JP3036781B2 - Method and apparatus for joining layers of bound paper - 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

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for bonding paper layers with an adhesive.

Methods of joining layers of paper have been known for decades.
They form an essential part of the bookbinding technique. With the advent of high-performance printing equipment capable of producing up to 100,000 copies per hour, there has been a need for renewal of the mechanical binding of paper layers.

Wire binding and tying with adhesives have proven to be satisfactory for binding large amounts of paper layers as required in printing operations. Wire binding is very important for binding printing materials in booklet or temporary binding format. Rotating wire stitchers have high efficiency but are relatively expensive. Up to 100 pages can be bound in one volume. In the case of a rotating wire stitcher, the clasp of the wire is pushed into the spread bundle of paper against the abutment, but does not have any locking mechanism. After binding, the paper is folded.

Single or individual wire stitchers have smaller capacities per unit time and are more expensive than rotating wire stitchers. However, the product can have more than 300 pages and each wire stitcher has an abutment with a locking mechanism.

The advantage of wire binding is the possibility of opening the booklet completely. There are no bound and folded edges covering the printed information portion. However, the disadvantage of wire binding is that the material is applied through the back clasp, which limits the stackability of the product. In addition, selection of appropriate wire material,
Additional costs are incurred by storage and processing. The reliability of wire binding is also limited, especially for thick paper layers with more than 200 pages.

Bundling with adhesive is yet another way to tie paper together.
In particular, it is used in bookbinding technology. When this method is used, the paper is first bundled, cut, and then its back glued. This method has been known for a long time, but it still has problems. Critical to the success of this binding method are, for example, the paper quality, the nature of the unit (text or text and photo), the nature of the adhesive (dispersed or hot melt adhesive) and the wettability of the printed paper. The drying rate is particularly critical in this method because its back gets wet. This is a function of the thickness of the applied adhesive, its absorbency and the degree of paper adhesion. For example, a stream of air or a high frequency electric field is used to speed up the drying. The adhesive can be applied at either low or high temperatures.

In order to increase the bonding surface, it has proven advantageous to provide grooves or depressions in the spine to be bonded by means of a cutter equipped with equidistant knives. It must be ensured that the adhesive applied as a melt or dispersion can be placed in an optimal manner at the edge of the paper.

Another bonding method is folding bonding. In this method, the individual paper layers are first individually applied with an adhesive or seam, such as a strip or spot, and then bonded under pressure. See, for example, German Patent No. 3527660C2. Folding glue allows up to 32 pages to be bonded simultaneously at normal printing speeds. However, this method requires additional operations, with complicated, individual guidance of the individual papers. In particular, it is necessary to ensure that the layers of paper prepared for bonding are not prematurely touched. In this connection, reference is made to an interesting solution by I. Kbler described in Swiss Patent No. 665389A5. Adhesive stains caused by cyclically pressing the paper web against the adhesive application roller are prevented by guiding the paper web by guide rollers or pulleys having corresponding depressions in the adhesive strip.

Another disadvantage of fold bonding is that the printed product cannot be completely opened at the fold. If the booklet and the temporary binding book have illustrations on both sides, the picture information may be lost.

Thus, the development of a method that allows simultaneous bonding of layers of paper without having to accept disadvantages such as opening the spine of a book before bonding or bonding individual pages before bonding. The problem exists.

This problem is solved by locally injecting the adhesive into the paper layer. Injection of the binder is carried out either following pre-perforation of the paper layer and application of the binder via a hollow or tubular needle or by directing the droplets directly onto the paper layer. Similar to thread binding or wire binding as a result of binder injection, the layers of paper can be joined after cutting and tidying the individual papers and optionally even after folding.

Thus, the proposed method is very different from the method of tying with existing adhesive, which is applied to the cut open spine. These standard methods make it possible, for example, to apply the adhesive in an optimum manner by applying grooves and open backs allow the adhesive to dry quickly, for example by supplying hot air, irradiating or otherwise, Back bonding, as stated, requires a significant amount of preparation.

