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21. 发明授权

US06745492B1 Process and installation for manufacturing a preform, implementing improved drying means, and plastic receipient obtained from the preform 有权
标题翻译：用于制造预成型件的工艺和安装，实施改进的干燥装置以及从预制件获得的塑料接收器
公开(公告)号：US06745492B1
公开(公告)日：2004-06-08
申请号：US09856870
申请日：2001-08-30
申请人： Frank Haesendonckx
发明人： Frank Haesendonckx
IPC分类号： F26B1712
CPC分类号： B29B13/065 , B29C49/06 , B29C2791/001 , B29K2067/00 , B29K2067/003 , B29K2105/253
摘要： The process for manufacturing a preform from at least one thermoplastic resin in the form of granules (A) and in a substantially crystalline state, comprises following successive operations are carried out: drying the thermoplastic resin in the form of granules; melting the dried granules of resins; injecting the melted resin into a mould and removing the preform from the mould; The drying operation is carried out in at least two successive separate steps: in a first step (first hopper 5), the granules of resin substantially in a crystalline state are dried for a predetermined duration (t1) at a predetermined drying temperature (T1); in a second step (second hopper 5′), the drying of the granules from the first step is continued at a drying temperature (T2) that is markedly higher than the drying temperature (T1) of the first stage, and for a duration (t2) that is markedly shorter than the period (t1) of the first step.
摘要翻译：从颗粒（A）形式的至少一种热塑性树脂制造预成型体并基本上为结晶状态的方法包括以下连续操作：将颗粒形式的热塑性树脂干燥;将干燥的颗粒将熔融的树脂注入模具中并从模具中取出预型件;干燥操作在至少两个连续的分离步骤中进行：在第一步骤（第一料斗5）中，基本上处于结晶状态的树脂颗粒在预定的干燥温度（T1）下干燥预定的时间（t1）;在第二步骤（第二料斗5'）中，在明显地干燥温度（T2）下继续干燥第一步骤的颗粒高于第一阶段的干燥温度（T1），并且持续时间（t2）明显短于第一步骤的周期（t1）。

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