聚酯容器，具有良好热封性和透明度。
专利摘要
提供了一种聚酯容器，其具有通过取向结晶而具有机械强度、透明性和耐热性的凸缘部分，该聚酯容器表现出低温热封性，通过在结晶的凸缘部分的上表面形成突出部分而提供，该突出部分至少在构成热封面的区域是非晶的或低结晶度的。此外，为了抑制与盖构件的密封强度的不均匀性并稳定地实现高密封性，突出部分在与盖构件热封时变形，以形成树脂片，该树脂片朝向容器内部突出，同时基本紧贴开口边缘部分的上表面。形成的树脂片与盖构件的密封剂层结合。
Original abstractA polyester container furnished with a flange part having mechanical strength, transparency, and heat resistance through orientational crystallization, which polyester container exhibits low-temperature heat sealability, is provided by forming a projecting portion at an upper surface of the crystallized flange part, the projecting portion at at least a heat-sealing-face constituting region rendered amorphous or of low crystallinity. Further, in order to suppress the unevenness of the strength of sealing with a cover member and stably attain the high sealability, the projecting portion is deformed at the time of heat sealing with the cover member so as to form a resin piece protruding toward the interior of the container while being substantially appressed against the upper surface of an opening rim part. The formed resin piece couples with a sealant layer of the cover member.
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