Pressure Disc Load Distribution in Injection Molding Sealing
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Solution Overview
Problem
Injection molding apparatuses face issues with improper loading, leading to component damage and molding material leakage due to heat expansion and manufacturing pre-loads, which existing technologies fail to adequately address.
Innovation Solution
The injection molding apparatus incorporates a back plate, mold plate, manifold, nozzle, and actuator system with pressure discs and supports to balance and transmit loads, ensuring proper sealing and alignment, and accommodating thermal expansion through flexible design elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the injection molding apparatus is loaded to connect and seal components, then sealing is improved, but component damage and material leakage occur due to improper loading and heat expansion
Solution Approach 1:
The patent introduces a pressure disk that changes the loading parameters by distributing forces more evenly across the back plate. This parameter change in force distribution prevents localized stress concentrations that cause component damage while maintaining proper sealing under thermal expansion conditions
Solution Approach 2:
The pressure disk acts as an intermediary element between the actuator and the back plate. It mediates the loading forces, converting concentrated actuator forces into distributed pressures that safely connect components without causing damage or leakage
2Ease of manufacture
If manufacturing pre-load and heat expansion forces are applied, then assembly is simplified, but improper loading causes component damage and leakage
Solution Approach 1:
The pressure disk modifies the force distribution parameters, ensuring that manufacturing pre-load and heat expansion forces are distributed evenly across the back plate rather than concentrating at specific points. This maintains sealing reliability while simplifying the assembly process
3Stability of the object's composition
If a rigid connection structure is used, then structural stability is improved, but thermal expansion causes improper loading and leakage
Solution Approach 1:
The pressure disk changes the mechanical parameters of the connection by providing a compliant interface that accommodates thermal expansion. This maintains structural stability while allowing for thermal movement without causing leakage or component damage
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
This configuration effectively balances internal loads, reduces leakage, and maintains tight sealing of components, even under thermal expansion, thereby preventing damage and ensuring reliable operation.
Implementation Method 1
accommodating thermal expansion through flexible design elements
Implementation Method 2
A second support disposed between the back plate and the actuator transmits a second load between the back plate and the manifold
Data Source
AI summary
An actuator is disposed between a back plate and a manifold and is connected to a valve pin. A nozzle flange, locating ring, or pressure disc can transmit a first load between the manifold and a mold plate. A pressure disc can be disposed between the actuator and the back plate. The pressure disc transmits a second load between the back plate and the manifold through the actuator.