Flexible Laminate Packaging With Inline Tamper-Evident Tear Tabs
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Solution Overview
Problem
Existing flexible packaging processes require pattern adhesive cylinders and precision scoring for opening and reclose features, which are inefficient and lack integrated tamper-evidence capabilities.
Innovation Solution
A flexible packaging structure with built-in opening/reclose and tamper-evidence features, achieved through inline scoring of a multi-layer laminate using pressure sensitive adhesive and score lines that form a pull tab and tear indicators, eliminating the need for pattern adhesives and separate precision scoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pattern adhesive cylinders and precision scoring devices are used to create opening and reclose features, then the package structure can be formed with functional opening flap and tabs, but the manufacturing process becomes complex and inefficient
Solution Approach 1:
The patent combines multiple manufacturing operations (adhesive application, scoring, and feature formation) into a single integrated process. The score lines are formed through the entire laminate thickness in one operation, eliminating the need for separate pattern adhesive cylinders and multiple precision scoring steps, thereby reducing device complexity and improving manufacturing efficiency
Solution Approach 2:
The score lines serve multiple functions simultaneously: they define the opening flap boundaries, create pull tabs for opening, form reclose features, and provide tamper evidence capabilities. This multi-functionality eliminates the need for separate dedicated features for each purpose, simplifying the manufacturing process while maintaining all required package functions
2Productivity
If separate precision scoring processes are used to create package integrity features, then functional opening and reclose features can be achieved, but manufacturing time and cost increase
Solution Approach 1:
The score lines are pre-formed through the entire laminate thickness during the initial scoring operation, before the package is sealed or assembled. This preliminary action ensures that all opening, reclose, and tamper evidence features are already in place, eliminating the need for subsequent precision scoring operations and reducing overall manufacturing cycle time
Solution Approach 2:
The patent merges the formation of multiple package features (opening flap, pull tabs, reclose features, and tamper evidence elements) into a single scoring operation. By creating all these features simultaneously through one pass through the laminate, the manufacturing process achieves higher productivity without sacrificing feature functionality
3Reliability
If the package structure uses traditional opening mechanisms, then opening functionality is achieved, but tamper evidence capabilities are lacking
Solution Approach 1:
The score lines serve dual purposes: they create the functional opening mechanism (defining the flap and pull tabs) and simultaneously provide tamper evidence capabilities. The interruption of score lines at strategic locations creates visible tear lines that indicate when the package has been opened, eliminating the need for separate tamper evidence features and maintaining structural simplicity while enhancing security
Solution Approach 2:
The package structure uses its own score lines and film interruptions to provide tamper evidence functionality. When the package is opened, the pre-defined score line interruptions automatically create visible tear patterns that serve as tamper evidence, without requiring additional sensors, indicators, or complex mechanisms
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 provides efficient manufacturing of packages with integral opening and reclose functions, tamper evidence, and improved hermeticity, while reducing costs and complexity.
Implementation Method 1
a pressure sensitive adhesive layer adhesively joining the outer structure and the inner structure to form a laminate
Implementation Method 2
at least one outer line of weakness formed in the outer structure, the at least one outer line of weakness defining part of an outer opening portion that is separable from the outer structure along the at least one outer line of weakness
Data Source
AI summary
A flexible laminate, packaging structure and method comprising an outer structure, an inner structure, and a pressure sensitive adhesive layer adhesively joining the outer and inner structures to form a laminate. At least one outer line of weakness is formed in the outer structure, wherein the outer line of weakness terminates in at least one tear receiving element adjacent an opening end of the laminate. A tab is defined by at least one line of weakness formed through both the outer structure and the inner structure, wherein the tab line of weakness terminates in at least one tear propagating element. A second inner line of weakness is formed in the inner structure, wherein the second inner line of weakness is disposed between the tear propagating element of the tab and the tear receiving element of the outer line of weakness.