EP2555916B1 - Method for continuously producing a rigid corrugated-board web, and corrugated-board formats cut to size from this web during the production thereof, and corrugated-board making installation for implementing the method - Google Patents

Description

The invention relates to a method for the continuous production of a rigid cardboard corrugated web and cut to this in the course of their production with at least one parallel longitudinal straight cutting section and with straight transverse cutting cuts tailored corrugated cardboard, wherein the dried during their production corrugated web while maintaining continuous web travel with the at least one Longitudinal section and the cross-cuts are provided in accordance with predetermined format width or format length. Such a corrugated cardboard web is produced with one or more corrugations having at least one corrugated paper web covered on both sides by a smooth paper web. The invention also relates to a corrugating machine for carrying out the method.

Out US 2662452A a generic method and a corrugating machine for carrying out the method is known.

Well-known corrugated cardboard plants (eg also EP 0 541 953 A1 ) comprise a first, a single- or multi-well corrugated cardboard from several papers joining plant section, in which at least one paper web is corrugated and glued with at least two smooth paper webs, a production line downstream second plant section, at least formed by a heating section, the longitudinal in production line Dries a corrugated board web moving at web speed moved third corrugated web, formed by a longitudinal cutting device and a cross cutting device for cutting the corrugated board formats with at least one predetermined format width determining longitudinal cutting and predetermined format length determining cross-sectional cuts, a drive and conveyor for continuous web movement of Corrugated web output at the dry end of the heating section in synchronization with the corrugated board production in the first section and a controller of the corrugating machine comprising means for controlling the cross cutter in correlation with the web speed of the corrugated board. It is a typical feature of the corrugated board at least one with two smooth paper webs on both sides closed or covered wave web having corrugated board, that the corrugated board or the corrugated board is relatively dimensionally stable. Under surface stiffness is to be understood that the corrugated board as such is non-flexible or dimensionally stable, so they can not be wound without destroying the wave structure and is only slightly bendable or bendable. The longitudinal cutting device and the transverse cutting device of the generic generation systems are provided separately from each other.

A corrugated board production plant of the known type comprises the usual sections of the plant with known machine stations and aggregates. By means of corrugating rolls, a corrugated paper web is produced under pressure and heat. Glued tip tips are glued to ceiling panels. The result is a single-walled corrugated cardboard. By adding further corrugated and smooth paper web, depending on the stability requirements, multiwave, in particular two- and three-wave corrugated cardboard are produced. After the bonding process, the single or multi-wall corrugated cardboard is dried in the so-called heating and drawing section. After leaving the heating and drawing section, the corrugated board web is cut into desired formats of specified format width and length. The corrugated web passes, for example, first a cutting machine (longitudinal cutting device), which produces at least one longitudinal cutting in the web running direction. By means of a cross cutter (cross cutter) the formats are cut to the format length. The formats thus obtained in the course and at the same time with corrugated board production are stacked at the end of production of the plant.

Conventionally, the stacks of rigid formats formed at the end of corrugated production are packaged and transported to remote manufacturing facilities. There, the formats are isolated and mostly in rotary die-cutting machines (eg US Pat. No. 3,690,199 ) or flatbed punching machines, each equipped with a special punching tool, cut at their corners. For this purpose, each flat rigid corrugated board format in the form of a single sheet usually created by means of a so-called Prefeeders for insertion and the punching are supplied. The punched, occasionally accumulating corrugated cardboard formats are then stacked again, packaged and fed to further use. The on the corrugated board by the Longitudinal cutting cuts and the cross-cut cuts produced, to be processed corrugated board formats have a frequently influenced by transport and temporary storage and impaired strength due to moisture. Special requirements exist when the corrugated cardboard material to be punched is relatively hard. In any case, the punching machines are equipped with punching tools and equipment that accomplish the punching of corrugated cardboard of very different, mostly unknown and above all fluctuating, undefined strength. This requires punching tools with relatively complex, specially machined punching contours and ancillary equipment, which counteract in particular jamming of the corrugated cardboard during punching. According to the format dimensions, the punching machines are particularly adjusted, the setting process and the setting accuracy and consequently the punching quality are affected by the fact that products to be punched in the form of blanks removed from a stack are selectively and so far given discontinuously in the punching machine. When using punch cylinders, which are operated synchronously with the conveying speed, the choice of format lengths is limited. Each format requires an associated special punching tool. It takes time and setup effort to adapt the punching machine on corrugated board formats of different dimensions and set. For the temporary, sometimes insufficiently defined material condition of the corrugated board, the use of suitable punching tools is sometimes only possible by trial and error.

One out DE 43 40 985 A1 Known device is designed for operation with a single-sided corrugated board web, so a only one-sided covered flexible wave path, which is to provide a separate semi or intermediate product in roll form. The apparatus includes a rotary die cutter having a punch roll which is stepwise rotationally controllable relative to the passage motion to form selectable length dimensions of the blanks. The punching roller is particularly designed and adapted in such a way that at the same time with one and the same tool blanks from each other and Eckausstanzungen performs. A device according to US 5 052 992 has a flat bed punch with a single punching device, which at the same time introduces punched and shear cuts in a windable web, which is to be provided as a semi-product in the form of a roll wrap and intermittently to promote. Blanks become gradual operation through shear edges of the blank size defining output apertures separated. Punching for corner punches, which are star or karoförmig must be adapted to the discharge opening.

DE 564 173 C discloses a machine for making carton blanks cut from a board web unrolled from a roll. The unrolled paperboard web requires special guidance in order to machine it with continuous movement in a linear distance. The unrolled paperboard web is clamped during its transport movement between a punching device and pinch rollers to exclude longitudinal and transverse displacements, the punching device itself punching undesired guide register holes in the form of rectangular cutouts.

The invention has for its object to simplify the production of sheet-rigid corrugated board formats with shaping edge punches. The production speed should be high, the manufacturing effort should be reduced to a minimum, the punching should be performed with high quality and the adaptation to corrugated board formats of very different dimensions should be simple.

