Tear-Proof Packaging Film With Liquid-Soluble Intermediate Layer
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Solution Overview
Problem
Existing packaging composite films for medicinal products fail to balance child safety and senior-friendliness, as they are difficult for seniors to open without tools while being resistant to child access, and require specialized cutting tools for opening.
Innovation Solution
A composite packaging film with a high-strength outer layer, a liquid-soluble intermediate layer, and a lower puncture-resistant inner layer, featuring liquid transport openings that allow easy opening by moistening, which reduces the adhesive force and mechanical stability, enabling easy peeling without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-strength cover layer is used to ensure child safety, then the packaging becomes difficult for seniors to open without tools
Solution Approach 1:
The packaging film is segmented into three functional layers: a high-strength cover layer for child safety, a liquid-soluble intermediate layer for adhesive control, and a support layer for structural integrity. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between security and ease of opening.
Solution Approach 2:
The adhesive properties of the intermediate layer change based on liquid contact. In dry state, the adhesive force is high to maintain child safety. Upon contact with liquid (saliva, water, etc.), the intermediate layer dissolves and adhesive force decreases, enabling easy opening by seniors without tools.
2Ease of operation
If the packaging is made easy to open for seniors, then child safety is compromised
Solution Approach 1:
The liquid-soluble intermediate layer acts as a mediator between the cover layer and support layer. It provides strong adhesion in dry conditions to ensure child safety, but dissolves upon liquid contact to enable easy opening for seniors, thus mediating between the two opposing requirements.
3Reliability
If cutting tools are required to open the packaging, then portability and convenience are reduced
Solution Approach 1:
The packaging film's intermediate layer automatically responds to liquid contact by dissolving and reducing adhesive force. This self-service mechanism eliminates the need for external cutting tools, allowing the packaging to be opened conveniently in any location while maintaining child safety through the high-strength cover layer.
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 film provides high child safety and senior-friendliness by maintaining mechanical stability in a dry state and allowing easy opening with liquid contact, ensuring secure packaging without the need for cutting tools.
Implementation Method 1
If the liquid comes into contact with the intermediate layer through the liquid transport openings, this dissolves at least partially. In particular, the adhesive force within the composite packaging film decreases
Implementation Method 2
For the transport of liquid from the outside to the liquid-soluble intermediate layer, liquid transport openings are also provided, which penetrate at least the top layer completely and extend in the direction of the inside at least as far as the intermediate layer
Data Source
Figure 1~2
Figure 3~5
AI summary
The packaging composite film (1) has an outer side (2) and an inner side (3). Said film further comprises a liner (5) facing the outer side (2), an inner layer (10) facing the inner side (3) and comprising a lower puncture and tear resistance than the liner (5), and an intermediate layer (6) soluble in liquid and disposed between the liner (5) and the inner layer (10). Liquid transport openings (12) are provided in order to transport liquid from the outer side (2) to the intermediate layer (6) soluble in liquid, completely penetrating the liner (5) and extending in the direction of the inner side (3) at least to the intermediate layer (6), without entering the inner layer (10). The packaging film (1) can be used for implementing a child-proof but nevertheless easily opened, and thus senior-friendly, packaging.