Metallized Base Paper Coating for Printability and Packaging Feed
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Solution Overview
Problem
Existing vapor deposition papers lack excellent printability and processing suitability for automatic packaging, particularly in packaging bags.
Innovation Solution
A base paper for vapor deposition paper is designed with a resin layer on one surface and a pigment coating layer on the other, containing specific pigment content and smoothness, along with a clay coat layer and resin composition that includes water-suspendable polyurethane-based or polyester-based resins, enhancing printability and processing suitability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vapor deposition layer is formed on a paper substrate to improve barrier properties, then oxygen and water vapor barrier properties are enhanced, but printability and processing suitability for automatic packaging deteriorate
Solution Approach 1:
The invention divides the packaging material into distinct functional layers: a paper substrate providing structural support, a resin layer providing barrier properties, and a pigment coating layer providing printability and surface properties. This segmentation allows each layer to optimize its specific function without compromising the others.
Solution Approach 2:
Different surfaces of the packaging material are given different properties: one surface has a resin layer optimized for vapor deposition and barrier properties, while the other surface has a pigment coating layer optimized for printability and surface smoothness. This local differentiation resolves the contradiction between barrier performance and processing suitability.
2Reliability
If a vapor deposition layer is formed on a paper substrate to improve barrier properties, then oxygen and water vapor barrier properties are enhanced, but printability deteriorates
Solution Approach 1:
The packaging material is segmented into functional layers with the pigment coating layer specifically designed to provide a printable surface. This layer contains pigments (50-85% by mass) and binders that create optimal surface properties for printing, while the vapor deposition layer on the opposite side provides barrier properties.
Solution Approach 2:
The pigment coating layer is applied locally on the surface designated for printing, giving that specific area different properties from the vapor deposition surface. The pigment coating provides smoothness (Oken type smoothness of 300 seconds or more) and appropriate friction characteristics for excellent printability without affecting the barrier function.
3Manufacturing precision
If the surface smoothness is increased to improve printability, then printability is enhanced, but friction characteristics for automatic packaging processing deteriorate
Solution Approach 1:
The pigment coating is formulated with specific parameters: pigment content of 50-85% by mass, binder content of 15-50% by mass, and controlled coating amount. These parameter optimizations ensure the surface has sufficient smoothness for printing while maintaining appropriate friction characteristics (coefficient of kinetic friction of 0.35 or less) for automatic packaging processing.
Solution Approach 2:
The pigment coating layer is a composite material combining pigments (such as calcium carbonate, kaolin, or titanium dioxide) with specific binders in optimized ratios. This composite structure provides both the smoothness needed for printing and the friction characteristics needed for reliable transport in automatic packaging machines.
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 improved printability and processing suitability for automatic packaging, ensuring a uniform vapor deposition layer and enhanced barrier properties.
Implementation Method 1
Vapor deposition paper is obtained by providing a vapor deposition layer made of metal or the like on a paper substrate in order to improve the barrier properties of the paper substrate against oxygen and water vapor
Data Source
AI summary
Provided are: base paper for vapor deposition paper, which has excellent printability and excellent processing suitability in automatic packaging; and vapor deposition paper formed using the base paper. The base paper for vapor deposition paper has a resin layer on one surface of a paper substrate and is for forming a vapor deposition layer on the resin layer, in which the base paper for vapor deposition paper has a pigment coating layer on the other surface of the paper substrate, a content of a pigment in the pigment coating layer is 50% by mass or more and 85% by mass or less, and the surface having the pigment coating layer has an Oken type smoothness of 300 seconds or more and a coefficient of kinetic friction against stainless steel of 0.35 or less. The vapor deposition paper has a vapor deposition layer on a resin layer of a base paper for the vapor deposition paper having the resin layer on one surface of a paper substrate and a pigment coating layer on the other surface of the paper substrate, in which a content of a pigment in the pigment coating layer is 50% by mass or more and 85% by mass or less, and the surface having the pigment coating layer has an Oken type smoothness of 300 seconds or more and a coefficient of kinetic friction against stainless steel of 0.35 or less.