EP1344573B1 - Coating head - Google Patents

Description

The invention relates to an applicator head for applying liquid media such as liquefied thermoplastics or molten Heißschmelzklebem on a relatively movable to the applicator head material web, with a housing having a roller chamber in the housing in which a roller slide is rotatably driven, with at least one feed opening for initiation from medium into the roller chamber and with a slot nozzle for discharging medium, which is controllable by the roller slide and extending transversely to the direction of movement of the material web. The application head can be arranged in particular contactless to the material web.

An applicator head of the aforementioned type is known from DE 197 14 029 C2 known. There, a roller slide is used, which in an axial region in which the feed opening is located, has a recess extending over the entire circumference. At least in this axial region can not be controlled by the roller slide outlet nozzle opening. This means that in this axial region the outlet nozzle openings must comply with an undesirably large distance. The roller slide is otherwise relatively short. For a larger length, it would be necessary to provide a plurality of feed openings, so that the above-mentioned problem occurred repeatedly along the nozzle in a corresponding number.

Another order head of this kind is from the DE 197 57 238 C2 known. In this case, the surface grooves are formed by axially parallel grooves on the roller slide or formed by mutually parallel helical (helix) -shaped grooves on the roller slide. Both versions are intended to achieve an economical application of liquid medium in an extremely even distribution on the material web.

In the US 2001/0032697 A1 discloses a method and apparatus for applying adhesive to cigarette tube papers. To control the glue application, the glue flow to five fixed nozzles is controlled by a middle rotating roller. In this case, each individual nozzle is associated with a roller slide segment, wherein each roller slide segment has a different diameter with respect to a roller slide housing. Due to the different radii of the roller slide sections is achieved that a different strong glue application is achieved on the various paths of the cigarette tubes. By individual elevations and depressions in the roller slide segments ensures that the supply of the adhesive to the individual nozzles is briefly interrupted, whereby a dot pattern of the glue application is achieved.

The document US 3,182,867 discloses a line-shaped arrangement of different glue application nozzles, which can be opened or closed by a common roller shutter. It is envisaged that the roller shutter can be rotated by hand, whereby a different width of the roller shutter comes to rest on the line-like arrangement of different nozzles and thus a different number of nozzles is opened or closed, each a contiguous line of active nozzles is available.

Finally, the reveals US 5,683,036 an applicator head for applying coatings to substrates. In this case, the supply of the coating material to the nozzles is controlled by externally controlled solenoid valves.

In many applications, application heads of the aforementioned type are always used where material webs are to be laminated onto a substrate. In order to keep the specific consumption of liquid medium low and at the same time ensure an extremely even distribution of the medium, an intermittent job is applied to render a job image in raster form. In order to allow a high transport speed of the material web, the order must be made in the direction of movement of the web at a high frequency, the grid points should sit as close to each other transversely to the direction of movement of the web.

The present invention has for its object to provide an applicator head of the aforementioned type, with which the consumption of liquid medium for special applications can be freely designed and / or further reduced.

• im Gehäuse ist eine Reihe von Zuführungsbohrungen von der Walzenkammer zur Düse ausgeführt,
• die Düse bildet eine Vielzahl von einzelnen Austrittsöffnungen, die jeweils mit einer der Zuführungsbohrungen im Gehäuse kommunizieren,
• der Walzenschieber hat eine Zylinderoberfläche, die die Zuführungsbohrungen zur Düse von innen abdichten kann,
• der Walzenschieber hat zumindest eine Oberflächennut in der Zylinderoberfläche, der flüssiges Medium zugeführt werden kann und die drehstellungsabhängig mit den Zuführungsbohrungen zur Düse kommunizieren kann und
• die zumindest eine Oberflächennut ist figurativ oder ornamental gestaltet. Der Begriff figurative oder ornamentale Oberflächennuten bedeutet, daß diese Oberflächennuten Begrenzungskanten mit veränderlicher Steigung zur Umfangsrichtung haben, bzw. daß sich die Lage der Begrenzungskanten längs der Schieberachse in Umfangsrichtung ungleichförmig ändert. Linear verlaufende Oberflächen nuten konstanter Breite sind hiermit nicht gemeint.

