Temperature-Regulating Nozzle for 3D Bioprinting Clogging
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Solution Overview
Problem
Dispensing systems face challenges in maintaining precise temperature control over long periods, leading to clogging issues due to temperature-sensitive materials stiffening in the nozzle when not in use, affecting accuracy and precision in 3D bioprinting and other applications.
Innovation Solution
A dispensing system with a temperature-regulating unit that moves the nozzle and material cartridge between positions to maintain temperature stability within a range of -10°C to 120°C, using a Peltier element and heat-transferring elements like fans or liquid coolants to prevent clogging by cooling or heating the nozzle before, after, and between dispensing actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the dispensing system uses temperature-sensitive materials that require precise temperature control, then the dispensing accuracy and precision are improved, but the risk of clogging increases when the nozzle is idle
Solution Approach 1:
The system performs preliminary cooling or heating of the nozzle before dispensing begins, and maintains temperature regulation during idle periods. This preliminary action prevents material stiffening and clogging before they occur, while ensuring the nozzle is at the correct temperature for precise dispensing when operation resumes.
Solution Approach 2:
The temperature-regulating unit continuously monitors the nozzle temperature and adjusts heating or cooling accordingly. This feedback mechanism maintains precise temperature control during dispensing to ensure accuracy, while automatically preventing clogging by maintaining temperature within the optimal range during idle periods.
2Reliability
If the nozzle is kept at a constant temperature during idle periods, then clogging is prevented, but energy consumption increases
Solution Approach 1:
Instead of continuous temperature regulation during idle periods, the system uses periodic or intermittent heating/cooling cycles. The temperature-regulating unit activates only when needed to maintain temperature within the optimal range, rather than continuously, thereby preventing clogging while reducing energy consumption during idle periods.
Solution Approach 2:
The system changes the temperature regulation strategy based on the operational state. During idle periods, the temperature is maintained within a broader range that prevents clogging without requiring continuous regulation. During active dispensing, the temperature is precisely controlled within a narrower range for optimal dispensing accuracy, thereby reducing overall energy consumption.
3Duration of action of moving object
If the system uses heating elements to prevent clogging, then the dispensing continuity is improved, but the temperature control precision deteriorates
Solution Approach 1:
The system uses an intermediary temperature-regulating unit that acts as a mediator between the heating/cooling elements and the nozzle. This intermediary component provides precise temperature control by regulating the heat transfer, thereby maintaining dispensing continuity while preserving temperature control precision through controlled heat addition or removal.
Solution Approach 2:
The system dynamically changes the temperature regulation parameters based on the dispensing state. During idle periods, the temperature is maintained within a range that prevents clogging. During active dispensing, the temperature is precisely controlled within a narrower range optimized for dispensing accuracy, thereby achieving both continuity and precision through adaptive parameter adjustment.
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 effectively reduces clogging and maintains precise temperature control, ensuring consistent dispensing of both temperature-sensitive and temperature-requiring materials, enhancing the accuracy and longevity of the dispensing process.
Implementation Method 1
using a Peltier element and heat-transferring elements like fans or liquid coolants to prevent clogging by cooling or heating the nozzle
Implementation Method 2
heat-transferring elements like fans or liquid coolants to prevent clogging by cooling or heating the nozzle
Data Source
Figure 1a~2c
Figure 3a~3b
Figure 4a~4b
AI summary
A dispensing system (1) comprising a material cartridge (2) provided with a nozzle (3), a temperature-regulating unit (4) provided with a nozzle temperature-regulating zone (5) arranged to regulate the temperature of the material cartridge nozzle (3) when the material cartridge nozzle (3) is arranged within the nozzle temperature-regulating zone (5), and a positioning unit (6) arranged for movement of the material cartridge (2) and the nozzle temperature-regulating zone (5) relative to each other between a first position (A) and a second position (B). In the first position (A) the material cartridge nozzle (3) is arranged within the nozzle temperature-regulating zone (5), and in the second position (B) at least a leading end portion (3a) of the material cartridge nozzle (3) is arranged outside the nozzle temperature-regulating zone (5).