Fiberboard Warpage Suppression via Beaten Pulp Parameters
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Solution Overview
Problem
Conventional fiberboard manufacturing methods using wet-crushing or dry-crushing of pulp materials face challenges such as long processing times, poor drainage, excessive warpage, and low tensile strength, which hinder efficient production and handling of fiberboards.
Innovation Solution
A method involving beating pulp in a gap between opposed blades to produce a plant-based fiber material with specific particle size and freeness values, combined with an adhesive component, to enhance drainage and tensile strength, and subsequent hot-pressing to form a fiberboard with reduced warpage and improved handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wet-crushing is used to produce fiber material, then high strength is achieved, but processing time becomes excessively long (about a few hours)
Solution Approach 1:
The patent changes the processing parameters by controlling the particle size distribution (D50: 50-110 μm, D90: 300-700 μm) and freeness value (150-300 ml) of the fiber material, achieving high strength with reduced processing time through optimized beating conditions rather than prolonged wet-crushing
Solution Approach 2:
The patent applies partial action by using a refiner with specific blade gaps (0.05-2.0 mm) to achieve the necessary fibrillation and adhesive component exposure without the excessive processing time of complete wet-crushing, producing sufficient fiber separation and adhesive exposure in a shorter duration
2Strength
If wet-crushing is used to produce fiber material, then high strength is achieved, but drainage becomes poor (excessively small particle-size distribution)
Solution Approach 1:
The patent optimizes the particle size distribution parameters (D50: 50-110 μm, D90: 300-700 μm) and freeness value (150-300 ml) through controlled beating, achieving a balance between fiber strength and drainage performance by preventing excessive fineness while maintaining adequate fibrillation
Solution Approach 2:
The patent applies partial action by using a refiner with specific blade gaps (0.05-2.0 mm) to achieve the necessary fibrillation and adhesive component exposure without the excessive processing time of complete wet-crushing, producing sufficient fiber separation and adhesive exposure in a shorter duration
3Loss of time
If dry-crushing is used to produce fiber material, then processing time is short and warpage is small, but tensile strength of the mat becomes small
Solution Approach 1:
The patent changes the physical state of processing from dry-crushing to wet-beating, controlling the particle size distribution (D50: 50-110 μm) and freeness value (150-300 ml) to achieve both short processing time and high mat tensile strength through optimized fiber fibrillation in aqueous medium
Solution Approach 2:
The patent creates a composite structure by producing fiber material containing both cellulose fibers and exposed adhesive components (lignin, hemicellulose) through controlled beating, resulting in a composite material that combines the structural integrity of fibers with the binding properties of adhesive components for high mat strength
4Strength
If fiber material with small particle size is used, then high strength is achieved, but separation from water becomes difficult (low drainage)
Solution Approach 1:
The patent optimizes the particle size distribution parameters (D50: 50-110 μm, D90: 300-700 μm) and freeness value (150-300 ml) through controlled beating, achieving a balance between fiber strength and drainage performance by preventing excessive fineness while maintaining adequate fibrillation
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
This method significantly reduces processing time, minimizes warpage, and enhances the tensile strength of fiberboards, making the production process more efficient and environmentally friendly by using only natural materials.
Implementation Method 1
pulp dispersed in water is beaten in a gap between opposed blades to thereby produce a plant-based fiber material
Implementation Method 2
by hot-pressing the mat, a fiberboard is formed from the mat through a process of plasticizing the adhesive component in the mat
Data Source
AI summary
[Object] To provide a fiberboard manufacturing method that is suitable for efficiently manufacturing a fiberboard in which warpage is suppressed, and to provide a fiberboard that is obtained by such a fiberboard manufacturing method.[Solution] The fiberboard manufacturing method of the present invention includes the following pulp crushing step S1, mat forming step S2, and hot-pressing step S3. In the pulp crushing step S1, pulp dispersed in water is beaten in a gap between opposed blades to thereby produce a plant-based fiber material that has a particle size D50 of 50 to 110 μm and a freeness value of 150 to 300 ml and that contains an adhesive component. In the mat forming step S2, a mat is formed from the plant-based fiber material. In the hot-pressing step S3, by hot-pressing the mat, a fiberboard is formed from the mat through a process of plasticizing the adhesive component in the mat.