EP3461638A1 - Apparatus for drying printed material provided with printing ink - Google Patents

Abstract

The invention relates to a device (1) for drying a printing material (5) provided with printing ink in a printing press (2) with a hollow body (10) having an elongated air guide region (20) with an opening (21) around a gaseous medium from the hollow body (10) in the direction of the printing material, to guide a feed opening (11) to the gaseous medium in the hollow body (10).

According to the invention, it is provided that the hollow body (10) and the air-guiding region (20) form a common, material-uniform component.

Description

The invention relates to a device according to the preamble of claim 1.

It is known from the prior art that blower units are used, which are usually components of dryers to dry freshly printed substrate. For example, to the substrate with heated air is applied, so that the solvent present in the still wet ink is accelerated evaporation. A printing press can be equipped with a large number of such dryers, wherein at least one such dryer is located behind each printing unit in the transport direction of the printing material.

The DE 10 2004 051 990 B4 shows an apparatus for drying an inked substrate, wherein the device, a gaseous medium is supplied via a connection piece. This gaseous medium then exits through openings from this device. The known device consists essentially of four components. In detail, these are a hollow body, a connecting piece, a cover and a hole or nozzle bar from which the gaseous medium leaves the device in the direction of printing material. The known device is characterized by the fact that good flow conditions, in particular when leaving the device are created, whereby an efficient drying of the printing material can be achieved. It has been found that the production method or the production costs of such a device can be further optimized.

It is therefore an object of the present invention to at least partially overcome the disadvantages described above. In particular, it is an object of the present invention to provide a device which is less expensive to manufacture.

The above object is achieved by an apparatus having the features of claim 1. Further features and details of the invention will become apparent from the respective dependent claims, the description and the drawings. In this case, features and details that are described in connection with the claims according to the invention apply, of course, also in connection with the device according to the invention, and in each case vice versa, so that with respect to the disclosure of the individual aspects of the invention always reciprocal reference is or can be.

The object is achieved in particular by a device for drying a printing material provided with a printing machine with a hollow body having an elongated air guide region with an opening to direct a gaseous medium from the hollow body in the direction of the substrate, and a feed opening to direct the gaseous medium into the hollow body. In this case, it is provided that the hollow body and the air guide area form a common, material-uniform component. According to the gaseous medium passes through the opening of the hollow body in the device, wherein within the hollow body, the gaseous medium enters the air duct area to as evenly as possible from the Leave air duct area and to flow on the substrate. It is particularly advantageous that the hollow body and the air guide area are made of a component, whereby the manufacturing costs can be significantly reduced. In a few steps can thus produce the device of the invention. The elongated extension of the hollow body advantageously corresponds to the elongate extension of the air-guiding region, so that the printing substrate can be completely dried by the device according to the invention. Advantageously, the air guide region adjoins directly on the hollow body, wherein the air guide region can be designed nozzle-shaped, so that the gaseous medium can reliably leave the device according to the invention in the direction of printing material from an opening of the air guide region. The printing machine may be, for example, a flexographic printing machine or a gravure printing machine.

It can also be provided that the air guide region has two walls which are at least partially spaced from each other, wherein in particular the walls at least partially contact each other. The walls form on the one hand a flow channel for the gaseous medium, wherein both walls are arranged opposite each other. During operation, the gaseous medium leaves the hollow body in the direction of the air-guiding region in which it flows along the walls in the direction of the printing material. The walls are open on the opposite side of the hollow body, whereby the opening of the air duct is formed. Advantageously, the walls are connected to each other at defined locations or fastened together. Thus, a stable air guide area is formed, which provides a uniform flow and a uniform opening of the air guide area for the gaseous leaking medium.

In addition, it may be advantageous in the context of the invention for the air guidance area to have air resistance elements at least on one of the two walls. On the one hand, the air resistance element serves to achieve an optimum flow within the hollow body and / or in the air guide region, so that an optimal fluid outlet in the direction of the printing material can be achieved. This serves to dry the substrate as efficiently as possible.

In addition, it may be advantageous in the context of the invention that the air resistance element has an elongated extension which is aligned in the direction of the opening of the air guide region. It has been shown that the elongated extension causes an advantageous equalization of the medium flow at the outlet of the opening of the air guide region, while at the same time the pressure losses within the device are kept low.

According to an advantageous development of the invention, it can be provided that the air guide region has near its opening a mouth portion in which there is no air resistance element. The advantage of the mouth section is that the flow of the medium, which is passed through the air guide region, in the mouth section recovers, whereby a homogenization on the exit of the medium to the printing material is achieved. Advantageously, the mouth portion extends along the entire extension length of the hollow body.

According to an advantageous development of the invention, it can be provided that the walls have a distance X from one another, which is in particular between 1 mm ≦ X ≦ 10 mm. The distance X is advantageously constant over the entire extent of the air guide area. Advantageously, the distance X is in a range between 1mm ≦ X ≦ 5mm.

