Toner Area Density Control for Iron-On Transfer Printing Quality
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current image forming technologies face challenges in achieving high-quality transfer printing images, particularly with iron-on transfer printing on fabrics, where issues like white-dot defects occur due to uneven toner bonding strengths.
Innovation Solution
An image forming apparatus and method that selectively control the area density of toner images on different print media, using a combination of cyan, magenta, and yellow toners, to optimize bonding during the transfer process, with specific area densities for iron-on transfer printing sheets and plain paper to ensure stable attachment and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the area density of toner is increased to improve image quality, then the image clarity improves, but the bonding strength becomes uneven causing white-dot defects
Solution Approach 1:
The patent applies different area densities of toner to different print media types. Specifically, the first area density is used for iron-on transfer printing sheets and the second area density (lower than the first) is used for plain paper. This local differentiation of toner properties resolves the contradiction by optimizing each media type individually, achieving both image clarity and bonding uniformity for each specific medium.
Solution Approach 2:
The patent changes the area density parameter of toner based on the print media type. By controlling the image forming section to use different area densities for different media, the patent optimizes the bonding strength for each medium, preventing white-dot defects while maintaining image quality. This parameter adjustment resolves the contradiction between image clarity and bonding uniformity.
2Ease of operation
If the same area density of toner is used for all print media, then the device operation is simple, but the transfer printing quality on iron-on sheets deteriorates
Solution Approach 1:
The patent introduces dynamic adjustment of toner area density based on the detected print media type. The controller automatically selects between the first area density for iron-on transfer printing sheets and the second area density for plain paper. This dynamic adaptation maintains ease of operation while significantly improving transfer printing quality on iron-on sheets.
Solution Approach 2:
The patent creates a multi-functional toner application system that can adapt to different print media types (iron-on transfer printing sheets and plain paper) by adjusting the area density. This universal approach allows the same image forming apparatus to optimally handle multiple media types, improving transfer printing quality without complicating the overall operation.
3Strength
If the area density of toner on iron-on transfer printing sheets is increased, then the adhesive force improves, but the secondary transfer to fabric becomes difficult
Solution Approach 1:
The patent precisely controls the area density parameter of toner on iron-on transfer printing sheets to an optimal range. This controlled parameter adjustment ensures sufficient adhesive force for the first transfer while maintaining appropriate secondary transferability to fabric, resolving the contradiction between strong bonding and easy secondary transfer.
Solution Approach 2:
The patent applies a controlled amount of toner (first area density) that is sufficient for achieving good adhesive force on iron-on transfer printing sheets, but not excessive to the point of preventing secondary transfer. This partial action approach optimizes both bonding strength and transferability.
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
An image forming apparatus (1) includes an image forming section (103), and a controller (700). The image forming section (103) selectively forms a first toner image (T1) to be printed on transfer paper other than plain paper with use of a toner and forms a second toner image (T2) to be printed on the plain paper with use of the toner. The controller (700) controls the image forming section (103) and thereby makes a first area density of the toner in the first toner image (T1) and a second area density of the toner in the second toner image (T2) differ from each other.