The objectives of the invention are procedurally achieved in conjunction with the features of the aforementioned method in that in the production of corrugated cardboard drying heat, while in a production line along a web travel continuously moving corrugated web after the drying treatment while maintaining the continuous web travel movement in coordination with the at least one Longitudinal cutting cut and the cross cutting cuts are additionally punched, remove the corner material in the form of stampings and produce at least one shaped corner edge of the corrugated board formats, the Eckformschnitte which are punched in relation to the web width at least one width position in series succession, the at least one longitudinal separation section and the transverse cutting cuts, the latter in accordance with predetermined longitudinal intervals of the along the web running direction in at least one row of successive Eckformschnitte be mounted aligned.

The corner molding cuts are punched in a heated by the drying area of the corrugated cardboard web, wherein the width position is adjusted. In order to set the Eckform-punching to the desired format length and synchronize with it, at a measuring point the web length is measured, with which the corrugated web passes the measuring point, and the Eckform-punchings are carried out in series successively in accordance with repeatedly measured web length, the corresponding desired format length is given.

A particularly suitable for carrying out the method according to the invention particularly suitable corrugated board for continuously producing the corrugated web and cut to this in the course of their production with at least one straight longitudinal cutting and straight cross-cut corrugated board formats in conjunction with the characteristics of einggen gengen corrugated board is that in Bahnbewegungsrichtung behind the heating section a Eckformschnitt-punching device is arranged, which brings into the moving web of corrugated in the heated by the drying by means of the heating section die cuts that produce for shaping at least one edge of the corrugated board formats Eckformschnitte remove the corner material in the form of stampings, the control device of the corrugated paperboard Synchronization control means for synchronizing the attachment of the transverse cutting cuts and the attachment of said Eckformschnitte includes.

The Eckformschnitt-punching device comprises a over the width of the corrugated cardboard sheet extending guide means and at least one disposed thereon, at least one punch having punching unit, which is slidably guided along the corrugated cardboard web width and fixable in the desired width position with respect to the corrugated web width

With the method according to the invention and the corrugated board production plant according to the invention, a number of advantages are achieved.

The production of corrugated board formats with material-separating edge punches is integrated into the corrugated board manufacturing process. From the corrugated web, corner punching forming punching parts are punctually and precisely cut out, the Eckform-punching and cutting the cross cutting cuts of the associated separate independent processing facilities are synchronized with each other. The cut-out punched material parts leave recesses or cut-outs that determine the corner shape. Delivered from the corrugated board production, provided with desired corner shapes formats are readily available. A conventional to be connected separate production for attaching corner punches and the associated expense accounts. The punching of the corners of the format by means of the corner die cuts cut in accordance with the invention takes place in the course of corrugated board production. The environment, namely the location and condition of the corrugated board material after drying, that is to say after defined bonding without intermediate influences, is not subject to any undefined change during the application of the corner-shaped cuts, but is standardized for all punching processes. This results in advantages, in particular with regard to the production speed and the use of simple, functionally reliable and operable with great speed punching tools for Eckformschnitte. Other advantages include the fact that the format dimensions can be changed without the need for elaborate set-up measures while maintaining intended corner shapes even in ongoing production. In addition, corner shapes can be changed simply by punching tools for desired Eckformschnitte can be selected by operating conversion or replacement without special effort. Furthermore, a special utilization of the corrugated board production plant becomes possible. At the same time, different web strands can be produced by utilizing the full width of the web or machine. The web strands can in particular on different format widths, on formats with differently shaped corners and / or adapted for simultaneous production of formats with and without shaped corners. In particular, eliminates otherwise required measures for temporary storage, the special setting of punching machines and logistics between corrugated board and associated punching machines. On the whole, one achieves increased economic utilization, improvement of the production speed, reduction of production-technical expenditure, flexibility for the format and cut conversion as well as high and reliable quality of the punching. To describe the invention, a distinction is made between cutting on the one hand and punching on the other hand. Thus, the longitudinal cutting cuts and the cross-cutting cuts are made free of material punching (separation only by cutting), while on the other hand and separated by the punching material in the form of punched, cut-outs (stampings) is separated.

The Eckformschnitte can be edge punches, the outer corners and / or inner corners form as a corner edge on Format edge. Outer corner edges are produced as outer corners by aligning longitudinal cutting cuts and cross-cutting cuts produced with separate processing devices to one another in order to intersect or intersect at or in the region of the corner punching to be produced. Inner corners can be simply or repeatedly attached to at least one Formatrand determined by longitudinal cutting and / or cross cutting cut, the Eckformschnitte, the at least one longitudinal separation section and the cross cutting cuts are aligned and thus relative to each other so that the cross cutting cuts each at least one Eckformschnitt, not from a longitudinal cut is cut, cross. Instead or in addition, it is provided that the at least one longitudinal dividing section crosses corner-shaped cuts, which are attached at the predetermined longitudinal distances and are not cut by transverse cutting cuts. Inner corner producing corner form cuts form on the format edge, for example, at least one projection or cutout such that, for example, a tab, a factory edge (attachment panel) or nose is formed.

Preferably, the corner pieces which cut out the pieces of material are punched before the at least one longitudinal cutting cut and the transverse cutting cuts are carried out. Suitably, at least one Eckformschnitt-punching device as the first processing direction behind the heating section and preferably arranged as the only between this and the subsequent, independent longitudinal cutting device. In this area, the continuous corrugated board web is still completely unprocessed and unaffected. The punches are placed in completely closed track surface. In the course of the drying treatment following running distance, namely in the area behind the heating section, the continuously running corrugated board web still has considerable heat. It has been found that the punching of the corner molding cuts in this heat range, with, for example, a common temperature of about 60 ° to 80 ° C is generally particularly advantageous. In the heat area and a corresponding location area, the corrugated board web is already dried, in particular, a defined / stabilized residual moisture is present. The running corrugated web has there a uniform defined consistency.

