Rocking-Type Sieve Classification for Water Absorbent Resin
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Solution Overview
Problem
Existing methods for producing polyacrylic acid (salt)-based water absorbent resins face challenges in maintaining high liquid permeability and physical properties, especially at large scales, due to increased costs and decreased efficiency from the addition of surface crosslinking agents and additives, which can lead to sieve net breakage and decreased classification efficiency.
Innovation Solution
A method involving a rocking-type sieve classification apparatus with a predetermined trajectory and double screen configuration to improve classification efficiency and reduce fine powder, enhancing liquid permeability and producibility of the water absorbent resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface crosslinking agents and additives are added to improve liquid permeability, then liquid permeability is improved, but production costs increase and sieve net breakage occurs
Solution Approach 1:
The invention extracts and removes the harmful additives (surface crosslinking agents and additives) from the production process. By classifying and separating particles during the drying stage, the patent achieves the desired liquid permeability without requiring additional chemical agents, thus reducing production costs and eliminating sieve net breakage caused by these additives.
Solution Approach 2:
The patent performs particle classification during the drying stage, before the final product is completed. By pre-classifying particles at this intermediate stage, the invention achieves the desired particle size distribution and liquid permeability properties early in the process, eliminating the need for subsequent additive treatments and reducing overall production complexity.
2Reliability
If surface crosslinking agents and additives are added to improve liquid permeability, then liquid permeability is improved, but classification efficiency decreases
Solution Approach 1:
The invention removes the need for surface crosslinking agents and additives by implementing a classification system that operates during the drying stage. This extraction of harmful substances restores classification efficiency to high levels while maintaining improved liquid permeability properties.
Solution Approach 2:
By performing classification during the drying stage rather than after product completion, the patent achieves efficient particle separation before additives would interfere with the process. This preliminary classification action maintains high productivity while achieving the desired liquid permeability.
3Productivity
If production scale is increased to improve productivity, then productivity is improved, but liquid permeability and physical properties become unstable
Solution Approach 1:
The patent implements particle classification during the drying stage, which is an intermediate stage accessible at all production scales. By performing this classification action early in the process, the invention ensures consistent particle size distribution and physical properties regardless of production scale, maintaining reliability while enabling high productivity.
Solution Approach 2:
The classification system operates autonomously during the drying stage without requiring additional external agents or complex interventions. This self-service mechanism ensures consistent physical properties at any production scale, as the classification process inherently maintains product quality without being affected by production volume.
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 method stabilizes the physical properties, particularly liquid permeability, and improves producibility of polyacrylic acid (salt)-based water absorbent resins, even at large scales, by optimizing the classification process and reducing equipment costs.
Implementation Method 1
a rocking-type sieve classification apparatus with a predetermined trajectory
Implementation Method 2
a rocking-type sieve classification apparatus with a predetermined trajectory and double screen configuration to improve classification efficiency
Data Source
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AI summary
Provided is a method for producing a polyacrylic acid (salt)-based water absorbent resin in which the physical properties (especially liquid permeability) are improved and maintained even in large scale production. The method for producing a polyacrylic acid (salt)-based water absorbent resin, which sequentially includes a polymerization step, in which a monomer aqueous solution having acrylic acid (salt) as a main component is polymerized, a drying step, in which a water-containing gel-like crosslinked polymer obtained in the polymerization step is dried, and a classification step, in which a polymer obtained in the drying step is classified, wherein a rocking-type sieve classification apparatus is used in the classification step, and the rocking-type sieve classification apparatus has a sieve net having a trajectory and a rotation speed in the following ranges; radial gradient R: from 5 to 40 mm, tangential gradient T: from 0.1 to 25 mm, eccentric gradient E: from 40 to 80 mm, and rotation speed F: from 60 to 600 rpm.