JPH07156575A - Spine for bookbinder - Google Patents

Abstract

PURPOSE:To prevent a spine from being broken due to blocking by a method wherein two hot-melt bonding layers the melting points of which are different from each other, are pasted in advance onto mounting paper serving as spine under the condition that the melting point of the upper bonding layer is set to be higher than that of the lower bonding layer. CONSTITUTION:Onto low-melting hot-melt adhesive layer 2, hot-melt adhesive layer 1, the melting point of which is higher than that of the hot-melt adhesive layer 2 is laminated. Adhesives having the above-mentioned laminated constitution is pasted in advance onto mounting paper serving as spine 3. In this case, the total thickness of the adhesive layers 1 and 2 is set to be 0.1-1.5mm. Further, the thickness of the upper adhesive layer 1 is set to be 0.01-1.0mm. Furthermore, the preferable melting point of the upper hot-melt adhesive layer 1 is set to be about 60-80 deg.C, while that of the lower hot-melt adhesive layer 3 is set to be about 50-70 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a book binding spine which is fused by heating with a hot melt adhesive generally called a binding binder for book binding and adheres an original. The present invention relates to a back cover for binding that can be bound in.

[0002]

2. Description of the Related Art Conventionally, what is called a gluing binder for bookbinding has a hot-melt adhesive applied to a backing sheet as a back cover in advance, or a hot-melt adhesive sheet (thickness: 0.05 to 1.5 kg / m ² ) is attached,
The original is sandwiched between the spine and then the hot melt adhesive is melted by a heater to bond the original. The adhesive used in such means is mainly made of EVA, and is made by adding a tackifier such as rosin or petroleum resin, a viscosity adjusting agent such as wax, an antioxidant, an antioxidant, etc. It takes 1 to 2 minutes per book to melt and bond the hot melt adhesive, and it also requires time to cool and wait for the adhesive to fix even after melting and bonding the original. However, there is a drawback that it takes about 5 to 10 minutes before it can be handled.

Further, the high melting temperature of the hot-melt adhesive has a drawback that adhesion failure is likely to occur.

The hot-melt adhesive for bookbinding is such that after the manuscript is sandwiched on the spine, it is melted on the heater of the bookbinding machine and penetrates and adheres to the manuscript. At this time, the melting of the hot-melt adhesive is just to the end. Due to heat conduction, heat travels down the spine and later reaches the hot melt adhesive. It takes about 15 to 30 seconds for the hot melt adhesive surface to reach a peak by heating. This greatly differs depending on the thickness of the hot melt adhesive, and if the thickness of the hot melt adhesive is thin, the time to reach the peak temperature is shortened and the melting time is shortened accordingly. However, the job of binding is
It is necessary for the melted hot melt adhesive to penetrate to the original side to some extent in order to obtain stable adhesion. Usually, the hot melt adhesive has a thickness of 0.9 m / m or more, Therefore, the time to reach the peak temperature was inevitably long.

Further, as an adhesive for short-time bookbinding, Japanese Patent Laid-Open No.
Known is -253396, which has a multi-layered structure in which the softening point of the hot melt adhesive is lowered as the hot melt adhesive is separated from the spine cover.

However, the softening point of the above product is 1 in the lower layer.
The temperature is set in the range of 00 to 200 ° C. and 50 to 90 ° C. in the upper layer. However, when a hot melt adhesive is made with such a constitution and used for bookbinding, it takes 25 to 30 seconds for the adhesion time, and the conventional 30 seconds to 1 second. No significant time savings can be obtained.
Furthermore, the hot melt adhesive with this configuration is applied to the spine cover and then folded and stored until the spine cover is used, but the hot melt adhesive will not adhere to the spine cover with time and peel off. , If you try to peel it off forcibly, it will damage the spine, resulting in a loss of the spine's value.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned conventional drawbacks by shortening the bonding time,
Moreover, it is intended to provide a back cover for bookbinding, which does not damage the back cover due to blocking when the back cover is folded and stored.

[0008]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and its gist is that two kinds of hot-melt adhesive layers having different melting points are preliminarily bonded to each other on a backing sheet as a back cover. The upper cover layer is composed of a layer having a higher melting point than the lower adhesive layer, which is a spine for bookbinding.

The present invention will be described in more detail below.

FIG. 1 is a block diagram of the bookbinding adhesive of the present invention, and FIG. 2 is a perspective view of the spine cover of the present invention.

As shown in FIG. 2, the bookbinding spine cover of the present invention has a hot-melt adhesive layer 1 having a melting point higher than that of the hot-melt adhesive layer 2 on the hot-melt adhesive layer 2 having a low melting point. The two-layered adhesive layered as shown in FIG. 1 is previously bonded on a backing sheet.

