JPS6245078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for attaching a cover to the spine of a text in a bookbinding process.

Conventionally, the spine gluing process involves applying hot melt adhesive to the spine by running the main text with its spine facing down and bringing it into contact with a gluing roller, and then applying and gluing the cover. .

That is, only one type of hot melt adhesive is used, and it is applied only to the spine of the text.

However, although the spine pasting method described above allows the adhesive to penetrate well into the spine of the main text and improves adhesion, it has disadvantages when adhering to the cover. This is because hot melt adhesive hardens very quickly, and the applied surface hardens considerably within the short time it takes to apply it to the main text and attach it to the cover. This is because it becomes difficult to blend in with the surface of the cover.
Conventionally, in order to avoid the above-mentioned problems, the heating temperature of the hot-melt adhesive supplied to the gluing roller is kept considerably high so that the molten state remains until the cover is attached.

However, this means that the process of cooling and solidifying the adhesive after pasting on the back must be prolonged.

In addition, in the case of conventional application methods, adhesives must be selected by taking into account various characteristics such as permeability to text, flexibility, applicability, and solidification speed, which means that only one type of adhesive is used. Because there is no such thing, some necessary characteristic is sacrificed.

The present invention has been made in view of the above points, and attempts to eliminate the above-mentioned drawbacks by applying hot melt adhesive not only to the spine of the main text but also to the spine of the cover, and then pasting the adhesive. It is something.

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, 10 is the main text, which is made to run in the direction of the arrow a. An applicator roller 16 for applying hot melt adhesive 14 is installed below the running path of the main text so as to be in contact with the spine 12 thereof, and a leveling roller 18 is installed on the traveling side thereof. The leveling roller 18 rotates in the opposite direction to the application roller 16 and acts to rub the hot melt adhesive applied to the back.

The hot melt adhesive is typically stored in a molten state in a container (not shown) equipped with a heating device, and drawn out by the applicator roller 16 to be applied to the spine 12.

On the other hand, a hot melt adhesive 24 is applied to the spine 22 of the cover 20 in a separate process, as shown in FIG.

This hot melt adhesive 24 is guided from a reservoir (not shown) similar to the container described above to a nozzle 26 and applied to the spine of the cover traveling in the direction of arrow b.

Note that the method of applying the hot melt adhesive is not limited to the above-mentioned method, and it may be applied to the text side using a nozzle, or it may be applied to the cover side using a roll.

The main body 10 and cover 20 with hot melt adhesives 14, 24 applied to the spines 12, 22 as described above.
The spines are glued together as shown in the third figure. Then, as shown in the fourth figure, the cover 20 is folded to arrange the appearance of a book. After this, it is sent to a cutting process and made into a finished product.

Here, the main text 10 and the spines 12, 22 of the cover 20 are adhered as shown in the fifth figure. The hot-melt adhesive 14 on the main body side has penetrated well into the spine 12 of the main text, while the hot-melt adhesive 24 on the cover side has also penetrated well into the spine 22 of the cover. Therefore, even if the surface of the applied adhesive layer begins to harden immediately after completing the adhesive application process shown in FIGS. 1 and 2, the back pasting process shown in FIG. Since the surfaces of the adhesive 14 and the adhesive 24 are in contact with each other, they are bonded very well.

The above-mentioned bookbinding formats are generally flat binding and perfect binding.

Flat binding is a relatively inexpensive form of binding, and the binding is not very high-quality.The main text 10 is a stack of double-folded signatures, and the wire-bound back cover 20 is a stack of double-folded signatures. It is affixed as is to the back 12 of.

Therefore, for such flat binding, hot melt adhesives are selected which are inexpensive and do not have very good permeability into paper. 14 to be applied to the main text side and 24 to be applied to the cover side.
It is preferable to use the same type of hot melt adhesive.

Examples of this hot melt adhesive include those having the following composition.

