DE1796263C3 - Process for impregnating corrugated cardboard and device for carrying out the process - Google Patents

Description

The invention relates to a method for impregnating corrugated cardboard running in the direction of the web, their channels, which are open on both sides, extend in the transverse direction and into these along a longitudinal edge if necessary, an impregnating agent is introduced under the action of pressure, if necessary corresponding effect of an induced draft along

is the other longitudinal came.

Such a method is known from the US patent I 592 824, in which the impregnating agent is also introduced into the corrugated cardboard ducts. Here is the Corrugated cardboard standing vertically on an edge and running the liquid impregnation agent, two-fold thinned asphalt, runs from top to bottom under the action of gravity through the Corrugated cardboard ducts. This USA patent specification 1592 824 contains the reference, the material under pressure to be introduced into the corrugated cardboard ducts from above and, if necessary, to induce suction at the lower edge, However, these notes are therefore meaningless for the method described and can not used in connection with this procedure because of any pressure when applied or suction conditions the specially prepared and equipped corrugated cardboard: with funnel-shaped opening, protruding deek-layer flaps can be processed further by collapsing them would make impossible. At the USA Patentschnli is solely based on the effect of gravity to transport the impregnating agent through the corrugated cardboard ducts turned off, which is why you have to work with a liquid impregnation agent. One continuous impregnation in such a way that the impregnation mn the same rapidity and speed successful with which the corrugated cardboard webs run out of the insulation systems is also not possible, as only individual sheets are ever to be machined

4 <embedding urlcr the nozzle can also be brought the displacement of the treated corrugated cardboard webs runs into problems that are almost impossible to solve, so that presumably only a relative shift can be realized can. In this context it should be pointed out

In view of the fact that the process according to this USA patent I 592 824 is similar to a process still used today for the impregnation of corrugated cardboard, in which a very large box-shaped container is provided with a conveyor belt, with a vertical direction.

ss lung extending rods between which the finished Boxes, i.e. the blanks or tails used and then passed through a curtain of wax ■ bumps, the wax due to the force of gravity emwiikuni; through you too: corrugated cardboard ducts run. the

v> Applicable in these 'known processes Handicraft from the Lin'-et / en of the WeHpappetafel in the I r; u: crniech.misnicn to / around Hei except as well as the aiii time / ui treatment are considerable.

I'm far away. similar to U.S. Patent 1,592,824 Process for impregnating corrugated cardboard can the United States Patent 3,343,977 and consists essentially in the fact that the vertically guided Corrugated cardboard web in the leaning direction through a chamber

or a room, although the lower one Edge on rollers run muli, which is easy to one Clogging of the corrugated cardboard duct openings. and from above with the help of a Flußkamtner the corrugated cardboard the impregnating agent / ugcfiihri is the s then also flows downwards under the influence of gravity and the corrugated cardboard in all areas, that is also on their outer surfaces with the impregnating agent provides.

F.s seems doubtful whether such a process is technically feasible, in any case it arises here, as well as in the method according to the LJSA patent 1 592 824 the disadvantage that no control over the wax content of the impregnated corrugated cardboard web can be achieved, which is highly desirable for various reasons.

An impregnation process actually carried out of corrugated cardboard, however, is that a conveyor belt circulates in a very large housing, to which finished blanks of corrugated cardboard are clipped by hand and that these blanks then passes through an immersion bath, where the panels can become saturated with impregnating agent. Afterward The corrugated cardboard sheets pass through a hot air and a drying chamber and are then made by hand removed from the conveyor belt. Here, too, there is the disadvantage that a control over the Wax content is of course not possible, in addition, such a process is still flammable very awkward, complicated and slow.

Finally, the magazine "Tappi 43" (1% 0) Issue 3, pp. 210A to 213A, different coating materials which are suitable for impregnating corrugated cardboard, including foamed cardboard Plastic. In the following, this publication then mentions various processes and processing options for applying a coating agent to corrugated board, including curtains and fog coaters, which apply a uniform film to rough and flat surfaces can, furthermore, pressure or heating spray units for applying waxes. Plastics and high strength coatings, catalytic sprayers for spraying foams on specific Areas and the like, but with an internal impregnation, that is, an impregnation of the corrugated cardboard ducts as well is rather coincidental and cannot be reached in an impeccable manner.

Another publication, namely the magazine "Tappi 46" (1963) issue 1. on pp. 172A to 178A can then also include the coating of corrugated cardboard one; m impregnating wax using a curtain coater be removed; the corrugated cardboard is cut continuously supplied to a rotating belt, which the blank through a falling film of the coating material wearing. Here, too, the impregnating curtain is applied to the outer surface or surfaces of the corrugated cardboard, such as carried by the continuous belt. The disadvantages are also mentioned here Impregnation of gaining control over the effective wax content of the impregnated corrugated board and especially the fact that it is not possible in this way, for example the outer surfaces to keep the corrugated cardboard to be impregnated essentially free of the impregnating agent, thus this can be printed, for example.

The object of the invention is to provide a method for the impregnation of in Bahnnchtung within a normal To create wool cardboard plant running corrugated cardboard, which makes it possible that dk corrugated cardboard with the Speed with which it moves through the manufacturing plant runs, in their toilet paper ducts with a Impregnating agent can be provided, its content can be set precisely.

The invention is based on solving this problem of the method mentioned at the beginning and, according to the invention, consists in that the web of cardboard is continuous is advanced in a horizontal plane and into the channels of the corrugated cardboard at exclusive action of the induced draft at the opposite edge creates a mixture of particles of an imprä gnierniittels and a gaseous and / or vaporous carrier medium is introduced.

