JPH0578573U - Cover with paper sheets - Google Patents

Abstract

(57) [Abstract] [Purpose] To make it possible to heat-bond all of the paper paper to the heat-melting adhesive layer without unevenness. [Structure] The heat-melting adhesive layer 4 is provided not only inside the spine 2 but also inside both the front cover 1 and the back cover 3, and at a position higher than the surface of the heat-melting adhesive layer 4 on the spine 2. It is formed continuously from the back 2. [Effect] A small number of text sheets on the side in contact with the front cover and the back cover are stably heat-sealed with the heat-meltable adhesive layer.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention consists of a spine, a front cover and a back cover connected to the back, and a heat-melting adhesive layer inside these (hereinafter, the heat-melting adhesive layer is simply referred to as a heat-melting adhesive layer. The paper is bound by a heat-adhesive agent) and the main body of the paper is bound by heat-adhesion.

[0002]

[Prior Art]

 A paper-sheet binding cover, which is composed of a spine, a front cover and a back cover connected to the back, and a body of paper is bound by thermal bonding by means of a thermal adhesive layer on the inside thereof, is, of course, known. For the heat-bonding layer on these paper-sheet binding covers, a strip of heat-bonding agent is prepared in advance, and it is sized according to the width of the back and then attached to the inside of the back, or by means such as heat-bonding. The thermal adhesive layer is formed by applying the thermal adhesive layer, or the thermal adhesive layer is formed by applying the thermal adhesive layer.

[0003]

[Problems to be solved by the device]

 In forming such a heat-adhesive layer, the former strip of heat-adhesive is prepared in advance, and the heat-adhesive layer is formed by pasting this on the inside of the back or by heat-adhesion. It is generally considered to be preferable. That is, the heat-adhesive layer is provided on the entire surface of the back and the thickness can be maintained at almost the same level. Is preferable, but this paper-stitched cover sheet has drawbacks from the viewpoint of manufacturing.

For example, in the case of a cover with a wide back, it is easy to heat-bond the strip of the heat-adhesive layer cut to a certain width to the inside of the back to make a heat-adhesion. As the width becomes narrower, it is not easy to attach the strips of the heat-adhesive layer or to heat-bond them, and it is difficult to commercialize them. In particular, bind a few sheets of text such as a few sheets or a dozen sheets. In the case of a cover, it is inevitable that it will become a high-cost product if it is commercialized.

On the other hand, it is technically easy to apply the thermal adhesive to the back to form the thermal adhesive layer, and there is an advantage that it can be performed at low cost, but this also has a drawback. This will be explained with reference to FIGS. 2 to 4. Usually, the thermal adhesive is applied with the front cover open, the front cover 1, the back 2 and the back cover 3 laid flat. Is applied in a state where it is heated and reduced in viscosity, so that both ends of the thermal adhesive layer 4 may protrude from the area of the back part 2, flow out, and solidify as shown in FIG. When the thermal adhesive layer 4 is solidified in such a state, it hinders the folding of the front cover sheet 1 and the back cover sheet 3. Also, when the thermal adhesive layer 4 is properly solidified within the range of the back 2 as shown in FIG. 3, when the front cover 1 and the back cover 3 are bent, the result is as shown in FIG. Even in this case, the surface of the heat-adhesive layer 4 is not horizontal, but a circular arc is drawn, and deep recesses 6 are formed at both ends, that is, at positions where the front cover 1 and the back cover 3 are in contact with each other. The presence of the recess 6 is not a decisive difficulty when the body paper 5 is composed of a large number of sheets, but when the body paper 5 is composed of a small number of sheets, one part of the body paper 6 is not heat-bonded, that is, bookbinding. The phenomenon that it was not done was recognized. Further, in the structure shown in FIG. 5 disclosed in Japanese Patent Publication No. 61-4675, since the pair of cover sheet adhesive strips as spacers has a thickness of 0.76 mm on one side only, Bookbinding with a thickness of 1.52 mm or less is impossible. Generally, when aligning a booklet, the text is sandwiched between the front and back covers, so the adhesive strips on the back of the front cover as spacers and the back of the back cover It is preferable that the gap between the adhesive and the strip be appropriately set. The one disclosed in Japanese Patent Publication No. 61-4675 cannot make a butt alignment, and conversely, the gap is too large. As a result, the phenomenon that a part of the text paper is not heat-bonded is recognized.

