Plastic Processing Pressure Control Based on Residual Humidity
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Solution Overview
Problem
Existing plastic processing plants face challenges in setting accurate set point values for molten state pressures, leading to inefficiencies, increased production waste, and energy consumption due to manual adjustments based on historical data and manufacturer guidelines.
Innovation Solution
A method and apparatus that control molten plastic pressures using real-time humidity measurements from dehumidified solid plastics, adjusting set point values based on residual humidity to optimize processing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment of pressure set point values is performed based on historical data and manufacturer guidelines, then initial pressure settings can be established, but the process requires long refinement time, increases production waste, and raises energy consumption
Solution Approach 1:
The patent implements a feedback control system where the actual injection pressure is continuously measured and compared with the set point value. The controller automatically adjusts the pressure set point based on the difference between actual and target pressure, eliminating manual trial-and-error refinement and significantly reducing adjustment time while maintaining precision.
Solution Approach 2:
The patent replaces manual mechanical adjustment of pressure settings with an automated electronic control system. The controller receives pressure signals from sensors and automatically modifies set point values, substituting human operator intervention with an automated feedback mechanism that operates continuously without time loss.
2Measurement precision
If manual adjustment of pressure set point values is performed based on historical data and manufacturer guidelines, then initial pressure settings can be established, but production waste and energy consumption increase due to prolonged refinement processes
Solution Approach 1:
The feedback control system continuously monitors injection pressure and automatically adjusts set point values to maintain optimal processing conditions. This prevents prolonged operation with suboptimal settings that would cause defective parts and material waste, ensuring precise pressure control from the start of production.
Solution Approach 2:
The control system performs self-adjustment of pressure set points based on real-time feedback without requiring external manual intervention. The controller automatically optimizes processing parameters, preventing production waste by maintaining correct pressure settings continuously without human error or delay.
3Measurement precision
If manual adjustment of pressure set point values is performed based on historical data and manufacturer guidelines, then initial pressure settings can be established, but process stability decreases due to operator dependency and lengthy adjustment periods
Solution Approach 1:
The feedback control system continuously monitors injection pressure and automatically adjusts set point values to maintain optimal processing conditions. This eliminates variability introduced by manual adjustment and ensures consistent, stable pressure control throughout the production process, reducing dependency on operator skill and experience.
4Productivity
If real-time humidity measurement and pressure control is implemented, then rapid and reliable pressure optimization is achieved, but device complexity increases due to additional sensor means and control logic
Solution Approach 1:
The control system integrates multiple functions into a single controller unit that handles both humidity measurement and pressure control. The controller receives signals from both the humidity sensor and pressure sensor, and automatically adjusts pressure set points based on humidity conditions, combining multiple control functions in one device to minimize additional complexity.
Solution Approach 2:
The controller acts as an intermediary that receives input from the humidity sensor and translates it into appropriate pressure set point adjustments. This intermediary component simplifies the overall system architecture by providing a centralized control point that coordinates between different sensors and actuators without requiring complex direct connections between all components.
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
Enables rapid, reliable, and efficient control of molten plastic pressures, reducing waste and energy consumption while improving process stability and efficiency.
Implementation Method 1
sensor means that determines in real time a value of residual humidity of the incoherent solid plastics exiting dehumidifying and/or drying means
Implementation Method 2
dehumidifying and/or drying means connected in fluid communication with the means for performing moulding
Implementation Method 3
means for melting the dehumidified and/or dried solid material
Implementation Method 4
means for melting the dehumidified and/or dried solid material
Implementation Method 5
controlling a pressure of the plastics in molten state... a set point value for controlling the pressure of the molten material is set on the basis of a measured humidity value
Data Source
Figure 1
AI summary
A method and an apparatus are disclosed for processing plastics, in which the material in incoherent solid state is dehumidified in a hopper and is then melted in an extruder, after which the molten material is used in a moulding device for moulding by injection and/or by blow moulding and/or compression, and in which a set point pressure value of the molten material is set on the basis of a measured residual humidity value of the dehumidified incoherent solid material, so as to decrease the pressure value by a preset variation value if the measured residual humidity value is lower than a reference value and to increase the pressure value by a preset variation value if the measured residual humidity value is higher than said reference value.