It is also advantageous if, in the context of the invention, the air guide region has a length Lw starting from the hollow body to the opening of the air guide region, wherein the mouth portion has a length Lm extending from the air resistance element to the opening of the air guide region, wherein 1.5 ≤ Lw / Lm ≤ 10, in particular 2 ≤ Lw / Lm ≤ 5. According to the invention, it has been shown that the length of the mouth section is important in order to achieve a fluidic calming which is advantageous for the drying effect on the printing material. Compared to the length of the air guide area, the length of the mouth section is to be selected substantially smaller in order to achieve a homogenization of the flow. Thus, the smallest possible overall arrangement can be created.

In addition, it is advantageous if in the context of the invention, the air resistance element has a contact zone which is fixed to the adjacent wall. It has been found according to the invention that only defined contact zones are necessary in order to reliably secure both walls together without the stability of the device according to the invention being jeopardized during operation. The fewer contact zones are present, the less are the flow resistances in the device according to the invention.

In addition, it is advantageous if within the scope of the invention a multiplicity of air resistance elements are provided which have a distance Y from one another, in which 0.01 ≦ X / Y ≦ 0.3, in particular 0.03 ≦ X / Y ≦ 0 , 08 is. The distance X of the opening of the air guide region, which may also be referred to as a nozzle gap, may vary corresponding to the distance Y, wherein the distance Y is the distance between two air resistance elements. The distances between the air resistance elements must not be too low, since otherwise larger pressure losses occur within the device. Too large a distance Y is also disadvantageous since the air resistance elements serve as fastening means via the contact zone. Too small a number of Kotaktzonen could cause a possible instability of the device according to the invention during operation, which means that, for example, due to the prevailing medium flow in the air duct area it could come to unnecessary turbulence or material vibrations.

Advantageously, it can be provided within the scope of the invention that both walls have air resistance elements which are connected and / or fixed to one another at their contact zones. It may be advantageous to provide both opposing walls with air resistance elements, whereby a stable air flow area is provided and a uniform flow is achieved within the device according to the invention. Advantageously, the geometries of the air resistance elements are identical on both walls. The air resistance elements are located within the air guide area, that means inside the respective wall.

Advantageously, it can be provided within the scope of the invention that the hollow body and the air guide area form a common metal part, in particular stamped and bent part. This has the advantage that the device according to the invention can be formed inexpensively. In this case, the metal part forms a certain stability, which is necessary in order to guide the medium flow present within the hollow body as well as the air guide region uniformly and reliably out of the nozzle gap in the direction of the printing material. The stamped and bent part is to be realized in a few simple manufacturing steps, wherein the attachment of defined areas of the metal part takes place at the air guide area.

At least one side of the hollow body is closed by a cover element. The side opposite the cover element has at least one corresponding feed opening in order to guide the gaseous medium into the hollow body. The lid member is advantageously a separate component to the hollow body and the air duct area. The cover element may be positively and / or positively and / or materially secured to the hollow body, in particular the cover element is screwed to the hollow body. A locking connection, such as Verklipsung etc., is alternatively and / or additionally conceivable. In addition, it is also advantageously provided in the context of the invention that the feed opening also has a cover element, wherein this cover element has a flow opening through which the gaseous medium can be conducted into the hollow body from outside. This lid member may be fixed in an identical manner as the opposite lid member on the hollow body.

According to an advantageous embodiment of the invention can be provided that the air resistance element is formed from the metal part, in particular deep-drawn or embossed. Such a configuration is characterized by low production costs, wherein in particular the forming process can be carried out in a short production time and the reproducibility of the deformation result is very high.
According to an advantageous embodiment of the invention can be provided that the walls are parallel to each other or the walls are conical to each other, wherein the distance X is smaller towards the opening. Depending on the installation conditions, it may be useful for the walls to taper conically, resulting in a nozzle effect of a confuser. Due to the tapering cross section in the Konfusor increases the flow velocity of the medium. This can have an effect on the drying process on the substrate.

According to an advantageous embodiment of the invention can be provided that the air resistance element has a depth T, which is substantially uniform. This inventive design can be realized, for example, when the walls are parallel to each other, wherein the air resistance elements serve as spacers between the walls. The depth T substantially affects the distance X between the walls or the opening of the air guide area where the medium exits.

Further advantage may be provided that the air resistance element has a depth T, which decreases to the opening of the air ducting area. Such a construction may be useful if the walls, for example, run conically to each other, wherein the distance X to the opening is smaller. In this case, it is also conceivable that only one wall is provided with air resistance elements or both walls each have air resistance elements, the air resistance elements of one wall being fastened to the opposing air resistance elements of the other wall, in particular at the contact zones.

A further advantage may be that the contact zone of the air resistance element of the one wall is substantially parallel to the opposite wall or the contact zone of the air resistance element of one wall is substantially parallel to the contact zone of the opposing air resistance element of the other wall. This means that either the device according to the invention has air resistance elements on each wall or, in a possible variant, has air resistance elements on a wall, the opposite wall being free of air resistance elements. In both cases, both walls are fastened via the air resistance elements.

It may be advantageous if in the context of the invention, the two walls are positively and / or non-positively and / or materially connected, in particular that the two walls are welded or clinched. The two The latter types of fastening are characterized in particular by their reliability, which means that they are durable fastening effects, even when higher flow velocities prevail in the air ducting area.

It can be advantageous that the air resistance elements of one wall are fastened to the opposite other wall or the air resistance elements of one wall are fastened to the air resistance elements of the other wall. The attachment takes place in each case at the contact zone of each air resistance element, wherein the contact zone can accommodate different geometric shapes, such as a circular or oval shape.

