CH703270B1 - Production line for paper and cardboard. - Google Patents

Abstract

The invention relates to a production line (10) for paper, cardboard and corrugated base paper, comprising: a. A wet part (11) having a plurality of vacuum suction trays (12-19) or long sieves or discharges thereof; b. At least one calibration press (30); c. A hot-air dryer (31); (32) and / or cooling leaks (33) arranged one above the other. (DE). WIPO Home services World Intellectual Property Organization

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a production line for paper, cardboard and corrugated base paper, comprising: a) a wet section having a plurality of, in particular troughless, suction pads or elongations or discharges thereof; B) at least one, preferably two, calibration presses; (C) a hot-air dryer; D) a storage path.

[0002] There are three industrial processes for the dewatering of paper, cardboard, cardboard and pulp, namely the wire, the wire screen and a combination of the two. In the case of a fourdrinier, a fibrous material suspension is applied to a circulating screen through a hydrostatic or pressurizer and is thereby dehydrated.

[0003] In the round sieve, a fiber suspension is pumped into a bed, where it is scooped by a circulating sieve stream and transferred to a surrounding upper cloth, for example a wool felt, and transported further to the next round sieve.

[0004] The term "former derivation" is used to express the fact that all today's so-called "former" are derived from four-wire or round-wire screens.

[0005] It is an object of the present invention to provide a production line which is suitable both for cartonboard and corrugated base paper, but which can also be used in pulp dewatering machines and for paper production, and whose space requirement is kept low. In addition, the production line should be operated without any incidents, but at the same time at high speed.

[0006] This object is achieved by a production line of the type mentioned in the introduction, wherein the hot-air dryer is designed as a hot-air levitation dryer system. Preferably, the hot air dryer is designed with three horizontal passages "back-to-back" for temperatures up to about 350 ° C. The hot air dryer system can be fueled by means of liquefied natural gas or natural gas, whereby firing with liquid gas is preferred since this is more favorable. Hot-air float dryers have so far only been used for special areas. Their use in the paper industry has hitherto been practiced only in part behind strings in separate coating machines. On the contrary, surface contact drying by means of heated dry cylinders made of cast iron has hitherto been used. Conventional surface contact dryers in the Fallevon carton machines often have up to 130 gritty dry cylinders with diameters up to 1.5 m. This means a considerable expense for such a drying installation. According to the invention, on the other hand, an industrial air dryer system is provided, which can be implemented at a considerably lower cost. The hot air dryer system according to the invention furthermore has the advantage that a lot of space and space in the longitudinal direction of the production line is saved, with corresponding savings in foundation, building and sub-cellar costs. A boiler house for steam production can also be saved. In addition, the primary investment costs are far lower than for steam-heated dry cylinders, Which in the past were up to 80% of the total board machine. On the other hand, a hot air dryer is only about 25% of the primary investment costs.

[0007] Savings can also be made weight-wise. A hot air dryer system accounts for about 30% of the total weight of the entire system. In terms of drive technology, only about 5%, instead of 80% of a total system, have to be driven (except for the drives of the circulating air fans). Thus, the energy consumption can also be significantly reduced. The multi-storey version has the advantage that the space requirement is significantly lower. Thus, foundation costs can also be saved.

[0008] Furthermore, the provision of a hot-air levitation dryer system has the advantage that, for example, deflection rollers can be easily converted from fixed to floor by fixed points. Edge control devices can be accommodated between the individual floating dryer housings. Floor deflection rollers can be surrounded by Plexiglas enclosures and integrated into the heating system.

[0009] Residual drying with cold air can be carried out. The hot-air rotary dryer system can have a plurality of drying and / or cooling boilers arranged one above the other. The cold air can thus be used for cooling the paper web.

