JPS61254397A - Hot melt tape for simple bookbinding machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot-melt tape for use in a simple bookbinding machine with backing.

BACKGROUND OF THE INVENTION As copying machines have recently become widespread, the amount of copied information has become enormous, and it has become necessary to organize and store this information. One method is to bind copy paper in a loose-leaf binder and store it, but for permanent copy information that does not need to be replaced, it is better to bind it and store it in a book that looks better and is more useful. It is also more convenient.

Since binding books by manually applying glue each time is cumbersome, a variety of bookbinding machines have recently become available. Among these, the simple binding machine with spine is
A hot-melt tape with a solid hot-melt adhesive coated on a base paper is used, and this is melted by a heat source such as a heater of a bookbinding machine, and at the same time pressure is applied to bond the book to be bound.

Problems to be Solved by the Invention In a Tsutsuyoshi bookbinding machine that uses such hot melt tape, the hot melt tape is first inserted into the tape insertion groove of the tape guide, and the bound material is placed over this tape for back adhesive. By pressing against the heater, the hot melt tape is melted by heat and adhered to the back surface of the product to be bonded. However, because there is a certain distance between the hot melt tape inserted into the tape guide and the back adhesive heater, the hot melt may not be heated when pressing the bound product onto the back adhesive heater from above the hot melt tape. Or, if the hot melt tape is not completely melted even after being heated, the center part of the hot melt tape will not move toward the heater for back adhesive even if pressure is applied for back adhesive because the rigidity of the back adhesive roller is strong. It may not sink in enough. This tendency is particularly noticeable when the thickness of the bound product is thin, as the stiffness of the product becomes weak.

In this way, especially when the thickness of the bound workpiece is thin, when the bound workpiece overcomes the rigidity of the hot melt 7-pu and pressurizes it for bonding on the back, the tip of the bound workpiece will bend and the bonding process of the bound workpiece will deteriorate. This results in misalignment of the center between the desired surface and the hot melt tape. Alternatively, the hot melt tape may come off from one of the two grooves of the tape guide and become oblique, causing the center of the adhesive surface of the tape and the binding surface to be misaligned. If bookbinding is performed while the center of the tape is misaligned with the center of the adhesive surface of the bound product, binding defects will occur.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to overcome the drawbacks of the hot melt tapes of the prior art described above and to provide a hot melt tape for a simple bookbinding machine that does not cause binding defects even if the bound material is thin.

Means for Solving the Problems In order to solve the problems of the prior art described above, the present invention forms a high tack part for side adhesion by thinly applying hot melt adhesive over the entire surface of the base paper. In a hot melt tape for a simple bookbinding machine, in which a low tack part for back adhesive is formed by further applying hot melt adhesive over the entire length of the central region of the high tack part for use, a low tack part for back adhesive is formed approximately at the center of the low tack part for back adhesive, and the hot melt adhesive is applied over the entire length in the longitudinal direction of the low tack part for back adhesive. To provide a pot-melt tape for a simple bookbinding machine, which is characterized by having continuous or discontinuous grooves.

According to a preferred embodiment of the present invention, EVA (ethylene-vinyl acetate copolymer resin) or PVA is used as the hot-melt adhesive, and the thickness of the adhesive on the high tack portion for side adhesive is approximately 20 to 50 μm, and The thickness of the adhesive applied to the adhesive roller tack portion is approximately 400 to 600 μm.Furthermore, the groove formed in the roller tack portion may be formed, for example, in the shape of a square square, but is not limited thereto.

Insert the hot melt tape into the tape insertion groove of the tape guide. Next, the bound product is pressed from above the hot melt tape against the back adhesive heater. At this time, since a groove is formed in the high tack part of the hot melt tape, even if the thickness of the bound object is thin, the hot melt tape will bend at this groove and the center of the bound object will be aligned with the center of the hot melt tape. This will reduce the discrepancy.

Embodiments The present invention will be explained in detail below based on embodiments shown in the drawings. Referring to FIGS. 1 and 2, these figures show a cross-sectional view and a plan view, respectively, of a hot melt tape of the present invention, which includes EVA on a base paper 30.

Alternatively, the high tack portion 20 for adhesion on the side surface is formed by thinly applying a hot melt adhesive made of PVA. The appropriate adhesive coating thickness for the high tack portion 20 is about 20 to 50 μm. A hot-melt adhesive is further applied over the entire length of the central region of this high-tack part 20 for side-face adhesion to form a low-tack part 22 for back-side adhesion. This back adhesive r
1- The appropriate thickness of the tack portion 22 is approximately 400 to 600 μm, but if this is applied thinly, the hot melt tape becomes weak and bends easily. However, on the other hand, for back adhesive 1]
- If the coating thickness of the tack portion 22 is made too thin, the back adhesive strength will be weakened, so there is a limit.

