EP0798131B1 - Method and device for adhesive binding of printed products - Google Patents

Description

The invention is in the field of further processing of printed products and relates to a method and a device according to the preamble of the corresponding independent claims.

The inventive method and the device for performing the Methods are used for perfect binding, that is to say for connecting a plurality of stacked partial products in the area of a stacking area for the production of finished products with glued back, whereby a Partial product from a single or multiple folded sheets or several, simply folded Bow can exist. The products consist of a fibrous one Material such as paper. The manufactured by the perfect binding Products are, for example, magazines, brochures, books or the like. The adhesive backing can continue with a backing strip that is part of the Cover sheets of the finished product can be covered.

As long as single sheets or simply folded partial products, that means ever two sides connected by a folded edge, through each other an adhesive backing can be connected, this can be done with little effort become. It is only necessary to ensure that the adhesive used is such Penetrates between the sub-products, on the one hand, the sub-products are sufficient held together and that, on the other hand, opening the finished one Product due to the mutual bonding of the partial products only minimal is hindered, a minimal such disability is not avoided can be.

But are multi-layer, folded sub-products, for example multiple folded sheets or a plurality of nested, simply folded The result is to connect the sheets together using an adhesive backing Another problem to be solved: in addition to that edges or folded edges of sub-products are to be connected, the connecting one Effect of the adhesive through the outer folded edges reach inner fold edges such that the inner parts of each part product be held on the adhesive back.

According to the state of the art, adhesive backs are made of multi-layer Partial products made by folding through the folded edges the multi-layer part products formed back surface is milled so deep that all folded edges (possibly without the innermost folded edge) removed and actually a stack of unfolded single sheets arises, which is then glued like one.

According to the publications EP-A-0158493 or US-A-2277266 Edge areas of stacked single sheets in one Perfect binding should be joined together before applying of the adhesive roughened with a suitable tool. One such is disclosed in publication EP-A-0158493 Pretreatment also recommended for back surfaces, of which previously folding edges were removed by milling or cutting. Another recommended pretreatment of back surfaces before the application of the adhesive is dedusting.

Such procedures are widespread, although they are relatively expensive in terms of device and procedurally also have at least two disadvantages: first they generate a very high amount of waste, in the form of milling chips accumulates and must be sucked out of the process, and secondly lose the individual sides of each sub-product by milling their inherent Connection, which was given by the folded edge, such that the adhesive connection must be significantly stronger than if the individual pages at least partially connected to each other via folded edges.

According to the two procedural disadvantages mentioned above other known methods are countered by the fact that not the entire back surface is milled off, but only partial areas of which partial areas over the entire back width (direction of the thickness of the finished product) extend and usually more or less regularly over the Back height (length of the bonded together by the adhesive back Sub-product edges) are distributed (see e.g. GB-A-2 096 945). Glued sections of this type work within each multi-layer part product such as staples or staple threads, with the folded sheets also only in certain places be connected to each other. Remain between the glued areas the folded edges and thus the cohesion of two sides in the finished Product exist, which cohesion with the stability of the end product contributes.

In a similar way, procedures work according to which by the multilayer Folded edges are drilled or pricked and into the openings made in this way Glue is introduced. Such glue points also act like Stitches (adhesive stapling) and hold the individual layers of the partial products together in such a way that these tack-tacked sub-products in a subsequent Process step or with an integrated in the adhesive booklet step Back glueing with an adhesive back and thus together get connected. Adhesive stitching processes are described, for example in publications EP-0628429, EP-0664226 and EP-0662440. According to publication EP-390734 the adhesive also shot through the layers without using a tool Opening must be made.

Further in publications EP-390733 (or US-5350268,) and EP-409770 (or US-5193851,) described a method in which a Plurality of simply folded products is collected, with between the individual folding steps, the outermost fold edge with adhesive is dealt with so that it is positioned on it in the following collecting step Folded edge adheres to it, resulting in the formation of booklet-shaped partial products can be put together into a partial product by being folded like simple Sheets with an adhesive back.

All described methods for producing adhesive backs for connection of partial products with multilayer folded edges are quite complex and sometimes only applicable to very specific sub-products. It is therefore the object of the invention, a method and an apparatus for connection to create partial products using adhesive backing, with which in one significantly simpler type of partial products with multilayer folded edges are interconnectable. Method and device should a high performance processing to Connection of partial products with a multi-layer Allow folding edge and they should be products result in terms of quality that produced according to the prior art Products are at least equal and in particular at least can be opened equally well.