The method of injecting the new binder according to the invention is also quite different from the folding adhesive described above. In the latter case,
Care must be taken that the individual papers are individually supplied with adhesive and prevent any uncontrolled contact with it before bonding, but in the new method the binder is sorted and tidy Applied centrally to stacks of paper.

There are various possibilities to carry out the binder injection method and the binder can be injected into the layer of paper, in particular after prior perforation, or can be poured onto said layer in the form of droplets.

The principle of exposing the paper layers to droplets of the binder is novel.
It is based on high water pressure water or fountain cutting methods and has been used successfully to separate solid materials such as rocks, metals, wood, plastics and the like. In this method, the water is first raised to a water pressure of a few kbar and intermittently conveyed to a cutting nozzle. The injected droplets have an initial velocity of 600 to 1000 m / s.

Fountain cutting of paper was studied. Contrary to expectations, the erupted water striking the paper layer dissolved the medium after a short distance, penetrating the paper layer and causing its expansion, followed by an unsatisfactory cut quality. It is therefore not surprising that the fountain cutting method has not gained any significance in the paper processing industry. The use of this method in connection with the binding of paper layers is therefore not obvious. However, the inadequate fountain cutting of paper, the disadvantageous consequence of wet, swelling and mottling of the material, is desired in the context of bonding or tying.

Compared to wire binding, the two embodiments of the binder injection method have a number of advantages. There is no need for a precisely adjusted, wear-prone mechanism for pushing and bending the clasp. It is only necessary to slightly press the adhesive in the area around the seam. With the exception of paper, no additional material (clasp wire) needs to be stored and supplied. This method is also very advantageous from the point of view of recirculation, since the paper does not involve external materials (wire clasps) and the amount of adhesive required is negligible. It is possible to process multiple products at the same time. The amount of folding can be improved by wetting the area to be folded with a binder.

However, various post-treatment methods, such as drying with an air stream, which have proven to be advantageous in connection with bonding with adhesives, are not suitable for new binder injection methods, since seams are not accessible. Because there is no.

According to the present invention, a method for bonding a layer of paper bound in the form of a booklet, a binding book or a book is provided by jetting a binder in the form of droplets containing an adhesive onto the layer of paper. It is characterized in that the binder is injected into the paper layer at the same time as the holes are opened.

According to this method, there is no need for a precisely adjusted, wear-prone mechanism for pushing in and bending the clasp as compared to wire binding. Further, since a mechanical punching operation is not required, the operation is simple, and the degree of weakening of the paper layer due to the punching caused by the droplets is smaller than that of the mechanical punching operation.

Preferably, the method according to the invention is characterized in that the binder is injected into all of the bundled paper layers.

Also preferably, the method of the invention is characterized by injecting the binder into the interior of the paper layer without the cover or without the middle page.

More preferably, the method according to the invention is characterized in that a post-treatment is performed after the injection of the binder.

In an apparatus according to the invention for bonding a layer of paper bound in the form of a booklet, a binding book or a book, the binder is injected into the layer of paper by spraying a droplet-like binder containing an adhesive. A binder injecting device is arranged in a manner operable on the bundled paper layers. The binder injection device includes a cylindrical frame having a booster plunger, a recharge valve for storing the binder, and a nozzle. A binder injecting device is arranged so that the binder can be injected into the bundled paper layer by injecting the binder through a nozzle.

According to this device, compared to wire binding, there is no need for a precisely tuned, wear-prone mechanism for pushing in and bending the clasp.

Preferably, the device further comprises a post-processing device (16).

Also preferably, the device further comprises a paper pressing device (27) for pressing the bundled paper layers and a butting table (28).

More preferably, the apparatus of the present invention presses the layers of paper bundled by the paper pressing device (27) toward the butting table (28), and then ejects the binder through a nozzle to form the bundle. The binder injecting device (15) is arranged so that the binder can be injected into the layer of paper (13).

