Abstract: A high strength, stretched, polyethylene plastic film is described. To obtain better stretchability, the film includes an effective amount of an acetate polymer. Typically, the polyethylene film contains up to 10% of acetate polymer. A suitable acetate polymer is polyvinyl acetate. A process for the production of a high strength polyethylene plastic film including an acetate polymer is also described.

Abstract: A device for pulling up the ends of transverse-conveyed flat tubular segments during the production of sacks or bags comprises lateral support elements, which run parallel to the conveying zone and between which a slit is formed that lies in the conveying plane and beyond which the ends to be pulled up project, and comprising mechanisms for pre-opening the ends by pulling apart the tubular sides that lie on top of each other. To pull up easily the ends of the tubular segments, the support elements in one section of the conveying zone form an obtuse angle in the shape of a peaked roof behind the mechanisms for pre-opening. In this section at least one roll is positioned in such a manner at the support elements that the leading tubular edge strikes the roll.

Abstract: An ink chamber doctor, bearing two doctor blades that are arranged in the shape of a roof can be placed in position at an anilox roller of a printing machine and moved away from the same. To guarantee that the central plane of the ink chamber doctor always agrees with a diametral plane of the anilox roller so that the result is a uniform wearing of the doctor blades, the side faces of the strip-shaped housing of the ink chamber doctor bear guide means, which can be used in guides of the side members. The ink chamber doctor can be slid in the guides at least in its end region facing the anilox roller up to its positioning at said anilox roller in a plane that includes both the central plane of the ink chamber doctor and also the axis of the anilox roller. Furthermore, means for pressing the ink chamber doctor against the anilox roller and/or for holding the ink chamber doctor at the anilox roller are envisaged.

Abstract: Anilox rollers of doctor units are provided with cells, arranged over the sleeve surface along spiral lines, in order to guarantee that the wear of the doctor blades, employed at said anilox rollers, is as uniform as possible. To prevent the ink from issuing between end-sided seals and the anilox rollers, one end section is provided with narrow sections that exhibit no cells or one end section is provided with end-sided sections, on which the cells are arranged on spiral lines with shallower pitch, or one end section is provided with end sections, on which the cells are arranged on spiral lines with opposite pitch.

Abstract: A method is disclosed for winding a continuous web of material on a core mandrel, the winder comprising a cutter that actuates to provide a new end of web material. The cutter itself comprises a source of vacuum for creating an airflow around a new core mandrel between the mandrel and a guide wall which extends around at least one fourth of the mandrel surface, the airflow causing the new web end to follow the mandrel around and tuck said new end between the mandrel circumference and the tensioned web extending between the new mandrel and upstream equipment.

Abstract: Device for separating stacked flat bag pieces, comprising a supporting structure, which is pivot-mounted in a frame and is provided with a drive, and on which suction rollers can be rotated, whose drive is in a direction of rotation opposite to the supporting structure's direction of rotation. A stacking cassette is positioned in such a manner at the enveloping cylinder, described by the rows of suction elements or suction rollers that each row of suction elements in each roller pulls a bag piece from said cassette. To prevent the trailing side edges of the bag pieces from folding over, the bag pieces are held in the stacking cassette with offset cuts, facing outwardly in the direction of the axis of rotation.

Abstract: A separating device for severing perforated tube sections includes an advancing mechanism and a tearing mechanism which respectively include opposing rollers or cylinders which are situated on both sides of the tubular web to be separated and over which endless transport bands are guided. The rollers or cylinders of the tearing mechanism can be moved in the direction toward the tubular web by a control element. The opposing rollers or cylinders in the tearing mechanism are respectively situated in swivel arms that are arranged such that they swivel around swiveling axes that oppose one another in the transport direction of the tubular web and the swivel arms swivel apart in opposite directions.

Abstract: A procedure for feeding plastic granulate into the intake opening of a plastic extruder with a storage tank, and with an intermediate storage tank resting on a weighing device.

Abstract: A device for welding flatly stacked workpieces, preferably layers of tubular segments in the manufacture of sacks, by means of welds of predetermined contour in the ultrasonic welding process comprises at least one sonotrode, which is adjustable, but is stationary during the welding operation and at least one contour roller, which is assigned to said sonotrode and whose shell is provided with a contour profile, which matches the contour of the welds to be formed and which rotates at a circumferential speed that corresponds to the speed of the workpieces passing through. To weld together quite well flatly stacked workpieces, even when they tend to unfold or spread apart, the sonotrode is enclosed by a continuous belt or strap, revolving over deflecting and drive rollers. The carrying run of the belt, passing the active surface of the sonotrode, forces the workpieces to be welded against the contour roller.

Abstract: To palletize stacks of flat objects, preferably stacks of sacks or bags, the stacks are deposited in several layers one on top of the other on a pallet in such a manner that the stacks of each layer overlap at least two stacks of the layer lying underneath. To palletize stacks of flat objects with higher productivity, large packages, which comprise partially overlapping stacks, are made from at least two stacks before the stacks are deposited.

