JPH03240526A - Heavy weight sheet - Google Patents

Abstract

PURPOSE:To obtain a sheet useful in a weight, a soundproof material, an electromagnetic shielding material, or the like by filling iron sand into the core space of a double faced corrugated fiberboard. CONSTITUTION:The core space of a corrugated fiberboard 4 comprising two flat boards 1, 2 and a corrugated core 3 are filled with iron sand 5, and the end surfaces, where the corrugated end surfaces 6 of the core appear, are adhered with paper adhesive tapes 7, 8. Thus, a heavy weight sheet can be obtained which has appropriate flexibility, and is easy in handling, further, can be manufactured at a low cost, moreover, is ready in disposal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heavy sheet useful for weights, soundproofing, electromagnetic shielding materials, and the like.

[Conventional technology]

Conventionally, sheet-like weights have been made of heavy metals such as lead or iron, or the materials are inflexible and expensive, and exposed metal plates have been difficult to handle depending on the application. It was often difficult.

[Problem to be solved by the invention]

An object of the present invention is to provide a novel heavy-duty sheet that has appropriate flexibility, is easy to handle, can be manufactured at low cost, and is easy to dispose of.

Another object of the present invention is to provide a sheet material that is heavy and has an electromagnetic shielding effect, and can be used as a soundproofing material, an electromagnetic shielding material, and the like.

[Means to solve the problem]

The heavy-duty sheet successfully provided by the present invention is made by filling the core space of a double-sided corrugated pole with iron sand.

Note that the double-sided corrugated pole used in the heavy-duty sheet of the present invention is
This is a well-known sandwich structure in which flat base paper is pasted on both sides of a corrugated core of base paper. Also includes. As the double-sided corrugated pole (hereinafter referred to as corrugated pole), a commercially available one for manufacturing corrugated pole boxes can be used, and no special one is required.

Further, the iron sand to be filled in the core of the heavy weight sheet of the present invention is magnetite produced in Australia etc.
It is possible to easily obtain a highly fluid powder containing e30 as the main component, in which more than 99% of the powder is approximately spherical with a diameter of about 0.5 mm or less.

Next, a typical manufacturing method of the heavy weight sheet of the present invention will be explained.

Cut the corrugated poles in advance to the size of the heavy sheet you are trying to make. Further, one end of the tunnel-shaped space formed by the core is closed by pasting paper to one of the end faces of the corrugated pole where the corrugated end face of the core is exposed. When a large number of similarly processed corrugated poles are placed in close contact with each other with their closed ends facing down, the core spaces of all the corrugated poles open upward, and iron sand is poured into them. After filling the iron sand with as few gaps as possible by applying vibration, etc., seal the opening end surface used for filling with paper to prevent the iron sand from flowing out.

The end face of the corrugated cardboard may be treated to prevent iron sand from flowing out, and the treatment means is not limited. That is, any material other than paper can be used to seal the end face, and
It may be sealed by deforming the corrugated pole near the end face.

[Effect]

Iron sand has a bulk specific gravity of about 4.6 and is heavy enough to be used as a weight, but since it is a powder with good fluidity, it cannot be used as a weight as it is. The corrugated pole of the present invention allows this iron sand to be evenly spread two-dimensionally as a powder and stably held, allowing it to be used as a weight sheet.

〔Example〕

In the illustrated embodiment, iron sand 5 is filled in the core space of a corrugated pole 4 consisting of two sheets of flat base paper 1, 2 and a corrugated core 3, and the end face (first In the figure, the upper and lower end surfaces) are pasted with paper adhesive tape 7.8 (a part of the paper adhesive tape 8 is removed so that the inside of the cardboard 4 can be seen, but in reality it is completely sealed with paper adhesive tape). This prevents the iron sand 5 from flowing out.

With this structure, when corrugated poles with a thickness of 5 mm and a weight of 800 g/m2 are used, 11.850 kg of iron sand can be filled per m2 of corrugated board without using any special filling means, and the overall bulk specific gravity is reduced. A sheet weighing 2.53 was obtained.

〔Effect of the invention〕

As mentioned above, the heavy-duty sheet of the present invention is made by filling the core space of corrugated poles with iron sand, which has a high specific gravity and good fluidity.3 Therefore, it looks exactly the same as corrugated cardboard and has flexibility. Although it is easy to handle, it is a heavy board with a bulk specific gravity of approximately 2.5 or more, making it heavier than general concrete products.

Therefore, it is suitable as a weight that is required to be sheet-like. Furthermore, it can also be used as a soundproofing material by taking advantage of the above-mentioned characteristics.

Furthermore, by utilizing the electromagnetic shielding effect of iron sand, it can be used as an electromagnetic shielding material, making it extremely useful.

The heavy weight sheet of the present invention is advantageous in that it can be easily manufactured from inexpensive materials and is extremely inexpensive, and since it is made of paper and iron sand, it can be easily disposed of after use.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a heavy sheet of the present invention, and FIG. 2 is an enlarged plan view of section A in FIG.

Claims (1)

[Claims] A heavy sheet made by filling the core space of double-sided corrugated cardboard with iron sand.