In this way, there is the advantage that one a fully impregnated corrugated cardboard with a low, fully controllable and adjustable wax content, aikh double corrugated cardboard, with the Surface of the impregnated corrugated board excess wax is not deposited, actually the wax content the whole corrugated cardboard can be adjusted so that printing on normal Corrugated cardboard processing machines also impregnated corrugated cardboard and gluing is possible.

It is also of particular advantage that the cardboard can be processed very quickly and continuously Form is possible, with only a relatively short device must be provided. the one between the short sheeter and the triplex device of a normal corrugator can be arranged. the Corrugated cardboard coming from the actual corrugated cardboard plant runs through the impregnation station with the same speed with which it is produced and then leaves it grooved and cut.

Further refinements of the invention are the subject matter of the subclaims and are laid down in them.

In the following, the structure and mode of operation of exemplary embodiments of the invention and of the inventive Process explained in detail. It shows

F i g. 1 in a schematic representation an impregnation device in side view,

F i g. FIG. 2 is a plan view of the device of FIG. t that

F i g. 3 and 4 each show a detail section of the device according to FIG. 1 on a larger scale,

F i g. 5 shows a modified embodiment of the illustration the F i g. 4,

F i g. 6 a Schemadarsteüung over the course of the de; Impregnation process with corrugated cardboard running in the direction of the web, the

F i g. 7, 8 and 9 show further schematic representations of further possible impregnation processes,

Fig. 10 shows an embodiment of the inlet or suction bar in perspective view,

F i g. 11 shows a cross section through the squeegee F i g. 12 shows a cross section through the inlet bar, which

13 shows a perspective illustration of eii exchangeable section of the suction bar according to FIG. 11

Fig. 14 also shows in a perspective view! ment an exchangeable section of the inlet bar according to Fig. 12. die

Fig. 15 shows in cross section a nozzle which

F i g. 16 a screw plug for a Düsenbor tion that

Fig. 17 shows an embodiment of a nozzle structure for introducing the impregnating agent together with a gaseous or vaporous carrier medium «M in the corrugated ducts that

Fig. 18 shows a nozzle for a liquid jet And the

F i g. 19 a pressure nozzle for airless injection.

In the case of the in FIG. 1 shown impregnation device 1, the corrugated cardboard web 2 runs with its longitudinal edges on the one hand an inlet strip 3 and on the other hand a suction bar 4, both of which are designed as elongated, subdivided housings. The infeed bar 3 is how F i g. 3 shows, provided with guide rails 5 for guiding the web of corrugated cardboard 2. The guide rails wear on their outer longitudinal edges on the top and bottom of the corrugated cardboard web 2 adjacent Sealing lips 6 made of elastic material. In a similar way are also on the front and end faces sealing elements 7 resting against the inlet strip of the corrugated cardboard, as in FIG. 2 indicated, provided. At ao the embodiment of FIG. 2 connects at the inlet of the inlet strip 3 to the sealing element 7 of the Inlet bar an empty zone 8, which is connected to a suction box 32 by a suction line 12. The empty zone 8 is followed by the inlet zone 9 with the impregnating agent inlets 14, which can be regulated by means of throttle elements 15 (FIG. 3) with adjusting screws 16. To the Inlet zone 9 is followed by a pressure zone 10 for the supply of hot compressed air and a pressure zone 10 Pressure zone 11 for the cold compressed air supply. The hot and cold compressed air supply is with adjustable inlets 17 (Fig. 2). In the area of the impregnating agent inlets 14, the inlet bar 3 is provided with electric heaters 18 (FIG. 3), whereby they in their Whole is heated. The impregnating agent is in liquid form through a line 19 from an impregnating agent container 20 related. The inlet bar 3 is adjustable by means of a flange 21 (Fig. 1) Mounted frame of the impregnation device and adaptable to the edge of the corrugated cardboard web 2.

In the elongated suction bar 4 (FIGS. 2 and 4) guide rails 22, 23 are installed to guide the opposite edge of the corrugated cardboard web, which guide rails 22, 23 pass through the housing 4 in a longitudinal slot 24 serving for the inlet of the corrugated cardboard. The longitudinal edges of the guide rails 22, 23 protruding from the longitudinal slot carry flanges 22 ', 23'. which abut the outside of the housing 4. The flange J3 'is screwed to the housing wall of the suction bar 4, while the flange 22' is adjustable by means of guide slots 25 on threaded bolts 26 of the suction bar 4 and can be locked by nuts 27, so that an adjustment of the guide distance d between the guide rails 22, 23 is possible. Elastic sealing lips 28 are attached to the flanges i22 \ 23 ', which protrude above the outer longitudinal edges of the guide rails 22, 23 and lie against the bottom and top of the corrugated cardboard web 2. With 29 arranged near the outer longitudinal edges of the guide rails 22, 23 are designated air suction holes. The suction strip 4 consists of separate chambers, each of which is provided with suction nozzle 30 (FIG. 4), which, as shown in FIG. 1, they are connected to the corresponding chambers of the suction box 32 by hoses 31. These chambers are in turn connected by lines 33 with a vacuum pump 34 (and, if necessary, with additional suction units), which is driven by an electric motor 35. The suction box 32 with its chambers serves as a vacuum container and pre-separator. The outlet of the suction pump 34 is connected by a connecting pipe 36 to an impregnating agent separator 37, from which the recovered impregnating agent is fed to a collecting container 39 through a return line 38, which is only partially indicated. From there, the recovered impregnating agent passes back through a line into the impregnating agent container 20 of FIG. 2.