This object is achieved by the method and the device as it is are defined in the claims.

The method according to the invention is based on gluing connecting folding edges of the stacked partial products with a tearing tool (as opposed to a cutting tool Tool) to be treated in such a way that multilayered folded edges at least be torn up completely in some areas. By tearing arise Edge areas to be glued, which consist of fibers that only partly stick in the bond of the paper and over the effective paper edge protrude. These fibers not only anchor the sheets to be glued well in the adhesive of the adhesive backing but also make a glued area which is thinner and more flexible than the whole paper layer, which makes that done glued product can be opened better.

By choosing the right tool and by appropriately establishing the relative movement between tearing Tool and edges to be treated can change the properties the treated edges to be glued are advantageously influenced, in that the fibers of the edge area after treatment with the tearing tool as complete and orderly as possible over the Protruding paper edge.

Figur 1

in schematischer Darstellung das erfindungsgemässe Verfahren anhand von aufeinanderfolgenden Phasen eines beispielhaften entstehenden Produktes mit Kleberücken, das aus einer Mehrzahl von mehrseitigen Teilprodukten hergestellt wird;

Figur 2

eine mit einem reissenden Werkzeug behandelte Blattkante in einem grösseren Massstab;

Figur 3

einen Schnitt durch einen nach dem erfindungsgemässen Verfahren hergestellten Kleberücken;

Figuren 4a bis 4c

drei verschiedene beispielhafte Kleberücken hergestellt nach dem erfindungsgemässen Verfahren;

Figur 5

eine beispielhafte Ausführungsform der erfindungsgemässen Vorrichtung zur Durchführung des erfindungsgemässen Verfahrens mit einer rotierenden Bürste als reissendem Werkzeug;

Figur 6

eine weitere beispielhafte Ausführungsform der erfindungsgemässen Vorrichtung mit einer Mehrzahl von rotierenden Büsten als reissendes Werkzeug;

Figur 7

eine weitere beispielhafte Ausführungsform der erfindungsgemässen Vorrichtung mit einer Mehrzahl von gezahnten Scheiben als reissendes Werkzeug.

The method and the device according to the invention are to be described in more detail with reference to the following figures. Show:

Figure 1

a schematic representation of the inventive method based on successive phases of an exemplary product with adhesive backing, which is produced from a plurality of multi-sided part products;

Figure 2

a sheet edge treated with a tearing tool on a larger scale;

Figure 3

a section through an adhesive back produced by the inventive method;

Figures 4a to 4c

three different exemplary adhesive backs produced by the inventive method;

Figure 5

an exemplary embodiment of the device according to the invention for carrying out the method according to the invention with a rotating brush as a tearing tool;

Figure 6

a further exemplary embodiment of the device according to the invention with a plurality of rotating busts as a tearing tool;

Figure 7

a further exemplary embodiment of the device according to the invention with a plurality of toothed disks as a tearing tool.

FIG. 1 schematically shows the method according to the invention on the basis of a representation of successive stages of an emerging product with adhesive back, which is produced from a plurality of multi-sided partial products, each consisting of three sheets folded into one another. The figure can also be understood as a schematic snapshot of a continuous process in which a multiplicity of products being produced are continuously guided past various processing tools in the conveying direction F and are pretreated on a back surface, provided with adhesive and a backing strip and pressed.

In the inventive method, a stack 1 of, for example, four folded sub-products introduced by suitable holding means 3, the stacked partial products being arranged with folded edges lying against one another and the folded edges are to be processed into an adhesive back Form back surface 2. The stack 1 of partial products is used for pretreatment the back surface 2 on a tearing tool 4 conveyed past, which is for example a rotating brush, the tearing Tool 4 is arranged such that its effect has a depth which extends at least to the innermost layer of the folded edges.

Due to the action of the tearing tool the folded edges arranged on the back surface 2 are torn open.

The rotating tool is advantageously driven in this way (Arrow R) that it corresponds to the direction of conveyance F of the product being produced Synchronous running This direction of rotation causes the fibers of the torn Edge areas combed out of the edge areas, whereby the advantageous effect is further enhanced (see also Figures 2 and 3 and associated description).

