Multilayer Polyethylene Foam Material with Rigid HDPE Surfaces
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Solution Overview
Problem
Existing multilayer materials for construction, such as prefabricated sheets, lack a combination of lightweight, compressibility, and high resistance to damage while maintaining rigid exterior surfaces, which are difficult to achieve simultaneously.
Innovation Solution
A multilayer material composed of oppositely disposed high density polyethylene (HDPE) outer layers, low density polyethylene (LDPE) intermediate layers for thermal bonding, and polyethylene foam inner layers, where the inner layers provide compressibility and the intermediate layers facilitate bonding between the outer and inner layers, manufactured through a process involving pre-formed rolls, thermal bonding, and orientation reversal to ensure parallel exterior surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a multilayer material is designed to be lightweight and compressible, then the material can be easily manipulated and absorbed impacts, but the exterior surfaces may become soft and vulnerable to damage
Solution Approach 1:
The patent applies different material properties to different layers: the inner layers use low-density foam for lightweight and compressible properties, while the outer layers use high-density rigid material for damage resistance. This local differentiation of material quality resolves the contradiction between being lightweight and being resistant to damage.
Solution Approach 2:
The patent creates a composite multilayer structure combining materials with different densities and properties. The composite structure integrates the benefits of low-density foam (lightweight, compressible) with high-density material (rigid, damage-resistant), resolving the contradiction through material composition.
2Adaptability or versatility
If multiple layers are combined to achieve different properties, then the material can provide both compressibility and rigid surfaces, but the manufacturing process becomes complex
Solution Approach 1:
The manufacturing process is segmented into distinct stages: forming individual layers with specific properties, bonding them together, and then cutting to final dimensions. This segmentation of the manufacturing process makes the complex multilayer construction manageable and systematic.
Solution Approach 2:
The patent performs preliminary actions by pre-forming individual layers with their desired properties before assembly. The outer layers are prepared with rigid surfaces and the inner layers are prepared as compressible cores, so that when assembled, the final product achieves the desired combination of properties without complex in-process adjustments.
3Reliability
If the material is made compressible for impact absorption, then it can protect against damage, but the exterior surfaces may lose rigidity and parallelism
Solution Approach 1:
The compressibility is localized to the inner layers while the outer layers maintain rigid parallel surfaces. This local differentiation allows the material to absorb impacts through inner layer compression while preserving the parallelism and rigidity of the exterior surfaces for structural integrity and aesthetics.
Solution Approach 2:
The patent separates the functions of impact absorption and surface maintenance into different dimensions of the structure. The inner layers handle compression in the thickness direction, while the outer layers maintain surface parallelism and rigidity, effectively solving the contradiction through dimensional separation of functions.
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 material is lightweight, compressible, and highly resistant to damage with rigid, parallel exterior surfaces, offering improved thermal bonding and mechanical properties compared to traditional materials.
Implementation Method 1
the intermediate layers facilitate thermal bonding between the outer layers and the inner layers
Data Source
AI summary
A multilayer material is disclosed which consists of polyethylene foam sandwiched between two external layers of high-density polyethylene. A two-step manufacturing process for forming such a multilayer material is disclosed, which consists of (1) thermal bonding of a roll stock of PE foam with a roll stock of HDPE/LDPE laminate, followed by cutting into composites, and (2) thermal bonding of two composites to form a multilayer material.