DE20311530U1 - Device for mechanical adhesive transfer - Google Patents

Abstract

The application device for the machine transfer of adhesive onto a relatively moved material sheet (3), especially a paper, film or cardboard web, has at least one carrier (1) with a number of small adhesive beads (2) and a controllable feed device which brings the carrier with the adhesive beads into contact with the material web. The application device has a controllable transporting drive for the revolving movement of the carrier. The carrier is mounted on a storage roller (4) and is guided over a pressure roller (7) to a receiving roller (5) which accommodates the used carrier material.

Description

The The invention relates to a device for mechanical adhesive transfer on a relatively moving web or a sequence of those to be provided with an adhesive surface Gege stalls especially of paper or cardboard webs.

Out WO 96/26148 are cross-gluing units for fast-running paper webs on rotary printing presses which have a liquid adhesive track Apply to a paper or cardboard web. This is done by a guide the paper web around a rotating application cylinder, on which exhaust valves are arranged, which are cycled per revolution of the application cylinder a defined amount of a liquid adhesive apply to the paper web. The control of these cross gluing units usually takes place via a synchronous drive, which with an upstream printing machine or similar connected is.

Further are from DE-297 13 744 U1 longitudinal and cross gluing units for known the same area of application, in which controlled by stationary nozzles with fast Piezo drives a fluid Glue is applied to the fast running paper web.

The DE-299 11 781 U1 is concerned with an application device a liquid or pasty Medium on a running surface. The order is made by a screen belt positioned tangentially to a roller. DE-198 19 054 A1 describes a Method and a device for assembly and rough and fine adjustment of components on a mounting base using a bed from a shrinkable Addressed adhesive. DE-36 28 194 relates to an ink ribbon for Dye transfer under the influence of heat using a thermal print head on a recording medium. The Ribbon exists for this from a carrier layer with a sublimable release layer, on which the color layer is arranged.

task The present invention is an improved device for mechanical adhesive transfer show.

This Task is solved with the features in the main claim.

The claimed application device has the advantage that instead of liquid adhesives very small and dimensionally stable PSA drops relative to the Application device moving material web are applied. The with liquid Adhesives related problems of safe handling, control, nozzle and pipe clogging, cleaning, etc. can be avoided. The pressure-sensitive adhesive drops offer immediate adhesion and adhesive effect without cooling and dry seasons.

The Applicator has a wide range of uses, any Types and relative speeds of material webs includes. Latter can e.g. a more or less fast running paper, foil or cardboard web or a sequence of individual items, e.g. Packaging blanks, boxes or the like, in the sense of a material flow. Between the application device and the material or the material web there is a relative movement. In most use cases here the application device is arranged stationary, the Material to be glued to the application device as a running material web or material flow past. The kinematic assignment can also be reversed, the applicator relative to the material emotional. This is e.g. B. in large format Materials or objects the case being at rest or at slow speed can move. In the following description, all materials and applications are standardized referred to under the term material web. This includes both the mentioned running paper webs etc., material flows of individual objects, as also the transient or stationary Arrangement of individual materials or objects.

The PSA drops are present in a grid structure on the carrier. This has the advantage when pressing the carrier together of the material web the PSA drops in a precisely controllable Crowd and local Distribution from the carrier superseded and transferred to the material web become. However, only as many PSA drops are used replaced, how they are covered by the pressed material. Adhesive beads, that do not come into contact with the material remain on the Carrier. As a result, adhesive surfaces delimited exactly on the contact surface are transferred.

The PSA drops have a high cohesion, which makes them a have high dimensional stability, which prevents them from neighboring adhesive drops converge and larger drops to form like this with liquid Adhesives is the case. Furthermore, the PSA drops have to the carrier a relatively low adhesion on, which is dimensioned so that the drops are strong on the carrier stick enough even at high carrier movement speeds not fall off, but when pressing the carrier with the Detach material web to which they have a higher adhesion from the carrier and transferred to the material web become.

