FR2836862A1 - Process to bind magazine, book or pamphlet by transverse notches in spine plugged with bonding agent - Google Patents

Abstract

Following the printing process for e.g. a magazine, each sheet of paper making up the section is folded along the page edges, and the various sections are placed in order with their spines aligned. Notches are cut in the spines esp. using a die-cutter, drill, laser beam, water jet or sand jet. The notches are transverse to the spine edge, are wider in the gutter than in the spine, and subsequently plugged with a bonding agent.

Description

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L'invention concerne un procédé pour relier des feuilles par collage sous forme d'un ouvrage, un dispositif de mise en oeuvre du procédé et un ouvrage relié par ce procédé. DESCRIPTION

The invention relates to a method for joining sheets by gluing in the form of a work, a device for implementing the process and a work connected by this process.

Many catalogs and brochures are presented with binding. For this, several shaping steps are necessary. You must first print the different sheets, each including the desired number of pages, generally 8, 16, 32 or 64 depending on the format of the book. On each sheet are printed the desired number of pages separated from each other by margins which will be cut during a subsequent shaping step.

These pages are folded by automatic folding machines to form kinds of notebooks which are then transmitted to an assembler who superimposes them to constitute a complete volume. The complete volume is then presented to a device which prepares the back of the volume by cutting the excess paper formed by the margins between the pages by milling, sawing or grating. The three visible sides of the volume are cut for example by a trilateral cutter. The glue is applied to the back of the work, the cover is applied to the volume and a significant pressure is exerted on it while the glue dries and ensures the setting. The edges of the cover are then folded and folded down.

This type of binding is relatively economical but does not provide great resistance. The sheets are only retained by the glue by their edge which represents only a very small surface. They therefore come off very easily.

To improve the adhesion of the sheets to the glue, it is common to practice in the back of the volume transverse grooves into which the glue penetrates. These grooves generally have a depth and a width of the order of 1 mm with a spacing of approximately 10 mm. The gluing area is then increased, but these sheets can still be easily removed.

To increase the quality of the binding, especially for commonly consulted works such as mail-order catalogs or city maps, it is necessary to use adhesives with high adhesive power which, because of their price, is an important factor. the cost price of such a binding.

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 This type of binding is very commonly used for the production of free advertising catalogs. It is therefore imperative that their manufacturing cost be as small as possible. The objective of the invention is therefore to develop a binding method of the type of that indicated above which makes it possible to significantly reduce the cost price of binding.

 This objective is achieved by the method according to the invention in which the sheets to be bound are * first folded in the form of notebooks, 'the different notebooks are then superimposed to form the work,' then notches are formed transversely in the back of the work to a depth sufficient to reach the folds located inside each notebook and * the glue is applied to the back of the work so as to penetrate into the notches.

 Thanks to this process, it is no longer necessary to prepare the back before making the cuts and applying the glue. The pages of the works thus produced are linked two by two in the form of sheets forming at least one notebook, these sheets having notches on the back side of the work. Each sheet of each notebook, including the central sheet, is in contact with the glue thanks to the notch which is sufficiently deep. The pages of the book can no longer be torn off because they are on the one hand fixed with glue and on the other hand linked to another page of the notebook, so that they are still retained by the sheets located more in the center of the notebook.

 Thanks to this process, the space between the notches can be increased compared to the space usually used for conventional glue bindings.

 This avoids a shaping step while increasing the resistance of the binding. It is also possible to use less efficient glues and therefore less expensive while ensuring a very efficient binding. The cost of the binding process, and consequently the cost price of the works produced, are therefore considerably reduced.

 To further increase the resistance of the binding, it is possible that the section of at least one of the notches widens in the direction of the vertical edge of the book to

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 anchor the glue in the sheets. This notch may for example have the shape of a T or an arc beyond.

 The cuts can be made for example by drilling, punching, milling or cutting with a laser beam, a jet of water or sand.

 The invention also relates to a device for implementing the method comprising means for making notches on the back of the notebooks forming the work. These means may consist of a drill, a punching machine, a milling machine or a laser beam cutter, by water jet or by sand jet.

 To ensure good penetration of the glue into the notches, means may be provided on the device for applying the glue to the notches.

The invention will be presented in more detail below using the following figures
Figure 1: a recto-poured printed sheet containing 8 pages;
Figure 2: notebooks formed by folding sheets and assembled to form a work in which notches are formed;
Figure 3: different forms of notches.

 The pages of the book are printed on sheets (1) respecting the imposition.

In the example presented, each sheet has 8 pages. But it is obvious that this process can be applied to sheets comprising many more pages, the minimum being 4 pages, that is to say a double-sided sheet.

 The sheets are folded according to a folding plan determined by the number of pages per sheet. In the example presented, the sheets are folded twice along the fold lines indicated in Figure 1 in dotted lines. Notebooks (2) are then obtained which are assembled to form the work (3) before bonding.

 The assembly of notebooks is generally maintained in a press and transverse notches (4) are made on the back of the notebooks (2) assembled.

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 The glue is then applied in a conventional manner to the back of the assembly of notebooks, for example using metal rollers. Additional means can be provided to ensure better application of the adhesive in the notches, for example using nozzles.

 The cover is then applied to the glue and the flaps are folded back to form the finished product.

 The preparation of the three visible slices is carried out in a conventional manner after gluing by cutting, for example with a cutter.

 The notches must at least reach the central sheet of each notebook. They can be fine like conventional notches or be wider to increase the contact surface between the paper and the glue. They can have different shapes: longitudinal cuts (4a), triangular cuts (4b) or mushroom-shaped cuts (4c) or T (4d). These last two forms allow the paper to be anchored in the glue, further strengthening the resistance of the binding, in particular for the central sheets.

 The shape and size of the notches as well as the spacing (a) between the notches will be determined according to the desired strength and the quality of the adhesive used.

 We will use a high temperature glue.

List of references:
1 Sheet
2 Notebook
3 Work before bonding
4 Notches

Claims (8)

 Claims 1. Method for binding sheets by gluing in the form of a work, characterized in that the sheets (1) to be bound are 'first folded in the form of notebooks (2),' your different notebooks (2) are then superimposed to form the work (3), then notches (4) are formed transversely in the back of the notebooks forming the work over a sufficient depth to reach the folds located inside each book (2) and ') the glue is applied to the back of the work so as to penetrate into the notches (4).  2. Method according to the preceding claim, characterized in that the section of at least one of the notches (4c, 4d) widens in the direction of the vertical edge of the work to ensure anchoring of the glue in the sheets .  3. Method according to one of the preceding claims, characterized in that the notches (4) are produced by drilling, by punching, by milling or by cutting using a laser beam, a water jet or sand.  4. Device for implementing the method according to one of the preceding claims, characterized in that it comprises means for making notches (4) on the back of the notebooks (2) forming the work.  5 Implementation device according to the preceding claim, characterized in that the means for making the notches consist of a drill, a punching machine, a milling machine or a cutter by laser beam, by jet of water for sand blasting.  6. Implementation device according to one of claims 4 or 5, characterized in that means are provided for applying the adhesive in the notches. <Desc / Clms Page number 6>  7. Book connected by the method according to claim 1, characterized in that the pages of the book are linked in pairs in the form of sheets forming at least one notebook (2) and in that these sheets have on the back side of the work of the notches (4).  8. Structure according to the preceding claim, characterized in that the section of at least one of the notches (4c, 4d) widens in the direction of the vertical edge of the structure.