JP4349084B2 - File cover - Google Patents

Description

  The present invention relates to a file for binding documents such as a form, a file cover used for the file, and a backing plastic sheet.

  Conventionally, files for binding documents such as forms have been widely used (Patent Document 1). This type of file basically includes a file cover 30 processed from rectangular paperboard and a binding tool 31 attached thereto. The file cover body 30 is provided with grooves 32 and 33 that function as hinge portions, and a rectangular back cover portion 34 is formed between the grooves 32 and 33. Further, a front cover portion 35 and a back cover portion 36 are connected to the grooves 32 and 33, respectively.

  Also, as shown in FIG. 3B (cross-sectional view taken along the line XX of the front cover portion 35) for the purpose of improving the design of such a file, preventing dirt, improving strength, improving friction resistance, and the like. In addition, a polyolefin paper in which a polyolefin resin layer and a thin paper layer are laminated on the outer surface of the paperboard 37 is adhered as an exterior sheet 38 (case cover sheet) from the thin paper layer side using an adhesive. Here, the peripheral edge 38 a of the exterior sheet 38 is bonded to the inner peripheral edge of the file cover 30 so as to surround the peripheral edge of the file cover 30. Further, a backing sheet 39 is adhered to the inner surface of the file cover 30 with an adhesive so as to cover the peripheral edge 38b of the peripheral edge 38a of the exterior sheet 38 folded (Patent Document 2). On the surface of the backing sheet 39, it is necessary to print information such as a pattern, a use of a file, a disposal method, an applied document size, and the like. Therefore, a paper material having excellent printability is used as the backing sheet 39. . Note that a glue adhesive having a good initial tack property is conventionally used for bonding the exterior sheet 38.

  As the binding tool 31 for binding a document, various types of structures such as a ring-type binding tool and a pipe-type binding tool are actually used, and a type that can be attached to and detached from a file cover is proposed. (Patent Document 3). Note that the binding tool 31 may be provided not on the spine cover 34 but on the front cover 35 or the back cover 36.

By the way, since the polyolefin paper used as the exterior sheet 38 is formed by laminating paper and polyolefin, it is difficult to lower the unit price thereof. For this reason, instead of the polyolefin paper, mainly including polypropylene having a relatively low unit price. It has been proposed to use a polyolefin-based resin film (polyolefin-based cover sheet) (Patent Document 4).
JP 2000-108566 A JP 9-142072 A Japanese Patent No. 2902987 JP 2000-085263 A

However, as the outer sheet 38, when manufactured a file using a polyolefin resin film (polyolefin case binding cover sheet) instead of the polyolefin papers, over time the outer front cover 35 and back cover 36, respectively There was a problem of warping (see FIG. 4). This problem was particularly noticeable in the case of landscape files.

  An object of the present invention is to prevent the front cover portion and the back cover portion from being warped even when a polyolefin resin film is used as an exterior sheet (case cover sheet) of a file.

  The inventors have caused the warpage of the front cover part and the back cover part not from the polyolefin-based case cover sheet side, but substantially due to moisture absorption and release of the paperboard from the backing sheet side made of paper material, Assuming that the environmental humidity of the glue adhesive thin film decreases, and that the glue adhesive thin film shrinks as a result, if there is no substantial release of paperboard moisture from the backing sheet side, Based on the hypothesis that the adhesive thin film does not shrink and therefore the front cover and back cover do not warp, it is assumed that moisture release of the paperboard does not substantially occur from the backing sheet side. Therefore, as a material for the backing sheet, instead of the conventional paper material showing a moisture permeability of about 800 times the moisture permeability of the exterior sheet, when using a plastic material of about 200 times or less, Front cover and back Parts was substantially found that not warped outwardly, thereby completing the present invention.

