Primary Carpet Backing Composition for Latex-Free Tuft Bind
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Solution Overview
Problem
Existing primary carpet backings for latex-free tufted carpets often have insufficient tuft bind, especially under severe conditions, making them prone to tuft failures and complicating recycling due to the presence of pre-coats.
Innovation Solution
A primary carpet backing comprising a layer of fibers with a combination of thermoplastic polymers, including a first polymer for tufting yarns and lower melting polymers in the backing, where the melting temperatures are tailored to enhance adhesion and tuft bind, using a layered structure of nonwoven or woven fibers to improve stitch holding capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pre-coat is applied to lock tufts in place, then tuft bind is improved, but recycling becomes difficult
Solution Approach 1:
The patent removes the pre-coat layer from the carpet construction, extracting the problematic element that prevented recycling while maintaining tuft bind through alternative means (tufting yarns interacting directly with the primary carpet backing)
Solution Approach 2:
The primary carpet backing serves multiple functions: it provides stitch holding capacity during tufting, maintains tuft bind without pre-coat, and enables recycling. The backing structure is designed to interact directly with tufting yarns to achieve both binding and recyclability
2Ease of manufacture
If conventional primary carpet backing is used, then manufacturing is simple, but tuft bind is insufficient under severe conditions
Solution Approach 1:
The patent employs a composite structure consisting of the primary carpet backing with specific fiber composition and the tufting yarns made from thermoplastic polymer. The interaction between these materials provides enhanced tuft bind under severe conditions while maintaining manufacturing simplicity
Solution Approach 2:
The patent specifies that tufting yarns should consist essentially of a thermoplastic polymer (polyamide, polyester, or polyolefin) with specific melting temperature characteristics. This parameter change in material composition enables the yarns to interact effectively with the primary carpet backing to provide sufficient tuft bind under severe conditions
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 provides improved tuft bind and stitch holding capacity, ensuring carpet durability and facilitating recycling by eliminating the need for latex-based pre-coats, thereby enhancing the performance and recyclability of latex-free tufted carpets.
Implementation Method 1
the primary carpet backing consists for at least 30 wt. % of one or more lower melting polymers of the same polymer family as the first polymer comprised in the tufting yarns, wherein each of the one or more lower melting polymers of the same polymer family comprised in the primary carpet backing has a melting temperature which is equal to or less than the first melting temperature
Data Source
AI summary
A primary carpet backing for latex free tufted carpets, including tufting yarns tufted into the backing, the yarns consisting essentially of a first thermoplastic polymer selected from a polyamide, a polyester or a polyolefin, the polymer having a first melting temperature, and wherein the back stitches of the tufting yarns have been at least partially melted for achieving tuft bind in the latex free tufted carpet after the melted back stitches have been cooled to room temperature, the primary carpet backing including at least a first layer of fibers, wherein the backing consists for at least 30 wt. % of one or more lower melting polymers of the same polymer family as the first polymer included in the tufting yarns and wherein each of the lower melting polymers has a melting temperature which is equal to or less than the first melting temperature.