Advantageously, four corner-shaped cuts can be punched with one and the same corner punching forming a stamped part (material part), forming corner edges of four adjoining corrugated board formats as outside corners. For this purpose, a four-cutting punching tool may be provided, which is associated with a longitudinal cutting section of the longitudinal cutting device, which divides the corrugated cardboard web in the longitudinal direction into adjacent web strands which are each separable into corrugated board formats by means of transverse cutting sections of the cross cutting device. In particular, in combination with the Eckform-punching for four Eckformschnitte a stamping part forming Eckformstanzung can be performed, which forms two corner edges of adjacent corrugated board formats as outer corners. The corrugating machine is then set up with a two-punch die punching only two corner cuts of adjacent corrugated board formats.

Although a longitudinally undivided corrugated board web can also be processed for the production of the format with Eckformschnitten, it is particularly advantageous and economical that at least two web strands can be provided with Eckformschnitten. It is expedient to insert at least three punching cuts producing the corner-molding cuts in a punching transverse line which extends parallel to the direction of the format-separating cross-cutting cuts, whereby at least two web strands are formed, each in successive corrugated board formats be separated. The Eckformschnitt-punching device then expediently has at least three punches, which are for punching the Eckformschnitte in one of the three tools common, associated cross-cutting cuts corresponding punching line.

A preferred method measure is that the corrugated cardboard web is moved at least substantially at a constant web speed. Advantageously, the web length measurement is carried out in the area in front of the Eckformschnitt-punching device, wherein it is further advantageously provided in a length range of about 0.5 to 3 format lengths before a punching line of Eckformschnitt-punching device.

When operating with special measures to keep the web speed constant, the corner punching punches for operation control can additionally be controlled in accordance with set time intervals, which then correspond to the spacing of the corner shaped cuts along the corrugated cardboard web. Optionally, the setting of time intervals for synchronizing the cross cutting cuts can be used with the Eckform-punchings.

A preferred method measure is that along the web running direction successive Eckformschnitte be used as registration marks for controlling the format lengths determining cross-cutting cuts. The registration mark control can advantageously also be carried out in combination with the web length / web measurement and / or with the timing for synchronizing the corner mold cuts and the cross cutting cuts. One achieves in combination a desired and actual control, which particularly favors the spot or line attachment of the cross cutting cuts, especially when the path length between the Eckform punching and the cutting of the cross-cutting line is considerable, namely, for example, at least five format lengths and more, wherein the longitudinal cutting device is arranged in this area or the at least one longitudinal section is carried out in this area. The registration marks are detected with a suitable sensor which is connected to the control device, wherein the registration mark detection advantageously takes place in the region in front of the cross-cutting device, e.g. B. in the path range of 0.5 to 3 format lengths. The registration mark control is part of the synchronization control means.

Depending on the shape of the Eckform-punching, but also in general, a particularly advantageous measure is that each Eckform-punching is performed over a running in the web direction punching section such that the punching takes place in the web running direction with a speed corresponding to the web speed component.

A control measure may be that with the adjustment of the position of the Eckformschnitts along the web width, the adjustment of the associated width position of the format width determining longitudinal separation section is controlled. Conveniently, the corrugating machine is then set up such that the synchronization control means comprises a longitudinal cut control which controls the slitter for associated attachment of a longitudinal cut in accordance with the width position of web mold successive corner die cuts set in relation to web width.

Advantageously, at least one Eckformschnitt-punching device in an area free of cutting devices between the second plant section and preferably the longitudinal cutting device, or even the cross-cutting device, be arranged with punches or sections are provided in regions corresponding to each other separately.

,

With the guide device on which at least one punching unit is arranged, one achieves a modular design. This means that the or each punching unit and the arrangement of punching units can be assembled and set up according to the desired application design with modular elements. The punching units can be equipped with individual punching tools and associated with each separate punch drive. With subdivision and division of the punching device in the modular units to be moved body or masses of the punching device are reduced during punching. As a result, operation with large punching speeds is enabled.

An embodiment of the punching unit or each punching unit is that it comprises at least one punching tool which is arranged on an associated, forming part of the punching unit rotational body which is rotatable about a tool axis of rotation which extends parallel to a punching transverse line, which corresponds to the direction of the associated cross-cutting cuts.

Tools and drives form components that can be individually assembled and set up to meet the requirements of a product order. Both in modular design, as well as in general all Eckform punching can be executed or set up with the same Eckformschnitten.

The at least one punching unit or each punching unit can expediently be set up with a rotary drive which rotates the tool-rotating body about the tool rotation axis. In a preferred embodiment, the control means of the corrugating machine comprises a rotary drive controller which controls the rotation drive of the tool rotation body such that the rotational speed of the punch during the punching process corresponds to the corrugated web speed, and comprises adjustment means by which the rotational speed at which the Punching tool is moved outside the punching process, to adjust to or for adjusting the format length changeable and adjustable. A peripheral speed of the punch, which is greater than the web speed, belongs to a format length which is smaller than the circulation path of the punch, while vice versa to a format length arbitrarily larger than the tool circulation path, a peripheral speed smaller than the web speed is heard. The setting may also be such that the peripheral speed corresponds to the web speed. The circumferential path of the punching tool then corresponds to the format length. The control of punching tools may be such that they come to a standstill between punch cuts. The aforementioned peripheral speeds are then to be understood as average speeds.

In the above-mentioned and still other advantageous and advantageous embodiments of the invention, subclaims are directed. Features of the embodiments contribute in any combination to the essential solution according to the invention, so that it is not limited to a specific embodiment described, but also every significant individual measure of a specific embodiment is independent of protection based. Each sub-feature of an embodiment is to be understood as a sub-feature of further embodiments not shown. Ledigleich particularly expedient and advantageous embodiments and possibilities of the invention will be described with reference to the following description of the embodiments illustrated in the schematic drawing.