[0010] A float dryer unit (with a housing) can be provided, and one or more (floating) cooling units or float coolers may be provided in each case in one or more floors. However, it is also possible to provide a plurality of drying units (in each case with housing) in the longitudinal direction of the production line and alternatively or additionally in several floors. In the cooling units, a (post-) drying can also take place. The housings can be designed such that they can be displaced within limits. For this purpose, it is necessary for the dryer housing to have sufficient clearance for pushing onto corresponding housing seatings. As a result, in particular heat expansion of the housing structure can be compensated for. The hot air dryer system can also have viewing windows and sliding doors. Peripheral devices, such as fans, stepless AC drives with frequency converters, etc., can also be provided.

[0012] A combination of the wire screen and the round screen can be provided. In the case of a combined arrangement of the wire screen and the round screen, the downstream wire can be provided for the production of paper and the upper wire screen for the production of cardboard.

The formation of sheets on the wire screen is not completed until about 30 to 50 cm after exiting from a material discharge lip, while in the case of the round screen the formation of the sheet is already completed when the ladle drum leaves the trough filling. In the case of the wire, the main fiber orientation in the sheet formation is in the direction of rotation. During the scooping process on the round sieve, the fiber orientation takes place almost uniformly in the longitudinal and transverse directions.

[0014] Suction ground sieves can be designed as so-called troughless suction sieves. The advantage of the uniform fiber orientation is thereby sacrificed, because each individual round screen has a closed pressure head as on a four-wire screen machine. However, each individual sieve retains its essential advantage, namely the temporary displacement of the individual round sieve against the simultaneous drainage on a four-wire screen machine. Thus, an advantage of the round sieve compared to the dewatering on a wire mesh is speed. The dewatering of the round sieve takes place successively in succession - from round sieve to round sieve, which results in higher speeds of a round sieve carton machine compared to a four-sieving machine.

[0015] In one exemplary embodiment of the invention, a cutting system with bypass can be provided. Through the cutting system with bypass, paper as well as cardboard and corrugated base paper can be processed in the production line.

[0016] A final group can only be provided for cardboard corrugated paper and / or a single-needle binder part only for cardboard. In the final group, rolls (instead of sheets) can be produced because corrugated cardboard machines can only process rolls. With the Nadellochbügelparty, the cardboard manufacturers can be afraid of customer complaints, which always occurs when something new is used, such as a dry-air float drying instead of the previous dry cylinder contact drying with steam.

[0017] The back-wetting of the pulp web, in particular by means of corresponding roller arrangements, can be carried out by means of the needle-stud portion. The needle-stud portion can be arranged in the storage section.

[0018] In a further exemplary embodiment of the invention, a drying unit can be provided in front of the at least one potash press. By means of the drying unit in front of the calibration press, the pulp web can largely be transferred to the hot air dryer system in a pre-dried form. The hot air dryer system can therefore be dimensioned smaller. The drying unit provided before the calibration press can be designed above the wet part, in particular in the case of round sieves, or as part of the wet part, especially in the case of long sieves. The drying unit can have a metal screen or a wool felt as a pulp carrier.

[0019] It is particularly advantageous if the industrial air dryer system has a three-part version with drive, support and tensioning rollers arranged in V-shape. The cables can be designed in submarine cable quality. The three-way performance can have a lower section and two upper strings. Furthermore, hippo drag openings can be provided and two sections can be provided for two different dryer areas, for example for thicker and thinner cartons, thinner pulp or thinner corrugated base paper such as, for example, corrugated material and blanket. Depending on the design of the cables or special cables, the cable can be laid inside or outside the machine or the housing.

According to the industrial air dryer system, a belt transport section can be provided with driven, antistatic and temperature-resistant sub-belts of approx. 10 cm width, with upper belts of approx. 5 cm width up to a vertical storage section for a receiving capacity of approx. 300 m or more web length , Apart from the storage function, this route also has the task of serving for partial re-moistening of the material web and for cooling it by means of two rotor disks housed in the roof of this section, with spray mist nozzles, with water connections. The performance is best done by means of a separate rope hoist, as mentioned above. Furthermore, an air-conditioning in the housing is advantageous, as well as possibly a needle-stud portion, in order to close the needle holes.

