JPH0419039B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a plurality of sheets comprising a cover front cover, a cover back cover, and a back part joining the two covers at their side edges, and the inner surface of the back part is provided with a thermoplastic synthetic resin adhesive layer. The present invention relates to a protective cover whose back width is adjusted in advance for storing independent sheets and/or temporarily bound documents in the form of a bound file.

French Patent No. 2,189,215 discloses a protective cover which has been subjected to certain pre-treatments to enable even an amateur to file documents. This protective cover consists of two rigid or flexible covers made of durable paper or synthetic resin and a spine that joins the covers, and a thermoplastic synthetic resin adhesive coating layer is provided on the inner surface of the spine. There is. The coating layer does not exhibit adhesive properties at room temperature, but can be activated by heating.
Document binding involves stacking individual sheets and arranging them on a flat baseboard, then placing them in a protective cover and activating the adhesive layer using a heat source that is readily available in the office or home. This can be carried out relatively easily by letting the process take place. However, this protective cover requires waving of the stacked sheets during binding to the protective cover in order to make sufficient contact with the activated adhesive layer to form a secure bond and bundle. It is also stated that a rigid material can be used for the back in order to obtain a durable protective cover.

However, the back made of a rigid material then has the disadvantage that it cannot be varied in width and can therefore only be used for document files of a certain thickness or height.

U.S. Pat. No. 3,954,548 discloses an adhesive strip having a relatively thick film of thermoplastic adhesive on a reel. This adhesive strip is heated in a special device and adhered to one side edge of the superimposed sheets to be filed. When the width of the adhesive elongated body is wider than the width of the side edge to be bonded, binding can be carried out in such a manner that the protruding adhesive elongated body wraps around the outer cover.
When this is cooled to room temperature, the stacked sheets are bound together on a rigid back.

Documents filed in this manner give the impression that they are well-organized and carefully stored, and the files themselves do not easily fall off unless handled roughly.

However, this binding operation must be performed by a specialist and requires an expensive device that can only perform sequential processing. Moreover, files produced by this method can no longer be disassembled and individual sheets can be picked out or newly inserted as needed.

Further, Belgian Patent No. 869886 discloses a universal protective cover in which a thermoplastic synthetic resin adhesive layer is provided on the inner surface of the back. In this protective cover, the spine that joins the front and back covers is made of an elongated body of flexible plastic foil.

However, the use of the flexible back disclosed in the Belgian patent has the following drawbacks. In other words, files made using this type of flexible back protective cover often have insufficient strength, especially when the thickness of the stacked sheets exceeds a certain thickness. Become.
Moreover, this type of flexible back can lead to creases when opening and closing bound documents that can eventually damage the files.

The object of the present invention is to overcome the above-mentioned disadvantages and provide a durable and variable spine width for binding individual sheets and/or temporarily bound documents in the form of a file or a bound booklet. Moreover, it is an object of the present invention to provide a protective cover that allows sheet-like objects to be put in and taken out.

The document protection cover of the present invention consists of a cover front cover, a cover back cover, and a back part that joins the two covers at their side edges, and the inner surface of the back part is provided with a thermoplastic synthetic resin adhesive layer, and the back cover is provided with a thermoplastic synthetic resin adhesive layer. A document protection cover for binding documents that have been bonded together using the adhesive layer, wherein: (1) the back portion is made of a thermoplastic synthetic resin that is substantially solid at room temperature and has sufficient adhesive properties at room temperature; (2) The back portion is softened together with the thermoplastic synthetic resin adhesive layer by heating to form folded portions parallel to each other at intervals equal to the thickness of the documents to be bound. It holds the documents to be bound, maintains the bent part that fits the bound documents after cooling to room temperature, and (3) the back part is softened again together with the thermoplastic synthetic resin adhesive layer by reheating. , which is characterized by making it possible to add and subtract documents. In the protective cover of the present invention, folds (bent portions) fixed to both sides of the back of the file are formed in a state in which the file is manufactured.