Fig. 1

in Längsansicht eine erfindungsgemäße Wellpappeerzeugungsanlage,

Fig. 2

in vergrößerter Darstellung einen Bereich, in dem eine Eckformschnitt-Stanzeinrichtung und eine Längsschneideinrichtung angeordnet sind,

Fig. 3

in vergrößerter Darstellung in Ansicht schräg von oben die Eckformschnitt-Stanzeinrichtung sowie die Längsschneideinrichtung,

Fig. 4

in vergrößerter Darstellung eine Ansicht der EckformschnittStanzeinrichtung an ihrer Auslaufseite und

Fig. 5

in vergrößerter Darstellung die Längsschneideinrichtung an ihrer Auslaufseite.

Show it

Fig. 1

in longitudinal view of a corrugated board production plant according to the invention,

Fig. 2

in an enlarged view, a region in which a corner shape cutting punching device and a longitudinal cutting device are arranged,

Fig. 3

in an enlarged view in view obliquely from above the Eckformschnitt-punching device and the longitudinal cutting device,

Fig. 4

in an enlarged view a view of the EckformschnittStanzeinrichtung at its outlet side and

Fig. 5

in an enlarged view the slitter on its outlet side.

Fig. 1 to 5 show a corrugated cardboard production plant 1 according to the invention, in which a corrugated board web 2 extends along the corrugated board production plant 1 in a production line. For ease of illustration, machine frames or racks are not shown, and also components of bearings that are disposed on the viewer facing the longitudinal side of the system are cut away.

Along the production line, the corrugated board production plant comprises a first plant section 100, in which the actual corrugated board production is carried out, a second plant section 101, which forms a heating and drawing section, and a third plant section 102, which is equipped with independent, separate processing devices, namely the second Plant section 101 below, first with a Eckformschnitt-punching device 6 according to the invention, then with a longitudinal cutting device 4 and subsequently at the end of the production line with a cross-cutting device 5. The longitudinal cutting device 4 and the cross-cutting device 5 are known per se as such, as far as the corrugated cardboard web 2 with straight , cut at right angles intersecting cutting lines, without punching material, to obtain corrugated board formats 3 from a non-windable corrugated board web. The corrugated board formats 3 are stacked in a stacking device 15 at the end of the production line.

The corrugating machine 1 further comprises a control device 7, which controls the entire operation of the corrugated board 1. Specifically, as shown schematically, a driving and conveying device 12 constituting the section 101, the corner-cutting cutting device 6, the slitting device 4, and the cross-cutting device 5 are controlled to coordinate the operation of these devices. This control may also include feedback from the controlled devices, as shown by double arrows of control lines between the controller 7 and said devices. The control device 7 and its controls, control sections or control means, which are still related be explained are formed by today's usual electronic and / or mechanical devices. In particular, a processor-equipped computer, operated with appropriate programs and tuned to the products to be produced, monitors and controls the entire corrugator. Such controls, which are known as such, are not the subject of the present invention, so they are not described in detail.

The first plant sections 100 is shown only in the form of a dash-dotted rectangle. These are the usual aggregates of a corrugated board production plant. There, at least one paper web is corrugated by first, in order to give it the required elasticity, first heated and moistened and then passed under pressure and heat action between tooth-like intermeshing corrugating rolls. The corrugation of the rollers determines the wave shape and thus the wave types, which are defined according to wave height and width. The corrugated paper is provided at its shaft tips with glue and glued with a smooth cover sheet of paper. Single-walled corrugated board is produced by adhering a second cover sheet to the other side of the shaft. Depending on requirements, further corrugated and / or smooth paper webs can be added to produce multi-corrugated, in particular two and three-wave corrugated cardboard. After the said process, the single- or multi-corrugated corrugated board web 2 succeeded in the second plant section 101. The corrugated board web 2 is dried in the heating and drawing section of this section. The known heating section 11 is shown only with circulating wipes, between which the corrugated cardboard web 2 is conveyed through. The pulling section comprises the drive / conveying device 12, which is equipped with traction rollers 121 which are driven by a rotary drive 120 shown in phantom and which convey the corrugated cardboard web 2 between them. This drive / conveyor 12 forms the main drive for moving the corrugated cardboard web 2 along the production line on a parallel with a machine longitudinal axis 103 web travel path 20 which is formed and determined by lying in a horizontal plane track tables 14.

The production of the corrugated cardboard web 2 in the first plant section 100 can, regardless of the basic measures described above, take place in any desired manner, and also the heating and pulling section can be designed in a variety of ways. According to the invention, it depends on the arrangement or operation of the Eckformschnitt-punching device 6, which is provided in the production line downstream of the second plant section 101 between this and the arranged at the output of the production line cross-cutting device 5.

The longitudinal cutting device 4 comprises a downstream station 401 in the web running direction 200, which as a whole is equipped with three circular cutting blades 44. In the exemplary embodiment, a rotating, a center blade 442 forming circle cutting blade 44 of the longitudinal cutting device 4 is set and operated so that the continuously moving from the drive / conveyor 12 along the web travel path 20 in the web direction 200 corrugated web 2 centered in two identical web strands 201, 202 is disconnected. Outer or edge knives 441 are arranged and arranged at the same transverse distance from the center knife 442 such that they cut off from the free longitudinal edges of the web strands 201, 202 each have a cut portion 65 in the form of a marginal strip, as in particular Fig. 2 and 5 is apparent. The center knife 442 produces a web-parallel longitudinal cutting section 42 in a straight line, and the edge knives 441 produce longitudinal longitudinal cutting cuts 41 parallel to the edge of the corrugated cardboard web in a straight line.

In the exemplary embodiment, the knives 44 of the station 401 are rotatable by means of a drive shaft about a common axis of rotation 40 perpendicular to the machine longitudinal axis 103. The rotary drive takes place by means of a in Fig. 1 In the exemplary embodiment, each cutting blade 44 is mounted on an associated slide 46. Each carriage 46 is suspended on a guide 45, which is formed for example by a rail guide shown with two parallel, perpendicular to the machine axis 103 rods. At these rods, the carriage 46 are slidably guided and held in position adjustable.