[0021] It is particularly advantageous if a final group with a lateral trimming section, a flighted-pop-follower with a drum changing device and a reel puller is provided. In particular, a two-sided edge trimming device can be provided. The drum puller can be provided for sleeve-mounted, pneumatic expansion rods. If the production line is intended exclusively for cardboard or pulp, the final group does not have any further parts. If, however, a production of corrugated base paper is intended, a rewinding can be provided in the final group, as a rule comprising a flanged pop-uper with a tambour quick-change mechanism, a web separation device and removal by means of a crane or by roller lowering.

[0022] When using standard tambours, as a rule, cardboard sleeves should be rolled over. Well-known corrugated paper machines have working widths of <2,500 mm. When the corrugated base paper is produced with a suitable narrow paper machine, the cost of a separate roll-cutting machine can be saved as a re-roller. For this purpose, it is advantageous if, at the same time as the pop-uper, the pneumatic expansion stub of a diameter of 150-300 mm is wound on a sleeve, and the expansion stub is subsequently removed by a drum pulling device. This results in rolls of 150-300 mm nominal width for the corrugated cardboard machine. The two-sided edge trimming can be carried out immediately before or at the pop-uper. For high-speed rolls, an automatic edge control can be used to keep the marginal strip width as small as possible. With narrow raw paper machines can be produced faster and cheaper than with wide machines.

[0023] According to the invention, a strip-feeding device can be provided. The spreader strip width can be approx. 10 cm. The conveyor belt transport to the first calibration press can be carried out by means of stainless steel trays with air support. The calibration press can be used for further dewatering or, preferably, as a balancing balancing and for leveling the web thickness. Two calibration presses in tandem arrangement can also be provided. Furthermore, smoothing calenders can be provided for surface smoothing of the web.

[0024] A BG-compatible (Berufsgenossenschafts-compatible) solution is necessary for rope threading threading. This consists of a hippopotrack with an advanced submarine rope pulley and two rollers offset laterally and slightly offset to the rear for the two rope upper strands. The feed strip feed is effected by a specially shaped sheet metal.

[0025] According to one embodiment, at least one, preferably a plurality of compensating devices can be provided for compensating for longitudinal shrinkage at a standstill. In particular, a dancer roller member can be provided for compensating the longitudinal shrinkage at a standstill. An additional load-cell-mounted tension measuring roller can be provided for running measurement and regulation for continuous operation, with corresponding web wrapping. After the storage section, a dancer roller can again be provided, which serves to compensate for the longitudinal shrinkage and a certain longitudinal expansion. This dancer roller can be designed with a pivot arm mounting and a rotary potentiometer in the center of rotation for measuring the web tension and for regulating the tension at the cross cutter inlet.

In this context, it is advantageous if at least one, preferably several, tensile measuring devices, in particular tensile measuring rollers, are provided.

[0027] According to one embodiment it can be provided that the cutting system comprises at least one cross-cutter and one, preferably two, longitudinal cutter. The cross-cutter can be designed as a so-called inline simplex cross cutter fully synchronized with the web speed. The cross-cutter can have two material bottoms with reversing switches for the production of large stacks or for single stacking weights up to about one tonne. Only a good arch support with intermediate stacking by Stabrost would be ideal, but would be excluded, because the Stabroststapelungstaktzeit would be insufficient.

A ton is the desired value as a stacking weight since this can easily be divided laterally into half piles of 500 kg or small piles of 250 kg. In a standard format of, for example, 700 mm width x 1000 mm length, a net stack height of 1350 mm, a specific weight of, for example, 1, the stack weight is 945 kg and can be brought to precisely one tonne within a few seconds by adding a few fewer sheets. Furthermore, the machine preferably has a negative arch support of, for example, a maximum of 1000 mm height, arranged on a so-called shuttle car for extending, either on the guide or lift side. A reject sluice can be actuated automatically or manually, whereby the manual control takes precedence by ignoring or overriding the automatic control.