Rosin, petroleum resin 60-65% (wt%) Elvax APP (Atactic polypropylene)
25-30% paraffin wax, polyethylene wax
10-15% On the other hand, perfect binding is a relatively high-grade binding method.
Instead of binding the main text with wire, I cut the spine of the folded paper by 2 to 3 mm, used the cut surface to create a foothold, and applied hot melt adhesive there to allow it to penetrate before attaching the cover. It is something.

In such a bookbinding method, a relatively expensive hot melt adhesive is selected that has good permeability into the paper, especially the main text, and has good strength.

Examples of this hot melt adhesive include those having the following composition.

Hydrogenated rosin 40-45% (wt%) Elvax 40-45% Microcrystalline wax 5-10% (Elvax is the trade name of an ethylene-vinyl acetate copolymer developed by DuPont.) In the present invention, Such hot melt adhesive is applied only to the spine 12 of the text. Moreover, it is applied thinner than before. This is the adhesive 14
This is because there is no need to glue the cover.

Then, the cover 20 is coated with a hot melt adhesive 24 such as that used in the above-mentioned flat binding.

Both of these adhesives have common ingredients,
Although they are different types, they have good adhesion even if they cool and solidify somewhat after the coating process, and therefore, as shown in Figure 3,
As shown in FIG. 5, the main text 10 and the cover 20 are firmly joined.

In addition, in perfect binding, the adhesive 14 to be applied to the main body 10 should have good permeability into the paper, while the adhesive 24 to be applied to the cover 20 should have tensile strength that can withstand bending of the spine. It is also possible to increase the overall strength of the book by changing the blending ratio of each hot melt adhesive.

Note that the spine pasting method described above is not limited to flat binding and perfect binding, but can also be applied to other types of binding such as top binding.

Now, in the present invention, as described above, the hot melt adhesive is applied separately to the spine of the cover and the spine of the main text, so that the main text and the cover are bonded through two layers of adhesive. It turns out. Therefore, the adhesive strength between the main text and the cover can be significantly improved, and the strength of the entire book can be increased.

Furthermore, according to the present invention, the adhesive can be bonded even if the applied hot melt adhesive hardens to some extent, so it is not necessary to heat the hot melt adhesive at a very high temperature as in the past, or to use a heating device after the application process. There is no need to set up any. Therefore, the adhesive hardening process after the backing process can be extremely shortened.

Furthermore, according to the present invention, adhesive is applied to the main text and the cover separately, so for example, an adhesive with good permeability is used on the main text side, and an adhesive that is resistant to bending is used on the cover side. In this way, it is possible to use different materials according to the characteristics required for the main text and the cover, respectively, thereby making it possible to further improve the strength of the entire book.

[Brief explanation of the drawing]

Figures 1 to 4 show an example of the steps of the method according to the present invention. Figure 1 is a perspective view of the process of applying adhesive to the spine of the main text, and Figure 2 is a perspective view of the process of applying adhesive to the spine of the cover. FIG. 3 is a perspective view of the process of attaching the spine of the cover to the spine of the main text, and FIG. 4 is a perspective view of the book with the cover folded after the spine has been attached. FIG. 5 is a partially enlarged view of the joint between the main text and the cover. 10...Main text, 12...Spine of text, 14...Hot melt adhesive, 20...Cover, 22...Spine of cover, 24...Hot melt adhesive.

Claims (1)

[Claims] 1. In a spine pasting method in which the cover is adhered to the spine of the main text, a hot melt adhesive is applied to the entire spine of the cover and the entire spine of the main text in separate steps, and before the hot melt adhesive dries. A spine pasting method characterized by gluing the spine of the cover to the spine of the main text. 2. The spine pasting method according to claim 1, wherein the hot melt adhesives applied to the spine of the cover and the spine of the text are of the same type. 3. The spine pasting method according to claim 1, wherein the hot melt adhesives applied to the spine of the cover and the spine of the main text are of different types. 4. The spine of the cover is coated with a hot melt adhesive mainly composed of rosin and petroleum resin, and the spine of the main text is coated with a hot melt adhesive mainly composed of ethylene-vinyl acetate copolymer. The back pasting method described in Scope 3.