Ultrasonic Plastic Feeding With Resistance-Based Melt Control
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Solution Overview
Problem
Existing devices for feeding molten plastic into molding cavities lack precise control over energy application and material flow, leading to inefficiencies and potential degradation of plastic materials during the melting and injection process.
Innovation Solution
A device equipped with a sonotrode and resistance sensors that regulate the movement and vibration frequency of the sonotrode within a melting chamber, using electronic control to adjust parameters such as vibration frequency, movement speed, and pressure based on resistance feedback to ensure precise metering and melting of plastic materials, preventing degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sonotrode is equipped with a static portion inserted into the melting chamber to improve melt flow characteristics, then the plastic material flow is improved, but precise control over energy application and material flow is lost
Solution Approach 1:
The patent applies the dynamics principle by making the sonotrode portion movable rather than static. The translation means enable the sonotrode to move axially within the melting chamber, allowing dynamic adjustment of the insertion depth. This dynamic configuration enables precise control over the volume of plastic material processed and the energy applied, while still maintaining improved melt flow characteristics through direct contact.
Solution Approach 2:
The patent implements feedback control by using resistance sensors to detect the resistance offered by the plastic material to the movement of the sonotrode. This feedback information is used by the control device to regulate the position of the sonotrode and the energy applied, enabling precise control over the melting and injection process while maintaining good melt flow.
2Productivity
If the sonotrode vibrates at high frequency to melt plastic material efficiently, then melting speed is improved, but material degradation may occur due to excessive energy application
Solution Approach 1:
The patent applies partial action by using only the necessary amount of vibration energy required for melting, rather than continuous high-energy vibration. The control device regulates the activation of the ultrasonic transducer based on feedback from resistance sensors, applying energy only when and where needed. This prevents excessive energy application that could cause material degradation while maintaining efficient melting speed.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the vibration frequency and amplitude of the sonotrode based on the detected resistance of the plastic material. The control device modifies the operating parameters of the ultrasonic transducer in real-time, optimizing the balance between melting efficiency and preventing material degradation through precise parameter control.
3Speed
If the sonotrode moves rapidly to drive molten plastic into the molding cavity, then injection speed is improved, but control precision over the injection process is reduced
Solution Approach 1:
The patent uses feedback control through resistance sensors that detect the resistance offered by the molten plastic material during injection. The control device continuously monitors this resistance and adjusts the movement speed and force of the sonotrode in real-time, enabling both high injection speed and precise control over the injection process to ensure accurate filling of the molding cavity.
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 enables precise control over the energy applied to plastic materials, ensuring optimal melting and injection into molding cavities, reducing material degradation and improving the quality of molded parts by accurately measuring resistance and fluidity, and adapting operation parameters accordingly.
Implementation Method 1
The portion of the sonotrode inserted into the melting chamber comes into contact with the solid plastic material deposited therein and is susceptible to melting it by means of ultrasonic vibration produced by the ultrasonic transducer
Implementation Method 2
melting it by means of ultrasonic vibration produced by the ultrasonic transducer and transmitted through said portion of the sonotrode
Implementation Method 3
Relative movement between the sonotrode and the melting chamber, with the plastic material inside the chamber being in molten state, drives said molten plastic material through the outlet opening of the melting chamber
Data Source
AI summary
The device for feeding molten plastic material into a molding cavity (30) includes a melting chamber (20) in which metered solid plastic material is introduced, a sonotrode (10) provided for tightly inserting a portion thereof into said melting chamber (20), causing the plastic material to melt by means of vibration, and relative movement of the sonotrode (10) and melting chamber (20) allows driving the molten plastic material inside a molding cavity (30) communicated with said melting chamber (20), the device including resistance sensors (40) allowing an electronic control device (50) to know the resistance that the plastic material has against the movement of the sonotrode (10).