The pallet-free stacker can be stacked on the conveyor belt on both sides of the conveyor and can be extended laterally, or pallets can be provided for subsequent roller conveyor sections. It can be provided that several format sizes can be programmed and used for the automatic format adjustment of the front and side vibrator plates in the two material sheets shelves as well as for the correction of the format adjustment on the negative arch tray as well as for the format adjustment on longitudinal and cross cutters etc.

[0030] The storage device can have vertically movable rollers. The storage device can be designed for a capacity of, for example, 300 m or more, whereby it would be ensured that, with an automatic format adjustment on the cross cutter, it is possible to continue the road at full speed while the cross cutter is standing. In this case, the store is filled and can then be dismantled slowly, without great changes in the tensile strength. In this case, up to 30 or more pairs of rollers can be used, which can be moved up and down via driven threaded spindles. The pairs of rollers can be mounted at a distance of approximately 20-30 cm to allow for a repositioning therebetween by a new cable carrying section. In this case it can be provided that the upper rollers 2, 5 m downwards and push the lower rollers upwards approx. 2.5 m upwards. The threaded spindles can be attached to a supporting frame and supported by means of half-shells on a ball bearing ball so that canting is not possible.

In the production line according to the invention, it is possible to provide up to ten, preferably eight, troughless suction primers or former discharges, in particular top-molds, gap former. In the suction screen, a pressure head can be provided in the direction of the direction of rotation of the screen suction roller or counter to the direction of rotation of the screen suction roller. The pressure headbox can have a conical cross-diverting tube. The suction suction rollers of the sow base can be completed by in each case one suction roller designed as a single-chamber suction roller. The upper cloth of the suction wire sieves can only be formed from wool felt. The sieve suction rollers can be provided with a coarse-mesh lower support screen fabric, in particular stainless steel wire fabric, and a finer mesh upper fabric, in particular stainless steel wire fabric, To be strung. The suction-flow sieves or dissipating shapers can be designed without external extractor rollers and with at least one, preferably two, inner cover roller.

For cardboard up to, for example, about 1000 g / m 2 (about 2.3 mm thickness), it is preferably possible to provide eight troughless suction belts of the fourth and fifth generations of 1200-1300 mm diameter, wherein the suction feeders can be covered with a double-layered plastic screen. In the case of fourth-generation suction screens, a closed pressure-flow run-up, ie in the direction of rotation of the screen suction roll, can be provided. In the case of fifth-generation suction screens, a closed pressure-flow inlet can be provided on the left, in particular counter to the direction of rotation of the suction-suction roll. Fourth generation suction cups are preferably used for making cards, pulp, and the like, but not for so-called test liners. Suction flow sieves of the fifth generation are preferably used only for test liners.

The sieve suction rollers can be mounted on a retractable and retractable carriage with a one-sided toothed belt, wherein a rotary drive can be provided on the guide side and an extension drive on the drive side with tooth rods and pinion starting aid.

The suction box can be suspended on three cantilevered, free-wheeling rods which can be rotated through 180 °, the traction rods having a diameter of approximately 70 mm. The traction rods can be mounted in a double frame with spacer sleeves. The suction box can have four suction chambers with soft rubber coatings and deflection compensation. An extension drive can act on two drive-side extension roller rollers. The Sie-bsaug roller can be supported in the non-perforated edge area by two rubberized support rollers. The sieve suction roll can be driven by means of spoked wheel inserts on the driver's side. The pressing roller can be designed as a single-chamber suction roller, with and on the top, by means of rotary cam centers. The upper cloth can be designed as a wet fabric in multiple layers. For machine standstills, a set of spray mist nozzles per round screen and built-in spray water spray can be provided as lubricant for the suction roll seals. This results in the theoretical possibility of having such a production line with material web running at night without personnel.