That is, the present invention provides a rectangular spine portion, a pair of hinge portions positioned on a pair of opposite sides of the spine portion, a cover portion connected to one of the pair of hinge portions, and a pair of hinge portions. A file cover body having a back cover portion connected to the other and using paperboard as a core material,
A polyolefin wrapping cover sheet is adhered to one side of the paperboard with a glue adhesive, and a backing plastic sheet is bonded to the other side of the paperboard, provided that the periphery of the polyolefin wrapping cover sheet is Bonded to the peripheral edge of the other side of the paperboard so as to wrap around the peripheral edge of the paperboard, the backing plastic sheet is attached to the peripheral edge of the other surface of the paperboard. Is attached to the other side of the paperboard to cover
Provided is a file cover body in which the moisture permeability of the backing plastic sheet is 200 times or less of the moisture permeability of the polyolefin case cover sheet.

  The present invention also provides a file in which a binding tool is provided on the back-coated plastic sheet surface of the above-described file cover.

Furthermore, the present invention provides a backed plastic sheet constituting the above-mentioned file cover body, which is a backed plastic sheet made of a polyolefin-based sheet having a moisture permeability of 200 g / m ² · 24 hr or less according to JIS Z0208.

  Since the file cover body and the file of the present invention use a plastic sheet with a moisture permeability not exceeding 200 times that of the polyolefin case cover sheet as a backing plastic sheet to be affixed to the inner surface of the file cover body and the file, the cover sheet is extremely difficult to warp. Part and back cover part.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In each figure, the same numerals indicate the same or equivalent components.

  A perspective view of an example of the file of the present invention is shown in FIG.

  The file in FIG. 1 basically includes a file cover body 100 processed from rectangular paperboard and a binding tool 1 attached thereto. In this file cover body 100, relatively shallow grooves 2 and 3 that function as hinge portions are provided, for example, by pressing in a substantially central region, and a rectangular back cover portion between these grooves 2 and 3 is provided. 4 A pipe-type binding tool is provided as a binding tool 1 on the surface (inner surface) on the side of the back cover portion 4 on which a document is bound. As the binding tool 1, a pipe-type binding tool or a known structure such as a ring-type binding tool can be used. Further, the binding tool 1 may be provided not on the back cover portion 4 but on the front cover portion 5 or the back cover portion 6 according to a mechanism for binding the document. Note that the binding tool 1 may be detachably attached to the file cover body 100. Examples of the detachable binding tool 1 include those disclosed in claim 1 of Patent Document 3 (Japanese Patent No. 2902987).

  A front cover portion 5 and a back cover portion 6 are connected to the grooves 2 and 3, respectively. On the outer surface of the file cover body 100, as shown in FIG. 1B (cross-sectional view taken along the line XX of the cover portion 5), the outer surface of the paperboard 7 is taken into consideration in consideration of wear resistance, concealment properties, and the like. The polyolefin case cover sheet 8 is bonded, and the peripheral edge 8 a is folded and bonded to the inner surface side of the file cover body 100. Then, a backing plastic sheet 9 is bonded to the inner surface of the file cover body 100 so as to cover the peripheral edge 8b of the peripheral edge 8a of the polyolefin case cover sheet 8 that is folded.

  Examples of the polyolefin case cover sheet 8 as an exterior sheet adhered to the outer surface of the file cover body 100 include the conventionally known polypropylene and propylene-ethylene copolymers, as well as the aforementioned Patent Document 4 (Japanese Patent Laid-Open No. 2000-85263). It is also possible to use the same cover cloth as the case cover book cloth described in claims 1 to 8 of the publication. In particular, a preferable structure of the file cover body 100 includes a laminated structure of a polyolefin case cover sheet / paperboard / backing plastic sheet in terms of strength, design and the like.

  The polyolefin case cover sheet 8 is adhered to the file cover body 100 using a glue adhesive. The reason for using the glue adhesive is that it has a good initial tack property and the property that the tack property is recovered by heating until it is completely cured.

  In the present invention, in order to suppress moisture absorption and release from the back-coated plastic sheet 9 side, the moisture permeability of the back-coated plastic sheet 9 is preferably 200 times or less that of the polyolefin case cover sheet 8. More preferably, 10 times or less is used. Such a polyolefin-based sheet can appropriately contain a filler such as talc and calcium carbonate, a pigment such as carbon black and phthalocyanine blue, and an antistatic agent such as a nonionic surfactant, as necessary. .

