DE3218094A1 - APPLICATION DEVICE FOR APPLYING FOAMED MEDIA TO FLAT PRODUCTS - Google Patents

Abstract

1. An applicator device for applying foamed media on goods having large superficial areas, the device having a channel (22) which extends towards the application area and over the wording width, has consecutive upwardly and downwardly directed parts and terminates in an application slot (30), characterized by a controllable pressure pad (4) which is separated from the channel (22) by a diaphragm (40).

Description

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Mathias Mitter, Falkenstr. 5 7, 4815 Schloß Holte

Application device for applying foamed media on flat goods with an order channel leading in the direction of the order area, or the like.

The invention relates to an application device corresponding to the preamble of claim 1.

. There are already application devices according to the preamble of claim 1 known which have a feed channel. The known design of such an application device does not always guarantee, however, that the foamed medium is constantly and completely in constant motion is. (U.S. Patent 3,969,780).

When applying foamed media, in particular foamed dye liquor, to a material, possibly a textile product that strongly absorbs the foamed medium, a relatively large volume is required as the application medium. This volume of the order level must be supplied in such a way that it is ensured that the existing area in order foam has a constantly the same quality. "■

The application of foamed media has compared to the order of e.g. dye liquor has the considerable advantage that

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relatively small amounts of liquor can be evenly distributed over a relatively large working width and that the supply of the liquor to the goods due to its relatively large volume in foamed form is easier to control than is possible when applying viscous color pastes or relatively liquid color liquors is.

On the one hand, the foaming of liquors has considerable advantages over conventional liquor application a commodity, but there are also considerable problems to be overcome.

Foam generally remains where it is deposited. It doesn't move by itself, but has to go through it any means are transported. If foam remains in one place for a long time, it will age and settle Liquor free and newly arriving, fresh foam is impaired in its consistency.

The present invention is therefore based on the object of creating an application system with which it is possible is to supply large volumes of foamed liquor to an application area, it being ensured that a lot of "foamed liquor is available even in a relatively short time, but on the other hand no possibility it is given that the foam sets and ages in some angular areas. It must be guaranteed be that all of the foam introduced into the system is constantly and, if possible, continuously moved and no under- over the entire working width. different prints are available.

This task is made possible by the .inr characteristics of the claim 1 listed features solved. .

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With the application device according to the invention it is now possible to provide the application area with a relatively large volume in the channel, the channel serves on the one hand as a storage container, on the other hand as a supply space and due to its shape when continuing of the foam forces it to flow evenly to the application area.

Further advantageous embodiments of the subject matter according to claim 1 are described in the subclaims.

The foam can be applied through a sieve or through a Template can be made through. The foam essentially disintegrates in the sieve area or in the template area and is applied to the goods as a liquor. But it is also possible to apply the foam directly to the substrate bring to. The screens or stencils can be patterned or unpatterned. With screen printing machines or "screen printing "-like machines it is particularly important to the . To design the application device or the feed device to the application area according to the invention, as through the sampling of the sieve different volumes of liquor, which after destruction of the foam on the. Were is applied. This means that the different consumption, for example from the edge area in the Relationship to the central area of the order must be balanced.

As a foamed application agent, the sub- ' think of all kinds of chemicals. First of all, the application of paint, paint pastes and paint liquors is intended for Printing, or dyeing. However, a latex foam, for example, can also be applied as a layer. Others too Layers can be applied as long as their chemicals can be foamed.

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The product or web can also be treated by the foam e.g. by foamed finishing chemicals or washed.

In particular, webs of material with a fibrous structure come into consideration as the substrate, such as textiles of all types, including e.g. also carpets, pile ware, such as velvet, furthermore fleeces, but also felts. But the application device is also Can be used for non-woven or paper, possibly also for printing or sampling of plastics and the like or for Coating the same.

Depending on the result to be achieved or depending on the work to be carried out, the foam is more or less or controlled pressure applied.

Further characteristics and features emerge from the exemplary embodiments described below.