Abstract: When manufacturing bags from tubular paper sections of a single layer or multiple layers, at least one end of each flat, tubular section is expanded into a bottom square. Lateral flaps formed in this way are folded such that they overlap and partially cover corner flaps. In order to easily bond expanded bottom squares together, the regions of the tubular sections which are to be bonded together are provided with coatings of thermoplastic which are heated and pressed together.

Abstract: A printing machine, preferably a flexographic printing machine, is provided with at least one counter-pressure cylinder and with at least one printing roller and one engraved roller, whose one end floats in the frame. To intercept the free ends of the printing roller and the engraved roller during the printing operation, the bearing blocks, in which the journals of the free ends of the printing and engraved rollers are supported in the slid-in state, can be moved in guides at right angles to the printing and engraved rollers in the frame.

Abstract: An adhesive application device is provided with suspended and free floating adhesive rollers positioned on a support plate. The rollers form an adhesive chamber with a housing placed against them. The support plate is positioned in the machine frame, laterally from the adhesive rollers, so that it can be swung around a vertical shaft. The support plate is provided with support pieces, upon which the housing is attached in a removable manner, so that good accessibility is provided and so that the adhesive application device can be maintained properly and cleaned quickly in a simple manner.

Abstract: A device for transferring slips of paper from a first rotationally-driven cylinder to a second rotationally-driven cylinder. Each cylinder has a pincers-like gripper including a controlled, pivotal jaw that has the form of a blade cooperating with a rigid jaw of the same cylinder. The pivotal jaw also operates as a controlled insertion blade that slides the slips of paper into the opened gripper of the other cylinder. The structural design of the device is simplified due to the fact that the pivotal blade-shaped jaw of each cylinder is provided with a second control that can be activated on command which deactivates the control of the pincers movement of the jaw and controls the jaw in such a way that it functions as the insertion blade.

Abstract: A device for winding web-shaped material on winding sleeves into winding rolls and for unwinding winding rolls with a beam, which floats in a frame and can be rotated around a horizontal axis and at which at least two winding shafts, which are provided with drives and can be rotated around vertical axes, are mounted so as to float. To provide simple access to the winding shafts when said winding shafts are mounted so as not to oscillate, traverses are attached to the beam, said traverses supporting bearings, which can be moved between their fixable position bearing the free ends of the winding shafts and their position releasing them.

Abstract: A device for processing at least two webs of material made of paper or plastic film is provided with at least two rolls of material, each of which can be rotated in an unwind unit and from each of which a predrawing unit, comprising predrawing rollers or rolls, takes off the web and pulls it into the device. To guarantee the proper infeeding of the web into the device, even if after a sudden operating stoppage the rolls of material coast longer than the predrawing units, there is between each unwind unit and each predrawing unit one brake each, which decelerates the web and which is activated when the predrawing units are abruptly stopped or they significantly delay the infeed.

Abstract: For manufacturing cross bottom valve sacks, the ends of continuously transported tubular sections are opened out with the formation of so-called "bottom squares" with triangular corner folds lying opposite each other. A valve leaf or a valve tube is tacked onto one side of an opened-out bottom square in such a way that, after the side folds of the opened-out bottom have been folded-in with a mutual overlap, the leaf forms a valve tube leading into the inside of the sack, and with its outer end freely accessible at one side of the sack bottom. For checking the correct position of the valve leaves or of the valve tube, the valve leaf or the valve tube, or the zone of the corner fold, covered thereby when the leaf is tacked in its correct position, is provided with a mark that can be registered by a photocell device fixed to the frame. The photocell device is activated by a reference pulse when, in the manufacturing installation, the sack bottom has reached its predetermined position to be checked.

Abstract: In a gravure printing unit for a rotary press, a plate cylinder supplied with printing ink from a printing unit and an impression roller, which lies essentially at right angles to the plate cylinder, form a roller gap, through which, when the rotary press is running, sheet material that is to be printed is passed. The plate cylinder rotates in a specified direction opposite to that of the impression roller and its rotational movement is composed of a leading, rotating sector from the inking unit to the roller gap and a trailing rotating sector from the roller gap to the inking unit. By means of an auxiliary device, printing ink is supplied to the peripheral surface of the plate cylinder on the trailing, rotating sector with the help of a flexible ink-supplying apron which, follows the peripheral surface of the plate cylinder, forming an ink-filled peripheral gap.

Abstract: An adhesive applicator comprising a transfer roller is provided with a uniform layer of glue and is set against a format roller such that application members distributed over its periphery pick up glue applied in a certain format and transfer the same to workpieces to be coated with glue. To prevent that glue thrown off from the application members contaminates the apparatus and gets lost, a collection roller (2) is disposed in direction of rotation of the format roller (14) before the transfer roller (1), which collection roller forms a troughlike nip with said transfer roller (1).

Abstract: A device for grooving continuously-fed flat workpieces to form fold lines, including a slotted disc with a circumferential groove into which groove the circular edge of a grooving disc penetrates, which together with the slotted disc constitutes the grooving tool. A clamp rollers which runs off of a cylindrical section of the slotted disc prevents the free outer areas of the workpiece from being pulled into the operating grooving tool. In order to decrease structural expenditure, the clamp roller includes a cylindrical disc adjoining the grooving disc which rotates at the same rate of revolutions as the grooving disc.