Particulate Drum Drying for Low-Temperature Textile Moisture Removal
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Solution Overview
Problem
Conventional tumble drying processes are energy-inefficient, requiring high temperatures and long durations, which leads to increased energy consumption and fabric damage due to creasing, while also being less efficient than washing in terms of energy use.
Innovation Solution
An apparatus using a rotatably mounted cylindrical drum with solid or perforated side walls, equipped with capturing and transferring means to facilitate the use and collection of solid particulate material, such as polymeric or non-polymeric particles, that promotes mechanical interaction with substrates for efficient drying at lower temperatures, reducing fabric creasing and allowing for the reuse of the particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tumble drying processes use high temperatures and prolonged treatment, then drying effectiveness is improved, but energy consumption increases
Solution Approach 1:
The patent replaces the conventional thermal drying system with a mechanical drying system. A drum rotates to tumble substrates with solid particulate material, using mechanical action rather than heated air to achieve drying. This substitution fundamentally changes the energy pathway from thermal to mechanical, resolving the contradiction between drying effectiveness and energy consumption.
Solution Approach 2:
The patent changes the operating parameters from high temperature and prolonged time to ambient or elevated temperatures with optimized mechanical action. By modifying the drying mechanism from thermal to mechanical and adjusting rotation speeds and particle characteristics, effective drying is achieved with significantly reduced energy input.
2Productivity
If conventional tumble drying processes use high temperatures, then drying speed is improved, but fabric damage due to creasing increases
Solution Approach 1:
The patent replaces the thermal field with a mechanical field for drying. Instead of using high-temperature air that causes fabric damage, the system uses controlled mechanical tumbling with solid particles to remove moisture, achieving fast drying without the harmful thermal effects that cause creasing and fabric degradation.
Solution Approach 2:
The patent introduces solid particulate material as an intermediary between the drum and the substrate. These particles facilitate moisture removal through mechanical interaction while being gentler than direct fabric-on-fabric contact in conventional dryers, thereby preventing creasing and fabric damage while maintaining high drying speed.
3Use of energy by moving object
If solid particulate material is used for drying, then energy consumption is reduced, but particle removal from substrates becomes difficult
Solution Approach 1:
The patent employs periodic reversal of drum rotation direction. During the forward rotation, particles are tumbled with substrates for drying; during reverse rotation, particles are separated and returned to the drum. This periodic action automatically manages particle-substrate interaction and separation, making particle removal easy without additional energy input.
Solution Approach 2:
The system uses the drum's own rotation to accomplish both drying and particle separation functions. The same mechanical action that achieves drying also facilitates particle removal through direction reversal, eliminating the need for separate particle removal mechanisms and maintaining low energy consumption.
4Productivity
If mechanical action is increased to promote water release, then drying efficiency is improved, but fabric creasing increases
Solution Approach 1:
The patent uses solid particulate material as an intermediary that distributes mechanical action more evenly. Instead of direct fabric-on-fabric contact that causes concentrated stress and creasing, the particles mediate the mechanical interaction, facilitating water release through gentler, more distributed forces that maintain drying efficiency while reducing fabric damage.
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 enables efficient drying at reduced temperatures, lowering energy consumption, minimizing fabric damage, and allowing for the reuse of solid particulate material, thereby achieving economic and environmental benefits.
Implementation Method 1
Mechanical action in a conventional, horizontal axis tumble dryer is generated by the forces acting on the fabric through falling and hitting either other fabric or the dryer inner drum surface, whilst the fabric is interacting with the forced hot air flow. This results in release and evaporation of water from within the fabric
Implementation Method 2
Tumble drying processes... involve placing the textiles in a container such as a cylindrical drum which is rotated in alternating clockwise and anti-clockwise cycles
Data Source
AI summary
The invention provides an apparatus and method for use in the drying of substrates using a solid particulate material, the apparatus comprising: (a) housing means (1) having mounted therein a rotatably mounted cylindrical drum (2); (b) access means (15); and (c) at least one collection means (10), wherein said rotatably mounted cylindrical drum (2) additionally comprises capturing and transferring means, adapted to facilitate collection of said solid particulate material and transfer of said material to said at least one collection means (10). The invention also provides a method comprising treating the substrate with a solid particulate material at ambient or elevated temperature, said treatment being carried out using the apparatus of the invention. The apparatus and method find particular application in the drying of wet textile fabrics.