Delaminatable Container EVOH Layer Citrus Aroma Preservation
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Solution Overview
Problem
Conventional delaminatable containers fail to preserve the aroma of citrus-based liquids due to the delamination process, which leads to a reduction in the citrus flavor when storing such condiments.
Innovation Solution
The delaminatable container design incorporates a specific layer structure with an EVOH layer and a random copolymer outer layer, along with a valve member and fresh air inlet system, to prevent the inner layer from delaminating excessively and maintain the aroma by controlling air flow and pressure, ensuring the inner bag shrinks smoothly without exposing the contents to air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner layer delaminates from the outer layer to shrink the inner bag, then the container maintains external shape and prevents air entrance, but the citrus aroma is reduced due to excessive delamination
Solution Approach 1:
The inner layer is segmented into multiple functional layers: a peeling layer (nylon or EVOH) for controlled delamination, an adhesion layer for bonding to the outer layer, and an inner surface layer for content contact. This segmentation allows the peeling layer to delinate and create shrinkage while the adhesion layer controls the extent of delamination, preventing excessive separation that would cause aroma loss.
Solution Approach 2:
Different layers of the inner layer have different properties tailored to specific functions. The peeling layer has low adhesion to the outer layer for easy delamination, the adhesion layer has high bonding strength to control delamination extent, and the inner surface layer has appropriate properties for content contact. This local differentiation enables controlled delamination that preserves aroma.
2Stability of the object's composition
If a polyethylene resin is used for the outer layer to maintain external shape, then the container structure is stable, but the delamination process causes aroma loss
Solution Approach 1:
The container uses composite material structures: the outer layer is polyethylene for shape stability, while the inner layer is a composite of multiple layers including peeling layer, adhesion layer, and inner surface layer. The combination of these composite materials enables both shape stability and controlled delamination that preserves aroma.
3Shape
If the inner layer delaminates completely to shrink the inner bag, then the container achieves maximum shrinkage, but air may enter and expose contents to air
Solution Approach 1:
The adhesion layer acts as an intermediary between the peeling layer and the outer layer. It provides controlled adhesion that allows the peeling layer to delinate and enable inner bag shrinkage, while simultaneously preventing complete separation that would create gaps for air entry. This intermediary function ensures shrinkage without air exposure.
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
This design effectively preserves the citrus aroma of stored condiments by minimizing exposure to air and ensuring smooth delamination, enhancing the container's functionality in maintaining the quality of citrus-based liquids.
Implementation Method 1
an inner layer delaminated from an outer layer and shrunk with a decrease in the contents
Implementation Method 2
The inner layer includes a peeling layer 24 as an outermost layer made from nylon or EVOH
Implementation Method 3
a random copolymer outer layer comprising a random copolymer of propylene and a specific monomer
Data Source
Figure 1(a)~1(c)
Figure 2(a)~2(d)
Figure 3
AI summary
A delaminatable container includes an outer layer and an inner layer, an inner bag composed of the inner layer delaminating from an outer shell composed of the outer layer and being shrunk with a decrease in contents, wherein the inner layer includes an EVOH layer containing an EVOH resin on a container outer surface side, the EVOH resin has an ethylene content of 32 mol% or less, and has a modulus of elasticity in bending of 2350 MPa or less.