Thermo-regulated Metering Device for Polymer Additive Dosing
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Solution Overview
Problem
Current plastics material transformation processes face challenges in maintaining precise addition of liquid additives, such as dyes, due to variability in temperature and flow rate, leading to inconsistent coloration and product rejection.
Innovation Solution
A plastics material transformation plant equipped with a metering device that includes a container for the liquid additive, a peristaltic pump, and a thermo-regulation system to maintain the additive's temperature within a narrow range, ensuring consistent mass flow rate and reducing the need for manual adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a peristaltic metering pump is used to add liquid additive to polymer material, then the volume flow rate is constant, but the mass flow rate varies with temperature causing coloration inconsistency
Solution Approach 1:
The patent applies parameter changes by controlling the temperature of the liquid additive to maintain constant density. The system includes a temperature control unit that regulates the additive temperature, ensuring that the mass flow rate remains constant even though the volume flow rate is already controlled by the peristaltic pump. This dual control of volume and temperature parameters resolves the contradiction between volume flow constancy and mass flow stability.
2Manufacturing precision
If manual intervention is used to adjust metering pump flow rate, then coloration variability can be reduced, but productivity decreases due to frequent adjustments
Solution Approach 1:
The patent implements a feedback control system where a temperature sensor continuously monitors the additive temperature and feeds this information back to the temperature control unit. This closed-loop feedback automatically adjusts the heating element to maintain constant temperature, eliminating the need for manual flow rate adjustments while maintaining consistent coloration, thus resolving the contradiction between precision and productivity.
Solution Approach 2:
The system performs self-regulation through the automatic temperature control mechanism. The temperature control unit autonomously maintains the additive temperature within a specified range without requiring operator intervention, allowing the system to self-correct any temperature variations that would affect mass flow rate and coloration consistency.
3Manufacturing precision
If additive temperature is not controlled, then device complexity is low, but mass flow rate varies causing product rejection
Solution Approach 1:
The patent introduces temperature as a controlled parameter with a specified range (e.g., 20±2°C). By defining and maintaining this temperature parameter, the system ensures constant additive density and mass flow rate. The temperature control unit, heating element, and sensor create a manageable complexity that directly addresses the dosage precision requirement.
Solution Approach 2:
The temperature control unit acts as an intermediary between the additive container and the metering pump. It mediates the temperature variations that would otherwise directly affect the additive density and mass flow rate, providing a buffer that stabilizes the dosing process without requiring complex modifications to the core metering mechanism.
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
The solution ensures a consistent and precise addition of liquid additives, reducing variability in product coloration and minimizing product rejection by maintaining the additive's temperature and flow rate, thereby improving the overall quality of the transformation process.
Implementation Method 1
a peristaltic pump (5), the intake of which is connected to the container (4) by means of a withdrawal pipe (6) and the delivery of which is connected to the supply pipe (11)
Implementation Method 2
the thermo-regulation system comprises an insulating coating (7) which is provided around the container (4)
Data Source
Figure 1
AI summary
A plastics material transformation plant (100) comprises a transformation machine (10) for the plastics material by means of moulding or extrusion, a feeding hopper (13) which is positioned upstream of the transformation machine and a metering device (1) which is arranged to add a liquid additive to the transformation machine. The metering device (1) comprises a container (4) in which the liquid additive is contained, a metering pump (5) which is connected to the container in order to take the liquid additive and to supply it to the transformation machine (10), and a thermo-regulation system of the liquid additive which is arranged to maintain the temperature of the liquid additive in a range of 2°C more or 2°C less than a predetermined temperature value.