JP2001334785A - Resin-made paper folder and manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a directly printable resin-made paper folder by a printer usable for an ink jet or the like without the need of sticking a sheet of printed paper or the like, and a manufacturing method. SOLUTION: In the flat rectangular resin-made paper folder in which two sides extended from a single angular corner A are assigned as sealed portions 11, 12, an ink receptive layer having a water absorbing property or an oil absorbing property is formed on at least a part of the surface 13 and specified to have that the hardness of a pencil is H degree, the gross thickness is 0.05 to 2 mm and the thickness of the ink receptive layer is 0.2 mm or less (when dried).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a resin document folder and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, with the spread of computers and inkjet printers, clean printing can be easily performed at home.
With the spread of digital still cameras and home movies, it has become common for individuals to easily print images and the like, as well as to be able to do so quickly. As an inkjet medium for printing such an image, paper is generally dominant, and various types are commercially available.

[0003]

However, it is difficult to cleanly attach an ink jet medium such as paper to another molded product. Although label sheets for ink jet printers are also commercially available, there is a possibility that a problem such as peeling off or sticking of the adhesive on the molded article and contaminating the molded article after sticking to the molded article may occur. .
Further, in the case of a large area, air tends to remain between the surface of the molded article and the label sheet, and it is difficult to apply the air cleanly.

[0004] On the other hand, a method of directly printing on a molded article instead of pasting paper or the like is conceivable. However, since the surface of the molded article generally has a poor ink absorbing ability, it is difficult to perform free printing and writing. is there.

An object of the present invention is to provide a resin-made document folder which can be directly printed by a printer such as an ink-jet printer without the need to attach printed paper or the like, and a method of manufacturing the same.

[0006]

The object of the present invention is to achieve the above object by providing a water absorbing or oil absorbing ink receiving layer on the surface of a resin document folder. Specifically, the resin document folder according to the present invention is a flat rectangular resin document folder in which two sides extending from one corner are sealed, and has water absorbency or oil absorbency. Having an ink receiving layer on at least a part of the surface, having a pencil hardness of H or more, a total thickness of 0.05 to 2 mm,
The thickness of the ink receiving layer is 0.2 mm or less (when dried).

Here, the two sealing portions in the resin document folder may be formed by heat welding two sides of the two sheets, and one sheet is bent to form a fold. The fold may be used as one sealing portion, and one side extending from the end of the fold may be formed by heat welding.

In the present invention, as the ink receiving layer,
Various types including a resin binder and ink absorbing particles can be used. Here, as the resin binder, for example, a polyester-based emulsion, a urethane-based emulsion, an acrylic-based emulsion, or the like can be employed. These resin binders are preferably used by being mixed with a solvent. Examples of the solvent include water,
Alcohol, butyl cellosolve and the like can be used.

On the other hand, the ink-absorbing particles are not particularly limited as long as they absorb the attached ink and develop the color of the ink, and various organic ink-absorbing particles and inorganic ink-absorbing particles can be employed. Examples of the organic ink absorbing particles include cellulose powder, starch, chitosan, alginic acid, silk powder, collagen powder, and the like. In addition, examples of the inorganic ink absorbing particles include calcium carbonate, silica, and talc. The average particle size of the ink absorbing particles used is 1 to 30 μm.
m is preferable. The mixing ratio of the resin binder and the ink absorbing particles is not particularly limited as long as good ink receiving layer strength and ink absorbing performance are exhibited. Binder = 40/60 to 90/10.

Further, as the ink receiving layer, a resin having an ink absorbing ability, a collagen (gelatin) having a water absorbing property, or the like can be used. Examples of the resin having an ink absorbing ability include polyvinyl alcohol and sodium acrylate. When a resin or collagen having an ink absorbing ability is used, only the resin or collagen can be used alone. However, in order to prevent surface blocking, a filler such as silica is added in an amount of 0.1 to 5% by weight. preferable. The ink receiving layer only needs to be present at least on a part of the surface of the resin document folder, and its position, area, and the like can be set as appropriate according to the use and the like.

