EP1958789A2 - Method and device for the adhesivle binding of book blocks - Google Patents

Abstract

A book-blocks (2) binding method involves a feed device (5) for holding the book-blocks which are comprised of several folded sheets and/or pages, and in which molten adhesive is applied to the spines of the books. For successive individual treatment of the book-blocks following application of the adhesive the applied adhesive is treated with cooled air so that the respective subsequent treatment takes place exactly in the required adhesive film-forming phase. Independent claims are included for the following. (1) (A) A device for carrying out the method (2) (B) Application of the method for an adhesive binder.

Description

The invention relates to a method and a device for the adhesive binding of book block held in a conveyor and formed of several folded sheets and / or sheets, in which molten adhesive is applied to the block back.

The adhesive binding of book blocks represents a cohesive bonding method in which by joining the gathered sheets or sheets by applying a special adhesive on the block back creates a permanent connection. Disperse, hot melt or polyurethane adhesives are applied by roller or die gluing units. For the transfer of closed adhesive films of sufficient thickness, multilayer, i. successive adhesive applications advantageous, the different types of adhesive can be combined.

In the textbook [Dieter Liebau, Inés Heinze / Industrial Binding / Publishing Profession + School, 2001] on page 305 ff the mechanical engineering of perfect binders is described. As conveyors for the book block Plattenketten- and reciprocating or revolving stapler systems are known. After the transfer of the collated book block into the conveyor, the book block passes through one or more back processing stations. This is followed by one or more glue applicators. From a Umschlaganlegestation the enamelled on the back and possibly back side surfaces book block an envelope is fed and placed with a pressure to the block back and pressed firmly. Adhesive binders can have a folding station arranged in front of the cover application station, with which strips can be applied in a slightly greater width than the block back on the same, in order then to be pressed against the pressing station.

An important parameter in the processing of hot melt adhesive (hot melt or polyurethane adhesive) is its adhesive-open time, within which the attachment of the envelope on the glued block back has to be made to ensure a secure and permanent bonding. It depends on the composition of the adhesive, its application temperature and thickness as well as the material properties of the adhesive (eg thermal conductivity). On the machine side, the required, adhesive-open time by the distance between the glue applicator and the Umschlagandrückstation and the Machine speed set. To extend the adhesive-open time, infrared radiators can be installed between the last glue application unit and the pressing station as a warm-holding line for the block backs glued with hot-melt glue. A disadvantage of the relatively sluggish infrared heaters is that a machine-speed changes a demand-based heat supply for exact compliance with the respective adhesive-open time is not given.

On the other hand, in addition to the heat retention of the hot melt adhesive applied, the acceleration of its curing process is of interest in order to enable the fastest possible further processing. A rapid cooling is, for example, required if expired book block to be performed without attaching a hot melt adhesive covering the cover or envelope from the conveyor of the perfect binder. Are known along the conveyor line arranged, ambient air blowing against the glued block back blower. However, their efficiency is limited when the perfect binder is operated under warm ambient temperatures. Also known is the bringing of water to the glued block back, for example. With a converted this rewinder, whereby the adhesive film should be quenched and pressurized without sticking. However, there is a risk of excessive water absorption through the book block, which can lead to the formation of waves in the book block.

The problem with adhesive binding is that in the case of a not or incorrectly supplied envelope or Fälzels the conveyor for removal of the associated book block must be stopped so that downstream pressing elements do not get in contact with the open adhesive of the book block in question and thereby dirty.

It is an object of the present invention to provide a method and apparatus for adhesive bonding book block held in a conveyor and formed of multiple signatures and / or sheets, wherein molten adhesive is applied to the block back which enables To influence the cooling process of the applied hot melt adhesive specifically to ensure a secure and permanent bonding at different conveyor speeds of the book block. Another object is to allow continued operation of the conveyor in irregular operating conditions.

