EP0623458B1 - Method and apparatus for applying adhesive on paper and/or plastic products - Google Patents

Description

The invention relates to a method for gluing Products made from paper and / or plastic, in particular from Flaps for envelopes, paper bags and the like, with a pressure sensitive adhesive and for applying a protective strip, which covers the pressure sensitive adhesive until use, in which one Material web with non-stick properties or one initially with a non-stick coated material web is moved forward, then the pressure sensitive adhesive on the material web or on the Non-stick agent is applied and with the pressure sensitive adhesive provided material web with formation of individual as protective strips serving strip is cut by immediate Place on the pre-moved with the pressure sensitive adhesive Adhere to products or to a product web.

The invention further relates to a device for Carrying out this process with a guide, pull and deflection roller conveying device for the material web, an application device for applying the pressure sensitive adhesive on the advanced material web, a cutting device for Cutting the web of material transverse to its direction, one Transport device for moving the products or the product web and a placement device with which the Material adhesive applied in contact with the material web brought forward products or the product web.

This method and device are from GB-A-1 570 782 known. There is a narrow strip of material in strip width worked, the material web of the product web in Strip length is fed and the separation of the Stripes only after merging or hanging up and with a cut that cuts both webs at the same time. Accordingly, the narrow web of material in their Continuously advanced in the longitudinal direction and aligned in the same direction advanced product web applied, the cutting device in the running direction of the interconnected webs is arranged behind the landing point.

The invention has for its object the application of Pressure sensitive adhesives and protective strips both procedural and simplify the device.

With regard to the method, this object is achieved according to the invention solved in that the strips before placing on the products or product web along its transverse to the longitudinal extent the longitudinal edge of the material web be cut off that the cut strips in their Be moved forward and that the strips during this Advance movement on products moved in the same direction or moved product web.

With regard to the device, the solution is that the Cutting device in the direction of travel of the material web in front of the Place is arranged that the cutting device for Cut through the material web with the width of the strip corresponding short cutting distances is provided and that the placement device for the further transport of the cut Strips in the direction of their width until they rest on the Products or the product web is formed.

The pressure sensitive adhesive is thus first of all suitable or pre-treated web of material and this is then divided into individual elements or strip-shaped Elements cut using the sheet material to form the protective strip serves. Immediately after disconnection the protective strips are these along with the Apply pressure sensitive adhesive to the product and protect this. This type of production is simple and straightforward. The further handling then differs not from the previous one, because once the protective strip is removed, the pressure sensitive adhesive remains in full adhere to his document with the result that the Pressure sensitive adhesive can be used as intended. Other features of the invention including the device the relevant characteristics result from subclaims in connection with the description and the drawing.

Fig. 1:

schematisch sowie in Seitenansicht einen Teil einer Vorrichtung zum Herstellen von Papier- und/oder Kunststoff- bzw. Mischprodukten zusammen mit einer Vorrichtung zum Auftragen von Haftklebemittel und Schutzstreifen;

Fig. 2:

in schematischer Darstellung sowie abgebrochen und in größerem Maßstab eine Seitenansicht der Vorrichtung zum Auftragen von Haftklebemittel und Schutzstreifen;

Fig. 3:

in perspektivischer Darstellung sowie in nochmals größerem Maßstab eine Einzelheit der Vorrichtung zum Auftragen von Haftklebemittel und Schutzstreifen;

Fig. 4:

in Seitenansicht sowie in nochmals anderem Maßstab eine Auftragswalze für Haftklebemittel nach Art einer Tiefdruckwalze;

Fig. 5:

eine Darstellung wie in Fig. 2 von einer abgewandelten Ausführungsform und

Fig. 6:

eine Darstellung wie in Fig. 3 bei Verwendung von Verfahren und Vorrichtung in Verbindung mit einem bahnförmigen Material, Produkt oder Zwischenprodukt.

The invention is described below with reference to exemplary embodiments which are illustrated in the drawing. Show:

Fig. 1:

schematically and in side view a part of a device for producing paper and / or plastic or mixed products together with a device for applying pressure sensitive adhesive and protective strips;

Fig. 2:

in a schematic representation and broken and on a larger scale a side view of the device for applying pressure sensitive adhesive and protective strips;

Fig. 3:

in perspective and on a still larger scale a detail of the device for applying pressure sensitive adhesive and protective strips;

Fig. 4:

in side view and in yet another scale an application roller for pressure sensitive adhesives in the manner of a gravure roller;

Fig. 5:

a representation as in Fig. 2 of a modified embodiment and

Fig. 6:

a representation as in Fig. 3 when using the method and device in connection with a sheet material, product or intermediate.

A device 1 for gluing paper and / or plastic or. Mixed products 2 e.g. in the form of envelopes 3 with one to covered for use with a protective strip 3 Pressure-sensitive adhesive 4 comprises a trough 5 or a doctor chamber 5 with pressure sensitive adhesive 4, one in the to be applied Pressure sensitive adhesive 4 immersing application roller 6. The device 1 further comprises a doctor device 7, various guide, pull and deflecting rollers 8 - 13, a rolling device 14 for a protective strip 3 forming material web 15 and a cutting device 16, to separate and / or at the same time as a laying device serves and with the help of the separated protective strips 3 be applied to the product.