In a further possibility it can be provided that a fixing region of the contact zone of one wall serves for fastening to the other wall. Advantageously, the fixing region is geometrically smaller than the contact zone. Particularly in the case of welding or clinching, the fixing region can be made substantially smaller than the actual contact zone. However, this also means that the remaining area of the contact zone can continue to rest on the opposite wall.

In a further possibility, it can be provided that the fixing region is arranged on the side of the air-guiding region facing the hollow body. This makes it possible to achieve an increased fastening effect between the walls. Another advantage is that despite higher flow velocities within the air duct area, the noise can be kept low. Surprisingly, in flow tests, this last-mentioned phenomenon has revealed that as a result of an arrangement of the fixing region as close as possible to the hollow body, the flow is reliably conducted between the air resistance elements and no unnecessary turbulence in the area of the air resistance elements arises, which has a positive effect on the noise reduction.

It may be advantageous if, in the context of the invention, the air resistance element tapers in the direction of the opening. This means that the distance between two adjacent air resistance elements of a wall can increase. This arrangement resembles a diffuser-type nozzle. This embodiment can be combined with a constantly present distance X between the walls or with a decreasing distance X in the direction of the opening of the air guide area. Both latter alternative embodiments cause uniform flow conditions at the outlet of the device according to the invention, where the medium leaves the air guidance area.

It may be advantageous if in the context of the invention, the air resistance element is drop-shaped or circular or oval or the width of the air resistance element is almost constant along its extension in the direction of opening. Such forms of an air resistance element can be easily realized by a forming process on the metal part. The metal part, from which the hollow body as well as the air guide area is executed, is advantageously before the forming process a flat metal part or sheet metal, wherein it advantageously has a rectangular shape. In a first method step, forming takes place at defined regions of the metal in order to introduce the air resistance elements into the metal. Subsequently, the metal part is bent at defined locations, which takes place for example via a roll profiling. In a further step, an attachment to the air duct area, advantageously via a weld or via a clinch.

According to the invention, it can be provided that at least one wall has a first and a second air resistance element, the first air resistance element being geometrically different from the second air resistance element, in particular the first air resistance element generating a greater air resistance for the gaseous medium than the second air resistance element. The different design of the geometries has the advantage that good drying effects can be achieved on the substrate, in particular a uniform drying can be achieved. There is no "strip drying" across the width of the substrate.

In addition, it can be provided that the first air resistance element has the fixing region. In general, the first air resistance element has a larger structural structure than the second air resistance element, so that a reliable fixation can be achieved.

The invention may also include that the air resistance elements of the one wall are arranged offset from the air resistance elements of the opposite wall, wherein in particular the air resistance elements are positioned in the air guide region at a common height. Thus, it is conceivable that each wall has a certain number of air resistance elements, wherein advantageously the fixing region is present on the first air resistance element.

It has been found that good drying results can be achieved if the offset is 50% of the distance Y between two adjacent air resistance elements of a wall.

According to the invention, the device may be designed such that the hollow body has an opening which is positioned opposite to the feed opening, wherein at the opening and / or at the feed opening a lid member is fixed, so that the hollow body is closed, in particular the lid member form - And / or non-positively and / or materially attached to the hollow body. The lid member may be formed as an injection molded part. Advantageously, the cover element is made of a plastic. The plastic advantageously has an increased electrical conductivity, so that an electrical charge during the drying process can be avoided by the device according to the invention. For example, the lid member is formed of a high temperature resistant thermoplastic such as polyphenylene sulfide (PPS).

According to the invention, it may be provided that the cover element has a double-walled fastening section into which the hollow body extends, the hollow body being encompassed by the fastening section. The double-walled attachment portion is open to one side, so that the hollow body can protrude into this attachment portion, which is advantageous for assembly.

In addition, it is conceivable that the attachment portion has an inner portion and an outer portion, wherein between the inner portion and the outer portion is a free space into which the hollow body extends. Advantageously, the free space in its dimensions is greater than the wall thickness of Hollow body, so that reliable and without complications of the hollow body can be guided in the free space.

The device according to the invention can provide that fastening elements are provided in the fastening section, which are at the same time in operative connection with the fastening section and with the hollow body. The fastener advantageously acts fastened on the inside of the hollow body and at the same time in the double-walled attachment portion of the cover element.

In order to achieve a greater fastening effect of the cover element on the hollow body, it can be provided that the inner section and / or the outer section have at least one projection which projects into the free space. The projection is advantageously made of the same material and / or monolithic to the cover element. In the assembled state, the projection exerts an additional holding force on the hollow body.

According to the invention it can be provided that a flow element is arranged within the hollow body, which allows to direct the gaseous medium within the hollow body in the direction of the opening, wherein in particular the flow element has a penetration depth into the hollow body, which is less than 10% of the total width of the Hollow body, wherein the total width is determined by the distance between the feed opening and the opening of the hollow body. The flow element allows a uniform distribution of the gaseous medium within the hollow body. In particular, the gaseous medium, which flows into the hollow body, forced to flow even at the beginning of the opening along the air resistance elements to leave there the hollow body for reliable drying of the printing material over its entire width.

