JPH088857Y2 - Twin-ring type binder coated wire - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a coated wire which is a wire material for a binder used in a notebook, a calendar or the like, and is particularly preferably used for a twin ring type.

[Conventional technology]

Conventionally, there have been binders of spiral type and twin ring type.

Spiral binder is made by bending a wire into a spiral shape, and the binder is used by inserting the spiral wire into a spiral wire with a number of holes arranged side by side at regular intervals. To do. The wire of this system is relatively mild as a processing condition because it is only bent in a spiral shape with a constant curvature, and a special covered wire is not required.

On the other hand, the twin-ring type binder is a curved arm formed by two loops adjacent to each other by subjecting one wire to a meandering bending process and a cylindrical bending process as shown in FIG. The parts 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i, which are adjacent to each other (for example, 2a and 2b), have their tips arranged next to each other. A large number of holes 8 arranged in parallel at regular intervals at the end of 10
Every other arm portion 2g, 2i is inserted into the .... In such a twin ring type binder, the two loops forming each of the arm portions 2a, 2b, 2c ... Are provided with one or two bent portions at the tips of the respective arm portions 2a, 2b, 2c. It is in a relationship folded back through. Therefore, the bending condition is more severe than that of the spiral type, and in particular, as shown in the drawing, every other arm portion 2a, 2c, 2e, 2g ... Is replaced with another arm portion 2b, 2d, 2f. Bending conditions are extremely severe when a bent portion that is bent 180 degrees like a hairpin is formed at the tips of the narrower arm portions 2a, 2c, 2e, 2g ...

As a twin-ring type coated wire for binder subjected to such a severe bending process, conventionally, a steel wire has been used in which an abrasion resistant thermoplastic resin such as nylon or hard polyvinyl chloride is extrusion-adhesively coated. .

[Problems to be solved by the device]

When the steel wire coated with the above wear resistant thermoplastic resin was used as the coated wire for the twin-ring type binder, scratches and cracks in the coating layer due to severe bending were reduced, but the following problems still remained. There was a point. That is, when the nylon resin is directly adhered to the steel wire, a decrease in adhesion due to water absorption of the resin and a crack on the resin surface due to the influence of a coloring agent such as titanium oxide are serious problems.

Such quality problems are often solved by increasing the thickness of the coating layer in other applications, but the wire used for the twin ring binder of the present invention requires an extremely thin wire. However, the thickness of the coating layer cannot be increased. In other words, if the overall diameter of the wire is too large, it is necessary to have a large hole size at the end of the leaf, which is also unattractive. Conversely, if the overall diameter of the wire is reduced, the strength, rigidity, etc. of the wire will be weakened,
There is a problem that the function as a binder is deteriorated. Therefore, as the wire material for the binder, the steel wire needs to have a predetermined thickness and the coating thickness needs to be thin.

Moreover, even if severely bent, the coated surface is not easily scratched, and even if water is absorbed, the adhesion does not decrease, and a material having good crack resistance has been desired.

[Means for solving the problem]

The present invention has been made in view of the above problems, and the twin-ring type binder coated wire of the present invention has a metal-adhesive polyolefin resin coating layer provided on the outer periphery of a steel wire and a nylon resin layer provided on the outer periphery thereof. It is a feature.

[Action]

The coated wire of the present invention having the above-mentioned structure has a nylon resin layer on the surface layer, and therefore is resistant to scratches and has good wear resistance, and is desirable for a twin-ring type binder. In addition, the nylon resin absorbs water, but since there is a polyolefin resin coating layer under the resin, moisture does not penetrate to the metal surface, and the metal surface oxidizes and the coating resin swells or peels off. There is no. Therefore, even if tensile force or shrinkage force is partially applied to the resin layer due to severe bending, the nylon resin of the outer layer and the polyolefin resin of the inner layer are in a close contact state, and the polyolefin resin coating layer of the inner layer is made of metal. Since it has adhesiveness, it does not cause wrinkles, swelling, peeling, cracks or the like on the coating surface.

〔Example〕

 An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an enlarged sectional view showing a covered wire 1 according to an embodiment of the present invention, and 2 is a steel wire. Steel wire 2 has a diameter of about 0.
5 to 1.0 mm with a tensile strength of 60 to 90 kgf / mm ² is used. The surface of the steel wire 2 is subjected to rustproofing treatment such as zinc plating. Reference numeral 3 is a metal-adhesive polyolefin resin coating layer, for example, Himilan 1705 (trade name, manufactured by DuPont Mitsui Polychemical Co., Ltd.) is preferably used. The thickness of the layer is 3 to
The thickness is 20 μm, preferably 10 μm or less. If the thickness is less than 3 μm, it becomes difficult to uniformly coat the surface of the steel wire, and if it is more than 20 μm, the total thickness becomes too thick, which is not preferable.

Reference numeral 4 denotes a nylon resin layer, and “Nylon 6” or “Nylon 6-10”, which is a typical polyamide-based synthetic resin, is preferably used. The thickness of the nylon layer 4 is not particularly limited, but it is 10 to 30 μm, preferably about 15 to 25 μm in view of the fact that the total thickness cannot be increased and the role as a protective layer.
m is sufficient. The above steel wire 2 coating is obtained by extrusion adhesion coating using a crosshead die. Further, when a large amount of pigment such as titanium oxide is added to the nylon resin layer 4, resin deterioration easily occurs. In particular, cracks are likely to occur due to stress strain of the resin in the portion where severe bending is applied. In the present invention, since the metal-adhesive polyolefin resin coating layer 3 is provided as the lower layer, the resin coating layer has two layers, so that even if the amount of titanium oxide is reduced, the resin layer can be sufficiently aesthetically pleasing, glossy and glossy. Therefore, the occurrence of cracks can be reduced.

FIG. 2 is a perspective view of the twin ring type binder as described above. 1 shows a state in which a binder is partially inserted in the leaf 10.

As is clear from the figure, the covered wire 1 is formed by two loops, but the narrow arms 2a, 2c, 2e, 2g,
In order to reduce the radius of curvature of the tip of 2i ..., the outer surface of the nylon resin layer 4 of the wire 1 that has been bent is extremely extended and the inner surface thereof is extremely compressed, but the nylon resin layer 4 is an inner layer. It does not come off because it is in close contact with the polyolefin resin coating layer 3. Even if it is peeled off, since the surface of the steel wire 2 is provided with the metal-bonded polyolefin resin coating layer 3, the steel wire 2 is not rusted and the coating layer is not peeled off.

[Effect of device]

As is clear from the above description, the coated wire according to the present invention is suitable for the twin-ring type binder, and does not crack or crack on the surface despite the severe bending conditions, There is an effect that swelling or peeling is unlikely to occur between the wire and the coating layer. Since the resin layer consists of two layers, it is possible to reduce the adverse effect of the pigment such as titanium oxide on the nylon resin, because the pigment of the nylon resin layer can provide a coated wire with a beautiful appearance and gloss even if the concentration is reduced. It has the effect that

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of the coated wire of the present invention, and FIG. 2 is a perspective view of a twin ring type binder. 1 ... Coated wire, 2 ... Steel wire, 3 ... Polyolefin resin coating layer, 4 ... Nylon resin layer.

Claims (1)

[Scope of utility model registration request] 1. A coated wire for a twin-ring type binder, comprising a metal adhesive polyolefin resin coating layer provided on the outer periphery of a steel wire, and a nylon resin layer provided on the outer layer thereof.