Plasticisingcomponents to meet your requirements

满足你需求的塑化组件

The screw tip is responsible for the main process phase such as dosing, injection , and holding. Its structural design is also affected by the characteristics of raw materials and products. It can be said that if the choice of screw tip is unreasonable, it will directly affect the efficiency and quality of the product. Today, we will talk about the screw tip.

螺杆头担负着塑化、注塑、保压等主要工艺步骤，其结构设计又受原料特性和产品特性影响。可以说，如果螺杆头的选择不合理，就会直接影响产品的效率和品质。今天，我们就来讲讲螺杆头。

Non return valve – flow cross sections/止逆阀 – 流动截面

Click to enlarge the picture for more details/点击放大图片查看详情

Shear sensitive material/剪切敏感材料

Application of general purpose ring non return valve (standard)/应用通用止逆阀(标准)

Ifeven larger flow cross sections are required →a ring non return valve with increased flow cross sections can be used/如果需要更大的流动截面→可以使用加大的止逆阀

If no ring non return valve can be used due to shear rate i. e. PVC-U→PVC-U screw tip is recommended/如果根据剪切速率没有环形止逆阀可以用 比如 PVC-U→推荐PVC-U螺杆头

Design of PVC screw tip avoids excessive back flow during injection/PVC螺杆头设计避免了注射过程过多的回流

As less as possible shear stress for the processed material/加工材料以尽可能小的剪切力

Large flow cross sections/大的流动截面

No diversion of melt/没有熔体的转移

No dead flow zones/没有流动死点区域

Ring non return valve/环形止逆阀

Application/应用

General purpose non return valve for a very wide range of application/通用止逆阀适用大部分的应用

Features/特点

Exact and reproducible closing/精准可重复关闭

Good sealing during injection and holding pressure/注射保压密封效果好

Low wear/磨损缓慢

Optimized flow design (no dead flow zones, low friction)/ 流动优化设计 (无流动死区, 低摩擦)

Simple mounting and demounting/安装拆卸简单

Specification/规格

Hard metal pins up to 70mm / larger than 70mm hard surfacing by build up welding/硬金属针直到 70mm /大于 70mm 通过堆焊表面硬化

High alloy steel screw tip check ring and seat ring/高合金钢三小件

Also powder metallic check ring and seat ring available/粉末冶金推力环阀座也可用

4 part non return valve with pilot ring/4件套止逆阀带先导环

Application/应用

Applications with high requirements on closing behavior and reproducibility of non return valve also with small or even no screw suck back/应用于止逆环关闭要求高和重复度高的或者小的甚至螺杆不后抽的情况

Limitations: applications with high mass flow rates during plasticizing/限制: 那些预塑过程中高熔体流速的应用

Features/特点

Very exact and reproducible closing/非常准确和高重复度关闭

Very good sealing during injection and holding pressure/注射保压阶段有很好的密封

Optimized flow design (no dead flow zones, low friction)/优化的流动设计 (无流动死角, 低摩擦)

Simple mounting and demounting/安装拆卸简单

Specification/规格

Additional pilot ring/额外的先导环

Hard metal pins/硬金属针

High alloy steel screw tip check ring and seat ring/高合金工具钢螺杆头止逆环密封环

35mm to 110mm

ball non return valve/球状止逆环

Application/应用

Fast cycling applications with low to middle viscous polyolefins i. e. packaging applications/快周期应用 中低粘度的聚烯烃比如包装行业

Limitations/限制:

-Shear sensitive materials/剪切敏感材料

-Materials which tend to build up deposits on the plasticizing components/那些能在塑化元件上产生沉积物的材料

-Fiber or ball reinforced polymers/纤维或球状增强聚合物

-Highly filled polymers/高充填聚合物

Features/特点

Exact and fast closing/准确快速关闭

Recommended for low viscous polymers in fast cycling applications/推荐用于低粘度聚合物并且快周期的应用

In processing low viscous polyolefins i. e. PP low wear/加工低粘度聚烯烃 比如低磨损的pp

Specification/规格

High alloy tool steel through hardened/高合金工具钢全硬化

if you need any support , please feel free to contact DEMAG team on your side

如果您需要任何支持，敬请联系您身边的德马格团队