Advantageously, the cover element may comprise the flow element. Advantageously, the flow element with the cover element forms a material-uniform and / or monolithic component.

Advantageously, the air guide region has a plurality of air resistance elements, which are arranged along the width of the hollow body. It is conceivable that the Air guiding areas have the same geometric shape. It is also possible that both a plurality of first air resistance elements and second air resistance elements are arranged, which may be provided side by side in different variations. For example, alternately a first air resistance element and then a second air resistance element and then again a first air resistance element, etc. may be provided. Also, the combination is possible that first the second air resistance element and then the first air resistance element and then the second air resistance element, etc., may be provided. Other conceivable combinations that also give rise to a certain irregularity are also possible. For example, two first air resistance elements followed by three second air resistance elements and followed by a first air resistance element etc. may be used. It has been shown in all the conceivable combinations that this strip stripping can be effectively avoided.

In addition, the invention is achieved by a printing machine having a plurality of inking units, wherein the drying unit has a plurality of devices according to the invention. Here are all, executed embodiments of the device according to the invention, which are already described, related to the printing press.

Advantageously, the drying unit has a plurality of devices according to the invention for drying the printing material. It can be provided that the air resistance elements of the hollow body are arranged offset to the air resistance elements of the adjacent hollow body. In this case, an offset can be provided, which is for example 50% of the distance Y, wherein the distance Y is the distance between two adjacent air resistance elements within a hollow body. As a result, a strip drying can also be avoided. The offset can also be dimensioned differently, for. B. Y: 4 or Y: 3.

Advantageously, the printing machine can be designed such that the drying unit has a plurality of guide rollers, wherein each guide roller is associated with a device, wherein the drying unit has an input through which the substrate is feasible in the drying unit, and an output through which the substrate the drying unit leaves, in particular that each opening of the device is aligned with the axis of rotation of the guide roller, wherein the openings of the devices, which have the smallest distance to the exit and the entrance, are aligned with the adjacent guide roller. The different orientation of the arranged at the edge, inventive devices has the advantage that as little solvent can leave the drying unit through the entrance or the exit. According to the invention, it is provided that a separate solvent removal is provided. The arranged on the edge devices cause a flow direction of the gaseous medium, which is opposite to the input or the output aligned. Thus, the intention is that the solvent located within the hollow body can not flow in the direction of the outlet or inlet.

Fig. 1

ein mögliches Ausführungsbeispiel einer Vorrichtung zum Trocknen eines mit Druckfarbe versehenen Bedruckstoffes in einer Druckmaschine,

Fig. 2

eine weitere Ausführungsform einer erfindungsgemäßen Vorrichtung gemäß Figur 1,

Fig. 3

eine weitere Ausgestaltungsform einer erfindungsgemäßen Vorrichtung gemäß Figur 1,

Fig. 4

die Ausführungsform gemäß Figur 1 in einem weiteren Ausführungsbeispiel,

Fig. 5

ein weiteres Ausführungsbeispiel einer in Figur 1 dargestellten Vorrichtung und

Fig. 6

ein weiteres Beispiel einer Vorrichtung gemäß Figur 1,

Fig. 7

eine Ausführungsform einer Vorrichtung gemäß der Figuren 1 bis 6 sowie der Figuren 8 bis 15, die für eine Druckmaschine vorgesehen ist,

Fig. 8

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung gemäß Figur 1,

Fig. 9

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung gemäß Figur 1 mit einem Deckelelement,

Fig. 10

das Ausführungsbeispiel gemäß Figur 9, wobei das Deckelelement am Hohlkörper der Vorrichtung befestigt ist,

Fig. 11

ein weiteres Ausführungsbeispiel der erfindungsgemäßen Vorrichtung mit Deckelelement,

Fig. 12

das Ausführungsbeispiel gemäß Figur 11 in einer weiteren Ansicht,

Fig. 13

ein weiteres Ausführungsbeispiel eines Deckelelementes für eine Vorrichtung gemäß Figur 1,

Fig. 14

ein weiteres Ausführungsbeispiel eines Deckelelementes für eine erfindungsgemäße Vorrichtung gemäß Figur 1,

Fig. 15

eine vergrößerte Darstellung der Öffnung des Luftführungsbereichs des Hohlkörpers.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, embodiments of the invention are described in detail. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination. Show it:

Fig. 1

A possible embodiment of an apparatus for drying a printing substrate provided with ink in a printing press,

Fig. 2

a further embodiment of a device according to the invention according to FIG. 1 .

Fig. 3

a further embodiment of a device according to the invention according to FIG. 1 .

Fig. 4

the embodiment according to FIG. 1 in a further embodiment,

Fig. 5

a further embodiment of an in FIG. 1 illustrated device and

Fig. 6

another example of a device according to FIG. 1 .

Fig. 7

an embodiment of a device according to the FIGS. 1 to 6 as well as the FIGS. 8 to 15 which is intended for a printing press,

Fig. 8

a further embodiment of a device according to the invention according to FIG. 1 .

