Blister Package Notch Tab for Child-Resistant Easy Opening
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Solution Overview
Problem
Conventional blister card packages are difficult for adults, especially seniors with impaired dexterity, to open while maintaining child resistance, and often require costly manufacturing processes.
Innovation Solution
A blister card package design featuring a notch-forming tab with converging and diverging ends spaced strategically to facilitate a two-step opening process, using conventional materials and reducing the force required for opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional blister packages use tightly sealed layers, then child resistance is improved, but ease of opening by adults deteriorates
Solution Approach 1:
The opening mechanism is segmented into multiple functional components: a tab portion for gripping, a notch for initiating the tear, and a pre-formed tear line for controlled separation. This segmentation allows the package to maintain strong sealing while providing a dedicated easy-opening path for adults.
Solution Approach 2:
The package is prepared in advance with a pre-formed tear line and notch configuration that guides the opening action. The tear line is pre-positioned and the notch is pre-formed to concentrate stress, so that when an adult applies force to the tab, the package opens along the predetermined path without requiring excessive force or dexterity.
2Ease of operation
If blister packages use rupturable closure sheets, then ease of opening is improved, but tablet damage risk increases
Solution Approach 1:
The opening action is extracted from the tablet area and relocated to the tab and tear line portion of the package. By concentrating the opening mechanism away from the tablet, the force required to open the package is applied at a distance from the medicament, preventing direct contact and potential damage to the tablet while still achieving package opening.
Solution Approach 2:
The tear line acts as an intermediary element between the opening force applied by the user and the sealed portion containing the tablet. The pre-formed tear line provides a controlled failure path that separates the opening action from the tablet protection zone, allowing the package to open without transmitting damaging forces to the medicament.
3Ease of operation
If dual compartment cavity mechanism is used, then ease of opening is improved, but manufacturing cost increases
Solution Approach 1:
The container sheet serves multiple functions: it provides the blister cavity structure, incorporates the opening mechanism with tab and notch, and defines the tear line - all in a single thermoforming step. This multi-functionality eliminates the need for separate dual compartment cavities or additional opening components, maintaining manufacturing simplicity while achieving easy opening.
Solution Approach 2:
The container sheet geometry is modified by changing the parameters of the opening mechanism (tab size, notch depth, tear line position and orientation) during the thermoforming process. These parameter changes are achieved through conventional die design and thermoforming parameters, avoiding the need for complex dual compartment structures while maintaining easy-opening functionality.
Data Source
AI summary
An improved notch-forming tab enables a blister card package comprising a medicament to be easily opened by a user. The blister card package includes a container sheet having a well formed therein; a cover sheet laminated to the container sheet and spanning the well to form a blister containing the medicament between the cover sheet and the container sheet; and a plurality of slits defining a pattern comprising a pair of legs having respective converging and diverging ends disposed adjacent the blister. The converging ends of the pair of legs are separated from one another by between about 0.1 mm and about 1 mm and are spaced from the blister. The diverging ends of the pair of legs are spaced from an adjacent edge of the blister pack. Methods of opening this and other inventive blister card packages are also described herein.