The solution for this is that the order header has the following features:

• in the housing a series of feed holes is made from the roller chamber to the nozzle,
• the nozzle forms a plurality of individual outlet openings, each communicating with one of the feed bores in the housing,
• the roller slide has a cylinder surface which can seal the feed holes to the nozzle from the inside,
• the roller slide has at least one surface groove in the cylinder surface, the liquid medium can be supplied and the rotational position can communicate with the supply holes to the nozzle and
• the at least one surface groove is figurative or ornamental. The term figurative or ornamental surface grooves means that these surface grooves have boundary edges with variable pitch to the circumferential direction, or that the position of the boundary edges along the slide axis changes non-uniformly in the circumferential direction. Linearly extending surfaces of constant width are not meant hereby.

In this way it is possible to deviate from a uniform order and to create special figurative or ornamental patterns. This may be due to the fact that the aufkaschierende on a substrate material web is later loaded higher at individual points than at others and thus to the former individual places must be fixed stronger. This may also be due to the fact that the material web to be laminated later onto a substrate has waste portions for which a previous application of medium is superfluous. As an example, the production of panty liners made of multilayer material with a bond along the peripheral edge can be mentioned.

According to a first solution, it is provided that the surface grooves comprise a plurality of circumferential grooves of variable width closed in the cylinder surface. According to a second solution, it is provided that the surface grooves comprise at least one groove, which in settlement a closed curve, z. B. a circle forms. According to a third solution, it is provided that the surface grooves comprise at least one groove of variable width encircling the cylinder surface over a limited circumference.

According to a further embodiment, it is proposed that the roller slide an inner cavity, the liquid medium can be supplied, as well as radial outlet holes, which lead from the inner cavity into the surface grooves comprises. In this case, the surface grooves are supplied via the interior of the roller slide. According to an alternative embodiment, it is proposed that the roller slide at least one circumferential groove, the liquid medium can be supplied, as well as connecting grooves, which lead from the circumferential groove into the at least one surface groove comprises. Hereby, the supply of surface grooves on the surface of the roller slide takes place.

An applicator head according to the invention is further preferably characterized in that the nozzle is designed as a slot nozzle and equipped with a diaphragm which forms the plurality of outlet openings along the slot nozzle. In this case, it is particularly proposed that the diaphragm is formed by a comb plate which is inserted into the slot nozzle and comprises a plurality of prongs, between which the plurality of outlet openings is formed.

In order to constantly supply medium to the interior of the roller slide, it can be provided that the roller slide identifies at least one journal which projects axially out of the housing, in which an axial bore is formed, which is connected to the internal cavity and serves to supply liquid medium. Another possibility for this is that at least one end of the housing, a nozzle is provided in the housing and an annular channel between the roller slide and roller chamber is formed, which is connected to the nozzle in the housing connected, and that radial feed holes in the roller slide in the plane of Ring channels are executed, which are connected to the inner cavity and serve to supply liquid medium.

The mentioned annular channel can be formed by an annular groove in the Wafzenkarnmeroberfläche. Preferably, the annular channel is formed by a circumferential groove in the surface of the roller slide, which is in communication with the supply port in the housing. The further guidance of the medium can also take place via transverse connecting grooves on the surface of the roller slide to at least one surface groove according to the invention. In this case, the nozzle would not extend beyond the extent of the at least one surface groove in the transverse direction. According to the preferred embodiment, it is provided that the medium from the annular groove is guided into the inner cavity and from there back into the surface groove, as already described in detail above.

From the surface grooves according to the invention, the medium passes in radial bores arranged along the housing. Depending on the change in the edge profile of the surface grooves in the circumferential direction more or less or other radial bores are applied during rotation of the roller slide so that the spray mist narrows or spread or extended at the nozzle. The representation of monofilaments transverse to the direction of movement of the material web can be generated by using a corresponding aperture with outlet openings at a small distance from one another in a slot nozzle. In this case, preferably each have a radial bore in the housing with an outlet opening in the aperture in conjunction.

