Insulated Melt Processor Heater Reduces Thermal Loss
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Solution Overview
Problem
Extrusion of polymer materials under heat requires significant power due to inefficient thermal transfer into the extruder, resulting in thermal losses and potential thermal damage, as well as inhomogeneous heating leading to unwanted chemical or physical property variations in the polymer product.
Innovation Solution
A thermally insulated melt processor with a heater in direct contact with the barrel, featuring an insulating material and a wire heating element shaped into a sinusoidal coil, which provides efficient heat conduction and reduces thermal losses by minimizing gaps between the heater and the barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If external metallic heaters are used to heat the extruder, then the extruder can be heated, but thermal transfer efficiency is low and significant power is consumed
Solution Approach 1:
A ceramic insulated band is introduced as an intermediary between the heater and the extruder barrel. This band provides both thermal insulation to reduce heat loss to the surroundings and maintains thermal contact to transfer heat efficiently to the barrel, thereby reducing power consumption while minimizing thermal loss.
Solution Approach 2:
The heating system uses a composite structure combining ceramic insulation material with heating elements. The ceramic material provides thermal insulation properties while the heating elements provide heat generation, creating a composite system that improves overall thermal efficiency by directing heat to the extruder while minimizing environmental heat loss.
2Temperature
If heaters operate at high temperature to drive the thermal load, then heating effectiveness is improved, but skin tissue damage risk increases and metallic covers are required
Solution Approach 1:
The ceramic insulated band serves as a thermal mediator that allows the heater to operate at high temperatures for effective heating while preventing excessive heat from reaching the external metallic cover and surrounding area. This reduces the thermal risk to skin tissue while maintaining heating effectiveness.
Solution Approach 2:
The ceramic insulated band acts as a thin film or shell that provides thermal barrier protection. It allows high-temperature operation of the heating elements while protecting external surfaces and surrounding areas from excessive heat, thereby reducing skin tissue damage risk without requiring additional metallic covers.
3Loss of energy
If heaters are placed in direct contact with the extruder, then thermal transfer efficiency is improved, but thermal hot spots occur and thermal damage risks increase
Solution Approach 1:
The ceramic insulated band is applied asymmetrically or with varying thickness in different regions of the extruder barrel. This asymmetric distribution allows for uniform heat distribution across the barrel surface, preventing thermal hot spots while maintaining efficient thermal transfer from the heater to the extruder material.
Solution Approach 2:
The heating system uses local quality variation by adjusting the ceramic insulation properties or heater intensity in different zones of the extruder. This ensures that each region receives appropriate heat without creating hot spots, while maintaining overall thermal transfer efficiency.
4Object-affected harmful factors
If metallic covers are placed over the extruder and heater, then skin contact safety is improved, but the covers are heated by infrared radiation and also attain high temperature
Solution Approach 1:
The ceramic insulated band serves as a thermal mediator between the heater and the external environment, including any metallic covers. It blocks infrared radiation from heating the covers to dangerous temperatures, thereby maintaining skin contact safety while keeping cover temperatures low.
Solution Approach 2:
The ceramic insulation material converts the potentially harmful infrared radiation from the heater into beneficial localized heat transfer to the extruder barrel, while preventing the radiation from heating external covers. This transforms the thermal energy that would otherwise be wasted on heating covers into useful heating of the extruder material.
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 achieves reduced power consumption, eliminates hot spots, and ensures uniform temperature distribution along the barrel, enhancing the quality of the polymer product while minimizing energy expenditure.
Implementation Method 1
a heat member is disposed in the insulating material and configured to provide heat in response conduction of electric current through the heat member
Implementation Method 2
an insulating material in contact with a surface of the barrel
Implementation Method 3
a heater in direct contact with disposed on the barrel such that a gap is absent between the heater and the barrel
Data Source
Figure 1
Figure 3~4
Figure 5~6
AI summary
A thermally insulated melt processor comprises a barrel (10) and a heater (40) disposed on the barrel. The heater comprises an insulating material (42) in contact with a surface of the barrel and a heat member (44) disposed in the insulating material and configured to provide heat in response conduction of electric current through the heat member.