Paper Packaging with Barrier Coating for Mortars
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Solution Overview
Problem
Conventional plastic packaging for mortars and fertilizers is environmentally damaging and difficult to recycle, while alternatives that replace plastic films often compromise on storage quality and shelf life.
Innovation Solution
A paper-based packaging system that uses kraft paper sheets coated with water vapor barrier agents and optionally water repellent agents, featuring micro or nano-perforations to allow air outlet, which provides a water vapor passage rate lower than 220 g/(m2.d) and extends the shelf life of stored products without using plastic films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic films are used in packaging, then water vapor barrier performance is improved, but environmental damage increases and recyclability decreases
Solution Approach 1:
The patent changes the material parameters from plastic films to paper sheets with specific grammage ranges (50-110 g/m2) coated with water vapor barrier agents at controlled concentrations (6-20 g/m2), achieving comparable barrier performance without plastic. This parameter transformation resolves the contradiction by maintaining functionality while eliminating environmental harm.
Solution Approach 2:
The invention creates a composite packaging system combining paper sheets with water vapor barrier agents and water repellent agents. This composite structure achieves the water vapor barrier performance previously only attainable with plastic films, while using environmentally friendly, recyclable materials.
2Object-affected harmful factors
If plastic films are replaced with paper packaging, then recyclability and environmental friendliness are improved, but water vapor barrier performance deteriorates
Solution Approach 1:
The patent introduces water vapor barrier agents as intermediary substances applied to paper sheets. These agents act as mediators between the paper substrate and the external environment, providing the water vapor barrier function that pure paper lacks, while maintaining the environmental benefits of paper packaging.
Solution Approach 2:
The invention transforms paper from a naturally permeable material into an effective water vapor barrier by controlling the application parameters of barrier agents (concentration 6-20 g/m2, grammage 50-110 g/m2). This parameter optimization enables paper to achieve plastic-level barrier performance.
3Ease of operation
If perforations are added to plastic film packaging for air outlet, then air flow performance is improved, but water vapor barrier capacity is reduced
Solution Approach 1:
The patent utilizes the natural porosity of paper sheets to provide air outlet functionality without compromising water vapor barrier performance. The paper's fibrous structure allows controlled air passage while the applied barrier agents maintain water vapor resistance, eliminating the need for perforations required in plastic film packaging.
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 paper-based packaging effectively maintains or improves the storage quality and shelf life of mortars and fertilizers, achieving up to 9 months of storage without the need for plastic films, while being environmentally friendly and recyclable.
Implementation Method 1
at least one of these sheets is coated on one or the two faces with a water vapor barrier agent
Implementation Method 2
and/or water repellent agent
Data Source
AI summary
The present invention is related, in one embodiment, to a paper packaging, totally free of plastic film, with water vapor barrier and tear resistance, whereby it may present perforations in specific regions. The packaging of the present invention further presents, in one embodiment, a sheet coated on the external face thereof with a water repellent agent. The packaging of the present invention presents the property of increasing the shelf life of the stored material.