Nozzle Heater for Fluid Dispensing Temperature Control
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Solution Overview
Problem
Current fluid dispensing systems face challenges in maintaining nozzle temperatures, leading to adhesive cooling and subsequent thickening, restricted flow, and potential nozzle plugging due to inadequate thermal conduction and superheated air usage.
Innovation Solution
A fluid dispensing system with a nozzle heater that maintains the nozzle at a predetermined temperature independent of the adhesive and air temperatures, using a directly attached, independently controlled heating device to ensure consistent adhesive flow and application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal conduction from the applicator service block and superheated air are used to maintain nozzle temperature, then the system structure is simple, but the nozzle temperature drops by more than 100°F (38°C) below the desired set temperature
Solution Approach 1:
The heating system is segmented into multiple independent heating zones: a service block heater for the applicator service block, a nozzle heater for direct nozzle heating, and an air heater for superheated air supply. Each heater is independently controlled to maintain precise temperature profiles in different regions of the system, resolving the temperature drop issue while keeping each individual heating component relatively simple.
Solution Approach 2:
A temperature sensor is introduced as an intermediary element to monitor the actual nozzle temperature and provide feedback to the control system. This enables closed-loop control where the heating systems automatically adjust their output to maintain the desired nozzle temperature, compensating for the inherent heat losses without requiring overly complex heating hardware.
2Productivity
If the volume of air through the nozzles is increased to maintain high output, then productivity increases, but the nozzle temperature drops significantly
Solution Approach 1:
The service block heater and nozzle heater are activated before adhesive dispensing begins and continue to operate throughout the dispensing process, pre-heating the adhesive and maintaining nozzle temperature in advance. This preliminary and continuous heating action ensures that even when high volumes of air pass through the nozzles during high-productivity operation, the adhesive remains at the required temperature for proper flow and application.
Solution Approach 2:
The system independently controls multiple temperature parameters: the service block temperature, the nozzle temperature, and the superheated air temperature. By adjusting these parameters independently based on operating conditions, the system can maintain optimal adhesive temperature even when air flow volume increases for high-speed production, resolving the contradiction between productivity and temperature maintenance.
3Duration of action of stationary object
If adhesive is stagnant in the valve module and nozzle for extended periods, then the system can be inactive, but the adhesive cools and thickens causing restricted flow and potential plugging
Solution Approach 1:
The service block heater and nozzle heater operate continuously throughout both active dispensing periods and inactive periods, maintaining the adhesive and nozzle at the required temperature at all times. This continuous heating action prevents the adhesive from cooling and thickening during system inactivity, ensuring that when dispensing resumes, the adhesive flows properly without restriction or plugging, thereby maintaining reliability during and between operational cycles.
4Device complexity
If a single heating system is used for both the applicator service block and nozzle, then the device complexity is reduced, but the temperature control precision is insufficient
Solution Approach 1:
The heating system is divided into separate, independently controlled heating elements: a service block heater for the applicator service block and a nozzle heater for the nozzle. Each heater has its own control circuit and temperature sensor, allowing independent optimization of temperature profiles in different regions. This segmentation enables precise temperature control at the nozzle where it is most critical, while maintaining simpler individual heater designs that would be insufficient if combined into a single system.
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 system effectively prevents adhesive cooling, maintaining fluidity and preventing nozzle plugging, thereby ensuring consistent adhesive application patterns and extended system uptime.
Implementation Method 1
a nozzle heater to maintain the nozzle at a third predetermined temperature independent of the first and/or second predetermined temperatures
Implementation Method 2
a first heater for heating the first fluid to a first predetermined temperature
Implementation Method 3
a second heater for heating the second fluid to a second predetermined temperature
Implementation Method 4
The air heat exchanger is incorporated into the applicator assembly to further assure nozzle temperatures are maintained by flowing superheated air through the nozzles
Implementation Method 5
The maintenance of nozzle temperature is accomplished via conduction of heat from the glue applicator service block, through the valve module to the nozzle assembly
Data Source
AI summary
A fluid dispensing system includes a first fluid supply device for supplying a first fluid, a second fluid supply device for supplying a second fluid, a first heater for heating the first fluid to a first predetermined temperature and a second heater for heating the second fluid to a second predetermined temperature. The dispensing system further includes a nozzle for dispensing the first fluid and the second fluid, the nozzle dispensing the first fluid and the second fluid in intimate contact with one another, the first and second fluids being dispensed at a dispensing temperature, and a nozzle heater, the nozzle heater maintaining the nozzle at a third predetermined temperature independent of the first and/or second predetermined temperatures.