[0035] Furthermore, a horizontal or vertical high-pressure water jet cleaning can be provided for the upper cloth. Underneath the round-wire wet section, flat stainless steel collecting trays with two drains can be provided. An embodiment of the upper cloth only from wool felt leads to a better adhesive capacity.

The headboxes for the round screen preferably consist essentially of a conical cross-distributor tube, possibly with a built-in, driven screw, or else with an external periodic ultrasound device for better fiber interlacing of the fibers in the material suspension. Furthermore, a shaft bulge with a beater roller located therein can be provided in the inserted, ascending transverse slot as far as the actual material discharge lip for impacting fiber knots, with a speed-controllable drive. In addition, due to its drive, the racket roller acts as an end dosing pump in front of the headbox.

At the end of the wet section, a blowing roller with controllable blowing capacity can be provided as a removal and transfer aid for the web and the guide strip on the guide side.

[0038] Furthermore, a pneumatic tensioning device for the upper cloth can be provided. The tensioning can be carried out by means of two outriggers in conjunction with the bearing of the lower inner jacket suction roller by means of methods on the foundation rails and with mechanical wedging on the foundation rails.

At the end of the wet section, a top cloth changing aid can be provided. The towel changing aid may have a towel cloth attachment at the end of the wet section.

[0040] Profile bars with rotary drives can be provided in the fabric run-up of the suction belt sheds or former discharge lines for the production of feed strips. The feed strips can have a width of approximately 10 cm.

[0041] A nirosta tray rail with air support may be provided on a first calibration press.

[0042] Furthermore, air sliding tables can be provided. As a result, intermediate spaces, in particular in the wet area, can be bridged. The sliding tables may have a stainless steel tabletop which may be polished and have a thickness of 0.5-1 mm. Furthermore, bores with a spacing of approx. 10 cm can be provided, which are supplied in rows from pressure chambers located therebelow with compressed air of approximately 2 bar. At the outlet of the air from the bores, a small negative pressure to the surrounding air of approx. 1 bar results which causes the material web to be flattened on the table plate while at the same time sufficient air remains as a sliding film between the material web and the table plate By finger pressure. The compressed air can be provided by a central pressure supply. Alternatively, local compressors can be used.

Two cross-cutting stations in tandem arrangement can be provided according to the invention. As a result, machine stops can be avoided when changing the cross-blade diameter. A second identical drive for the second measuring drum of the cross-cutner can be used, in particular in mirror-image offset: arrangement on the drive side and the guide side of the machine.

[0045] For the longitudinal cutter, an individually driven upper knife can be provided. The longitudinal cutter can have hardened, driven upper knives with side-adjustable holders, the upper knives being arranged opposite a multiple-groove roll. The longitudinal cutter can have an upper and lower support with an electronic positioning. The positioning of the upper and lower supports can be done electronically. This allows an accuracy of one tenth of a millimeter to be achieved. The upper and lower holders may comprise an electromagnetic holder and fixation by three conical fixing pins.

The decisive difference between the cutting of paper on the one hand and cardboard, pulp, cardboard and corrugated cardboard on the other side is based on a thin sheet of paper of about 0.1 mm thickness in the material web thickness of up to over 5 mm , In a cutting operation, as a rule, an upper knife intersects with an under knife with an overlap, which must always be a track larger than the material web thickness. When the knife is delivered from the upper knife to the lower knife, a two-way movement is normally performed "down" and "down". Furthermore, a so-called pre-cutting angle of approximately 1 ° -3 ° is worked on paper machines and the blade overlap is kept as low as possible for a good cut.

