Bread Bag Masking Layer Controls Oil Permeation
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Solution Overview
Problem
Conventional bread bags with vegetable oil coatings are aesthetically unappealing due to excessive spreading and permeation, while mineral oil-based coatings also have aesthetic objections, and there is a need for improved moisture permeability and recyclability.
Innovation Solution
A bread bag design featuring a cellulose layer with a masking layer on one side and a vegetable oil coating on the other, where the masking layer penetrates through to the coated side, using a binder material like polyvinyl acetate or polyacrylate, and is applied in a pattern to control oil distribution and enhance moisture barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vegetable oil coating layer is applied to the outer side of the paper, then the bread bag meets recyclability and compostability requirements, but the coating spreads out too much and permeates the paper, resulting in poor appearance
Solution Approach 1:
The patent divides the coating system into two separate layers: a masking layer applied to the outer side for aesthetic purposes, and a coating layer applied to the inner side for functional purposes (recyclability and compostability). This segmentation allows each layer to perform its specific function without interfering with the other, resolving the contradiction between appearance and environmental compliance.
Solution Approach 2:
The patent applies different properties to different sides of the paper: the outer side receives a masking layer with specific aesthetic properties (opacity, color, pattern), while the inner side receives a coating layer with functional properties (moisture barrier, recyclability). This local differentiation allows the paper to satisfy both appearance requirements and environmental requirements simultaneously.
2Reliability
If a mineral oil-based coating is applied to the paper, then the coating provides a barrier layer, but the coating spreads out too much and permeates the paper, resulting in poor appearance
Solution Approach 1:
Instead of applying the coating layer to the outer side as conventionally done, the patent inverts the approach by applying the coating layer to the inner side of the paper and using a masking layer on the outer side. This inversion allows the barrier function to be maintained while eliminating the aesthetic problems caused by outer side coating application.
3Shape
If the cellulose layer has low specific weight to maintain transparency and aesthetics, then the paper remains visually appealing, but the paper becomes more porous and allows excessive oil penetration
Solution Approach 1:
The masking layer acts as an intermediary between the outer environment and the cellulose layer. It provides the necessary barrier function to prevent excessive oil penetration while allowing the cellulose layer to maintain its low specific weight and transparency. The masking layer mediates between the conflicting requirements of lightness and barrier protection.
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 solution results in an aesthetically improved bread bag with controlled moisture permeability, recyclability, and compostability, maintaining paper transparency and original color, while preventing excessive oil penetration and ensuring food freshness.
Implementation Method 1
the masking layer has penetrated through the cellulose layer to the first side
Implementation Method 2
comprises a binder material which impregnates the cellulose layer
Implementation Method 3
a coating layer for setting the moisture permeability, wherein the coating layer is situated on a first side of the cellulose layer
Implementation Method 4
comprises a binder material which impregnates the cellulose layer
Data Source
Figure 1A~2
Figure 3
AI summary
Paper, which paper comprises different layers, including a cellulose layer (13) and a coating layer (17), such as for setting the moisture permeability, wherein the coating layer is situated on a first side (11) of the cellulose layer and a masking layer (16) is present on a second side(12) of the cellulose layer, which masking layer is provided with a predetermined pattern and comprises a binder material which impregnates the cellulose layer, wherein the cellulose layer has a specific weight of at most 60 g/m2 and a Gurley (ISO5636-5) air resistance of at most 100 seconds, wherein the masking layer has penetrated through the cellulose layer to the first side.