Abstract: A method and apparatus for manufacturing window envelopes is provided. After an opening has been cut in an envelope blank and glue applied around the opening, a window patch is secured over the opening and a panel secured behind the window patch. The panel serves as the rear panel of a pocket portion formed behind the window. When the envelope blank is folded and glued into its intended form, it will include both a relatively large compartment and a relatively small pocket. The window patch and pocket panel are cut from webs traveling at unequal speeds and transferred to an envelope blank through the use of cylinders having suction means therein. The patch and panel are carried by a first cylinder which rotates them to a position where they are adjacent a second cylinder. At this point, suction within the first cylinder is terminated so that the suction means within the second cylinder will draw the patch and panel thereto.

Abstract: Disclosed is a stacking device associated with a bag making machine for producing bags from thermoplastic material. The device includes a stacking station at which successive bags are accumulated in a registered pile. Creation and maintenance of a registered stack is achieved by sequentially operable clamping bars being operationally related such that at least one bar is always in contact with the bag stack as it is being accumulated. On completion of a stack, which is determined by a conventional machine cycle counter, a longitudinally travelling clamp arrangement moves the stack away from the stacking station. The disclosed device is particularly suitable to process high density polyethylene.

Abstract: An improved method of simultaneously manufacturing a plurality of envelope assemblies of the type used to affix an insert such as a shipping label to a container. A plurality of separate strips of plastic material are arranged side-by-side on a single backing sheet of plastic material. Separate layers of adhesive are affixed to portions of the backing sheet extending on either side of each strip of plastic, with a separate, removable covering strip applied to each layer of adhesive until used. Each of the separate strips of plastic material is heat sealed to the backing sheet to create an envelope and slits are cut through portions of each plastic strip to provide entry into and exit from the respective envelopes. Finally, the plastic strips and backing sheet are cut to separate the envelopes from one another.

Abstract: Apparatus for receiving a strip of flexible bags with capped spouts at longitudinally spaced intervals which are to be separated at transverse joints and then fed individually to a point of use. It includes draw rolls for drawing the strip horizontally into cooperation with a separator, means for vertically reciprocating the separator to pass through the strip and separate the leading bag therefrom, a guide channel for receiving the spout of each separated bag, and a feeding element for engaging the spout on each successive bag and arranging the spouts in predetermined spaced relationship relative to previously inserted spouts and with the leading bag in a selected position for its spout to be engaged by bag-withdrawing means.

Abstract: A plurality of multi-walled bags of flexible plastic material is formed by taking a longitudinally folded flat web of a first flexible plastic film; at least partially separating the superposed plies of said first flexible plastic film at the edge opposite the fold line and moving the film past a corona discharge electrode between the separated plies of the film to pre-treat at least a part of the inwardly facing surface of each of said two plies; taking a longitudinally folded flat web of a second flexible plastic film; corona discharge-treating the outwardly facing surfaces of the two plies of said second flexible plastic film; passing the pre-treated web of said second flexible plastic film over a diverter guide into the space between the two at least partially separated plies of said first flexible plastic film to bring the fold lines of the first and second flexible plastic film webs substantially into register with the two webs moving synchronously in a single direction; and sealing the composite of the

Abstract: A web of bag-making material has folded rectangular sheets adhered at intervals to one face by one flap of each sheet before longitudinal margins of the web are folded over, stuck to the other flap of each sheet and joined where they overlap to define a tube, whereafter sections are severed from the tube to make bags to be formed with cross-bottom closures at the ends. The size and position of the folded sheets are such that each sheet will subsequently form an internal seal for the cross-bottom closure.

Abstract: A web of bag-making material has longitudinally folded rectangular sheets adhered at intervals to one face by one flap before longitudinal margins of the web are folded over, stuck to the other flap of each sheet and joined where they overlap to define a tube, whereafter sections are severed from the tube to make bags to be formed with cross-bottom closures at the ends. The size and position of each folded sheet is such that it will subsequently form an internal seal for the respective cross-bottom closure but the sheet for the closure at one end is made as two longitudinally aligned segments of which one segment has been transversely pre-folded back onto itself to define a tab adjacent the edge of the other segment with the length of a subsequent filling valve for the bag. Following formation of the cross-bottom closures, the filling valve is formed by unfolding the pre-folded tab.

Abstract: A labelled fabric includes a wide-mesh fabric having two opposite surfaces, a first web which is guided against one of the opposite surfaces of the wide-mesh fabric and a second web which is guided against the other of the opposite surfaces of the wide-mesh fabric. The second web is provided with labelling indicia. The first and second webs are bonded to one another through the interstices of the wide-mesh fabric.

Abstract: A machine for making single and double record sleeves made respectively from one and two sheet material blanks, comprises two input lines each for cutting and creasing a blank and connectable to two first output lines each for making up single record sleeves from blanks cut and creased by the two input lines, and a second output line connectable to both input lines for making up a double record sleeve from blanks cut and creased by the two input lines, connection of the two input lines to one of the first output lines and the second output line being controlled by conditioning means having two corresponding conditions.