Some exemplary embodiments of the invention are illustrated by means of 1 to 5 explained. Show it:

Fig. 1 shows an embodiment of the invention Application device designed with double feed and a controllable pressure low pressure pad in cross-section,

2 shows an installation example for the application device in schematic cross-section,

Fig. 3 shows an embodiment of the application device 'Similar to Fig. 1, but without a changeable pressure pad above the central space, but with inserted partition wall,

4 shows a one-sided feed. Fig. 5 is another. Exemplary embodiment in partial section.

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As can be seen from Fig. 1, there is the application device 1 of two essential parts, namely the feed device 2 and a doctor body 3. In the upper A controllable pressure pad 4 is provided in the area of the exemplary embodiment in FIG. 1.

In FIG. 1, in the upper region of the feed device 2, there are two feed pipes 20 which extend over the total working width and, in the exemplary embodiment shown, are drawn from one side wall 21 to the second side wall (not shown). These supply pipes 20 are optionally with hose connections or the like. vers.ehen for supplying a foamed medium from a foam generator 5. It is possible to provide a special foam feed for each feed pipe 20 and, if necessary, also a special foam generator. Such foam generators are known per se. They can be designed very differently, for example, consist of a dispers ion turbine for foam generation or according to., DE-PS 25 23 062 be designed

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A channel 22 is located below each of the supply pipes 20 arranged, each feed pipe 20 discharging the foamed liquor into its associated channel 22.

Each of these channels 22 is designed in a cascade shape. and initially extends in the direction of a hairpin to the application level, rises after a turn and transfers the foam. after overflowing a cascade wall A common central space 222, which tapers downwards towards the application area 6. Both channels 22 are in, • 30 cross-section seen - mirror images of each other,

just like the supply pipes 20. - · ·

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The feed device 2 is built on any designed squeegee body 3, which adapts to the inner surface of a screen cylinder 7 in the lower area. This Screen cylinder can be patterned or unpatterned, consist of wire mesh, it can also be a simple one Be a sieve or a sieve belt template. The doctor body 3 preferably points in the middle, but optionally also off-center a through slot 30, which can taper in the lower area and to the template or the screen cylinder 7 is continuously open.

Above the central space 222 lies a pressure cushion 4 which is under controllable pressure and which leads to the central space 222 is separated by a membrane 40. The pressure chamber housing 41 is provided with a pressure line 42, which with a pressure measuring device 43 and an adjusting valve 44 is provided. This allows the specified pressure that is applied to the foamed medium. in the middle space 222, are precisely preselected. Because the medium itself has a counter pressure exerts, both pressure areas work in a regulating manner together. If the pressure drops in the area of the cascade-like channel 22, the pressure expands Membrane 40 from and above the controllable pressure pad 4 remains constant pressure in the application area.

The operation of the device is as follows:

First, the pressure cushion is built up in the pressure • cushion area 4 by letting in air or another pressure medium until a pressure of, for example, is built up 0.1 bar. The foam feed pipes bring via a pump (not shown) or via the foam generator 5 Put foam into the feeding device 2 until it is full and by introducing the pressure medium or of the foam in the feed device 2 builds up here • for example an internal pressure of 0.12 atmospheres, with this pressure across the movable membrane 40 is also increased

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the changeable, possibly also controllable, pressure pad 4 has an effect, which then also produces a pressure of, for example "0.12 bar or the like. Once the set pressure has been reached, the pumping in of the foam is regulated down and the device is ready to work. The "pressure in the interior of the feed device 2 is reduced by the outflow of the Foam or conversion of the foam into liquor in the application area 6, for example down to about 0.1 bar, either the foam generator by means known per se accelerated again or the foam feed through other devices is released again increasingly, whereby the device is refilled with foam. Therefore is a constant, relatively even .Dr-UCk in the Application device 1, in particular the feed device 2, so that a uniform outflow of the foam is guaranteed from the lower through slot 30. '

Such a mode of operation is known from DE-OS • 23 00 289. '... .-. ■ ".-' ■■" '

· The cheese-like, mirror-image formation of the channels 22 ensures a constantly uniform filling of the central space 222 and the tapering of the central space 222 towards the through-slot 30 ensures one steady influx under slightly increasing pressure up to

to order area 6. ''.

