Image forming method and image forming device
View Patent ↗The invention relates to an image forming method and an image forming device using at least four color toners of yellow, magenta, cyan and black, and having a fixation step of fixing a toner image on a recording medium using a fixing unit, wherein the total of a dust emission amount from each toner is controlled to be not more than a specific level, and wherein just before the fixation step where the three color toners of yellow, magenta and cyan are laminated on the recording medium, a dust emission amount from the toner to be the outermost layer on the recording medium and a dust emission amount from the toner to be the lowermost layer thereon are controlled to be in a specific relationship therebetween.
1. An image forming method using at least four color toners of yellow, magenta, cyan and black, and comprising a fixation step of fixing a toner image on a recording medium using a fixing unit, wherein the total of a dust emission amount from each of the four color toners is less than 16 mg/h, and
when, of the yellow toner, the magenta toner and the cyan toner, just before the fixation step,
a dust emission amount from the toner to be the outermost layer on the recording medium is represented by A (mg/h),
a dust emission amount from the toner to be the interlayer on the recording medium is represented by B (mg/h),
a dust emission amount from the toner to be the lowermost layer on the recording medium is represented by C (mg/h),
A/C is from 1.5 to 23.7, and A, B and C each satisfy the relationship of 0.9≦A<14.2, 0.6≦B<14.2 and 0.6≦C<14.2.
2. The image forming method according to claim 1 , wherein the A/C is from 4.0 to 23.7.
3. The image forming method according to claim 1 , wherein a mean gloss value in printing solid images of yellow, magenta cyan is from 22.0 to 60.0.
4. The image forming method according to claim 1 , wherein at least one toner of the yellow, magenta, cyan and black toners contains a hydrocarbon wax.
5. The image forming method according to claim 1 , wherein the toner to be the outermost layer on the recording medium just before the fixation step contains a paraffin wax, and the toner to be the lowermost layer on the recording medium just before the fixation step contains a microcrystalline wax.
6. An image forming device using at least four color toners of yellow, magenta, cyan and black, and having a fixation step of fixing a toner image on a recording medium using a fixing unit, wherein the total of a dust emission amount from each of the four color toners is less than 16 mg/h, and
when, of the yellow toner, the magenta toner and the cyan toner, just before the fixation step,
a dust emission amount from the toner to be the outermost layer on the recording medium is represented by A (mg/h),
a dust emission amount from the toner to be the interlayer on the recording medium is represented by B (mg/h),
a dust emission amount from the toner to be the lowermost layer on the recording medium is represented by C (mg/h),
A/C is from 1.5 to 23.7, and A, B and C each satisfy the relationship of 0.9≦A<14.2, 0.6≦B<14.2 and 0.6≦C<14.2.
7. The image forming device according to claim 6 , wherein the A/C is from 4.0 to 23.7.
8. The image forming device according to claim 6 , wherein a mean gloss value in solid image printing with yellow, magenta cyan is from 22.0 to 60.0.
9. The image forming device according to claim 6 , wherein at least one toner of the yellow, magenta, cyan and black toners contains a hydrocarbon wax.
10. The image forming device according to claim 6 , wherein the toner to be the outermost layer on the recording medium just before the fixation step contains a paraffin wax, and the toner to be the lowermost layer on the recording medium just before the fixation step contains a microcrystalline wax.