Overview

This document details the technical specifications, design guidelines, and configuration procedures for Synventive Series GB...E single open nozzles used in hot runner systems for thermoplastic injection molding. It covers nozzle types, dimensions, heating zones, gating options, installation, and cooling requirements.

1. Product Description and Classification

• Series: GB...E
• Nozzle Type: Single open nozzles with screw-in tips allowing various shapes and gating types.
• Nozzle Size: 16 mm flow bore diameter.
• Gating Types: Open, open with torpedo, and valve gate (valve gate data separate).
• Application: Suitable for all common thermoplastics; max shot weight per nozzle 2500 g for low viscosity materials.

2. Dimensions and Mechanical Specifications

• Key dimensions include nozzle length (L), cut out lengths (L1), head height (H), and diameters (D, Dt) with tolerances per DIN ISO 2768-mK.
• Mold plate cut outs accommodate nozzle and connections with locking pins to prevent rotation.
• Dimensions vary by nozzle tip shape and gating type.

3. Heating and Temperature Control

• Nozzles are externally heated using 230 V AC supply.
• Heating zones range from 2 to 4, with power ratings between 1200 W and 2430 W depending on nozzle length and type.
• Thermocouples are Fe/CuNi type conforming to DIN 43710 standards.

4. Nozzle Tip Variants and Gating Types

• YT (Shape Y): Open with torpedo, for narrow to medium process windows.
• UT (Shape U): Open with torpedo, for medium to wide process windows.
• FT (Shape F): Open with torpedo, for narrow to medium process windows.
• PT (Shape P): Open with torpedo, for medium to wide process windows.
• KN (Shape K): Open nozzle, suitable for all usual thermoplastics.
• LT (Shape L): Open with torpedo, for narrow to medium process windows.

Each tip shape includes specific dimensional data, heating power requirements, and cooling recommendations.

5. Installation and Cooling Recommendations

• Nozzle tip front must always contact the plastic melt to ensure proper gating.
• Cooling is mandatory around the nozzle tip and on the side opposite the tip to maintain optimal processing temperatures.
• Locking pins secure the nozzle against rotation within the mold plate.

6. Configuration and Specification Procedure

• Users specify nozzles by selecting series, type, length code, and nozzle tip shape based on application needs.
• Length codes correspond to specific nozzle lengths or ranges depending on the series.
• Heating zone power values are provided for each configuration to ensure proper thermal management.
• General tolerances and surface finish requirements follow DIN ISO 2768-mK standards.

7. Reference and Additional Information

• For detailed design and application guidance, refer to the Synventive Hot Runner Guide.
• All illustrations are schematic and not to scale.
• Contact Synventive for specific applications or clarifications.

Critical Parameters and Best Practices

• Ensure nozzle tip is properly seated against plastic to avoid flow issues.
• Adhere strictly to specified heating power and thermocouple standards for temperature control.
• Use locking pins as specified to prevent nozzle rotation and maintain alignment.
• Follow dimensional tolerances strictly to ensure compatibility with mold plates and connections.
• Select nozzle tip shape and gating type based on material process window and application requirements.