model 399 envelope machine the envelope machine consists of an unwind section 101 a cutting and shaping section 103 a dryer section 105 a repeater and accelerator section 107 a folding section 109 and a delivery section 111 the web is pulled from the unwind section 101 and is cut and shaped in the cutting and shaping section 103 from this point on the paper is no longer a continuous web but is rather a collection of individual sections these sections of paper then travel through and are processed by the various processing sections 105 109 and emerge at the delivery section 111 as completed envelopes during shutdown of the system an operator disengages the main drive shaft of the cutting and shaping section 103 to prevent any further advancement of the web into the various sections 105 111 already cut segments of paper continue through and are processed by the dryer section 105 the repeater and accelerator section 107 the folding section 109 and the delivery section 111 after all web material has been processed the sections 105 111 of the envelope machine are shut down fig2 is an elevated view of the unwind section 101 and the cutting and shaping section 103 the unwind section 101 contains an unwind roll 201 from which a web 203 is drawn the.