Electrophotographic Developer Set for Adhesive Paper Bonding
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Solution Overview
Problem
Existing electrophotographic systems face challenges in achieving strong adhesive strength while preventing print transfer when producing paper bags, as previous methods either fail to provide sufficient adhesive strength or result in print transfer due to the melting of the adhesive portion.
Innovation Solution
An electrophotographic developer set comprising a toner with a thermoplastic resin and wax, and a powder adhesive with a thermoplastic resin and wax, where the ester group concentration and wax content are optimized to prevent print transfer and enhance adhesive strength, with specific ranges for Ea, Eb, Na, and Nb to control interactions with cellulose paper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adhesive portion is sufficiently melted by heating to obtain strong adhesive strength, then adhesive strength is improved, but the image portion melts and transfers to the opposite paper
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the toner and powder adhesive compositions. The toner contains specific wax components (0.00≤Ea≤2.45 mmol/g) that provide controlled melting behavior, while the powder adhesive contains different wax components (2.50≤Eb≤3.60 mmol/g) optimized for adhesive strength. This local differentiation of material properties allows the adhesive portion to melt sufficiently for bonding while the image portion maintains structural integrity and prevents transfer.
Solution Approach 2:
The patent utilizes parameter changes by precisely controlling the ester group concentration and content ratios of wax components in both toner and powder adhesive. By adjusting these chemical parameters (Ea, Na, Eb, Nb) within specific ranges, the melting temperatures and adhesive properties are optimized to achieve the desired balance between adhesive strength and print transfer prevention.
2Temperature
If a lower limit temperature of fixing temperature for adhesive toner is lower than that of image formation toner, then the adhesive toner can be melted at temperatures where image formation toner does not melt, but strong adhesive strength cannot be obtained
Solution Approach 1:
The patent employs composite materials by formulating both the toner and powder adhesive as complex mixtures containing thermoplastic resin, wax, and other components. The toner composite has specific wax characteristics (Ea≤2.45 mmol/g) that control its melting behavior, while the powder adhesive composite has different wax characteristics (Eb≥2.50 mmol/g) optimized for adhesive strength. This composite approach allows each material to have tailored thermal and adhesive properties.
Solution Approach 2:
The patent applies partial action by using specific wax components in controlled amounts within the toner and powder adhesive formulations. The wax in the powder adhesive (with Eb≥2.50 mmol/g) is present in sufficient quantity (Nb/Na≥0.80) to provide strong adhesive strength, while the wax in the toner (with Ea≤2.45 mmol/g) is controlled to prevent excessive melting that would cause print transfer.
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 optimized developer set effectively suppresses print transfer and achieves strong adhesive strength by controlling the ester group concentrations and wax content, ensuring the powder adhesive permeates well into the paper for enhanced bonding without melting the toner image.
Implementation Method 1
the wax contained in the powder adhesive has a specific ester group concentration (2.50≤Eb≤3.60 mmol/g) that enables effective permeation into cellulose paper
Implementation Method 2
by melting of the adhesive portion... it is possible to melt the adhesive toner at a temperature at which the toner used for image formation is not melted
Data Source
AI summary
An electrophotographic developer set comprising a toner comprising a thermoplastic resin and a wax, and a powder adhesive comprising a thermoplastic resin and a wax, wherein where Ea (mmol/g) denotes an ester group concentration of the wax contained in the toner, Na (mass %) denotes a content of the wax in the toner, Eb (mmol/g) denotes an ester group concentration of the wax contained in the powder adhesive, and Nb (mass %) denotes a content of the wax in the powder adhesive, the Ea, the Na, the Eb and the Nb satisfy the following formulae: 0.00≤Ea≤2.45, 2.50≤Eb≤3.60, and 0.80≤Nb/Na.