Papermaking Felt Batt Layer Using Water-Absorbing Resin
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Solution Overview
Problem
Conventional papermaking felts face challenges in maintaining water squeezing capability and compressibility due to premature compaction, leading to a short initial warming-up period and operational limitations, as they become crushed under repeated pressure and lose water permeability.
Innovation Solution
Incorporating a water-absorbing resin with a coefficient of water absorption between 1.05 and 10 into the batt layer of the papermaking felt, which maintains free space volume and compressibility, ensuring effective water squeezing and hydraulic pressure transmission to the wet paper web.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional papermaking felt is used, then water squeezing capability is initially good, but compressibility is lost due to premature compaction under repeated press pressure
Solution Approach 1:
The patent applies parameter changes by incorporating a water-absorbing resin with specific water absorption coefficient (1.05-10) into the felt structure. This resin absorbs water during the initial warming-up period, causing swelling that maintains free space volume and prevents premature compaction. The chemical composition parameter of the felt is fundamentally changed to resolve the contradiction between initial compressibility and long-term operational durability.
Solution Approach 2:
The patent uses composite materials by combining conventional felt fibers with a water-absorbing resin component. This creates a multi-component structure where the resin acts as a spacer that maintains the three-dimensional structure and free space volume of the felt during operation, preventing the compaction that would otherwise occur under repeated press pressure.
2Productivity
If felt is compressed to increase density, then water permeability improves, but free space volume is reduced leading to shorter initial warming-up period
Solution Approach 1:
The water-absorbing resin performs preliminary action by absorbing water during the initial warming-up period before the felt enters normal operation. This pre-swelling maintains the free space volume structure in advance, allowing the felt to achieve optimal performance quickly without requiring prolonged compression and warming-up time.
Solution Approach 2:
The patent changes the physical-chemical parameters of the felt by introducing a water-absorbing resin with controlled absorption coefficient. This parameter change enables the felt to maintain free space volume while still achieving rapid warming-up, as the resin-controlled swelling prevents excessive compaction during the initial operation phase.
3Productivity
If felt operates at high speed, then productivity increases, but compressibility deteriorates due to accumulated press pressure
Solution Approach 1:
The water-absorbing resin provides self-service functionality by continuously absorbing water that migrates into the felt during high-speed operation. This automatic water absorption maintains the free space volume and compressibility without requiring external intervention, allowing the felt to sustain high-speed operation while preserving its mechanical properties.
Solution Approach 2:
The patent applies parameter changes by using a water-absorbing resin that dynamically responds to operating conditions. During high-speed operation, the resin continues to absorb water and maintain swelling, adapting the felt's physical parameters to sustain compressibility even under accumulated press pressure and high-speed conditions.
4Strength
If water-absorbing resin is added to maintain free space volume, then compressibility is maintained, but water absorption capacity increases leading to longer warming-up period
Solution Approach 1:
The patent precisely controls the water absorption parameter by selecting a resin with a specific absorption coefficient range (1.05-10). This parameter optimization ensures the resin absorbs enough water to maintain free space volume and compressibility, but not so much that it excessively extends the warming-up period. The coefficient range is carefully chosen to balance these competing requirements.
Solution Approach 2:
The water-absorbing resin is distributed locally within the felt structure at controlled amounts. This local quality approach ensures that water absorption occurs at specific locations where it is needed to maintain free space volume, rather than uniformly throughout the entire felt, thereby minimizing the overall warming-up time while still achieving the compressibility maintenance goal.
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 water-absorbing resin maintains water draining capability and elasticity, improving the initial warming-up period and extending the operational period by reducing the impact of press pressure and preventing dirt accumulation, while maintaining suitable water permeability.
Implementation Method 1
a water-absorbing resin with a coefficient of water absorption between 1.05 and 10 is included in the batt layer
Implementation Method 2
ensuring effective water squeezing and hydraulic pressure transmission to the wet paper web
Implementation Method 3
The water-absorbing resin maintains water draining capability and elasticity, improving the initial warming-up period while extending the operational period by reducing the impact of press pressure
Data Source
AI summary
Papermaking felts include a base material and a batt layer provided on one or both sides of the base material. The batt layer includes a water-absorbing resin, and the water-absorbing resin has a coefficient of water absorption of from 1.05 and 10.