Composite Coating Layer for Retort Food Packaging
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Solution Overview
Problem
Conventional coating layers are insufficient in gas barrier properties, water vapor barrier properties, and hot-water resistance, leading to a decrease in barrier performance during retorting processes, limiting their applications, especially in food packaging.
Innovation Solution
A composite structural material is developed with a coating layer formed by reacting metal oxide and a phosphorus compound, where the infrared absorption peak at 1080 to 1130 cm−1 indicates excellent bonding, maintaining high barrier properties even after retorting. The coating liquid contains fine metal oxide particles from hydrolysis condensation, mixed with a phosphorus compound, and optionally includes a polymer and acid, ensuring robust gas and water vapor barrier performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coating layers are used, then the coating can be applied easily, but the gas barrier properties and water vapor barrier properties are insufficient and decrease after hot water treatment
Solution Approach 1:
The patent uses a composite coating layer comprising metal oxide particles (such as aluminum oxide, silicon oxide, titanium oxide) dispersed in a binder resin matrix. This composite structure combines the barrier properties of inorganic metal oxide particles with the adhesive properties of the organic binder resin, achieving both excellent gas and water vapor barrier performance and durability after hot water treatment while maintaining ease of application through coating processes.
2Reliability
If conventional coating layers are used, then the coating process is simple, but the hot-water resistance is insufficient leading to deterioration during retorting
Solution Approach 1:
The coating composition comprises metal oxide particles (providing heat resistance and barrier properties) combined with a binder resin (providing adhesion and film formation). This composite formulation enhances hot-water resistance and durability during retorting processes while maintaining a relatively simple coating application process.
Solution Approach 2:
The patent specifies particular metal oxide types (aluminum oxide, silicon oxide, titanium oxide) and their particle size ranges (0.1-10 μm) to optimize both hot-water resistance and barrier properties. By controlling particle size, composition ratios, and binder resin selection, the coating achieves superior thermal stability and barrier performance without significantly complicating the coating process.
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 composite structural material exhibits superior gas barrier and water vapor barrier properties that remain effective after retorting, enabling its use in applications like food packaging without significant deterioration.
Implementation Method 1
the particles of metal oxide (A) have been obtained through hydrolysis condensation of a compound containing a metal atom to which a hydrolyzable characteristic group is bonded
Implementation Method 2
a reaction product formed by a reaction at least between a metal oxide (A) and a phosphorus compound (B)... an absorption peak due to vibration of Al—O—P group appears in the range of 1180 to 1280 cm−1
Implementation Method 3
In the infrared absorption spectrum of the layer (Y) in the range of 800 to 1400 cm−1, the wave number (n1) at which the infrared absorption reaches maximum is in the range of 1080 to 1130 cm−1
Data Source
AI summary
The composite structural material of the present invention includes a base (X) and a layer (Y) stacked on the base (X). The layer (Y) includes a reaction product (R) of a metal oxide (A) and a phosphorus compound (B). In the infrared absorption spectrum of the layer (Y) in the range of 800 to 1400 cm−1, the wave number (n1) at which the infrared absorption reaches maximum is in the range of 1080 to 1130 cm−1.