Heated Feed Screw Shaft for Drying Low-Bulk-Density Material
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Solution Overview
Problem
Existing systems are inefficient for drying and feeding low bulk density materials like organic particles, which are prone to bridging and moisture retention, requiring separate and energy-inefficient drying processes before compounding.
Innovation Solution
A shaft-based arrangement with a feed screw and external heating means that heats the material during transport, using thermal conduction and dry air flow to evaporate moisture, ensuring efficient drying and preventing moisture pockets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a separate drying chamber system is used to dry low bulk density materials, then the material can be dried, but the system becomes space inefficient and energy inefficient
Solution Approach 1:
The patent combines the drying function and feeding/transport function into a single integrated arrangement. The feed screw that feeds material into the extruder also serves as the drying element through external heating, eliminating the need for a separate drying chamber and reducing both space requirements and energy consumption.
Solution Approach 2:
The feed screw is given multiple functions: it feeds material into the extruder and simultaneously dries the material through external heating. This multi-functional approach reduces the number of separate components needed in the system.
2Ease of operation
If low bulk density organic particles are fed into the compounding extruder without proper drying, then feeding is simplified, but moisture pockets form and drying becomes difficult
Solution Approach 1:
The material is dried before feeding into the extruder through the integrated heating system. By performing the drying action preliminarily in the feeding arrangement itself, the material enters the extruder in a dry state, preventing moisture pocket formation during subsequent processing.
3Quantity of substance
If organic particles are dried before feeding, then moisture content is reduced, but the process requires separate drying steps reducing overall efficiency
Solution Approach 1:
The drying process and feeding process are merged into a single simultaneous operation. The feed screw with external heating dries the material while feeding it, eliminating sequential steps and improving overall process efficiency while achieving the required moisture reduction.
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 solution allows for simultaneous drying and transport, reducing the need for separate drying steps and improving material quality by achieving moisture levels below 2% while enhancing safety and energy efficiency.
Implementation Method 1
heating the shaft and the feed screw by means of a heating means arranged outside the shaft
Implementation Method 2
the material is dried by being heated by the shaft and feed screw
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
An arrangement (100) for feeding and drying a material, the arrangement (100) comprising a shaft (110) for transport of the material, a feed screw (120) arranged in the shaft (110) for feeding the material through the shaft (110), a heating means (130) provided outside the shaft (110) and arranged to heat the arrangement (100) to dry the material in the shaft (110).