It is advantageous to use upper and lower knives driven on both sides instead of friction-driven upper knives, as well as a retraction and retraction as a two- or triple-movement movement, ie 1-2 mm settling, raising or pushing, then oblique position, eg 45 °, Or the flat position, eg 90 °, of the upper blade. In the production line according to the invention, a completely automated production process is conceivable. A blade change for the longitudinal section must therefore not cause downtime. It is therefore advantageous if two identical longitudinal cutters are provided in tandem arrangement and in immediate succession. These longitudinal cutters preferably have individually driven lower knife holders and also driven individual upper knife holders, Both with automatic synchronous adjustment. Preferably, the two upper blade holders are electrically connected and connected in each of the two longitudinal cutting stations in such a way that the used upper knife of the station, which had previously been cut, runs for approximately 10 seconds and cuts along after the upper cutter of the other station is already engaged and cuts , Only then does the old upper knife go out of engagement, move up or is pushed up and then moves as a three-way movement in the 45 ° oblique position or in the 90 ° -fill position, in order to be newly equipped. 10 seconds and cuts after the upper knife of the other station is already engaged and cuts. Only then does the old upper knife go out of engagement, move up or is pushed up, and then moves as a three-way movement in the 45 ° oblique position or in the 90 ° -fill position, in order to be newly equipped. 10 seconds and cuts after the upper knife of the other station is already engaged and cuts. Only then does the old upper knife go out of engagement, move up or is pushed up, and then moves as a three-way movement in the 45 ° oblique position or in the 90 ° -fill position, in order to be newly equipped.

[0047] The longitudinal cutter can have an electromagnetic knife holding plate with three conical fixing pins. The upper cutters of the hitherto cutting longitudinal cutting station can be removed by a robot arm and re-fitted by gripping the grippers of the robotic arm, lifting and removing the knives of the pre-cutting station. Furthermore, it can be provided that the upper knives are no longer screwed to the upper knife holders, but are magnetically fixed and held laterally by the gripping tongs of the robot arm via three conical fixing pins of an electromagnet holder plate on the upper knife holders as soon as the electromagnet receives current. They are held there for as long as the holder remains energized.

For longitudinal cutting on thick cardboard, cardboard and corrugated cardboard in the thickness range of 2.5-5 mm, it can be advantageous to provide hardened, driven top knives with a manually or automatically adjustable side holder for longitudinal cutting with an extremely high advance against a multiple grooved roll as a counter- , Whereby the top knives can rotate with approx. 300% advance against the groove support roller and are thus literally sawing through the material web.

In addition, a pneumatic pressure roller can be provided, which is provided against the last paper guide roller from below, in front of the cross-cutter inlet in order to provide an additional clamping press for the web fixation at a standstill and for relieving the cross cutter feed press in order to avoid dents in the neoprene jacket of the feed press. Furthermore, a cross-cut feed apron can be provided for the automatic feed of the material web into the cross cutter. The cross-cut feed apron can either have a driven belt system or a screen apron with vacuum and air support or the like.

[0050] It may be provided that the machine or production line according to the invention is operated by means of frequency-controlled three-phase motors. For the control, a sound-damped cab can be provided on an extension of the cross-cutter circulating platform on the driver's side. Four speed settings can be provided: a creep operation in five minimum steps of 1-5 m with self-locking and audible click, speed of 12 m / min with screen point and click, open driving on the cross cutter with a gap of 70 m and the desired operating speed by means of rotary hemostat From 150-300 m.

[0051] The electrical cabling can be carried out by means of a line connection in the floor or, on the side, highly suspended cable supplies on the machine. Furthermore, a display lamp with a 45 ° rotation can be provided above the cross cutter for indicating the residual moisture or the atrode content and the web temperature.

When the stacks are transported laterally, they can be successively pulled apart, so that an interspace is formed, for example, For pushing over a shrink film hood.

[0053] If corrugated base paper is to be produced, the cross-cut cutter is not required. This can be crossed, for example. The bypass is used for this purpose. For reeling, the use of the flying reel change is proposed. For the flying reel change at the roll-off side of a corrugated cardboard machine, expansion-sleeve tubes with sleeve-shaped sleeves, plastic sleeves or aluminum or steel sleeves should be provided. In addition, a tambour pull-out device with expansion bobbins, including preparation by means of double-sided adhesive tape for web acceptance after the severing process, is advantageous.

