EP0329829B1 - Dispositif d'application de colle ou de produit similaire sur une surface - Google Patents

Dispositif d'application de colle ou de produit similaire sur une surface Download PDF

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Publication number
EP0329829B1
EP0329829B1 EP88117966A EP88117966A EP0329829B1 EP 0329829 B1 EP0329829 B1 EP 0329829B1 EP 88117966 A EP88117966 A EP 88117966A EP 88117966 A EP88117966 A EP 88117966A EP 0329829 B1 EP0329829 B1 EP 0329829B1
Authority
EP
European Patent Office
Prior art keywords
adhesive
glue
slit
application
intermediate plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88117966A
Other languages
German (de)
English (en)
Other versions
EP0329829A2 (fr
EP0329829A3 (en
Inventor
Josef Rothen
Wolfgang Meissner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ITW Dynatec GmbH
Original Assignee
ITW Dynatec GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by ITW Dynatec GmbH filed Critical ITW Dynatec GmbH
Publication of EP0329829A2 publication Critical patent/EP0329829A2/fr
Publication of EP0329829A3 publication Critical patent/EP0329829A3/de
Application granted granted Critical
Publication of EP0329829B1 publication Critical patent/EP0329829B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/027—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated
    • B05C5/0275—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated flow controlled, e.g. by a valve
    • B05C5/0279—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated flow controlled, e.g. by a valve independently, e.g. individually, flow controlled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0258—Coating heads with slot-shaped outlet flow controlled, e.g. by a valve

