Clay-Coated Base Paper for Bend-Resistant Vapor Barrier Packaging
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Solution Overview
Problem
Existing vapor deposition papers suffer from degradation in barrier properties due to bending work, which compromises their gas and water vapor barrier performance.
Innovation Solution
A base paper for vapor deposition paper is developed with a clay coat layer containing an inorganic pigment and binder at a specific mass ratio, along with a resin layer, ensuring a coating amount within a certain range, to enhance and maintain barrier properties even after bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If bending work is performed on vapor deposition paper, then the paper can be shaped into desired forms, but the vapor deposition layer cracks and barrier properties degrade
Solution Approach 1:
A clay coat layer is formed on the paper substrate before the vapor deposition layer to provide a flexible buffer that prevents cracking during bending work, while the vapor deposition layer is then formed on top to provide barrier properties
Solution Approach 2:
The invention creates a composite structure consisting of paper substrate, clay coat layer with inorganic pigment and binder, and vapor deposition layer, where each layer contributes specific properties to achieve both flexibility and barrier performance
2Reliability
If a resin layer is added to protect the vapor deposition layer, then barrier properties are maintained, but the structure becomes more complex
Solution Approach 1:
The clay coat layer acts as an intermediary between the paper substrate and the vapor deposition layer, providing a flexible protective interface that prevents direct stress transmission to the vapor deposition layer
Solution Approach 2:
The binder in the clay coat layer is selected with specific glass transition temperature and melting point parameters to ensure flexibility at service temperatures while maintaining structural integrity during processing
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 base paper provides vapor deposition paper with excellent gas and water vapor barrier properties that remain intact after bending, enabling the production of packaging bags and containers with improved durability and functionality.
Implementation Method 1
a clay coat layer including an inorganic pigment and a binder, a mass ratio (inorganic pigment/binder) of the inorganic pigment to the binder in the clay coat layer is from 25/75 to 75/25
Implementation Method 2
a resin layer, wherein a mass ratio (inorganic pigment/binder) of the inorganic pigment to the binder in the clay coat layer is from 25/75 to 75/25
Implementation Method 3
a vapor deposition layer including a metal or ceramics having thickness of 1 to 1000 nm on the resin layer
Data Source
AI summary
A base paper for vapor deposition paper, the base paper including, on at least one surface of a paper substrate, a clay coat layer and a resin layer in this order on the paper substrate, in which the clay coat layer includes an inorganic pigment and a binder, the mass ratio (inorganic pigment/binder) of the inorganic pigment to the binder in the clay coat layer is from 25/75 to 75/25, and the coating amount in terms of solid content of the clay coat layer is 8 g/m2 or more and 20 g/m2 or less.