The two rollers 8 are auxiliary pull rollers and direct arranged in front of the cutting device 16. The rollers 9, 11 and 12 and 13 are pure deflection rollers and the roller 1o is a pressure roller that acts as a counterpressure and Main draw roller (impression roller) is used. The material web 15 can be swiveled in the area of the application roller 6 on a lever arm 17 mounted pressure roller 1o, wherein also an actuator 18 of the swiveling pressure roller 1o is assigned. About the actuator 18 can also a transport interruption by lifting the train and Printing roller 1o take place. The actuator 18 controls also the pressing force with which the pressure roller 1o on the Application roller 6 is pressed. All of the above components are stored in a machine rack 19 and to the extent necessary with drives not shown Mistake.

The material web 15 is one in the unwind 14 stored role 2o deducted and initially essentially down to the deflection roller 13 and from there horizontally further to the deflection roller 12 and then again led up to the guide roller 11, the Tub 5 with the pressure sensitive adhesive 4 is bypassed. Of the Deflection roller 11 is the material web 15 to the pressure roller 10 performed, the pressure roller 1o at the same time as a deflection roller works. The material web 15 then continues obliquely upwards to the deflection roller 9 and then diagonally downwards to the two pull rollers 8, behind which the cutting device 16 is located.

The cutting device 16 comprises a cutting roller 21 with at least one cutting knife 22 (Fig. 3), with a counter cutting bar 23 or the like. According to FIG. 2 cooperates.

The cutting roller 21 separates the pressure-sensitive adhesive 4 Protective strips 3 from the material web 15 and then transports it with a vacuum and places it also on the product to be provided with pressure sensitive adhesive 2 under pressure, as can be seen schematically from FIG. 3. For this purpose there is also a counter pressure roller 24 assigned to the cutting roller 21 (Fig. 2).

The counter pressure roller 24 belongs to a group of several Transport rollers 25 of a conveyor line 26 of a production machine 27 for products of interest here, a part 28 of this production machine 27 together with the device 1 in Fig. 1 is shown. In the direction of transport is only behind the cutting roller 21 another storage device 29, whose details are of no interest here the remaining components of the production machine 27.

The function and operation of the device 1 and that the procedures used are as follows.

A web is used as material web 15, which according to Fig. 3 has a width that is equal to the length of those to be manufactured Protective strip 3 is. As a material for the Material web 15 can be any tear-resistant material can be used, which itself already has non-stick properties for the pressure sensitive adhesive 4 or in a first and in Fig. 2 with an arrow "X" schematically Process step shown with a non-stick agent is provided.

According to the exemplary embodiment, it is the material web 15 around a sheet of silicone paper. Silicone is suitable itself as a non-stick in connection with this PSA of interest 4. Basically, can but also any other suitable non-stick agent is used become.

The material web 15 coated with non-stick agent 2 to the applicator roller 6 and from this in the area of strip-shaped surfaces 3o with pressure sensitive adhesive 4 provided (Figures 2 and 3).

The strips 4 provided with pressure-sensitive adhesive 4 Surfaces 3o are shorter than the width of the material web 15 and they are spaced from each other. With help the cutting roller 21 of the cutting device 16 is the Material web 15 then into individual, strip-shaped elements 3 'cut, with each strip-shaped element 3 'corresponding to the area 3o pressure sensitive adhesive 4 wearing. The strip-shaped elements 3 'are concerned around protective strips cut off from the material web 15 3 together with pressure sensitive adhesive 4, each Protective strips 3 as carriers for the pressure sensitive adhesive 4 serves.

This is followed by the application of the pressure sensitive adhesive 4 provided protective strips 3 on the product 2, the pressure sensitive adhesive 4 directly on the product 2 arrives and then covered by the protective strip 3 is. The application of the pressure sensitive adhesive 4 to the Product 2 is therefore not made directly with the help of an application roller according to the application roller 6, but under Use of the as a carrier and after application also protective strip 3.

The application roller 6 is an anilox roller of the type Gravure roller. It has surfaces arranged in strips 31 (Fig. 4) with recesses arranged in a grid 32 on. The surfaces 31 are on the application roller 6 spaced from each other and also extend not over the entire length of the application roller 6. With the help the doctor device 7 ensures that the application roller 6 only in the area of the surfaces 31 with the depressions 32 transfers pressure sensitive adhesive to the material web 15.

Finally, the device 1 is in accordance with the exemplary embodiment over a rising part 33 of the conveyor line 26 of the production machine 27 for the paper and / or Plastic or mixed product 2 arranged as shown in Fig. 1 is shown.

A modified embodiment of a device 1a is shown in FIG. 5, with the same parts being the same Reference numbers and also carry the letter index a.