[0011] The ink receiving layer of the present invention comprises a base material sheet before molding into a document folder and a resin document after molding, in which a resin binder and ink-absorbing particles or a resin having ink-absorbing performance mixed in the above ratio are formed. The folder is formed by performing printing such as coating with a knife coater or a die coater, or screen printing.

At this time, if the thickness of the ink receiving layer (when dried) exceeds 2.0 mm, drying after coating may be delayed and productivity may be reduced. Moreover, the thickness of the folder is too large to keep the flexibility of the resin document folder, and the possibility that the ink receiving layer is peeled off when the folder is bent increases. More preferably, it is 0.1 mm or less (at the time of drying), especially 0.005 mm (5 μm) to
Even more preferably, it is 0.05 mm. In addition,
When the thickness is less than 0.005 mm, the number of ink-absorbing components with respect to the amount of ink is small, so that the water absorption and oil absorption become insufficient, the drying time becomes longer, and the possibility of bleeding after printing increases.

The pencil hardness is defined by JIS K-540.
It is a value measured by a method based on 0. Here, the pencil strength is a strength in consideration of the hardness and thickness of the ink receiving layer and the adhesion between the ink receiving layer and the base sheet constituting the folder. That is, in the pencil hardness test, H
In the above case, when the surface of the resin document folder is scratched with the test pencil of the concentration symbol of H, the ink receiving layer is not damaged, and the ink receiving layer and the base sheet do not peel off. Means that. If the pencil hardness is HB or less, the printed surface is easily damaged, and the printed content is likely to be difficult to determine, which is not practical.

Further, the total thickness is a thickness obtained by adding all of the ink receiving layer and the base sheet.
If it exceeds 2 mm, it may hinder paper feeding during printer printing, which is not practical. In order to smoothly feed the paper, the total thickness is more preferably 1 mm or less, still more preferably 0.5 mm or less, and further preferably 0.25 mm or less.

The material resin of the resin base sheet constituting the document folder is not particularly limited, and various resins having rigidity and durability according to the use and the like can be selected. , A polypropylene resin, a polyethylene resin, a vinylidene chloride resin, or the like.

According to the present invention, the ink receiving layer having water absorbing or oil absorbing properties is provided on at least a part of the surface, the pencil hardness is H or more, the total thickness is 0.05 to 2 mm, and the thickness of the ink receiving layer is 0. .2 mm or less (when dry) is a resin document folder. Therefore, it is possible to freely write and print with either oil-based or water-based ink, and it is possible to provide a document folder in which the ink hardly bleeds and the surface strength of the ink receiving layer is high. This makes it possible to print easily with a printer such as an ink jet printer, so that the contents of the documents stored in the folder can be easily displayed in an easy-to-understand manner. Further, by adjusting the heat resistance of the ink receiving layer, printing by a thermal transfer printer can be performed.

In the above, one of the two sealing portions is formed by a fold obtained by bending a base sheet,
In the case where the other is formed by a seal portion formed by heat welding, when this seal portion is suspended with the seal portion facing upward, the opening is opposite to the seal portion and 5 m from the fold.
m, the separation width between the overlapping resin sheets is 5
mm or less. If the separation width is larger than 5 mm, paper feeding during printer printing may be hindered, such as jamming inside the printer. In addition, the opening end of the resin document folder easily spreads at the time of printing, so that the possibility of printing failure increases. Further, the widened opening may come into contact with a movable part such as a printer head, which may cause damage to the printer. That is, the separation width is 5
When the thickness is equal to or less than mm, printing can be performed smoothly, and the finish of printing can be improved.

