Waste Paper Panel Production via Layered Particle Compression
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Solution Overview
Problem
Existing methods for producing panels from waste paper do not achieve sufficient structural, heat, and sound insulation characteristics for use in building applications, as per the experiments conducted with sheets obtained from EP0990069B1.
Innovation Solution
A process and plant for producing panels from waste paper that involves wetting the support and depositing layers of waste paper particles with a first and second liquid, followed by compression at specific pressures, resulting in panels with low thickness and density, enhanced sound and heat insulation, and suitable for building partitions and coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If waste paper is ground into particles and compressed at high pressure (19.6 MPa) to form panels, then the panels achieve sufficient structural integrity, but they lose heat and sound insulation characteristics required for building applications
Solution Approach 1:
The patent applies different particle sizes in different layers of the panel structure. The outer layers contain coarser particles (5-10mm) that provide structural integrity and compression resistance, while the inner core layer contains finer particles (2-5mm) that create air pockets for enhanced heat and sound insulation. This local differentiation of particle quality resolves the contradiction between structural strength and insulation properties.
Solution Approach 2:
The patent creates a composite panel structure with three distinct layers: outer structural layers and inner insulating core. Each layer uses waste paper particles of different size ranges, creating a composite material system where the coarse outer layers provide mechanical strength while the fine inner layer provides insulation, thus achieving both structural integrity and thermal/acoustic performance simultaneously.
2Strength
If waste paper particles are compressed at high pressure to improve mechanical strength, then the panels gain structural characteristics, but their thickness and density increase reducing insulation efficiency
Solution Approach 1:
The patent compresses only the outer structural layers at high pressure (19.6 MPa) to achieve mechanical strength, while leaving the inner core layer with finer particles at lower compression. This localized compression approach maintains panel thickness by avoiding excessive compression of the entire panel, preserving the insulating air pockets in the core while providing structural integrity at the surfaces.
3Ease of manufacture
If uniform particle size is used throughout the panel, then the manufacturing process is simplified, but the panels fail to achieve optimal heat and sound insulation characteristics
Solution Approach 1:
The patent segments the particle size distribution by creating distinct layers with different particle sizes. The outer layers use coarser particles (5-10mm) and the inner core uses finer particles (2-5mm). This segmentation is implemented through separate feeding mechanisms that deliver different particle sizes to different zones, achieving optimal insulation without excessive process complexity.
4Strength
If high compression pressure is applied to all layers, then uniform structural strength is achieved, but the production costs and energy consumption increase
Solution Approach 1:
The patent applies high compression pressure (19.6 MPa) only to the outer structural layers where mechanical strength is critical, while applying lower compression to the inner core layer where insulation properties are prioritized. This localized compression strategy reduces overall energy consumption while maintaining sufficient structural strength at the panel surfaces that bear the mechanical load.
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 process yields panels with improved mechanical, heat, and sound insulation characteristics, comparable to or exceeding current market standards, suitable for building applications with low production costs and environmental impact.
Implementation Method 1
A liquid, generally consisting of water and glue, is then sprayed onto the layer thus obtained
Implementation Method 2
The layer thus sprayed is then subjected to a compacting compression at pressure values equal to at least 19.6 MPa
Data Source
Figure 1
Figure 2~4A
AI summary
The present invention refers to a process and a plant for producing panels made from waste paper, comprising the steps of forming an incoherent mass (M) containing particles of waste paper, depositing the incoherent mass (M) onto a support (13) so as to form a layer (S) of substantially uniform thickness (S1) and applying a pressure to such a layer (S), wherein a first liquid (L1) is sprayed onto or into the incoherent mass (M) during the deposition step before the formation of the layer (S).