Recloseable Package Integrity Strip with Oblique Base Cuts
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Solution Overview
Problem
Existing package integrity features in recloseable packages often fail to break at the intended weakened section, leading to elongated strands of film hanging into the package interior, compromising the visual and audible indication of opening.
Innovation Solution
A package integrity feature comprising a strip with an elongated top portion, a relatively narrow neck portion, and a base portion, where the second cuts forming the base portion are oblique to the machine direction, providing greater strength and ensuring the strip breaks at the neck portion when the recloseable flap is lifted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the strip is made with parallel cuts in the machine direction, then the manufacturing is simple, but the strip may break below the weakened portion leaving an elongated strand
Solution Approach 1:
The patent applies asymmetry by changing the orientation of the second cuts from parallel to the machine direction to oblique angles (30-60 degrees). This asymmetric configuration creates a V-shaped base portion that provides structural stability and ensures the strip breaks at the intended neck portion rather than elsewhere, thereby resolving the reliability issue while maintaining manufacturing simplicity.
Solution Approach 2:
The patent introduces a new dimensional aspect by angling the second cuts obliquine to the machine direction rather than keeping them parallel. This dimensional change in cut orientation creates the V-shaped configuration that enhances the base portion's strength and directs the breaking point to the neck portion, solving the reliability problem without significantly complicating manufacturing.
2Reliability
If the second cuts are oblique to the machine direction, then the base portion has greater strength and breaks consistently at the neck, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the angle of the second cuts from 0 degrees (parallel to machine direction) to oblique angles between 30-60 degrees. This parameter adjustment optimizes the base portion's strength and ensures reliable breaking at the neck portion. The complexity increase is minimal as this is a straightforward parameter modification in the cutting process.
3Loss of information
If the strip breaks below the weakened portion, then the package opening indication is compromised, but the neck portion design alone is insufficient to prevent this
Solution Approach 1:
The patent applies local quality by creating different structural characteristics in different portions of the strip. The base portion has a V-shaped configuration with oblique cuts that provide greater strength, the neck portion remains narrow and weakened, and the top portion maintains its original structure. This localized differentiation ensures the strip breaks at the neck portion while maintaining overall structural integrity and reliable opening indication.
Data Source
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AI summary
A package integrity feature 70 for a recloseable package 10 is provided. The recloseable package 10 may be made from a laminate film 12 and may comprise a scored inner layer 14 having a machine direction and a scored outer layer 16 laminated together with both permanent adhesive 18 and pressure sensitive adhesive 20 to form a recloseable flap 42 that covers an opening in a package body 44. The package integrity feature 70 may be a strip of material cut into the inner layer 14 of the laminate film 12 in such a way that the strip 70 breaks when the package 10 is opened, leaving one end 72 of the strip 70 attached to the package body 44 and the opposite end 74 attached to the recloseable flap.