Unit Dose Detergent Film Barrier Solves Solvent Migration
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Solution Overview
Problem
Unit dose detergents experience solvent migration, leading to unsightly discoloration of colored powders due to the migration of water from the liquid chamber to the powder chamber, which disperses colorants and creates aesthetic issues.
Innovation Solution
A unit dose detergent design featuring a water-soluble film with separate compartments for a liquid composition containing a non-aqueous solvent and a powder composition with a pigment and additives, where the powder composition does not contain a dye and includes a surfactant to minimize solvent migration and maintain color stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If colorant is added to the powder composition to improve aesthetics, then the visual appeal is enhanced, but water migration disperses the colorant and creates unsightly rings
Solution Approach 1:
A water-soluble film barrier is introduced as an intermediary between the liquid and powder chambers. This film allows water to pass through while blocking the migration of colorant particles from the powder to the liquid chamber, thus maintaining color stability while permitting necessary water interaction for detergent activation.
Solution Approach 2:
The detergent package is segmented into distinct liquid and powder chambers separated by a water-soluble film. This segmentation prevents direct contact and migration between components, allowing each chamber to maintain its compositional integrity while still enabling controlled interaction when the film dissolves during use.
2Stability of the object's composition
If a water-soluble film is used to separate liquid and powder chambers, then solvent migration is minimized, but the film itself must be dissolved during use
Solution Approach 1:
The water-soluble film undergoes a phase transition from solid barrier to dissolved state when exposed to water during detergent use. This phase change allows the film to serve its protective function during storage and transport, then automatically dissolve to enable proper detergent activation and mixing during the wash cycle.
3Stability of the object's composition
If pigment is used instead of dye in the powder composition, then color stability is improved, but pigment may deposit on textiles during laundry
Solution Approach 1:
The water-soluble film acts as a mediator that prevents pigment particles from leaving the powder chamber and contacting textiles. By maintaining physical separation between the pigment-containing powder and the aqueous environment until activation, the film ensures color stability while preventing harmful pigment deposition on laundry.
Solution Approach 2:
The harmful potential of pigment deposition is eliminated by extracting the pigment from direct contact with water and textiles during storage and transport. The pigment remains isolated in the powder chamber until the moment of use, at which point the protective barrier is removed and the pigment is activated in a controlled manner.
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 effectively minimizes solvent migration, preventing discoloration and maintaining the aesthetic appeal of the unit dose detergent, while ensuring the powder composition does not deposit pigment on textiles during laundry.
Implementation Method 1
Water can move between materials and will migrate from high water active materials to low water active materials. In a unit dose detergent containing both powder and water-containing liquid chambers, solvents tend to migrate from the liquid chamber to the powder chamber.
Implementation Method 2
at least one of the liquid composition and the powder composition comprises a surfactant
Data Source
AI summary
The present disclosure provides a unit dose detergent comprising a water-soluble film material comprising a first compartment that is adjacent to a second compartment and separated by at least one layer of the film. The first compartment encloses a liquid composition comprising a non-aqueous solvent, and the second compartment encloses a powder composition comprising a pigment and at least one additive selected from a salt, a flow aid, acid, enzyme, chelating agent, a polymer, and any combination thereof; such that at least one of the liquid composition and the powder composition comprises a surfactant. Also provided is a method of preparing the powder composition for use in the unit dose detergent. The method includes adding the pigment to a salt to provide a pigment-salt combination and adding a flow aid to the pigment-salt combination to form the powder composition.