Fusing Quality of Toner with Tunable Thermal Properties
Abstract:In electrophotogrphy, print image is obtained by fusing toner developed on latent image and transferred onto printing medium. In fusing process, heat and pressure are applied to toner when a developed image passes through a fusing nip formed between fusing roller and pressure roller. During a short dwell time in fusing nip, there occur several rheological phenomena, such as sintering toner particles, adhesion of toner onto paper, spreading of toner particles and release of molten toner from fuser. Fusing process is complex and fusing performance is determined by a wide variety of factors such as rheological properties of toner, paper characteristics, and a fuser design and fusing parameters such as temperature, speed and pressure.
This study reports the relationship between the rheological properties of toner and fusing quality. Toner is prepared from a mixture of 2 different binder resins and it has tunable thermal properties, which can be controlled by the dynamic viscoelastic properties of each resin and the ratio of resins in toner. The prepared toner has a wide range of thermal properties, such as glass transition temperature (Tg), T1/2, storage modulus, loss modulus depending on molecular weight of toner controlled by ratio of binder resins. Prepared toner is transferred onto paper in a modified color laser printer and the un-fused image is fused through a fusing apparatus. Fusing quality, such as fusing efficiency and gloss, and image quality, such as image density, are analyzed and their dependency on the rheological properties of toner is studied. This study can be useful in not only understanding the underlying principles in fusing process, but also designing toner with better fusing properties for better print quality.
Document Type: Research Article
Publication date: 2013-01-01
For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.
Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.
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