Machine nozzle with needle shut-off type-A(S)
Machine nozzle with needle shut-off type-A(S)
The machine nozzle with needle shut-off type A(S) is designed for processing thermoplastics, excluding PVC. It operates with a high-performance spring mechanism, suitable for low viscosity materials like PA, PPS, PE, POM, and PP. The nozzle is primarily used in industries such as packaging, automotive, leisure, medical, and electronics.
Operation:
The nozzle opens at 200 bar due to injection pressure and closes when the pressure drops below 80 bar. The spring holds the needle in a closed position, preventing material leakage and ensuring a clean shut-off of the melt stream. The nozzle size is determined by the injection rate per second.
Advantages:
- Prevents stringing and drooling.
- Shorter cycle times and increased productivity.
- Improved process reliability and repeatability.
- Easy installation and add-on capability.
Disadvantages:
- Dependent on melt pressure for operation.
- Requires periodic cleaning.
- Spring is a wear part.
Options:
An integrated melt filter can be added to the nozzle, using a gap filter principle with filter gaps of 0.3 mm, 0.5 mm, and 0.8 mm. Retrofitting is possible by replacing the standard spring chamber with a filter-spring chamber.
Specifications:
The nozzle can operate at a maximum pressure of 2000 bar at 350°C. Standard tip lengths and orifice sizes vary, with options for temperature sensors and abrasion protection for tips.
Customer Information:
Additional information may be required for non-standard requirements, and customer service is available for assistance.
Catalog excerpts
Machine nozzle with shut-off, type A(S) Technical description The spring actuated machine needle shut-off nozzles type A(S) are used in processing of thermoplastics, principally with low viscosity materials such as: PA, PPS, PE, POM, PP. Needle Needle Sleeve Finds application in: Packaging, automobile and leisure industries, medicinal and electronic equipment. Operation: The nozzle is opened directly from the injection pressure and closed again with spring power. A needle which moves axially in the needle shut-off nozzle is held in the closed position by the force of the spring. The nozzle orifice...
Open the catalog to page 2
Machine nozzle with shut-off, type A(S) Option: Integrated melt filter in A-Type nozzle General For a problemfree production process (keeping the injection opening clear) a final filtration of the material may be needed. The Herzog® melt filter is based on the so called „ gap filter principle“and can be assembled into the existing spring operated shut-off nozzle without any modification. Filter gap: A0 → 0.3 mm A1 → 0.5 mm A2 → 0.8 mm Retrofitting Just by changing the standard spring chamber with a filter-spring chamber the retrofit is already done and the nozzle is again operational. Nozzle...
Open the catalog to page 3
Machine nozzle with shut-off, type A(S) Dimension sheet for enquiries or orders Machine needle shut-off nozzle type A(S), spring operated Company: Contact person: Street: Tel.: City/Zip: Fax: Country: E-Mail: Operating data and standard dimensions max. injection rate cm3 / s based on Polystyrene (PS) A0 A1 A2 3 flow channel (cm ) approx. screw diameter in mm 45 500 20 50 1600 130 to approx. 20 to approx. 50 to approx. 120 contact force in kN max. 30 max. 70 max. 120 back pressure (opening pressure) 200 bar 200 bar 200 bar 2000 bar at 350°C 2000 bar at 350°C 2000 bar at 350°C standard tip length...
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