The corrugated paperboard rolls produced in this way can thus be delivered to sleeves on the corrugated cardboard machine and taken up there without a rod.

On the other hand, if the cross cutter is used and thus sheets are cut, these sheets have to be stacked. For this purpose it is proposed to use pallets made of impact-resistant plastic. These should have an undercutting of approx. 1 cm below the respective format size. Advantageous are pallet size markings of different colors on lowering platforms and sliding pallets for pallet fixing and guidance during extension. Furthermore, needle bearing bed strips for extension support, in conjunction with pneumatically or hydraulically actuated pusher plate on the driver's side are advantageous. Also a colored pallet magazine for the most common main formats is advantageous. Shrink film packaging in combination with plastic pallets is a suitable packaging option. A shrink film in conjunction with a plastic pallet, even when exposed to the rain, is free of rain and is not subject to any contamination. The shrink film hood can be applied by means of an inverted robot.

Further features and advantages of the invention will emerge from the following description of an exemplary embodiment of the invention, with reference to the figures of the drawing showing the essential details of the invention, and from the claims.

A preferred embodiment of the invention is shown schematically in the drawing and is explained in more detail below with reference to the figures of the drawing.

[0058] FIG.

FIGS. 1a, 1b show two parts of a production line according to the invention, wherein FIG. 1b is connected to the right of FIG. 1a; FIG.

FIG. 2 shows the embodiment of a three-wire embodiment; and

FIG. 3 shows a front part of a further exemplary embodiment of a production line according to the invention with an upstream drying unit.

A production line 10 is shown in FIGS. 1a, 1b. A wet section 11 has, in the exemplary embodiment, eight troughless suction sieves 12 to 19. The screen suction rollers 20 to 27 have a lower coarse mesh screen and an upper fine mesh steel screen. The material of the upper cloth is either needled wool felt fabric with a Clippernaht or a multi-layered plastic fabric with sewn seam. The upper cloth (to be seen together with the paper run in the figure) should have the highest possible adhesion behavior. A press 30 is arranged downstream of the wet section 11 before a hot air dryer system 31 follows.

In the exemplary embodiment, the hot-air rotary dryer system 31 has an effective dryer section of 72 m divided into three sections of 24 m each, of which each section is subdivided into 3 × 8 m dryer sections. The hot air temperature is about 300-350 ° C. The hot air dryer system 31 is heated with natural gas or liquefied gas. The sections of the hot-air dryer system 31 are designated by the reference numerals 32 to 40. The sections are arranged in different floors, in the exemplary embodiment in three floors. The material to be dried is guided over deflecting rollers 41, 42. The flame height or temperature control can be stepless, manual or automatic. A circulating air distribution is 2/3 from the bottom and 1/3 from the top. Peripherals may be provided at the hot-air suspended-drier system 31, Such as external fans and actuators (not shown), burners and combustion chambers, exhaust air and fresh air supply. For the two upper floors, walkways with stairs and railings can be provided on the guide. Furthermore, viewing windows with interior lighting are provided for path monitoring. Cross-web webs can also be provided. The deflection rollers 41, 42 can be designed as air cushion deflection rollers.

In the transitional area between the hot-air suspended-steam system 31 and a storage device 45, a compensation device configured as a dancer roller member 46 can be provided. This can be provided for pulling and tensioning. It can have driven, temperature-resistant antistatic subbands and top bands. The storage device 45 has rollers 47, 48 which are vertically movable in order to change the storage path. The secondary function after storage is the air-conditioning of the train for cooling and partial re-moistening by means of two nebula emitters 49, 50 which are mounted on the storage roof. An air-conditioning monitoring station can be provided in the storage device 45.