The impregnation itself takes place in a preferred embodiment as follows: The The finished corrugated cardboard web 2 passes through the impregnation device with both of the longitudinal edges having the open corrugated channels 1 at a speed of 60 to 120 m and more per minute, with the longitudinal edges the corrugated cardboard web on the one hand in the inlet strip 3 and on the other hand in the suction strip 4 under tight Are completed. The suction bar 4 ensures that the air in the corrugated ducts is emptied. In The suction bar is built into a heater (not shown) so that any impregnating agent that may have been sucked in can be removed does not precipitate and can cause constipation. As a result of the 2 to 3 η long Suction bar 4 evenly distributed suction nozzle 30, there is a uniform vacuum in the suction bar, which is generated by the vacuum pump 34. Since the suction box 32 also acts as a liquid separator, no liquid impregnating agent can get into the pump 34. From the also heated separator box 37 is then the separated impregnation liquid through a heated pump system, not shown conveyed back into the impregnant tank 20, so that a self-contained cycle of the impregnant arises. The air cleaned of the impregnation agent in the separator box is then used Compressed air organs supplied to the inlet bar in order to utilize the operating pressure of the pump. Under the effect the vacuum generated by the suction strip 4 in the corrugated channels of the corrugated cardboard web 2 becomes the impregnating agent sucked into the corrugated channels of the corrugated cardboard sheet in the area of zone 9 (FIG. 6). thanks to the The heater 18 of the inlet strip 3 has the impregnating agent the desired high temperature when penetrating the corrugated channels. Because of the high speeds, The impregnation system on high linen is also necessary for profitable corrugated cardboard production designed and equipped with high-performance units. From the throughput speed of the corrugated cardboard web 2 and the speed of the impregnating agent achieved under the suction of the squeegee in the corrugated channels, as shown in FIG. 6 shows, of the Inlet bar 3 to the suction bar 4 is a diagonal flow band 9 '. The subsequent hot-compressed air zone H and cold compressed air zone 11 ensure the drying of the corrugated channels wetted by the impregnation agent.

The aim for the impregnation process is as high a vacuum as possible, which is continuous and constant acts moderately and copes with a large amount of air. J <the higher the vacuum, the greater the acceleration and the speed of the impregnating agent in the corrugated channels.

Since the cover layers (outer papers) of the Wellpar. pebahn 2 are porous, in the evacuated state of the corrugated channels a considerable amount of false air penetrates through the pores of the cover layers into the corrugated channels, resulting in a significant loss of vacuum. It has been shown that a coating medium applied in front of the impregnation device, such as a fine

509 625 /.

iVasser film for the purpose of maintaining an impregnable ^ The surface of the corrugated cardboard sheet free of fuel here also results in a good seal of the pores and (thus increasing the vacuum.

The sealing of the corrugated cardboard can also be achieved with other suitable measures of a mechanical nature. ! will be enough, e.g. B. by the arrangement of shielded Vacuum zones above and below the corrugated cardboard, but also in particular by being attached like a caterpillar rolling sealing film strips, etc.

A preferred method for introducing the impregnating agent into the channels of the horizontally passing Corrugated cardboard web 2 consists in that the liquid impregnating agent is used as a spray, i. H. as a spray in the Corrugated channels arrives, with adjustable metering pumps that can be installed in the inlet side, which carry the impregnating agent Inject with adjustable pressure through nozzles or otherwise press into the corrugated channels. With a special device, the impregnation liquid can be sprayed airlessly into the corrugated channels under high pressure and finest atomization, which enables a particularly intensive impregnation light, the impregnation agent also intensively with air mixed, for example, sprayed directly into the corrugated channels according to the principle of a spray gun, what the impregnating agent gives the desired initial speed. The impregnation agent is transported thus only through the vacuum suction, while the speed of the impregnating agent through the corrugated channels depends on the strength of the air supply. In this context one can stand out especially operate an injection device as shown in FIG. 17th is shown. The injection device shown there consists of a, for example, an lmbus screw formed nozzle 53, the continuous cavity 57 of a feed pipe 58 for the liquid impregnating agent is permeated. The feed pipe lies concentrically with the formation of an intermediate space 59 in the cavity 57. This intermediate space 59 enables the entry of air from a pressure chamber 47, as indicated by the dashed arrows 60 reveal. The compressed air emerging from the space 59 tears there;, through the supply pipe Impregnating agent flowing into the nozzle in such a way that a fine spray mist is produced. This The spray mist method is particularly suitable for the internal treatment of corrugated cardboard, as it has the finest degrees of wetting can be worked and it is possible to carry out the impregnation so that ! The top layers of the corrugated cardboard in whole or in part Remain free of the impregnation agent and therefore inscribed-Ibar, can be printed and glued.

The impregnating agent then becomes under the enormous suction effect of the vacuum established on the suction line side in the finest atomization and high density together with the sucked air flow into the 'corrugated cardboard ducts sucked in, the production of such a spray being particularly economical Possibility of introducing a liquid impregnating agent into the corrugated channels of the corrugated cardboard.

Further possibilities, the impregnating agent in the form of a spray mist, i.e. an aerosol, into the corrugated cardboard ducts introduce, for example, that the impregnation in the form of a liquid curtain flows past the openings in the corrugated cardboard ducts and the impregnating agent flows through the The vacuum prevailing in the corrugated cardboard ducts is sucked in; it is also possible to use a suction trough, for example angled slightly downwards, to connect to the openings in the corrugated cardboard ducts, in such a way that the Vacuum tears up the liquid impregnating agent located in a suction trough and through the corrugated cardboard ducts sucked through.

This spray mist impregnation process results in a dynamic spray mist or impregnation agent distribution in the by the impregnation device

ίο running corrugated cardboard as shown in the fig. 2 as well as 6 and 7 or in a modification of the procedure also the F i g. 8 and 9 can be seen.

Like F i g. 6 shows, the inlet section is a short, active or passive sealing zone 8 ahead, which allows the vacuum to build up.