  Further, the adhesive surface (side surface of the paperboard 7) of the backing plastic sheet 9 has a wetting tension according to JIS K 6768 of at least 46 mN / m or more, preferably 54 mN / m or more in order to secure the adhesive strength with the paperboard 7. In order to set the wetting tension to 46 mN / m or more, the adhesive surface of the backing plastic sheet 9 is subjected to surface activation treatment such as corona discharge treatment, plasma discharge treatment, flame treatment, electron beam irradiation treatment, chemical treatment, etc. Is preferred. In this case, the non-adhesive surface of the backing plastic sheet 9 is also subjected to the same surface activation treatment so that the wetting tension according to JIS K 6768 is at least 39 mN / m or more, preferably 46 mN / m or more.

  As such a backing plastic sheet 9, it is preferable to use a polyolefin-based sheet, a polyvinyl chloride sheet, a polyester sheet, etc. that show lower moisture permeability than the paper material. From the viewpoint of low raw material costs and ease of processing, a polyolefin-based sheet can be preferably used. Preferred examples of the polyolefin-based sheet include a polypropylene sheet, a propylene-ethylene copolymer sheet, a polyethylene sheet, and a laminated sheet thereof. Such a polyolefin-based sheet can appropriately contain a filler such as talc and calcium carbonate, a pigment such as carbon black, an antistatic agent such as a nonionic surfactant, and the like as necessary.

  The thickness of the back-attached plastic sheet 9 is preferably 80 to 160 [mu] m, more preferably 90 to 140 [mu] m, because if it is too thin, there is no waist and the pasting process becomes difficult, and if it is too thick, the material cost increases.

  As shown in FIG. 1C, which is a partially enlarged cross-sectional view, it is preferable to provide a printed layer 11 via a primer layer 10 on the backed plastic sheet 9 in the present invention. Thereby, necessary information can be described in the file.

As the primer layer 10, a film formed from a known primer composition according to the material of the backing plastic sheet 9 can be used. For example, when a polyolefin sheet is used as the backing plastic sheet 9, a film formed from a known primer composition for a polyolefin resin can be used. For example, a two-component curable urethane primer is used as a resin solid What was formed into a film so that it might become 0.5-2.0 g / m < ² > in minutes conversion can be used preferably. Here, as a film forming method, a known film forming method such as a gravure printing method can be employed.

  The printing layer 11 can be formed from printing ink that can be printed on the backed plastic sheet 9. When the backing plastic sheet 9 is a polyolefin-based sheet, 10 to 15% by weight of a binder resin (for example, polyurethane resin) and 0.3 to 0.7% by weight of a colorant (for example, carbon black, phthalocyanine) Blue), 0.05 to 0.1 wt% slip agent (e.g. polyethylene wax), 1 to 2 wt% antistatic agent (e.g. nonionic surfactant), 80 to 90 wt% And an organic solvent (for example, dimethylformamide, methyl ethyl ketone) formed from a printing ink. Such a printing ink may contain 1.5 to 2.0% by weight of a crosslinking agent (for example, an isocyanate-based crosslinking agent) as necessary.

  The printing layer 11 can be formed using a known method such as a gravure printing method or a screen printing method.

  When a colored primer layer is used, the colored primer layer 10 can also serve as the printing layer 11. In addition, a known top coat layer can be provided on the print layer 11 for the purpose of improving the wear resistance of the surface.

  The backing plastic sheet 9 can be adhered to the file cover 100 by selecting from among known adhesives, but in terms of adhesion and workability, an emulsion-based adhesive, for example, It is preferable to adhere using an ethylene-vinyl acetate emulsion adhesive, an acrylic emulsion adhesive or the like.

  The backing plastic sheet 9 described above is very useful as a backing plastic sheet for sticking to the inner surface of the file cover of the file as shown in FIG.

  As the material of the paperboard 7 as the core material of the file cover 100 of the file of the present invention, the same paperboard as the file cover of a normal file such as cardboard, processed paper, resin-impregnated paper or the like can be used. In addition, if the thickness of the present invention can preferably exhibit the effect of the present invention, the warp can be corrected by hand relatively easily if it is too thin. On the other hand, if the thickness is too thick, the rigidity of the paperboard is strong and the warp hardly occurs in the first place. The thickness is preferably 1.5 to 3.0 mm.