Preferred embodiments of the invention will be explained below with reference to the drawings.

1. a) in perspektivischer Ansicht
2. b) in Einzeldarstellung des Walzenschiebers
3. c) im Querschnitt
4. d) in einer Einzeldarstellung des Kammblechs;

FIG. 1 shows a gun with circumferentially extending surface grooves of variable width in the roller slide and with feeds for medium through the housing

1. a) in perspective view
2. b) in an individual view of the roller slide
3. c) in cross-section
4. d) in a single representation of the comb plate;

1. a) in perspektivischer Ansicht
2. b) in Einzeldarstellung des Walzenschiebers
3. c) im Querschnitt
4. d) in einer Einzeldarstellung des Kammblechs.

FIG. 2 shows an applicator head with a circular surface in the surface of constant width in the roller slide and with a supply of medium through the housing

1. a) in perspective view
2. b) in an individual view of the roller slide
3. c) in cross-section
4. d) in a detail of the comb plate.

In the FIGS. 1 and 2 (a) an applicator head with a material web showing a job pattern, in perspective view, (b) the roller slide as a detail in perspective, (c) the housing with the roller slide in cross section and (d) a comb plate with housing bores as Detail shown.

FIG. 1 shows an applicator head 11 of elongated cubic shape. From the housing 12 of the applicator head 11 protrudes one end of a roller slide 13. The direction of rotation of the roller slide 13 is indicated by an arrow 14. The end of the roller slide 13 has a pin 15. The roller slide can be driven via the pin 15 by means of a servo motor. The housing 12 has two feed ports 16, via which, as indicated by the arrows 17, medium can be supplied. At the bottom of the housing 12, a slot nozzle 18 can be seen, emerge from the individual spray veils 19. The spray veils 19 strike a material web 22 whose direction of movement is symbolized by an arrow 23. The spray curtains 19 create individual application strips 24 on the web 22, which have periodically varying width. The variable width is generated by a variable width of the circumferential grooves 27 of the roller slide 13. The slot nozzle 18 includes a comb plate which generates perpendicular to the direction of movement of the web 22 extending individual threads, which, however, flow together after exiting to the Sprühschleiern 19. As can be seen in detail b), the roller slide 13 has on its cylindrical surface a plurality of circumferentially extending surface grooves 27 of periodically varying width. As can be seen further in cross-section c), the surface grooves 27 are supplied with medium via radial bores 28 from an inner cavity 29. The cavity 29 is in turn supplied via the feed pipe 16, annular grooves 25 and radial bores 26 in the roller slide 13 with medium. About the radial bores 28, the surface grooves 27 are constantly filled with medium. As can be further seen in cross section, the roller slide 13 runs in a cylindrical roller chamber 20 of the housing 12, from which radial bores 30 in the housing 12 lead to the slot 18. As shown in detail d), a comb plate 31 is formed in the slot nozzle 18 with webs 32 smaller thickness, so that each of the radial bores 30 is permanently openly connected to one of the lying between the tines 33 of the comb plate outlet openings 34.

