Printing Material Flow Control Using Plunger Distance Feedback
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Solution Overview
Problem
Existing manufacturing devices for multidimensional printing lack precision in controlling the flow rate of materials, are non-transparent, and result in material wastage, making them cost-inefficient and lacking quality control.
Innovation Solution
A system comprising a pressure source, cartridge with a plunger, distance sensor, and processor that calculates and controls the required distance between the cartridge adapter and plunger to regulate pressure for precise flow rate control, eliminating the need for external sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure-based pump device with a non-transparent cartridge assembly is used, then material can be extruded, but the user cannot visualize the plunger movement or position
Solution Approach 1:
The cartridge assembly is made transparent or translucent, allowing visual detection of plunger movement and material level without requiring additional sensors. This transparency enables direct observation of the extrusion process while maintaining pressure-based material delivery.
2Ease of operation
If a stepper motor is used to control the plunger, then linear displacement can be controlled, but the flow rate cannot be manipulated for multiple materials
Solution Approach 1:
The system transitions from fixed stepper motor control to dynamic pressure control, where the pressure applied to the plunger can be continuously adjusted. This enables flexible flow rate manipulation adapted to different material viscosities and printing requirements, while the transparent cartridge allows real-time monitoring of plunger movement.
Solution Approach 2:
The control approach changes from discrete stepper motor steps to continuous pressure parameter adjustment. By varying pressure magnitude and duration, the system can precisely control flow rates for different materials with different rheological properties.
3Measurement precision
If external flow meters or sensors are used during extrusion, then flow rate measurement is attempted, but material wastage increases and cost-efficiency decreases
Solution Approach 1:
The transparent cartridge assembly serves its own measurement function by allowing direct visual monitoring of plunger position and material consumption. This eliminates the need for external flow meters or sensors, preventing material wastage associated with these devices while providing sufficient measurement capability for process control.
Solution Approach 2:
External flow meters and sensors are removed from the system. The patent recognizes that for many printing applications, visual monitoring through the transparent cartridge provides adequate measurement without the complexity and material consumption of external sensing devices.
4Measurement precision
If external sensors are used for flow rate measurement, then some measurement capability is provided, but precision and quality control over material extrusion are insufficient
Solution Approach 1:
The transparent cartridge enables real-time visual feedback on plunger position, material level, and extrusion progress. This continuous visual monitoring allows operators to immediately detect and correct deviations in material flow, ensuring consistent printing quality without requiring complex external sensing systems.
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 accurate and efficient control of material flow, prevents wastage, and reduces costs by using a feedback loop with a distance sensor and processor, ensuring precise dispensing without external sensors.
Implementation Method 1
a distance sensor operable to measure a distance (D) between the cartridge adapter and the plunger
Implementation Method 2
control the pressure source to regulate a pressure to move the plunger to be at the required distance (D′) from the cartridge adapter at a defined speed to control the rate of flow of the printing material
Data Source
AI summary
A system for controlling rate of flow of printing material in dispensing system. The system includes a pressure source configured to provide pressure for dispensing of printing material; cartridge configured to hold printing material with a plunger for displacing printing material; cartridge adapter coupled to first end of cartridge; distance sensor operable to measure distance (D) between cartridge adapter and plunger; cartridge outlet configured to dispense printing material; and processor operatively coupled to pressure source and distance sensor, wherein processor is configured to utilize predefined set of parameters related to cartridge and control pressure source to regulate pressure to control rate of flow of printing material.