Back Flow Prevention
Back Flow Prevention
"Positive Shut-off Prior to Injection"
Sodick Plustech eliminates the check ring. Prior to injection, the plasticizing screw is indexed forward creating a positive shut-off (EXACT DOSING). This action prevents any opportunity for backflow of molten material back into the melt stream.
| V-LINE TWO STAGE PLUNGER | RECIPROCATING SCREW |
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| Video: V-LINE TWO STAGE PLUNGER | Video: RECIPROCATING SCREW |
| Back-Flow Function by Screw and Screw Touch Bushing. | Back-Flow Function by Check Ring : Non-return valve. |
| Pre-dosing material by positive shut-off before injection, therefore, it assures constant shot volume. | Check ring's close timing is at while injection (Inconsistent). Screw tips are a source of frictional heat, material hang-ups, intermittent malfunctioning. |
| Material density is stable because screw does NOT retract. | Metered material density is not constant result from uncontrollable balance of "back pressure" and "reciprocating movement". |
| Metered volume = filling volume. | Metered volume is NOT equal to filling volume because there is always leak at check ring. |