Therefore, in the present invention, as shown in FIGS. 1 and 2, a V-shaped groove 24 is provided over the entire length of the central part of the back adhesive rotary tack part 22, and the stiffness of the hot melt tape 10 is intentionally weakened in this part. Constructed to be easy to bend. With this structure, the hot melt table 10 can be bent very easily by applying a pressing force even before heating, as shown in FIG.

In the case of the present invention, the thickness of the adhesive applied to the back adhesive rotary contact portion 22 is sufficiently thick, so that the adhesive strength of the back surface using the hot melt adhesive can be maintained sufficiently high.

A case in which simple bookbinding is performed using the hot melt tape of the present invention constructed in this manner will be described with reference to FIG. 3. When binding a book, the hot melt tape 10 of the present invention is inserted into the tape guide 12.12 by the tape inserter 14.
Insert into 14. The tape guide 12 is configured so that its spacing can be adjusted according to the width of the hot melt tape 10. In FIG. 3, the reference numeral 16 indicates a book to be bound, and the reference numeral 18 indicates a heater for adhering the back surface, which includes a nichrome wire heater or the like inside. As shown in FIG. 3, insert the hot melt tape into the tape insertion groove 14 of the tape guide 12.12.
14, the distance between the hot melt tape 10 and the top surface of the back adhesive heater 18 is 5 to 8 m,
When trying to press the bound article 16 from the top surface of the hot melt tape 10 to the back adhesive heater 18, especially the bound article 16
If the thickness of the tape guide 12.12 is thin, when a conventional hot melt tape is used, the binding material 16 may bend due to the rigidity of the hot melt tape 10, or the hot melt tape may bend in both grooves 14. of the tape guide 12.12. It often happens that the tape deviates from one of the grooves of the tape 14 and becomes oblique, causing the center of the tape and the binding material 16 to shift.

However, in the hot melt tape 10 of the present invention, since the V-shaped groove 24 is formed approximately in the center of the back adhesive rotary tack portion 22, the stiffness of the hot melt tape in this portion is intentionally made weak. It is.

Therefore, in FIG. 3, when the bound product 16 is pressed from the top surface of the hot melt tape 10 to the back adhesive heater 18,
The hot melt tape 1o has grooves 24 provided in the longitudinal direction.
It breaks at the part , and is easily deformed as shown in Figure 4.

Therefore, even if the thickness of the bound book 16 is thin, the center of the bound book and the center of the hot melt tape 10 are likely to coincide, and binding defects will not occur.

Generally, the temperature of the back adhesive heater 18 is 180 to 200.
℃, and when the bound object 16 is pressed against this heater through the hot melt tape 10, the temperature of the Botmelt adhesive rises to about 100 degrees Celsius, the melting of the hot melt is completed in 2 to 4 seconds, and the bound object is completely melted. The back can be glued. Thereafter, the high tack part for adhering the side surfaces is melted to adhere the side surfaces of the bound product, but since this is not within the scope of the present invention, the explanation thereof will be omitted.

In the above-mentioned embodiment, an example was shown in which a linear continuous V-shaped groove was formed in the back adhesive rotortack part, but this groove is not limited to a 7-shaped groove, and of course may have other shapes. Discontinuous grooves, rather than roughly continuous grooves, can also be employed for the purposes of the present invention.

Effects of the Invention Since the present invention is constructed as described in detail above, even in the case of a book-bound book, the center of the book-bound book and the center of the hot-melt tape can easily match because the hot-melt tape is easy to bend at the grooves. This has the effect that binding defects are less likely to occur.

Furthermore, since the thickness of the hot melt adhesive in the back adhesive roller tack portion can be made sufficiently thick, the adhesive strength of the back surface can be maintained at a high level of 1 minute.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the hot melt tape for a simple bookbinding machine of the present invention, Fig. 2 is a plan view thereof, and Fig. 3 is a schematic configuration diagram showing the hot melt tape in the 1c state when inserted into the tape guide of the simple bookbinding machine. , FIG. 4 is a sectional view of the hot melt tape in a bent state. 10: Hot melt tape 12: Tape guide 16: Binding product 18: Heater for back adhesive 20: High tack section for side adhesive 22: Low tack section for back adhesive 24: Groove 30 Two base paper Fig. 1 5υ Fig. 2 Fig. 3 Figure 4: Labor

Claims (1)

[Claims] A hot melt adhesive is thinly applied to the entire surface of the base paper to form a high tack part for side adhesion, and a hot melt adhesive is further applied over the entire length of the central area of the high tack part for side adhesion to form a low tack part for back adhesion. A hot melt tape for a simple bookbinding machine, characterized in that a continuous or discontinuous groove extending over the entire length in the longitudinal direction is provided approximately in the center of the low tack part for back adhesive.