Fig. 9

a further embodiment of a device according to the invention according to FIG. 1 with a cover element,

Fig. 10

the embodiment according to FIG. 9 wherein the cover element is attached to the hollow body of the device,

Fig. 11

a further embodiment of the device according to the invention with cover element,

Fig. 12

the embodiment according to FIG. 11 in another view,

Fig. 13

a further embodiment of a cover element for a device according to FIG. 1 .

Fig. 14

a further embodiment of a cover element for a device according to the invention according to FIG. 1 .

Fig. 15

an enlarged view of the opening of the air guide portion of the hollow body.

FIG. 1 shows a device 1 for drying a substrate provided with a printing ink in a printing machine 2. The printing machine 2 is shown purely schematically, wherein the printing substrate with ink in the embodiments shown is not explicitly shown. In the printing machine 2, it may be z. Example, to act as a gravure printing machine or a flexographic printing press, in which the inventive device 1, which can also be referred to as a blower unit, a gaseous medium flow in the direction of printing material. Advantageously, heated air is used as gaseous medium used to increase the efficiency of drying. As a medium z. As air or other suitable gases find their use. The device 1 according to the invention is preferably connected to a line system 3 which directs the gaseous medium into a hollow body 10 of the device 1 according to the invention. Among other things, the device 1 serves to distribute the fed-in medium uniformly over the entire width B of the hollow body, so that the printing material can be dried uniformly in its entire width.

The hollow body 10 has at one of its end faces a feed opening 11 to which the line system 3 can be connected in order to efficiently flow the gaseous medium into the hollow body 10. On the opposite end side, a cover element 14 is arranged, which is exemplified in FIG. 2 or FIG. 3 as well as in the FIGS. 10 to 12 is shown. This lid member 14 closes the hollow body 10, and its opening 13. The hollow body 10 of the device 1 according to the invention shown can have any cross-section. The hollow body 10 serves as an air-conducting channel, wherein the hollow body 10, an air guide portion 20 is carried out, through which the gaseous medium can flow. The air guide region 20 has along its elongate extent a common opening 21, which is also in FIG. 2 and FIG. 3 is shown. Through this opening 21, the gaseous medium can leave the device 1 according to the invention in the direction of the printing material. The feed opening 11 can also be closed by a cover element 12, which will be discussed in more detail below.

The air guide region 20 and the hollow body 10 form a common material-unitary component, which is shown in all embodiments. In the common component, this is a metal part, which among other things temperature resistant. The material may be, for example, steel or sheet, which z. B. may have a thickness of 0.3mm to 0.9mm.

The device 1 according to the invention has in the air guide region 20 two walls 22, 24, which are spaced from each other. In all embodiments, the wall 22 on a plurality of air resistance elements 23. According to FIG. 2 the resistance elements 23 are found only on the wall 22, wherein the opposite wall 24 is executed without the air resistance elements. As well in FIG. 2 as well as in the following embodiments FIG. 12 the air resistance elements 23, 25 on an elongated extension, which are aligned in the direction of the opening 21 of the air guide portion 20. All embodiments show that the air guide region 20 near its opening 21 has a mouth portion 26 in which no air resistance element 23, 25 is located. The walls 22, 24 have a distance X to each other, which is advantageously between 1mm ≤ X ≤ 10mm. In FIG. 2 the walls 22, 24 are parallel to each other. According to FIG. 3 on the other hand, the walls 22, 24 taper conically with each other, whereby the distance X towards the opening 21 becomes smaller.
The air guide region 20 has according to FIG. 2 to FIG. 3 a length Lw, starting from the hollow body 10 to the opening 21 of the air guide portion 20, wherein the mouth portion 26 has a length Lm, which extends from the air resistance element 25 to the opening 21 of the air guide portion 20. It has been found that advantageous flow conditions and drying results are achieved when 1.5 ≦ Lw / Lm ≦ 10, in particular 2 ≦ Lw / Lm ≦ 5. This also applies to the embodiments according to FIG. 4 to FIG. 15 , which will be discussed below.

In all embodiments, each air resistance element 23, 25 on a contact zone 27 which is attached to the adjacent wall 22, 24. According to FIG. 2 extends the contact zone 27 of the air resistance element 23 of a wall 22 substantially parallel to the opposite wall 24. In addition, the contact zone 27 has a fixing region 28 which serves for attachment to the other wall 24. In the exemplary embodiment, the fixing region 28 is welded or clinched to the wall 24.

In FIG. 3 the wall 22 air resistance elements 23 and the wall 24 also air resistance elements 25 on. All air resistance elements 23, 25 are, as in FIG. 1 shown along the width B of the hollow body 10 at regular intervals along the air guide portion 20 distributed. The contact zones 27 of both air resistance elements 23, 25 extend parallel to one another, wherein here too each contact zone 27 has a smaller fixing region 28, which, as in FIG FIG. 2 to Attachment serves. In both embodiments according to FIG. 2 and FIG. 3 the fixing region 28 is arranged on the side of the air-guiding region 20 facing the hollow body 10. In FIG. 2 For example, the depth of each air resistance element 23 is an amount T, which is essentially the same over its direction of extension to the opening 21. In contrast, the depth T in FIG. 3 of each air resistance element to the opening 21 of the air duct 20 from. FIG. 15 shows in another view how the fixation region 28 of one air resistance element 23.1 is attached to the fixing region 28 of the other air resistance element 25.1. The adjacent air resistance element 23.2, 25.2 has no fixing region 28.

