Overview

This document details the technical specifications and configuration guidelines for the Series GB N ... S single nozzles featuring valve gate technology, designed for hot runner injection molding systems. The nozzles have a 16 mm flow bore diameter, external heating with integrated Fe/CuNi thermocouples, and support various thermoplastics.

Product Specifications

• Nozzle Type: Single nozzle with valve gate
• Flow Bore Diameter: 16 mm
• Heating: External, 230 V AC, Fe/CuNi thermocouple (DIN 43710)
• Heating Zones: 2 to 3 zones, power ranging from 1080 to 1810 W depending on nozzle length and tip
• Material Compatibility: Suitable for all common thermoplastics
• Maximum Shot Weight: Up to 1500 g per nozzle for low viscosity materials
• Cooling Requirements: Mandatory cooling around and opposite the nozzle tip for mold temperatures above 80°C

Nozzle Tip Variants and Gating Types

The nozzle tips are modular screw-in parts allowing different shapes optimized for various processing windows. The valve gate gating type is standard. Available tip shapes include:

• Y and L Shapes: Suitable for narrow to medium process windows
• S and V Shapes: Suitable for medium to wide process windows
• W Shape (Versions 01 & 02): For medium to wide process windows; Version 02 designed for limited installation space

Dimensional and Mechanical Details

• Extensive dimensional data provided including nozzle length codes, mold plate cut-outs, head diameters, centering depths, and contact radii/angles
• General tolerances conform to DIN ISO 2768-mK standards for shape, position, and surface finish
• Mechanical features include locking pin grooves/bores to prevent nozzle rotation and precise cut-outs for nozzle and connections

Heating and Cooling Parameters

• Heating zones numbered from nozzle tip to head with power adjusted by length and tip shape
• Cooling is required for mold temperatures above 80°C, specifically around and opposite the nozzle tip

Installation and Application Notes

• Nozzle tip front must always contact the plastic melt
• Tip shape selection depends on material process window and application needs
• Refer to Synventive Hot Runner Guide for detailed design and application instructions
• Illustrations are schematic; consult Synventive for specific applications

Summary of Critical Parameters

Recommendations and Best Practices

• Ensure proper cooling when mold temperatures exceed 80°C to maintain nozzle performance and longevity
• Select nozzle tip shape based on the material’s processing window to optimize flow and gating
• Use locking pins to secure nozzles against rotation during operation
• Consult Synventive Hot Runner Guide for comprehensive design and application details
• Verify dimensional tolerances and mold cut-out specifications carefully during design and ordering

Nozzle Specification and Configuration Guide

1. Overview and Purpose

Provides instructions and variables for specifying and configuring valve gate injection molding nozzles, including length codes, dimensional tolerances, and design parameters to tailor nozzles to specific applications.

2. Nozzle Series, Types, and Length Codes

Nozzles are categorized by series and type with associated length codes corresponding to physical dimensions (lengths, heights, radii). Tables list these dimensions in millimeters to aid accurate selection based on mold design.

3. Dimensional Tolerances and Standards

Manufacturing tolerances follow DIN ISO 2768-mK standards, ensuring consistent quality. Specific tolerances cover shape, position, and surface finish critical for proper nozzle fit and function.

4. Nozzle Tip and Gating Types

Tip shapes are identified by codes (e.g., X01) and designed for various processing windows. Valve gate is the primary gating type, with cooling required around or opposite the tip to maintain temperature control.

5. Design Variables and Configuration Procedure

Users select variables such as length codes and heater power ratings from provided drawings and tables to customize nozzles. Offset drawings and schematics support this process.

6. Additional Technical Information

Includes groove and bore dimensions for locking pins and mold plate cut-outs for nozzle and connections to ensure secure mechanical integration.

7. Contact and Support Information

Synventive representatives worldwide provide technical support. Users are encouraged to consult the Synventive Hot Runner Guide for detailed design and application information.

Critical Points and Best Practices

• Strictly adhere to DIN ISO 2768-mK tolerances for dimensional accuracy
• Carefully select nozzle length codes to match mold and processing needs
• Ensure proper cooling arrangements around valve gate nozzles
• Consult manufacturer guides and technical support for application-specific configurations
• Verify all dimensional and functional parameters before ordering

Conclusion

The Series GB N ... S single nozzles with valve gate technology provide versatile, modular configurations suitable for a wide range of thermoplastic injection molding applications. Their precise dimensional standards, controlled heating zones, and modular tip designs enable optimized processing. Proper cooling and installation practices are essential for reliable and efficient operation.