FIG. 2 shows an applicator head 31 of elongated cubic shape. From the housing 32 of the applicator head 31 protrudes one end of a roller slide 33. The direction of rotation of the roller slide 33 is indicated by an arrow 34. The end of the roller slide 33 has a pin 35. The roller slide can be driven via the pin 35 by means of a servo motor. The housing 32 has two feed ports 36, over which, as indicated by the arrows 37, medium can be supplied. At the bottom of the housing 32, a slot nozzle 38 can be seen, from which a variable spray curtain 39 emerges. The spray curtain 39 strikes a material web 42 whose direction of movement is symbolized by an arrow 43. The spray curtain produces a job pattern 44 on the web 42 consisting of a series of circles of equal line width. The slot nozzle 38 includes a comb plate which generates perpendicular to the direction of movement of the web 42 extending individual threads, which flow together immediately after exiting to the spray curtain 39. As can be seen in detail b), the roller slide 33 has on its cylindrical surface a surface groove 47, which corresponds to the development of a circle. As can be seen further in cross-section c), the surface groove 47 is supplied with medium via radial bores 48 from an inner cavity 49. The cavity 49 is in turn supplied via the feed pipe 36, annular grooves 45 and radial bores 46 in the roller slide 33 with medium. Via the radial bores 48, the surface groove 47 is constantly filled with medium. As can be further seen in cross-section, the roller slide 33 runs in a cylindrical roller chamber 40 of the housing 32, from which radial bores 50 in the housing 32 lead to the slot nozzle 38. As shown in detail d), a comb plate 51 is formed in the slot nozzle 38 with webs 52 of lesser thickness, so that each of the radial bores 50 is permanently openly connected to one of the lying between the tines 53 of the comb plate outlet openings 54.

1. a) in perspektivischer Ansicht
2. b) in Einzeldarstellung des Walzenschiebers;

FIG. 3 shows a gun with two circumferentially extending surface grooves of limited circumferential length and variable width in the roller slide and with supplies for medium through the housing

1. a) in perspective view
2. b) in an individual view of the roller slide;

1. a) in perspektivischer Ansicht
2. b) in Einzeldarstellung des Walzenschiebers.

FIG. 4 shows a gun with two closed in development closed surface grooves each constant width in the roller valve and with a supply of medium through the housing

1. a) in perspective view
2. b) in an individual view of the roller slide.

In the Figures 3 and 4 is in each case (a) an applicator head with a material web, which shows a job pattern, in perspective view, and (b) the roller slide as a detail in a perspective view.

FIG. 3 shows an applicator head 11 of elongated cubic shape. From the housing 12 of the applicator head 11 protrudes one end of a roller slide 13. The direction of rotation of the roller slide 13 is indicated by an arrow 14. The end of the roller slide 13 has a pin 15. The roller slide can be driven via the pin 15 by means of a servo motor. The housing 12 has two feed ports 16, via which, as indicated by the arrows 17, medium can be supplied. At the bottom of the housing 12, a slot nozzle 18 can be seen, can emerge from the individual spray mist. The spray veils hit a material web 22 whose direction of movement is symbolized by an arrow 23. The spray curtains produce individual strip-shaped application patterns 24 ₁ ', 24 ₂ ' on the material web 22, which have periodically variable width and limited length. The variable width is due to a variable width of the surface grooves 27 'of the roller slide 13 is generated. The slot nozzle 18 includes a comb plate which generates perpendicular to the direction of movement of the web 22 extending individual threads, which, however, can flow together after exiting to closed Sprühschleiern. As can be seen in detail b), the roller slide 13 has on its cylindrical surface a plurality of two surface grooves 27 'of variable width and limited circumferential length. The roller slide 13 is shown in two broken longitudinal sections, which are shown rotated by 180 ° with respect to their true assignment to each other. From a first surface groove 27 ₁ 'is characterized a middle portion and of a similar second surface groove 27 ₂ ' the two branched end portions recognizable. On the uniformly connected roller slide 13 ', the surface grooves 27 ₁ ', 27 ₂ 'have the same peripheral position and produce the parallel application strips 24 ₁ ', 24 ₂ '. Incidentally, the representations c) and d) of the FIG. 1 directed.