As in FIG. 1 is shown, the air guide portion 20 may have a plurality of air resistance elements 23, 25. It has been shown in test results that particularly good flow conditions and good drying results can be achieved if the quotient of distance X and distance Y is 0.01 ≦ X / Y ≦ 0.3.

It may be advantageous that the air resistance elements have different geometric shapes, which in FIG. 4 to FIG. 6 as in FIGS. 8 to 11 is shown explicitly. For example, the air resistance elements 23, 25 may have a teardrop shape, which in FIG. 5 is shown. Alternatively, a nearly rectangular shape according to FIG. 4 conceivable or a circular shape FIG. 6 ,

Particularly advantageous according to all embodiments is that the device 1 according to the invention is formed from a metal part and / or roll profiled or bent. The air resistance elements 23, 25 are formed by a forming process, in particular via deep drawing or an embossing process. It is particularly advantageous that the free ends 29 of the air-guiding region 20 are beaded, so that no unnecessary turbulence occurs when the medium exits. In addition, the ends 29 have no risk of injury.

It can be particularly advantageous to arrange a flow element 4 within the hollow body 10, which makes it possible to direct the gaseous medium within the hollow body 10 in a desired direction, for example in the direction of the opening 21 For example, the volume flow along the entire width B of the hollow body can be made uniform on the entire opening area 21. In FIG. 4 to FIG. 6 this flow element is shown by way of example, this flow element 4 also in FIG. 1 to FIG. 3 can be used, which is not shown by way of example.

FIG. 7 schematically shows a printing press 2 with a drying unit 32 having a plurality of guide rollers 33. Each guide roller 33 is associated with a device 1, wherein the device 1 may be designed according to one of the described embodiments. The printing material 5 is guided through an input 34 into the drying unit 32 and leaves the drying unit 32 at the outlet 35. All openings 21 of the device 1 are aligned directly on the axis of rotation of the guide rollers 33, in the present embodiment, radially to the axis of rotation of the guide roller 33. This leaves to achieve a good drying effect on the substrate 5. Only the device 1, which is associated with the input 34, and the device 1, which is associated with the output 35, have a different orientation to the axis of rotation of the guide roller 33. The device 1 of the input 34 is oriented such that its opening 13 is aligned with the adjacent guide rollers 33, in particular, the orientation is oriented in the direction of movement of the printing material. The device 1 of the output 35 is also oriented such that its opening 13 is aligned in the direction of the adjacent guide rollers 33, in particular against the direction of movement of the printing material 5. The direction of movement of the printing material 5 runs from left to right, s. Arrow display. The left and the right orientation of the device 1 causes possibly located in the drying unit 32 solvents can not flow to the outside, in particular through the input 34 or through the output 35 to the outside. The drying unit 32 is located either between two inking units 31 or after the last inking unit 31 of the printing machine. 2

In FIG. 8 schematically, the device 1 according to the invention is shown, wherein the air resistance elements 23 of the one wall 22 have an offset Y / 2 to the air resistance elements 25 of the other wall 24. All air resistance elements 23, 25 may have the identical geometric shape. Also it is conceivable, what in FIG. 8 shown is two in their geometry differently executed air resistance elements 23.1, 23.2, 25.1, 25.2 are provided. The first air resistance element 23.1, 25.1 is made larger than the second air resistance element 23.2, 25.2. The first air resistance element 23.1, 25.1 offers a greater air resistance for the gaseous medium than the second air resistance element 23.2, 25.2. In the present exemplary embodiment, the larger air resistance element 23.1, 25.1 has a fixing region 28, which is provided for fastening to the opposite wall 22, 24. The attachment of the fixation region 28 may, as in FIG. 2 or FIG. 3 is described to be executed. Advantageously, a clinch connection to the fixation region 28 and the respective wall 22, 24 before. It is also conceivable that only one wall 22, 24 is designed with the differently designed air resistance elements 23, 25, wherein the fixing walls 28, which are provided at least at some air resistance elements 23, 25, with the opposite wall 22, 24 can take place.

In the assembled state of the hollow body 10, the air resistance elements 23, 25 are in all embodiments at a common height within the ventilation area 20, whereby a uniform drying over the entire width of the printing material 5 can be achieved.

In FIG. 9 to FIG. 12 It is shown that the hollow body 10 may have an opening 13 which is positioned opposite to the feed opening 11. The opening 13 and the feed opening 11 are closed by cover elements 12, 14. The feed opening 11 is closed by the lid member 12, wherein the opening 13 is closed by a lid member 14, which is not explicitly shown. The embodiment of the cover element 12 at the feed opening 11 essentially corresponds to the cover element 14 for the opening 13. However, an essential difference between the two covers 12, 14 is that the cover element 12 has a flow opening 16, thus from outside the gaseous medium into the hollow body 10 can get. The cover element 14 on the opposite side to the cover element 12 reliably closes the hollow body 10 so that the incoming gaseous medium can evenly leave the air guide region 20 in the direction of the printing material 5.