The carrier is brought into contact with the material web by means of an infeed device and is further moved by a transport drive during idle times and / or during rail contact. The carrier can be pressed onto the relatively moving material web at variable cycle rates or permanently. When the carrier rotates around the pressure roller and at the same time this pressure roller is pressed onto the material web, pressure-sensitive adhesive drops are transferred from the carrier to the material web, whereby short or elongated adhesive surfaces are generated, depending on the length of time the pressure is applied and the speed relative to the material web.

By Varying the beam width and varying the contact length can adhesive surfaces from pressure-sensitive adhesive drops both in strips in the transverse or longitudinal direction of the material web flow as well as being applied over a large area. Becomes a narrow beam over one pressed on for a relatively long time, so one develops along the Strip-shaped adhesive surface extending material web flow. Becomes a wide beam over one pressed on for a very short period of time, this creates a strip-like Adhesive surface, which extends across the material web flow. Thus, both longitudinal and cross-gluing is also possible with the same device.

Of Furthermore, the device described is lower due to lower running speeds Subject to wear and the fact that the adhesive drops adhere to the carrier does not detached Drops of pressure sensitive adhesive on the carrier which remains as used material on the take-up roll is rolled up, and thus no contamination or incorrect sticking produce. Thus, the device is far less maintenance intensive and more universally applicable than previously known longitudinal and transverse gluing units.

The Control and drive of the machine application device are preferably designed in such a way that there is an independent drive for the application device, which, for example, by optical scanning of material identification points the relatively moving web of material is controlled. This can on elaborate Synchronization drives are dispensed with.

Around also high-frequency movements of the feed device or the pressure roller to allow the drive can preferably be a combination of some piezo elements be designed as an activator or in another suitable form.

Around with high-frequency movement of the pressure roller, if possible To achieve a short stroke, the material web can preferably be in bowing with tensioning rollers under the pressure roller run or over guided a suction roll become. This ensures that the material web is a relative to Direction of stroke of the pressure roller maintains discreet location, whereby the pressure roller is ensured even with a small stroke, that there is no longer any contact between the carrier and the material web.

alternative for moving the pressure roller in another version the invention provides a statically arranged pressure roller. To a to enable the carrier and material web to be pressed together in cycles, the material web is stretched over a deflectable or deliverable underground, the material web with each arching of the subsurface to the pressure roller is pressed.

The Invention is exemplary and schematic in the drawings shown. Show it:

1 a side view of an application device with a running material web to produce a longitudinal or transverse adhesive line,

2 FIG. 1 shows a side view of an application device that extends along the direction of travel of the paper web,

3 : a side view of an indirect transfer device of adhesive dots and

4 : A top view of a carrier with different options for the grid-like arrangement of the adhesive drops on the carrier.

1 shows a side view of an application device ( 9 ) for the mechanical transfer of an adhesive in the form of pressure-sensitive adhesive drops ( 2 ) from a rotating carrier ( 1 ) on a material web moved relative to the application device ( 3 ) to create longitudinal and / or transverse bonds. The material web ( 3 ) can be a flexible paper, film or cardboard web or a sequence of other and possibly also rigid workpieces.

Machines in printing or packaging technology are a preferred area of application. These are, for example, rotary printing machines, in particular web or sheet-fed offset machines for more or less fast-running paper webs in newspaper or commercial printing, or webs of packaging material or blanks. The application device ( 9 ) can be designed as a cross gluing unit or as a longitudinal gluing unit or as a combination device. In the embodiments with a high relative speed, such as occur, for example, in newspaper or commercial printing, the application device is preferably stationary with respect to the running material web ( 3 ) arranged.

In the field of packaging technology, the application device ( 9 ) can also be assigned to a printing press. Because of the stiffer packaging materials, the transport speed of the running material web is generally lower. Here, for. B. cardboard webs can be provided with adhesive. Likewise, individual packaging blanks can be glued in packaging technology.

