Co-Injection Manifold with Independent Temperature Control
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Solution Overview
Problem
Conventional co-injection manifolds are inadequate for processing dissimilar materials like wood or cellulose materials, which require different temperatures than plastic materials, leading to potential clogging or degradation due to incompatible temperature settings.
Innovation Solution
A co-injection manifold with separately controllable temperature control elements for each passage allows for the independent regulation of temperatures, enabling the concurrent injection of plastic and wood or cellulose materials at their respective optimal molten states, using a valve pin and temperature control systems to manage material flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single common temperature is used for the co-injection manifold, then plastic material can be maintained in a desired molten state, but wood or cellulose material will be degraded or cause clogging due to incompatible temperature
Solution Approach 1:
The co-injection manifold is divided into separate temperature control zones with independently controllable heating elements. Each zone can maintain different temperatures suitable for different materials (plastic and wood/cellulose), allowing simultaneous processing without mutual interference. This segmentation resolves the temperature incompatibility by providing material-specific thermal environments within a single manifold system.
2Adaptability or versatility
If separate temperature controls are implemented for different passages, then dissimilar materials can be processed at their optimal temperatures, but device complexity increases
Solution Approach 1:
The manifold design integrates multiple temperature control zones into a single unified structure that handles both plastic and wood/cellulose materials through common injection passages. The valve system and heating elements are combined in one assembly, allowing the manifold to perform multiple material processing functions without requiring separate injection systems. This multi-functionality achieves material versatility while controlling overall device complexity.
3Productivity
If wood or cellulose material is heated to the same temperature as plastic material, then both materials can be injected through the common manifold, but the wood material will be degraded or cause clogging
Solution Approach 1:
Different passages or zones within the manifold are assigned different temperature qualities optimized for specific materials. The plastic material passage is maintained at higher temperatures suitable for plastic melting, while the wood/cellulose passage is kept at lower temperatures appropriate for cellulose materials. This local differentiation of thermal properties enables productive co-injection while preventing the harmful effects of temperature mismatch.
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 solution ensures the successful co-injection of dissimilar materials, preventing degradation and clogging, and producing molded articles with desirable features from both the core and outer skin materials.
Implementation Method 1
separately controllable temperature control elements to independently control a temperature within each of the first and second passages
Implementation Method 2
The valve pin is moveable axially within the bore by way of a plunger
Data Source
AI summary
A co injection manifold assembly for injecting two different materials into a common mold cavity includes a housing that defines a first passage, a second passage and an outlet. The first and second passages communicate with a bore having a valve member for controlling flow of the material through the outlet. A first temperature control element in thermal contact with the first passage and a second temperature control element are in thermal contact with the second passage. Each of the first and second temperature control elements are separately controllable to provide separate temperatures for each of the first and second passages. Separate temperatures in each of the first and second passages provide for the use of materials having dissimilar molten temperatures.