That which penetrated into the corrugated cardboard channels during the passage of the corrugated cardboard through the impregnation device A mixture of particles of an impregnating agent and a carrier medium forms small particles in them Columns which in their entirety form a strip 9 'diagonally across the entire width of the corrugated board during the Form pass that the corrugated cardboard web thereby more or less diagonally in two vacuum zones separates, the suction-side vacuum pulling and the vacuum building up on the inlet side braking works.

Since this braking effect is undesirable and can only occur if the entire inlet side is hermetically sealed, this explains the need to allow metered air to flow in directly to the inflow zone 9 (for example, FIGS. 2, 6 and 7) of the impregnating agent . Since this air can penetrate already under normal air pressure and on the other side of the diagonal strip 9 ^r nor the desired vacuum is effective, it is able to accelerate the flow speed of the impregnating agent or the impregnating agent containing the mixture. The flow rate of the impregnating agent can thus be regulated by a controlled supply of air.

The on the adjoining the inflow zone 9 Air supplied to zones 10 and 11 on the inlet side can be compressed air which has been specially developed for this purpose Nozzles under high pressure and high speed in zones 10 and 11 directly into the corrugated channels is typed in. However, this can cause the impregnation process to cool down suddenly and stop lead, so that the compressed air supplied in zone 10 is previously heated to at least 120.degree.

For the final cooling of the impregnated corrugated cardboard ducts, immediately after the Hot air zone 10, cold compressed air is used in zone 11, which is then spread through both sides of the corrugated cardboard web 2 open corrugated cardboard channels volatilized.

The same purpose of cooling also serves in the case of a top layer wetted with a water film The corrugated cardboard is ventilated from the outside with a warm or cold air flow from the one rapid evaporation of the water film and thereby intensive cooling of the corrugated cardboard.

The inlet bar 3 and the suction bar are also corresponding to the temperature of the impregnating agent heated, whereby it is effected in the area of the inlet bar 3 that the necessary for the impregnation Terr

G ₅ temperature of the impregnation agent is maintained; In the Bs area of the suction bar 4, on the other hand, the impregnating agent residues do not solidify, but get into the ash separator and from there back to the inlet bar.

So that the vacuum pump 34 can develop its full effect it is advantageous to use the main amount of air as the corrugated board enters the impregnation device from the outset to be continuously sucked out of the corrugated cardboard ducts by a separate blower.

Since the spray mist reaches a high flow rate through the corrugated cardboard ducts, it is advisable to after filling the corrugated cardboard ducts to stop the flow of the spray mist, which, as shown in FIG. 7th shows, can best be achieved in that the inlet bar 3 is directly adjacent to the inflow zone 9 a hermetic sealing area 40 adjoins, being offset opposite one another and adjoining the suction zone 4 'such a termination area 40 is then provided.

This then follows in the area of the inlet bar 3 the closing area 40 again adjoins a compressed air inflow zone 11, which, as already mentioned, is used for cooling and drying of the impregnated corrugated cardboard ducts. Between the two diagonally opposite each other ao Overlying terminating areas 40 thus forms a damming zone adjoining the inflow zone 9, which gives the impregnating agent time into the corrugated cardboard layers to penetrate.

For the prevention of too high Imprägniermitteldurch Atzes ^r in the introduction of the particulate of an impregnating agent and a carrier medium mixture can be admixed to the mixture also by means of special nozzles a swirling twist, so that the spray droplets are hurled into the corrugated channels by centrifugal forces against the inner walls. As already mentioned, the intensity of the impregnation can be controlled very finely, so that an impregnation in accordance with the product is possible; in particular, this also results in a very economical mode of operation.

It is also possible to divide them into a suction area on the one hand and an inlet area on the other to be replaced by a corresponding arrangement of these zones, whereby in place of the difference these Functions A parallel or alternately graded series of functions is possible, which will be explained in the following the F i g. 8 will be explained. When the corrugated cardboard enters the impregnation device, it is initially on both sides the air in the corrugated cardboard ducts is evacuated. then immediately becomes the ruling one Vacuum is filled from both sides with the mixture, which can be a mist, a vapor or a gas. Due to the collision of the two impregnating agent streams, compression is achieved, which is a enables intensive and practically loss-free utilization of the amount of impregnating agent used. Lim to prevent the volatile impregnating agent compressed in this way from flowing out, close as a result of further passage on both sides in turn the already mentioned termination areas 40. These graduated in the order The parallelism of the impregnation process enables perfect impregnation even in extreme cases Whelip paperboard wide and despite high speed the corrugated cardboard. As already mentioned earlier with reference to FIGS. 2 and 6 and 7, respectively, is initially one Empty zone 8 is provided for evacuation, to which the inflow zones 9 and the closure areas 40 connect.

On the basis of FIG. 9, a further exemplary embodiment of a method for the internal coating of corrugated cardboard ducts by means of a spray will now be explained. In the illustration of FIG. 9, the suction zones 4 are 'and the Einströmzonen 9 mutually as compared with that the mixture, ie the spray through each inflow zone 9 to at least de half ^r corrugated cardboard web width in the direction of the opposite suction zone 4' is able to flow. Furthermore, termination areas 40 are provided in FIG. 9, as well as a pressure zone 11 for compressed air on one side. The opposing suction and inflow zones are arranged offset from one another in the running direction of the corrugated cardboard, the suction zone 4 'being separated on each side by a closure area 40 from the inflow zone 9 for the spray mist. The pressure zone 11 for the compressed air then takes care of the removal or complete distribution of the impregnating agent under the action of the suction zone 4 'opposite it.