The melting point of the upper hot melt adhesive layer 1 is preferably in the range of 60 to 80 ° C., and the melting point of the lower hot melt adhesive layer 2 is preferably in the range of 50 to 70 ° C.

The upper hot-melt adhesive layer has a melting point of 6
When the temperature is lower than 0 ° C, the adhesive is heated and melted in a short time and penetrates into the original side, which is preferable, but the adhesiveness to the spine during storage increases, which is not preferable, and when the upper hot-melt adhesive layer 1 exceeds 80 ° C. Although it does not adhere to the spine cover during storage, it is preferable, but heating and melting of the adhesive takes time, and bookbinding time becomes long, which is not preferable.

If the melting point of the lower hot-melt adhesive layer 2 is less than 50 ° C., the temperature difference of the melting point of the upper-layer hot-melt adhesive layer 1 is too large, and the heat conduction to the upper layer is insufficient. If the temperature exceeds 70 ° C., it takes time to heat and melt the adhesive, and not only the bookbinding time becomes long, but also the penetration of the adhesive on the original side is insufficient, which is not preferable, and the above range is preferable.

In order to obtain the hot melt adhesive layer 1 as the upper layer and the hot melt adhesive layer 2 as the lower layer, ethylene-vinyl acetate copolymers having different vinyl acetate contents as the base polymer are mainly known rosins, petroleum resins, A tackifier and the like are mixed to prepare an upper layer hot melt adhesive layer 1 having a melting point of 60 to 80 ° C. and a lower layer hot melt adhesive layer 2 having a melting point of 50 to 70 ° C.

The total thickness of the hot melt adhesive of the present invention is 0.1 to 1.5 m / m, preferably 0.2 to 0.7 m / m.
And the thickness of the upper hot melt adhesive layer 2 is 0.01
~ 1.0 m / m Desirably 0.01 to 0.5 m / m is preferred. Overall thickness of hot melt adhesive is 1.5m / m
When the thickness exceeds 0.1, it takes too much time for the adhesive to melt, and when the thickness is less than 0.1 m / m, the amount of the adhesive penetrating to the original side is too small and the adhesive effect cannot be sufficiently exhibited, which is not preferable. .

[0017]

The present invention will be described in more detail based on the following examples. Example 1 (Preparation of lower layer hot melt adhesive) EV210 (manufactured by Mitsui Polychemical Co., Ltd.) 45 parts by weight B-170 (manufactured by Nippon Zeon Co., Ltd.) 45 NS-5 (Ouchi Shinko Chemical Co., Ltd.) ) Co., Ltd.) 0.5 Weigh the above ingredients into a 200 cc SUS beaker and
Pour into an oven at 30 ° C for 30 minutes, then stir well with a SUS spatula, sufficiently melt the whole, defoam simultaneously with melting in the oven again, melting temperature 60 ° C softening point 40 ° C A hot melt adhesive of

(Preparation of Hot Melt Adhesive for Upper Layer) Ethylene-vinyl acetate copolymer resin EV210 (manufactured by Mitsui Polychemical Co., Ltd.) 45 parts by weight Petroleum resin B-180 (manufactured by Nippon Zeon Co., Ltd.) 25 microcrystalline Wax HIMIC2065 (manufactured by Nippon Seiro Co., Ltd.) 10 Antioxidant NS-5 (manufactured by Ouchi Shinko Chemical Co., Ltd.) 0.5 The above components are weighed in a 200 cc SUS beaker and 1
Pour into an oven at 30 ° C for 30 minutes, then stir well with a SUS spatula to sufficiently melt the whole and again perform defoaming at the same time as melting 5 in the oven. An adhesive was obtained.

In the present invention, the hot melt adhesive having a two-layer structure for bookbinding is prepared by placing a Teflon sheet on a hot plate and keeping it at 100 to 110 ° C. Next, the lower layer hot-melt adhesive that was previously melted in a heating furnace was flowed down onto the Teflon sheet, and the 0.8m / m spacers placed on both ends of the Teflon sheet were pulled down by a doctor knife to remove the Teflon sheet. Apply hot melt adhesive on top. After that, the Teflon sheet coated with the hot melt adhesive is removed from the hot plate, and allowed to cool on the table to solidify to obtain a hot melt adhesive having a thickness of 0.6 m / m.

Since the above-mentioned hot melt adhesive for the upper layer is thin, it is difficult to apply it in the same manner as the hot melt adhesive for the lower layer.
The hot melt adhesive that is the upper layer is placed on the Teflon sheet placed on the hot plate, and then spread on the Teflon sheet with a SUS spatula. After that, the Teflon sheet coated with the hot melt adhesive is removed from the hot plate, and allowed to cool on the table to be solidified to obtain a hot melt adhesive having a thickness of 0.1 m / m and 0.3 m / m.

