Embossed Cellulose Laminated Board for Rigid Display Panels
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Solution Overview
Problem
Current foam boards used for large displays and graphic panels are environmentally detrimental due to their non-recyclable composition and high petrochemical content, while alternatives like corrugated boards lack rigidity and suffer from moisture-related bowing and flute shadow issues, making them unsuitable for high-quality printing.
Innovation Solution
A method and apparatus for producing a laminated board using embossed cellulose-based plies with aligned and offset embossed projections, steam conditioning, and symmetrical adhesive and pressure application to create a strong, rigid, and lightweight board with controlled mechanical properties, eliminating the need for plastic foams and addressing the limitations of corrugated boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If foam board is used for large displays and graphic panels, then high rigidity, thickness and low weight are achieved, but environmental friendliness deteriorates due to non-recyclability and petrochemical content
Solution Approach 1:
The invention changes the material composition parameter from petrochemical foam to 100% cellulose fibre, and alters the structural parameter by creating embossed plies with projections and voids. This transforms the board into a recyclable material while maintaining rigidity through the embossed cellular structure that provides mechanical strength without requiring dense material composition.
Solution Approach 2:
The invention creates a composite structure combining cellulose fibre plies with an embossed cellular pattern, forming a new material system that integrates the benefits of natural fibre recyclability with the structural rigidity previously achieved only through synthetic foam cores. The composite nature allows optimization of both environmental properties and mechanical performance.
2Object-affected harmful factors
If corrugated board is used as an alternative to foam board, then environmental friendliness improves through recyclability, but rigidity and printing quality deteriorate due to flute shadow and bowing
Solution Approach 1:
The invention applies local quality by creating embossed plies with specific projection patterns in certain regions while maintaining smooth facings in other areas. The embossed cellular structure is positioned internally to provide rigidity, while the outer facings remain smooth and free of flute patterns, eliminating shadow issues for high-quality printing.
Solution Approach 2:
The invention transitions from the traditional flat or simple corrugated structure to a three-dimensional embossed cellular structure with projections and voids. This dimensional change creates internal rigidity through the cellular geometry while allowing smooth external surfaces, effectively decoupling the structural function from the surface appearance.
3Manufacturing precision
If corrugated board with finer flute profile is used to reduce flute shadow, then printing quality improves, but structural balance deteriorates causing increased bowing
Solution Approach 1:
The invention applies local quality by differentiating between internal and external surface requirements. The internal embossed structure provides structural stability, while the external facings are kept smooth for printing. This localized differentiation allows optimization of both printing quality and structural balance without compromise.
Solution Approach 2:
The invention moves the structural complexity from the surface dimension to the internal dimension through embossed plies with projections and voids. This allows the external surface to remain flat and smooth for high-quality printing while the internal three-dimensional cellular structure provides the necessary structural balance and rigidity.
4Ease of manufacture
If conventional lamination methods are used for corrugated board, then production simplicity is maintained, but moisture imbalance occurs causing bowing
Solution Approach 1:
The invention applies preliminary action by pre-treating the cellulose fibre plies with moisture conditioning before lamination. This preliminary moisture adjustment ensures that all plies are at equilibrium moisture content before being bonded together, preventing subsequent moisture imbalance and bowing while maintaining a straightforward production process.
Solution Approach 2:
The invention replaces the traditional mechanical lamination process with a combination of moisture conditioning and adhesive bonding. By controlling moisture content before lamination and using adhesives to bond the embossed plies, the process achieves better moisture balance and structural stability without significantly increasing production complexity.
5Strength
If embossed plies are laminated with adhesive and pressure application, then rigidity and strength are improved, but process complexity increases
Solution Approach 1:
The invention merges the lamination and embossing operations into a single integrated process. The embossed plies are directly laminated together using adhesive and pressure without requiring separate embossing and lamination stages. This consolidation strengthens the board through direct bonding of the embossed surfaces while simplifying the overall manufacturing process by eliminating intermediate steps.
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 resulting board offers improved rigidity, reduced moisture content, and balanced mechanical properties, providing a recyclable and environmentally friendly alternative with high-quality printable facings, comparable to foam boards in thickness and weight, while avoiding the drawbacks of corrugated boards.
Implementation Method 1
steam conditioning
Implementation Method 2
symmetrical adhesive and pressure application
Data Source
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AI summary
A high bulk laminated board is produced using one or more embossed plies (21, 22). A method of producing the laminated board comprises: embossing first and second plies to produce first embossed projections extending from first sides of the first and second plies; placing adhesive (8, 9) on the first embossed projections on the first side of each of the first and second embossed plies; bringing the first and second plies together such that the first embossed projections on the first and second embossed plies are aligned; applying pressure to the first side of each of the first and second embossed plies to cause the first and second embossed plies to adhere together to form a composite ply; and adhering first and second flat outer plies (15, 16) onto first and second sides of the composite ply. Corresponding apparatus is provided.