Removable Nozzle Tip Assembly for Mold-Gate Heating Control
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Solution Overview
Problem
Existing nozzle tips in injection molding machines often have torque features that hinder efficient heat transfer and thermal control near the mold gate, leading to poor thermal profiles and inconsistent melt consistency due to the heater's positioning away from the mold gate and inaccurate temperature sensing.
Innovation Solution
A removable nozzle tip with a concentric cylindrical design and a threadable attachment mechanism, combined with a tubular heater and thermocouple positioned close to the mold gate, eliminates torque features downstream of the heater, allowing for improved thermal control and accurate temperature sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If torque features (wrench flats, hex, or 12-point sockets) are included on the nozzle tip, then assembly and removal of the nozzle tip are facilitated, but heat transfer from the nozzle heater to the nozzle tip is prevented and the heater must be positioned away from the mold gate
Solution Approach 1:
The engagement tool is divided into separate functional components: a body that engages the cylindrical surface of the nozzle tip, and a removable torque feature that can be attached to the body. This segmentation allows the torque feature to be present during installation/removal operations but removed during heating operations, thus resolving the contradiction between ease of operation and thermal performance
Solution Approach 2:
The torque feature is made dynamic by designing it as a removable component that can be attached to the engagement tool body when needed for assembly/disassembly operations, and removed when needed for optimal heating. This dynamic configuration allows the system to adapt between two operational states: one requiring mechanical engagement and one requiring thermal efficiency
2Ease of operation
If the heater is positioned away from the mold gate to accommodate torque features, then torque features can be included on the nozzle tip, but temperature control of the gate area becomes poor
Solution Approach 1:
By separating the engagement tool into a body and a removable torque feature, the system allows the heater to be positioned optimally near the mold gate during operation, while still providing torque features when needed for maintenance. The torque feature is only present during assembly/disassembly, not during the heating process
Solution Approach 2:
The torque feature is attached to the engagement tool body in advance of the heating operation, allowing assembly and removal to proceed with full torque capability. Before heating begins, the torque feature is removed and the heater is positioned close to the mold gate, ensuring optimal temperature control for the subsequent molding operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances thermal performance and melt consistency at the mold gate by ensuring the heater and thermocouple are in close proximity, resulting in better control over the molten plastic's temperature and consistency.
Implementation Method 1
The hot runner system is an assembly of heated components and the heat serves to maintain the molten plastic at a desired consistency
Implementation Method 2
enhances thermal performance and melt consistency at the mold gate by ensuring the heater and thermocouple are in close proximity
Implementation Method 3
The nozzle assembly may further include a thermocouple positioned close to the mold gate
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
The present application describes injection molding machines and, more particularly, a removable nozzle tip and nozzle assembly for use with an injection molding machine and an engagement tool and methods for replacing a nozzle tip. In an aspect, an injection molding machine may include a nozzle. The nozzle may include a nozzle housing and a nozzle tip threadably attached to the nozzle housing. At least a portion of an exterior wall of the nozzle housing and at least a portion of an exterior wall of the nozzle tip may align to provide a cylindrical surface. The injection molding machine may further include a tubular heater enclosing at least a portion of the continuous cylindrical surface. The nozzle tip does not include a torque feature in any location that is downstream of the tubular heater and upstream of a mold gate of the nozzle.