On further application in the preferred field of printing and Packaging technology is in the finish area of the products. this concerns z. B. attaching by-products or product samples to printed matter, z. B. Magazines. The by-products can be data carriers in the form from CD's or the like trade other by-products. Product samples are e.g. B. Trial packs of Detergents, perfumes or the like in flat, flexible plastic sleeves. This Parts can be made using the claimed adhesive technology connected to the printed product become. The adhesive leaves either on the printed product or the product or also attach both.

In packaging technology, e.g. B. film packaging provided with a strip-shaped adhesive and then sealed. In an application example, this is protective plastic film bags that can be used for transportation purposes, any products, for. B. also magazines or other printed products. In packaging technology, packaging blanks can otherwise also be pasted at various stages of production. The packaging blank can, on the one hand, be a flat material. But it can also be a cubic structure, e.g. B. act a partially erected carton or the like. A particularly favorable area of application is packaging made of plastics, in particular colorless and transparent or opaque plastics. The likewise preferably colorless adhesive can be used particularly well here and does not disturb the appearance of the finished packaging. In the case of larger and, in particular, partially erected packaging materials, it is also favorable to apply the application device ( 9 ) to move relative to the standing or slowly moving packaging.

The adhesive consists of very small drops of pressure sensitive adhesive ( 2 ), which are arranged individually in a grid and contactless but close together. The PSA drops ( 2 ) can be colorless or colored in any way. The carrier ( 1 ) on which the PSA drops ( 2 ) are preferably formed in a flexible manner in the form of a strip and are suitably in the application device ( 9 ) stored and stocked. The carrier ( 1 ) with its adhesive drops ( 2 ) in contact with the material web ( 3 ) brought.

For this, the carrier ( 1 ) eg on a storage role ( 4 ) stored. From this storage role ( 4 ) the carrier ( 1 ) around a cross to the material web ( 3 ) adjustable pressure roller that can be rotated about its own axis and possibly rotated ( 7 ) tight and taut and continue to a take-up roll ( 5 ) directed, which takes up and stores the used carrier material again.

For the transport of the carrier ( 1 ) there may be one or more suitable transport drives. The roles ( 4 . 5 ) can have a controllable rotary drive, for example. The transport drive can be operated during idle times or during job contact.

The pressure roller ( 7 ) is a short distance above the material web ( 3 ) deliverable, in particular arranged vertically movable and drivable and controllable in such a way that they move very quickly onto the material web for intervals of any length ( 3 ) can be pressed on. In the area of the pressure roller, there is a flat or curved counter pressure surface under the material web ( 6 ) arranged, which can be stationary or movable, for example in the form of a rotating counter-pressure roller.

In order to ensure that the material web () 3 ) to the counter pressure surface ( 6 ), the material web ( 3 ) with tensioning rollers over an arched back surface ( 6 ) or the counter back surface can be replaced by a suction roller. This ensures that the pressure roller ( 7 ) with carrier ( 1 ) quickly off the material web ( 3 ) after the PSA drops ( 2 ) have been transferred.

In 2 is a side view of the pressure roller ( 7 ) of the application device ( 9 ). As indicated by the dashed lines, one or more different supports ( 1 ) can be arranged in any width and position. If a wide beam is pressed on briefly ( 1 ) on the material web ( 3 ) a narrow cross bond is created. If a narrow beam is pressed on for a long time ( 1 ) longitudinal gluing can be produced. Accordingly, depending on the choice of carrier width and the control of the pressure roller ( 7 ) any dimensioned adhesive surfaces on the material web ( 3 ) are applied.

In a further embodiment of the invention, instead of moving the pressure roller ( 7 ) the counter-pressure surface can be moved and replaced, for example, by an archable hose structure which is directed towards a fixed pressure roller ( 7 ) bulges and thus the material web ( 3 ) briefly against the wearer ( 1 ) pressed.

