Sealing Jaw Geometry for Fibrous Water-Soluble Detergent Seals
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Solution Overview
Problem
The challenge lies in creating a water-soluble unit dose article with a fibrous non-woven sheet that contains granular laundry detergent, particularly with perfume particles, which maintains a reliable seal to prevent leakage during storage and transportation while ensuring rapid dissolution during a laundry cycle, as perfume components can compromise seal integrity and prolong dilution time.
Innovation Solution
The solution involves using sealing jaws with specific characteristics, such as a protruding portion on the jaws and a non-stick coating, to form a mechanically reliable seal with a water-soluble fibrous non-woven sheet, ensuring the compartment does not leak during storage and dissolves rapidly during a wash cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal compartment is made solid and robust to prevent leakage, then sealing reliability is improved, but dilution time increases and dissolution becomes slower
Solution Approach 1:
The sealing jaws are designed with differentiated zones: a first zone with enhanced sealing capability (protruding portion, non-stick coating) to ensure reliable sealing, and a second zone optimized for rapid dissolution. This local differentiation allows the seal to be robust where needed while maintaining overall rapid dissolvability of the compartment.
2Ease of manufacture
If perfume particles are present in the granular laundry detergent, then fabric fragrance is improved, but seal integrity deteriorates due to sticky buildup on sealing jaws
Solution Approach 1:
A non-stick coating (such as PTFE/Teflon) is applied to the sealing jaw surfaces as an intermediary layer. This coating prevents direct contact between perfume particles and the sealing jaw material, eliminating the sticky buildup problem while allowing the perfume to remain in the detergent for fabric fragrance.
Solution Approach 2:
The non-stick coating is designed as a consumable layer that can be easily replaced or re-applied. Rather than attempting to clean and maintain the sealing jaws indefinitely, the coating provides a simple, cost-effective solution that can be maintained through regular replacement, ensuring continuous seal integrity.
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 achieves a seal that is both robust against leakage and efficient in releasing the detergent contents quickly, minimizing residue on fabrics and maintaining seal integrity over time.
Implementation Method 1
a non-stick coating, to form a mechanically reliable seal
Implementation Method 2
water-soluble unit dose article comprising a water-soluble fibrous non-woven sheet
Data Source
AI summary
An example system comprises a water-soluble unit dose article comprising a fibrous non-woven sheet shaped to form a sealed internal compartment and a granular laundry detergent comprised within the internal compartment. The sheet comprises fibres which comprise polyvinyl alcohol polymer. The granular laundry detergent comprises perfume particles. The system also comprises sealing jaws, whereby at least one of the sealing jaws is a heated sealing jaw. A top seal of the internal compartment is sandwiched between the jaws. A first of said jaws comprises a protruding portion along a longitudinal direction of the seal. The protruding portion has a base along a direction perpendicular to the longitudinal direction of the seal. The base has a dimension of more than 3 times and of less than 20 times a thickness of the water-soluble fibrous non-woven sheet.