Adhesive Label Tearing Device for Package Opening
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Solution Overview
Problem
Existing packaging methods, particularly those using plastic films and papers, are difficult to open due to their tenacity and lack of gripping points, often requiring cutting tools which can damage the contents or lead to unsuitable product leakage.
Innovation Solution
An adhesive label with a precut line and non-adhesive portions is applied to the package, allowing for effective stress distribution and guiding the tearing process along a preferred rupture line, while maintaining readability of essential information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cutting tools are used to open the package, then the wrapping can be opened effectively, but the contents may be damaged or contaminated
Solution Approach 1:
A precut line is created along the sealing portion of the package before use. This preliminary action weakens the sealing structure at specific points, allowing the wrapping to be torn open easily by hand without requiring cutting tools, thereby preventing damage or contamination of the contents
Solution Approach 2:
An adhesive label with a precut line acts as an intermediary element applied to the sealing portion of the package. The precut line in the label creates a controlled weakness that facilitates tearing without directly contacting or damaging the contents, serving as a mediator between the user's opening action and the package structure
2Strength
If the wrapping material is made tenacious for better protection, then the protective function is improved, but the opening becomes difficult
Solution Approach 1:
The adhesive label is applied locally to the sealing portion of the package rather than the entire wrapping. The precut line creates a localized weakness specifically at the sealing area, allowing the rest of the wrapping to maintain its full tenacity and protective function while enabling easy opening at the sealed location
Solution Approach 2:
The precut line is pre-formed in the adhesive label during manufacturing or application. This preliminary weakening of the sealing structure allows the strong, tenacious wrapping material to be opened easily by hand tearing along the predetermined line without compromising the overall strength and protective properties of the wrapping
3Ease of operation
If adhesive label is applied to guide tearing, then the opening process is improved, but the label may obscure essential information
Solution Approach 1:
The adhesive label is applied locally to the sealing portion of the package, concentrating its function in the specific area where tearing is needed. This localized application ensures that the label's presence does not obscure essential information printed on other parts of the package, maintaining information readability while providing tearing guidance at the sealing location
Solution Approach 2:
The adhesive label includes a precut line that segments the sealing portion into distinguishable sections. This segmentation creates a visual and tactile guide for tearing, making the opening process intuitive while the label's design ensures it does not completely obscure underlying information, allowing essential details to remain partially visible or accessible
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 solution enables easy and effective opening of packages without the need for cutting tools, ensuring the integrity of the contents and maintaining readability of information post-opening.
Implementation Method 1
a base layer of the label, made at least partly adhesive on a lower side and configured so as to define at least one gripping portion and a stress-concentration and deformation-concentration area
Data Source
AI summary
A tearing device to be applied to a complete package (1, 2) is disclosed, consisting of an adhesive label having a base layer (3) provided with an adhesive portion and a terminal portion (32, 33, 34, 32′, 33′) acting as gripping edge for imparting a manual traction, the label being so arranged as to determine at least two points of localised application of the stress, or a point of application of the stress and a point of reaction to the stress, very close to each other, upon applying a traction on said terminal portion. A weakening line or a preferred-rupture line (4, 4′) may be provided, with the base layer being made of a material having an ultimate tensile strength higher than that of the wrapping sheath and a much lower tensile elongation than that of the wrapping sheath.