Blister Package Score Patterns for Consistent Dispensing
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Solution Overview
Problem
Blister packaging technologies face challenges in achieving consistent and efficient product dispensing due to variations in push-through force, which can lead to accidental tearing of the top layer during assembly, shipping, and handling, and inconsistencies in the score line patterns affecting the integrity and ease of product release.
Innovation Solution
A blister package design featuring a polymer top layer with a score pattern comprising intersecting straight and bowed lines, optimized for a minimum of 5 inches of linear score lines, a score line to cell area ratio of at least 10.6, and a minimum of 10 intersections, promoting consistent tear propagation and reducing push-through force deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If score lines are added to promote tear propagation, then product dispensing ease is improved, but package strength and integrity deteriorate
Solution Approach 1:
The top layer is segmented into multiple score lines arranged in specific patterns (intersecting lines, concentric circles, radial patterns) that guide tear propagation. These segmented score lines control where the tear occurs while maintaining overall package integrity through the distributed pattern design.
Solution Approach 2:
The score lines create local weaknesses at specific locations and orientations throughout the top layer. By varying the density, orientation, and pattern of score lines in different regions, the package provides controlled tear initiation points while maintaining sufficient strength in non-scored areas for handling and shipping.
2Reliability
If score line pattern density is increased to reduce push-through force variation, then dispensing consistency is improved, but manufacturing complexity increases
Solution Approach 1:
The score lines are arranged in periodic, repeating patterns such as intersecting straight lines at regular intervals, concentric circles, or radial patterns. This periodic arrangement ensures consistent tear propagation characteristics across the entire package while using simple, repeatable manufacturing processes like rotary die-cutting or laser scoring.
Solution Approach 2:
The patent optimizes specific parameters of the score line pattern including line spacing (e.g., 1-5 mm intervals), line depth (partial thickness), line width, and pattern geometry (intersecting angles, circle diameters). By carefully selecting these parameters, consistent dispensing performance is achieved while keeping the manufacturing process simple and scalable.
3Reliability
If score lines are made deeper to ensure tear propagation, then tear initiation reliability is improved, but risk of accidental tearing increases
Solution Approach 1:
The score lines are pre-formed during the packaging manufacturing process at controlled depths (e.g., 20-80% of material thickness) to create predetermined tear initiation points. This preliminary action ensures that when a push-through force is applied, the tear starts reliably at the score lines rather than randomly, while the controlled depth prevents premature tearing during normal handling.
Solution Approach 2:
The score lines extend partially through the thickness of the top layer rather than completely through. This partial penetration is sufficient to guide tear propagation when force is applied, but insufficient to create weak points that would cause accidental tearing during shipping and handling. The optimal depth balances tear initiation reliability with package integrity.
Data Source
AI summary
A blister package is formed for retaining individual products. The package includes a receptacle substrate having a sealing flange and at least one receiving cell formed to retain product therein. A polymer top layer covers the cell and a portion thereof is sealed to the sealing flange. A score pattern is formed in at least one surface of the top layer and overlapping the cell. The score pattern is defined by a first plurality of score lines formed in a repeating pattern and a second plurality of score lines formed in a repeating pattern. The first and second plurality of rows overlap one another to define a plurality of intersections, with the overall score line pattern having a total linear length of the score lines per cell of at least 5 inches and a total number of score line intersections per cell of at least 10.