The impregnating agent uptake of the corrugated cardboard papers, d. H. their penetration depth of the impregnating agent depends on various factors. It can be influenced by changing the speed at which the impregnating agent traverses the corrugated cardboard web as well as by changing the temperature of the impregnating agent. Furthermore, the depth of penetration can be influenced by changing the temperature for the various Purposes required air, as well as through its dosage and change in pressure. There is also a stopping the penetration of the impregnating agent by causing an intensive evaporation of a coating medium, a film of water, for example, from the outside, which creates cold on the corrugated cardboard will. Furthermore, the depth of penetration of the impregnating agent also depends on the speed at which the Corrugated cardboard is produced, as well as the use of various impregnating agents! and their viscosity

Taking these factors into account, any desired impregnation is possible for a wide variety of types of corrugated cardboard possible. For example, it is possible to produce completely impregnated corrugated cardboard, which can be seen from the outside with a darker color on both sides, which depends on the impregnating agent chosen is, can distinguish. Furthermore, the production of a partial, i.e. H. more or less heavily impregnated Corrugated cardboard is possible in which both top layers are "light". Another type of partial impregnation consists in the fact that the corrugated cardboard is "light" on one side and "dark" on the other. or that one side is completely impregnated and the other side is partially impregnated is. where, if required, areas that are kept completely free can be created through targeted wetting from the outside can. In this case, the corrugated cardboard has a "dark" top layer on one side and the other Side on a top layer with "dark" and "light" areas. The partial impregnation can also be carried out in such a way that the corrugated cardboard has "dark" and "light" fields on both sides the latter through the partial use of a coating medium, such as a water film, voi are generated outside. With multi-fluted corrugated cardboard, only one corrugated layer with impregnating agent was added be layer, so that only the impregnation be particularly required outer layer, possibly also In nenschicht is partially or fully impregnated.

The wetting of the cover layers before, while ün after the impregnation zone, if the impregnation is hot, it is due to the effects of heat th evaporation process a suitable mat

would take to preserve the desired corrugated cardboard Moisture and thus serves a double purpose. The suction prevailing in the corrugated channels also pulls one third of the water film into the paper pores, where it is when it encounters the hot medium is re-evaporated. The shielding is created because of the slower flow velocity of water against the air pushing in, and by wetting the topmost paper layer, the impregnating agent becomes prevented from completely penetrating the top layer.

Since the high speed of the corrugated board means that the wetting time is short to increase the penetration capacity, softened the water by adding it. Same purpose also serves to increase the water temperature.

Another way to achieve a reliable seal of the cover layer is that instead of water, a coating medium is applied in a film-like manner to the top layer and inside ao the corrugated cardboard creates a vacuum. A combination of both types of application can be done from the inside at the same time are impregnated with a hot-melt impregnation agent, with an aqueous, cold soluble plastic emulsion the functions of as Water film takes over, in such a way that the water content of the emulsion is volatilized by the heat of the hot-melt impregnating agent, so that a tough, tear-resistant outer layer made of plastic is created.

Another measure to reduce the false surface air is the shielding of the same by sealing cavities above and below the impregnation zone. In their passive function These cavities become through the pores of the paper through the vacuum prevailing in the corrugated channels evacuated and, once emptied, form protective vacuum zones. On the other hand, it can be far more effective Device can be designed by placing both the upper and lower protective shells with the evacuated Cavities have a direct vacuum connection to a blower or a vacuum pump. So can even an external vacuum which is superior in strength to the internal vacuum can be built up, so that in addition the pulling suction creates a suction from the inside to the outside, which causes that to happen at high speed z. B. impregnating agents flowing through in the form of Sprey droplets additionally from the inner area the corrugated channels are drawn outward to the paper layers and from there; particularly intense in penetrates the pores of the paper. Further vacuum zones 8 serve to seal off false air entry points the inputs and outputs of the impregnation device.

By regulating the vacuum conditions between inside and outside, or the amount of false air, which is still able to penetrate, the penetration capacity of the impregnating agent can also be controlled will.

With the same device for creating vacuum zones, the opposite can also be done Pressure zones are established through the reactionary gases are pressed into the paper pores to there a particularly intensive reaction with a reactive impregnating agent that penetrates from the inside to the outside to bring about, with which both an improvement in the quality of the impregnation and a further possibility to control the impregnation process against-through heating plates above and below the passing through Corrugated cardboard can influence the false air that penetrates into the pores of the cover paper in the impregnation station will. The heat warms the air above the papers so that it rises. Through this a pressure relief is achieved. The hot air penetrating the pores also holds the impregnation agent longer hot and ensures that the impregnating agent penetrates more easily due to the strong warming of the paper. In the case of impregnating agents introduced in powder or dust form, e.g. B. Powdered paraffin causes the hot air penetrating the paper pores causes the individual particles to melt immediately.

Instead of heating plates, a device can also be used a magnetic field can be generated which aims to impregnate the impregnating agent which was previously oppositely dielectrically polarized to attract and thus to bring to the deposition on the paper layers proves particularly advantageous This method is useful for easily moving impregnating agents such as sprays, powders and the like For the same purpose, metallic additives that are added to such a medium can also be used, to serve. The dielectric polarization of the impregnation agent can also be achieved without magnets by the corrugated cardboard itself already has a static charge, which can be increased by suitable measures, forms the opposite pole to the introduced medium, which has been dielectrically polarized accordingly.

For all impregnation processes to be carried out, it is important that both the inlet side and the Suction side well sealed on all sides, d. H. Seals clinging to the corrugated cardboard (e.g. elastic Sealing strips) are provided. At the ends of the guide rails, which can be adjusted depending on the thickness of the corrugated cardboard 5 and 22, 23 (Figs. 3 and 4), sealing strips 6 and 28 made of flexible material are mounted in such a way that that they press against the corrugated cardboard passing through under the effect of the suction, as already explained at the beginning. Instead of the sealing strips, the guide strips 5 or 22, 23 can also be narrow in the direction of passage the corrugated board running sealing ridges 5 ', as shown in FIG. 5 shows which can easily be found in the Emboss the top layers of the corrugated cardboard passing through. The lateral entry points for the corrugated cardboard sheet are also provided with snug-fitting sealing elements. A particularly good seal will be achieved by continuously adapting to the horizontal displacements of the corrugated cardboard sheet passing through Inlet and suction strips. The best solution to this problem is that the impregnation device represents a closed unit, so that only ever for the entry and exit of the corrugated cardboard there is an adjustable slot, with the inlet and suction side being interconnected by a closed housing are connected.