During the storage filling, there is an increasing increase in the tension for the material web, which can be compensated for only a few seconds by the buffing function of the two compensating devices 46, 51. For this reason, it is expedient to provide an automatic change-over of all track-dependent electric drives from a speed control to a train control.

Claims (9)

1. The cutting unit 52 has two longitudinal cutters 70, 71 in tandem arrangement as well as transverse cutter 73 in tandem configuration. The sheets cut off by the cross cutter 73 are stacked in stacking devices. In the closing group 54, a retractor is provided. A feed press 72 is provided upstream of the cross cutter 73. In addition, a trimming cutter 74 is shown. FIG. 2 shows a three-part embodiment in a V-shaped arrangement. In FIG. 2, a lower cable strand 60 with a diameter of approximately 10-12 mm is shown. This is located in the center of the strip. The two thinner upper strands 61, 62 have a diameter of approximately 7-8 mm. You can move up to the position shown, wrapping the strip and holding it laterally. [0065] The paper or The carton is placed in the wet state around the thicker lower strand 60 and the two upper strands 61, 62 both press the paper 63 over the thick bottom strand 60. FIG. 3 shows a further exemplary embodiment of a production line 100 according to the invention. In contrast to the production line 10 according to FIG. 1, the production line 100 has a drying unit 102. In the drying unit 102, the pulp obtained in a wet section 110 is supported by a screen 104. The drying unit 102 is arranged above the wet part 110. In the case of longitudinal sliding, the drying unit 102 can also be arranged directly in the wet section. The pulp, after leaving the drying unit 102, has an atomic content of more than 70%. A hot air dryer system 310 can therefore be dimensioned correspondingly small. In this case, the hot air dryer system 310 consists of a hot-air drying station 320, to which two cooling elements 330, 340 for cooling the pulp are connected. The cooling loops 330, 340 are designed as float coolers or have float coolers. 3, however, can also be used in production lines which do not have a drying unit arranged upstream of the calibration press. The hot-air dryer system 310 according to the exemplary embodiment shown in FIG. claims Have float coolers. 3, however, can also be used in production lines which do not have a drying unit arranged upstream of the calibration press. The hot-air dryer system 310 according to the exemplary embodiment shown in FIG. claims Have float coolers. 3, however, can also be used in production lines which do not have a drying unit arranged upstream of the calibration press. The hot-air dryer system 310 according to the exemplary embodiment shown in FIG. claims

   Anspruch [en] 1. A production line for paper, cardboard and corrugated base paper, comprising: a. A wet part (11, 110) having a plurality of suction pads (12-19) or elongations or discharges thereof; b. At least one calibration press (30); c. A hot air dryer (31,310); Characterized in that the hot-air dryer (31, 310) is designed as a hot air dryer system with a plurality of drying (320) and / or cooling booths (330, 340) disposed one above the other.
2. 2. Production line according to claim 1, characterized in that a cutting installation (52) with bypass (53) is provided.
3. 3. The production line as claimed in claim 1, characterized in that a closing group (54) is provided only for corrugated paperboard webs and / or a needle-wire ironing part only for cardboard.
4. 4. The production line according to claim 1, wherein a drying unit is provided in front of the at least one calibration press.
5. 5. The production line according to claim 1, wherein the hot-air dryer system is liquefied by liquefied natural gas or natural gas.
6. 6. The production line according to claim 1, wherein the hot-air dryer system (31, 310) has a three-part version with drive, support and tensioning rollers arranged in V-shape.
7. 7. The manufacturing line as claimed in claim 3, wherein the end group is provided with a lateral trimming section, a horizontal pop-uper with a drum changing device and a drum puller.
8. 8. Production line according to claim 1, characterized in that a strip-feeding device is provided for the calibration press (30), wherein the strip-feeding is carried out by means of tray rails with air support.
9. 9. Production line according to claim 1, characterized in that at least one compensating device (46, 51) is provided for compensating longitudinal shrinkage of the web at a standstill.