The carrier, also known as the developer, is composed of magnetic powder, resin and a small amount of toner. It is stored in the “developer” of the copier. It is not consumed during the printing and copying process, but it has a service life.
After a certain life, the “magnetic force” of the carrier will decrease, and the ability to absorb toner will weaken, thereby reducing the imaging effect and causing the printing or copying to be light in color.
Why do copiers need to have a carrier?
The carrier plays the role of loading and carrying. For a copier, the function of the carrier is simply to transport the toner from the toner kit to the drum unit.
If there is no carrier, the developing roller will not be able to absorb toner, and the copier will not be able to perform normal imaging, resulting in printing and copying white paper, or machine errors.
The main role of the carrier:
1. Make the toner and the carrier charged due to friction, and have the required polarity of charge
2. Ensure the uniform distribution of the toner
3. Prevent the toner from flying and scattering
To play the above three roles and ensure the development effect, the carrier’s charging performance must be strong, the mixing ratio of the carrier and the toner must be appropriate, and the contact and stirring of the toner should be fully utilized to provide conditions for friction charging. Like the toner powder, the carrier is also divided into positive and negative types. What kind of carrier and toner to use is determined by the photosensitive material.
The copier development system is divided into: “two-component” and “single-component”. Simply put, the two-component “has a carrier” and the single-component “has no carrier”.
What is a single-component?
In a “single-component” machine, both the toner and the carrier are loaded into the “Toner Cartridge”. The machine developer itself is empty. This type of machine is easy to maintain, and there is no need to change the carrier. If the wrong “toner” is refilled, resulting in “mixed toner”, you can cleared the developer, and replace an original toner cartridge and reinitialize.
For example: Canon and Kyocera are both single-component designs. Some HP models manufactured by Canon are typical “single-component machines”.
Although “single-component” machines are easy to maintain, the printing effect is not as good as “two-component”. They have high requirements for toner quality, and compatible consumables are not easy to adapt. Because the toner cartridge is pre-loaded with carrier, the original toner is more expensive and the cost of use is higher.
What is two-component?
In a “two-component” machine, the toner and the carrier are separated, the toner is in the toner cartridge, and the carrier is installed in the developer.
Some machines use inferior toner, or the “carrier” will run when there is a problem with the machine. It is necessary to replace or fill the “carrier” in time to ensure the printing effect. During the replacement process, you need to disassemble the “developer”, pour out the used carrier, fill the new one, and then install it. The machine also needs to be initialized.
“Two-component” machines have lower requirements for toner quality. Compatible consumables are easier to adapt, and have lower cost of use. Although maintenance is troublesome, the color printing effect is good, and it is more compatible with replace toner. Xerox, Ricoh, Konica Minolta, Toshiba, Sharp, mainly are “two-component machines”.
Why do they need to be initialized?
When replacing the copier carrier, we need to initialize operations. The purpose of initializing the carrier of the copier is to charge the carrier and allow the toner and carrier to be fully mixed in the developing system, and then allow the developing magnetic roller to absorb toner to prepare for subsequent printing work.
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