3 shows an application device ( 9 ) For an indirect transfer of the PSA points ( 2 ). It has a rotatable transfer roller ( 8th ), which the PSA points ( 2 ) on one side of a carrier ( 1 ) decreases and on another side to one of the carrier ( 1 ) spaced material web ( 3 ) issues.

The indirect transmission of 3 has particular advantages when it comes to unstable material webs ( 3 ) and / or around high transport speeds of material webs ( 3 ) goes. A time buffer can be created here, especially if the bonds on the fast moving material web ( 3 ) have a sufficiently large repeat. In this case, the transfer roller ( 8th ) with a peripheral speed that essentially corresponds to the web running speed. In addition, the circumference or diameter of the transfer roller ( 8th ) preferably chosen so that it is sufficient for the application of an adhesive line in the desired width. The transfer roller ( 8th ) has a correspondingly suitable rotary drive and also an infeed device. In the process, the preferably synchronously rotating transfer roller ( 8th ) your adopted PSA drops ( 2 ) to the material web ( 3 ) in delivery position. Then the transfer roller ( 8th ) withdrawn and in contact with the wearer ( 1 ), from which they added a new batch of PSA ( 2 ) takes over. For this, the transfer roller ( 8th ) correspondingly slower. After the assembly, it is attached to the material web ( 3 ) delivered at the required time and hands over the pressure-sensitive adhesive points ( 2 ). If the repeat of the material web ( 3 ) is too short, several transfer rollers ( 8th ) in a magazine arrangement, e.g. B. a rotating star, can be arranged to the time buffer between the fast moving material web ( 3 ) and the correspondingly quick transfer of the adhesive point on the one hand and the slow movement of the carrier ( 1 ) and the adhesive point transfer there.

The top views in 4 show four possible different arrangements of PSA drops ( 2 ) on a support ( 1 ) in the form of a flat grid. The adhesive drops ( 2 ) are very small and have a diameter of approx. 1 millimeter, for example. The diameter can alternatively be smaller or larger and can be up to a few millimeters, for example up to 5 millimeters.

The PSA drops ( 2 ) are arranged in several rows next to each other in the flat grid without mutual contact. The distances between the PSA drops ( 2 ) are about the size of their diameter or smaller. The PSA drops ( 2 ) can be arranged in even rows and columns and thus on the same longitudinal and transverse line with each other. The rows of adhesive drops can alternatively be arranged with an offset, as a result of which the packing density is increased.

Likewise, the PSA drops ( 2 ) be applied in the form of dots, squares or other and the distances between them are varied in such a way that areas of different packing density are created.

The PSA drops ( 2 ) can have any cubic shape. In the preferred embodiment, they have a spherical or drop-like shape with a round cross section. Alternatively, the shape can also be cylindrical or tubular. Furthermore, the PSA drops ( 2 ) have a cubic shape with a prismatic cross section.

The carrier ( 1 ) is a one- or two-sided repellent carrier ( 1 ) with a very low adhesive effect to the PSA drops ( 2 ) educated. The carrier ( 1 ) have on one or both sides, for example, a silicone-containing or silicone-free non-stick coating or the like.

If with a multi-stage adhesive dot transfer and with one or more transfer rollers ( 8th ) or other suitable transfer means, a graded adhesive effect is required. The carrier ( 1 ) has the lowest and ultimately glued material web ( 3 ) the highest adhesion effect. The transfer roller (s) ( 8th ) then has an intermediate adhesive effect, which makes it possible, on the one hand, to remove the PSA points from the carrier ( 1 ) on the transfer roller ( 8th ) and then from there to the material web ( 3 ) to deliver. The adhesive effect is also so large that during the free rotation of the transfer roller ( 8th ) there is no unwanted detachment.

