Calcium Propionate Sizing Composition for Corrosion Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Calcium chloride, commonly used in paper making for inkjet printing, contributes to corrosion of paper manufacturing parts due to uncontrolled chloride ion levels, and other calcium salts do not effectively enhance print quality while reducing corrosion.
Innovation Solution
Using calcium propionate alone or in combination with calcium chloride, which provides beneficial soluble calcium ions while being less corrosive, and incorporating additives like starch, optical brighteners, and defoamers to create a sizing composition that reduces corrosion and improves print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If calcium chloride is used in paper sizing composition, then print quality is improved, but corrosion of manufacturing parts increases
Solution Approach 1:
The patent changes the chemical parameter by substituting calcium chloride with calcium propionate, a different calcium salt that provides the necessary calcium ions for print quality without the corrosive chloride ions. This parameter change resolves the contradiction by maintaining print quality improvement while eliminating corrosion harm.
Solution Approach 2:
The patent converts the harmful effect of chloride ions into a benefit by using calcium propionate, which provides calcium ions (the beneficial component) without chloride ions (the harmful component). The invention transforms the problem of corrosion into an opportunity to use a superior calcium salt source.
2Object-affected harmful factors
If other calcium salts are used to reduce corrosion, then corrosion is reduced, but print quality enhancement is not achieved
Solution Approach 1:
The patent identifies and changes the specific chemical parameter (calcium salt type) to calcium propionate, which uniquely satisfies both requirements: it reduces corrosion like other non-chloride calcium salts while simultaneously enhancing print quality through its specific chemical properties and solubility characteristics.
3Ease of manufacture
If chloride ion levels are not controlled, then paper making process is simpler, but corrosion contribution increases
Solution Approach 1:
The patent extracts and removes the harmful chloride ion component from the calcium salt source by using calcium propionate instead of calcium chloride. This extraction eliminates the need for chloride ion control measures while maintaining process simplicity and reducing corrosion.
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 calcium propionate-based sizing composition significantly reduces corrosion on stainless steel and carbon steel while enhancing print quality, particularly in inkjet printing, by minimizing corrosive effects and maintaining suitable pH levels.
Implementation Method 1
calcium propionate...provides the beneficial effect of soluble calcium ions
Implementation Method 2
soluble calcium ions dissolve into the ink upon contact, and facilitate rapid flocculation of the ink pigment
Implementation Method 3
calcium propionate...being less corrosive...significantly reduces corrosion on stainless steel and carbon steel
Implementation Method 4
compositions comprising a water-soluble salt of a divalent metal; a complexing agent having an affinity for the divalent metal; and an optical brightening agent
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A sizing composition includes from about 3 kg/ton to about 15 kg/ton of calcium propionate, an additive, and a balance of water. The additive is selected from the group consisting of starch, an optical brightener, a biocide, a defoamer, a surface size agent, a wet strength additive, and combinations thereof. The sizing composition has a pH ranging from 7 to 8.