JP3028893U - Sheet-shaped document holder - Google Patents

Abstract

(57) [Summary] (Correction) [Problem] Sheet-shaped document holder that has high gloss on the outer surface and does not adhere to the inner surfaces of the document holder, and can be colored semi-transparent with a general-purpose masterbatch. Provision of sheet document holders. SOLUTION: The crystalline polypropylene-based polymer or propylene and another α- are formed on the layer (A) of the crystalline polypropylene-based polymer having a flexural modulus of 14000 to 20000 kgf / cm ² due to the stereoregularity of the crystal structure. A layer (B), which is colored by mixing a colorant with a copolymer with an olefin, is superposed, and a crystalline polypropylene polymer or a copolymer of propylene and another α-olefin (C) is transparent on the layer. Layers are stacked and manufactured into a tubular shape by the coextrusion water-cooled inflation method, and one side edge of the tubular sheet cut into a predetermined length is cut to form a rectangular plastic sheet, which is folded in half and folded into two sides. The lower edges 2 adjacent to the folded edge 1 are heat-sealed by ultrasonic waves.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a sheet-like document holder for holding documents between stacked plastic sheets.

[0002]

[Prior art]

 In general, a plastic sheet-like document holder used for easily filing a document has a shape as shown in FIG. 1 or 3.

That is, the sheet-like document holder shown in FIG. 1 is obtained by folding a rectangular plastic sheet as a material and heat-sealing the lower edge portion 2 adjacent to the folding edge 1. The sheet-like document holder shown in Fig. 2 has a heat-sealing band 5 formed with a predetermined width on the side edge facing the folding edge 3 when the plastic sheet as the material is folded in two, and the lower edge adjacent to the side edge is formed. The portion 4 is also closed by heat sealing, and a required number of punch holes 6 for a file are formed in the heat sealing band 5 at equal intervals so that it can be bound to a filing tool (not shown).

The plastic sheet constituting such a sheet-like document holder is composed of a single layer of polyethylene, polypropylene or polyester, which is a thin sheet (also referred to as film) by a well-known inflation method or T-die method. Be processed).

By the way, the characteristic required for the above plastic sheet is that there is no adhesiveness between the two plastic sheets and that it also has appropriate slipperiness, that is, the sandwiched document or thin sheet. It is a characteristic that notes and other materials (hereinafter referred to as documents) can be easily put in and taken out. In order to satisfy such characteristics, a lubricant such as fatty acid amide has been added to the plastic sheet forming the conventional sheet-shaped document holder.

[0006]

[Problems to be solved by the device]

 However, as described above, the conventional sheet-shaped document holder made of a plastic sheet with a lubricant added makes it easier to take in and out documents by increasing the compounding amount of the lubricant, so that the stored documents, etc. However, there is a problem that it becomes easy to move.

In addition, among documents and the like, particularly when a printed matter such as a product catalog or a pamphlet or a photograph is stored, the sheet of the document holder is highly transparent and highly glossy in order to make the stored product look beautiful. Although sheets of high transparency and high gloss are usually easy to adhere to, the inner surface of the sheet-like document holder facing such a sheet is easy to adhere to them. Also, since the surface of printed materials such as pamphlets or the surface of photographs is coated with a smooth soft coat (soft transparent resin film), such a coated surface and the inner surface of the document holder are easily adhered. There is also a problem that it is not easy to take photos in and out of the document holder after storing photos for a long time.

Furthermore, in order to make it easier to identify a plurality of sheet-like document holders and to enhance the function of sorting and organizing and enhancing the aesthetic appearance, it is necessary to color the plastic sheet. In that case, the plastic sheet is colored in a light color so that the stored documents are translucent enough to be seen through.

However, in order to lightly color the plastic sheet, it is necessary to make the dilution ratio of the colorant (pigment) with respect to the plastic raw material around 100: 1 (weight ratio) at a high multiplication factor. However, there is a problem that it is difficult to uniformly disperse the colorant.

