PET Rug Crystallinity Modification for Beck-Dyeing Colorfastness
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Solution Overview
Problem
PET rugs dyed using beck dyeing methods face challenges with dye adherence to the backing, leading to staining and crocking issues, making them unsuitable for consumer washing, especially with darker colors requiring more dye, which exacerbates the problem of excess dye remaining in the rug backing.
Innovation Solution
Incorporating polyester yarn with a crystallinity-reducing modifier, such as polybutylene adipate terephthalate (PBAT), into the PET fibers to enhance dyeability, combined with a scouring process using caustic and dispersant chemicals to remove excess dye, allowing for effective beck dyeing of PET rugs with reduced backing staining and crocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beck dyeing is used to dye PET rugs, then smaller batches of multiple colors can be manufactured efficiently, but the backing becomes stained and the rug cannot be washed by consumers
Solution Approach 1:
The patent changes the chemical parameters of the polyester fiber by incorporating a crystallinity-reducing modifier that lowers the fiber's crystallinity. This parameter change increases dye penetration and uptake during beck dyeing, allowing the fiber to absorb sufficient dye without requiring excessive dye that would stain the backing. The modified fiber achieves proper dye saturation at lower dye concentrations, enabling both efficient multi-color production and washable, colorfast rugs.
2Adaptability or versatility
If darker colors are used to satisfy consumer demand for variety, then more dye is absorbed by the fiber, but excess dye remains in the backing causing increased crocking and transfer
Solution Approach 1:
The patent modifies the fiber's crystallinity parameter to enhance dye uptake efficiency. The crystallinity-reducing modifier creates a fiber structure that absorbs dye more effectively, allowing darker colors to be achieved with less total dye in the system. This reduces the amount of excess dye available to migrate to the backing and cause crocking, while still satisfying consumer demand for dark, varied colors.
Solution Approach 2:
The patent converts the typically harmful effect of high dye concentration (which causes backing saturation and crocking) into a benefit by using the crystallinity-modified fiber's enhanced uptake capacity. The fiber actively draws more dye into itself during beck dyeing, preventing dye from remaining in the backing where it would cause crocking. Thus, the same dyeing process that could cause harm instead achieves colorfastness when the fiber parameter is properly modified.
3Ease of manufacture
If conventional PET fiber is used with beck dyeing, then the process is economical for small batches, but the low dyeability requires excessive dye that stains the backing
Solution Approach 1:
The patent changes the physical-chemical parameter of the polyester fiber by reducing its crystallinity through the incorporation of a crystallinity-reducing modifier. This parameter modification increases the fiber's dyeability, allowing it to absorb dye more efficiently during beck dyeing. As a result, less total dye is required to achieve proper color saturation, reducing backing staining while maintaining the economical small-batch production advantage of beck dyeing.
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 significantly increases dyeability of PET rugs, reducing the amount of dye absorbed by the backing and facilitating a more efficient scouring process, resulting in colorfast and washable PET rugs without the issues of staining or dye transfer.
Implementation Method 1
said fibers or filaments having an average percent crystallinity of less than about 30%, and said fibers or filaments comprising a crystallinity-reducing modifier
Implementation Method 2
The process for removing excess dye following beck-dyeing is called 'scouring,' and typically involves submerging the dyed carpet or rug in caustic chemicals
Implementation Method 3
a scouring process using caustic and dispersant chemicals to remove excess dye
Data Source
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AI summary
The invention relates to cushioned rugs comprising polyester yarn, particularly polyethylene terephthalate (PET) yarn, comprising a crystallinity-reducing modifier in the polyester yarn, such as a branched polyester modifier. The invention further relates to methods of preparing such cushioned rugs.