Primary carpet backing
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Solution Overview
Problem
Traditional carpet tile production methods require multiple layers of polymer coating to ensure adequate bonding between reinforcement layers and backing, which are costly and can lead to issues like latex bleeding and reduced flatness stability.
Innovation Solution
A primary carpet backing structure comprising three layers, where the first layer has low air permeability and the third layer has high air permeability, with a reinforcement layer between them, to enhance bonding and prevent latex bleeding while maintaining flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple layers of polymer coating are used to ensure adequate bonding between reinforcement layer and backing, then bonding strength is improved, but manufacturing cost and material mass increase
Solution Approach 1:
The invention extracts the bonding function from separate polymer coating layers and integrates it into the primary carpet backing itself through a precoat layer. This eliminates the need for additional polymer coating layers while maintaining adequate bonding between the reinforcement layer and backing, thereby reducing polymer mass while preserving bonding strength.
Solution Approach 2:
The invention merges the backing structure and bonding function into a single integrated primary carpet backing component. The precoat layer is incorporated as part of the primary backing structure rather than as a separate coating layer, combining the support function and bonding function into one unified element that reduces overall polymer requirements.
2Quantity of substance
If polymer coating layers are minimized to reduce cost and mass, then material usage is reduced, but bonding adequacy deteriorates
Solution Approach 1:
The invention applies local quality by creating a precoat layer with specific bonding properties positioned exactly where bonding is needed - at the interface between the primary backing and reinforcement layer. This localized bonding layer ensures adequate bonding strength only where required, rather than applying polymer coating uniformly throughout the entire structure, thus optimizing polymer usage while maintaining bonding adequacy.
3Quantity of substance
If reinforcement layer is moved onto secondary carpet backing to reduce polymer layers, then polymer mass is reduced, but additional adhesives are required and flatness stability deteriorates
Solution Approach 1:
Instead of moving the reinforcement layer to the secondary backing as suggested in prior art, the invention inverts the approach by keeping the reinforcement layer on the primary backing and providing the bonding capability through the precoat layer of the primary backing. This reversal eliminates the need for additional adhesives on the secondary backing while maintaining flatness stability.
4Strength
If polymer coating has high affinity to primary carpet backing to improve bonding, then bonding strength is improved, but latex bleeding occurs making coating visible on carpet face
Solution Approach 1:
The precoat layer is designed with specific local properties - it has bonding affinity for the reinforcement layer on one side while controlling its interaction with the carpet face on the other side. This localized functional differentiation allows strong bonding without latex bleeding to the visible surface.
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 reduces the need for multiple polymer layers, improves flatness stability, and prevents latex bleeding by using asymmetrical air permeability to control fluid penetration.
Implementation Method 1
the nonwoven layer of fibers of the first layer has an air permeability of at most 8000 l/m2
Implementation Method 2
the nonwoven layer of fibers of the third layer has an air permeability of at least 20000 l/m2
Data Source
AI summary
A primary carpet backing comprising a structure of at least three layers, wherein a first layer and a third layer comprise a nonwoven layer of fibers, and wherein a second layer comprises a reinforcement layer of fibers and is located between the first and the third layer, characterized in that the nonwoven layer of fibers of the first layer has an air permeability of at most 8000 L/m2 s and the nonwoven layer of fibers of the third layer has an air permeability of at least 1000 L/m2 s measured according to ISO 9237:1995, wherein the nonwoven layer of fibers of the first layer has a lower air permeability as the nonwoven layer of fibers of the third layer.