Definitions

  • the invention relates to a device of the type corresponding to the preamble of claim 1.
  • the starting point of the invention has been problems which occurred during the production of hygiene articles.
  • articles such as diaper pants for babies, diaper pads, sanitary napkins, medical pads, surgical pads and the like, which are used to collect liquid separated from the body and on one side a liquid-impermeable, very flexible film of low thickness, for example made of polypropylene of 12 to 15 My ( Micrometers) to which a flat suction pad made of cellulose or a suitable plastic material is glued, which in turn is covered by a fleece.
  • the absorbent pad consists of a loose material in the manner of a short-fiber cotton, which must be fixed on the film so that it stays in place and does not slip when handling the article. For this reason, the suction pad is glued to the film.
  • a reasonably uniform distribution requires, in particular, a low viscosity of the hot-melt adhesive, which was therefore applied at temperatures of 110 to 140 ° C.
  • the uniformity was unsatisfactory.
  • the preamble of claim 1 is based on EP-B1 96 453, in which an application device is disclosed in which slit nozzles which extend closely above the web transversely to the direction of advance thereof lie opposite one another in pairs in the direction of advance and are separated from one another by a separating plate.
  • the two slot nozzles in a pair create a double-layer application and are each supplied by a common pump.
  • Several such arrangements can be provided next to one another in the transverse direction of the web, each of which then has its own separately driven pump, so that differences in the delivery quantities across the web cannot be ruled out.
  • the object of the invention is to design a generic device such that very small application quantities per unit area can be applied in a uniformly uniform manner to a leading substrate over its width.
  • slot nozzle should be preferred hydrodynamically because, for example, due to manufacturing tolerances, it has a slightly larger slot width, or because the flow resistance of the channels to the slot nozzle is somewhat lower, this slot nozzle will only provide exactly the pump that is assigned to it exit the assigned order quantity. If such a hydrodynamically preferred area is present in the case of a slot nozzle that extends over the entire width of the application, the application quantity preferably emerges at this point and the pressure drops sharply towards the sides, so that different application quantities per unit area cannot be avoided.
  • a return valve is assigned to the application valve, which e.g. when the application valve closes, the glue stream returns to the supply, so that the glue stream is always exposed to a uniform flow pressure and the glue application is not only very uniform in the transverse direction, but also precisely limited at the ends.
  • the basic idea of the paired order and return valves is known per se from DE-PS 32 00 469.
  • An application device with several adjacent units is known per se from DE-PS 30 07 031. However, these are not slotted nozzles from which the application medium emerges under pressure, but rather inclined run-off surfaces over which a liquid application medium runs down onto a web in order to produce a strip-by-layer application there. This device is not suitable for higher-viscosity application agents such as glue.
  • the separate glue streams assigned to the individual slot nozzles are supplied in the invention by a multiple gear pump, in which, for example, against a common central wheel, a corresponding number of planets arranged counter gears works that produce cleanly separated flow rates.
  • the glue has to be applied to a sensitive film
  • the application quantity can be reduced to an amount of 0.2 g / m2. Quite apart from the saving of glue, this has the effect that the heat capacity of the applied glue is very low and the thermal load on the substrate, ie the film, remains low.
  • Another factor works in the same direction, namely that in order to even out the application, it is no longer necessary to ensure that the glue has as low a viscosity as possible with a continuous slot nozzle.
  • the application is also even when applied with a slightly higher viscosity. This means that the temperature of the glue can be reduced to around 65 ° C. without loss of uniformity, which also reduces the stress on the film.
  • gluing of the film for the hygiene articles mentioned is the starting point and preferred example of application of the invention, but it is understood that the device can also be used for substrates other than the films mentioned, in particular for the uniform application of very small amounts of glue. Likewise, the glue is only the preferred application of the invention and other liquid to highly viscous application agents are by no means excluded.
  • the adjacent individual slot nozzles can be formed in the manner shown in claim 2.
  • the two “surfaces” are formed, for example, by an end face of a nozzle plate provided on the device, in which the feed channels open, and a clamping strip extending in front of it, which clamp the slotted plate between them.
  • the feed channels open into the areas of the slotted plate that remain free between the webs, so that the glue passes through the back of the slotted plate and the webs are channeled and a union of the individual glue streams only takes place directly in front of the exit point, so that on the one hand there is a uniform coverage of the application width, and a transfer of glue from a slot nozzle into the neighboring one is practically prevented.
  • the nozzle plate is an integral part of the device, as a result of which a distribution of the outlet openings of the feed channels in the end face of the nozzle plate is predetermined at certain distances in the direction of the application width. Now it may happen that the order width has to be changed.
