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    • 9. 发明公开
    • Food tray and method of making the same
    • Speisenbehälterund Verfahren zur Herstellung desselben。
    • EP0605082A1
    • 1994-07-06
    • EP93306585.6
    • 1993-08-19
    • Welex Incorporated
    • Nissel, Frank R.
    • B65D81/34B29C47/04
    • B29D22/003B29C51/002B29K2067/00B29L2031/22B65D81/3453Y10S220/12Y10S220/14Y10T428/1352Y10T428/139Y10T428/1397
    • A food container (1) thermoformed from co-extruded polyethylene terephthalate sheet, a portion of which contains a nucleating agent. The food container comprises an opaque or colored tray (3) formed from nucleated polyethylene terephthalate in a crystalline state so that the tray remains rigid at elevated temperatures. The food container also comprises a substantially transparent cover (2) formed from non-nucleated polyethylene terephthalate in an amorphous state. The food container also comprises a hinge (4) that integrally connects the cover to the tray. The method for producing this food container comprises the steps of co-extruding nucleated and non-nucleated polyethylene terephthalate into a continuous sheet; independently controlling the temperature of the mold portions for the cover, tray and hinge components of the food container; thermoforming the polyethylene terephthalate sheet; maintaining the tray component of the container at a temperature sufficient to crystallize the polyethylene terephthalate in the tray component; and cooling the cover component of the container to a temperature sufficient to produce polyethylene terephthalate in an amorphous state.
    • 由共挤出的聚对苯二甲酸乙二醇酯片材热塑成形的食品容器(1),其一部分含有成核剂。 食品容器包括由结晶状态的有核聚对苯二甲酸乙二醇酯形成的不透明或有色托盘(3),使托盘在升高的温度下保持刚性。 食品容器还包括由非成核聚对苯二甲酸乙二醇酯形成的基本透明的覆盖物(2),其为无定形状态。 食物容器还包括将盖整体连接到托盘的铰链(4)。 制造该食品容器的方法包括以下步骤:将成核和非成核聚对苯二甲酸乙二醇酯共挤出成连续片; 独立地控制食品容器的盖,托盘和铰链部件的模具部分的温度; 热成型聚对苯二甲酸乙二酯片; 将容器的托盘部件保持在足以使聚对苯二甲酸乙二醇酯结晶在托盘部件中的温度; 并将容器的盖部件冷却到足以产生无定形状态的聚对苯二甲酸乙二醇酯的温度。