JP3576569B2 - Composite sheet and binder formed from the sheet - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a composite sheet formed by laminating a plurality of sheets having different hardnesses, and a binder for closing and organizing documents, photographs, and the like formed using the sheets. In the present specification, a sheet is a concept including not only a sheet generally having a thickness called a sheet but also a sheet having a thickness called a film. , Loose leaf, etc., and is not limited at all.
[0002]
[Prior art]
Conventionally, this type of composite sheet includes, for example, a sheet formed by laminating a soft vinyl chloride layer on both inner and outer surfaces of a hard vinyl chloride layer. Of various stationery and other desired products (storage, packaging case, etc.).
[0003]
[Problems to be solved by the invention]
However, in a binder or the like formed by a conventional composite sheet, for example, printing on the outer cover of the book adheres to the outer surface of the binder main body when it is overlapped with a book or the like, or is bound on the inner surface. Characters and designs such as memos were easily in contact with and adhere to the inner surface of the binder body, and surface contamination was remarkable.
[0004]
The present invention has been made in view of such problems of the prior art, and has as its object to constitute a hard sheet and a soft sheet having excellent surface contamination prevention and ink film adhesion. An object of the present invention is to provide a composite sheet and a binder formed by the composite sheet and capable of being thermally processed by high frequency.
[0005]
[Means for Solving the Problems]
Technical means made by the present invention to achieve the above object are as follows:
On both inner and outer surfaces of the main body layer made of hard polypropylene
CH2 = CH2, CH2 = CCH3 COOCH3
Is provided with a surface layer comprising an ethylene-methyl methacrylate copolymer sheet obtained by copolymerizing
[0006]
Then, a binder is constituted by holding the composite sheet having the above structure.
[0007]
【Example】
Hereinafter, an embodiment of the present invention will be described.
[0008]
The composite sheet a of the present invention is composed of a main body layer 1 and a surface layer 2 superposed on both inner and outer surfaces 1a and 1b of the main body layer 1 (claim 1). A binder A having a known shape (claim 2) is formed.
[0009]
In addition, if the composite sheet a of the present invention is used, not only the binder A but also various stationery such as a file, a pencil case or a cutter mat, and other desired products such as a storage case, a packaging case, a book cover, In the case for a VTR, etc., those having the above-mentioned useful effects can be provided, and the products which can be provided are various and not limited at all.
[0010]
The main body layer 1 constituting the composite sheet a is formed by cooling and solidifying polypropylene continuously extruded and supplied into a sheet having a desired thickness into a hard sheet having a desired thickness.
[0011]
One surface layer 2 is
Embedded image
CH2 = CH2, CH2 = CCH3 COOCH3
Is a soft sheet excellent in surface contamination prevention and ink coating film adhesion formed in a sheet shape in the same manner as the main body layer 1 with an ethylene-methyl methacrylate copolymer obtained by copolymerizing the ethylene-methyl methacrylate copolymer.
[0012]
The main body layer 1 and the surface layer 2 may have any thickness and shape, and may be transparent, translucent or opaque.
[0013]
Therefore, specifically, the surface layer 2 is formed into a soft sheet having a desired thickness by a conventionally known extrusion process using ethylene methyl methacrylate, and the outer surface of the main layer 1 formed into a hard sheet having a desired thickness is formed from polypropylene. The surface layer 2 was overlaid on the surface 1b to form a composite sheet a, and a binder A having a desired shape was formed on the composite sheet a (see FIG. 1). The binder A can be stripped by heat sealing, high-frequency welding, or the like. An example of the strip-pressing condition in high-frequency welding is 200 v, 2 to 4 A, 15 to 25 sec, 2 mm wide bar.
[0014]
Although the main body layer 1 and the surface layer 2 have been described as being formed by extrusion, respectively, they may be formed by calendering. For example, when the surface layer 2 is formed by calendering, the above-described resin may be used. It is preferable to add an acrylic processing aid, an organic acid metal salt, an organic fatty acid alone or a mixture of two or more of these.
