JET PRINTING - A general term for printing presses set up to print already manufactured envelopes. Allows for fast, high quality turnaround. Can print screens up to 133 lines per inch.  Tight registration at speeds of up to 60,000 impressions per hour. Allows for fast turnaround on printing of stock envelopes.

JOB JACKET ENVELOPE - A large envelope in which all aspects of a print job are kept for reference.

JOGGED - Process using vibration to keep a stack of paper in register after printing.

JUMBO ENVELOPE - A very large envelope of either open end or open side construction. Ranging in size from 9 x 16 to 24 x 36 which can be machine folded to even larger sizes, which must be hand folded. Most super size envelopes are constructed of 28 lb. to 40 lb. Kraft paper.