Бумага хуже присасывается вакуумом к барабану, заминается и дает большой процент отбраковки. polygr.

[оки-док]

никак не могу первую часть перевести ( paper is sucked on to cyliner by suction worse

[fianlamb]

Suction pickup of paper onto the cylinder is worse [than some other method of pickup, which should already have been mentioned], jamming(?) occurs, and the result is a high waste percentage.

[arvp]

имхо
Paper is picked-up by the suction drum worse...