FIG. 4 shows an applicator head 31 of elongated cubic shape. From the housing 32 of the applicator head 31 protrudes one end of a roller slide 33 '. The direction of rotation of the roller slide 33 'is indicated by an arrow 34. The end of the roller slide 33 'has a pin 35. The roller slide can be driven via the pin 35 by means of a servo motor. The housing 32 has two feed ports 36, over which, as indicated by the arrows 37, medium can be supplied. At the bottom of the housing 32, a slot nozzle 38 can be seen, from which a variable spray curtain can emerge. The spray curtain strikes a material web 42 whose direction of movement is symbolized by an arrow 43. The spray curtain generates a job pattern on the web 42, which consists of a series of nested circles 44 ₁ 'and rectangles 44 ₂ ' with the same thickness. The slot nozzle 38 includes a comb plate which generates perpendicular to the direction of movement of the web 42 extending individual threads that can flow together immediately after exiting to a spray curtain. As can be seen in the detail b), the roller slide 33 'on its cylindrical surface has a first surface groove 47 ₁ ', which corresponds to the development of a circle, as well as a second surface groove lying within the same 47 ₂ ', which corresponds to the settlement of a rectangle. The surface grooves 47 ₁ ', 47 ₂ ' are supplied via radial bores from an inner cavity with medium. The cavity is in turn supplied via the supply nozzle 36, annular grooves and radial bores in the roller slide 33 'with medium. Via the radial bores, the surface grooves 47 ₁ ', 47 ₂ ' are constantly filled with medium. For the rest, the further illustrations c) and d) of FIG. 2 directed.

LIST OF REFERENCE NUMBERS

11, 31

gun

12, 32

casing

13, 33

roller slide

14, 34

arrow

15, 35

spigot

16, 36

Support

17, 37

arrow

18, 38

slot

19, 39

spray curtain

20, 40

rolling chamber

21, 41

radial bore

22, 42

web

23, 43

arrow

24, 44

order patterns

25, 45, -,

circumferential groove

26, 46, -,

radial bore

27, 47,

surface groove

28, 48

radial bore

29, 49

cavity

30, 50

housing bores

31, 51

comb plate

32, 52

Stege

33, 53

finger

34, 54

slot

Claims (12)

1. Application head (11, 31) for applying liquid media, such as liquefied thermoplastics or molten hot-melt adhesives, to a material web (22, 42) which is movable relative to the application head, having a housing (12, 32), having a roller chamber (20, 40) in the housing, in which roller chamber a roller valve (13, 33) is rotationally drivably supported, and having a nozzle (18, 38) for discharging medium, the nozzle being controllable by the roller valve (13, 33) and extending transversely to the direction of movement of the material web,

   - a row of supply bores (30, 50) are formed in the housing (12, 32), from the roller chamber (20, 40) to the slotted nozzle (18, 38),

   - the nozzle (18, 48) forms a multiplicity of individual outlet openings (34, 54) which each communicate with one of the supply bores (30, 50) in the housing,

   - the roller valve (13, 33) has a cylindrical surface which can seal from the inside the supply bores (30, 50) to the nozzle (18, 38),

   - the roller valve has at least one surface groove (27, 47) in the cylindrical surface, which groove can be supplied with liquid medium and which, as a function of the rotational position, can communicate with the supply bores (30, 50) to the nozzle,

   characterised
   in that the at least one surface groove (27, 47) is designed as a figure or ornament, the at least one surface groove comprising a plurality of continuous circumferential grooves (27) of variable width which are reproduced as application strips (24) on the material web (22) upon rotation of the roller valve (13).
2. Application head (11, 31) for applying liquid media, such as liquefied thermoplastics or molten hot-melt adhesives, to a material web (22, 42) which is movable relative to the application head, having a housing (12, 32), having a roller chamber (20, 40) in the housing, in which roller chamber a roller valve (13, 33) is rotationally drivably supported, and having a nozzle (18, 38) for discharging medium, the nozzle being controllable by the roller valve (13, 33) and extending transversely to the direction of movement of the material web,

   - a row of supply bores (30, 50) are formed in the housing (12, 32), from the roller chamber (20, 40) to the slotted nozzle (18, 38),

   - the nozzle (18, 48) forms a multiplicity of individual outlet openings (34, 54) which each communicate with one of the supply bores (30, 50) in the housing,

   - the roller valve (13, 33) has a cylindrical surface which can seal from the inside the supply bores (30, 50) to the nozzle (18, 38),

