Shanghai Daoqin Plastics Co., Ltd.

         screw extrusion machine as mechanism is screw generate pressure and force, can make material material can separation 进行塑化以 and uniform mixed combined through molding. lower to this plastics extrusion 原则, 你都知道么?

        1, machine 械原则

         more mono screw is right 旋螺纹, 像木工 and machine in use screw and 螺栓. if from rear 面看, it is toward 转动, is it need force toward rear 旋出筒体. in di screw extrusion machine in, screw in 两 筒体 in toward 转动并 versus 互交叉, therefore 一 必 must is right toward, 另一 必 must is left toward.

        2, hot 原则

         thermoplastic property plastics generally used for extrusion production, material in add hot 时熔化并 in cooling again solid molding. plastics hot amount from 何而?进 material preheating and 筒体/ mold add hot device very large function, electrical machine can amount and electrical machine viscous melt retardant force screw formed 于筒体 inner scratch hot amount is has plastics in extrusion most important hot 源.

        3, decrease speed 原则

         in more extrusion machine in, screw speed degree through adjustment electrical machine speed degree achieve. electrical machine usually large 约1750rpm full speed 转动, this for extrusion machine screw fast. if 以如此 fast speed degree 转动, generate more scratch hot amount but also plastics time short can made uniform, very good melt. type decrease speed ratio rate in 10: 1 to 20: 1 between.

        4, material as cooling agent

         extrusion is can amount to add hot plastics upper, from make its melt, 输入进 material ratio to material in and screw surface temperature degree low. to material in surface temperature degree in plastics melting point upper, through and material pellets 接触而 cooling, hot amount hot front toward rear hot amount and can control add hot maintain. currently hot amount viscous property scratch maintain and need hot amount 输入时, can can need rear add hot device.

        5, material inner material material viscous to upper slip to screw upper

         is make mono screw extrusion machine light slip 筒体进 material solid pellets amount to most large, pellets viscous in upper slip to screw upper. if pellets viscous in screw 根部则没 has what can it lower, 通道体积 and solid 体 入口 amount decrease/reduce. in viscous good causes is plastics can can in hot generate and similar pellets, or 者随输出 speed degree 变化间歇 viscous in 断.

        6, material cost most high

         in certain lower material cost can to production cost 80%, more other has factors and. this 原则自然引出两 结论: processing 商应该尽 can can more heavy use material and waste product Raw Materials, can can 严格 遵守容差以免背离 target/goal thick degree and product issues.

        而 can cost versus for is very important, 运行一台 extrusion machine can 源实际 upper is production cost in very less separation, is material cost non high, extrusion machine is has system, if more can amount that plastics hot 以致于无 method positive processing.

        7, screw pressure very important

         this pressure screw lower has material retardant force: and 污染扎碎 machine sheet/plate, device tube/pipe, solid 定搅拌 device and mold 自身. it 不但依赖于 this parts 几何图形 also 依赖于 system in temperature degree, this also effect/influence resin viscosity and through speed degree. safety causes amount temperature degree is very important —— if temperature degree high, and mold can can 爆炸并 for machine and 附近人员造 formed 伤害.

        8, 输出

        输出= most rear 一 螺纹 位移+/- pressure material and 泄漏, most rear 一 螺纹 位移叫做 positive 流, 依赖于 screw 几何形状, screw speed degree and melt density. it pressure material adjustment, upper decrease/reduce amount retardant force 效果(由 most high pressure table/sheet 示) and increase amount material in 任何 咬 combined 效果. upper can can is direction in 任意一 direction.

        9, rate in viscosity in main/primary function

         large more plastics has 剪切变 dilute features, in plastics 受剪切 force large viscosity low. 例如一 PVCs in force increase 一倍时流 speed increase 10倍 or more more. 而LLDPE剪 force decline is more, force increase 一倍时 its speed increase 3 to 4倍. decrease/reduce force reduce 效果意味 extrusion conditions lower high viscosity, this also need more more electrical machine rate.

        10, electrical machine and for 立关系

         is what control 效果并 non is and 期望 一样? if for add hot, 筒壁处 材 material viscosity small, electrical machine in this more add light slip inner need can amount more less, electrical machine electrical decline. versus if cooling, 筒壁处 melt viscosity increase large, electrical machine must more add use force 转动, 安培数 increase, through 筒体时 remove hot amount also by electrical machine 送回.