This object is achieved in that for an adhesive application subsequent individual treatment of the book block of the applied adhesive cooled air is acted upon in such a way that an adhesive film formation phase required for the respective subsequent treatment is formed precisely in time. The invention goes new ways by the adhesive-free time of the applied adhesive is not extended as before by heating elements but is shortened by the application of exactly metered cooling air. Due to the targeted, accelerated cooling and thus shortening the adhesive-open time, a certain hot melt adhesive, which is provided due to its embossed, relatively long adhesive open time for slow conveyor speeds of the book blocks, even for high conveying speeds and thus short machine-open times are used, so that a change of adhesive during Operation of the conveyor in different speed ranges can be omitted and still a secure and permanent bonding is guaranteed.

The above-mentioned factors influencing the open time of the adhesive, in particular the application temperature and the thickness, can be determined with a view to optimum gluing, while the selective application of cooling air is available as a regulator for the desired open time.

An apparatus for carrying out the method according to the invention consists of a Kühlluftzuführvorrichtung downstream of the gluing device, acting on the adhesive applied and an associated control device for detecting and setting a required intensity level of the supplied cooling air with a view to a timely formation of a desired adhesive film forming phase for subsequent treatment of the book block.

To increase the adhesive cooling, moist cold air could be passed to the applied adhesive.

Appropriately, the Kühlluftbeaufschlagung could be done with respect to their intensity level depending on the book block conveyor speed.

The application of cooling air could take place between two consecutive adhesive applications, whereby a first low-viscosity adhesive application is solidified to such an extent that a high-viscosity adhesive can be applied in a subsequent application.

The applied adhesive could be acted upon by cooling air so intensively that it can then be pressurized without sticking, so that the glued block back can be contacted by conveying, guiding and / or pressing elements.

Preferably, the intensive application of cooling air takes place in the event that an envelope and / or rabbet to be glued to the block spine and / or rear side surfaces is not or is incorrectly fed, so that the conveyor no longer has to be stopped.

With the advantage of effective cooling, the cooling air supply device is connected to a cooling air generator. Preferably consisting of one or more vortex tube designed as cooling nozzles, which allow easy regulation of the cooling air intensity level by varying their throttle width.

For moistening the cooled air, the cooling air supply device comprises a steam lance or the like. Moistening device.

Preferably, the volume flow and / or the temperature of the supplied cooling air can be adjusted and adjusted with the control device.

Advantageously, the evaluation of relevant production parameters, such as adhesive application thickness, temperature, product formats, conveying speed, etc., as well as the current operating conditions by the controller, for determining and setting the respective applied cooling air intensity level and / or for switching on and off the Kühlluftbeaufschlagung.

The cooling air supply device preferably has a cooling air distributor which can be adjusted in accordance with the book block thickness to be loaded.

The method according to the invention is used on an adhesive binder or a bander for the production of books or brochures.

Fig. 1

einen Klebebinder zur Herstellung einer klebegebundenen Broschur in vereinfachter perspektivischer Ansicht;

Fig. 2

den Aufbau einer Kühlluftzuführung.

The features of the present invention will be explained in the following description of a preferred embodiment with reference to the accompanying drawings listed below. Show it

Fig. 1

an adhesive binder for producing a bound booklet in a simplified perspective view;

Fig. 2

the structure of a cooling air supply.

Fig. 1 shows in simplified view an adhesive binder 1, which has a conveyor 5 with a plurality of in a closed, oval-shaped orbit continuously movable and drivingly interconnected book block pliers 6, with an import 7 for feeding the folded sheet book block 2 to the book block pliers 6 and with an export 16 for performing the bound booklets 4 or book block.

Along a first rectilinear conveying path of the conveyor 5, devices for back processing 8, for back gluing 9.1 and 9.2 and for side gluing 10 of the book block 2 are arranged. Along the second rectilinear conveyor line there are an envelope feed 11 and at least one Umschlaganpressung 15. Envelopes 3 are separated from a magazine 12 and fed to a creasing device 13. The envelope 3 provided with at least a double grooving 3 a is transferred to a two parallel juxtaposed conveyor belt 14 a with carriers 14 b formed envelope conveyor 14 and transported by this up to a pressure roller 15 a, the envelope 3 to the glued spine of Book block 2 presses. The pressure roller 15 a subsequently press circumferential pressure rails 15 b the envelope 3 on the back and back side surfaces firmly.

