Flexible Sachet With Dual Opening Zones For Patch Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hair dye compositions packaged in sachets are sensitive to oxygen, risking alteration when exposed for a patch test, leading to potential misinterpretation of product quality, and existing solutions either require separate compartments or increase manufacturing costs.
Innovation Solution
A flexible sachet with welded walls and designated opening zones, including a small cross-section opening for patch testing and a larger opening for emptying, limits exposure to air and eliminates the need for a separate compartment, allowing for a reliable patch test without compromising the main product's quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sachet is opened for a patch test, then a patch test can be performed, but the composition is exposed to air and risks alteration
Solution Approach 1:
The sachet is divided into two distinct opening zones: a first opening zone with a reduced cross-section outlet passage for patch testing, and a second opening zone for complete emptying. This segmentation allows the patch test to be performed while isolating the main composition from air exposure, as the reduced outlet passage limits the amount of composition exposed to oxygen.
2Stability of the object's composition
If a separate compartment is used for patch test, then composition alteration is avoided, but manufacturing complexity and cost increase
Solution Approach 1:
The sachet employs local quality by creating a specific region with reduced cross-section (outlet passage) within the single compartment, rather than dividing the entire sachet into separate compartments. This localized modification allows the patch test function to be achieved while maintaining the simplicity of a single-compartment structure for the majority of the sachet.
3Stability of the object's composition
If a small opening is used for patch test, then composition exposure to air is limited, but the amount of composition available for test is reduced
Solution Approach 1:
The sachet design allows dynamic selection of opening mode: for patch testing, the first opening zone with reduced cross-section is used to limit air exposure; for complete emptying or when larger quantity is needed, the second opening zone can be opened. This dynamic approach adapts the sachet's opening characteristics to the specific usage requirement.
Data Source
AI summary
A flexible sachet (1) containing at least one composition, notably hair composition, has at least two walls (2a, 2b) that are welded to one another and together define at least one compartment (2) containing the composition. The sachet has a first opening zone (4) that is to be cut in order to form a first opening for dispensing a limited amount of composition in order to carry out a patch test. The sachet has welding zones (7a; 7b; 7c; 7d) on the walls that are disposed so as to delimit between them an outlet passage (3) of reduced width (Lc), communicating with said compartment (2) and extending at least partially in the first opening zone (4). The sachet has a second opening zone (6) that is to be cut in order to form a second opening for emptying the sachet, the second opening zone cutting the compartment (2) upstream of the outlet passage (3).