The acrylic processing aid, organic acid metal salt, organic fatty acid alone or a mixture of two or more thereof is added in an amount of 0.005 to 10 parts by weight, preferably 0.01 to 3 parts by weight, per 100 parts by weight of the resin. Parts by weight.
The appropriate temperature range for forming the above resin by calendering is 100 to 180 ° C, preferably 120 to 170 ° C.
[0015]
Then, the desired ink was spread on the surface layer 2, but the surface layer 2 provided good ink paste (coating adhesion). Although optional, a corona discharge treatment may be separately performed on the surface layer 2 in advance to adjust the wet surface tension.
Further, the binder A was placed on a desired book (not shown) or the like for a predetermined period of time, but the outer cover of the book did not adhere to the cover surface (outer surface) of the binder A. In addition, the surface layer 2 having the above-described configuration provides a surface anti-slip effect to prevent unexpected dropping, and the outer surface of the cover of the binder A is given a soft feeling and good feeling.
[0016]
In the above embodiment, the outer surface of the binder A is prevented from surface contamination and slip, and the inner surface of the cover is adhered to the inner surface of the cover by attaching characters such as memos and designs to the inner surface of the cover. 2, surface layers 2 and 2 are provided on both inner and outer surfaces 1a and 1b of the main body layer 1 so that the surface layer 2 is located on both inner and outer surfaces of the cover of the binder A as shown in FIG. The purpose is to prevent contamination of both inside and outside surfaces and to prevent surface slippage.
[0017]
【The invention's effect】
The present invention, as described above, on both the inner and outer surfaces of the sheet body layer made of hard polypropylene,
Embedded image
CH2 = CH2, CH2 = CCH3 COOCH3
Is provided with a surface layer made of a composite sheet characterized by having a surface layer made of an ethylene-methyl methacrylate copolymer sheet obtained by copolymerizing the above, while maintaining the shape retention by the polypropylene layer. In addition, the ethylene-methyl methacrylate copolymer layer, which is the inner and outer surface layers, imparts a soft feeling and is excellent in preventing surface contamination, and is excellent in printability and can be patterned by high frequency, thereby improving the commercial value.
[0018]
That is, a binder is molded with the composite sheet, and since the binder positions the ethylene-methyl methacrylate copolymer layer on both the inner and outer surfaces, a surface layer on the outer surface provides an anti-slip effect, Further, even if the book is overlapped with another book, the printing on the outer cover of the book does not adhere to the outer surface of the binder, so that surface contamination can be effectively prevented. Further, since the ethylene-methyl methacrylate copolymer is also positioned on the inner surface, even if letters, designs, and the like, such as bound memos, are in contact with the inner surface of the main body for a long time, they do not adhere to the inner surface, thereby preventing surface contamination. Further, by forming the surface layer with the above-configured ethylene-methyl methacrylate copolymer layer, the adhesion of the coating film is also improved.
[0019]
In addition, since the present invention has the above-described structure, high-frequency welding can be performed. For example, high-frequency welding can be performed even when characters or patterns are formed on the surface, or when a line is pressed when a broken line or the like is formed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing one embodiment of a binder.
FIG. 2 is an end view taken along the line xx of FIG. 1;
[Explanation of symbols]
a: Composite sheet A: Binder 1: Body layer 1a: Inner surface 1b: Outer surface 2: Surface layer

Claims (2)

On both inner and outer surfaces of the sheet body layer made of hard polypropylene
CH2 = CH2, CH2 = CCH3 COOCH3
And a surface layer comprising an ethylene-methyl methacrylate copolymer sheet obtained by copolymerizing the above. On both inner and outer surfaces of the main body layer made of hard polypropylene
CH2 = CH2, CH2 = CCH3 COOCH3
A binder formed by using a composite sheet provided with a surface layer formed of an ethylene-methyl methacrylate copolymer sheet obtained by copolymerizing the above.

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