Blister Pack Cover Foil with Adsorbing Drying Agent Layer
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Solution Overview
Problem
Conventional blister packs with moisture-sensitive products face issues with moisture penetration through the edges of sealed laminates, limiting the water absorption capacity and affecting product quality, especially when packaging moisture-sensitive items like 'moist tablets'.
Innovation Solution
A cover foil with an aluminium barrier layer and a sealing layer, incorporating a plastics material layer containing a moisture-adsorbing drying agent, such as calcium oxide, which can be up to double or triple the thickness of conventional layers without compromising push-through capacity, and a buffer layer to prevent damage to the aluminium foil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the inner layer thickness is increased to improve water absorption capacity, then the water absorption capacity improves, but the push-through capacity deteriorates
Solution Approach 1:
The inner layer is divided into two distinct functional layers: a sealing layer (LDPE) that maintains push-through capacity and a drying agent layer (containing CaO) that provides water absorption. This segmentation allows each layer to optimize its specific function without compromising the other, resolving the contradiction between thickness for absorption and thickness for push-through capacity.
Solution Approach 2:
The invention uses a composite structure combining LDPE (for sealing and mechanical strength) with calcium oxide-containing material (for water absorption). This composite approach allows the packaging to simultaneously achieve both push-through capacity and enhanced water absorption capacity that neither material could provide alone.
2Quantity of substance
If the drying agent layer thickness is increased to improve water absorption capacity, then the water absorption capacity improves, but the integrity of the aluminium foil deteriorates
Solution Approach 1:
The structure separates the drying agent layer from the aluminium foil barrier layer, placing the CaO-containing layer on the inner side of the aluminium foil. This segmentation protects the aluminium foil's integrity while allowing the drying agent layer to achieve high water absorption capacity without compromising the barrier function.
Solution Approach 2:
The LDPE sealing layer acts as an intermediary between the drying agent layer and the aluminium foil. It provides a protective interface that prevents direct contact between the drying agent and the aluminium foil, thereby maintaining the integrity of the aluminium foil while allowing the drying agent layer to function effectively.
3Quantity of substance
If the inner layer thickness is increased to improve water absorption capacity, then the water absorption capacity improves, but the ease of operation deteriorates
Solution Approach 1:
By segmenting the inner layer into a sealing layer (LDPE) and a drying agent layer (CaO-containing), the invention maintains push-through ease through the thin LDPE layer while the thicker drying agent layer provides enhanced water absorption capacity. The sealing layer ensures easy operation without requiring excessive force.
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 increased thickness of the drying agent layer enhances the water absorption capacity of blister packs, ensuring better protection for moisture-sensitive products while maintaining the push-through capability, even for elderly users, without impairing the integrity of the packaging.
Implementation Method 1
an aluminium foil as a barrier layer against the penetration of water vapour and gases
Implementation Method 2
a plastics material layer containing moisture-adsorbing drying agent
Data Source
AI summary
A cover foil as a push-through foil for a blister pack for packaging moisture-sensitive products has an aluminum foil as the barrier layer against the penetration of water vapor and gases and a sealing layer for sealing against a blister base part. A plastics material layer containing moisture-adsorbing drying agent is arranged on the side of the aluminum foil provided with the sealing layer.