Removable Information Sheet Toner Flat Part Size Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ultraviolet-curable pressure-sensitive compositions used in electrophotography face issues with incompatibility with toners, leading to insufficient peeling strength, excessive peeling, and adhesion problems, especially in high-humidity environments, resulting in poor removability and image quality of pressure-bonded postcards.
Innovation Solution
A method involving the formation of a toner image on a recording medium, followed by applying an energy ray-curable pressure-sensitive composition precursor and curing it with an energy ray to create a layer that is then pressure-bonded, where the size of the toner image flat part is limited to 200 μm or less to ensure optimal adhesion and removability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional ultraviolet-curable pressure-sensitive compositions are used in electrophotography, then adhesion is achieved, but peeling strength is insufficient and adhesion problems occur especially in high-humidity environments
Solution Approach 1:
The patent changes the chemical composition parameters of the pressure-sensitive composition by incorporating specific functional materials (polyester resin with carboxyl groups, silane-modified polyester resin, and specific inorganic particles) to improve both peeling strength and adhesion stability in high-humidity environments, resolving the contradiction between these two properties
Solution Approach 2:
The patent creates a composite pressure-sensitive composition combining organic resin components (polyester resin, silane-modified polyester resin) with inorganic particles (colloidal silica, fumed silica) to achieve synergistic effects that simultaneously provide sufficient peeling strength and reliable adhesion under high-humidity conditions
2Strength
If ultraviolet-curable pressure-sensitive composition is applied to toner image, then pressure bonding is achieved, but the composition peels off partially and image quality deteriorates
Solution Approach 1:
The patent modifies the composition parameters by adding specific inorganic particles (colloidal silica with 7-15 nm average particle diameter, fumed silica) that enhance the bonding interface between the pressure-sensitive composition and toner image, preventing partial peeling while maintaining image quality
Solution Approach 2:
The patent introduces silane-modified polyester resin as an intermediary component that mediates the bonding between the ultraviolet-curable pressure-sensitive composition and the toner image, ensuring strong adhesion without compromising image integrity during pressure bonding
3Strength
If toner image is pressure-bonded with ultraviolet-curable composition, then removability is reduced, but adhesion is improved
Solution Approach 1:
The patent carefully balances the composition parameters, including the ratio of polyester resin to silane-modified polyester resin (95:5 to 50:50 by mass) and the content of inorganic particles, to achieve optimal adhesion strength that allows for clean removal without residue while maintaining sufficient bonding during use
Solution Approach 2:
The patent creates local quality differences in the pressure-sensitive composition by incorporating particles with specific size distributions and resin components with different functionalities, allowing the composition to provide strong adhesion where needed while maintaining ease of removal overall
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 a removable information sheet with excellent adhesion and removability, maintaining image quality even after storage under high humidity, preventing the ultraviolet-curable pressure-sensitive composition from peeling off partially and ensuring a beautiful image upon re-peeling.
Implementation Method 1
irradiating, with an energy ray, the recording medium with the energy ray-curable pressure-sensitive composition precursor layer formed to cure the energy ray-curable pressure-sensitive composition precursor layer and form an energy ray-curable pressure-sensitive composition
Data Source
AI summary
A method for manufacturing a removable information sheet includes: forming a toner image on a recording medium; applying an energy-ray-curable pressure-sensitive composition precursor onto the medium to form an energy-ray-curable pressure-sensitive composition precursor layer; irradiating, with an energy ray, the medium to cure the layer and form an energy-ray-curable pressure-sensitive composition; and attaching faces with the composition and pressure-bonding the faces. A region size of a toner-image flat part is 200 μm or less in the image, which is determined by a measurement method including: defining a site at a depth of 2 μm or more from a surface of a solid part of the image as a recess; defining a site other than the recess as the flat part; acquiring and binarizing a micrograph of the solid part; drawing circles out of contact with the recess; and defining a largest circle diameter as the size of the flat part.