Thermoplastic Underlay with Closed-Cell Microstructure for Load and Barrier Control
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Solution Overview
Problem
Current underlayment layers compromise the subfloor's support of floor coverings under excessive loads while being insufficient as barriers to noise, moisture, and liquid.
Innovation Solution
A thermoplastic polymer underlayment with a microstructure of closed cells, each less than 200 micrometers long and a density of at least 0.18 grams per cubic centimeter, which provides compressive strength that supports the subfloor and acts as an effective barrier against noise, moisture, and liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a thick underlayment layer is used to provide cushioning and resiliency, then noise and moisture barrier performance is improved, but the subfloor's support of the floor covering is compromised under excessive loads
Solution Approach 1:
The patent changes the density parameter of the underlayment material to a specific range (0.18-0.30 g/cm³) and controls cell size (≤200 micrometers) to achieve optimal balance between cushioning and support. This parameter optimization allows the material to provide noise and moisture barrier performance while maintaining subfloor support capability.
Solution Approach 2:
The patent uses a composite thermoplastic polymer material with a specific microstructure consisting of closed cells. This composite structure combines the benefits of cushioning from the cellular architecture with the strength and dimensional stability of thermoplastic polymers, resolving the contradiction between softness for noise reduction and hardness for structural support.
2Strength
If a thick underlayment layer is used to provide cushioning, then resiliency is improved, but uneven stress across floor tiles increases making joints more susceptible to bending and breaking
Solution Approach 1:
The patent optimizes the density parameter (0.18-0.30 g/cm³) and cell size (≤200 micrometers) to control the degree of resiliency. This precise parameter control ensures adequate cushioning while limiting excessive deformation that would cause uneven stress concentration at tile joints, thereby maintaining floor tile joint integrity.
Solution Approach 2:
The patent creates a uniform microstructure with consistently small closed cells throughout the underlayment. This local quality control ensures even stress distribution across the entire floor surface, preventing stress concentration at specific locations like tile joints while maintaining overall cushioning performance.
3Reliability
If a thin underlayment layer is used to support floor tiles against uneven stress, then floor tile joint reliability is improved, but noise and moisture barrier performance deteriorates
Solution Approach 1:
The patent changes the density parameter to a higher range (0.18-0.30 g/cm³) and controls cell size (≤200 micrometers) to achieve adequate support for floor tiles. Simultaneously, the closed-cell structure provides effective noise and moisture barrier performance, resolving the contradiction between thin-layer support and barrier functionality.
Solution Approach 2:
The patent uses a closed-cell porous structure where the cells are small (≤200 micrometers) and densely packed. This porous architecture provides both mechanical support for floor tiles and effective barrier properties against noise, moisture, and liquid transmission, eliminating the need for thicker materials.
4Object-affected harmful factors
If an underlayment with high pliability is used to reduce noise transmission, then noise barrier performance is improved, but compressive strength decreases interfering with subfloor support
Solution Approach 1:
The patent employs a composite thermoplastic polymer with a controlled closed-cell microstructure. This composite material combines the noise-reducing properties of pliable cellular structures with the compressive strength of thermoplastic polymers, achieving both noise barrier performance and adequate subfloor support.
Solution Approach 2:
The patent optimizes density (0.18-0.30 g/cm³) and cell size (≤200 micrometers) parameters to balance pliability and compressive strength. The higher density and smaller cell size provide adequate compressive strength for subfloor support while the cellular structure maintains noise reduction capabilities.
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 solution ensures even load transfer to the subfloor, reduces noise transmission, and mitigates damage from moisture and liquid, maintaining the subfloor's support without compromising it.
Implementation Method 1
a compressive strength of the thermoplastic material may be generated that does not interfere with the sub-floor's support of the floor covering, i.e., that effectively or more evenly transfers the loading experienced by the floor covering to the sub-floor
Implementation Method 2
the closed cells, or bubbles, of the microstructure provide an effective barrier against noise, moisture, and liquid travelling through the floor
Data Source
AI summary
A material for making an underlayment of a floor includes a thermoplastic polymer that has a thickness and a microstructure. The microstructure includes a plurality of closed cells, each cell containing a void and each cell having a maximum dimension extending across the void within the cell that is less than or equal to 200 micrometers long. The microstructure also includes a density that is greater than or equal to 0.18 grams per cubic centimeter.