The F i g. 10 to 17 now show further embodiments of the individual elements forming the impregnation device, the first of which is based on the in FIG. 10 ge introduced insertion head 43 is discussed in more detail whose zone area formed in the impregnation device corresponds to the empty zone 8 at the beginning of the suction bar 4 or inlet bar 3. The introduction head 43 Sorg for the smooth entry of the outermost Wellpap pebahnkanten, indicated in Fig. 12 with 2 'and bends the cover layers 2 "of Wellpappebahi about plow-like in so far as they have not been previously beschnittei so that it into a cavity 44 Can enter without stopping. The deck

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Layers 2 ″ lie against stop surfaces 44 ′ in such a way that the openings of the corrugated cardboard channels are directly in front of the suction slits 49 of a suction strip sub-element, as shown in FIG. 11, or in front of the Nozzle openings 46 of the inlet strip element of FIG. 12 slide past. In the guide head 43 of the 10, the stop surface 44 also seals the corrugated cardboard channels, which are then subsequently evacuated.

As already mentioned, in FIGS. 11 and 12 off Light metal existing standard elements for the inlet strip 3 and the suction strip 4 are shown, in this case Inlet bar 3 or suction bar 4 made of at least two such standard elements and an insertion head #as Fig. to exist.

In Fig. 13 is; strand such a standard element to be assigned to the suction strip 3 with the reference numeral 51 and shows in a perspective illustration the in FIG. 11 standard element shown in cross section. Each standard element has a closed suction chamber 47 and a connecting piece 48. The suction slot of the standard element 51 to be assigned to the suction bar 3 is denoted by 49, such a standard element can be exchanged as desired, not only within the suction bar 4, but also for a standard element of the inlet bar 3, if a »alternate suction is provided. For this purpose, connecting and guide elements 50 are loosened and the standard element 51 is removed from continuous steam lines 52. Guide and connecting elements 50 are mounted on the front side, which are adjustable and can be adapted to any type of corrugated cardboard; together with special sealing combs 54 and spacer and A fixed unit is formed by connecting elements 55. To readjust the sealing combs 54, this is released.

The standard elements 5Γ of the infeed bar 3, which are shown in the F i g. 12 and 14, form self-contained units that have their own cavities for the impregnating agent and compressed air.

Stabilizing, connecting and guiding elements 50, 55 and 56 together with steam lines 52 are provided for both standard elements 50 and 51 continuous and give the whole thing a stable unit when screwed together.

This is expediently stored on roller rails (not shown in particular) and adjusted to a slight snug fit with reference to the web of corrugated cardboard 2 by means of tension and compression springs. In this way, inlet strips 3 and suction strips 4 can easily adapt to any movement of the moving corrugated cardboard web. This ability of impregnating a high efficiency in each stage of the pres of the corrugated cardboard web fes secured.

Thanks to the separate suction and pressure chambers and the associated connections, it is possible that /. B.; on the suction side some elements of the suction bar 4 are connected to a vacuum pump, others are connected to a blower, so that variations can easily be made to adapt to the desired operating conditions. The same also applies with regard to the inlet strip 3 for the impregnating agent, the hot and cold compressed air. The reduction of the individual components, on the other hand, takes place by exchanging the various nozzles 53 according to FIG. 14 for ones of larger or smaller capacity. For this purpose, the adjusting screws of the front guide and connecting elements 50, 55 must be loosened and the latter must be moved up and down in adjusting slots (not shown) on the blocks 51 '. The nozzles 53, which can be screwed in and screwed out with Allen keys or slots, can be used to quickly replace nozzle sets.

Another possibility for regulating the impregnating agent is the use of a metering pump that is known per se and not shown. Both here and with the compressed air, the various can be opened

ίο Control the pressures acting on the impregnating agent.

At the two ends of the input and the suction side, bearings can advantageously be used above and below Recording of wetting rollers or sealing beads can be arranged, the waves of the latter be held rigidly only with one end in a storage, so that the other end slide in the opposite storage and thus can adapt to the movements of the impregnation device. The Fi g. 15 to 19 finally show from

ao homely Allen screws and therefore cost-saving nozzle arrangements, the nozzle of FIG. The nozzle shown in FIG. 15 is a Nozzle for introducing compressed air, it corresponds to that in

a5, the nozzle inserted into the standard element 51 'of FIG. 12, FIG. 16 does not have a longitudinal bore and can therefore be used where the inflow of a medium is not desired. It therefore serves as a sealing plug for nozzle bores and in these cases replaces the normal nozzle shown in FIG. 18 shows a nozzle for generating a liquid jet and FIG. 19 shows a pressure nozzle for injecting the impregnating agent in airless form.

A large number of substances can be used as impregnation

fen and materials are used, for example plastics, water glass, bitumen. Paraffins, resins, Glues, paraffin-bitumen emulsions, synthetic resin-wax mixtures, liquid plastics, foaming Plastics, synthetic resins, silicones, sodium silicate solutions solutions alkali metal silicates, vinyl resins, etc., where some then also serve as a filler.

