Two-Step pH-Controlled Fabric Laundering to Preserve Tensile Strength
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Solution Overview
Problem
Current laundry detergents often compromise between cleaning performance and fabric care, particularly in preserving tensile strength during the laundering process, as they either focus on cleaning efficacy or fabric preservation.
Innovation Solution
A method involving an acidic soaking step with controlled pH and surfactant concentration followed by an alkaline washing step, both with specific detergent compositions and conditions, to balance cleaning performance with fabric care by maintaining tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional laundry detergents are used, then cleaning performance is achieved, but tensile strength loss increases
Solution Approach 1:
The laundering process is divided into two separate sequential steps: an acidic soaking step followed by an alkaline washing step. This segmentation allows each step to perform its specialized function - the acidic step preserves fabric strength while the alkaline step provides cleaning, thereby resolving the contradiction between maintaining tensile strength and achieving cleaning performance.
Solution Approach 2:
The invention changes the pH parameter of the wash bath between steps - maintaining acidic pH (2.0-3.0) during soaking to preserve fabric strength, then transitioning to alkaline pH (8.0-12.0) during washing to achieve cleaning. This parameter change enables the system to optimize for fabric care in one step and cleaning in the next.
2Strength
If acidic treatment is applied to fabric, then tensile strength is preserved, but cleaning performance decreases
Solution Approach 1:
The process separates fabric care function (acidic soaking) from cleaning function (alkaline washing). By segmenting these functions into distinct steps with different pH conditions, the invention achieves both fabric strength preservation and effective cleaning without compromising either objective.
Solution Approach 2:
The acidic treatment is performed as a preliminary action before the alkaline washing step. This preliminary acidic soaking prepares the fabric by preserving its tensile strength and potentially loosening soils, making the subsequent alkaline washing more effective while maintaining fabric integrity.
3Productivity
If alkaline washing is used, then cleaning performance is improved, but tensile strength loss increases
Solution Approach 1:
The acidic soaking serves as a preliminary action that protects fabric tensile strength before the alkaline washing step. By pre-treating the fabric in acidic conditions, the invention minimizes the damaging effect of subsequent alkaline washing on fabric strength while maintaining cleaning effectiveness.
Solution Approach 2:
The washing process is segmented into two distinct pH environments - acidic for fabric protection and alkaline for cleaning. This segmentation allows the alkaline washing to perform its cleaning function while the prior acidic step has already established fabric strength preservation.
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
This method effectively enhances cleaning performance while minimizing tensile strength loss in fabrics, providing a balanced approach to both cleaning and fabric preservation.
Implementation Method 1
contacting from 10 g to 100 g of an acidic solid laundry detergent composition to from 1.0 L to 10.0 L of water to form an acidic aqueous wash bath having a pH in the range of from 2.0 to 3.0
Implementation Method 2
the alkaline solid laundry detergent composition comprises from 3.0 wt % to 50 wt % alkaline component and from 1.0 wt % to 30 wt % detersive surfactant
Implementation Method 3
contacting from 10 g to 200 g of an alkaline solid laundry detergent composition to from 1.0 L to 70 L of water to form an alkaline aqueous wash bath having a pH in the range of from 8.0 to 12.0
Data Source
AI summary
The present invention relates to a method of laundering fabric. The fabric to be laundered is subjected to a first acidic soaking step, followed by an alkaline washing step.