Thin Slit Heat Exchanger for Uniform Hot Melt Adhesive Heating
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Solution Overview
Problem
Hot melt adhesive materials exhibit thermal insulative properties, leading to uneven heat distribution, with regions near the heater being hotter than those farther away, and the materials do not flow in a manner that encourages heat distribution, resulting in inefficient heating and potential degradation at elevated temperatures.
Innovation Solution
The use of heat exchange devices with fluid passageways featuring thin slit sections that direct and heat the liquid adhesive material, maintaining it at lower temperatures before heating, thereby reducing energy consumption and preventing degradation, while ensuring even and thorough heating through the design of concentric body segments and strategically placed heating elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating methods are used to heat liquid adhesive material, then the adhesive material can reach application temperature, but the heating is uneven and energy consumption increases due to thermal insulative properties
Solution Approach 1:
The patent applies local quality by creating a temperature gradient within the adhesive material through controlled heating zones. The heating element heats the adhesive locally, and the viscosity changes create natural convection patterns that distribute heat throughout the material, achieving uniform temperature without excessive energy input.
Solution Approach 2:
The patent utilizes parameter changes by exploiting the temperature-dependent viscosity characteristics of the adhesive material. As the adhesive is heated, its viscosity decreases, which enhances flow and heat distribution. This natural parameter change enables efficient heat transfer without requiring additional energy input.
2Productivity
If elevated temperatures are applied to liquid adhesive material, then heating efficiency improves, but material degradation occurs
Solution Approach 1:
The patent employs periodic action through natural convection cycles driven by temperature-induced viscosity changes. The adhesive material undergoes continuous cyclic motion as warmer, less viscous regions rise and cooler, more viscous regions sink, creating an efficient periodic heat distribution mechanism that avoids sustained high-temperature exposure and prevents degradation.
Solution Approach 2:
The patent replaces mechanical stirring or pumping systems with a passive thermal convection mechanism. By utilizing the inherent temperature-viscosity relationship of the adhesive, the system achieves efficient heat distribution through natural fluid motion, eliminating the need for additional mechanical energy input that could cause overheating and degradation.
3Manufacturing precision
If liquid adhesive material is heated uniformly, then application quality improves, but the thermally insulative nature of the material resists heat transfer
Solution Approach 1:
The patent exploits parameter changes in the adhesive material's viscosity as a function of temperature. By heating the material to specific temperature thresholds, the viscosity decreases naturally, which enhances heat transfer efficiency. This parameter-driven approach ensures uniform heating while overcoming the material's insulative properties through controlled physical changes.
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 approach allows for efficient and uniform heating of liquid adhesive materials, reducing energy consumption and minimizing degradation, ensuring the material is at the correct temperature for bonding applications without overheating, and promoting even heat distribution across the adhesive.
Implementation Method 1
a heating element for heating the liquid adhesive material flowing through the thin slit section to the application temperature
Implementation Method 2
the thin slit section further having a first dimension and a second dimension transverse to the fluid flow direction. The first dimension and the length are substantially greater than the second dimension
Data Source
Figure 1~3
Figure 2
Figure 4
AI summary
A heat exchange device (10, 110) for heating liquid adhesive material to an application temperature suitable for an adhesive bonding application includes a body (12, 112) having an inlet (14, 140) configured to receive a flow of liquid adhesive material and an outlet (16, 134) configured to provide the liquid adhesive material to a dispensing device (20, 114) for the adhesive bonding application. A fluid passageway (22, 140) in the body (12, 112) connects the inlet (14, 140) and the outlet (16, 134). The fluid passageway (22, 140) includes a thin slit section (28, 146) having a length along a fluid flow direction between the inlet (14, 140) and the outlet (16, 134), the thin slit section (28, 146) further having a first dimension and a second dimension transverse to the fluid flow direction. The first dimension and the length are substantially greater than the second dimension. The heat exchange (10, 110) further includes a heating element (56, 170) for heating the liquid adhesive material flowing through the thin slit section (28, 146) to the application temperature.