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單螺旋塑料再生粒子機的工作特性

來源:塑膠資訊發布時間:2021-03-10 15:22:33點擊率:

在理論上,單螺旋微粒再生機與錐形異向式雙螺旋微粒再生機的工作原理是不同的。廢塑料再生顆粒機單螺桿輸送物料,在螺桿加料時物料還是固體,靠摩擦拖拉。這時物料要向前移動,與螺桿的摩擦必須小于與機筒的摩擦。為增加廢棄塑料單螺桿再生微粒機的擠出量,物料在螺桿表面應能自由滑動,并與機筒表面的摩擦 大。實踐證明,該方法能使螺桿具有較低的表面粗糙度,并采用縱向拉槽機筒。


螺旋均勻段,物料靠粘滯拉力向前移動。粘著效率,也就是熔體輸送效率,主要與螺桿轉速、螺桿均勻段深度和機頭壓力等因素有關。一般而言,螺桿轉速越高,擠出量就越大。
增加螺桿均化段槽深可增加螺桿對熔體的輸送。然而,螺桿均化段的槽深增大,熔體的反向流量會增大,且是均化段的三次均化段的值增大,也就是說,如果槽深增大一倍,熔體的反向流量會增大一倍,而反向流量會增大八倍。所以,在頭壓較小的情況下,宜采用具有較大均化槽深的螺桿,而頭壓較大的情況下,則不宜采用具有較深均化槽深的螺桿來提熔體。所以一般采用提高螺桿轉速的方法,以提高廢塑料單螺桿再生粒子機的產量。
就另一方面而言,當各種外部條件已確定時,增加廢塑料再生顆粒機物料塑化所需的熱能,來自于機筒中的加熱裝置和螺桿轉動產生的摩擦熱能,也只能通過提高螺桿轉速來增加產量。
當擠出聚烯烴材料的預期產量較高時,可提高廢棄塑料再生微粒機的設計轉速。但對于像PVC這樣的熱敏性塑料,螺桿轉速過高時會產生局部摩擦熱,很容易造成PVC的分解。所以,如果用單螺桿廢塑料再生顆粒機擠出聚氯乙烯干粉,螺桿轉速不能太高,擠出產量也不會太大。

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