Translucent Paper Base Pulp Ratio and Air Permeability
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Solution Overview
Problem
Existing methods for producing translucent paper using resin impregnation do not achieve sufficient quality, and the base paper used significantly affects the final product's quality.
Innovation Solution
The use of base paper composed mainly of softwood chemical pulp and hardwood chemical pulp, with a specific ratio and properties, such as a basis weight of 40 to 100 g/m² and air permeability of 10 to 40 seconds, which is then impregnated with a material that makes a translucent region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If glassine paper is used for translucent regions, then transparency is improved, but strength is insufficient for package applications
Solution Approach 1:
The patent uses a composite structure consisting of a base paper layer and a translucent resin layer. The base paper provides mechanical strength while the translucent resin layer provides transparency. This composite material approach allows the translucent paper to be strong enough for package applications while maintaining the transparency needed for window regions.
2Illumination intensity
If resin impregnation is applied to existing paper, then transparency is improved, but quality is insufficient without proper base paper selection
Solution Approach 1:
The patent specifies precise parameters for the base paper including basis weight (40-100 g/m²), air permeability (10-40 seconds), and pulp composition (softwood chemical pulp 50-80 wt%, hardwood chemical pulp 20-50 wt%). These controlled parameters ensure that the base paper has the optimal properties for resin impregnation, resulting in high-quality translucent paper with consistent transparency and strength.
3Strength
If translucent paper is made for packaging applications, then strength is improved, but transparency may be compromised
Solution Approach 1:
The patent creates different regions with different properties: the base paper provides strength throughout, while the translucent resin is selectively applied to create transparent window regions. This local quality approach allows different parts of the same paper product to have different functions - the base paper ensures overall strength while the resin-impregnated regions provide transparency for viewing contents.
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
This approach results in translucent paper with excellent transparency, visibility, and recyclability, making it suitable for various applications including packaging and printing.
Implementation Method 1
impregnating spaces between the fibers of paper with a resin which makes a translucent region
Data Source
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AI summary
The present invention aims to provide base paper used in translucent paper which is obtained by impregnation with a resin which makes a translucent region, translucent paper using a base paper, and a method for producing translucent paper. Base paper for translucent paper in which a region impregnated with a material which makes a translucent region becomes translucent, wherein the base paper for translucent paper mainly contains a softwood chemical pulp and a hardwood chemical pulp; wherein a ratio of the softwood chemical pulp to the hardwood chemical pulp is in a range from 75:25 to 51:49; wherein a basis weight is in a range from 40 to 100 g/m2, and wherein an air permeability is in a range from 10 to 40 seconds.