In order to make it possible to uniformly disperse the colorant under high-fold dilution conditions, it is considered that a master batch of low concentration may be specially prepared and a large amount thereof may be blended. Not only general-purpose master batches cannot be used, but also the work of preparing low-concentration master batches is complicated, which complicates the manufacturing work, and the large amount of master batches causes economic disadvantages to the product. .

Further, the sheet-like document holder is required to have a function of protecting the document or the like from being bent to some extent (to prevent bending of the waist), so that the rigidity of the sheet needs to be increased to some extent. However, if the rigidity is increased, the sheet becomes brittle. Therefore, it has been difficult to make the sheet-shaped document holder have both the rigidity for preventing the waist from bending and the elastic strength.

Therefore, the first problem of the present invention is that the above-mentioned problems are solved and a document or the like sandwiched between plastic sheets can be easily taken in and out, and the stored document or the like is not easily displaced. It has two contradictory characteristics, and it can make documents such as documents that have a high gloss on the outside look beautiful, and have low adhesion between the insides of the document holders, and also adhere to the surface of photographs and printed materials. It is a sheet-shaped document holder that is difficult to do.

A second object of the present invention is to solve the above-mentioned problems in the sheet-like document holder, and when it is semi-transparently colored in a light color, a general-purpose masterbatch can be used, which is economical. It is to be able to manufacture it.

[0014]

[Means for Solving the Problems]

In order to solve the above-mentioned problems, in the present invention, a plurality of square-shaped synthetic resin sheets are stacked, and at least two adjacent sides of these four sides are integrally fixed to each other. Is a crystalline polypropylene-based polymer or propylene and another layer on top of the layer (A) made of a crystalline polypropylene-based polymer having a flexural modulus of 14000 to 20000 kgf / cm ² due to the stereoregularity of the crystal structure. The (B) layer made of a copolymer with α-olefin was laminated and integrated by a coextrusion water-cooled inflation method. The laminated sheet was laminated so that the (A) layers face each other. .

Alternatively, the sheet comprises a crystalline polypropylene-based polymer (A) having a flexural modulus of 1400 to 20000 kgf / cm ² due to the stereoregularity of the crystal structure, and a crystalline polypropylene-based polymer on the (A) layer. (B) layer in which a colorant is mixed with a polymer or a copolymer of propylene and other poly α-olefins is stacked, and a crystalline polypropylene polymer or propylene and other poly α-olefins are stacked on this (B) layer. A transparent (C) layer composed of a copolymer with an olefin is laminated and integrated by a coextrusion water-cooled inflation method to form a laminated sheet, and the laminated sheets are laminated so that the (A) layers face each other. It was a sheet-shaped document holder.

The layer (A) made of the crystalline polypropylene polymer adopted in the sheet-shaped document holder of the present invention is highly crystallized during the laminated integral molding by the water cooling inflation method, and is expected due to the stereoregularity of the crystal structure. It exhibits a flexural modulus of 14000 to 20000 kgf / cm ² .

That is, the molecular chain of polypropylene that constitutes the layer (A) is folded to have a lamellar structure, which is regularly arranged to form a cubic structure such as a spherulite or a plate crystal. However, due to the stereoregularity of such a crystal structure, so-called mat-like fine irregularities are formed on the surface of the (A) layer.

When such a layer (A) is disposed on the inner surface of the sheet-like document holder, the contact area between the inner surfaces is reduced to prevent the inner surfaces from adhering to each other, and the stored document and the like (A ) The area of contact with the layer also decreases, so that it becomes difficult to adhere to a document such as a photograph having a glossy soft coating layer on the surface thereof.

The fine irregularities on the surface of the layer (A) are considered to increase the frictional resistance when a document or the like stored in a well-known binder or the like is pinched and held. It is difficult for the items to move. It should be noted that when pressure is not applied to the layers (A), the frictional resistance is small due to the decrease in the contact area, so that documents and the like can be easily taken in and out.