The adhesive drops ( 2 ) consist of a pressure sensitive adhesive, the internal cohesive forces are greater than the external adhesive forces against the carrier ( 1 ). The PSA drops ( 2 ) can be carried out by the wearer ( 1 ) if they are on their free side with the material web ( 3 ) that have a greater adhesive or adhesive effect than the carrier ( 1 ) Has. The pressure sensitive adhesive can be made of any suitable material, for example dispersions, acrylates or synthetic rubber. The pressure sensitive adhesive can also be formed by a hot melt adhesive which is shock-cooled with cold or the like. The adhesive strength or the cohesive and adhesive effect can be varied depending on the area of application and need, for example via the area size, the height and the spacing of the PSA drops ( 2 ) and the formulation of the adhesive.

The PSA drops ( 2 ) have on the back ger ( 1 ) the above-mentioned low liability, so that it touches the material web ( 3 ) stick and easily come off the carrier ( 1 ) solve. Depending on the contact duration, the diameter of the pressure roller and the grid dimension, more or fewer rows of droplets in the relative running direction of the material web ( 3 ) detached and onto the material web ( 3 ) transfer. If the carrier ( 1 ) rotates through the transport drive when it comes into contact with the web and moves in the relative running direction at a corresponding speed, the number of droplet rows dispensed and thus the length of the adhesive surface in the running direction can be increased.

1

carrier

2

Adhesive beads

3

web

4

storage roll

5

up roll

6

Counterpressure surface

7

pressure roller

8th

Transfer roll

9

Applicator applicator

Claims (12)

Application device for mechanical adhesive transfer to a relatively moving material web ( 3 ), in particular a paper or film or cardboard web, characterized in that the application device ( 9 ) at least one carrier ( 1 ) with a variety of small PSA drops ( 2 ) and has a controllable delivery device that supports the carrier ( 1 ) with the adhesive drops ( 2 ) in contact with the material web ( 3 ) brings. Application device according to claim 1, characterized in that the application device ( 9 ) a controllable transport drive for the circular movement of the carrier ( 1 ) having. Applicator according to claim 1 or 2, characterized in that the carrier ( 1 ) on a storage roll ( 4 ) stored and via a pressure roller ( 7 ) to a recording role ( 5 ) is guided, which takes up the used carrier material. Application device according to claim 1, 2 or 3, characterized in that by controlled intervals of the compression of the carrier ( 1 ) and material web ( 3 ) both longitudinal and transverse bonds can be applied. Application device according to one of the preceding claims, characterized in that the pressure-sensitive adhesive drops ( 2 ) on the carrier ( 1 ) are arranged in a flat grid without mutual contact. Application device according to one of the preceding claims, characterized in that the adhesion of the adhesive drops ( 2 ) on the carrier ( 1 ) is less than their cohesion, with the PSA drops ( 2 ) in contact with the material web ( 3 ) from the carrier ( 1 ) are solvable. Applicator according to one of the preceding claims, characterized in that the carrier ( 1 ) as one or both sides repellent carrier ( 1 ) with low adhesive effect to the PSA drops ( 2 ) is trained. Application device according to one of the preceding claims, characterized in that the pressure-sensitive adhesive drops ( 2 ) have a diameter of approximately 1 to 5 mm or less. Application device according to one of the preceding claims, characterized in that the pressure-sensitive adhesive drops ( 2 ) have a spherical, cylindrical, tubular or drop-like shape with a round cross-section. Application device according to one of the preceding claims, characterized in that the pressure-sensitive adhesive drops ( 2 ) have a cubic shape with a prismatic cross section. Applicator according to one of the preceding claims, characterized in that the grid consists of a plurality of rows of pressure-sensitive adhesive drops ( 2 ) exists, the distances of which can be varied freely and are regular or even. Application device according to one of the preceding claims, characterized in that the pressure-sensitive adhesive drops ( 2 ) consist of a cold or hot applied pressure sensitive adhesive.