Foamed Laundry Detergent Sheet for Fast Cold-Water Dissolution
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Solution Overview
Problem
Existing laundry detergent sheets have a slow dissolution rate under low-temperature conditions, leading to insufficient stain removal performance due to their compacted structure and reduced surface area, which is exacerbated by calendering during manufacturing.
Innovation Solution
A water-only laundry detergent sheet with a high volume proportion of bubbles (50-90%) and Plateau channels formed between bubbles, utilizing specific surfactant combinations and preparation methods to enhance dissolution, including stirring, heating, foaming, and tableting processes to create microbubbles and interconnected Plateau channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If laundry detergent sheets are made from water-soluble materials and formed through calendering, then the sheets have convenient carrying and transportation properties, but the dissolution rate significantly decreases under low-temperature water conditions
Solution Approach 1:
The patent introduces a porous foam structure with bubbles and Plateau channels into the laundry detergent sheet. This porous structure increases the specific surface area and creates capillary channels that facilitate rapid water penetration and dissolution, solving the contradiction between maintaining sheet integrity for portability and enabling fast dissolution in cold water.
Solution Approach 2:
The patent transforms the traditional flat, compacted sheet structure into a three-dimensional foam structure with bubbles and interconnected Plateau channels. This dimensional transformation creates internal pathways for water penetration, dramatically accelerating dissolution without compromising the sheet's external integrity and portability.
2Stability of the object's composition
If laundry detergent sheets are formed through calendering to ensure structural integrity, then the sheets maintain their shape during handling, but the surface area exposed to water is reduced and dissolution is slowed
Solution Approach 1:
The patent creates a nested hierarchical structure where bubbles are embedded within the sheet matrix, and Plateau channels are formed between adjacent bubbles. This nested foam structure provides both structural integrity at the macro level and extensive internal surface area at the micro level, allowing the sheet to maintain shape while offering abundant water contact areas.
Solution Approach 2:
The introduction of a controlled porous foam structure with interconnected Plateau channels provides both mechanical stability and enhanced water interaction. The bubble walls maintain structural integrity, while the internal porous network dramatically increases the effective surface area for water contact and dissolution.
3Speed
If the volume proportion of bubbles is increased to 50-90% to accelerate dissolution, then the specific surface area and contact area with water increase, but the structural strength of the sheet may be compromised
Solution Approach 1:
The patent applies different properties to different parts of the structure: the bubble walls are designed with sufficient thickness and strength to maintain structural integrity, while the Plateau channels between bubbles provide the porous pathways for rapid water penetration. This local differentiation allows high bubble volume (50-90%) for fast dissolution while maintaining overall sheet strength.
Solution Approach 2:
The laundry detergent sheet is formulated as a composite material system combining surfactants, water, additives, and a foam structure. This composite approach allows the integration of multiple functions: the surfactant mixture provides cleaning action and influences foam stability, while the foam structure provides both mechanical strength and dissolution acceleration through its porous architecture.
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 accelerates dissolution to less than 45 seconds under low temperature conditions by increasing the specific surface area and contact area with water, ensuring complete dissolution and effective stain removal.
Implementation Method 1
the bubbles can increase a specific surface area of the laundry detergent sheet and enlarge a contact area with water
Implementation Method 2
Plateau channels can be formed between the bubbles, and these Plateau channels have the effect of capillaries. When the laundry detergent sheet is placed in water, water can enter an interior of the laundry detergent sheet along the Plateau channels
Implementation Method 3
raw materials for preparing the laundry detergent sheet include: a surfactant, water and additives; the laundry detergent sheet contains bubbles, and Plateau channels are formed between the bubbles
Data Source
AI summary
A water-only laundry detergent sheet and preparation method thereof. The raw materials for preparing the laundry detergent sheet includes surfactant, water and additives. The laundry detergent sheet contains bubbles, and Plateau channels are formed between the bubbles, a volume proportion of the bubbles is 50-90%. The water-only laundry detergent sheet adjusts a volume proportion of bubbles, and the bubbles can increase a specific surface area of the laundry detergent sheet and enlarge a contact area with water. Plateau channels can be formed between the bubbles, and these Plateau channels have the effect of capillaries. When the laundry detergent sheet is placed in water, water can enter an interior of the laundry detergent sheet along the Plateau channels, thereby accelerating the dissolution of the laundry detergent sheet, thereby achieving a quick-dissolving effect under low temperature conditions, so that the laundry detergent sheet can better exert a decontamination effect.