Flexible Packaging Structure with Built-in Tamper-Evidence
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Solution Overview
Problem
Existing flexible packaging solutions for products that need to be reopened, such as food items, often rely on external pressure-sensitive adhesive labels, which are costly, inefficient, and generate waste, while also lacking clear tamper-evidence features that can be difficult to discern and may create choking hazards.
Innovation Solution
A flexible packaging structure with built-in opening and reclose features, utilizing score lines and pressure-sensitive adhesives applied in a pattern to create a tamper-evidence mechanism where the flap's torn condition is visually apparent, eliminating the need for external labels and reducing waste by integrating the features into the packaging production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If external pressure-sensitive adhesive labels are used to enable reclosure, then reclosability is achieved, but manufacturing cost increases and waste is generated
Solution Approach 1:
The patent merges the reclosure function directly into the packaging laminate by integrating pressure-sensitive adhesive layers between the outer and inner structures, eliminating the need for separate external labels. The adhesive is applied in a pattern during laminate manufacturing, combining multiple functions (reclosure, tamper evidence, and structural integrity) into a single integrated system.
Solution Approach 2:
The pressure-sensitive adhesive is applied in a predetermined pattern during the laminate manufacturing process, before the package is assembled and used. This preliminary action ensures the reclosure function is built-in from the start, eliminating the need for subsequent label application steps and reducing manufacturing complexity.
2Ease of operation
If external labels are applied to enable reclosure, then reclosability is achieved, but manufacturing process becomes inefficient
Solution Approach 1:
The patent combines the reclosure function with the laminate manufacturing process itself. The pressure-sensitive adhesive is applied in a pattern during laminate production, and the outer and inner structures are laminated together in the same manufacturing line, eliminating the need for separate label application steps and improving overall manufacturing efficiency.
Solution Approach 2:
The adhesive pattern is established during laminate manufacturing, before the package is assembled. This preliminary action allows the reclosure function to be built-in during the primary manufacturing process, eliminating subsequent labeling steps and improving productivity.
3Reliability
If tamper-evidence features are added to the package, then consumer confidence increases, but the features are difficult to discern or create choking hazards
Solution Approach 1:
The patent uses visual contrast through color changes in the adhesive pattern to provide clear tamper evidence. The pressure-sensitive adhesive is applied in a pattern that creates visible contrast against the packaging surface, making it easy to discern whether the package has been opened. The adhesive-free regions and adhesive regions create distinct visual differences that are easily detectable.
Solution Approach 2:
The patent segments the adhesive application into specific patterns (adhesive regions and adhesive-free regions) that create visible boundaries and contrasts. This segmentation makes the tamper-evidence feature easily detectable through visual inspection, as any disruption to the pattern is clearly visible.
4Ease of operation
If score lines are made to define flaps for opening, then opening functionality is achieved, but the package lacks integrated tamper-evidence features
Solution Approach 1:
The patent merges the opening functionality (score lines defining flaps) with tamper-evidence features by applying the pressure-sensitive adhesive in a pattern that aligns with the score lines. The adhesive pattern is interrupted at the score line locations, creating visual contrasts that serve as tamper evidence while maintaining the opening functionality.
Solution Approach 2:
The patent applies different adhesive properties to different regions: adhesive regions provide reclosure functionality, while adhesive-free regions create visual contrasts for tamper evidence. The score lines are positioned to create specific visual patterns that are easily detectable, combining opening functionality with reliability.
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 a cost-effective, efficient, and waste-reducing packaging system with clear tamper-evidence, allowing for easy reclosure and ensuring product freshness by integrating opening and reclose features directly into the packaging laminate, enhancing consumer confidence through visible tamper-evidence.
Implementation Method 1
The outer structure is joined in face-to-face relation with an inner structure with the outer structure adhesively joined to the inner structure
Data Source
AI summary
A flexible packaging laminate has built-in opening/reclose and tam per-evidence features by forming the laminate from an outer structure joined in face-to-face relation to an inner structure. Score lines are formed in both structures to enable an opening to be formed through the laminate by lifting a flap or the like out of the plane of the laminate. The score line through the outer structure defines a larger opening than the score line through the inner structure, such that a marginal region of the outer structure extends beyond the edge of the opening portion of the inner structure. A pressure-sensitive adhesive is used to re-adhere the marginal region to an underlying surface of the inner structure adjacent the opening through the laminate. The outer score line includes at least one tab positioned within a heat seal region of the laminate.