In one preferred embodiment of the invention, the back of the protective cover is made of an elongated body made of a thermoplastic synthetic resin which is substantially solid at room temperature and has sufficient rigidity at room temperature, for example made of rigid polyvinyl chloride. Become. In addition, the above-mentioned sufficient rigidity means:
This refers to the rigidity required to maintain the bent portion that has been formed.

The front and back covers are also preferably made of polyvinyl chloride, but may be rigid or flexible, transparent or opaque.

Advantageously, the cover made of synthetic resin is joined to the back by heat bonding or heat sealing.

The thermoplastic synthetic resin adhesive layer is preferably formed on the inner surface of the back using a heated fish tail nozzle. The synthetic resin adhesive used exhibits substantially no adhesive properties at room temperature.

The temperature of the thermoplastic synthetic resin used for the back is 80 to 120℃.
It is preferable to use a material that softens and becomes fluid when heated to a temperature of 100 ml, and in this state, a portion of the back portion wraps around the side surface near the back side of sheets and/or documents that are stacked to be bound.

The thermoplastic synthetic resin adhesive used in the present invention becomes adhesive at a temperature below the softening temperature of the back, and does not exhibit poor adhesiveness even when heated at least once, preferably multiple times, after binding. Preferably one without. As such an adhesive, for example, a hot melt adhesive is preferable, and commonly used hot melt adhesives such as a polyolefin hot melt adhesive, a polyamide hot melt adhesive, a polyester adhesive, etc. can be used.

By configuring the back and synthetic resin adhesive layer in this way, by newly heating or reheating the protective cover, it is possible to remove and replace sheets already filed inside the cover, or to introduce additional documents. It becomes possible to do so. The back then adapts to the new thickness of the superimposed sheet or document.

As mentioned above, the protective cover of the present invention is particularly suitable for binding documents of various thicknesses in the form of a file or a bound booklet, and makes it extremely easy to remove a specific part of a document or insert a new document. and without affecting the strength of the file.

The protective cover of the present invention is particularly advantageous when used on files such as specification files and price lists for architectural design firms. It can also be used in the same way when filing large documents at a law firm or notary public's office.

Although embodiments of the protective cover of the present invention will be described based on the drawings, the present invention is not limited to these embodiments.

Figure 1 is a perspective view of an embodiment of the protective cover of the present invention before binding documents, Figure 2 is a cross-sectional view of the protective cover of the present invention fully opened, and Figure 3 is transparent. A perspective view of another embodiment of the protective cover of the present invention having a front cover and a back cover made of synthetic resin,
FIG. 4 is a cross-sectional view of a protective cover of the present invention in which documents are bound using a heating device, FIG. 5 is a plan view of a file produced using the protective cover shown in FIG. 3, and FIG. FIG. 6 is a plan view after inserting an additional sheet into the file shown in FIG. 5; In addition, the first
In Figures 6 to 6, the same parts are designated by the same reference numerals.

The protective cover 1 of the present invention shown in FIGS. 1 to 6 essentially consists of a front cover 2, a back cover 3 and a spine 4,
The front cover 2 and the back cover 3 are joined at their respective side edges. A thermoplastic synthetic resin adhesive layer 5 is provided on the inner surface of the back portion 4.

The front cover 2 and back cover 3 are made of durable paper, for example.
Preferably, it is made from cotton cloth, human silk or synthetic resin. The front and back covers may be transparent or relatively rigid.

The protective cover of the present invention shown in FIGS. 1 and 2 has a front cover 2 and a back cover 3 made of cardboard,
Their side edges are joined to each other by a back part 4, which is an elongated body made of polyvinyl chloride. back 4
The elongated body made of polyvinyl chloride forming the thermoplastic synthetic resin adhesive layer 5 has a thermoplastic synthetic resin adhesive layer 5.

In the embodiment shown in FIG. 1, the protective cover 1 according to the invention further comprises two so-called dirt-proof sheets 7 made of transparent polyvinyl chloride foil.

