DE2124825A1 - Machine for coating paper sheets with liquid coating materials - Google Patents

Description

Applicant: Wilhelm Kumpf, 852 Erlangen, Am Anger 38,

Machine for coating sheets of paper with liquid application materials.

The invention relates to a machine for coating Sheets of paper and the like with liquid application materials, in particular gloss or colored varnish and adhesives, coating of paper sheets on their entire surface usually does not cause any major difficulties. You can do the job - similar to the application of paint on rotary machines - using a rubber roller system. This essentially consists of a scoop roller that is immersed in a supply of applicator and the application material with the mediation of a transfer or metering roller in the desired layer thickness to a third roller, which Applicator roller, supplies. This then coats the bow, which is passed between it and a counter roller.

A similar design is used as the counter roll, as is known in gravure printing machines under the designation "format cylinder" is. In the following it is called "format roller" because it also has a stretched rubber blanket with a flat one under it Insert is placed, which has the same format as the sheet to be coated. The resulting increased circulation for the Arch causes only this to be coated and the remaining part of the format roller remains free of application material.

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In contrast to gravure printing machines, however, "with this type of Coating machines between application roller and counter roller no pressure is exerted, because otherwise the · varnish ο »like to be coated. Film would be pinched off. Rather be the two rollers are only so close to each other that the application material from the application roller to the sheet only by slight Touch is transmitted. Soft rubbing of the application material is even beneficial. That is why the application roller and the counter roller are used driven with slightly different peripheral speed. Also between application, scoop and metering rollers no pressure is applied. They are only approached so far that the paint to be transferred or the like. Film the one you want Thickness gets. As none of the four rollers have any particular stability requirements is subject to, they can simply be made from lightweight metal cylinders that are used in the order, the The dosing roller and the scoop roller have ground rubber pads. The circumference of the rubber application roller is also for reasons of a more even distribution of the layer to be coated on the sheet Application material smaller than the sheet length respectively. the circumference of the format roller.

paint or the like, application machines of this type for coating Arches over their entire area are known. They have proven themselves and can be produced with so little effort that their use, although they are only used as auxiliary machines Subsequent surface refinement with low utility value in relation to printing machines serve, economically is.

In many cases, however, in addition to a coating of paper or the like. Sheets with liquid application materials on their entire surface are also required to only partially ^: coat them on predetermined surfaces, so that, for example, when used for packaging purposes, after the application of colored or glossy varnish, the areas intended for an adhesive to be applied later remain varnish-free and thus adherent. Besides, it's for reasons

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The saving of application material, ζ.B ₀ of paint, is also an advantage if only the later visible surfaces are coated, as is the case, for example, with folding packs, where large parts of the paper surface are often covered.

In the printing trade, partial surface coloring of the sheet is already known in color printing. For this purpose, gravure printing machines are used in which the application cylinder has a gravure screen corresponding to the areas to be colored. Abundant paint is applied to this, after which a squeegee removes any excess paint. The color remaining in the depressions of the grid is then transferred to the sheet by applying high pressure. Gravure printing machines of this type are extensive and expensive rotary machines for printing pictures in magazines, books, etc. They are used to partially coat sheets only for the purpose of giving their mostly already printed surface, e.g. by applying glossy varnish, a more effective appearance, or Applying glue to them in certain places would be completely uneconomical. Rather, machines for fulfilling the last-mentioned task can only handle a fraction of the acquisition costs of gravure printing machines in order to be economical _{or similar}

Attempts have also been made to solve the problem of partial surface coating to be solved with cliché rollers, in which the surfaces to be coated - similar to the printing blocks in the letterpress process - are raised were executed. However, there were difficulties in distributing the material to be applied, especially at the edges of the cliché.

The invention is based on the known one described at the beginning

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Machine with the rubber roller system for coating the entire Arched flat and allows it to be inserted into a machine for sheet coating ^, only on predetermined surfaces to convert. A second independent machine is thus superfluous

The invention consists in that for the conversion of the Machine for full-surface coating on partial arc coating the smooth, smaller diameter on predetermined partial surfaces as the form roller having the format roller together with special bearing supports from the machine that are guided in bearing blocks "Removable and by means of an anilox roller with the to be coated Arch surfaces can be replaced according to arranged Easter surfaces, the anilox roller having the same peripheral speed and the same Diameter like the format roller as well as its own, its larger diameter knife has adapted, higher bearing brackets, which are placed in the guides of the bearing blocks, that also a to the anilox roller adjacent squeegee can be placed on existing fastening means, and that also the format roller for the gravure printing process required high rolling pressures is dimensioned "

