Injection Valve Nozzle Positioning for Plastic Additive Metering
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Solution Overview
Problem
Existing devices for producing colored plastics, such as polyurethane, have complex structures and require significant effort to change the properties of the plastics, especially when transitioning between different colors.
Innovation Solution
The device incorporates an additional valve unit with a main pipe and a first additional injection valve, where the nozzle tip of the outlet nozzle is positioned in the central region of the flow cross section of the main pipe, preventing the first additive from contacting the inner wall of the main pipe and allowing for easy change between additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If premixing chambers and circulation lines are used for each dye, then different colors can be provided, but the device structure becomes complex
Solution Approach 1:
The patent extracts the dye mixing function from separate premixing chambers and relocates it to a single mixing chamber. The dye is injected directly into the main stream of A component through injection valves positioned at the inlet of the mixing chamber, eliminating the need for complex premixing chambers and circulation lines for each dye.
Solution Approach 2:
The patent merges multiple dye injection functions into a single mixing chamber. Instead of having separate premixing chambers for each dye, the system combines all dye injection points at the inlet of one mixing chamber, simplifying the overall device structure while maintaining the ability to provide different colors.
2Adaptability or versatility
If multiple feed lines and inlets are used for colored polyol, then different additives can be introduced, but the mixing chamber structure becomes complex
Solution Approach 1:
The patent extracts the additive injection function from multiple separate feed lines and consolidates it into injection valves that introduce additives directly into the main stream of A component at the inlet of the mixing chamber. This eliminates the need for multiple complex feed lines opening into the mixing chamber.
3Adaptability or versatility
If dye is stored in premixing chambers, then colored polyol can be provided, but significant effort is required to remove previous dye before using another dye
Solution Approach 1:
The patent extracts the dye storage function from premixing chambers and relocates it to separate dye sources that feed into injection valves. This allows each dye to be independently controlled and injected only when needed, eliminating the need to flush out previous dye from shared premixing chambers.
Solution Approach 2:
The system prepares multiple dye sources in advance, each ready for independent injection. When a color change is needed, the corresponding injection valve is simply switched to the new dye source without requiring preliminary flushing or cleaning of shared chambers, enabling rapid color changes.
4Reliability
If circulation lines are used for each color, then unused material can be recirculated, but the device structure becomes more complex
Solution Approach 1:
The patent extracts the material recirculation function from separate circulation lines for each dye and implements a single recirculation line for the A component in the main stream. Unused A component is recirculated through the injection valves, which ensures consistent mixing and color application without requiring individual circulation systems for each dye.
Data Source
AI summary
The invention relates to a device (1) and method for providing a plastic (2) which is formed from an A component (3) and a B component (4) and optionally from a first additive (6), wherein the device (1) has a mixing chamber (70), in which the A component (3) and the B component (4) are mixed in order to form the plastic (2) and from which the plastic (2) is metered out, and has an additional valve unit (30), which is fluidically connected upstream of an A inlet (71) of the mixing chamber (70) for the A component (3), wherein the additional valve unit (30) has a main pipe (31) for feeding the A component (3) to the A inlet (71) and has a first additional injection valve (33) for feeding the first additive (6) into the main pipe (31), wherein the first additional injection valve (33) has an outlet nozzle (36) opening into the main pipe (31), wherein a nozzle tip (37) of the outlet nozzle (36) lies in a central region of the flow cross section of the main pipe (31), wherein the points of the flow cross section that lie on an inner section of a radial connecting line between a cross section center and an inner wall of the main pipe (31) fall in the central region, wherein the length of the inner section has a value of 90% of the radial connecting line.