  Grooves 2 and 3 functioning as hinge portions provided in a substantially central region of the file cover body 100 are formed between a female mold provided with a line-shaped concave portion and a male mold provided with a line-shaped convex portion. It can be formed by sandwiching and pressing the cover body 100.

  The file of the present invention can be manufactured by a conventional method. For example, apply a glue adhesive to a polyolefin case cover sheet, which is an exterior sheet for a file cover body, and apply it to one side of the paperboard (the outer surface of the file) that is slightly smaller than the exterior sheet. The edge of the case cover sheet that protrudes is folded and pasted on the other side of the paperboard (the inner side of the file, that is, the side that contacts the document). Next, an emulsion adhesive is applied to the backing plastic sheet, and a file cover is produced by sticking it on the other side of the paperboard so as to cover the peripheral edge of the peripheral edge of the case cover sheet. Next, two grooves to be the hinge part are formed by press forming, a binding tool is attached, and the front cover part and the back cover part of the file cover body are bent at the groove part that is the hinge. This completes the file. If necessary, immediately after attaching the binding tool, a back heading film may be welded to the spine cover and the back heading paper may be inserted. Further, an index sheet may be attached to the binding tool.

  Hereinafter, the file cover body and the file of the present invention will be described in detail with reference to examples.

Example 1
20 parts by weight of talc, 10 parts by weight of pigment, and 2 parts by weight of a nonionic antistatic agent are kneaded with 80 parts by weight of a polypropylene homopolymer having a melt flow rate of 7 g / 10 min. The corona discharge treatment was performed under conditions that ensure a wetting tension of m or more.

With respect to the obtained back-attached plastic sheet, the moisture permeability was evaluated according to JIS Z 0208. As a result, it was 4 g / m ² · 24 hrs. When the wetting tension of the backed plastic sheet was evaluated according to JIS K 6768, the surface was 48 mN / m and the back surface was 58 mN / m.

A two-component curable urethane-based primer was applied to the surface of the obtained backed plastic sheet with a gravure printing press so that the resin solid content was 1 g / m ² and dried at 100 ° C. to form a primer layer.

  On this primer layer, a pattern is printed with a paint comprising a polyurethane resin, a colorant, polyethylene wax, a nonionic antistatic agent, an isocyanate-based cross-linking agent, and an organic solvent (DMF / MEK), and then a sheet of a prescribed size is formed. Cut to prepare a backing sheet.

A polypropylene sheet with a thickness of 130 μm as a polyolefin-based case cover sheet (that is, an exterior sheet) on the surface of a 2.1 mm thick paperboard (Dynic Co., Ltd .; moisture permeability according to JIS Z 0208 = 3 g / m ² · 24 hrs; JIS K 6768 wetting tension = 60 mN / m) was attached with a glue adhesive, and was further folded and attached to the periphery of the back of the paperboard so that the paperboard was wrapped around the periphery of the sheet. After this treatment, the back-coated plastic sheet prepared previously was adhered to the back surface of the paperboard with a vinyl acetate emulsion so as to cover the peripheral edge portion of the polypropylene sheet on the back surface of the paperboard to obtain a laminate.

  A file cover body was prepared by forming two shallow grooves to be the hinge portion on the obtained laminate by streaking. A pipe-type binding tool is attached as a document binding tool between the two hinges on the side of the back cover plastic sheet of the obtained file cover body, and the back cover pocket is welded to the cover part at the hinge part. The back cover part was folded to the binding tool side to produce an A3 horizontal file as shown in FIG.

Comparative Example 1
Instead of the backing sheet of Example 1, a resin-impregnated paper (moisture permeability according to JIS Z 0208 = 2400 g / m ² · 24 hrs; wetting tension of JIS K 6768 = 73 mN / m) backing sheet (without corona discharge treatment) And a file cover was produced by the same operation as in Example 1, and an A3 horizontal file was produced.

