中空吹塑的吹塑体例和工艺
中空成品的吹塑包含三个首要体例:
1、挤出吹塑:首要用于未被撑持的型坯加工;
2、打针吹塑:首要用于由金属型芯撑持的型坯加工;
3、拉伸吹塑:包含挤出一拉伸一吹塑、打针一拉伸一吹塑两种体例,可加工双轴取向的成品,极大地下降出产本钱和改良成品机能。
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中空吹塑的工艺前提,请求吹胀模具中型坯的紧缩氛围必须清洁。打针吹塑氛围压力为 0.55 ~ 1MPa ;挤出吹塑压力为 0.2l ~ 0.62MPa ,而拉伸吹塑压力常常须要高达 4MPa 。在塑料凝结中,高压使成品发生的内应力低,应力分离较平均,且低应力可改良成品的拉伸、打击、曲折等机能。
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