The two types of hot-melt adhesive sheets produced by the above method are laminated so that the surfaces of the hot-melt adhesives are superposed on each other, and then the hot-melt adhesive as the lower layer is placed on the lower surface of the hot plate. Then, the Teflon sheet was lightly touched to secure the bonding of the two kinds of adhesives. The hot-melt adhesive thus laminated was sandwiched between Teflon sheets, removed from the hot plate and allowed to cool and solidify. After that, peel off the hot melt adhesive from the Teflon sheet to a thickness of 0.7.
A two-layer hot melt adhesive having m / m and 0.9 m / m was obtained.

The hot melt adhesive obtained as described above was cut into a width of 10 m / m with a cutter knife, and the hot melt adhesive as the lower layer was attached so as to contact the spine cover,
The back cover for bookbinding of the present invention was used. Comparative Example 1 Ethylene-vinegar copolymer resin EV220 (manufactured by Mitsui Polychemical Co., Ltd.) 45 parts by weight Petroleum resin P-500 (manufactured by Nippon Zeon Co., Ltd.) 45〃 Microcrystalline Wax HiMic3090 (Nippon Seiwa Co., Ltd.) 10 〃 Antioxidant NS-5 (manufactured by Ouchi Shinko Chemical Industry Co., Ltd.) 0.5 〃 Weigh the above ingredients into a 200 cc beaker made of SUS and
The mixture was placed in an oven at 30 ° C. for 30 minutes, then sufficiently stirred with a SUS spatula, sufficiently melted, and again defoamed simultaneously with melting in the oven to obtain a melt temperature 93 ° C. hot melt adhesive. The hot melt adhesive is treated with a Teflon sheet placed on a hot plate in the same manner as the lower and upper hot melt adhesives to make a 0.9 m / m thick hot melt adhesive, and a width of 10 m / m with a cutter knife.
The sheet was cut into / and attached to the spine cover in the same manner as in Example 1 to obtain a book binding spine cover. <Test conditions> Binding time Binding time was measured using a binding machine Q bind (manufactured by Canon Uptex Co., Ltd.).

Environmental temperature A constant temperature and humidity chamber was used.

Adhesive Strength After being left at each environmental temperature for 20 hours, one of the bound originals was measured with a tension gauge.

Blocking It was sandwiched between a hot-melt adhesive and a spine cover and left in a thermo-hygrostat for 20 hours while applying a load of 8 g / cm ² , and the state was examined.

Bookbinding state The bookbinding state was confirmed visually and by turning the pages.

[0027]

[Table 1] 8 g of the product of the present invention having a thickness of 0.7 m / m in Example 1 of the present invention
Even when stored at a temperature of 40 ° C and 50 ° C under a load of / cm ² for 20 hours, blocking between the hot melt adhesive and spine is not observed, and the bookbinding state is also good. It was shortened to 1/2 to 1/4 of Example 1 and workability was improved significantly. Also, the 0.9 m / m thick product of the present invention was not blocked even when stored under a load of 8 g / cm ^{2 in} a room temperature environment for 20 hours, and the bookbinding time was shortened to half that of Comparative Example 1. The bookbinding condition was also good.

[0028]

As described above, according to the book binding back cover of the present invention, when the back cover is folded and stored, the back cover is not damaged by blocking, and the bookbinding state is extremely good and the bonding time is also long. It can be shortened and workability can be greatly improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a bookbinding adhesive of the present invention.

FIG. 2 is a perspective view of a book binding spine cover of the present invention.

[Explanation of symbols]

 1 High melting point hot melt adhesive layer 2 Low melting point hot melt adhesive layer 3 Back cover

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kimiaki Hayakawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hideaki Furukawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Incorporated (72) Inventor Hideo Yamamoto 5540-11 Sakate-cho, Mizukaido-shi, Ibaraki Canon Aptex Co., Ltd.

Claims (3)

[Claims] 1. A hot-melt adhesive layer having two different melting points is previously laminated on a backing sheet.
A spine for bookbinding, characterized in that the upper layer is composed of a layer having a higher melting point than the adhesive in the lower layer. 2. The total thickness of the adhesive layer is 0.1 to 1.5.
The spine cover for bookbinding according to claim 1, which is m / m. 3. The thickness of the upper layer according to claim 1 is 0.01 to
The spine cover for bookbinding according to claim 1, which has a thickness of 1.0 m / m.