Uneven Gloss: Side 2
During fusing of the 2nd side for duplex printing, when paper enters the fusing nip, the paper rises up slightly due to curling *1 which occurred during feeding of the 1st side. This causes the paper trailing edge to contact the fuser belt and results in uneven gloss.
*1 In the case of paper for which face curling occurred during fusing of the 1st side, a back curl occurs when the backside of the paper is flipped over for duplex printing. The paper enters the fuser unit with this back curl.
[A]: Curling after fusing of 1st side [B]: Curling before fusing of 2nd side (flipped over) [C]: Contact between paper and fuser belt |
This is likely to occur if:
When using thin coated paper.
When printing in a high temperature, high humidity environment and using stabilized paper.