■ ... The descending leg 22a of the channel .22. is x-m ·· upper '.. ■ area narrower than in the lower area, -so that the under ■ . Pressure fed foam from the feed pipe. 22 has time something. to expand, then in the ascending branch is continued relatively evenly, whereby here too ', a slight opening of the clear space between the individual walls, so that the ascending branch in the upper area is slightly wider than in the entrance area, the one below, lies. The transitions are rounded,

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so that under no circumstances can any corners form in which foam could settle. this applies to both the outer area and the inner area of the walls made of sheet metal or plastic of the channels 22. These curves must go into one another without any edges.

The design of the lower doctor body 3 can be chosen freely. A squeegee shoe is advantageous. This should adapt to the shape of the screen cylinder 7 and be designed in the manner of a slotted doctor blade.

In Fig. 2 an assembly example of the device is shown. In this exemplary embodiment, the application device 1 has two feed pipes 20 with a number Connection pieces 120 distributed over their length, which are connected to inlets 220 coming from the outside. The overall device is thus a closed system or a closed double system.

The application device 1 is arranged on both sides Bearing rods 11 held. These can be on the side bearing heads of a screen printing station or on a machine frame be mounted adjustable in height and adjustable, which is not shown. These bearings are for doctor blade assemblies and paint supply pipes are known.

The compressed air or another pressure medium is preferably fed centrally to the pressure pad 4.

The schematically indicated foaming device or a foam generator 5 has, in a manner known per se, a drift air feed 50 and a liquor feed 51. Both Inlets are provided with control valves 52, 53.

The illustration of FIG. 3 corresponds essentially to the embodiment of FIG. 1, but is in the upper part Area no controllable pressure pad 4 provided.

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Cascade walls 122 continue after a rounding into the walls of the central area 222, which diverge are in relation to each other. All walls are preferably from one side wall 21 to the opposite one Sidewall pulled, namely after

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Possibility without a seam or any heels.

The overflow area leading to central space 222 is covered by roundings 322 which open into a partition 422 and are brought together in this. the The partition wall is guided into the central space 222 so far that a narrowing of the cross-sections a is still avoided will. This partition serves to prevent the foam surfaces or foam streams coming from the right and left to collide, which could result in a traffic jam, but rather to channel them towards the

Through slot 30 in the doctor body 3. ■

In Fig. 4, an embodiment is shown with only one-sided feeding. Here it is also possible to have the doctor body 3 eccentrically with the through slot 30 to provide. In this embodiment there is only one Feed pipe 20 is provided and only one channel 22, wherein but this is designed in exactly the same way as the channels of exemplary embodiments 1 and 3. Only the middle room 222 is not present, but a descending branch 222a, which is in the upper area of the through slot 30 of the squeegee body 3 opens *

The lower curve 522 can be approximately the size of the upper one Roundings 322 correspond, the upper rounding 322 generally being slightly larger in radius than the lower Rounding 522.

Thus, not only do the clear widths of the channels 22 run in the shape of a hairpin up to the central area 222 or up to descending branch 222a ,, but also the walls are each cascading or hairpin-shaped, namely the inner walls of a hairpin shape as well as the inner walls then continuing exterior walls.

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There is also the possibility of providing nozzles or other means of increasing the pressure build-up inside the device in the squeegee body 3, which is designed similarly to a slotted squeegee. This can also be done in that the through slot 30 tapers or becomes narrower towards the bottom or towards the lower part.

In Fig. 5, a further embodiment is shown. In the upper area of the application device according to the invention there are again two feed pipes 20 which are arranged parallel to one another and which in turn have terminal side walls traverse or are closed by the side walls 21. Connection pieces 120 are in turn provided with inlets 220, which bring the application medium into the tubes 20. The channels 22 are again in the form of wide slots with smooth side walls in a cascading up and down shape out, the deflections in the flow direction each covered by roundings 322 and possibly are narrowed. These curves each run together in partition walls 622, so that the guidance of the application medium meander takes place.

. In Fig. 5 a double system is shown, i.e. two Feed pipes 20 through openings 320 the foamed Enter the medium into the meander-shaped slot.

