日期：2021-12-13
Plasticisingcomponents to meet your requirements
滿足你需求的塑化組件
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.
螺桿頭擔負著塑化、注塑、保壓等主要工藝步驟，其結構設計又受原料特性和產(chǎn)品特性影響?？梢哉f，如果螺桿頭的選擇不合理，就會直接影響產(chǎn)品的效率和品質(zhì)。今天，我們就來講講螺桿頭。
Non return valve – flow cross sections/止逆閥 – 流動截面
Click to enlarge the picture for more details/點擊放大圖片查看詳情
Shear sensitive material/剪切敏感材料
Application of general purpose ring non return valve (standard)/應用通用止逆閥(標準)
Ifeven larger flow cross sections are required →a ring non return valve with increased flow cross sections can be used/如果需要更大的流動截面→可以使用加大的止逆閥
If no ring non return valve can be used due to shear rate i. e. PVC-U→PVC-U screw tip is recommended/如果根據(jù)剪切速率沒有環(huán)形止逆閥可以用 比如 PVC-U→推薦PVC-U螺桿頭
Design of PVC screw tip avoids excessive back flow during injection/PVC螺桿頭設計避免了注射過程過多的回流
As less as possible shear stress for the processed material/加工材料以盡可能小的剪切力
Large flow cross sections/大的流動截面
No diversion of melt/沒有熔體的轉移
No dead flow zones/沒有流動死點區(qū)域
Ring non return valve/環(huán)形止逆閥
Application/應用
General purpose non return valve for a very wide range of application/通用止逆閥適用大部分的應用
Features/特點
Exact and reproducible closing/精準可重復關閉
Good sealing during injection and holding pressure/注射保壓密封效果好
Low wear/磨損緩慢
Optimized flow design (no dead flow zones, low friction)/ 流動優(yōu)化設計 (無流動死區(qū), 低摩擦)
Simple mounting and demounting/安裝拆卸簡單
Specification/規(guī)格
Hard metal pins up to 70mm / larger than 70mm hard surfacing by build up welding/硬金屬針直到 70mm /大于 70mm 通過堆焊表面硬化
High alloy steel screw tip check ring and seat ring/高合金鋼三小件
Also powder metallic check ring and seat ring available/粉末冶金推力環(huán)閥座也可用
4 part non return valve with pilot ring/4件套止逆閥帶先導環(huán)
Application/應用
Applications with high requirements on closing behavior and reproducibility of non return valve also with small or even no screw suck back/應用于止逆環(huán)關閉要求高和重復度高的或者小的甚至螺桿不后抽的情況
Limitations: applications with high mass flow rates during plasticizing/限制: 那些預塑過程中高熔體流速的應用
Features/特點
Very exact and reproducible closing/非常準確和高重復度關閉
Very good sealing during injection and holding pressure/注射保壓階段有很好的密封
Optimized flow design (no dead flow zones, low friction)/優(yōu)化的流動設計 (無流動死角, 低摩擦)
Simple mounting and demounting/安裝拆卸簡單
Specification/規(guī)格
Additional pilot ring/額外的先導環(huán)
Hard metal pins/硬金屬針
High alloy steel screw tip check ring and seat ring/高合金工具鋼螺桿頭止逆環(huán)密封環(huán)
35mm to 110mm
ball non return valve/球狀止逆環(huán)
Application/應用
Fast cycling applications with low to middle viscous polyolefins i. e. packaging applications/快周期應用 中低粘度的聚烯烴比如包裝行業(yè)
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產(chǎn)生沉積物的材料
-Fiber or ball reinforced polymers/纖維或球狀增強聚合物
-Highly filled polymers/高充填聚合物
Features/特點
Exact and fast closing/準確快速關閉
Recommended for low viscous polymers in fast cycling applications/推薦用于低粘度聚合物并且快周期的應用
In processing low viscous polyolefins i. e. PP low wear/加工低粘度聚烯烴 比如低磨損的pp
Specification/規(guī)格
High alloy tool steel through hardened/高合金工具鋼全硬化
if you need any support , please feel free to contact DEMAG team on your side
如果您需要任何支持，敬請聯(lián)系您身邊的德馬格團隊