Preferably, the apparatus of the present invention is arranged such that the layers of paper are directed and bonded such that the binder is injected only into the inner pages without the cover (51) or the middle page (53). A dosing device (15) is arranged, characterized in that, following the injection of the binder, the cover (51) or the middle page (53) can be bonded to the remaining paper layer.

Also preferably, the apparatus of the present invention comprises a post-processing apparatus (1
6) presses the layer of paper (13) towards the butting table (28).

Embodiments of the present invention are described in more detail below with reference to the drawings.

In an exemplary embodiment, FIG. 1 shows a printing press equipped with an integrated binder injection device for a layer of paper. The paper arrives from the paper stacking means 10 to a printing means 11 which can include several printing steps and also includes a cutting mechanism 12. The printing material is then tied and bound into a layer 13 of paper, optionally a scale flow or flake flow 1.
It is carried in the form of 4 (flake flow). The printed material then reaches the combination injector 15. Combination injection may include prior puncturing and bathing of droplets with the next injection. The scale flow 14 then passes through post-processing means 16. The tied product is then received from the removal means 17.

As a reference of the invention, FIG. 2 (FIGS. 2a and 2b) shows an apparatus for injecting a binder into a layer of paper. The strip or bar 21 is fitted with, for example, a comb-shaped needle 22 and the needle pressing device 29 causes a pre-perforation 23 (FIG. 2a) of the paper layer 13. Instead of the simultaneous piercing of a plurality of needles 22 with the needle combs 24 located on the bar 21, the puncturing may be performed successively with one or several needles 22. After the perforation, the binder is taken out of the binder storage tank 25 and the binder pressing device
Applies by 26 (Fig. 2b). Until now, the binder has been pressed directly into the perforations 23 or a tubular or hollow needle.
31 is used. During perforation and optionally also during the injection of the binder, the layer of paper 13 is pressed by a pressing device 27 to a butt 28
And the perforation takes place in a controlled manner and does not impede the withdrawal of the needle.

As a reference of the present invention, as can be seen in FIG. 3, as a function of the properties of the paper layer, perforation and binder injection can be performed in the same operation. This is possible if the injection of the binder can be carried out via a hollow or tubular needle 31 at the time of the perforation.

Another possibility of injecting the binder into the paper layer is to expose it to droplets of liquid. As stated, this method is based on the principle of fountain cutting.

As an embodiment of the present invention, FIG. 4 shows an apparatus as used for fountain cutting. The cylindrical frame 41 includes a booster plunger. As a result of its hydraulically controlled movement,
The liquid medium supplied intermittently by the recharging valve 43 is intermittently flushed through the nozzle 44 to the material to be processed at a pressure of a few kbar. The ejected droplet is 600 to 1000m
It has an initial speed of / s.

For example, with the help of the pressing device 27, the paper layer 13 is pre-pressed, so that the kinetic energy of the droplets of the medium is not exhausted due to the mechanical displacement of the paper layer 13,
Instead, they are used to bathe the droplets. As a result of the pressing, the layer of paper is given a wood-like firmness (wood, for example plywood, is well-cuttable by jetting water, as is known).

In this manner, the water can be poured into or through the fold, even with slight adhesive. The paper layer 13 is slightly moistened. The binder is also incorporated into the paper layer when dispersed or colloidal in "water to cut" is added. Since only a small amount of binder is required, the concentration of binder in the jetting water can be kept very low, which prevents any risk of nozzle clogging and corrosion.

The paper layer is locally damaged in both the binder injection embodiment shown in FIGS. 2 and 3 and another embodiment of the binder injection shown in FIG. However, this damage can be made invisible because the booklet cover and possibly also the middle page are added after injection of the binder. The binder exiting through the injection hole during the post-treatment ensures the adhesion between the cover and the middle page. An apparatus corresponding to FIG. 2 shown as a reference example of the present invention is shown in FIG.