In this context, the foaming of the corrugated ducts with a curable plastic foam is of particular importance, since in this way completely new stability and insulation conditions can be created even with corrugated cardboard. When foaming the corrugated cardboard with self-hardening Kunststoffschaurr, the foam, if it is composed of two or more components, is automatically and intensively mixed immediately prior to being introduced into the corrugated cardboard ducts, so that the foam enters the corrugated ducts in homogeneous liquid form. Corrugated cardboard foamed with plastic foam and embossed in embossed cardboard has, in addition to the gain in stability, an extraordinarily high insulation value and is particularly suitable for the transport of temperature-sensitive products, but also for use in the construction sector. The foaming of the corrugated cardboard kairile still enables di without loss of quality

6.1 Use of extremely large corrugated cardboard; Hen waves.

The corrugated cardboard can also be printed before it enters the impregnation device, the printing ink being used to penetrate the ItT

"J pi igniermitiels counteracts, so that a similar e ! Ect can be seen, as when applying a water film, a water color can possibly be used as the printing ink. Both this printing device a

the charging system can also use the impregnation device be assembled so that they form a single machine unit.

An even finer level than the spray is the evaporation of the impregnating agent and its subsequent Injection as steam. The vacuum evaporation takes on a special meaning here, because of it the vacuum the evaporation point is lowered. The impregnating agent can be used in a special provided vacuum containers are made to evaporate, with the steam in more or less compressed form is sucked into the shafts. The vapor impregnating agent can but can also be blown in at a temperature such that it is in the corrugated channels under vacuum additionally evaporated from a state of the finest nebulisation.

Depending on the requirements, the impregnating agent can be supplied in various forms, for example as a liquid, spray, vapor, powder, foam, ao mist, gas, dust, etc., the particles of the impregnating agent then each form a mixture with a gas and / or vaporous carrier medium. That Impregnation agent can be hot-melt or cold-melt Be a volatile agent, an emul- as sion or, as already mentioned, a foaming plastic.

The impregnation agent! can be meant as a spray with or without air - as it is assigned to it Nozzle comes - can be sprayed directly into the corrugated cardboard ducts, but it can also be sprayed in one if necessary heated compression chamber to a fine and moist mist and then through the corrugated channels are sucked through. The impregnating agent can be hot or cold in a vacuum chamber are sprayed in and vacuum evaporated and then from dies.er vacuum chamber as moist impregnating agent vapor are sucked through the catfish canals. It is finally possible to use the impregnating agent to put into a gaseous state by a carburetor and a sealing one when sucking through To trigger a reaction that binds paper fibers together.

Another possibility for impregnation is to dust the corrugated cardboard ducts with powder or Dust-like impregnation agents, which are similar to spray mist in a finely atomized state in the corrugated cardboard ducts the corrugated cardboard and there, be it through the moisture content of the corrugated cardboard pe. Temperature, dielectric polarization or by external mechanical influences for uniform Adhesion to the layers can be brought. The impregnating agents in powder form unfold their effect through the entrance of a connection with the components of the paper used (sodium) or by being melted down by the inherent heat of the corrugated cardboard or by specially supplied Hot air. Here, a powdery, water-soluble impregnating agent with the moisture of still fresh corrugated cardboard form a connection.

When using cold, aqueous plastic emulsions, it is advantageous to place the impregnation device over the last To attach heating plates of the drying section of the actual corrugated cardboard machine so that the Water containing emulsion can sufficiently volatilize on the further way. Finally can the impregnating agent and the corrugated cardboard impregnated by it or a part thereof for certain Purposes also brought into a dielectric state will.

Due to the extremely high speed that the spray mist reaches inside the corrugated cardboard ducts, can use the impregnation device as a short, high-performance unit between the short cross cutter 41 and in front of the triplex cut-crease station, which makes it possible to cut the corrugated cardboard to impregnate during the running production in their entire production width, as the for this necessary temperature of the corrugated cardboard is given here and then cut and / or creased. This has the great advantage that all corrugated channel openings are still open intact and the impregnating agent is not impaired as it flows through. Only after the impregnation is the corrugated cardboard processed by the cutting and creasing station, whereby the toilet channels are partially pushed in. The corrugated board is therefore in the area in which the impregnation is carried out, already finished, but still has a certain moisture content and above all a temperature (about 70 to 90 ° C) which is of considerable importance for the impregnation.

In addition 7 sheets of drawings

Claims (1)