  • the intermediate plate according to claim 3 is used, with the aid of which the exit points of the feed channels opening into the individual slot nozzles can be pulled apart or pushed together.
  • the slotted plate and the intermediate plate are replaced, and it is therefore possible to work with eight slit nozzles, for example 35 mm wide, instead of eight slit nozzles a 30 mm wide, without any assembly work other than unscrewing the terminal strip and replacing the Slotted sheet and the intermediate plate are required.
  • the device 100 shown in FIGS. 1 and 2 is used to provide the film web 1 with a very thin layer of hot-melt adhesive over an application width 2 (FIG. 2) evenly.
  • the film web 1 consists of polypropylene of 15 my thickness and is guided past the exit point 3 of the hot-melt adhesive in the manner shown in FIG. 1 with a slight wrap angle and a slight longitudinal tension. The film web 1 is therefore not supported at the exit point 3.
  • the device 100 comprises an application head, designated as a whole by 4, and this in turn comprises an application block 5 with inner channels, which can be seen in detail in FIG. 3.
  • the application block 5 is held by two side walls 6, which are connected by a cross plate 7, which in turn is fastened in a suitable manner above the film web 1 in the machine frame.
  • a drive motor 8 is fastened to the cross plate 7 and drives an eightfold gear pump 10 mounted on the order block 5 via an angular gear 9.
  • the eightfold gear pump 10 comprises eight individual gear pumps which generate eight metered glue flows which are independent of one another and which are passed through inner channels into the application block 5.
  • the liquid glue brought up from a melting device, not shown, passes through a filter 11 and enters the application block 5 at the channel 12 and into the eight-way gear pump 10 at the mouth 13, which doses the glue in eight independent flows in eight according to FIG 3 gives vertical channels 14, which are distributed across the width of the web in the order block 5.
  • An order valve 15 is assigned to each channel 14 and is connected to the channel 14 via a transverse channel 17.
  • each channel 14 is assigned a return valve 16 arranged above the application valve 15, which is connected to the channel 14 via a transverse channel 18.
  • a glue return 20 is also connected to the return valve 16 via a transverse channel 19.
  • the valves 15, 16 have the same design in terms of their hydrodynamic resistance and are pneumatically controlled.
  • the air supply lines are labeled 21 and 22, respectively.
  • the design is such that the valves 15, 16 are always controlled alternately, i.e. when the order valve 15 closes, the return valve 16 opens and allows the glue conveyed in the channel 14 by the pump 10 instead of via the cross channel 17 to the order valve 15 via the cross channel 18 to the return valve 16, which is then opened and the glue in forwards the glue return 20. In this way, a glue flow of constant pressure can be maintained in the channel 14 regardless of the actuation of the application valve 15, in which no pressure surges occur due to the closing of the application valve 15.
  • valve pairs 15, 16 are provided next to one another in accordance with the number of channels 14.
  • a nozzle plate 23 is screwed under the application block 5 and the application valve 15, which has a vertical or essentially end face 24 which extends substantially perpendicular to the substrate and into which eight glue channels 25, which start from the respective outlet mouth of the application valves 15, open .
  • a slotted plate 30 is arranged in front of the end face 24, the shape of which can be seen in FIG. 5 and which is screwed against the end face 24 by a clamping strip 26 with a flat rear face 27.
  • the end face 24 and the rear face 27 have lower edges 28 and 29, respectively, which are at the same height.
  • the slotted plate 30 is made of brass or corrosion-resistant steel and has a thickness of 0.3 mm. It covers the end face 24.
  • a rectangular cut-out 31 is formed, which extends over the application width 2 (FIG. 2) and which in the exemplary embodiment has seven webs 32 protruding into the cut-out 31 in equal intervals, in the embodiment 31 Chambers 33 is divided.
  • the webs 32 are about 1 mm wide and tapered at the front.
  • the tip lies at a short distance 34 (FIG. 6), for example 1 mm, above the lower edge 28 of the end face 24 when the slotted plate 30 is mounted in the manner shown in FIG. 3.
  • the chambers 33 are closed on three sides, but open at the bottom and, together with the surfaces 24 and 27, form downwardly opening, separate slot nozzles 35 (FIG. 2).
  • the valves 15, 16 are arranged close to each other. Their width is essentially fixed, so that a certain transverse distance between the glue channels 25 cannot be undershot. If the Order width 2 is dimensioned so that the division of the glue channels 25 coincides with the division of the slot nozzles 35, the glue channels 25 can open directly into the slot nozzles 35 formed, as shown in Fig. 3.
  • the intermediate plate 40 has the same outline as the end face 24 or the slotted plate 30.
  • the webs 32 In the assembled state according to FIG. 4, the webs 32 each extend at the locations of the interruptions between successive spreading grooves 36.
  • the middle six spreading grooves 36 have through bores 37 in the middle which pass through to the rear side of the intermediate plate 40 shown in FIG. 10 . From the mouths of the through bores 37 on the back, angled channels 38, formed as grooves, lead to the points 39, which lie opposite the mouths of the glue channels 25 in the end face 24 of the nozzle plate 23.
  • the locations 39 have the distance from one another corresponding to the glue channels 25, the through bores 37 have the distance given by the slot nozzles 35.
  • the associated channel 38 ' is arranged on the front side of the intermediate plate 40 shown in FIG. 7 for spatial reasons.
  • the openings of the through bores 37 in the spreading grooves 36 are denoted by 41 in FIG. 9.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (4)

