Disposable Liquid Applicator Sachet with Tear-Line Separation
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Solution Overview
Problem
Existing disposable liquid applicator sachets require significant force to open and often result in uncontrolled liquid dispensing, leading to complicated products and high production costs.
Innovation Solution
A disposable liquid applicator sachet design featuring a top sheet and base sheet with a sealed reservoir and conduit, where the applicator pad covers the outlet opening, and tear lines allow for easy unfolding to release the liquid, eliminating the need for additional components like sealed plastic bags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sealed pouch is used to hold liquid, then the liquid is protected from contamination, but opening the pouch requires great force and/or leads to uncontrolled movements
Solution Approach 1:
The applicator sachet is divided into separate functional zones: a reservoir portion for holding liquid and an applicator portion for dispensing. The seal line separates these portions, allowing the applicator to be peeled away cleanly without compromising the sealed reservoir, thus enabling easy opening while maintaining contamination protection.
Solution Approach 2:
The applicator portion is extracted as a separate component that can be removed from the sealed reservoir. This allows the user to peel away the applicator portion along a predetermined tear line without needing to force open the sealed pouch, eliminating uncontrolled movements while maintaining the integrity of the liquid-containing portion.
2Adaptability or versatility
If a sealed pouch with applicator is used, then liquid can be stored and applied, but the product becomes relatively complicated
Solution Approach 1:
The reservoir and applicator are merged into a single integrated sachet structure formed from one or more sheets. The reservoir portion and applicator portion are connected through a seal line and tear line, creating a unified product that combines storage and application functions without requiring separate containers or complex assembly mechanisms.
Solution Approach 2:
The sheets forming the sachet serve multiple functions: they contain the liquid in the reservoir portion, provide a seal to prevent leakage, define the applicator portion, and create the tear line for separation. This multi-functionality reduces the number of separate components needed, simplifying the overall product while maintaining versatility.
3Reliability
If additional components like sealed plastic bags are used, then liquid can be held prior to use, but production costs increase
Solution Approach 1:
The liquid containment function previously requiring separate sealed plastic bags is merged into the sachet sheets themselves. The sheets are sealed to form the reservoir portion, eliminating the need for additional containment components and reducing production complexity and cost while maintaining reliable liquid containment.
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 simplifies use, reduces production costs, and protects the applicator pad from contamination, enabling easy and controlled liquid application with tactile feedback, suitable for small volumes and vulnerable surfaces.
Implementation Method 1
The sharp fold blocks the conduit to such an extent that a liquid held in the reservoir is prevented from flowing into the conduit
Implementation Method 2
the applicator portion comprises a tear line on each side of the conduit, which tear lines are each located between the conduit and a sealing zone and which tear lines extend from an edge of the applicator portion up to the fold
Data Source
Figure 1~5
AI summary
The invention relates to a liquid applicator sachet comprising a top sheet sealed onto a base sheet such that the sheets define between them, in a reservoir portion, a reservoir for holding liquid, and, in an applicator portion, a conduit extending from the reservoir to an outlet opening. The sachet further comprises an applicator pad that covers said opening. The applicator portion is folded and sealed onto the reservoir portion such that a sharp fold is present between the reservoir portion and the applicator portion. The fold blocks the conduit such that a liquid held in the reservoir is prevented from flowing into the conduit. Furthermore, the applicator portion comprises a grip tab between two tear lines. By pulling the tab, the applicator portion tears along the tear lines and part of the applicator portion can be unfolded to allow liquid to flow from the reservoir into the pad.