DK173870B1 - Method and apparatus for foil packaging of printed matter such as newspapers - Google Patents

Description

in DK 173870 B1

The present invention relates to a method and a machine for foil packaging of newspapers and similar printed matter conveyed at high capacity e.g. from a rotary press. It is known to carry out such packaging by forming newspaper stacks from which the newspapers of considerably less capacity can be passed through a packaging station, but the invention seeks to carry out the operation on an in-line basis, e.g. with a capacity of 25-30,000 pieces / h, ie. up to 10 pcs. per. second.

10 Relevant machines that can work with fairly high capacity have already been proposed, cf. eg. JP-A-11070913 and US 4,683,708, but continued with devices for intermittently handling the newspapers to enable their foil coating to be edge welded to form the packaging.

15 This gives an associated, necessary time consumption, and when the machines must be able to work quickly, they become relatively complicated and expensive.

It is an object of the present invention to provide a packaging method in which a regular flow packaging of the printed matter can be obtained in a relatively simple manner. where these are conveyed in a fully continuous manner through a packaging device inserted in the workflow.

According to the invention, this is attainable in that the method is carried out as set forth in the characterizing part of claim 1.

The printed matter will hereby, despite a high feed rate, achieve a certain "resting time" in abutment against a relatively fixed support surface, namely the specified drum surface, which can exhibit in simple co-rotating manner the necessary tools for a transverse welding of the resilient 30, respectively. the packaging foil webs between the successively printed print items and an intersection of the connection areas concerned; it is hereby taken into account that the available residence time of the items on the drum surface will be rather short-lived by a workpiece passage on a 35-inch diameter drum, given the relatively high feed rate, so that there will be poor time for performing an otherwise conventional melt cutting of the workpiece in connection with the welding closure of the respective ends 2 DK 173870 B1 of the workpieces. However, these packaged items can still be delivered as fully separated when working with an active cut, preferably using co-rotating blades on the drum. The invention also relates to an apparatus for use in the practice of the method according to the invention, which is characterized by the characterizing part of claim 2.

The invention is explained in more detail below with reference to the drawing, which is a schematic side view of a machine according to the invention.

In the drawing, it is shown that folded newspapers 2 are conveyed hanging in a gripper conveyor 4, possibly directly from a rotary press. At site A they are released for free fall to an underlying packaging machine 6.

This machine has, as a main part, a drum body 8 with a pressure band 10 running over rollers in the form of an inlet roller 12, a drain roller 14 and a pair of outer return rollers 16, as well as bearings 18 for supply rolls 20 for two packaging foil webs 22 and 24, via top, spaced-apart rollers 26, just below site A, downstream in V formation to run against roll 12 by a backpressure roller 28, after which the now joined webs are guided about the drum 8 below the pressing belt 10 or corresponding straps. After a lower pressure roller 30, the webs are carried out as a total product 32 over a deflecting conveyor belt 34.

The drum 8 is provided with a plurality of longitudinal welding jaws 36 spaced along the drum periphery corresponding to slightly more than the hanging extent of the newspapers 2. A backpressure roller 40 or more such rollers may, if necessary, create increased welding pressure against the drum. For welding in the direction of advance of the webs 22,24, one or more welding wheels 42 are arranged on both sides of the belt conveyor 10.

In operation, the newspapers will gradually fall into the upper V-35 space between the foil webs 22 and 24, with the velocity ratios being so tuned that there will be a free space between the falling newspapers, e.g. of the order of 5 cm. The newspapers are squeezed between the foil webs and pass through the roller DK 173870 B1 3 12 for mounting on the drum 8. This has been carefully adjusted to ensure that the said spaces between the newspapers will lie just next to the welding jaws 36, which therefore may. may be slightly protruding from the drum, possibly. in a movable way.

This is in connection with a passage of one or more outer pressure rollers 40 or possibly. compressive spring systems will allow the two foil webs to be joined together and thus welded together in said spaces. Similarly, a cutting of the webs along the weld may be arranged, e.g. by means of a drum cut out and possibly longitudinal knife element. In connection with the welding of a double foil web, it is well known that a cutting can be induced by melting, but due to the high working speed and operating conditions of the apparatus shown, it cannot be expected that a such welding sharing is obtainable in a reliable way.

It is equally true that in the invention there is no basic condition that a very close welding of the newspapers must be obtained, ie. interruptions in the welding lines will be acceptable if, however, the packaging casing is suitably edge-closed to otherwise cover and enclose the contents.

The welding wheels 42 will serve to produce side edge joints on the passing casings, and these wheels will have better conditions for producing regular welding lines 25, operating outside the range where the overall web thickness varies noticeably at the passages of the newspapers and the said spaces between these.

The result will be that those with 32 designated end products will consist of individually wrapped newspapers which are delivered to the tape 34 at the same number per unit. time unit such as the one with which the newspapers arrive at the gripper conveyor 4. It may thus be natural for the products to be arranged with ridiculous arrangement on the conveyor, which can then work at a lower transport speed. Suitable control and damping means may be located at the exit of the exit roller 30.

When the apparatus, as indicated, contains spare rolls for the foil webs, it will be a simple operation to perform an effective roll change when the effective roll is being emptied, so that a new foil web can be welded to the previous web. . To the extent that this takes time at the standstill of the apparatus, the drips at A may be suspended until the apparatus is again operational and the 5 excess newspapers may be collected for delivery in unpackaged condition.

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Claims (2)

1. Method for foil packaging of newspapers and similar printed matter articles conveyed at high capacity e.g. 5 from a rotary press, in which method the articles are advanced in a hanging position by means of a gripper conveyor which causes the articles to fall into a V-shaped gap between two opposing, moving foil webs which are wider than the articles and which are joined around the articles and welded together 10 along the edges thereof, the outermost part of the web thus assembled being methodically cut, characterized in that the items of the V-shaped gap are continued in squeezed condition with the spent items lying serially between the webs at a short distance between them, 15 about a rotating drum body inside a retaining band along a welding stretch, where, when pressed against the drum from the outside, they are welded together in the transverse regions between the workpieces by means of co-rotating welding jaws on the drum body and in the longitudinal edge regions outside the workpieces, after which they are packaged. subjects are separated by the said t moving areas, preferably by means of co-rotating actuating knife means on the drum body and during continued squeezing between the drum body and said retaining belt, the items being released for delivery to conveying means by passing a retaining belt return roller. Apparatus for carrying out the method according to claim 1, characterized in that it has as its main component a drum body (8) with co-rotating, axially extending welding jaws, preferably in combination with activatable knife means, and further comprising guide rollers for a holding belt ( 10) pressing against the drum surface along a noticeable segment of the same, and guide means for applying two opposing foil webs (22, 24) via a V-35 shaped workpiece run for wrapping the drum body along said segment, and means for lengthwise welding of said foil webs along their outer edges. ISLAND