JPH072197Y2 - Plastic cardboard - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention is mainly used for packaging a cylindrical article, for example, a roll formed by winding a long and wide aluminum foil, a nylon film or the like.

[0002]

2. Description of the Related Art Since the above-mentioned wound material has a large weight, its surface is easily damaged during transportation, and it is an expensive material. Therefore, in order to prevent the damage as much as possible, conventionally, corrugated cardboard as thick as possible was used. The packaging is done. However, if too thick paper cardboard is used, it is difficult to bend and can not be wrapped, and if a lateral slit is added to increase the bendability,
Cracks occur during packaging and break easily, making it impractical.

Therefore, it is conceivable to use a thin but strong plastic corrugated cardboard. However, this plastic corrugated cardboard is generally hard and has a low bending property, and if it is simply slit, it will be cracked like a thick paper corrugated cardboard and used. Can not.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to increase the bendability of a high-strength plastic corrugated board so that an expensive and heavy article can be easily packaged.

[0005]

[Means for Solving the Problems] The means for solving the above problems in the present invention is a plastic corrugated board in which a large number of cores are provided in parallel between two liners, and the center of the liner from the surface of one liner The present invention is characterized in that a large number of corrugated slits extending in a direction intersecting with the center are provided over the entire surface toward the middle part of the above.

[0006]

When a plastic corrugated board is wound around a cylindrical object with the surface provided with the corrugated slits on the outside, the corrugated portion of the corrugated slits, which is nearly parallel to the transverse direction, is strongly bent. The core is cracked and wide open,
The larger the inclination with respect to the generatrix, the smaller the opening becomes, and the liner and the core between the slits also bend slightly depending on the opening width. In general, it bends in a state where many curved surfaces having different curvatures are connected. Also, even in the case of a crest with a large opening, the direction of the slit changes at both ends, so it is suppressed that the crest is greatly opened. Is prevented.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1-3, 1 is a plastic cardboard,
2 and 3 are front and back liners. Reference numeral 4 denotes a core that connects both liners 2 and 3, and the core 4 extends in a direction parallel to the length direction indicated by an arrow A and in a width direction indicated by an arrow B, as shown by a fractured surface in the upper right corner of FIG. They are evenly spaced. This plastic corrugated board 1 is conventionally used, and has a thickness of, for example, 5 to 10 mm, and has a considerably high rigidity.

According to the present invention, the plastic cardboard 1 is
It is an improved one, and the sine curve-shaped corrugated slits 5 extending in the width direction from the liner 2 on the front surface side of the plastic corrugated cardboard 1 to the middle of the core 4 are cut at an appropriate interval by cutting with a suitable tool. It is provided over.

As shown in FIG. 4, the plastic corrugated cardboard 1 is wrapped around the outer periphery of a cylindrical article W in which aluminum foil, nylon film or the like is wound, but the bending occurs during the winding. The wave crest portion 5 of the slit 5 oriented substantially in the same direction as the longitudinal direction of the surface of the article W, that is, the generatrix direction.
In a, the bending works to the maximum and widens as shown in FIG. 5, and in the inclined portion 5b having a large inclination with respect to the generatrix, the opening is slightly less. In the wide crest 5a, as shown in FIG. 6, the slit 5 can be torn near the liner 3 as shown as 5m to allow the corrugated board 1 to bend greatly, but in the inclined portion 5b, the slit depth can be increased. Does not change much. In this way, the tearing of the core 4 does not occur as a whole,
The liner 3 on the inner side does not become a continuous state, and there is no fear of breaking even if a large load is applied.

At the intermediate surface between the slits, the liners 2, 3 and the core 4 have a low degree of curvature and are bent in a substantially polygonal shape with the slit 5 as a ridge.
Since the intermediate surface 6a including the curved surface and the intermediate surface 6b including the inclined portion 5b have slightly different curvatures and different phases, the overall shape is a polyhedron whose height changes slightly. For this reason, the surface becomes slippery, there is no risk of slipping during handling, and there is an advantage that handling is easy.

Although the slit 5 has a sine curve shape in the above embodiment, it may be a trapezoidal wave-like slit like the slit 8 in FIG. 7 or a triangular wave-like slit like the slit 9 in FIG. In any case, the maximum opening or bending occurs in the wave front portion and the bending is large, but the opening is small in the other portions and the slit 8 or 9 is small.
Rarely grows deeper.

[0012]

As described above, according to the present invention, when the plastic corrugated cardboard is curved in the direction of the center, the corrugated portion of the slit is wide open and the other portions are small open. Even if it has a large strength, it is possible to easily wrap a cylindrical article with sufficient curvature, and since the breakage of the core due to the opening of the slit hardly grows except at the wave crest part, only one inner liner is used over the entire width. There is no possibility that the entire corrugated board will be broken. Therefore, there is an effect that a heavy article can be safely and easily packaged.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a top view of the same.

[FIG. 3] Same as above, vertical side view

[Fig. 4] Same as above, perspective view of use state

FIG. 5: Side view for explaining slits, same as above.

FIG. 6 is a plan view for explaining slits in the same as above.

FIG. 7 is an explanatory view of a slit of another embodiment.

FIG. 8 is an explanatory view of a slit of still another embodiment.

[Explanation of symbols]

1 Plastic corrugated board 2, 3 Liner 4 Core 5, 8, 9 Corrugated slit

Claims (1)

[Scope of utility model registration request] 1. A plastic corrugated board in which a large number of cores are provided in parallel between two liners, and a large number of corrugations extending from the surface of one liner to an intermediate portion of the cores in a direction intersecting with the cores. Plastic corrugated board with slits all over the surface.