   - the roller valve has at least one surface groove (27, 47) in the cylindrical surface, which groove can be supplied with liquid medium and which, as a function of the rotational position, can communicate with the supply bores (30, 50) to the nozzle,

   characterised
   in that the at least one surface groove (27, 47) is designed as a figure or ornament, the at least one surface groove comprising at least one groove (47) which, in a developed view, forms a closed curve which is reproduced as an application pattern on the material web (42) upon rotation of the roller valve (33).
3. Application head (11, 31) for applying liquid media, such as liquefied thermoplastics or molten hot-melt adhesives, to a material web (22, 42) which is movable relative to the application head, having a housing (12, 32), having a roller chamber (20, 40) in the housing, in which roller chamber a roller valve (13, 33) is rotationally drivably supported, and having a nozzle (18, 38) for discharging medium, the nozzle being controllable by the roller valve (13, 33) and extending transversely to the direction of movement of the material web,

   - a row of supply bores (30, 50) are formed in the housing (12, 32), from the roller chamber (20, 40) to the slotted nozzle (18, 38),

   - the nozzle (18, 48) forms a multiplicity of individual outlet openings (34, 54) which each communicate with one of the supply bores (30, 50) in the housing,

   - the roller valve (13, 33) has a cylindrical surface which can seal from the inside the supply bores (30, 50) to the nozzle (18, 38),

   - the roller valve has at least one surface groove (27, 47) in the cylindrical surface, which groove can be supplied with liquid medium and which, as a function of the rotational position, can communicate with the supply bores (30, 50) to the nozzle,

   characterised
   in that the at least one surface groove (27, 47) is designed as a figure or ornament, the at least one surface groove comprising at least one groove (27') of limited circumferential extent and variable width which is reproduced as an application strip (24') upon rotation of the roller valve (33').
4. Application head according to one of Claims 1 to 3,
   characterised
   in that the roller valve (13, 33) comprises an inner cavity (29, 49) which can be supplied with liquid medium, as well as radial outlet bores (28, 48) which lead from the inner cavity into the surface grooves (27, 47).
5. Application head according to one of Claims 1 to 3,
   characterised
   in that the roller valve (13, 33) comprises at least one circumferential groove (25, 45) which can be supplied with liquid medium, as well as connecting grooves which lead from the circumferential groove (25, 45) into the at least one surface groove (27, 47).
6. Application head according to one of Claims 1 to 5,
   characterised
   in that the nozzle (18, 48) is slot-shaped and is provided with a diaphragm which forms the multiplicity of outlet openings (34, 54) along the nozzle (18, 48).
7. Application head according to Claim 6,
   characterised
   in that the diaphragm is formed by a comb plate (31, 51) which is inserted into the nozzle (18, 48) and which comprises a multiplicity of prongs (33, 53), between which the multiplicity of outlet openings (34, 54) are formed.
8. Application head according to one of Claims 1 to 7,
   characterised
   in that the roller valve (13, 33) has at least one journal (15, 35) which axially emerges from the housing and in which there is formed an axial bore which is connected to the inner cavity (29, 49) and serves to supply liquid medium.
9. Application head according to one of Claims 1 to 7,
   characterised
   in that at least one end of the housing (12, 32) a supply connecting piece (16, 36) is inserted in the housing, and an annular channel is formed between the roller valve (13, 33) and the roller chamber (20, 40), the annular channel being connected to the supply connecting piece, and
   in that in the roller valve (13, 33), in the plane of the annular channel, there are formed radial supply bores (26, 46) which are connected to the inner cavity (29, 49) and serve to supply liquid medium.
10. Application head according to Claim 9,
    characterised
    in that the annular channel is formed by an annular groove in the roller chamber surface (20, 40).
11. Application head according to Claim 9,
    characterised
    in that the annular channel is formed by a circumferential groove (25, 45) on the roller valve (13, 33).
12. Application head according to one of Claims 10 and 11,
    characterised
    in that the annular channel is sealed by shaft seals relative to the region of the roller valve (13, 33) which is provided with surface grooves (27, 47).

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