Since the circumference of the smooth (rubber roller for the full-surface Coating for reasons of the more even distribution of the application material to be coated on the sheet is smaller than that Arc length or the extent of the »., the metering roller must be reset when the company is changed. For this Basically, according to the further invention, the contract that is shown in A method known per se from at least one in an order material supply immersed scoop roller and from one of the application material taking over from this and in the desired layer thickness

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the metering roller transferring the applicator roller together with its setting means "consists, on a special frame part to form a structural unit, which corresponds to the different diameter the applicator rollers used in the machine can be moved forward and backward *

Further advantageous features of the invention emerge from the following description of exemplary embodiments, which are based on the Drawing are shown in their essential parts schematically in side view. Show it

Fig.1 shows a machine for coating sheets on their surfaces

entire surface with a rubber roller, FIG. 2 a machine for the partial coating of sheets on predetermined areas,

3 shows the coating machine according to FIG tempo bow boom.

In the coating machine according to Figure 1, 1 is a roller with sanded G-ummia pad. She's got the job between her and its counter roller 2 to coat sheets passed through from right to left with application material. The applicator roller 1 receives the application material from a transfer mechanism 3 »its essential parts a scoop roller 4, a metering roller 5 and a storage container 6 for the application material. The scoop roller 4 dips into the application material supply and transfers part of the scooped substance to the metering roller 5, which then gives it the desired layer thickness transfers to the applicator roller. The roller spacing and thickness of the scoop roller 4 to the metering roller can be adjusted by adjusting means 7, 8 5 and the thickness of the application material layer transferred from this to the application roller 1 meet the requirements be adjusted.

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The counter roller is designed as a format roller. There's a rubber blanket on top of it. 9 stretched, under the one the format of the to be coated Sheet of the same size insert is placed in order to create a slightly increased edition for the sheet. This makes him iron the Coating application roller 1 alone, while the remaining area of the format roller 2 remains free of application material.

The respective assignment of the individual sheets to the format insert 9 takes place by a conventional, circulating on a closed track gripper arrangement, which the same speed as the

) The peripheral speed of the format roller 2 has. It consists of two arranged on the end faces of the format roller 2 and driven by this chains 10, between which in the same, the circumference the format roller 2 corresponding intervals gripper groups are arranged on cross members. The not shown grippers grasp the individual sheet in front of the machine infeed, pull it between the two rollers 1 and 2, whereby they move into the Lay the longitudinal recess 11 'of the format cylinder 2 and transport to the vicinity of the some distance on each boom

^ frame 12 bearing guide wheel pair 13 »where it is delivered.

Form roller 1 and format roller 2 are not under mutual pressure, but are to be set to such a distance that the The layer to be applied is given the desired thickness. This is the format roller 2 is finely adjustable in height, as in Figo2 and is indicated for example by the eccentric bearing 15 rotatable by a worm drive 14 for the axis 16 of the format roller 2 «

The application roller has a noticeably smaller diameter than the format roller 2. It has been shown that the even-

speed of the applicator layer applied to the applicator roller 1

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on their way to contact with the bow at higher speeds is disturbed, when the roll diameter is a certain Size exceeds. Application roller 1 and format roller 2 also have slightly different circumferential speed, so that the application material is rubbed gently during the coating.

Around the machine iur coating of the entire arch surface 1 to convert according to the invention to coating one or more partial surfaces of the sheet, the smooth application roller replaced by an anilox roller, which has the same diameter and is driven at the same peripheral speed like the format roller 2. In order to facilitate the removal and installation, the application roller 1 is mounted in special bearing supports 17 which are guided in recesses 18 of bearing blocks 19 and screwed onto these.

As can be seen from Figo 2, in the same reference numerals as Referring to the same parts in FIG. 1, the anilox roller 20 to be placed in place of the smooth application roller 1 (FIG. 1) also has their own bearing brackets 21. These are higher than the bearing brackets 17 in accordance with the larger diameter of the anilox roller 20 1, but also fit into the recesses 18 of the bearing blocks 19 »You can use the same G-thread holes again for screwing to be used.

The position of the metering roller 5 must be adapted to the larger diameter of the anilox roller 20. In order to simplify this, it is advantageous to combine the transfer machine 3, which essentially consists of the scoop roller 4, metering roller together with setting means 7, 8 and storage container 6, into a structural unit

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l is fastened by screws 23 on its base. To this Way, after loosening these screws 23, the entire multi-part transmission mechanism 3 can be reset all at once by a corresponding amount, which is determined by threaded bores 24 in which now the screws 23 can be set.

The anilox roller 20 has, directly on its surface or on a metal plate placed on the subject, which correspond to the partial surfaces of the sheet to be coated, a grid in the manner of the grid in the gravure printing process. To benefit from the order substance, f applied from the metering roller 5 on the entire surface of the screen roller, the excess portion outside the grid dimples to be removed again, is used a doctor blade 25, which is placed together with its support to existing fastener 26th In the simplest case, the latter can only be threaded holes for fastening screws.