According to FIG. 9 and FIG. 10 the lid member 12 is positively and non-positively attached to the hollow body 10. The lid member 12 has a double-walled attachment portion 15 which in FIGS. 13 and 14 is shown. The attachment portion 15 has an inner portion 15.1 and an outer portion 15.2. Between the inner portion 15.1 and the outer portion 15.2 a free space 15.3 is executed, in which the hollow body 10 extends, which in FIG. 13 is shown schematically. The free space 15.3 serves as an assembly aid, so that a reliable seat of the lid member 12 is secured to the hollow body 10. In addition, fasteners 19.1 are provided, which bear against the inner wall of the hollow body 10 positively and non-positively. In the present embodiment, the fastening elements 19.1 are designed as screws which are located in the free space 15.3 and attack on their threads on the inside of the hollow body 10 and the inner and outer portion 15.1, 15.2. As a result, an effective attachment of the lid member 12 is achieved on the hollow body 10. In order to increase the fastening effect of the cover element 12 on the hollow body 10, it may be provided to form one or more projections 19.2 on the inner section 15.1 and / or on the outer section 15.2. As a result, a higher clamping effect between the cover element 12 and the hollow body 10 can be achieved. The projections 19.2 are exemplified in FIG. 14 shown. The projections 19.2 may be designed rib-like and have an extension in the free space 15.3, which is oriented in the width direction B of the hollow body 10.

In FIG. 11 and FIG. 12 schematically shows that the cover member 12 may have a latching lug 17 which engages in the inserted state on the hollow body 10 in a latching opening 18 of the hollow body 10. This also makes it possible to achieve a reliable attachment of the cover element 12 on the hollow body 10.

The described embodiments of the lid member 12 according to FIG. 9 to FIG. 14 can also refer to the lid member 14 which closes the opening 13.

In FIG. 13 For example, the cover element 12 has a flow element 4, which makes it possible to direct the inflowing gaseous medium within the hollow body 10 in the direction of the opening 21. The penetration depth of the flow element 4 is less than 10% of Overall width B of the hollow body 10, wherein the total width B is determined by the distance between the feed opening 11 and the opening 13 of the hollow body 10. The flow element 4 may have a curved course, which is oriented in the direction of the opening 21 of the air guide region 20. The cover element 12, 14 is made of a plastic injection-molded part, which preferably has a high electrical conductivity in order to avoid any electrical charges that may occur.

LIST OF REFERENCE NUMBERS

X

Distance between the walls 22, 24

lw

Length of the air duct 20

Lm

Length of the mouth section 26

B

Width, hollow body

T

Depth of the air resistance element

Y

Distance between two drag elements

1

device

2

press

3

line system

4

flow element

5

substrate

10

hollow body

11

feed

12

cover element

13

opening

14

cover element

15

attachment section

16

flow opening

17

locking lug

18

latching opening

15.1

inner section

15.2

outer section

15.3

free space

19.1

fastener

19.2

head Start

20

Air management

21

opening

22

wall

23

Air resistance element

24

wall

25

Air resistance element

26

mouth portion

27

contact zone

28

Freeze area

31

inking

32

drying unit

33

guide roll

34

entrance

35

exit

Claims (24)

