Hot Melt Feed System with Adjustable Flow Restrictor
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Solution Overview
Problem
Conventional hot melt dispensing systems face challenges with lengthy start-up times due to large adhesive pellet tanks, which lead to increased charring of adhesive and inefficient melting, as well as issues with maintaining the melted adhesive in a liquid state due to the need for extensive heating across multiple components.
Innovation Solution
A hot melt system incorporating a hopper, melter, pump, venturi feed, and adjustable flow restrictor, where the adjustable flow restrictor regulates the flow of compressed gas to the venturi feed, and a controller manages the operation of these components to efficiently melt and dispense adhesive pellets, including the use of a vibrator to agitate pellets and control the feed rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a large volume tank is used to extend dispensing periods, then the duration of action is improved, but the start-up time increases and manufacturing precision deteriorates due to inefficient melting
Solution Approach 1:
The system divides the adhesive storage into two separate components: a large volume tank for bulk storage and a small volume melter for active melting. This segmentation allows the tank to maintain extended dispensing capacity while the small melter quickly reaches operating temperature, resolving the contradiction between long dispensing duration and short start-up time.
Solution Approach 2:
The venturi feed system acts as an intermediary between the large tank and the melter, enabling efficient pellet transfer. This intermediary mechanism allows rapid feeding of pellets to the small melter, reducing the time required to accumulate sufficient adhesive for dispensing while maintaining the large tank's extended storage capacity.
2Productivity
If heating elements are placed in the tank to melt pellets, then the melting process is improved, but the manufacturing precision deteriorates due to charring from prolonged heat exposure
Solution Approach 1:
The heating function is segmented and concentrated in the small volume melter rather than being distributed throughout the large tank. This localized heating approach improves melting efficiency while minimizing the total heat exposure time for pellets, thereby preventing charring that would occur with prolonged heating in a large tank.
Solution Approach 2:
The system performs preliminary melting in the small melter before dispensing, rather than attempting to melt all pellets in the large tank beforehand. This preliminary action ensures complete melting of only the necessary amount of adhesive, preventing the charring that would result from prolonged heat exposure of the entire pellet supply.
3Stability of the object's composition
If heating elements are placed in the pump and dispenser to maintain liquid state, then the stability of the object's composition is improved, but the device complexity increases
Solution Approach 1:
The heating function is extracted from the pump and dispenser components and consolidated into a dedicated small volume melter. This extraction simplifies the overall system architecture by removing unnecessary heating elements from multiple components while maintaining the stability of the adhesive in liquid form through focused heating in the melter.
4Object-affected harmful factors
If heating elements line the walls of the tank to prevent charring, then the object-affected harmful factors are reduced, but the manufacturing precision deteriorates due to inefficient melting of center pellets
Solution Approach 1:
The tank is segmented into a large storage volume with no heating elements, and a separate small melter with concentrated heating. This segmentation prevents charring in the large tank while maintaining high melting speed in the small melter, as the concentrated heating in the melter efficiently melts pellets without the inefficiencies of wall-heating configurations.
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 configuration reduces start-up times, minimizes adhesive charring, and ensures a continuous supply of liquid adhesive by efficiently melting pellets and maintaining optimal flow rates, thereby improving the overall efficiency and quality of the hot melt dispensing process.
Implementation Method 1
a venturi feed configured to draw the adhesive pellets from the hopper and drive the adhesive pellets to the melter; a feed line configured to provide compressed gas to the venturi feed to operate the venturi feed
Implementation Method 2
a vibrator connected to the hopper, the vibrator configured to vibrate the hopper to agitate the adhesive pellets
Implementation Method 3
a melter configured to melt the adhesive pellets to form a liquid adhesive
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A hot melt system is configured to generate liquid adhesive from solid adhesive pellets. The liquid adhesive is applied to components, such as box tops, to fix components together. A melter is configured to melt the adhesive pellets into the liquid adhesive. Adhesive pellets are periodically fed from a hopper to the melter to maintain a constant supply of liquid adhesive. A adjustable flow restrictor is disposed upstream of venturi feed that displaces the adhesive pellets from the hopper to the melter. The adjustable flow restrictor is adjustable to change a flow of the compressed gas flow to the venturi feed. Adjusting the flow of the compressed gas flow adjusts the feed rate of the adhesive pellets from the hopper to the melter.