Fibers removed from the back surface by tearing and combing extracted with suitable means 5 and / or mechanically from the tool 4 removed.

The pretreatment with the tearing tool results in the Stack 1 of folded partial products a stack of partial products with torn open Edges, for example a stack of single sheets with torn ones Edges that form the pretreated back surface 2 of the part product stack. A suitable means 7 is applied to this pretreated back surface 2 Adhesive 8 applied through which the torn edges together a glued back. If necessary, on the adhesive a back strip 9 applied and with a suitable press 10 are pressed (arrow P). For curing or drying if necessary, the adhesive 8 is also to be supplied with heat.

Variants of the back stripe 9 shown in Figure 1 are on the Back-reaching cover pages or pairs of cover pages. The cover of the glued back with a back strip is a measure for improvement the aesthetic impression of the finished product. This measure can of course also be omitted in such a way that the glued Back on the finished product as such is visible

It can also be seen from FIG. 1 that the method according to the invention not only for connecting a plurality of sub-products but also for Connection of the individual layers of a single multi-layer sub-product is applicable, the method according to the invention being a Stitch takes over.

The method according to the invention is characterized by the pretreatment the back surface 2 of the stack of partial products while the others Steps for creating the adhesive back are known per se. It appears, that after pretreatment with the tearing tool no further pretreatment steps are necessary, that is, directly after the pretreatment of the adhesive can be applied. The end product of the process is a multi-page one Printed product 12.

FIG. 2 shows, on a significantly larger scale, a sheet 20 of paper or of another fiber-containing material in the region of a torn edge 21, which is exceeded by fibers 22 combed to the outside over the edge, while the fibers in sheet 20 are essentially undirected themselves . By tearing away part of the fibers from the edge area and by aligning the fibers remaining in this area, an edge area which tapers towards the outside is produced, as is shown in FIG. 2.

FIG. 3 schematically shows in cross section to the main surfaces of the sheets a plurality of sheets 20 which are held together by an adhesive back 23. This figure clearly shows how the adhesive 8 essentially holds the tapered edge regions of the sheets 20 together. Because of the tapering of the edge areas, these are also more flexible than cut, that is, non-tapering edge areas, and thus make it easier to open the bound product. However, because of the orientation of the fibers (see FIG. 2) in the edge areas bound in the adhesive back, the mechanical strength is not significantly reduced, so that tearing of a sheet from the adhesive back is not promoted.

FIGS. 4a to 4c show various exemplary back surfaces 2a to 2c as can be produced by the method according to the invention. The back surfaces 2a to 2c have a width d and a height h, the edges of the partial products running parallel to the height h. The back surface 2a according to FIG. 4a has a pattern of bound areas 40 alternating with unbound areas 41. The bound areas extend across the entire back width and over part of the back height. In these areas, the part product edges are pretreated and glued with adhesive. In the unbound areas 41, the folded edges of the partial products are unchanged, that is to say in these areas the folded parts are still connected to one another, which contributes significantly to the stability of the bound product.

The back surface 2b according to FIG. 4b shows more and narrower bound ones Areas 40, but do not differ in principle from the back surface 2a according to Figure 4a. Figure 4c also shows a back surface 2c with narrow bound areas 40 that are not parallel to the back width d, but crooked to get lost. It can be seen that adhesive backs according to FIG. 4c are advantageous are flexible and can be produced with a minimum of adhesive. Variants too with intersecting, obliquely bound areas are conceivable.

FIG. 5 shows, limited to the most essential, an exemplary embodiment of a device for carrying out the method according to the invention. This device has a tearing tool in the form of a rotating brush 50, the axial extent of which is substantially the same as or greater than the back height of the stack 1 of partial products conveyed past it with the appropriate conveying means (not shown) in the conveying direction F. The brush 50 is arranged in such a way that its axis A is aligned essentially parallel to the back surfaces 2 to be treated and that the distance between the back surfaces 2 of the incoming products 1 and the brush axis A is smaller than the brush radius, essentially by that Depth of the folded edges (see Figure 1). The direction of rotation R of the brush 50 is advantageously set up in such a way that the brush is operated in synchronism with the conveying direction F; it is also possible to operate in the opposite direction. The brush 50 is advantageously a wire brush.