The resin document folder according to the present invention is a rectangular resin document folder having three sides extending from two adjacent corners serving as sealing portions and having a water absorbing property or an oil absorbing property. Having an ink receiving layer on at least a part of the surface, having a pencil hardness of H or more, a total thickness of 0.05 to 2 mm,
The thickness of the ink receiving layer is 0.2 mm or less (when dried). Here, the three sealing portions in the resin-made document folder may be formed by heat-welding the three sides of the two sheets, and one sheet may be folded to form a fold. Two sealing portions may be formed by heat welding two sides extending from the end of the fold. In addition,
The ink receiving layer, pencil hardness, total thickness, and thickness of the ink receiving layer of the present invention are the same as in the case of the resin document folder having the two sealing portions described above.

According to the present invention, the ink receiving layer having water absorbing or oil absorbing properties is provided on at least a part of the surface, the pencil hardness is H or more, the total thickness is 0.05 to 2 mm, and the thickness of the ink receiving layer is 0. .2 mm or less (when dry) is a resin document folder. Therefore, it is possible to freely write and print with either oil-based or water-based ink, and it is possible to provide a document folder in which the ink hardly bleeds and the surface strength of the ink receiving layer is high. Moreover, since the three sides are a resin document folder with a sealed portion, there is no problem that the opening is easy to spread like a resin document folder with two sides as a sealed portion. Problems such as paper jams are less likely to occur.

In the method for manufacturing a resin document folder according to the present invention, an ink receiving layer having a water absorbing property or an oil absorbing property is formed on a surface of a base sheet, and the base sheet is bent to form a fold. One of two sides extending from both ends of the fold is thermally welded to obtain a resin document folder. Here, the ink receiving layer may be applied to the entire surface of the substrate sheet or may be applied to a part thereof. In addition, if the folds are insufficiently formed, the unsealed ends are likely to open, which may hinder paper feeding during printer printing.

The cutting of the base sheet during the production of the document folder may be performed after forming the ink receiving layer.
You may go before that. The ink receiving layer and the raw material resin of the base sheet are the same as described above.

According to the present invention, after the ink receiving layer is formed on the surface of the base sheet, the document folder is formed.
The document folder can be manufactured more efficiently than the method of forming the ink receiving layer after forming the document folder. Further, since one of the sealing portions is formed by a fold obtained by bending the base sheet, the manufacturing process can be simplified as compared with a method in which the two sealing portions are formed by heat welding.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a resin document folder 1 according to an embodiment of the present invention.
As shown in FIG. 1, the resin document folder 1 is formed in a planar rectangular shape in which two sides extending from one corner A are sealed. Here, one of the two sealing portions is formed by a fold 11 obtained by bending one resin sheet 10. In addition, the other one of the sealing portions is configured such that each of the sheets 10 that are bent and overlapped with the above-described folds 11 is overlapped with each other.
One side extending from the corner A, which is the end of the fold 11, is formed by a seal portion 12 which is thermally welded.

As shown in FIG. 2, the resin sheet 10 includes a base sheet 10B and a water-absorbing or oil-absorbing ink-receiving layer 10A formed on the entire surface thereof. The entire surface 13 of the resin document folder 1 is an ink receiving layer 10A. Further, a printing surface 14 is formed on the ink receiving layer 10A by printing using an inkjet printer. The ink receiving layer 10A is formed by applying and drying a coating agent in which a resin binder and ink absorbing particles are mixed at a predetermined ratio.

The resin document folder 1 configured as described above is manufactured as follows. First, the raw material resin is formed into a sheet by T-die extrusion or the like (not shown).
The base sheet 10B is used. On one surface of the formed base sheet 10B, a coating agent prepared by mixing a resin binder and ink absorbing particles at a predetermined ratio is applied by a coater such as a knife coater, and a resin sheet 1 having an ink receiving layer 10A is formed.
Set to 0. At this time, the mixing ratio of the resin binder and the ink absorbing particles is, for example, in a range of 40/60 to 90/10 by weight ratio of ink absorbing particles / resin binder. Also,
The thickness of the ink receiving layer 10A is 0.005 to 0.2 mm
Is applied so that the total thickness of the resin document folder 1 becomes 0.05 to 2 mm. Further, the thickness of the ink receiving layer 10A is adjusted according to the raw material resin, the resin binder, and the like so that the pencil hardness of the surface becomes H or more.

