Patent GB-442394-A (GB)
Title: Process and apparatus for the manufacture of envelopes, bags and similar articles, from blanks which require the application of adhesive on both sides
IPC: B31B70/00
Filed: 1935-01-08
Abstract: 442,394. Endless - belt conveyers. WINKLER, A., 30, Seminarstrasse, and DUNNEBIER, M., 46, Engerser Landstrasse, both in Neuwied, Germany. Jan. 8, 1935, No. 620. Convention date, March 28, 1934. [Class 78 (i)] [See also Groups XVII and XV] A process for the production of envelopes, bags, wrappers, &c. from blanks requiring an application of adhesive on both sides, particularly in dry-gummed envelopes &c. is characterized in that a layer of stepped blanks is conveyed uninterruptedly to two adhesive applying devices in succession of which the one supplies the exposed marginal surface portion of each blank on one side of the stepped layer and the other the corresponding parts on the other side of the layer with a coating of adhesive to the desired extent. The lowermost of a pile of blanks 2, supported by adjustable stops 4, is fed by an oscillating suction device 5 to the grip of intermittent rolls 6, 7 which effects the stepped formation. The stepped blanks are then fed by rolls 8, 9 to belts 12 coacting with which is an adjustable roll 14 to effect separation of the blanks by the faster running-rolls 15, 16, which present the blanks one by one to aligning fingers 17, 18 which engage the corners. Rolls 19, 20 now take up each blank and after embossing a pattern p at the edge of the closure flap v, forward it to printing cylinders 24, 25 to print a design i on one or both sides of the blank. Suction cylinders 32 now feed the printed and embossed blanks to slow moving rolls 37, 38 which effect a stepped formation again whence belts 39, 40 convey them beneath an adjustable adhesive applying device K<1> consisting of a container 52 with a narrow slit 53 governed by a slide 54. A coating of adhesive g is thus applied to the closure flaps v. Belts 55, 56 running slightly faster than the belts 39, 40, now take up the blanks slightly separating them so as to prevent them from sticking together and forward them through a hot air drying zone 73, 74 to a second adhesive applying device K<2> which applies adhesive g<1> on the reverse side of the blanks. The device K<2> consists of a dipper roll 77 and an applier roll 78, driven either by frictional contact or by spur wheels, and an adjustable roll 79, resting against roll 77, which is moved to govern the amount of adhesive to be applied. The whole device is driven separately from the main machine and is carried by levers attached to the main clutch, so that on the clutch being thrown in the applier roll 78 is lowered on to the blanks but on the clutch being thrown out it is raised away from the blanks. Since the gummer K<3> is always driven the adhesive therein is prevented from setting. The direction of movement of the roll 78 is contrary to the movement of the blanks. The blanks, now provided with adhesive on both sides at g and g<1> are now forwarded by belts 115, 116, moving slightly faster than the belts 55, 56, to again separate the blanks and prevent sticking, through a drying zone 73, 74 to fast rolls 138, 139, which, coacting with an adjustable roll 140 over belts 136, completely separate the dried blanks. Fingers 144, 145 align the blanks, which are then fed to rolls 148, 149, which crease each blank at f, the bottom-flap portions b<1> (Fig. 13) being folded over by a rail 155 and rolls 152, 154. Between rolls 156, 157 each blank is creased at f<1>, f<11> while rails 158 and slides 159 fold over the side flaps s which are gummed at k by the segment 160. The blanks are then folded at f<1> and f<11> by blades 166, 170, the portion b being folded upwardly and delivered to a stacking device 174.