Laundry detergent sheet with microcapsules
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Solution Overview
Problem
Current non-fibrous laundry detergent sheets fail to effectively deposit and maintain volatile scent characters on fabrics due to premature rupturing of friable microcapsules during the manufacturing process, leading to inadequate long-lasting freshness.
Innovation Solution
Incorporating friable microcapsules into non-fibrous laundry detergent sheets later in the manufacturing process, after the sheet formation, to minimize breakage and enhance the yield of intact microcapsules, allowing for better perfume deposition and longer-lasting fragrance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If friable microcapsules are incorporated into non-fibrous laundry detergent sheets during traditional manufacturing processes, then perfume deposition capability is improved, but microcapsule integrity deteriorates due to premature rupturing
Solution Approach 1:
The patent applies preliminary action by forming the laundry detergent sheet first without microcapsules, then adding friable microcapsules in a subsequent step after the sheet structure is already established. This sequence prevents the mechanical stress of sheet formation from rupturing the microcapsules, thereby maintaining microcapsule integrity while still achieving perfume deposition capability.
2Quantity of substance
If friable microcapsules are added early in manufacturing, then perfume incorporation is enhanced, but manufacturing yield deteriorates due to microcapsule breakage
Solution Approach 1:
The patent performs the sheet formation action preliminarily before adding microcapsules. By establishing the detergent sheet structure first and then incorporating friable microcapsules in a separate subsequent step, the process avoids exposing microcapsules to the high-stress conditions of sheet formation, thereby maintaining high manufacturing yield while achieving effective perfume incorporation.
3Ease of manufacture
If volatile perfume ingredients are used for desired scent characters, then scent quality is improved, but scent retention deteriorates due to loss during drying and laundering
Solution Approach 1:
The patent utilizes friable microcapsules as flexible thin-film enclosures for volatile perfume ingredients. These microcapsules protect the volatile scent characters during manufacturing, drying, and laundering processes, preventing loss. The flexible shell structure allows the microcapsules to remain intact until they come into contact with fabric, at which point they rupture and deposit the perfume, thereby achieving both desired scent quality and improved scent retention.
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 approach results in improved fragrance retention and a pleasant, long-lasting scent experience for users, as the microcapsules rupture mechanically during normal wear, releasing perfume and providing freshness throughout the day.
Implementation Method 1
the microcapsules rupture mechanically during normal wear, releasing perfume
Data Source
AI summary
A method of making a non-fibrous laundry detergent sheet can include dispensing a microcapsule onto a precursor non-fibrous laundry detergent sheet, wherein the precursor non-fibrous laundry detergent sheet can include: (a) at least one surfactant; (b) at least one film former; and (c) a thickness ranging from 0.1 mm to 10 mm.