In the transparent sheet-shaped document holder of the present invention, (B) is a transparent layer disposed on the outer surface, which is made of a crystalline polypropylene polymer or a copolymer of propylene and other α-olefin. Therefore, the outer surface has high gloss, and the stored documents can be made beautiful by compensating for the non-gloss and semi-transparency of the (A) layer arranged on the inner surface.

Further, the sheet-like document holder having the colored (B) layer of the present invention has the intermediate layer (B) of the layers (A), (B) and (C) constituting the laminated sheet. Since the colorant is mixed only in the layer (b), a light-colored and transparent product can be produced even if the amount of the pigment masterbatch added to the layer (B) is relatively large. As a result, since a general-purpose pigment masterbatch can be used as a coloring agent for plastics, this sheet-shaped document holder does not cause complication of manufacturing work and economical disadvantage.

[0022]

[Embodiment of device]

As described above, the crystalline polypropylene polymer used in the present invention has a flexural modulus of 14000 to 20000 kgf / cm ² due to the stereoregularity of the crystal structure. Such a flexural modulus is a filler. It was not achieved by the addition of or reinforcing agents. Further, the stereoregularity of the crystal structure is not limited to a single crystal structure (spherulite or plate crystal, etc.), and isotactic crystal is used so that polypropylene has a predetermined flexural modulus. It was obtained by appropriately adjusting the fractions. The crystalline polypropylene polymer used in the present invention can be obtained by those skilled in the art by commercially available BF-6006 manufactured by Chisso Corporation.

In such a crystalline polypropylene-based polymer, fine irregularities are uniformly formed on the surface due to the stereoregularity of the crystal structure, and the surface observed by an electron microscope has continuous gentle irregularities. And has a so-called mat shape.

The crystalline propylene-based polymer or the copolymer of propylene and other α-olefins used in the present invention is, for example, a propylene homopolymer polymerized in the presence of a Ziegler-Natta type catalyst, or It consists of a random copolymer, a block copolymer or a graft copolymer of propylene and another α-olefin (ethylene, butene, 4-methylpentene, octene, etc.) or a mixture thereof.

As the colorant used in the present invention, known colorants for plastics can be used without particular limitation. In this case, a commercially available masterbatch having a pigment concentration of about 10% to 40% is used to obtain favorable results.

In each layer used in the coextrusion laminated film of the present invention, antioxidants (phosphorus-based antioxidants, phenol-based antioxidants, etc.) and neutralizers that are usually added to propylene polymers and the like. (Zeolite, hydrotalcite, etc.), antiblocking agents (silica, spherical thermosetting resin, aluminum silicate, etc.), slip agents, antistatic agents, etc. can be used within the range that does not impair the purpose of the present invention. it can.

The method for laminating the coextruded laminated film comprising the layers (A) and (B) or the layers (A), (B) and (C) of the present invention uses two or more extruders. Melt-extruding, laminating in a molten state by a known method such as a co-extrusion multi-layer die method and a feed block method, and a well-known water-cooled inflation method is adopted.

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, in the first embodiment of the present invention, the coextrusion laminated film including the layers (A), (B) and (C) described above is formed into a tubular shape by a coextrusion water-cooled inflation method. A rectangular plastic sheet was formed by cutting one side edge of a tubular sheet that was manufactured into a specified length and cut into a predetermined length. The adjacent lower edges 2 are heat-sealed by ultrasonic waves or the like.

Further, in the second embodiment of the present invention shown in FIG. 3, a coextruded laminated film composed of two layers (A) and (B) is manufactured in a tube shape by a coextrusion water-cooled inflation method. , One side edge of the tubular sheet cut into a predetermined length is cut to form a rectangular plastic sheet, which is folded into two halves so that the sides are overlapped with each other. A heat seal band 5 is formed with a constant width along the side edge facing the edge 4 and the folding edge 3 by ultrasonic waves, etc., and punch holes 6 for files are formed at equal intervals in the heat seal band 5 with a ring (not shown). It can be bound to filing tools.