Such a phenomenon is caused by the fact that the text paper at the position of the concave portion 6 of the text paper 5 placed on the thermal adhesive layer 4 is skewed on the thermal adhesive layer 4 and is skewed. As a result, one end of one sheet of text paper in the recess 6 is at a high position of the recess, but as it goes to the other end, it is in a deep position of the recess, that is, a position in contact with the front (back) cover. Therefore, it was found that they were not heat-bonded.

This invention aims at forming a thermal adhesive layer capable of thermally adhering all the text sheets even if the number of the text sheets to be bound is not limited to a large number. Was made as.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention comprises a spine, a front cover and a back cover which are connected to the back, and a thermal adhesive layer on the inside of the spine binds the main text by heat bonding. The adhesive layer is not only on the inside of the spine, but also inside the front and back covers, and at the position higher than the surface of the thermal adhesive layer on the spine, it is formed from the spine that is continuous from the spine. By doing so, the purpose was often achieved.

In the case of the cover of the present invention, even if the width of the back part is as narrow as about 1 mm, the small number of text sheets to be bound here can be completely heat-bonded for binding. It should be noted that even if the width is less than this, it suffices as long as the heat receiving area from the hot melter capable of melting the thermal adhesive is sufficient.

In this invention, the thickness of the heat-adhesive layer on the back is preferably about 300 μ to 1 mm, and the height of the heat-adhesive layer on the front and back covers is melted by heating when heat-sealed during bookbinding. It should be within the range that can be.

The thermal adhesive used in the present invention is not limited to a specific one as long as it is a commonly used thermal adhesive. Further, it is preferable to use a coating means to form the thermal adhesive layer.

[0012]

[Action]

 A heat-adhesive layer is formed on the spine and the front and back covers on both sides, and since the front and back cover layers are formed to reach a position higher than the surface of the back layer, the heat-adhesive layer is formed. Since the surface of the agent layer has a U-shape, the text paper placed on the back does not have the recesses seen in the kamaboko-shaped layer due to simple application means. It came into contact with the storage layer and was heat-bonded.

[0013]

【Example】

 Next, an example of implementation of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 is a front cover, 2 is a back part, 3 is a back cover, and the front cover 1 and the back cover 3 are connected to the back part. Reference numeral 4 is a thermal adhesive layer, and 5 is a text paper.

[0015]

[Effect of the device]

 When the cover sheet with the heat-bonding layer described in detail above is used, not only when a large number of paper sheets are used, but also when the booklet is made using a few paper sheets, the whole text is printed. The paper was heat-bonded in a completely orderly manner, and the phenomenon in which the paper piece that contacts the hail (back) cover or a paper piece that is close to it does not heat-bond as in the past was not seen. Further, it is most preferable to form such a heat-adhesive layer by a coating means, which allows the layer to be formed at low cost and facilitates bookbinding of a small number of text papers, which has been difficult in the past. It was done reliably and at low cost.

[Brief description of drawings]

FIG. 1 is a side view of a cover showing an example of implementation of the present invention.

FIG. 2 and FIG. 3 are side views showing a state in which a cover sheet is developed, which schematically shows formation of a thermal adhesive layer on a conventional cover sheet.

FIG. 4 is a side view showing a state in which the thing of FIG. 3 is bent.

[Explanation of symbols]

 1 Front Cover 2 Back 3 Back Cover 4 Thermal Adhesive Layer 5 Body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiichi Ichikawa 3-8-5 Misaki-cho, Chiyoda-ku, Tokyo Inside Kanda Sales Office of Dynic Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A hot-melt adhesive in a paper-sheet binding cover, which comprises a spine, a front cover and a back cover connected to the back, and a body of paper is bound by heat bonding by a heat-melt adhesive layer on the inside thereof. The layer is characterized by being formed not only on the inside of the back but also on the inside of the front cover and the back cover and further from the back to a position higher than the surface of the heat-melting adhesive layer of the back. Cover with paper sheets.