The device 1a has no tray for pressure sensitive adhesives and neither an application roller nor the others, effective elements in connection with the application roller on, but it is with a nozzle 4o a and with one associated carrying and deflecting roller 41a for applying Provide pressure sensitive adhesive. The nozzle 40a is preferred a slot nozzle and the pressure sensitive adhesive preferably a hot glue. To apply the Pressure sensitive adhesive, the nozzle 40a works intermittently, so that the pressure sensitive adhesive is spaced from each other reaches the material web 15 a.

In contrast to the device described first 1 there is also an additional pair of pull rollers 42a for the material web 15 a immediately in front of the nozzle 40 a.

All other components of the device 1a come with the device 1, whereby as in the illustrations of Fig. 1 and Fig. 5 known drive and Control elements are not shown.

It also applies to both exemplary embodiments that the pressure sensitive adhesive 4 flat and at a distance from each other and also at a distance from at least one edge 43 (FIG. 3) is arranged on the material web 15. After applying the protective strip 3 therefore covers the product 2 preferably all sides of the pressure sensitive adhesive 4 with a protruding edge 44 from.

Finally, in both cases the PSA is used 4 coated web section or the strip-shaped Element 3 'transverse to its greatest length from the web of material 15 separated and in this position on the Product 2 applied.

While Fig. 3 concerns the case that the coated Protective strips 3 are applied to “individual products” 2, Fig. 6 relates to the case that the product or intermediate 2b according to that shown in FIG. 6 Embodiment to a not yet in parts cut, web-shaped material.

Claims (11)

1. A method of glueing products (2) of paper and/or plastics, in particular closure flaps for envelopes, paper bags and the like, with a contact adhesive (4), and applying a protective strip which covers the contact adhesive until use, in which a web of material (15) with anti-adhesion properties or a web of material (15) which is initially coated with an anti-adhesion agent is advanced, then the contact adhesive (4) is applied to the web of material (15) or the anti-adhesion agent and the web of material (15) with the contact adhesive (4) is cut through to form individual strips (3) which serve as protective strips and which by being applied directly with the contact adhesive (4) to the advanced products (2) or a product web (2b) adhere thereto, characterised in that prior to being applied to the products (2) or the product web (2b) the strips (3) are cut off the web of material (15) along their longitudinal edge extending transversely with respect to the longitudinal extent of the web of material (15), that the cut-off strips (3) are advanced in their transverse direction and that during said advance movement the strips (3) are applied to the product web (2b) or products which are advanced in the same direction.
2. A method according to claim 1 characterised in that a silicone paper web is used as the web of material (15) with the anti-adhesion coating.
3. A method according to claim 1 or claim 2 characterised in that the contact adhesive (4) is applied to the web of material (15) over the surface thereof and in the form of spaced surface portions.
4. A method according to one of claims 1 to 3 characterised in that the contact adhesive (4) is applied to the web of material (15) at a spacing from at least one edge (43).
5. Apparatus for carrying out the method according to one of claims 1 to 4 comprising a conveyor arrangement (8 to 13) for the web of material (15), having guide, pulling and direction-changing rollers, an applicator arrangement (5 to 7, 40a) for applying the contact adhesive (4) to the advanced web of material (15), a cutting apparatus (16) for severing the web of material (15) transversely with respect to its direction of travel, a transport arrangement (26) for advancing the products (2) or the product web (2b) and a feed apparatus (21) with which the contact adhesive (4) applied to the web of material (15) is brought into contact with the advanced products (2) or the product web (2b), characterised in that the cutting apparatus (16) is arranged upstream of the contact location (24) in the direction of travel of the web of material (15), that the cutting apparatus (16) is provided for severing the web of material (15) with small cutting spacings corresponding to the width of the strips (3) and that the feed apparatus (21) is designed for further transportation of the cut-off strips (3) in the direction of the width thereof until they are applied to the products (2) or the product web (2b).
6. Apparatus according to claim 5 characterised in that the cutting apparatus (16) is at the same time in the form of a feed apparatus (21).
7. Apparatus according to claim 5 or claim 6 characterised in that the applicator apparatus (5 to 7) for applying the contact adhesive (4) to the web of material (15) has a trough (5) for the contact adhesive (4), an applicator roller (6) which dips into the trough (5) or the contact adhesive (4) and a doctor device (7) associated with the applicator roller (6).
8. Apparatus according to claim 7 characterised in that the web of material (15) which is drawn off a roll (20) is guided firstly downwardly and then under the trough (5) for the contact adhesive (4) and then on the side thereof and there upwardly again and then is guided on to the applicator roller (6) to and away therefrom and finally to the cutting apparatus (16).
9. Apparatus according to one of claim 5 to 8 characterised in that in the region of the applicator arrangement (5 to 7) the web of material (15) is guided around a pressure roller (10) which can be pivoted away and which is mounted on a lever arm (17) and which serves at the same time as a pulling roller.
10. Apparatus according to one of claims 7 to 9 characterised in that the applicator roller (6) has surfaces (31) arranged in a strip configuration with recesses (32) arranged in a grid configuration in the manner of an intaglio printing cylinder.
11. Apparatus according to claim 5 or claim 6 characterised in that the applicator arrangement is in the form of an intermittently operating nozzle (40a) for applying the contact adhesive (4) to the web of material (15a).

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