[0030]

【Example】

The sheet materials and pigment masterbatches used in Examples or Comparative Examples are listed below. The melt flow rate (MFR: g / 10 minutes), slipperiness (low and high), and flexural modulus (kgf / cm ² ) are also shown, and the material symbols a to e used in the table in (). , J, k are shown.

MFR Slidability Flexural Modulus: (g / 10 min) (kgf / cm ² ) (a) Crystalline polypropylene, 6 Low 17000 manufactured by Chisso: BF6006 (b) Crystalline polypropylene, 10 Low 15000 manufactured by Chisso : FM103 (75) HF6028 (25) (c) Crystalline polypropylene, 10 Low 13800, manufactured by Chisso Corporation: FM113 (d) Copolymer of propylene and ethylene, (Copolymer with other α-olefin) 12 High 11000 Chisso: F3008 (e) Copolymer of propylene and ethylene, (Copolymer with other α-olefin) 2.5 Low 10600 Chisso: BF7010 (j) Blue pigment master batch Dainichiseika Product: PP-MA393Z595 (pigment concentration 40% by weight) (k) Blue pigment masterbatch Dainichiseika: PPM -960-781 (pigment concentration 14% by weight).

[Examples 1 to 3 and Comparative Examples 1 to 3] At the compounding ratios (parts by weight) shown in Table 1, the layer (A) was used as the inner layer, the layer (B) was used as the intermediate layer, and the layer (C) was used. Each material is supplied as an outer layer to an extruder, melted at 220 ° C, coextruded from a circular die equipped with three manifolds, and cooled with cooling water at 20 ° C to obtain a thickness of 100μ (composition ratio of inner layer / A tubular laminated sheet having an inner layer / outer layer = 25% / 50% / 25%) and a diameter of 230 mm (fold diameter) was produced by a coextrusion water-cooled inflation method.

One side of the obtained tubular laminated sheet is cut into a half-folded sheet having a width of 220 mm (folded shape), which is cut into a length of 310 mm, and one edge of the cut end is cut. The sheet-shaped document holder shown in FIG. 1 was manufactured by heat sealing.

The physical properties of the document holders of Examples or Comparative Examples were measured and evaluated by the following methods and standards, and these results are also shown in Table 1.

(1) Haze: Measured according to JIS K7105, and the results are shown in%.

(2) Gloss: The outer surface and the inner surface of the holder were measured based on JIS K7105.

(3) Young's modulus: The Young's modulus (g / mm ² ) in the vertical direction of FIG. 1 was determined based on JIS K7127.

(4) Pigment (colorant) dispersibility: Color unevenness of the entire holder was visually observed.

(5) Adhesion of the inner surface of the holder: The extent of the sticky feeling on the inner surface of the holder was examined by the feel of the fingertip.

(6) The ease of putting in and taking out copy paper or a photograph and the difficulty of displacement were examined by the following method (in-house method).

The non-sealed corner of the holder of FIG. 1 is hung so that the plane of the holder is vertical and the lower edge 2 is inclined at 45 ° with respect to the horizontal plane. A photograph (service size; A glossy finish (about 88 × 126 mm) or a copy paper was inserted and dropped into the lower corner by its own weight to compare the ease of putting them in and out.

In the test, the photograph or copy paper inserted in the holder was pressed firmly with the palm (palm), and then the holder was hung in the opposite direction to the inserted state, and whether or not they would drop due to their own weight (misalignment movement) Sa), and evaluated probabilistically.

(7) The difficulty of bending the holder (strength of the waist) was examined as follows.

A sheet-shaped test piece cut into a strip with a width of 15 mm was horizontally projected from the desk, and the hanging state of the projected portion was examined.

The evaluations of the above-mentioned tests (4) to (7) are all four grades of very good (∘ mark), good (∘ mark), slightly bad (Δ mark) and bad (× mark). It was evaluated.