(Evaluation)
Example 1 and Comparative Example 1 After performing an environmental change test of transferring files from the office to a winter warehouse environment of 10 ° C./55% RH, as shown in FIG. 2, the front cover part and back cover part of the file The warpage of was evaluated. Specifically, the file was made to stand on the desk, and the amount of change (warpage) L1 and L2 deviating from the straight line connecting the front end portion and the groove of the front cover portion and the back cover portion was measured. Here, in practice, the distances L1 and L2 are each desirably 5 mm or less. The obtained results are shown in Table 1.

  In the file of Example 1, since the moisture permeability of the backed plastic sheet is 200 times or less (1.3 times) the moisture permeability of the polyolefin case cover sheet, the distance indicating the warpage of the front cover part and the back cover part L1 and L2 were 0.8 mm and 1.0 mm, respectively, and there was no problem in practical use. On the other hand, in the file of Comparative Example 1, the moisture permeability of the backing sheet greatly exceeds 200 times the moisture permeability of the polyolefin case cover sheet, so the distance L between the front cover part and the back cover part greatly exceeds 5 mm. The commercial value was significantly lowered and not suitable for practical use.

File cover body and the file of the present invention, as backing plastic sheet pasted on the inner surface thereof, because it uses one of 200 times or less of the low moisture permeability of the moisture permeability of the polyolefin-based case binding cover sheet, the front cover portion In addition, the back cover part is extremely difficult to warp. Therefore, it is extremely useful as an A3 horizontal type file or an A4 horizontal type file.

In the perspective view (the figure (a)) of the file of this invention, the expanded sectional view (the figure (b)) of the front cover part, the partial section schematic diagram (the figure (c)) of the backing plastic sheet used for it is there. It is explanatory drawing of the curvature evaluation of a file. It is the perspective view (the figure (a)) of the conventional file, and the partial expanded sectional view (the figure (b)) of the cover cover part. It is state explanatory drawing of the curvature of the conventional file.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Binding tool 2, 3 Grooves 4 Back cover part 5 Front cover part 6 Back cover part 7 Board paper 8 Polyolefin-type case cover sheet 9 Backing plastic sheet 10 Primer layer 11 Print layer 100 File cover body

Claims (8)

A rectangular spine portion, a pair of hinge portions located on a pair of opposite sides of the spine portion, a front cover portion connected to one of the pair of hinge portions, and a back surface connected to the other of the pair of hinge portions A file cover body having a cover portion and using paperboard as a core material,
A polyolefin wrapping cover sheet is bonded to one side of the paperboard with a glue adhesive, and a backing plastic sheet is bonded to the other side of the paperboard, provided that the periphery of the polyolefin wrapping cover sheet is It is bonded to the peripheral edge of the other side of the paperboard so as to wrap around the peripheral edge of the paperboard, and the backing plastic sheet is attached to the peripheral edge of the other surface of the paperboard. Is attached to the other side of the paperboard to cover
The moisture permeability of the backing plastic sheet is not more than 10 times the moisture permeability of the polyolefin case cover sheet ,
The moisture permeability of the backing plastic sheet according to JIS Z 0208 is 200 g / m ² · 24 hr or less,
The wetting tension of JIS K 6768 on the adhesive surface of the backing plastic sheet is at least 46 mN / m or more,
A file cover body in which the wetting tension of JIS K 6768 on the non-adhesive surface of the backing plastic sheet is at least 39 mN / m or more .   The file cover body according to claim 1, wherein the thickness of the paperboard as a core material is 1.5 to 3.0 mm, and the file cover body is used for a horizontally long file. The file cover body according to claim 1 or 2 , wherein a surface activation treatment is performed on both surfaces of the backing plastic sheet. The file cover body according to any one of claims 1 to 3 , wherein a printed layer is formed on the outer surface of the backing plastic sheet via a primer layer made of a urethane-based adhesive. The file cover body according to claim 4 , wherein the print layer is formed from an ink containing a binder resin, a colorant, a crosslinking agent, a slip agent, and an antistatic agent. The file cover body according to any one of claims 1 to 5 , wherein the backing plastic sheet is a polyolefin-based sheet. A file in which a binding tool is provided on the back-coated plastic sheet surface of the file cover body according to any one of claims 1 to 6 . The file according to claim 7 , wherein the binding tool is detachably provided.

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