  1. Dispositif pour appliquer de la colle ou un produit analogue sur une surface d'un support qui défile, notamment d'une couche thermosensible de protection contre l'humidité, sur des articles d'hygiène, comprenant :
    - un réservoir d'alimentation de colle,
    - une tête applicatrice avec un ensemble de buses à fente, disposées transversalement à la direction d'avancée du support, l'ensemble des buses à fente se composant de plusieurs buses à fente (35), distinctes, juxtaposées, dont les fentes de sortie (33) sont directement adjacentes au niveau du point de sortie (3) et dans lesquelles, les flux de colle sont encore séparés jusque directement en amont du point du sortie (3), selon la direction d'écoulement de la colle, ces flux étant commandés chacun par sa propre soupape d'alimentation (15),
    - ainsi qu'un moyen de pompage pour prendre la colle du réservoir et alimenter la tête applicatrice (4),
       dispositif caractérisé en ce que
    - les buses à fente (35) ont une faible largeur, de l'ordre de 30 à 35 mm, suffisante pour assurer une répartition régulière de la colle,
    - le moyen de pompage est constitué par plusieurs pompes à engrenages (10), chacune des pompes à engrenages fournissant aux buses à fente (35) associées, des flux de colle en quantités identiques, dosées indépendamment,
    - et pour maintenir une pression constante dans le flux de colle, une soupape de retour (16), indépendante, actionnée en alternance, et donnant la même perte de charge est associée à chaque soupape d'application (15).
  2. Dispositif selon la revendication 1, caractérisé en ce que
    - les buses à fente (35) sont formées par une tôle à fente (30) fixée entre deux surfaces planes (24, 27),
    - des canaux de colle (25) alimentés par plusieurs pompes à engrenages (10) débouchant dans les surfaces (27),
    - les bords inférieurs (28, 29) des surfaces (24, 27) situés à la même hauteur délimitent le point de sortie (3), et
    - la tôle à fentes (30) comporte entre les différentes fentes de sortie (33) correspondant aux différentes buses à fente (35), d'étroites entretoises (32) en saillie à la manière de dents de peigne, et qui se terminent directement en amont du point de sortie (3) dans la direction d'écoulement de la colle.
  3. Dispositif selon la revendication 1, caractérisé en ce que
    - les canaux de colle (25) débouchent dans une surface (24) de la tête applicatrice (4), perpendiculairement à la direction d'avancé du support (1), et une plaque intermédiaire (40) est appliquée contre la surface (24), l'autre face de cette plaque venant contre une tôle à fentes (30) présentant d'étroites entretoises (32) en saillie à la manière des dents d'un peigne, entre les fentes de sortie (33) correspondant aux différentes buses à fente (35),
    - et la plaque intermédiaire (40) comporte des canaux de passage dont les sorties (41) arrivent dans les différentes buses à fente (35) formées par la tôle à fentes (30) et les sorties sont écartées d'un intervalle différent à celui des embouchures (39) situées sur l'autre côté.
  4. Dispositif selon la revendication 3, caractérisé en ce que les canaux de passage ont des perçages traversants (37, 37') perpendiculaires à la plaque intermédiaire (40) et les intervalles différents sont obtenus par des rainures transversales (38, 38') dirigés transversalement et situés sur au moins un côté de la plaque intermédiaire (40).
EP88117966A 1988-02-17 1988-10-28 Dispositif d'application de colle ou de produit similaire sur une surface Expired - Lifetime EP0329829B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3804856A DE3804856A1 (de) 1988-02-17 1988-02-17 Vorrichtung zum flaechigen auftragen von leim oder dergleichen
DE3804856 1988-02-17

Publications (3)

Publication Number Publication Date
EP0329829A2 EP0329829A2 (fr) 1989-08-30
EP0329829A3 EP0329829A3 (en) 1990-03-07
EP0329829B1 true EP0329829B1 (fr) 1993-10-27

Family

ID=6347546

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88117966A Expired - Lifetime EP0329829B1 (fr) 1988-02-17 1988-10-28 Dispositif d'application de colle ou de produit similaire sur une surface

Country Status (4)

Country Link
US (2) US5000112A (fr)
EP (1) EP0329829B1 (fr)
DE (1) DE3804856A1 (fr)
ES (1) ES2049740T3 (fr)

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ES2049740T3 (es) 1994-05-01
US5000112A (en) 1991-03-19
DE3804856C2 (fr) 1992-07-30
US5083526A (en) 1992-01-28
EP0329829A2 (fr) 1989-08-30
DE3804856A1 (de) 1989-08-31
EP0329829A3 (en) 1990-03-07

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