[0046]

[Table 1]

As is clear from the results shown in Table 1, the document holder of Comparative Example 1 was opaque because the pigment was compounded not only in the intermediate layer but also in the inner layer and the outer layer, and the haze was not measurable. The dispersibility of the pigment was poor.

In the document holder of Comparative Example 2, since the bending elastic modulus of the crystalline polypropylene of the inner layer did not satisfy the predetermined range, the inner surface had a sticky feeling and the taking in and out of the photograph was poor.

Further, since the document holder of Comparative Example 3 did not employ crystalline polypropylene in the inner layer, the stored copy paper was slippery and easily moved, and the waist was weak and easy to bend.

On the other hand, the document holders of Examples 1 to 3 which satisfy all the conditions can easily put in and take out documents including photographs and the like, and the stored documents and the like are not easily displaced, and the outer surface is The sheet-shaped document holder had a high gloss and did not have a sticky feeling on the inner surface, and was colored only in the intermediate layer and was colored in a semi-transparent light color.

[0051]

【effect】

 As described above, the transparent sheet-shaped document holder according to the present invention has a layer (A) made of a crystalline polypropylene polymer having a bending elastic modulus within a predetermined range due to the stereoregularity of the crystal structure, and is made of a crystalline material. Since it was formed on the transparent layer (B) made of polypropylene-based polymer, etc., and the layer (A) was made inward with the sheet material integrally laminated by the water cooling inflation method, it was sandwiched between two plastic sheets. It has the two contradictory characteristics that documents can be easily taken in and out, and that stored documents do not move easily, and it makes it possible to make documents that have a high-gloss outer surface look beautiful, and the document holder There is an advantage that there is no adhesion between the inner surfaces.

In the colored sheet-like document holder of the present invention, the coloring agent is mixed only in the intermediate layer (B) of the layers (A), (B) and (C) constituting the laminated sheet. Therefore, in addition to having all the advantages described above, it is a sheet-like document holder colored in a light-colored and semi-transparent manner, and can be economically manufactured by using a general-purpose coloring agent. There are advantages.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a sectional view of an essential part of the first embodiment.

FIG. 3 is a front view of the second embodiment.

[Explanation of symbols]

 1, 3 Folding edge 2, 4 Lower edge 5 Heat seal band 6 Punch hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshikazu Sugano Yoshikazu Sugano 202 Hamada Nitta, Daito-cho, Ogasa-gun, Shizuoka Karek Co., Ltd. (72) Yoshiji Furukawa 2-1-1 Takanomichi, Hirakata-shi Industrial stock company

Claims (2)

[Scope of utility model registration request] 1. A sheet-shaped document holder in which a plurality of rectangular synthetic resin sheets are superposed and at least two adjacent sides of these four sides are integrally fixed, wherein the sheets have a stereoregularity of a crystal structure. On the layer (A) made of a crystalline polypropylene polymer having a bending elastic modulus of 14000 to 20000 kgf / cm ² , the crystalline polypropylene polymer or propylene and another α
A layered sheet in which a layer (B) made of a copolymer with an olefin is superposed and integrated by a coextrusion water-cooled inflation method, and the layered sheets are superposed so that the layers (A) face each other. Sheet-shaped document holder to be. 2. A sheet-shaped document holder in which a plurality of rectangular synthetic resin sheets are superposed, and at least two adjacent sides of these four sides are integrally fixed, wherein the sheets have a stereoregularity of a crystal structure. Flexural modulus 140
Coloring is performed by mixing a colorant with the crystalline polypropylene-based polymer or a copolymer of propylene and another α-olefin on the layer (A) made of the crystalline polypropylene-based polymer having a weight of 0 to 20000 kgf / cm ^2. Layer (B) prepared above, and a transparent (C) layer composed of a crystalline polypropylene polymer or a copolymer of propylene and another α-olefin is overlaid on the layer (B), followed by coextrusion with water cooling. A sheet-like document holder comprising a laminated sheet integrated by an inflation method, and the laminated sheets are laminated so that the layers (A) face each other.