According to the invention, the perfect binder 1 is equipped with cooling air feeds 21, 22, 23. With them, the applied adhesive can be applied to the block back so cooled air that forms a required for the respective subsequent treatment adhesive film forming phase accurately. In Fig. 1 For the sake of clarity, only the end-side cooling-air distributors 20 are shown in order to illustrate the different positions of the cooling-air supply lines 21, 22, 23 along the conveyor 5.

The structure of a cooling air supply 21, 22, 23 results from Fig. 2 , As a cooling air generator formed as a vortex tube cooling nozzles 24 are used, also called Hilsch tubes. They are acted upon by compressed air P introduced tangentially into the pipe. The result is a vortex around the tube axis, which escapes only partially at one end of the cooling nozzle 24 via a throttle. The rest, still swirling air is forced inside the first vortex to the other end of the cooling nozzle. It cools down by more than 28 ° below the supplied compressed air temperature, wherein the heat is released to the outer air vortex and discharged via the flow of air derived through the throttle from the cooling nozzle 24.

The cooled air passes via conduit 25 to the associated, adjustable block thickness cooling air distributor 20, where the cooling air flow V _{KL is passed} to cool the applied adhesive over the block thickness distributed against the glued block back. An increase of the adhesive cooling can be achieved by humidifying the cooled air by a steam lance 27 supplied with steam W.

For targeted application and thus defined cooling of the adhesive of the respective cooling air supply 21, 22, 23 is associated with a controller 28 which acts on the temperature and the volume flow determining throttle setting 24 a of the cooling nozzle 24 and also a valve 26 in the conduit 25 switches.

In the controller 28, the switching and actuating signals are determined by evaluation of relevant, provided by a parent controller 29 of the perfect binder 1 production parameters, such as production, adhesive application thickness, temperature, product formats, conveying speed, etc., determined. In this case, the respective current operating conditions of the perfect binder 1 are taken into account. Exemplary possible uses of the cooling air supply 21, 22, 23 are listed below:

The arrangement of a cooling air supply 21 between a first and second Rückenbeleimung 9.1 or 9.2 (two-shot Beleimsystem) allows targeted intercooling of the first glue application, whereby a first low-viscosity adhesive application is solidified so far that in a subsequent order, a highly viscous adhesive can be applied without the first application of adhesive being removed from the block back by the second application. The applied with the first spine gluing order can be increased.

Another possible use of the cooling air supply according to the invention lies in the defined setting of the adhesive-open time. Instead of extending them by heating the block spine, it is shortened by the application of precisely metered cooling air and adapted to the respective cycle performance and thus conveying speed of the perfect binder 1. For this purpose, a cooling air supply 22 may be arranged in the deflection of the conveyor 5 immediately before the envelope feed 11.

By installing a particularly powerful cooling air supply 22, for example. By multiple arrangement of cooling air manifolds 20, such intensive cooling Luftbeauf can be achieved regimens that the applied adhesive is then pressurizable without sticking. Such intensive cooling air admission may be made on a case by case basis, e.g. a with the book block 2 to be glued envelope 3 is not or incorrectly supplied. The conveyor 5 then no longer has to be stopped to protect the Umschlaganpressung 15 from contamination.

A similar effect achieved an arrangement of the cooling air supply 23 along the second rectilinear conveying path. The adhesive application of only abgeseimten book block 2 is solidified smear-proof, so that the abgeseimten book block 2 in the export 16 of the perfect binder 1 can be delivered without consequences to subsequent transport systems.

