Multilayer Child-Resistant Blister Package with Score Line
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Solution Overview
Problem
Current child-resistant blister packaging is challenging to design as it must be difficult for young children to open while remaining accessible to adults, and existing solutions often require complex sequential steps or tools for opening.
Innovation Solution
A multilayer blister package design featuring a thermoplastic heat sealable inner layer, an oxygen and moisture barrier intermediate layer, a bite-resistant outer layer with a score line for manual detachment, and a release coating to facilitate easy opening by adults while maintaining child resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the packaging uses a simple single-layer structure that is easy for children to open, then the ease of operation is improved, but the child resistance is worsened
Solution Approach 1:
The packaging uses a multilayer composite structure consisting of an outer layer (0.75-2.0 mil polyester or nylon), an intermediate adhesive layer (0.05-0.20 mil), and an inner heat sealable layer (0.10-1.0 mil thermoplastic). This composite structure provides both child resistance through the tough outer layer and ease of opening through the controlled adhesion and score line features.
Solution Approach 2:
The outer layer is segmented by score lines that create predetermined break points, allowing the packaging to be opened in a controlled manner. The score lines divide the outer layer into sections that can be separated along defined paths, making opening easier for adults while maintaining security against children.
2Reliability
If the packaging uses a complex multilayer structure with sequential opening steps, then the child resistance is improved, but the device complexity increases
Solution Approach 1:
The multilayer composite structure achieves child resistance through material selection and layer configuration rather than complex mechanical mechanisms. The tough outer layer combined with controlled adhesion to the intermediate layer provides security without requiring complex opening sequences or additional components.
Solution Approach 2:
The adhesive layer is selectively positioned only in certain areas rather than covering the entire package, and the score lines are placed at specific locations to guide opening. This selective placement simplifies the structure by removing unnecessary adhesive coverage and focusing the opening mechanism at key points.
3Reliability
If the packaging uses thick outer layer for bite resistance, then the child resistance is improved, but the manufacturing cost increases
Solution Approach 1:
The packaging achieves bite resistance through a composite structure where a relatively thin outer layer (0.75-2.0 mil polyester or nylon) provides the necessary mechanical strength when combined with the intermediate and inner layers. This composite approach provides adequate protection without requiring excessive material thickness that would increase costs.
Solution Approach 2:
The thickness of the outer layer is optimized within a specific range (0.75-2.0 mil) to balance bite resistance and manufacturing cost. This parameter optimization ensures sufficient child resistance while avoiding excessive material usage and associated costs.
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 package effectively prevents young children from opening by requiring sequential steps while allowing adults to easily access the contents without tools, ensuring safety and convenience.
Implementation Method 1
the inner thermoplastic heat sealable layer
Implementation Method 2
a release coating disposed at least within the loop shape and between the first intermediate layer and the outer layer (this permits manual peelable detachment of the outer layer from the first intermediate layer)
Data Source
AI summary
A child-resistant blister package that is also easily opened by adults. The package includes a formed blister film and a lidstock having at least four layers: i) an inner thermoplastic heat sealable layer; ii) a first intermediate aluminum foil layer; iii) a second intermediate adhesive layer; and iv) an outer layer having a loop shaped score line therethrough. The formed blister film has at least two compartments: (i) a first blister compartment adapted for receiving a product (a); and (ii) a second blister compartment adapted for manual inward deformation activation of separation of the lidstock from itself along a score line tab area portion.