The figures show another station 402 of the slitter 4 above station 401. This station is formed in correspondence with station 401 and is shown with offset disk-shaped circular cutting blades. The stations 401, 402 may be operated alternately or simultaneously. They can with the same, unrotated in the direction of rotation axis cutting blades or, like shown, equipped with offset cutting blades and operated. Positions can be preset, so that it may not be necessary to move and / or adjust the distances in the stations.

The cross-cutting device 5 is equipped with a pair of knife rollers 54, 55, between which the corrugated cardboard web 2 is driven through and thereby provided with transverse to the machine longitudinal axis 103 and to the web edges cross cutting 51, which are cut in a straight line. The knife rollers 54, 55 are rotated in opposite directions by means of a drive 51 shown only in phantom. The cross cutter 5 may be formed in any other suitable manner for making straight cross cuts 51.

The third plant section 102 may include additional per se known cutters, namely, for example, a short cross cutter 16 that may be set up and operated to cut flaws from the corrugated web during production.

According to the invention, the corner-cut cutting device 6 in conjunction with the longitudinal cutting device 4 and the cross-cutting device 5 is of essential importance. For this purpose, the longitudinal cutting device 4 with arrangement, device and operation of their cutting blade 44 is adapted to the Eckformschnitt-punching device 6. Also, as will also be explained below, 5 special means for common, synchronous operation of the Eckformschnitt-punching device 6 and the cross-cutting device 5 are provided and used.

The corner shape-cutting punching device 6 according to the invention is arranged in the region between the second plant section 101 and the longitudinal cutting device 4, namely at a greater distance from the output or the draw rolls 121 than from the longitudinal cutting device 4. The corrugated cardboard web 2 remains after leaving the second plant section 101 to about two-thirds of the railway line between the second plant section 101 and the longitudinal cutting device 4 of a processing free. The then taking place before the slitting and cross cutting processing is done by the Eckformschnitt-punching 6th

The Eckformschnitt-punching device 6 comprises three punching units 610, 620, which are arranged above the Laufweg- or the corrugated cardboard web width with equal transverse distances. Each web edge is associated with a punching unit 610, while in the middle region of the corrugated cardboard web 2, the third punching unit 620 is arranged. The punching units 610, 620 are basically the same. Each punching unit 610, 620 comprises a rotatable circular disk-shaped rotary body 9, a rotary drive 91 and a slide 92 which supports and holds the rotary body 9 and the rotary drive 91. Each rotary drive 91 may be formed by, for example, a controlled servomotor and a servo gear. The three rotary bodies 9 are all arranged rotatably about one and the same tool rotation axis 90. The tool rotation axis 90 extends parallel to a punching transverse line 60 which corresponds to the directional course of associated transverse cutting cuts 51, that is to say being aligned parallel to the cutting line of the transverse cutting device 5 which produces them.

In the exemplary embodiment, each carriage 92 is suspended on a guide device 8, which is formed by two parallel rods perpendicular to the machine longitudinal axis 103, which extend across the width of the web travel path parallel to the punching cross-60 and fixed end to a frame, bearing walls or frames are. The slides 92 are slidable along the rods in their transverse position, adjustable and fixable. Special means for setting and setting are not shown. Such remedies can be varied. It can be provided adjusting / locking means that are operated only by hand, or those that are mechanically operated. Suitably, the web width is associated with a scale, not shown, which serves as a distance / distance scale for adjusting the position of each punching unit over the web width. Carriage and / or guide device can also be designed very different. It is essential that the or each punching unit can be adapted to the positions of the Eckformschnitte.

The rotary body 9 of the center station 620 is provided at its periphery with a four-cutting punch 602. This tool punches after each full revolution of the rotary body 9 a star or karoförmige punching in the corrugated cardboard web 2, so that a correspondingly shaped punched-out material part, namely a Stamped part 63 is created ( Fig. 4 ). In the exemplary embodiment, the punching tool 602 has four point-shaped cutting edges (points) corresponding to the star shape and connecting, outwardly concave cutting sections. Correspondingly, four outer corners forming corner punching cuts 62 are punched, with two opposite transverse cutting tips of the punching tool 602 corresponding to the punching transverse line 60 and thus aligned parallel to the later cross cutting 51, while the other two longitudinal cutting tips in the punching transverse line 60 perpendicular direction corresponding to the longitudinal cutting section 42 are aligned.

The rotary bodies 9 of the outer punching units 610 have the same diameter as the rotary body 9 of the punching unit 620. Instead of the four-cutting punching tool, a two-cutting punching tool 601 is formed, which corresponds in half to the four-cutting punching tool 602, so that it has a wing-like shape with converging in a cross-cutting tip punching / cutting edges which, facing away from the edge of the corrugated cardboard web 2, are concave , As a result, the two-cutting punching dies 601 with each punching punch two corner-shaped cuts 61 which correspond to two corner-shaped cuts 62 and form between them a stamped part 64 in the form of a star half of the stamped part 63 ( Fig. 3 ).

In the exemplary embodiment, the punching device 6 is equipped with a counter roller 600 extending over the width of the table. The punching tools 601, 602 work against a smooth-surfaced, possibly raised, counter-pressure force adjusted and tuned roller peripheral portion 603. Accordingly, an unillustrated rotary drive is provided which rotates the counter roller 600 in synchronism with a corresponding peripheral speed or the tool speed. Another embodiment, not shown, is that instead of the uniform mating roll, an arrangement is provided which is modularly divided into the punching tools 601, 602 and the punching units 610, 620 associated countermeasure body, each Gegenanlagekörper synchronously with the associated punching tool and optionally rotatable is arranged.