Then, after the resin sheet 10 is cut into a predetermined size, the resin sheet 10 is bent at the center so that the ink receiving layer 10A becomes the surface 13 of the resin document folder 1, thereby forming a fold 11. . Then, one side extending from one end (corner A in FIG. 1) of both ends of the fold 11 is heat-welded to form a seal portion 12, and the resin document folder 1 is obtained. When the obtained resin document folder 1 is suspended with the seal portion 12 facing upward, the seal portion 12
5 mm from the fold on the open end 15 facing
At the position B, the fold 11 is formed so that the separation width C between the overlapping base sheets 10B (resin sheets 10) is 5 mm or less (see FIG. 3).

In forming the printing surface 14 on the ink receiving layer 10A of the resin document folder 1 thus obtained, an appropriate number of the resin document folders 1 are stacked and set in a feeder of an ink jet printer. hand,
Printing will be performed.

According to the above-described embodiment, the following effects can be obtained. (1) A water-absorbing or oil-absorbing ink receiving layer 10A is provided on the entire surface 13 of the resin document folder 1, has a pencil hardness of H or more, a total thickness of 0.05 to 2 mm, and a thickness of the ink receiving layer 10A. This is a resin document folder 1 of 0.2 mm or less (at the time of drying). Therefore, the entire surface 13 of the resin folder 1 can be freely described and printed using oily or water-based ink, the ink does not easily bleed, and the surface of the ink receiving layer 10A has a high surface strength. 1 can be provided. This makes it possible to print easily with a printer such as an ink jet printer, so that the contents of the documents stored in the folder can be easily displayed in an easy-to-understand manner.

(2) Since the pencil hardness is H or more,
The resin document folder 1 having a high surface strength and in which the ink receiving layer 10A is difficult to peel off from the base sheet 10B can be obtained. (3) Since the total thickness is 0.05 to 2 mm, the paper can be smoothly fed in the ink jet printer, and there is little possibility that a problem such as a paper jam occurs. (4) The thickness of the ink receiving layer 10A is 0.005 to 0.2.
mm, it dries quickly after coating, and the productivity can be improved. In addition, when the resin document folder 1 is bent, the problem that the ink receiving layer 10A peels off can be reduced, and bleeding after printing can be prevented.

(5) Since the above-mentioned separation width C is set to 5 mm or less, problems such as clogging in the printer rarely occur, and the opening end 15 of the resin-made document folder 1 becomes wider at the time of printing. , Printing failure, printer damage, etc. can be prevented. (6) Since the ink receiving layer 10A is formed on the entire surface 13 of the resin-made document folder 1 and then cut, bent, and heat-welded to form the document folder 1, the ink receiving layer is formed for each document folder after the document folder is formed. Manufacturing efficiency can be improved as compared with the method of forming a layer. (7) Since one of the two sealing portions is formed by the fold 11 obtained by bending the resin sheet 10 (base sheet 10B), compared with a method in which the two sealing portions are formed by heat welding. In addition, the manufacturing process can be simplified.

It should be noted that the present invention is not limited to the above embodiment, and modifications and improvements as long as the object of the present invention can be achieved are included in the present invention. For example, in the above embodiment, the ink receiving layer 10A is formed on the entire surface 13 of the resin document folder 1, but is not limited to this. That is, it may be formed at least in a portion where printing is performed by a printer or the like, and its position, area, and the like can be arbitrarily set. In addition, the ink receiving layer 1
OA was formed by a coating agent in which a resin binder and ink-absorbing particles were mixed, but is not limited to this. That is, it can also be formed by using a resin having ink absorption performance. When using a resin having such an ink absorption performance, an inorganic filler may be added in an amount of 0.1 to 5 wt% in order to prevent surface blocking.

