JPH0445869Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention relates to ultra-thin and high-strength corrugated cardboard, which can be used not only for general purposes such as packaging boxes, but also for parts that conventionally used metal plates, etc. For example, it is used for the side plates of take-up reels.

[Conventional technology and problems]

Previously known corrugated boards were AF corrugated board with a thickness of 5 mm, BF corrugated board with a thickness of 3 mm, and EF corrugated board with a thickness of 2 mm.
It is broadly classified into cardboard.

Among these, EF corrugated board has problems in terms of strength.
It has been impossible to substitute metal plates or the like for certain parts. Also, since double-sided BF corrugated cardboard is simply glued together with a corrugated core paper sandwiched between the liners on both the front and back sides, if a through-hole is provided in it and a moving metal part is fitted into it, the hole in the through-hole will There was a problem in that the strength against the motion force applied to the wall was insufficient, and the edges of the hole were bent, resulting in loose fitting or tearing of the hole wall.

[Means for solving problems]

This project solves the above-mentioned problems. Therefore, the ultra-thin corrugated board of this invention is a double-sided corrugated board made by sandwiching and bonding corrugated core paper between liners on both the front and back sides, and corrugated core paper as the front liner on one side. The corrugated core paper side of the bonded single-sided corrugated cardboard was bonded and pressed to form five layers with a thickness of 2.6 mm or less.

[Effect]

In the proposed corrugated board, double-sided corrugated board and single-sided corrugated board are bonded and pressed together, so the corrugated core paper of the single-sided corrugated board is pressed, increasing the adhesion area to the liner of the double-sided corrugated board, making its strength extremely high, and applying pressure. Therefore, its thickness is also within the range of 2.6 mm or less.

The edges of the holes or cuts made in the cardboard are strong because the cardboard is made of five layers of liner and corrugated core paper.
Even if an external force is applied to this edge, it will not easily bend or tear.

〔Example〕

The present invention will be described below with reference to the embodiments shown in the drawings.

As shown in FIGS. 1 and 2, the corrugated board of the present invention has a corrugated core paper 3 sandwiched between liners 1 and 2 on both the front and back sides and a corrugated core paper 3 on one side of the double-sided corrugated board 4. The corrugated core paper 6 side of the single-sided corrugated board 7 to which the core paper 6 is adhered is adhered and pressurized so that the thickness thereof is 2.6 mm or less.

Figure 3 shows an example of the use of corrugated cardboard according to the present invention, in which the side plate 8 of the take-up reel is formed with this corrugated cardboard, and the required number of fitting holes 9 and 10 for the rotating parts are provided in the side plate 8 of the winding reel. Even if the side plate 8 is rotated by fitting the fitting holes 9 and 10 into the required parts of the metal rotating part, since the double-sided corrugated cardboard 4 and the single-sided corrugated cardboard 7 are bonded together and are configured in five layers, the above-mentioned The hole walls of each of the fitting holes 9 and 10 have sufficient strength to withstand the applied rotational force, and no breakage or tearing occurs at the edges of the holes.

〔effect〕

As mentioned above, according to this proposal, double-sided corrugated cardboard and single-sided corrugated cardboard are bonded and pressed, so the thickness is 2.6 mm.
In addition to obtaining thin corrugated board of less than mm, the corrugated core paper of single-sided corrugated board is adhered to the liner of double-sided corrugated board with a large adhesive surface, resulting in high overall strength.
This has the effect of producing a high-strength corrugated board that will not break or tear, especially at the edge portions of the cuts or through-holes.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a partially slanted view of corrugated cardboard, Fig. 2 is a sectional view showing double-sided corrugated cardboard and single-sided corrugated cardboard separated, and Fig. 3 is a diagram of the reel side plate of an example of use. FIG. 1, 2... Liner, 3... Corrugated core paper, 4...
Double-sided cardboard, 5... Liner, 6... Corrugated core paper, 7... Single-sided cardboard, 8... Reel side plate,
9, 10... Fitting hole.

Claims (1)

[Scope of utility model registration request] The corrugated core paper side of the single-sided corrugated board with the corrugated core paper bonded to the front liner is adhered to one side of the double-sided corrugated board with the corrugated core paper sandwiched between the liners on both the front and back sides, and pressure is applied. An ultra-thin corrugated board characterized by having a thickness of 5 mm or less and consisting of 5 layers.