Three-Compartment Detergent Capsule Structure for Stable Sealing
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Solution Overview
Problem
Existing multi-compartment water-soluble detergent capsules face issues such as drooping, complex manufacturing processes, leakage, incomplete dissolution, and poor handling due to floppy seals and unequal compartment stability, leading to inefficient cleaning and consumer misuse.
Innovation Solution
A unit dose capsule design with three compartments, where the combined footprint area of the second and third compartments is between 0.8 to 2.5 times that of the first, using two sheets of water-soluble film to form a sealing web, ensuring stability and controlled dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multi-compartment capsules are made with flat sealing webs, then manufacturing is simplified, but the capsules become floppy and fold along the seal causing handling problems
Solution Approach 1:
The patent replaces flat sealing webs with curved or domed sealing surfaces. The sealing web is formed to have a convex or concave curvature that prevents folding along the seal line, giving the capsule a more three-dimensional, stable structure that maintains its shape during handling and transport.
Solution Approach 2:
The invention transitions from a two-dimensional flat sealing web to a three-dimensional curved sealing structure. By adding the dimension of curvature, the sealing web gains structural rigidity and resistance to folding while still maintaining the multi-compartment configuration.
2Reliability
If thicker film is used to prevent leakage, then sealing reliability improves, but dissolution becomes incomplete and film residue remains on garments
Solution Approach 1:
The patent optimizes the film thickness parameter to achieve a balance between sealing reliability and dissolution completeness. By carefully controlling the thickness within specific ranges, the film provides adequate sealing during storage and transport while dissolving completely during the wash cycle without leaving residue on garments.
Solution Approach 2:
The invention uses composite film structures with different properties in different regions. The sealing areas may have enhanced thickness or composition for reliability, while the compartment walls are optimized for rapid dissolution, creating a multi-functional film system that addresses both concerns.
3Stability of the object's composition
If unequal compartment sizes are used to improve stability, then structural balance improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs asymmetric compartment sizing where compartments are deliberately made unequal in size to achieve better structural balance and stability. The larger compartments provide structural support while smaller compartments accommodate specific detergent components, creating an optimized weight distribution that prevents drooping.
Solution Approach 2:
The invention incorporates preliminary balancing considerations in the design phase, where compartment sizes are pre-calculated and pre-configured to achieve optimal structural balance. This preliminary planning reduces the need for complex real-time adjustments during manufacturing, thereby managing precision requirements.
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 design enhances stability during production, transport, and consumer usage, ensuring timely release of contents during the wash cycle, reducing leakage and breakage, and improving cleaning efficiency.
Implementation Method 1
water-soluble film
Implementation Method 2
heating the film to soften it
Implementation Method 3
application of vacuum to hold the film in the moulds
Data Source
AI summary
The present invention provides a method of producing a unit dose capsule for treatment of a substrate comprising the steps of a. placing a first sheet of water-soluble polyvinyl alcohol film over a mould having sets of cavities, each set comprising three cavities arranged on the sealing plane one after the other in circumferential direction such that footprint area of the second and the third compartments is from 0.8 to 2.5 times the area of the footprint of the first compartment; b. heating and applying vacuum to the film to mould the film into the cavities and hold it in place to form three recesses in the film; a first recess, the second recess, and a third recess, the three recesses being connected to respective side recesses by the film; c. filling three different parts of a substrate treatment composition into the three recesses, the three parts together forming a full substrate treatment composition; d. sealing a second sheet of film to the first sheet of film across the formed recesses to form the sealing web comprising a peripheral sealing skirt and inter-compartment sealing webs; and e. cutting between the capsules so that a series of three compartment capsules are formed, each capsule containing a part of a substrate treatment composition in three compartments.