RU1828437C - Method and device for binding paper sheet packs - Google Patents

Abstract

The method for binding bundled paper sheets 13 is based on an injection of adhesive into the paper sheets. This injection 15 of adhesive can consist of pressing the adhesive into the paper sheets which have been previously perforated by needles 22, the perforation being undertaken either in advance or in the same work process by means of injection by hollow or channelled needles 22. Another possibility of injection 15 of adhesive is based on the inclusion of drops of adhesive. The subsequent treatment 16 of the paper sheets can consist of pressing and/or the effect of ultrasound. If appropriate, the injection of adhesive is undertaken only into the inside sheets 52 of the paper sheets 13 without a cover sheet 51 and centre sheet 53. <IMAGE>

Description

The invention relates to methods for bonding stacks of paper sheets and to a device for implementing this method.

The aim of the invention is to simplify the bonding process, i.e., it is an object of the invention to provide a method for simultaneously gluing stacks of paper sheets that would not have the disadvantages of notching a spine before glueing or glueing individual sheets before joining.

This problem is solved by the fact that glue is locally sprayed into stacks of paper sheets. The glue is sprayed either after preliminary perforation of the stacks and application of the glue through the hollow

either cannulated needles or by direct drip into stacks of paper sheets.

Spraying the adhesive allows bonding of the stacks by analogy with sewing with shields or wire after trimming and arranging individual sheets, and if necessary even after folding.

Thus, the proposed method has significant differences from existing methods of adhesive bonding, in which the adhesive is applied to the trimmed root. These classical methods allow optimal preparation of adhesive material, for example, by applying scars, and the open root allows the use of additional acceleration methods.

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It is not possible to dry the glue by applying heat air, irradiating, etc. But, as already stated, applying glue to the spine requires a lot of preparatory work.

The new method of spraying the adhesive means also differs significantly from the written gluing in the seam. According to the latter, individual sheets are individually lubricated and careful care must be taken to ensure that there is no uncontrolled contact with the adhesive material for bonding, whereas in the new method the adhesive is applied to a pile of sorted and ordered stock.

Various embodiments of a method for spraying an adhesive are provided, for example, the adhesive can be sprayed into a stack after being pre-punched or introduced into the stack as drops.

 Putting the adhesive into the stack in the form of drops is a new principle. It is based on the water jet cutting method, which is heavily used to separate solid materials (stone, metal, wood, plastic).

The method consists in first bringing the water to a pressure of several kilobars and then supplying pulses to the cutting nozzle. The ejected droplets have an initial velocity of 600-1000 m / s.

Water jet cutting studies have been conducted. Against expectation, a short distance falling onto the stacks of paper sheets of water, after a short distance, breaks up, and the substance penetrates between the stacks, which swell as a result. Poor crop quality is obtained. Therefore, it is not surprising that water jet cutting has not been used in the paper industry. Therefore, the use of such a method for gluing paper stacks is not obvious. The disadvantages associated with cutting a paper with a water jet (wetting, swelling and splitting of the material into fibers) were found to be desirable with respect to bonding.

Both options for spraying the adhesive have the following advantages over wire sewing:

no wear mechanisms are needed to force and bend staples requiring precise alignment. All that is needed is a slight pressure on the bonded material in the area of the bonding points;

other than paper, no storage or feeding of any other materials (wire for brackets) is required;

the method is very good with regard to recycling, since no foreign materials (wire brackets) are introduced into the paper. The need for glue is very small;

simultaneous processing of multilayer products is possible;

by wetting the fold portion with an adhesive, the possibility of folding is increased.

0 Various side operations that were indicated as desirable with adhesive bonding, for example, drying in a stream of air, are not indicated for 5 seconds due to the new method of spraying the adhesive, since the bonding points are closed.

FIG. 1 is a schematic diagram of a printing press for mass production of a printed product with a device for spraying adhesive into piles

paper sheets; in FIG. 2 and 3 - principle

two-stage device for realizing the injection of adhesive with

a perforation step (Fig. 2) and a waki burst 5 (Fig. 3); in FIG. 4 - corresponding single-stage device; in FIG. 5 is a device for drip input into stacks of paper sheets; Fig. 6 is a principle and apparatus for separately treating a top and middle sheet by spraying an adhesive.

In FIG. Figure 1 shows an example of a printing machine with a device for spraying adhesive into stacks of paper sheets. From the paper roll 1, the paper enters the printing device 2, which can consist of several stages of printing and contains a cutting device 3. The printed material is arranged and in the form

0 of the collected stacks of 4 paper sheets are transported further, if necessary in cascade bundles 5. Then, the printed material enters the device b for spraying the adhesive.

5 Spraying can be done by pre-perforating followed by spraying or by drip. After this, the cascade packs 5 enter the device 7 for further processing. The bonded product is discharged from the receiver 8.

In FIG. 2, 3, a first embodiment of an apparatus for spraying an adhesive into stacks of paper sheets is shown. On the

5, for example, in the form of ridges, there are needles 10, which perforate II (Fig. 2) stacks 4 under the action of press 12. Perforation, if necessary, can be carried out at the same time using the needle crest 13.

in which a certain number of needles 10 are located on the bar 9, and sequentially with the help of one single or several needles 10. After perforation, the adhesive from the reservoir L4 is applied using the injection device 15 (Fig. 3). To this end, the adhesive means is either directly injected into the perforation holes 11 or the needles 16 are hollow or cannulated (Fig. 4). Piles 4 during punching as well as for gluing the adhesive are pressed with the aid of a pressing device 17 to the coyt support 18, therefore, both the puncture and the removal of the needles take place without hindrance.