It can be seen that the corner-shaped cuts 61, 62 are all the same, namely in the exemplary embodiment the same round, convex-shaped corner edges of corrugated cardboard formats 3 manufacture, wherein the corrugated board formats are cut only after the attachment of the Eckformschnitte 61, 62 with the longitudinal cutting device 4 and the transverse cutting device 5. The longitudinal cutting device 4, the transverse cutting device 5 and the corner shape cutting punching device 6 are set and operated such that the longitudinal cutting tips of the tools 601, 602 are aligned with the longitudinal cutting sections 41 and the longitudinal cutting section 42, while the transverse cutting tips of the punching tools 601, 602 with the transverse cutting sections 51 are aligned.

The disc-shaped rotary body 9 forms with the punching tool disposed thereon a mass-reduced component which can be operated at a relatively high speed, wherein acceleration (starting) and deceleration (braking) can be carried out satisfactorily. For example, the corrugator may operate at 200 feet per minute and more.

The modular construction is with particular advantage preferably also such that the punching dies, namely the punching tools 601, 602 can be mounted interchangeably on the rotating bodies 9. For example, the punching tools 601, 602 may be formed by tool rings or rings, not shown, which form a rotary body together with a core body as a shell body. For example, punches equipped with at least one punch may be interchangeably bolted to the core body. The punching form can be chosen arbitrarily. Instead of the described circular punching tools 601, 602 punching tools can be provided, for example, with rectangular, circular, diamond-shaped and / or trapezoidal cutting.

Using the described corrugated board production plant 1 according to the invention, the process according to the invention for the continuous production of the corrugated cardboard web 2 and the corrugated board formats 3 cut to it in the course of their production is carried out in that in the continuously moving corrugated board web 2 after drying treatment while maintaining the continuous web travel movement in coordination with the longitudinal cutting cuts 41, 42, the corner molding cuts 61, 62 are punched, in addition to the straight longitudinal cutting sections 41, 42 and the straight transverse cutting cuts 51. The coordination of the cuts For example, be done by first the positions of the Eckformschnitte 61, 62 are set along the web width and with this setting the adjustment of the associated width position of the format width determining longitudinal separation section is brought into line. This setting can be controlled automatically by means of the control device 7.

The control device 7 controls and synchronizes the movement sequences over all devices. The control device 7 also includes its associated, associated with the operation of the system control means.

In the exemplary embodiment, the control device 7 comprises a synchronization control means 764, which detects the positions of the rotary bodies 9 and the punching tools 601, 602 and controls, for example, electromechanical drive and adjustment means for positioning the cutting blades 44, not shown. Similarly, it is conceivable that the positions of the cutting blade 44 are adjusted and the tool rotation body 9 are positioned by means of appropriate control and adjusting means.

A drive controller 71 and control means 761 ensure that the rotary drive 120 of the drive / conveyor 12 is optimally operated in coordination with the operation of the first system section 100. The rotary drive 120 is set to continuous and expedient in particular at least substantially constant operation. The Eckform-punching are carried out at defined local and / or time intervals, so that the Eckformschnitte 61, 62 are produced in rows in the embodiment with a uniform format length. In the exemplary embodiment, the tool rotational drives 91 of the Eckformschnitt-punching device 6 are uniformly and consistently controlled by means of a drive means 910 and an associated punching control 76 of the control device 7. The control is such that the punching tools 601, 602 are operated at the same time and place. Each Eckform-punching is carried out over a running in the web direction 200 punching section SA such that the punching in the web direction 200 is carried out with a speed component corresponding to the web speed ( Fig. 3 ). That is, in the phase of the punching section SA, the peripheral speed of the rotary bodies 9 and the punching tools 601, 602, respectively, synchronize with the web speed becomes. For this purpose, the control device 7 comprises a rotation drive control 716 connected between the drive control 71 and the punch control 76.

The punching control 76 also includes adjusting means for adjusting the rotational speed of the tool rotating bodies 9 in relation to the web speed between successive corner punching cuts. A peripheral speed of the rotary body 9 or the punching tools 601, 602, which is greater than the web speed, results in a format length which is smaller than the circumference of the punching tool. Incidentally, format lengths equal to or larger than the tool revolution path can be set.

In the exemplary embodiment, the punching control 76 is provided with a only in Fig. 1 shown length measuring device 77 connected. The length measuring device 77 is advantageously arranged between the plant section 101 and the corner-cut cutting device 6 free of other stations or devices between the device 6, 77 and the section 101. The length measuring device 77 forms a, for example, the top of the corrugated board 2 associated measuring point for measuring length, ie distance, with which the moving web 2 passes the measuring point. The measuring length used for control is determined according to the desired format length. Each time the length measurement detects the passage of the corrugated board web having the predetermined length, the corner punch cutting device 6 performs the punching due to control by the punching control 76. The length measuring device 77 may be formed, for example, by an impeller engaging with the corrugated cardboard web 2 and traveling with it, the running angle of which is detected by the punching control 76. Any other, in particular optical length measurement can be provided.

Furthermore, in the exemplary embodiment, the control device 7 comprises a synchronization control means 75 for cross-cutting control, which is connected to a registration mark control. This has a registration mark sensor 781, which is arranged in the production line in the example behind the longitudinal cutting device 4 in the area in front of the cross-cutting device 5. The registration mark sensor 781 detects at one Web edge, the occurrence of the series in succession Eckformschnitte 61, where it can be set, for example, to recognize the Eckformschnitten 61 common cross-cutting tip. The synchronizing control means 75 controls the cutting drive 53 of the cross-cutting device 5 so that it performs each cross-cutting section 51 precisely with the cross-cutting tips of each successive Eckformschnitte 61, 62 in passing them.

The timing of the cross-cutting cuts 51 takes place in correlation and synchronism with the continuous movement of the corrugated cardboard web 2 as a function of their speed. Accordingly, the stacking device 15 is operated for stacking cut-off formats 3. The drives 91 of the tool rotation body 9 and the rotary drive 43 of the longitudinal cutting device 4 are controlled by means of the control device 7 in coordination with each other.

