Multi-Toner Adhesion Method Using Calorific Value Optimization
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Solution Overview
Problem
Conventional adhesion methods using a single-toner color for forming a toner layer in booklet production result in excessive toner consumption and may lead to insufficient adhesion strength and hot offset resistance when using multiple toners.
Innovation Solution
An adhesion method involving a toner set with two distinct toners, where the first toner has a lower calorific value (H1) and the second toner has a higher calorific value (H2), specifically within the ranges 6.0 ≤ H2 ≤ 24.0 J/g and H1 < H2, to achieve balanced adhesion strength and hot offset resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a toner layer for adhesion is formed using only toner of one color, then the adhesion process is simple, but the consumption amount of the specific toner increases significantly
Solution Approach 1:
The invention changes the physical and chemical parameters of the toner by introducing a specific calorific value range (H2 between 6.0-24.0 J/g and H1 < H2) to enable the toner to achieve both adhesion strength and hot offset resistance. This parameter optimization allows the toner to function effectively in multi-color printing while reducing consumption compared to single-color adhesion toner.
2Loss of substance
If a toner layer for adhesion is formed using a plurality of toners, then the consumption amount of specific toner is reduced, but the adhesion strength may become insufficient depending on the physical properties and laying sequence
Solution Approach 1:
The invention optimizes the calorific value parameters of the toner (H2 between 6.0-24.0 J/g and H1 < H2) to ensure that the toner maintains sufficient adhesion strength when used in multi-color printing. This parameter control allows the toner to properly adhere sheets while being distributed across multiple color cartridges.
Solution Approach 2:
The invention creates a composite toner system where the toner particles contain specific binder resin and wax components that work together to provide both adhesion strength and hot offset resistance. The composite structure of the toner enables it to function effectively in multi-color adhesion applications.
3Loss of substance
If a toner layer for adhesion is formed using a plurality of toners, then the consumption amount of specific toner is reduced, but hot offset may occur depending on the laying sequence of the toner layers
Solution Approach 1:
The invention changes the thermal parameters of the toner by controlling the calorific value (H2 between 6.0-24.0 J/g and H1 < H2) and adjusting the binder resin-to-wax ratio. These parameter changes enable the toner to resist hot offset while maintaining adhesion functionality in multi-color printing, eliminating the need for specific laying sequences.
4Strength
If the laying sequence of toner layers is optimized for sufficient adhesion strength, then adhesion strength is improved, but hot offset resistance deteriorates
Solution Approach 1:
The invention resolves this contradiction by changing the inherent properties of the toner material itself rather than relying on laying sequence optimization. By controlling the calorific value (H2 between 6.0-24.0 J/g and H1 < H2) and the binder resin-to-wax ratio, the toner achieves both sufficient adhesion strength and hot offset resistance simultaneously, regardless of the laying sequence in multi-color printing.
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 method effectively combines high adhesion strength with improved hot offset resistance, ensuring reliable booklet production even when using multiple toner layers.
Implementation Method 1
performing heating from a surface of the second unfixed toner layer to fix the first unfixed toner layer and the second unfixed toner layer to the sheet
Implementation Method 2
performing heating in a stacked configuration of the image pattern for adhesion formed on a same sheet or a different sheet, to adhere the sheets to each other
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
An adhesion method includes forming, on sheets, a pattern resulting from superimposing a layer of a first toner and a layer of a second toner, in this order, and heating the pattern in a state where the sheets overlap each other such that the layers of the second toner are in contact with each other, to thereby bond the sheets, wherein calorific value H1 (J/g) of the first toner and a calorific value H2 (J/g) of the second toner, in a range from 35°C to 75°C, of an exothermic peak in a DSC curve of differential scanning calorimetry of the toner, obtained through cooling after warming up to 180°C, satisfy Expressions (1) and (2) below. 6.0≤H2≤24.0 H1<H2