Porous Thermoplastic Core for Lightweight Rigid HPL Panels
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Solution Overview
Problem
Existing composite panels based on high-pressure laminate (HPL) panels are either too heavy due to thickness requirements for stability or lack sufficient rigidity, making them unsuitable for applications needing both lightness and structural integrity.
Innovation Solution
A composite panel design featuring two HPL outer layers connected by a core layer of fiber-reinforced thermoplastic with air voids, where the adhesive is mechanically anchored in the core's surface pores, allowing for adjustable density and enhanced mechanical anchoring using water-free or low-water adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the core layer is made solid dense to improve rigidity, then the panel becomes heavier
Solution Approach 1:
The core layer is designed with controlled porosity (air voids of 20-85% by volume) rather than being solid dense. This porous structure reduces weight while the fiber reinforcement (35-80% by weight) and adhesive mechanical anchoring in the pores provide the necessary rigidity and strength, resolving the contradiction between weight reduction and rigidity maintenance
Solution Approach 2:
The invention uses a composite core layer combining fiber-reinforced thermoplastic resin with air voids. The fibers provide structural strength and rigidity, the thermoplastic matrix binds the fibers together, and the air voids reduce density and weight. This composite approach allows achieving rigidity without solid density, thus reducing panel weight
2Stability of the object's composition
If the core layer thickness is increased to improve stability, then the panel becomes heavier
Solution Approach 1:
The porous core layer structure provides stability through the distributed fiber network and controlled air voids rather than relying on increased thickness. The fibers create a skeletal structure that maintains panel stability while the porosity keeps the material lightweight, avoiding the need to increase thickness for stability
Solution Approach 2:
The invention changes the density parameter of the core layer by introducing air voids (20-85% by volume), transforming it from a solid dense structure to a lightweight porous structure. This parameter change allows achieving stability with reduced thickness and weight, as the porous structure provides sufficient structural support through its fiber reinforcement
3Strength
If traditional adhesives are used without mechanical anchoring, then the bonding strength is insufficient
Solution Approach 1:
The porous surface structure of the core layer is utilized to provide mechanical anchoring for the adhesive. The adhesive penetrates into the pores and forms mechanical interlocking, significantly enhancing bonding strength. This approach improves bonding without requiring complex adhesive application systems or additional anchoring mechanisms
Solution Approach 2:
The porous core layer structure itself serves as the anchoring mechanism for the adhesive. The natural porosity of the core layer provides the mechanical interlocking feature, eliminating the need for separate anchoring elements or complex adhesive formulations. The core layer's own structure enables the enhanced bonding
4Strength
If the core layer is made with high fiber content to improve rigidity, then the adhesive penetration into pores becomes difficult
Solution Approach 1:
The invention optimizes the porosity parameter (20-85% by volume) and fiber content (35-80% by weight) to achieve a balance where sufficient rigidity is maintained while adequate pore space remains for adhesive penetration. The controlled porosity ensures that even with high fiber content, there is enough void space for the adhesive to penetrate and mechanically anchor
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 design results in lighter, more rigid composite panels with improved moisture resistance and dimensional stability, enabling applications like laminate floors without swelling issues and offering weight savings for transport and handling.
Implementation Method 1
The core layer B and the cover layers A are connected to one another by means of an adhesive, which is in the pores located on the surface of the core layer mechanically anchored
Implementation Method 2
The core layer B is formed of a fiber-reinforced thermoplastic resin having a reinforcing fiber content of 35 to 80% by weight
Implementation Method 3
The core layer B and the cover layers A are connected to one another by means of an adhesive, which is in the pores located on the surface of the core layer mechanically anchored
Data Source
AI summary
The invention relates to a composite sheet comprising top layers of high pressure laminate sheets A and a core layer B arranged therebetween. The core layer is formed from an air-pore-containing, fibre-reinforced thermoplastic and is adhesively bonded to the top layers.