In the above-described embodiment, one of the two sealing portions of the resin document folder 1 is formed by the fold 11, but the present invention is not limited to this, and both of the sealing portions may be formed by heat welding. It is possible. Along with this, as for the method of manufacturing the resin-made document folder, a method of thermally welding two sides sharing one corner of two resin sheets may be used. Further, the printing surface 14 is formed by printing with an ink jet printer, but is not limited thereto, and another printer may be used. For example, by adjusting the heat resistance of the ink receiving layer, printing by a thermal transfer printer becomes possible.

In the above embodiment, the resin document folder 1
Is used in which two sides extending from one corner A are sealing portions, but the present invention is not limited to this.
Alternatively, a resin document folder having three sides extending from the two corners as sealing portions may be used. In addition, the specific structure, shape, and the like when implementing the present invention may be other structures within a range that can achieve the object of the present invention.

[0034]

The present invention will now be described more specifically with reference to examples and comparative examples. In addition, as the coating agent for forming the ink receiving layer, a coating material containing a resin binder, ink absorbing particles, and the like as described below was used.

[Coating composition] [1] Resin binder (urethane emulsion): Superflex 460 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), 50 g [2] Ink absorbing particles: protein powder (Idemitsu Petrochemical Co., Ltd.) Made), 80g [3] Water: 60g

Example 1 A 100 μm-thick polyester sheet was used as the base sheet 10B, and the thickness of the ink receiving layer 10A was about 25 μm (when dried).
The coating agent was applied to the surface of the base sheet 10B with a knife coater to obtain a polyester resin sheet 10 having an ink receiving layer 10A. The obtained resin sheet 10 is A3
After cutting to a size, the ink receiving layer 10A was folded at the center so as to become the surface 13 to form a fold 11. Subsequently, one side extending from the end (corner A) of the fold 11 was heat-welded to form a seal portion 12, thereby obtaining a resin document folder 1 (total thickness 250 μm). When this resin-made document folder 1 was hung with the seal portion 12 facing upward, the separation width C between the resin sheets 10 at the position of 5 mm from the fold 11 on the opening end 15 was 5 mm or less.

Example 2 Thickness 22 after easy adhesion treatment
A resin document folder 1 was obtained in the same manner as in Example 1 except that a 5 μm polyethylene base sheet 10B was used (total thickness: 500 μm).

Example 3 Thickness 47 after easy adhesion treatment
A resin document folder 1 was prepared in the same manner as in Example 1 except that a 5 μm polypropylene base sheet 10B was used.
(Total thickness 1.0 mm).

Example 4 Except that the bending was weakened,
In the same manner as in Example 1, a resin document folder 1 was obtained.
When the obtained resin document folder 1 is hung with the seal portion 12 facing upward, the separation width between the resin sheets 10 at the position of 5 mm from the fold 11 on the opening end 15 is 6 m.
m or more.

Comparative Example 1 A resin document folder was obtained (total thickness of 2 mm or more) in the same manner as in Example 1 except that a polyester base sheet having a thickness of about 1 mm was used.

Comparative Example 2 The procedure of Example 1 was repeated, except that Superflex E4000 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was used as the resin binder (the solid content was the same as in Example 1). A resin document folder was obtained.

Comparative Example 3 A resin document folder was obtained in the same manner as in Example 1, except that a 100 μm-thick polypropylene sheet not subjected to an easy-adhesion treatment was used as the base sheet.

The resin-made document folders obtained in the above Examples and Comparative Examples were evaluated for scratch resistance and paper feeding performance, and the results are summarized in Table 1.

[0044]

[Table 1]

Here, each item was measured and evaluated as follows. [1] Scratch resistance Evaluated by pencil hardness according to JIS K-5400. Specifically, the surface of the resin-made document folder was scratched with a pencil of density symbol H, and evaluated according to the following criteria. No exposure of resin sheet: ○ Exposure of resin sheet: ×

[2] Paper Feeding Performance Using a DeskJet 720C (manufactured by Hewlett-Packard Japan Co., Ltd.) as a printer, 10 sets of resin document folders are set in this printer, and continuous printing is performed.
The state of paper feed was checked and evaluated according to the following criteria. Paper feeding was reliably performed for all 10 copies: ○ Paper feeding failed for 2 copies or less of 10 copies: △ Paper feeding failed for 5 copies or more of 10 copies: × [3] Overall evaluation When both of the paper feeding performances were △ or △, ○ was given, and when one or more was x, × was given.