As shown in FIG. 4, depending on the properties of the stacks, it is possible to perforate and spray during the same operation. This is possible if the adhesive is sprayed when perforated using hollow or cannulated needles 16.

Another option for spraying the adhesive is to break the stack with drops of liquid. As already mentioned, this method is based on the principle of cutting with a water jet.

In FIG. 5 is a diagram of a device used for cutting with a water jet. A pressure-enhancing piston 20 is located in the cylindrical body 19. As a result of its hydraulically controlled movement, the fluid entering through the valve 21 is pulsed under pressure of several kilobar pulses through the nozzle 22 into the material being processed. Shot drops have an initial speed of 600-1000 m / s.

The stacks 4 are pressed using the clamping device 17, therefore, the kinetic energy of the droplets is not used to mechanically move the stacks 4, but to break them through. The pressing leads to the fact that the piles acquire a consistency like a tree (a tree, for example, plywood, is very well cut by a water stream).

Obviously, water, even if it contains a bit of glue, can break through the stack in place of the fold. The stacks 4 are slightly moistened. When a dispersed or colloidal additive is added to the cutting water, the adhesive material penetrates the stack. Since only a small amount of adhesive material is required, the concentration of adhesive in the water stream can be very low, which prevents clogging and erosion of the nozzle.

In both cases, when the adhesive is sprayed, they take place more locally.

consequence of damage to the stacks. These damage can be made invisible, since the covering sheet of the notebook and, if necessary, the middle page of the overlay 5 are released after the adhesive is sprayed. Adhesive protruding from the holes, in subsequent operations, provides adhesion of the covering and middle sheets. In FIG. 6 shows the corresponding device.

The cover sheet 23. The inner pages without the middle page forming the bundle 24, as well as the middle page 25, are supplied separately. Adhesive is sprayed onto pack 24 in this manner. Then, the three components 23,24 and 25, for example, are connected and processed by means of a device 7, 18 for further processing.

0 With very economical use of the adhesive, the glued points can be loaded by short-term pressing. Another effective means of drying, fixing and therefore increasing

5, bonding quality is the use of ultrasound, which has been successfully used to join plastics.

Improving the stackability of products can be ensured by that. that the fold is dampened slightly before or during folding. With this method, this operation is unnecessary, since humidification also occurs when the adhesive is sprayed.

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Claims (14)

The claims . 1. A method of fastening selected or bundled stacks of paper sheets 0 in the form of notebooks, brochures or books, which consists in applying a bonding agent to the sheets, characterized in that, in order to simplify the bonding process, the bonding agent is applied by 5 by spraying it through the stacks of sheets in a perpendicular direction when viewed from the plane side of the stacks of sheets, 2. A method according to claim 1, characterized in that the fastening means comprises 0 glue. 3. The method of hon. 1. characterized in that the foot is perforated to spray the fastener, while the fastener is sprayed during the period of the perforation of the foot or after perforation in the next work step. 4. A method according to claim 2, characterized in that the bonding agent is sprayed onto the stacks of paper sheets by punching drops of this agent. 5. The method according to paragraphs. 3 and 4, with the exception that the fastening means is sprayed through all the paper sheets bound into piles. 6. The method according to paragraphs. 3 and 4, with the exception that the bonding agent is sprayed into the inner sheets of the stack before being connected to the covering sheet and, if necessary, to the middle sheet. 7. A method according to one of paragraphs 5 and 6, which consists in the fact that after spraying . post-treatment is carried out to improve the quality of the fastening compound produced. 8. The method of claim 7, wherein the subsequent processing is carried out by exposure to ultrasound to strengthen the compound.  9. Installation for bonding selected or bundled stacks of paper sheets in the form of notebooks, brochures or books, comprising a unit for supplying bundles of sheets and an application unit for fastening means, which, in order to simplify the bonding process, includes the application of bonding means comprises a device for spraying the bonding means, the apparatus including an additional processing device for securing the bonding means applied to the bonded or pressed by means of a pressure fixtures and supports of a stack of paper sheets. 10. Installation according to claim 9, with the proviso that the device for spraying the fastening means is provided with needles to provide perforation of the stacks and paper sheets. 11. Installation according to claim 10, with the exception that the needles are hollow or have cannulas and are connected to the reservoir for fastening means. 12. Installation according to Claim 9, with the exception that the device for spraying the fastening means consists of a cylindrical body with a pressure-increasing piston and a supply valve for the fastening means and is arranged to interact through the nozzle on stacks of paper sheets. 13. Installation according to one of paragraphs. 9-12, characterized in that it has guides for orienting the stacks of paper sheets in such a way that the mouth; The adhesive spraying device is arranged to spray only on the inner pages without a covering sheet and, if necessary, without a middle sheet, which are connected to the rest of the sheets after the adhesive is sprayed. 14. Installation according to claim 9, with the proviso that the additional processing device for fixing the fastening means has an ultrasound acquiring means. ha fie, i 1/ / J pshbsh psh3 70 17  //// w /////////, f 8 F # g2 t //// P b ® S //// 77/37 // 7 ///// 77777 / Ф &amp; &amp; 4 U F # & s / J 7777 ////// Щ //////, 18 F # g5 T) /// 4 U t a GGT / / F&& V