In a preferred embodiment of the protective cover of the invention shown in FIG. 3, both the front cover 2 and the back cover 3 are transparent foils made of flexible synthetic resin, for example polyvinyl chloride or polyvinyl acetate. The back portion 4 is made of a thermoplastic synthetic resin having sufficient rigidity at room temperature, and has a thermoplastic synthetic resin adhesive layer 5 on its inner surface. The adhesive layer 5 is formed by extrusion, or by mechanically fixing or pasting.

To file documents 8, for example individual sheets or bundles, the documents are stacked, arranged evenly on a flat base plate, and inserted into a protective cover as shown in FIG. The whole is then heated to the melting point of the adhesive layer 5. The heating is preferably carried out in a heating device 9 comprising, for example, two plates 10 and a heatable bottom plate 11 arranged slightly in the shape of a funnel on the outside of the front and back covers.

To bind sheets and/or documents to the protective cover 1, first, the protective cover 1 with the document 8 sandwiched therebetween is attached between the bowl-shaped plates 10, and the document 8 is pressed. The adhesive layer 5 and the back 4 are then softened by heat radiated from the plate 10 and the bottom plate 11, which are electrically heated to a temperature slightly higher than their melting point or fluidization temperature.
Glue the document to the back. The spine 4 then has a spine width equal to the thickness of the superimposed documents to be filed, and the remainder of the spine forms two parallel folds 12 and forms flanks that follow the front cover 2 and the back cover 3. The folds 12 thus formed remain intact as an extension of the back 4 when cooled to room temperature.

Since the back 4 of the protective cover 1 of the invention precisely adapts to the thickness of the stacked documents to be filed, the finished file has much greater strength than that produced by conventional methods. . Furthermore, the file produced in this manner has a beautiful appearance.

The protective cover of the present invention allows you to easily heat the file at any time to remove the documents bound in the file, insert additional documents or documents, or rearrange the documents in the file. It has the advantage of That is, when the adhesive layer 5 is heated to a predetermined temperature, the adhesive becomes fluid again, so that the already bound documents 8 can be removed or additional sheets or documents 13 can be inserted. In that case, back 4
becomes the spine width equal to the new width of the stacked documents each time.

Also, when the spine is provided with longitudinal grooves, the formation of folds is facilitated and changes in the thickness of stacked documents to be filed can be easily accommodated.

[Brief explanation of drawings]

Figure 1 is a perspective view of an embodiment of the protective cover of the present invention before binding documents, Figure 2 is a cross-sectional view of the protective cover of the present invention fully opened, and Figure 3 is transparent. A perspective view of another embodiment of the protective cover of the present invention having a front cover and a back cover made of synthetic resin,
FIG. 4 is a cross-sectional view of a protective cover of the present invention in which documents are bound using a heating device, FIG. 5 is a plan view of a file produced using the protective cover shown in FIG. 3, and FIG. FIG. 6 is a plan view after inserting an additional sheet into the file shown in FIG. 5; (Main symbols in the drawing), 1: Protective cover, 2: Front cover, 3: Back cover, 4: Back, 5: Thermoplastic synthetic resin adhesive, 8: Document, 9: Heating device, 12: Fold, 13 : Additional documents.

Claims (1)

[Scope of Claims] 1. Consisting of a cover front cover, a cover back cover, and a back part joining the two covers at their side edges, the inner surface of the back part is provided with a thermoplastic synthetic resin adhesive layer, and the bundle A document protection cover for binding documents that have been bonded together using the adhesive layer, wherein: (1) the back portion is made of a thermoplastic synthetic resin that is substantially solid at room temperature and has sufficient adhesive properties at room temperature; (2) The back portion is softened together with the thermoplastic synthetic resin adhesive layer by heating to form folded portions parallel to each other at intervals equal to the thickness of the documents to be bound. It holds the documents to be bound, maintains the bent part that fits the bound documents after cooling to room temperature, and (3) the back part is softened again together with the thermoplastic synthetic resin adhesive layer by reheating. , a protective cover that is characterized by making it possible to add and remove documents. 2. The protective cover according to claim 1, wherein the back portion is an elongated body made of thermoplastic synthetic resin having sufficient rigidity at room temperature.