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A crease is usually caused by two issues. 1 ) paper is hitting something on the way to the fuser causing a skew. This type of problem would be repeatable every page as well as causing the image to be off centre. The 2) reason is the more likely cause. A bearing on the lower (pressure roller) is beginning to seize. Causing paper not to feed straight through the fuser. This cause a wrinkle from from to back on the sheet of paper. This wrinkle although repeatable generally the wrinkle position up or down on the sheet. This gives the impression of something that is getting in the way of the sheet. If you can change your lower pressure bearings you should be ok again.
Depending on wear the tear is at determines the issue. The wrinkling paper and the look of your printer sounds like some sort of fuser issue. Recycled paper is more likely to wrinkle and the grain can cause paper to wrinkle as well. The Long grain paper is up and down the sheet and short gain is side to side on a sheet of paper. If your printer is on a long grain setting and you have the pages coming out sides ways or vice versa then your print outs can wrinkle.
ok, in this case you need do: 1) check the roller before the fuser and after it some roller old not enough firction and pressure balance 2) check the fuser press roller it could not has good tough to fuser surface, it should be no gap at all and good pressure balance on the fuser surface 3) check the fuser cleaner which maybe too dirty, or change new one if you have the parts. 4) fuser unit maybe too old if printing pagers over its life cycle hope this help you and please ask me any time.
The fuser is shot....this is the unit that uses heat and pressure to fuse the toner to the page. It is primarily when the pressure roller wears that you get crinkling and bad fusing, but I'm sure the upper sleeve has seen better days as well. These days it is (sadly) cheaper to replace this printer with a new little HP -only around $100 or so.