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注塑機廠家帶您了解注塑機螺桿打滑的原因
來源:www.zzhwtt.com 發布時間:2021年05月26日

甘肅注塑機廠家帶您了解注塑機螺桿打滑的原因。人們使用高速注塑機,多為了縮短注塑周期,提高生產效率。然而,在注塑產品生產過程中,注塑機螺桿的打滑,是現存的一大問題。特別是吸濕性材料(如尼龍),樹脂含水量高就會引起注塑機螺桿的打滑。不恰當的干燥會顯著低落物料粘度,并在料筒中發生水蒸汽,因此致使螺桿的輸送本領降低。對此,可在加工前使用濕度闡發儀來確定干燥后物料的含水量,以使物料的干燥水平到達供給商的合理值。


注塑機


注塑機螺桿打滑會引起物料降解,從而影響產物質量。當機筒螺桿產生打滑時,物料大概匯聚集在喂料口,而不能正常輸送到注射機的末端。當螺桿旋轉并在機筒內撤退退卻以輸送物料并籌備下次注射時,螺桿打滑會產生在塑化段。


此時,螺桿的旋轉仍在繼承,但螺桿的軸向活動會停止,即產生打滑。螺桿打滑經常會致使注射前的物料降解,產物質量會降低(如缺料),而成型周期則會延長。螺桿打滑的原因是多方面的,大概與背壓太高、料筒末端過熱或過冷、料筒或螺桿磨損、加料段螺紋太淺、料斗計劃不公道以及料斗被梗塞、樹脂濕潤、樹脂過分潤滑、物料太細大概樹脂及二次生料的不公道切割等因素有關。


料筒末端過冷是引起螺桿打滑的主要原因之一。注射機的料筒分為3段,在末端,即加料段,粒料在加熱和壓縮的進程中,會形成一層熔體薄膜粘到螺桿上。沒有這層薄膜,粒料就不易被輸送到前端。


注塑機加料段的材料需要被加熱光臨界溫度,以形成那層關頭的熔體膜。然而,通常物料在加料段的停留時間很短,無法到達要求的溫度。而這種環境一般會在小型注射機上產生。停留時間太短會造成聚合物的熔融和夾雜進程的不全,從而致使螺桿打滑或失速。

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