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    • 1. 发明授权
    • Porous irrigation pipe and method
    • 多孔灌溉管道及方法
    • US4616055A
    • 1986-10-07
    • US733711
    • 1985-05-13
    • James W. Mason
    • James W. Mason
    • A01G25/06A01G27/00B29B9/06B29B17/00B29B17/04B29C47/00B29D23/00C08L7/00C08L9/00
    • B29B17/04A01G25/06B29B17/0042B29B9/06B29B9/065B29B9/16B29D23/001B29C2793/009B29C47/0023B29C47/0026B29C47/0042B29K2021/00B29K2105/04B29K2105/26B29L2023/22Y02W30/62Y02W30/625Y10S138/07
    • A mixture of virgin crumb rubber sized to between 30 mesh and 100 mesh containing less than 5%+100 fines and thermoplastic binder, such as carbon black filled polyethylene containing a coating promoter, such as a citrate salt and lubricant, such as a calcium stearate, is mixed in a vented Banburg mixer heated to at least 350.degree. F. to remove volatiles through vent before extrusion. The mixture is formed into sheet in the nip of a two roll assembly and cooled in air before diced into pellets by a dicer.The pellets are formed into porous pipe by extrusion in a pipe extruder having the feeding, transition and metering zones separately heated to temperatures from 320.degree. F. to 400.degree. F. (T.sub.1, T.sub.2, T.sub.3). The die has a separate jacket receiving heat exchange fluid for heating the die to a temperature from 290.degree. F. to 380.degree. F. to form a porous pipe having more uniformly spaced and sized pores and a smoother inner wall surface. The linearity factor, tensile strength and elongation are also improved.
    • 尺寸为30目至100目的含有小于5%+ 100细粒和热塑性粘合剂的预处理橡胶混合物,例如含有涂层促进剂的炭黑填充的聚乙烯,例如柠檬酸盐和润滑剂,例如硬脂酸钙 ,在加热至至少350°F的通风班伯格混合器中混合,以在挤出前通过排气除去挥发物。 将混合物在两辊组件的辊隙中形成片材并在空气中冷却,然后通过切片机切成小丸。 通过在具有进料,过渡和计量区域的管式挤出机中挤出形成多孔管,分别加热至320°F至400°F(T1,T2,T3)。 模具具有一个单独的套管,其接收用于将模具加热至290°F至380°F的热交换流体,以形成具有更均匀间隔和尺寸的孔和更平滑的内壁表面的多孔管。 线性因子,拉伸强度和伸长率也得到提高。