Diverter Valve for Continuous Extrusion Material Swapping
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Solution Overview
Problem
Existing molding processes face challenges in swapping extruded materials between mold inputs while maintaining continuous molding, leading to potential material mixing and undesirable product appearance due to bleed-over and mixing in lines between extruder assemblies and the mold.
Innovation Solution
A diverter valve with two inlets and two outlets, configured to switch between states by connecting the first inlet to the second outlet and the second inlet to the first outlet, ensuring continuous flow through all flow paths and recesses, preventing material mixing during transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If connections between extruder assemblies and mold inputs are swapped while molding continues, then material swapping between different colors or textures is achieved, but material mixing occurs in the lines causing defective product appearance
Solution Approach 1:
A diverter valve is introduced as an intermediary device between the extruder assemblies and the mold inputs. The valve provides dedicated flow paths that allow material swapping while maintaining continuous flow, preventing direct mixing of different materials in the lines. The valve body with separate flow channels acts as a mediator that enables material transition without contamination.
Solution Approach 2:
The flow paths within the diverter valve are segmented into distinct channels that prevent mixing of different extruded materials. Each inlet and outlet has its own dedicated flow path, and the valve internally segments the flow to allow switching between materials without cross-contamination in the connecting lines.
2Productivity
If molding continues during material swapping, then productivity is maintained, but dead channels form where material can stagnate causing pressure spikes and defects
Solution Approach 1:
The diverter valve is designed to maintain continuous material flow through all flow paths during operation. During material swapping, the valve ensures that flow continues uninterrupted through active channels, preventing dead zones where material could stagnate. The continuous flow mechanism eliminates pressure spikes and maintains process reliability.
Solution Approach 2:
The valve design preliminarily establishes complete flow path connectivity before material switching occurs. The geometry of the valve body ensures that flow paths are pre-configured to prevent stagnation, and material is directed through active channels before any disconnection occurs, preventing the formation of dead channels.
Data Source
AI summary
A diverter valve for extruded materials, including a split cylinder in the cylindrical opening of a base, each cylinder half being independently pivotable. The base includes first and second inlets for first and second extruded material, and first and second outlets for the material. Base first and second flow paths carry the first and second extruded materials from the inlets to the output openings, and third and fourth flow paths carry extruded material from the first and second first inlet openings to the first and second outlets. The first and second inlet openings and the first and second output openings are axially open to the central opening, and the cylinder halves are adjacent along a plane substantially radial to the central opening axis with each of the cylinder halves including a recess open along the radial plane.