As shown in Table 1, the resin document folders obtained in Examples 1 to 4 had a total thickness of 0.05 to 2 m.
m, the thickness of the ink receiving layer is 0.2 mm or less (when dry) and the pencil hardness is H or more, indicating that there is no practical problem in strength and paper feeding performance. However, in Example 4, when the sheet was hung with the seal portion facing upward, the separation width between the resin sheets at the position 5 mm from the fold on the opening end of the overlapping sheets was 6 mm or more. You can see that it is getting worse.

On the other hand, in Comparative Example 1, since the total thickness of the resin document folder is 2 mm or more, it can be seen that the paper feeding performance is deteriorated. In Comparative Example 2, the film of the ink receiving layer was soft, that is, the pencil hardness of the surface was H or less, and it was found that scratch resistance was poor and not practical. In Comparative Example 3, the ink-receiving layer and the polypropylene base sheet did not adhere to each other because the easy-adhesion treatment was not performed, the strength was insufficient, the scratch resistance was deteriorated, and it was not practical. Understand.

[0049]

According to the present invention, an ink receiving layer having water absorbency or oil absorbency is provided on at least a part of the surface,
The resin document folder has a pencil hardness of H or more, a total thickness of 0.05 to 2 mm, and a thickness of the ink receiving layer of 0.2 mm or less (when dried). Therefore, free description and printing can be performed with either oil-based or aqueous ink,
It is possible to provide a document folder in which ink hardly bleeds and the surface strength of the ink receiving layer is high. This makes it possible to print easily with a printer such as an ink jet printer, so that the contents of the documents stored in the folder can be easily displayed in an easy-to-understand manner.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a resin document folder according to the present invention.

FIG. 2 is a partially enlarged sectional view of the embodiment of FIG.

FIG. 3 is a bottom view in the embodiment of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin document folder 10 Resin sheet 10A Ink receiving layer 10B Base sheet 11 Fold (sealing part) 12 Seal part (sealing part) 15 Open end A Corner corner B 5 mm from fold C Separation width

Claims (6)

[Claims] 1. A flat rectangular resin document folder in which two sides extending from one corner are sealed, and having a water-absorbing or oil-absorbing ink-receiving layer on at least a part of the surface. And a pencil hardness of H or more and a total thickness of 0.
A resin document folder, wherein the thickness is 0.5 to 2 mm and the thickness of the ink receiving layer is 0.2 mm or less (when dry). 2. The resin-made document folder according to claim 1, wherein one of the two sealing portions is formed by a fold obtained by bending a base material sheet, and the other is formed by a sealing portion formed by heat welding. When the seal portion is suspended with the seal portion facing upward, the separation width between the overlapping base material sheets is 5 mm or less on the opening end facing the seal portion and at a position of 5 mm from the fold. A resin document folder, characterized in that: 3. A resin document folder on a flat rectangular shape having three sides extending from two adjacent corners serving as a sealing portion, wherein a water-absorbing or oil-absorbing ink receiving layer is provided on at least a part of the surface. Having a pencil hardness of H or more and a total thickness of 0.
A resin document folder, wherein the thickness is 0.5 to 2 mm and the thickness of the ink receiving layer is 0.2 mm or less (when dry). 4. The resin document folder according to claim 1, wherein the total thickness is 1 mm or less. 5. The resin document folder according to claim 1, wherein said ink receiving layer has a thickness of 0.005 to 0.05 mm.
A resin document folder characterized by the following. 6. An ink receiving layer having a water absorbing property or an oil absorbing property is formed on a surface of a base sheet, and the base sheet is bent to form a fold. A method for producing a resin document folder, wherein one side is thermally welded to obtain a resin document folder.