For controlling the cross cutting cuts 51, in the embodiment in combination with the register mark control, synchronicity with the operation in the corner shape cutting punch 6 is produced by the predetermined length measured successively with the length measuring means 77 both the corner shape cutting punch 6 and the cross cutter 5 via the synchronization control means 75. The control device 7 can also, as in Fig. 1 shown, a Synchronisierungssteuermittel 765 include, which then used at constant controlled web speed spacings, which are set to execute the Eckform-punchings, for controlling the cross cutting cuts 51. The described track length measurement control, which is unaffected by changes or irregularities in web speed, is preferred.

The marginal longitudinal parting cuts 41 are aligned with the longitudinal cutting tips of the Eckformschnitte 61. As in particular from Fig. 5 can be seen by this cut the punched part 64 ( Fig. 3 ), and this and a separated by the longitudinal cutting section 41 strip-cut part 65 are collected in a collecting container 131.

As in Fig. 4 The containers 131 and the container 132 are part of a collection and suction device 13. This comprises not shown suction means which suck the punched and cut parts for receiving in the containers , Any other suitable design is possible. For example, a conveyor belt may be provided which receives the stamped parts and in particular transports them to a central exhaust.

In the exemplary embodiment, the corrugated cardboard web 2 is cut into the two same web strands 201, 202 and with equal transverse distances, the three, the circular Eckformschnitte 61, 62 produced as outer corners punching introduced. In particular, with the described modular construction of the Eckformschnitt-punching device other benefits can be driven on the corrugated board, for example, on a 250 cm wide system with other format widths and possibly additionally installed punching units. The longitudinal cutting device 4 can be equipped with any other number of cutting blades, even with only one cutting blade or optionally operated by selective control. Accordingly, the one or more punching tools of the Eckformschnitt-punching device 6 are established. As a result, the system can be operated with undivided corrugated web or multiple web strands with, as in the embodiment, the same width or different widths. The Eckformschnitt-punching device 6 can also be arranged downstream of the longitudinal cutting device 4. An arrangement between the stations 401, 402 is conceivable. The arrangement described in the area behind the second plant section 101 is given preference. It is also preferred that the length measuring device 77 is arranged in the region in front of the Eckform-punching device 6 without intermediate arrangement of other processing stations.

Instead of or in addition to the outer corners, inner corners can be punched out at the longitudinal edges and / or the transverse edges of the formats. At least one associated punching device is then arranged and controlled so that, in the embodiment, at least one of the three longitudinal cutting cuts the corner corners forming the inner corners, which are not cut by the transverse cutting cuts. Additionally or alternatively, at least one punching device may be arranged and be controlled, that in the embodiment, the transverse cutting cuts Eckformschnitte that form on the transverse edges of the formats of the at least one format strand inside corners, wherein such Eckformschnitte are not cut by the longitudinal cutting sections. All punches for the inner corners are synchronous with the corrugated web track and in accordance with the length of the formats.

Claims (21)