The illustration according to FIG. 5 relates to the pretreatment of stacks 1 of sub-products in a high-performance flow, that is thus conveyed with main surfaces oriented transversely to the conveying direction F. become. For pretreatment of products that are parallel to the conveying direction main areas and back heights are promoted the brush perpendicular to the heights of the back surfaces conveyed past align. In any case, the axis of the rotating brush is in to be arranged essentially transversely to the conveying direction.

FIG. 6 shows a bird's eye view of a device with three coaxially arranged, rotating busts 51, on which the back surfaces 2 of stacks 1 of partial products conveyed in the conveying direction F are conveyed past and pretreated in three areas 40.

FIG. 7 also shows a bird's eye view of a device for producing adhesive backs according to FIG. 4c. A plurality of disk-shaped tools 70 are provided for the tearing pretreatment of the back surfaces 2, for example toothed disks, which are arranged coaxially or with parallel axes A, the conveying direction F running perpendicular to the tool axis A and the heights of the back surfaces 2 being oriented obliquely to the disks 70 are.

Figures 5, 6 and 7 show in a very simplified manner devices such as those for Pretreatment in a high-performance flow (direction F) subsidized stacks 1 of sub-products are used in which thus conveyed past it with an essentially stationary tool Back surfaces 2 are treated. As mentioned earlier, are also in another arrangement continuously conveyed products in analog Way pretreatable. Arrangements are also conceivable in which essential stationary products can be handled with moving tools or arrangements in which both tools and products are translational Carry out movements, being a relative movement between products and tool arises.

Claims (9)

1. A method for producing multi-page printed products with a glued spine from one multi-page subproduct with one multi-layer folded edge or from a plurality of stacked subproducts of the same kind, whereby an adhesive (8) is applied to a spine surface (2) of the of one subproduct or stack of subproducts which spine area is formed by a multi-layer folded edge or by a plurality of superposed multi-layer folded edges characterized, in that the spine surface (2) is pre-treated with a tearing tool (4) before application of the adhesive (8).
2. Method according to claim 1, characterized, in that the tearing tool (4) is a rotating brush (50) or a plurality of rotating brushes (51) or a plurality of cogged discs (70) and in that for the pre-treatment the spine area (2) is conveyed past the tool (4) in a conveying direction (F) resulting from a relative movement between spine area and tool.
3. Method according to claim 2, characterized, in that the rotating tearing tool (4) works in the same direction (F) as the product is conveyed.
4. Method according to claim 1 or 2, characterized, in that the folded edges forming the spine area are pre-treated over their whole length or in portions (40) spread over their length which areas alternate with portions (41) which are not pre-treated.
5. Method according to claim 4, characterized, in that the pre-treated portions (40) extend across the width (d)of the spine area (2)at a right or an oblique angle.
6. Device for manufacturing of multi-page printed products with a glued spine from a multi-page subproduct or from a stacked plurality of such subproducts, whereby an adhesive is applied to a spine area (2) of the subproduct or stack of subproducts using the method according to claim 1, which spine area is formed by a multi-layer folded edge or a plurality of superposed multi-layer folded edges, which device comprises at least one holding means (3) for holding a stack (1) consisting of a plurality of stacked subproducts or for holding one subproduct and means (7) for application of an adhesive (8) to the spine area 2, characterized, in that the device for pre-treatment of the spine area (2) comprises no other tool than at least one tearing tool (4).
7. Device according to claim 6, characterized, in that the tearing or roughing tool (4) consists of a plurality of rotationally driven brushes (50, 51) or of a plurality of driven cogged discs (70), whereby the at least one holding means (3) and the tool (4) are moveable against each other in a relative movement such that the tool (4) is movable over the spine area (2) of the stack (1) or subproduct by the at least one holding means.
8. Device according to claim 6 or 7, characterized, in that the holding means (3) is a conveying means with which a plurality of stacks of subproducts or of individual subproducts are movable in a conveying direction (F) through the effective range of the tearing tool (4) which is substantially stationary.
9. Device according to claim 7 and 8, characterized, in that the rotating tearing or roughing tool (4) is connected to a drive such that it works in the same direction (R) as the product is conveyed.

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