Similar applications arise when the perfect binder 1 would be equipped with a Fälzelstation after side gluing. In addition to the embodiment set forth on an adhesive binder 1 with an oval-type stapling carriage, the method according to the invention can also be applied to rotary travelers or linear binders or leveling machines equipped with plate-and-plate transport systems.

LIST OF REFERENCE NUMBERS

1

Perfect binder

2

book block

3

envelope

3 a

Rückenrillung

4

Paperback

5

Conveyor

6

Book block clamp

7

import

8th

spine preparation

9.1

First back gluing

9.2

Second back gluing

10

side gluing

11

envelope feeder

12

magazine

13

scoring device

14

envelope conveyor

14 a

conveyor belts

14 b

takeaway

15

Umschlaganpressung

15 a

capstan

15 b

pressure pads

16

export

20

Cooling air distribution

21

First cooling air supply

22

Second cooling air supply

23

Third cooling air supply

24

Vortex tube cooling nozzle

24 a

throttle setting

25

Pipeline

26

Valve

27

steam lance

28

Control cooling air

29

control

V _KL

Cooling air flow

P

compressed air

W

steam supply

Claims (14)

Process for the adhesive bonding of book block (2) formed by a plurality of folding sheets and / or sheets and held in a conveying device (5), wherein molten adhesive is applied to the block back, characterized in that, for an individual treatment of the book block (2 ) the applied adhesive is subjected to cooled air in such a way that an adhesive film formation phase required for the respective subsequent treatment is formed precisely in time. A method according to claim 1, characterized in that moist cold air is passed to the applied adhesive. A method according to claim 1 or 2, characterized in that the Kühlluftbeaufschlagung takes place with respect to their intensity level as a function of the book block conveyor speed. Method according to one of claims 1 to 3, characterized in that the cooling air is applied between two successive adhesive applications. Method according to one of claims 1 to 4, characterized in that the applied adhesive is so intense acted upon by cooling air, that the applied adhesive is then pressurisable without sticking. A method according to claim 5, characterized in that the Kühlluftbeaufschlagung takes place in the event that an envelope (3) and / or Fälzel to be glued to the block back and / or back side surfaces is not or incorrectly supplied. Apparatus for carrying out the method according to one of claims 1 to 6, comprising at least one gluing device (9.1, 9.2) arranged along the conveying device (5) of the book block (2) for applying molten adhesive to the block back, and with a pressing station (15) for Moving and pressing an envelope (3) and / or Fälzels glued on the block back, characterized by the Beleimeinrichtung (9.1, 9.2) downstream, on the applied adhesive acting cooling air supply device (21, 22, 23) and associated control means (24 a, 26, 28) for detecting and setting a required intensity level of the supplied cooling air with a view to a time-accurate formation of a desired adhesive film forming phase for subsequent treatment of the book block (2). Apparatus according to claim 7, characterized in that the cooling air supply device (21, 22, 23) with a cooling air generator (24) is connected. Apparatus according to claim 8, characterized in that the cooling air generator consists of one or more cooling elements formed as a vortex tube (24). Device according to one of claims 7 to 9, characterized in that the Kühlluftzuführvorrichtung (21, 22, 23) comprises a steam lance (27) o. The like. Moistening device for humidifying the cooled air. Device according to one of claims 7 to 10, characterized in that the volume flow and / or the temperature of the supplied cooling air can be adjusted and adjusted with the control device (24 a, 26, 28). Device according to one of claims 7 to 11, characterized in that by the control device (28) relevant production parameters, such as adhesive application thickness, temperature, product formats, conveying speed, etc., as well as the current operating conditions in evaluation, for determining and setting the respective applied cooling air intensity level and / or for switching on and off the Kühlluftbeaufschlagung. Device according to one of claims 7 to 12, characterized in that the Kühlmittelzuführvorrichtung (21, 22, 23) has a corresponding book block thickness adjustable cooling air distributor (20). Application of the method according to claims 1 to 6 to an adhesive binder or a bander for the production of books or brochures.

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