Soil Release Polymer Deposition on Stitchbonded Towels
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Solution Overview
Problem
Industrial laundry settings face challenges in effectively using soil release polymers due to their incompatibility with high alkaline wash steps, leading to ineffective soil removal and short towel lifespan, especially when exposed to oils and greases.
Innovation Solution
A method involving a high-alkaline wash solution with a soil release polymer in the first wash cycle, followed by a bleaching step and a post-treatment with a soil release polymer to deposit it onto the towel fibers, ensuring effective soil removal and stain resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soil release polymers are used in a high alkaline wash step, then soil removal effectiveness is improved, but the polymer is hydrolyzed and becomes completely ineffective
Solution Approach 1:
The patent applies preliminary action by depositing the soil release polymer onto the textile fibers before the high alkaline wash step. This pre-deposition allows the polymer to be in place and functional when the wash cycle begins, rather than being exposed to hydrolyzing conditions during application. The polymer is applied in an acidic or neutral environment that preserves it, then subsequently exposed to alkaline conditions during washing where it performs its soil-release function.
Solution Approach 2:
The patent implements beforehand cushioning by using an acidic or neutral rinse step between the alkaline wash and the polymer deposition. This intermediate step creates a protective environment that prevents the polymer from being hydrolyzed by residual alkali, cushioning it against degradation and ensuring its stability and effectiveness for soil release.
2Adaptability or versatility
If conventional SRPs are used in industrial laundry, then they are compatible with neutral pH, but they are incompatible with high alkaline wash steps required for industrial soils
Solution Approach 1:
The patent applies parameter changes by fundamentally altering the pH conditions under which the soil release polymer is applied and maintained. Instead of using conventional SRPs that work at neutral pH, the patent employs a polymer that is deposited in an acidic or neutral environment and then maintained through subsequent alkaline wash cycles. This changes the operational pH parameters to accommodate both polymer stability and industrial cleaning requirements.
3Reliability
If towels are heavily bleached to remove stains and oils, then cleanliness is improved, but towel lifespan is reduced due to degradation
Solution Approach 1:
The patent introduces an intermediary mechanism by using the soil release polymer as a protective layer on the textile fibers. This polymer intermediary prevents direct contact between aggressive cleaning agents (bleach, alkaline solutions) and the fiber structure, reducing degradation. It acts as a buffer that allows effective cleaning while protecting the underlying fabric from damage, thereby extending towel lifespan.
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 method enhances soil and stain removal, extends towel lifespan, and maintains cleanliness through multiple washing cycles while resisting re-soiling and staining.
Implementation Method 1
SRPs are polymers that are able to bind to the fibers of towels and fabrics and prevent or reduce the amount of soils such as oil and grease from adhering to those fibers
Implementation Method 2
Conventional SRPs possess a polyester backbone which is believed to be hydrolyzed in highly alkaline environments
Data Source
AI summary
A method of cleaning a soiled stitchbonded nonwoven towel, to provide hygienically-clean, odor-free towels having a non-durable soil release polymer agents on the fabrics and stitching. The method has a step of washing soiled stitchbonded nonwoven towels in a first aqueous wash solution formed from a first wash composition comprising a surfactant, a builder, an alkalinity source, and a soil release polymer, at a first alkaline pH, and at a first wash temperature sufficient to clean soil on the towels without redeposition of the soil back onto the towels or into the washing apparatus once the residual wash solution is drained. The method also has a step of treating the washed towels in a treatment solution formed from a post-wash composition comprising a soil release polymer agent, at a temperature and pH sufficient to aid in exhausting soil release polymer from the treatment solution and onto the towels or fabrics.