The entry is made in the upper area of a descending Branches of the wide slot, thus running downwards and then ascending, descending again and ascending again., until the foam is given into the central space 222 will.

The directions of flow are each indicated in arrows.

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The number of diversions can be selected as required.

The closed feed system can be divided in the middle and can be assembled. These. Divisibility made easier also a cleaning.

The bearing rods 11, which are shown in FIG. 2, are in turn fastened to the side walls 8.

In the lower area it is shown that there is the possibility of the slotted doctor foot or the doctor body 3 over Springs 32 on the feeding device. 2 to store, whereby the feed slot, for example, through a soft membrane or the like. has a shortening portion 33 so that the squeegee body 3 is softly spring-loaded onto the fixedly mounted feed part 2. The springs are rubber-elastic Plates incorporated on both sides of the central room lie. The springs 32 can be made of rubber, plastic, spring steel sheet or the like. exist. You can also go by springy Elements of a different kind are replaced, e.g. springs arranged in rows, rubber buffers arranged in rows are arranged or the like.

Furthermore, the possibility is shown to use spacers or Provide guide plates 9 in the area of the channels 22. These secure the distance of the as. Partition walls 622 serving side walls or cascade walls of the slot or broad-channel it.

One must take into account that such a device. works for example over 5 m working width.

In Fig. 5 it is shown that the device 'also in a slightly smaller screen cylinder 7 can be used. In this case, the squeegee body 3 could possibly be exchanged if the greater curvature of the smaller screen cylinder is to be taken into account.

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It is essential that a device of bearing rods 11 or the like. outside of the screen cylinder 7 worn adjustable in height is formed and an application system is available in the work area or over the working width consists of at least one channel 22 drawn across the working width in the form of a wide slot in and outgoing form, which is in an order slot, in a Number or in rows of order openings opens.

Of course, the concept of the invention is not limited to the illustrated embodiment. at In the illustrated embodiment, e.g., Fig. 5, the cross-sections are narrowed in each of the deflection areas. The other exemplary embodiments, however, show that non-narrowed cross-sections in the deflection areas are conceivable and possible if the narrowing of the deflection areas also increases the flow rate. causes diness.

• It is also possible, instead of the bearing rods 11, which are attached to · .. The feed pipes or at least one feed pipe 20 are each flanged to the side walls 21 to pull outwards. But this is only for smaller ar- ■ Widths conceivable and possible. In such a case, the feed pipes can serve as bearing rods.

The advantage of the entire device exists for all Embodiments in that the foam is not deposited anywhere. Not even a subset can be anywhere stop. Even the smallest foam bubble is constantly pushed on by the foam flowing in.

The constrictions present in each case give the 3.0 a slowing down and thus an equalization of the foam. First the foam is compressed and then it expands again.

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The disclosed features individually and in combination, insofar as they are new compared to the state of the art, regarded as essential to the invention.

Claims (26)

