Coated Printing Paper Calcium Compound Ink Fixing
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Solution Overview
Problem
Existing coated printing papers fail to achieve good ink jet printability without compromising offset printability, particularly when using pigment inks at high speeds, leading to issues like uneven printing, ink bleeding, and reduced commercial value.
Innovation Solution
The development of coated printing paper with a base paper containing calcium carbonate and a coating layer comprising ground calcium carbonate and a calcium compound, such as calcium chloride, which enhances ink fixation and absorption properties, suppressing uneven printing even at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional coated offset printing paper is used in ink jet printing at high speed, then productivity is improved, but ink fixing properties and ink absorption properties deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the coating layer by introducing a specific calcium compound and controlling the binder content, which enables the coating to simultaneously achieve high ink absorption capacity and strong adhesion, thus resolving the contradiction between printing speed and ink fixing properties
Solution Approach 2:
The patent creates a composite coating layer combining inorganic calcium compounds with organic binders in specific ratios, which synergistically provides both rapid ink absorption and strong fixation, allowing high-speed ink jet printing without sacrificing print quality
2Productivity
If conventional coated offset printing paper is used in ink jet printing at high speed, then productivity is improved, but printing quality deteriorates due to uneven printing and ink bleeding
Solution Approach 1:
The patent optimizes the chemical composition parameters including calcium compound type, binder content, and pigment distribution, which controls the capillary action and ink wettability to prevent uneven printing and bleeding while maintaining high printing speed
Solution Approach 2:
The calcium compound acts as an intermediary substance between the ink and the coating layer, facilitating uniform ink distribution and rapid absorption, thereby preventing printing defects like bleeding and uneven density during high-speed printing
3Reliability
If the amount of binder in the coating layer is reduced to improve ink absorption, then ink fixing properties are improved, but coating strength deteriorates
Solution Approach 1:
The patent changes the binder content parameter to an optimized range and introduces calcium compounds that provide structural support, allowing the coating to maintain high ink absorption capacity while preserving sufficient mechanical strength through the synergistic effect of reduced binder and calcium reinforcement
4Reliability
If a large amount of porous pigment is added to improve ink absorption, then ink absorption properties are improved, but coating strength deteriorates due to blanket piling
Solution Approach 1:
The patent optimizes the porous pigment content parameter and combines it with calcium compounds and controlled binder amounts, which prevents excessive pigment from causing blanket piling while maintaining high ink absorption capacity through the balanced formulation
5Reliability
If ink jet recording exclusive paper with high porous pigment content is used, then ink absorption properties are improved, but offset printability deteriorates
Solution Approach 1:
The patent creates a coating layer with multi-functional properties by combining calcium compounds, binders, and pigments in specific ratios, enabling the same paper to perform well in both ink jet printing (high absorption) and offset printing (good printability), thus achieving versatility across different printing methods
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 solution ensures excellent offset printability and ink jet printability, preventing uneven printing and ink bleeding, thereby maintaining the commercial value of prints even when using pigment inks at speeds of 15 m/min or more.
Implementation Method 1
the base paper and/or the coating layer contains a calcium compound other than calcium carbonate... excellent ink fixing properties and ink absorption properties
Implementation Method 2
the coating layer contains ground calcium carbonate as a pigment in an amount of 50 parts by mass or more relative to 100 parts by mass of the total of the pigment(s) in the coating layer
Data Source
AI summary
The invention provides coated printing paper having base paper and on at least one surface of the base paper, a coating layer containing a pigment and a binder as main components, wherein the base paper contains calcium carbonate, the coating layer contains ground calcium carbonate as a pigment in an amount of 50 parts by mass or more relative to 100 parts by mass of the total of the pigment(s) in the coating layer, the base paper and/or the coating layer contains a calcium compound other than calcium carbonate, and the content of calcium derived from the calcium compound is 3 mmol to 60 mmol, both inclusive, in terms of calcium ions per 1 m2 of the base paper and/or the coating layer.