While with the equipment of the machine for exclusively full-surface sheet coating by means of a rubber application roller the

. Format roller is known to be "unloaded and therefore in a corresponding .. "Lighter construction can be produced, it must be equipped with the equipment the machine according to Fig.2 press the sheet with high pressure on the anilox roller, as required in the gravure printing process is. The format roller 2 is therefore dimensioned from the outset for such high pressures and also remains with the sheet coating over the entire surface with the rubber applicator roller 1 (Fig. 1) in the machine «,

Around the well-known machine for full-surface sheet coating To change over to partial surface coating by means of a rubber applicator roller according to the invention are therefore relatively easy except for a few

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The precautions to be taken on the machine itself are only practical an anilox roller and a squeegee "are also required, i.e. an effort that is disproportionate to the effort that the Production of a second machine.

The conversion itself does not cause any difficulties either and can be carried out in a short time. A considerable one This can be made easier by the fact that, as shown in FIG is made. For this purpose, the boom frame 12, the consists essentially of two side parts connected to one another at suitable points, coaxial to the axis of the format roller 2 be mounted on this itself or on the machine frame 27 and located in the Pig. 1 and 2 shown working position Support existing supports on the machine frame 27. By advantageously acting on both boom halves: lifting devices, For example, hydraulic lifting devices 28, the boom 12 can be pivoted up. So that the applicator roller 20 or 1; (Fig »i) is not a hindrance, it can be pushed forward. For this purpose, the lagerblöoke 19 can be extended be, the transfer mechanism-bearing part 22 take up uncials carriage 30, the. on the machine frame 27 ι or guided on a special rail ieVfc Two coupling rods 29 are on the one hand on the side parts of the boom 12 and on the other hand articulated to the carriage 30 such that when the boom 12 is raised, the carriage 30 with your ι The superstructure is pushed forward. The boom swung up

12 / unhindered access to the outlet side of the machine frqi. for inserting and aligning the inserts of the format roller 2, cleaning the rollers, replacing the applicator rollers 1, 20, ' au monitoring and repair work, etc.

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Claims (4)

- ίο - Claims. ./Machine for coating paper and the like. Sheets with liquid coating materials, "in which the sheets are used for coating on its entire surface between a smooth application roller and one preferably with a different peripheral speed driven and a larger diameter format roller are passed without pressure, wherein a metering roller transfers the application material from one to an application material supply immersing scoop roller takes over and transfers in the desired layer thickness to the application roller, characterized in that for a partial sheet inspection on predetermined the smooth application roller (1) together with special in bearing blocks (19) guided bearing supports (17) from the machine removable and replaceable by a baster roller (20) with grid areas corresponding to the sheet areas to be coated, wherein the anilox roller (20) has the same peripheral speed and the same diameter as the format roller (2) and its own, its larger one Has a higher bearing bracket (21) adapted to the diameter, which is placed in the bearing blocks (19), and which is also attached to the Anilox roller (20) adjacent doctor blade (25) can be placed on existing fastening means (26), and that, in addition, the format roller (2) is dimensioned for the high roller pressures required in the gravure printing process. 2. Machine according to claim 1, characterized in that the transmission mechanism (3), which in a manner known per se is essentially the end. a scoop roller immersed in an application material supply and one which takes over the application material from this and is in the ? 098Α9 / 0048 transferring the desired layer thickness to the applicator roller (1,20) Dosierwaise (5) together with setting means (7,8) consists on one special frame part (22) is combined into a structural unit, which corresponds to the different diameter of the in the application rollers (1, 20) that can be used in the machine can be advanced and reset by a predetermined amount 3 ο machine according to claim 1, in which for sheet transport between Application roller and format roller serve two endless chains with gripper groups arranged in between, the chains on the one hand over the same axis as the format roller and on the other hand over on the sheet outlet side at some distance Chain wheels are guided, characterized in that the outlet side Pair of sprockets (13) from a cantilever frame (12) around
is carried, the / arranged to the format roller (2) Bearing can be swiveled up. 4. Machine according to claim 1 and 2, characterized in that the bearing blocks (19) for the applicator rollers (1,20) and the structural unit (3) and the fastening means (26) for the doctor blade (25) are arranged on a carriage (30) which is on the machine frame (27) can be moved lengthways 5ο machine according to claim 3 and 4, characterized in that the boom frame (12) is connected to the carriage (30) by articulated push rods (29) in such a way that when it is lifted of the boom frame (12) the carriage with the parts arranged on it is pushed back out of the working position and when lowering returns to work. 209849/0048