Cellulose Dry Dissolution High-Shear Kneader System
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Solution Overview
Problem
Existing dry dissolution methods for producing moulding solutions, particularly using extruders, face limitations in capacity, product quality, and safety due to high shear rates, limited dwell times, and the risk of overheating and explosion.
Innovation Solution
A system and method that incorporate a high-shear unit followed by a kneader-mixer to process a starting material into a moulding solution, allowing for longer dwell times and reduced shear action in the kneader-mixer, thereby enhancing product quality and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If extruders are used for dissolution of cellulose in dry dissolution method, then mixing efficiency is improved, but dwell time is reduced
Solution Approach 1:
The system divides the dissolution process into two distinct stages: first, a high-shear mixing stage in an extruder to achieve rapid initial mixing and swelling of cellulose; second, a gentle kneading stage in a kneader to complete dissolution without excessive mechanical stress. This segmentation allows each device to perform its optimal function - the extruder provides intense mixing efficiency while the kneader provides extended dwell time for complete dissolution.
2Power
If shaft speed is increased to achieve necessary mechanical action, then mixing intensity is improved, but risk of overheating increases
Solution Approach 1:
The mixing process is segmented into two stages with different intensity levels. The first stage uses high shaft speed in the extruder to provide intense mechanical action for rapid swelling and initial mixing. The second stage uses low shaft speed in the kneader to gently complete dissolution. This segmentation concentrates the high-intensity mechanical action in a controlled environment with efficient cooling, while the second stage operates at low intensity to avoid overheating.
Solution Approach 2:
The system maintains continuous processing through the two-stage configuration, where the extruder operates continuously to provide intense mixing, and the kneader continuously follows to complete dissolution. This continuous action allows heat generated during high-intensity mixing to be immediately carried forward to the second stage, preventing heat accumulation and overheating while maintaining productive throughput.
3Productivity
If extruder diameter is increased to increase capacity, then production capacity is improved, but cooling efficiency is reduced
Solution Approach 1:
The system segments the dissolution function between two devices: the extruder handles the intensive mixing and swelling phase where cooling is most critical, operating at a manageable diameter to maintain efficient heat dissipation; the kneader handles the gentle completion phase with minimal heat generation. This segmentation allows the extruder to be sized for optimal cooling efficiency while the overall system capacity is increased through the combined throughput of both devices.
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 proposed solution increases product quality and processing capacity while reducing the risk of overheating and explosion, enabling more efficient and safe production of moulding solutions on an industrial scale.
Implementation Method 1
The reason is the high shearing intensity of extruders
Implementation Method 2
the mechanical energy input, and thus the risk of substantial overheating of the product or the product components increases
Implementation Method 3
in the discharge-side region of the extruder, dissipation of heat from the product, by means of cooling, may be necessary, in order to prevent overheating or substantial overheating
Data Source
AI summary
The invention relates to a method for processing a shapeable solution from a starting material that consists of cellulose, water and a functional medium, according to the dry dissolution method, wherein the starting material is first supplied to a high-shear unit, wherein a transfer mixture is obtained from the starting material in the high-shear unit, and the transfer mixture is then supplied to a kneader-mixer for dissolution.