t "να." J J ^ IÖUy4 Dr. Loesenbeck (iö $ o) - ,. Il -. Λ · χ *.: Diol.J / ;: 9. Stracke ^ '* - * ". ^ .-.' ; .. *.: .. Mitter 'lbk Dpi.in r.it .-. I'-iv-iT: hl ·. 164, 4300 Bieseieid 1 patent claims 1. Application device for applying foamed media to flat goods with a direction towards the application area leading order channels or the like., thereby .Identified that the over the working width drawn channel (22) als.Breitschlitz in open and outgoing shape is formed and in an order • slot (30) or the like. flows out. 2. Application device according to claim 1, characterized in that that the application device consists of a feed device (2) with at least one channel (22) which in the lower area carries a doctor body (3), which in its shape of the inner circumferential surface of a preferably rotating template, a screen cylinder (7) or the like. is adapted and the order slot (30) or the like. wearing. 3. Application device according to claim 2, characterized in that the squeegee body (3) as a slotted squeegee with a continuous, application seat tapering towards the application surface (30) is formed. ·. 4. Application device according to claim 1, - characterized in that that the channel (22) designed as a wide slot in ascending and descending form, over the entire working width is guided and forms the connection between a feed pipe (20) for the application medium and the application jer. Through slot (30). a doctor body (3). Middle 5. Application device according to claim 1 and 4, characterized in that that the feed pipe (20) in the inlet area of a descending branch of the channel (22) and extends over the inlet area. 18094 Kitter 6. Apparatus according to claim 1, characterized in that that two cascade-like channels (22) mirror images of each other opposite the application slot or Passage slot (30) are assigned to the application device. 7. Apparatus according to claim 6, characterized in that that the two cascade-like channels (22) merge into one another above the application or through slot (30) and a common feed channel or central space (222) above the application area .. 8. Apparatus according to claim 6, characterized in that that both channels (22) in the upper / area through a partition or partition (422) are separated from each other, 9. Apparatus according to claim 1 and 7, characterized in that that the central space (222) or the common supply channel in the upper area with a variable adjustable or controllable pressure pad (4). is provided. 10. The device according to claim 1 and one of the following claims, characterized in that the channel (22) a hairpin-shaped, downwards has extending area, which is rounded out into the central space (222) or into a descending branch (222a) opens, these leading to the application area (6). 11. The device according to claim 10, characterized in that the descending branch of the hairpin shape in the cascade of the channel (22) is designed to widen up to the lower rounding (522). ' 12. The device according to claim 1 and 11, characterized in that 'that the ascending branch of the hairpin shape of the . nales (22) widening to the upper rounding (322) is trained. '·'. · 13. Device according to claims 1 and 8, characterized in that that the partition (422) is drawn so far that the clear distance to the walls lying on the side of the central space (222) is not smaller or slightly smaller than the clear width achieved in the duct. 14. The device according to claim 1 and eihem of the following claims, characterized in that the cascade formed channel is formed evenly widening and then after leaving the cascade tapered again towards the application area. 15. Apparatus according to claim 1 and 3, characterized in that the through slot (30) or the application slot is designed to taper downwards or downwards in the lower area. 16. The device according to claim 1, characterized in that at least one extending over the working width Feed tube (20) is arranged, which lies in the upper region of the application device and to which a downward. extending branch (22a) of the cascade-shaped Channel connects, which runs vertically and in a vorzugsw at an acute angle opens to it ascending branch (22b), which in turn opens into a central space (222) or into a descending branch (222a). 17. The device according to claim 1, characterized in - that two parallel supply pipes (20) are arranged in the application device and the channels (22) adjoining them gradually expand in cross section widening in S-shape up to a central space ' (222) are guided and this, standing vertically, tapering, is guided to the application area or to the through slot (30) of the doctor body (3). I0U34 middle 18. The device according to claim 1, characterized in that the feed device (2) is designed as a closed system. 19. The device according to claim 18, characterized in that the feed device as a closed, two-sided Feed system, designed as a double system is. 20. The device according to claim 1 and one of the following claims, characterized in that the feed device (2) is designed to be centrally divisible in the central region of the central space (222). 21. Device according to claim 1 and one of the following Claims, characterized in that the smooth side walls of the feed device (2) are parallel to one another and converge in pairs to form partitions (622), all walls preferably being parallel to one another. 22. The device according to claim 21, characterized in that the partition walls (622) or the cascade walls are drawn as far are that the cross-sections of the deflection areas narrow. *. 23. The device according to claim 1 and one of the following claims, characterized in that between the parallel or at an angle to each other walls of the channel [ (22) Guide and spacer plates (9) are arranged, which extend in the direction of flow. 24. The device according to claim 1 and one of the following claims, characterized in that more than three deflections are provided in the cascade or meander-shaped guide of the _r wide slot of the feed device (2). O L IOU34 Witter 25. The device according to claim 1 and one of the following Claims, characterized in that the device is supported by bearing rods (11) which are adjustable in height and are adjustably mounted on the side bearing heads of a screen template or on a machine frame. 26. The device according to claim 1 and one of the following claims, characterized in that the feed pipes (20) have a number of connecting pieces (120) with of outside incoming inflows (220) are assigned.