Flaky Pigment PVA Coating for Crispy Bread Packaging
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Solution Overview
Problem
Current packaging materials for foodstuffs, such as bread, either preserve freshness by using plastic coatings that soften the crust or keep it crispy with paper that dries out quickly, lacking a balance between maintaining crust crispness and extending shelf life.
Innovation Solution
A packaging material comprising base paper coated with a flaky pigment and polyvinyl alcohol, which achieves appropriate water and air permeability, allowing for a crispy crust while extending the product's freshness and enabling environmentally friendly recycling or composting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If plastic coating is used to prevent drying, then shelf life is extended, but crust crispness deteriorates due to softening
Solution Approach 1:
The patent applies a composite coating material consisting of biodegradable polymer and flaky pigment particles. The flaky structure creates a porous network that allows controlled water vapor transmission, preventing both excessive drying and condensation-induced softening. This composite structure resolves the contradiction by enabling shelf life extension while maintaining crust crispness through selective permeability.
Solution Approach 2:
The flaky pigment particles create a porous coating structure that controls water vapor transmission. The porous nature allows breathability preventing crust softening while still providing protection against excessive drying, thus extending shelf life without compromising crust quality.
2Object-affected harmful factors
If paper material is used to maintain crust crispness, then crust quality is preserved, but shelf life is reduced due to excessive drying
Solution Approach 1:
The biodegradable polymer combined with flaky pigment creates a composite that provides the breathability of paper while adding protective properties. The polymer matrix holds the flaky particles in a structured arrangement that controls moisture exchange, maintaining crust crispness while reducing excessive water loss to extend shelf life.
Solution Approach 2:
By changing the physical parameters of the coating through flaky particle incorporation, the material achieves optimal water vapor transmission rate. This parameter optimization allows the packaging to maintain crust crispness while controlling drying rate to extend shelf life beyond traditional paper packaging.
3Duration of action of stationary object
If plastic packaging is used to extend shelf life, then product availability increases, but environmental friendliness deteriorates due to non-biodegradability
Solution Approach 1:
The patent changes the chemical composition parameters from conventional plastics to biodegradable polymers while maintaining functional performance. The flaky pigment coating provides the necessary barrier properties for shelf life extension, and the biodegradable nature of the polymer matrix ensures environmental friendliness, resolving the contradiction between extended availability and environmental impact.
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 material maintains the crust of fresh bread crispy for a longer period while keeping the product saleable for several days, outperforming traditional plastic and paper packaging in terms of water vapor and air permeability, and can be recycled or composted.
Implementation Method 1
a coating on at least one side of the base paper, the coating comprising a flaky coating pigment and polyvinyl alcohol
Implementation Method 2
The material according to the invention can be manufactured in such a way that appropriate water permeability, water vapour permeability as well as air permeability are achieved
Data Source
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AI summary
The invention relates to a material (2) for packaging foodstuff, the material comprising paper. Said paper is base paper (4) which has been coated on at least one side with a coating (3) comprising one or more flaky coating pigments and polyvinyl alcohol, wherein the total dry weight of said flaky coating pigment and polyvinyl alcohol comprises 20 to 60 wt% of polyvinyl alcohol, and the total dry weight of said flaky coating pigment and polyvinyl alcohol constitutes at least 70 wt% of said coating (3). Furthermore, the invention relates to a food package (1) comprising said material (2).