The inner page that forms the cover 51, the unit 52 and is not accompanied by the middle page, and the middle page 53 are individually supplied. The binder is injected into unit 52 in the manner shown. Three parts 5
1, 52 and 53 are then combined together and post-processed, for example, by post-processing device 16 and butt 28.

If the binder is used very sparingly, the seam can be made laminable in the post-treatment by short pressing. Drying in post-treatment;
Consolidation of the binder is performed, and another promising option for improving the quality of the seam is to use ultrasound or the like, which has been successfully used to bond plastics.

Product laminability can be improved by slightly wetting the folds before or during folding. In this method, no such treatment is necessary because of the wetness associated with the binder injection.

[Brief description of the drawings]

FIG. 1 is a diagram of an example of a printing machine equipment for producing large quantities of printing material utilizing the injection of a binder into a layer of paper. FIG. 2 is a diagram showing the principle of a two-stage apparatus for achieving a binder injection method including pre-perforation (2a) and binder injection (2b). FIG. 3 is a diagram corresponding to a one-stage apparatus. FIG. 4 is a diagram of an apparatus for placing small drops on a layer of paper. FIG. 5 is a diagram showing the principle of an apparatus for separately treating a cover sheet and a middle sheet in the binder injection method. In the figure, 10 is a paper loading device, 11 is a printing means, 12 is a cutting means, 13 is a paper layer, 14 is a scale flow, 15 is a binder injection device, 16 is a post-processing device, 17 is a removing mechanism, 21 Is a bar,
22 is a needle, 23 is a pre-perforation, 24 is a needle comb, 25 is a binder storage tank, 26 is a binder pressing device, 27 is a paper pressing device, 28 is a butting table, 29 is a needle pressing device, 31 is Hollow needle, 41 is a cylindrical frame, 42 is a booster plunger, 43 is a recharge valve,
44 is the nozzle, 51 is the cover, 52 is the inner page without the middle page,
53 is the middle page.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B42B 5/00 B42C 9/00

Claims (10)

(57) [Claims] 1. A booklet or a temporary booklet, wherein a binder is injected into a paper layer at the same time as opening a hole in a paper layer by spraying a droplet-like binder containing an adhesive. A method for combining layers of paper bound in a book or book format. 2. The method according to claim 1, wherein the binder is injected into all of the paper layers on which the binder is bundled.
The method described in. 3. The method according to claim 1, wherein the binder is injected into a layer of paper without a cover or without a middle page. 4. The method according to claim 1, wherein a post-treatment is carried out after the injection of the binder. 5. A device for joining layers of paper bound in the form of booklets, temporary bindings or books, wherein the droplets of binder containing adhesive are jetted into the layer of paper. A binder injecting device (15) for injecting is arranged in a manner operable on the bundled paper layer, and the binder injecting device (15) includes a booster plunger (4).
2) comprising a cylindrical frame (41) having a recharge valve (43) for storing the binder, and a nozzle (44), and by injecting the binder through the nozzle,
The device characterized in that the binder injection device is arranged such that the binder can be injected into the bundle of papers (13). 6. Apparatus according to claim 5, characterized in that the apparatus further comprises a post-processing device (16). 7. The apparatus according to claim 5, wherein the apparatus further comprises a paper pressing device (27) for pressing the bundled paper layers and a butting table (28). 8. The paper pressing device (27) presses the bundled paper layer toward a butting table, and then ejects the binder through the nozzles to form the paper bundle. Device according to claim 7, characterized in that the binder injection device (15) is arranged such that the binder can be injected into the layer (13). 9. The paper layer is guided such that the binder is injected only into inner pages without the cover (51) or without the middle page (53), and the binder injection is performed. 6. Device according to claim 5, characterized in that a device (15) is arranged and, following the injection of the binder, the cover (51) or the middle page (53) can be bonded to the remaining paper layer. . 10. Apparatus according to claim 5, wherein the post-processing device (16) presses the layer of paper (13) towards the butting table (28).