Device (1) for drying a printing substrate provided with printing ink for a printing press (2)
a hollow body (10) which has an elongated air guide region (20) with an opening (21) in order to guide a gaseous medium out of the hollow body (10) in the direction of the printing material (5),
a feed opening (11) for guiding the gaseous medium into the hollow body (10), characterized
in that the hollow body (10) and the air-guiding region (20) form a common component of the same material. Device (1) according to claim 1,
characterized,
that the air guide portion (20) has two walls (22, 24) which are at least partially spaced from each other, wherein in particular the walls (22, 24) contact each other at least partially. Device (1) according to claim 1 or 2,
characterized,
in that the air guide region (20) has air resistance elements (23, 25) on at least one of the two walls (22, 24), in particular that the air resistance element (23, 25) has an elongate extent which extends in the direction of the opening (21) of the air guidance region (23). 20) is aligned. Device (1) according to one of the preceding claims,
characterized,
that the air guide portion (20) in the vicinity of its opening (21) has a mouth portion (26), in which there is no air resistance member (23, 25). Device (1) according to one of the preceding claims,
characterized,
in that the walls (22, 24) have a distance X from each other which lies in particular between 1 mm ≦ X ≦ 10 mm. Device (1) according to one of the preceding claims,
characterized,
in that the air-guiding region (20) has a length Lw from the hollow body (10) to the opening (21) of the air-guiding region (20), the mouth section (26) having a length Lm extending from the air-resistance element (23, 25) to the opening (21) of the air guide region (20), wherein 1.5 ≤ Lw / Lm ≤ 10, in particular 2 ≤ Lw / Lm ≤ 5 is. Device (1) according to one of the preceding claims,
characterized,
in that the air resistance element (23, 25) has a contact zone (27) which is fastened to the adjacent wall (22, 24), and / or a multiplicity of air resistance elements (23, 25) which are at a distance Y from one another in which, in particular, 0.01 ≦ X / Y ≦ 0.3, in particular 0.03 ≦ X / Y ≦ 0.08. Device (1) according to one of the preceding claims,
characterized,
in that both walls (22, 24) have air resistance elements (23, 25) which are in particular partially connected and / or fastened to each other at their contact zones (27). Device (1) according to one of the preceding claims,
characterized,
that the hollow body (10) and the air guide region (20) form a common metal part, in particular stamped bent part, and / or that the air resistance element (23, 25) is formed from the metal part, in particular deep-drawn or embossed. Device (1) according to one of the preceding claims,
characterized,
in that the walls (22, 24) run parallel to one another or the walls (22, 24) run conically with one another, the distance X becoming smaller towards the opening (21). Device (1) according to one of the preceding claims,
characterized,
in that the air resistance element (23, 25) has a depth T which is substantially uniform, and / or that the air resistance element (23, 25) has a depth T which decreases towards the opening (21) of the air guidance region (20). Device (1) according to one of the preceding claims,
characterized,
in that the contact zone (27) of the air resistance element (23, 25) of one wall (22, 24) runs essentially parallel to the opposite wall (22, 24) or the contact zone (27) of the air resistance element (23, 25) of the one wall ( 22, 24) extends substantially parallel to the contact zone (27) of the opposite air resistance element (23, 25) of the other wall (22, 24). Device (1) according to one of the preceding claims,
characterized,
that the two walls (22, 24) with one another positively and / or positively and / or materially connected, in particular that the two walls (22, 24) are welded or clinched. Device (1) according to one of the preceding claims,
characterized,
in that the air resistance elements (23, 25) of one wall (22, 24) are fastened to the opposite other wall (22, 24) or the air resistance elements (23, 25) of the one wall (22, 24) to the air resistance elements (23, 23). 25) of the other wall (22, 24) are attached. Device (1) according to one of the preceding claims,
characterized,
that a fixing portion (28) of the contact zone (27) of a wall (22, 24) for attachment with the other wall (22, 24) serves, in particular that the fixing region (28) on the said hollow body (10) facing side of the air guide portion (20) is arranged. Device (1) according to one of the preceding claims,
characterized,
in that the air resistance element (23, 25) tapers in the direction of the opening (21). Device (1) according to one of the preceding claims,
characterized,
in that at least one wall (22, 24) has a first (23.1, 25.1) and a second air resistance element (23.2, 25.2), the first air resistance element (23.1, 25.1) being geometrically different from the second air resistance element (23.2, 25.2), and / or that the first air resistance element (23.1, 25.1) has the fixing region (28), in particular the first air resistance element (23.1, 25.1) generates a greater air resistance for the gaseous medium than the second air resistance element (23.2, 25.2). Device (1) according to one of the preceding claims,
characterized,
in that the air resistance elements (23, 25) of one wall (22, 24) are arranged offset to the air resistance elements (23, 25) of the opposite wall (22, 24), and / or that the offset is 50% of the distance Y between two adjacent ones Air resistance elements (23, 25) of a wall (22, 24), wherein in particular the air resistance elements (23, 25) in the air guide region (20) are positioned at a common height. Device (1) according to one of the preceding claims,
characterized,
in that the hollow body (10) has an opening (13) which is positioned opposite to the feed opening (11), wherein a cover element (12, 14) is fastened to the opening (13) and / or to the feed opening (11), so that the hollow body (10) is closed, and / or that the cover element (12, 14) has a double-walled fastening section (15) into which the hollow body (10) extends, wherein the hollow body (10) is guided through the fastening section (15 ), wherein in particular the cover element (12, 14) is positively and / or positively and / or materially secured to the hollow body (10). Device (1) according to one of the preceding claims,
characterized,
that the fixing portion (15) having an inner portion (15.1) and an outer section (15.2), wherein between the inner portion (15.1) and the outer section (15.2), a free space (15.3) is located, in which the hollow body (10 ) extends, and / or that fastening elements (19.1) are provided in the attachment portion (15), which are at the same time in operative connection with the attachment portion (15) and on the hollow body (10). Device (1) according to one of the preceding claims,
characterized,
that the inner portion (15.1) and / or the outer portion (15.2) at least one projection (19.2) which projects into the free space (15.3). Device (1) according to one of the preceding claims,
characterized,
in that a flow element (4) is arranged inside the hollow body (10), which makes it possible to direct the gaseous medium within the hollow body (10) in the direction of the opening (21), wherein in particular the cover element (14) has the flow element (4) and / or in particular the flow element (4) has a penetration depth into the hollow body (10) that is less than 10% of the total width of the hollow body (10), the total width being defined by the distance between the feed opening (11) and the opening (13 ) of the hollow body (10) is determined. Printing machine (2) having a plurality of inking units (31), wherein a drying unit (32) is arranged between two inking units (31) or after the last inking unit (31), wherein the drying unit (32) comprises a plurality of apparatuses (1) according to one of the preceding claims having. Printing machine (2) according to claim 23,
characterized,
in that the drying unit (32) has a plurality of guide rollers (33), each guide roller (33) being associated with a device (1), the drying unit (32) having an inlet (34) through which the printing material (5) enters the drying unit (33). 32) is guided, and having an output (35) through which the printing material (5) leaves the drying unit (32), in particular that each opening (21) of the device (1) is aligned with the axis of rotation of the guide roller (33) the openings (21) of the devices (1) having the smallest distance from the outlet (35) and the entrance (34) are aligned with the adjacent guide roller (33).

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