Patent claims: 1. Process for impregnating corrugated cardboard running in the direction of the web, whereby both sides of it open channels extend in the transverse direction and optionally into these along a longitudinal edge an impregnating agent is introduced under the action of pressure, with appropriate action if necessary of an induced draft along the other longitudinal edge, thereby marked! that the corrugated cardboard web is continuously advanced in a horizontal plane and · η the channels the corrugated cardboard with the exclusive effect of suction on the opposite edge a mixture of particles of an impregnating agent and a gaseous and / or vaporous carrier medium is introduced. 2. The method according to claim 1, characterized in that that the impregnating agent is supplied airless under pressure and the carrier medium (air) mixed in when sucked into the Weüpappck canals will. 3. The method according to claim 1 or 2, characterized in that at least one outer The surface of the corrugated cardboard is sufficiently thick before the actual impregnation process Layer of a coating medium is applied in such a way that an outward migration the impregnation agent from the cannulas to the outer surfaces of the corrugated cardboard is prevented. 4. The method according to claim 3, characterized in that that a water film is used as the coating medium. 5. The method according to any one of claims 1 to 4, characterized in that the impregnating agent and / or the carrier medium is heated before being introduced into the corrugated cardboard ducts. b. Method according to one of claims I to 5, characterized in that the impregnating agent is evaporated before being introduced into the corrugated cardboard ducts, preferably vacuum evaporated. 7. The method according to any one of claims 1 to b. characterized in that the impregnating agent comprises a plurality of longitudinally to one another in Spaced feed areas is fed relative to the corrugated board and that the inflow of the Impregnation agent is regulated selectively for the individual areas. 8. The method according to claim 7, characterized in that that excess impregnating agent by means of different in the longitudinal direction to each other in Discharge areas held at a distance is discharged, the vacuum being set selectively in these areas will. SS 4. The method according to any one of claims 1 to 8, characterized by the fact that the impregnation agent a swirling twist crieili when it is supplied becomes, in such a way that the articles of the Inipraenicrmil IeIs by / en int ng a Ik ta I tw ffect against the inner walls the corrugated channels are thrown. 10. Seduction according to claim 1, characterized in that that a liquid waterproofing curtain and its atomization and removal into the corrugated cardboard ducts by fts emerging from nozzles Compressed air is achieved. 11. The method according to any one of claims 1 to 10. characterized in that after the mixture of impregnating agent and carrier medium has been introduced cold or hot air is metered into the corrugated cardboard ducts. 12. The method according to one or more of the claims 1 to 11, characterized in that with very large corrugated cardboard web widths from both sides is impregnated gradually up to about the middle of the corrugated cardboard web. 13. The method according to claim 12, characterized in that that the impregnating agent is staggered from both sides in zones arranged one after the other is let into the corrugated cardboard ducts under the action of an opposing suction zone and in each case the inflow zones for the impregnating agent from the suction zones through closure areas be separated. 14. The method according to any one of claims 1 to 13, characterized in that the corrugated cardboard channels are additionally evacuated through the cover layers will. 15. The method according to one or more of the claims 1 to 14, characterized in that before introducing the mixture of impregnating agent and carrier medium a vacuum is established on both sides of the corrugated cardboard ducts. 16. The method according to any one of claims 1 to 15, characterized in that the impregnating agent and the corrugated cardboard to be treated are dielectrically polarized state. 17. The method according to any one of claims 1 to Ib. characterized in that foamable plastic is used as the impregnation and / or filler will. 18. The method according to claim 17, characterized in that the components of the plastic are mixed with one another before being introduced into the corrugated cardboard ducts. I ⁴ ). Process according to one of Claims 1 to Ib, characterized in that an impregnating agent in powder, powder or dust form is used as the impregnating agent 20. The method according to one or more of claims 1 to 19, characterized in that at mchrwelliger corrugated cardboard at least one corrugation and the corresponding blankets are impregnated. 21. Device to * impregnate in the direction of the web running corrugated cardboard, the channels of which are open on both sides and extend in the transverse direction and in this along a longitudinal edge, optionally under the action of pressure, an impregnation medium can be brought in. possibly with a corresponding Effect of suction along the other longitudinal edge, preferably for implementation of the method according to one or more of claims I to 20, characterized in that that a device / Mi "continuous horizon talcn leadership de We'lnappe (2) with both sides The longitudinal edges of the corrugated cardboard (2) arranged infeed lcistc (3) or suction track (4) are provided is. that the middle of the suction bar (4) at the same time in a plurality of successive channels of the corrugated cardboard during their horizontal advancement oin Saiigzug can be produced. and that the squeegee (4) and Linlauileisle (3) extending in the horizontal direction and the associated corrugated cardboard box have receiving recesses (22, 23; 5). 21 Device according to claim 21. indicates that for the introduction of the impregnating agent in the inlet bar (J) nozzles (53) are provided, into which the feed pipe (58) for airless, pressurized introduction of the impregnating agent opens. 23. The device according to claim 2i. characterized in that for introducing the carrier medium and thus an annular channel concentrically surrounding the supply pipe to form the mixture (59) is provided. " 24. The device according to one or more of claims 21 to 23, characterized in that ' the infeed bar (3) has a plurality of feed areas that are spaced apart from one another in the longitudinal direction (8, 9. 10, 111) includes with Regeianordniingcn (15, Ib) to adjust the feed & .i impregnating agent and Air. 25. The device according to claim 24, characterized in that at least one additional feed area (10, 11) is disordered in the longitudinal direction. the hot compressed air and / or the cold compressed air Corrugated cardboard channels. 2 B. Device according to one or more of Claims 21 to 25, characterized in that the suction strip (4) likewise into a multiplicity of individual conjugate areas subdivided in the longitudinal direction is divided, with devices for setting up the Extent of the respective vacuum in the suction areas. 27. The device according to one or more of claims 21 to 2b, characterized in that Inlet bar (Ϊ) and suction bar (4) or ilen the l.trong edges of the corrugated cardboard receiving recesses (22. 23: 5) elastic sealing miuel (b. 28) are assigned to at least one of the horizontal / horizontal Grasp the outer surfaces of the corrugated cardboard (2). 28. The device according to one or more of claims 2t to 27. characterized in that the satellite strip (4) is assigned a suction box (32). via lines (3V- with a vacuum pump (34) in connection sieve, and that animal suction box ds fluid container and separator (suction box separator) is used for the impregnation agent, which can be fed back to the guide strip (3). 29. The device according to one or more of claims 21 to 28, characterized in that for atomizing a liquid curtain of impregnating agent through prel exiting nozzles (5Ϊ).! - IuIt is provided. 30. The device according to one or more of claims 21 to 29, characterized in that the impregnating agent can be introduced into the cardboard ducts from both sides in zones arranged one after the other under the action of an opposite suction area (4 ') with oak (40) fin ..Mn ·. · • \ htrennu; i; ^t and an adjoining Aiiskiihlur ;; > κί1 11. i ^ nüiii: duiYh compressed air 51. Device according to a change mehK rcn dei Claims 2! up to 30, thereby identified. that / in reduction of Oberllächu'italschiu '! <>! v-i and below the corrugated cardboard shields ge are appropriate for forced air. Ϊ2. Device after one or more dnr Claims 21 to 31, characterized in that you; Impregnation device / wipe the Kuiz tiucrschneider, where the necessary for ImpragP'ening Temperature of the corrugated board is given and the triplex cut-crease station the corrugated cardboard plant is arranged.