoto