Laminate Moisture Barrier with Pre-Conditioned Absorber
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Solution Overview
Problem
Existing laminates with barrier layers fail to completely prevent moisture penetration, particularly at the edges of sealed packaging, which can impair the quality of moisture-sensitive products.
Innovation Solution
A laminate structure with an aluminum foil barrier layer, an outer polyamide layer that reacts to water contact, and a polyolefin inner layer containing moisture-absorbing materials like calcium oxide, where the laminate is pre-conditioned by passing through a water bath to achieve a defined humidity level, ensuring the absorber material is moistened before use, preventing moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a barrier layer with high penetration-blocking effect is used, then moisture penetration through the laminate is reduced, but moisture can still penetrate through the unprotected edges in the area of seals
Solution Approach 1:
The sealing layer is segmented into multiple functional zones: a first sealing zone with moisture-absorbing material for absorbing moisture that penetrates through the barrier layer edges, and a second sealing zone without moisture-absorbing material for heat sealing. This segmentation allows the laminate to address both the barrier function and the edge protection function separately and effectively.
Solution Approach 2:
A moisture-absorbing material is introduced as an intermediary substance in the first sealing zone. This material acts as a mediator that captures moisture molecules before they can reach the packaged product, thereby enhancing the overall protection provided by the barrier layer.
2Object-affected harmful factors
If absorber material is placed close to the barrier layer, then it can effectively absorb moisture, but the outer polyamide layer reacts spontaneously to water contact and may compromise the absorber material before use
Solution Approach 1:
The laminate is pre-conditioned by controlled exposure to humidity before final use. This preliminary action allows the outer polyamide layer to absorb a controlled amount of moisture, which is then managed by the moisture-absorbing material in the sealing layer, ensuring the absorber material is ready for its protective function without being prematurely saturated.
Solution Approach 2:
The moisture-absorbing material in the first sealing zone serves as a cushioning element that is positioned in advance to capture any moisture that penetrates through the barrier layer or is absorbed by the outer polyamide layer, preventing this moisture from reaching and compromising the packaged product.
3Speed
If the outer polyamide layer is made reactive to water contact, then it responds quickly to moisture, but this spontaneity may cause uncontrolled moisture release that compromises the absorber material
Solution Approach 1:
The system creates a feedback mechanism where the outer polyamide layer's spontaneous moisture absorption is continuously monitored and regulated by the moisture-absorbing material in the first sealing zone. When the polyamide layer absorbs moisture, the moisture-absorbing material captures the excess, maintaining a balanced moisture level and preventing uncontrolled moisture release.
4Manufacturing precision
If the laminate is pre-conditioned by passing through a water bath, then the absorber material achieves a defined humidity level, but the process requires additional manufacturing steps
Solution Approach 1:
The moisture-absorbing function is merged into the sealing layer structure itself, combining the sealing function and moisture absorption function in a single integrated component. This eliminates the need for separate moisture-absorbing packages or additional conditioning equipment, as the laminate structure itself provides the moisture management capability.
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 laminate effectively maintains a defined humidity level in the absorber material, preventing moisture penetration and ensuring the quality of moisture-sensitive products by ensuring the absorber material is pre-moistened, thus enhancing the barrier effectiveness against moisture and gas penetration.
Implementation Method 1
the outer layer made of polyamide, preferably made of mono- or biaxially oriented polyamide (oPA), reacts spontaneously to water contact
Implementation Method 2
a sealing layer as an inner layer made of a polyolefin, in particular made of polyethylene (PE) or polypropylene (PP), and comprising at least one oxide from the group of alkali metals and alkaline earth metals as absorber material
Implementation Method 3
Calcium oxide (CaO) is preferably used as moisture-absorbing material with strong water binding
Implementation Method 4
a barrier layer as a barrier against water vapor and gases
Data Source
Figure 1~2
AI summary
Laminate (10) comprises: a barrier layer (24) as barrier against water vapor and gas; an outer layer (20) made from polyamide, arranged on one side of the barrier layer; a moisture absorbing absorber material (32) arranged on the second side of the barrier layer; and sealable inner layer (28) uncovering the absorber material, arranged on the second side of the barrier layer, where the laminate exhibits a given moisture ratio for preconditioning the absorber material. An independent claim is included for a procedure for adjusting the moisture ratio of a moisture absorbing material in the laminate available in the form of a band, comprising providing the laminate with water for the absorption of water in the outer layer made of polyamide.