1. Method for continuous production of a surface-rigid corrugated cardboard web (2) and of corrugated cardboard formats (3) cut therefrom during its production with at least one straight longitudinal separating cut (41, 42) parallel to the web and straight transverse separating cuts (51) oriented transversely thereto, wherein the corrugated cardboard web (2) with one or more corrugations is produced with at least one corrugated paper web covered on both sides with smooth paper web, dried during its production and, following drying while retaining continuous web advance, is provided with the at least one longitudinal separating cut (41, 42) and the transverse separating cuts (51) according to the predefined format width (B) and format length (L) respectively, characterized in that in the corrugated cardboard web (2) exposed to drying heat for producing the corrugated cardboard and moved continuously in a production line along a web advance path (20), after the drying treatment while retaining the continuous web advance movement, in coordination with the at least one longitudinal separating cut (41, 42) and the transverse separating cuts (51), corner form cuts (61, 62) are also punched which remove the corner material in the form of punched parts (63, 64) and create at least one formed corner edge of the corrugated board formats (3), wherein the corner form cuts (61, 62) are punched successively in a line relative to the web width in at least one width position, in a region of the corrugated cardboard web (2) which is heated by drying, wherein the width position of the corner form cuts (61, 62) is set along the web width, the web length with which the corrugated cardboard web (2) passes a measurement point is measured at the measurement point, and the corner form punchings are made successively according to repeatedly measured web lengths which are predefined corresponding to the desired format length (L) of the corrugated cardboard formats (3), and wherein the at least one longitudinal separating cut (41, 42) and the transverse separating cuts (51) are performed aligned to each other, the latter in accordance with predefined length spacings of the corner format cuts (61, 62) made successively in at least one line along the web advance direction.
2. Method according to claim 1, characterized in that the corner form cuts (61, 62) are punched before the at least one longitudinal separating cut (41, 42) and the transverse cuts (51) are made.
3. Method according to claim 1 or 2, characterized in that only the corner form cuts (61, 62) are punched in the region heated by the drying, and the longitudinal separating cuts (41, 42) and the transverse separating cuts (51) are made afterwards.
4. Method according to any of claims 1 to 3, characterized in that four corner form cuts (62) are punched with one and the same corner form punching, forming a punched part (63), and as outer corners form the corner edges (32) of four adjacent corrugated cardboard formats (3).
5. Method according to any of claims 1 to 4, characterized in that two corner form cuts (61) are made with one and the same corner form punching, forming a punched part (64), and as outer corners form two corner edges of adjacent corrugated cardboard formats (3).
6. Method according to any of claims 1 to 5, characterized in that at least three punchings are made, creating the corner form cuts (61, 62), with transverse spacing in a punching transverse line (60) extending parallel to the direction of the transverse separating cuts (51) which determine the format lengths (L), wherein at least two web strands (201, 202) are formed which are each separated into successive corrugated cardboard formats (3).
7. Method according to any of claims 1 to 6, characterized in that corner form cuts are punched which form inner corners on at least one edge of the corrugated cardboard format, wherein the corner form cuts are each cut only from a longitudinal separating cut or a transverse separating cut.
8. Method according to any of claims 1 to 7, characterized in that temporal and/or spatial intervals corresponding to the predefined format length (L) are used to control the performance of both the corner form punchings and the transverse separating cuts (51).
9. Method according to any of claims 1 to 8, characterized in that the web length measurement is carried out locally in front of the application point of the corner form punchings, wherein the web advance path remains free from processing between this application point and the measurement point.
10. Method according to any of claims 1 to 9, characterized in that corner form cuts (61) lying successively in a line along the web advance direction (200) are used as crop marks (780) for controlled performance of the transverse separating cuts (51) creating the format lengths.
11. Method according to any of claims 1 to 10, characterized in that by setting the width position of the corner form cuts (61, 62) along the web width, the setting of the associated width position of the longitudinal separating cut (42) determining the format width (B) is controlled.
12. Corrugated cardboard production plant (1) for continuous production of a corrugated cardboard web (2) and of corrugated cardboard formats (3) cut therefrom during its production with at least one longitudinal separating cut (41, 42) and transverse separating cuts (51), comprising a first plant portion (100) joining together a corrugated cardboard web (2) with one or more corrugations from a plurality of papers in that at least one paper web is corrugated and glued to at least two smooth paper webs, a second plant portion (101) downstream in the production line and formed at least by a heating part (11) which outputs the dried corrugated cardboard web (2) moving along a web advance path (20) with web speed in the production line, a further third plant portion (102) downstream in the production line and formed by a longitudinal cutting device (4) and a transverse cutting device (5) for cutting the corrugated cardboard formats (3) with at least one straight longitudinal separating cut (41) determining a predefined format width (B) and straight transverse separating cuts (51) determining the predefined format length (L), a drive and conveyor device (12) for continuous web movement of the corrugated cardboard web (2) leaving the dry end of the heating part (11) in synchronisation with the corrugated cardboard production in the first plant portion (100), and a control device (7) of the corrugated cardboard production plant (1) comprising a device (75) for controlling the transverse cutting device (5) in correlation with the corrugated cardboard web speed, characterized in that the corrugated cardboard production plant (1) is configured for performance of the method according to any of claims 1 to 11, in that at least one corner form cut punch device (6) is arranged after the second plant portion (101) in the web movement direction (200) and performs punchings in the moving corrugated cardboard web (2) in the area heated by the drying by means of the heating part (11), which punchings, for forming at least one edge of the corrugated cardboard formats (3), create corner form cuts (61, 62) which remove corner material in the form of punched parts (63, 64), wherein the corner form cut punching device (6) comprises a guide device (8) extending over the width of the corrugated cardboard web (2) and at least one punching unit (610, 620) which has a punching tool (601, 602) and is guided movably along the corrugated cardboard web width and can be fixed in the desired width position relative to the corrugated cardboard web width, and in that the control device (7) of the corrugated cardboard production plant (1) comprises synchronisation control means (75, 76) for synchronising the performance of the transverse separating cuts (51) with the performance of said corner form cuts (61, 62), wherein a length measurement device (77) is arranged which forms a measuring point for measuring the web lengths of the corrugated cardboard web (2) passing by, wherein the length measurement device (77) is connected to the corner form cut punching device (6) via the control device (7).
13. Corrugated cardboard production plant according to claim 12, characterized in that the corner form cut punching device (6) is arranged between the second plant portion (101) and the longitudinal cutting device (4).
14. Corrugated cardboard production plant according to claim 12 or 13, characterized in that the corner form cut punch device (6) has at least one four-cut punching tool (602) which is assigned to a longitudinal separating cut (41) of the longitudinal cutting device (4) dividing the corrugated cardboard web (2) in the longitudinal direction into adjacent web strands (201, 202) which can each be separated into corrugated cardboard formats (3) by means of transverse separating cuts (51) of the transverse cutting device (5), wherein the four-cut punching tool (602) punches out punched parts (63) which form corner form cuts (62) on four adjacent corrugated cardboard formats (3).
15. Corrugated cardboard production plant according to any of claims 12 to 14, characterized in that the corner form cut punch device (6) has at least one two-cut punching tool (601) which, forming a punched part (64) in each case, punches two corner form cuts (61) of adjacent corrugated cardboard formats (3).
16. Corrugated cardboard production plant according to any of claims 12 to 15, characterized in that the corner form cut punch device (6) has at least two punching tools (601, 602) which, for punching the corner form cuts (61, 62), lie in a punching transverse line (60) corresponding to transverse separating cuts (51) assigned in common to the two punching tools (601, 602).
17. Corrugated cardboard production plant according to any of claims 12 to 16, characterized in that the corner form cut punch device (6) comprises at least one punching unit (610, 620) having at least one punching tool (601, 602), wherein the at least one punching tool (601, 602) is arranged on an associated rotation body (9) which forms part of the punching unit (610, 620) and is rotatable about a tool rotation axis (90) which extends parallel to a punching transverse line (60) corresponding to the direction of the associated transverse separating cuts (51).
18. Corrugated cardboard production plant according to claim 17, characterized in that the punching unit (610, 620) comprises a rotation drive (91) which rotates the tool rotation body (9) about the tool rotation axis (90).
19. Corrugated cardboard production plant according to any of claims 12 to 18, characterized in that the length measurement device (77) is arranged between the second plant portion (101) and the corner form cut punch device (6).
20. Corrugated cardboard production plant according to any of claims 12 to 19, characterized in that the synchronisation control means (75) comprise a crop mark controller which responds to corner form cuts (61), punched successively in a line in the web course, as crop marks (780) and controls the transverse cutting device (5) to produce the transverse separating cuts (51).
21. Corrugated cardboard production plant according to any of claims 12 to 20, characterized in that the control device (7) comprises synchronisation control means (764) which are connected to the longitudinal cutting device (4) for control thereof according to the width position, set relative to the web width, of corner form cuts (61, 62) arranged successively in a line in the web course.

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