Water-Soluble Detergent Pouch Flexibility via Plasticizer Integration
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Solution Overview
Problem
Existing water-soluble detergent pouches are prone to leakage and cracking under stress or unfavorable environmental conditions, such as cold temperatures, due to their fragile film material and difficulty in maintaining a free-flowing detergent composition during packaging and storage.
Innovation Solution
A detergent pouch is created by sealing water-soluble polymeric films with a detergent composition and incorporating a flexibility-imparting agent, such as ionic halide salts, ethylene glycol, or propylene glycol, either within the detergent composition or applied topically to the pouch, to enhance flexibility and prevent leakage and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thin water-soluble film material is used to prepare the pouch, then the pouch can release the contained product quickly and completely without residue, but the pouch becomes fragile and prone to premature release under stress or moisture
Solution Approach 1:
The patent applies composite materials by combining the water-soluble film with a water-soluble adhesive layer and incorporating flexibility-imparting agents (such as polyols, plasticizers, or viscosifiers) into the film structure. This creates a multi-layer composite where the adhesive layer provides structural support and the flexibility agents enhance toughness, allowing the thin film to maintain integrity during handling while still dissolving rapidly in water.
Solution Approach 2:
The patent changes physical and chemical parameters of the film material by adjusting the molecular weight, hydrolysis degree, and composition of the water-soluble polymer. It also modifies the film's mechanical properties by adding flexibility-imparting agents that alter the polymer chain mobility and intermolecular forces, enabling the film to be both thin and resistant to cracking under stress.
2Reliability
If the pouch is made flexible to prevent cracking under stress, then the pouch can withstand handling and transportation, but the film material may become less water-soluble or leave residue
Solution Approach 1:
The patent carefully selects flexibility-imparting agents (such as polyethylene glycol, propylene glycol, or sorbitol) and controls their concentration to maintain film flexibility while preserving water solubility. These agents are chosen because they are themselves water-soluble or leave minimal residue, and they modify the film's glass transition temperature and chain flexibility without forming insoluble cross-links.
Solution Approach 2:
The patent creates a composite structure where the flexibility-imparting agent is distributed within the water-soluble matrix, forming a homogeneous composite material. This ensures that the flexibility enhancement does not create separate phases or residues, and the entire pouch structure dissolves uniformly in water.
3Measurement precision
If detergent composition is packaged in a free-flowing solid particulate form, then precise metering and dispensing is achieved, but the detergent may clump or stick during packaging, affecting precision
Solution Approach 1:
The patent introduces an anti-caking agent or flow promoter (such as silica, calcium silicate, or magnesium aluminum silicate) as an intermediary substance mixed with the detergent composition. This intermediary prevents direct contact and adhesion between detergent particles, reducing static electricity and moisture absorption, thereby maintaining free-flowing characteristics during handling and packaging operations.
Solution Approach 2:
The patent adjusts the particle size distribution, moisture content, and bulk density of the detergent composition to optimize flow properties. By controlling these parameters, the detergent maintains adequate流动性 for precise metering while resisting clumping during storage and packaging.
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 reduces pouch breakage and leakage under stress and environmental conditions, ensuring the detergent remains free-flowing and maintaining pouch flexibility over time, as demonstrated by reduced breakage rates in drop tests and varying temperature storage.
Implementation Method 1
incorporating a flexibility-imparting agent, such as ionic halide salts, ethylene glycol, or propylene glycol, either within the detergent composition or applied topically to the pouch, to enhance flexibility and prevent leakage and cracking
Implementation Method 2
water-soluble polymeric films with a detergent composition
Data Source
AI summary
An improved detergent pouch that is prepared from at least two water-soluble polymeric films, which are sealed together to contain a detergent composition therein, wherein at least one flexibility-imparting agent is mixed with the detergent composition, or coated onto the pouch to prevent leakage and cracking under stress or unfavorable environmental conditions.