JP2000087489A - Floor steel sheet excellent in workability and drain property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a function by providing many protrusions of a truncated conical shape or a truncated pyramidal shape having a specific size, a specific area ratio and specific surface roughness on the surface of a stainless steel sheet. SOLUTION: Many protrusions 2 of a truncated conical shape or a truncated pyramidal shape are nearly uniformly dispersed and arranged on the surface of a steel sheet 1 to form a floor steel sheet used for a floor of a factory or a kitchen or a staircase. The height of the protrusions 2 is set to 0.2-1.2 mm to reduce fatigue and to prevent a slip at the time of walking. The tilt angle against the bottom faces of the protrusions 2 is made 60 deg. or below, the residual ratio of stains such as tallow stuck to the floor surface is reduced to facilitate cleaning. The ratio of the total area of the bottom faces of all protrusions 2 against the surface area of the steel sheet 1 is set to 30% or below to reduce the residual ratio of stains, and it is set to 10% or above to improve a slip preventing property. The surface roughness of the truncated section surfaces of the protrusions 2 is set to 5-100 μm to improve the slip preventing property. Fatigue can be reduced, and workability and a cleaning property can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to floors of factories and kitchens,
The present invention also relates to a steel plate for floors having a slip prevention function used for stairs and the like.

[0002]

2. Description of the Related Art As a steel sheet for floors used in factories, kitchens or stairs, there is a stainless steel striped steel sheet having a so-called checker pattern unevenness, which is manufactured by cutting after hot rolling, annealing and pickling. A stainless steel strip steel plate provided with a circular convex portion by cold rolling or cold press forming is known. However, the use of the floor steel sheet is not limited to floor material, but is also used as a flat material such as a gutter cover, a water storage tank, and a storage tank.

[0003] Generally, a steel plate of this type, for example, a stainless steel strip steel plate, has a main purpose of preventing slip on its surface.
In general, a large number of convex portions having various shapes are dispersedly arranged.

[0004]

In this respect, the known stainless steel strip has a sufficient function of preventing slippage, but there are some problems to be solved in the use thereof. . First, when used as a gutter cover in a meat factory, a confectionery factory, or a general passage, the degree of fatigue when a worker or a general pedestrian walks on it is higher than that of a flat plate. There are things. With these problems, the working efficiency decreases, the production volume decreases, and the product defect rate increases.

Second, when such a known stainless steel strip steel sheet is used for a floor of a rolling mill such as a meat factory, a chemical factory floor, or a steel mill, high-pressure water, chemicals, or the like can be used to remove floor contaminants. Or you need to use a vacuum cleaner,
These operations require a great deal of labor.

Third, when used on floors of meat factories, confectionery factories, pharmaceutical factories, etc., raw materials, intermediate products or products are vibrated when transported by a transport vehicle. The conveyed material jumps out, and as a result,
Defective products may occur.

Accordingly, an object of the present invention is to provide a floor steel sheet which is excellent in workability and drainage property and solves the above-mentioned problems of the prior art.

[0008]

According to the present invention, there is provided a steel sheet having a plurality of projections dispersed on a surface thereof, the projections being inclined with respect to the bottom surface. Angle less than 60 ° and height from the bottom 0.2-1.2
The present invention proposes a steel sheet having an inclined surface of mm and a ratio of the total area of the bottom surfaces of all the protrusions to the surface area of the steel sheet being 10 to 30%.

However, in the above steel sheet for floor, the shape of the convex portion is a truncated cone or a truncated pyramid, and the surface roughness of the flat surface of the truncated convex portion is in the range of 5 to 100 μm. It is a preferred embodiment that the steel plate is made of stainless steel. The present invention is suitably used as a steel sheet for floors of sanitary workplaces in confectionery factories, meat factories, food factories, kitchens, markets, and the like.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The steel sheet for floors of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the steel sheet for floor of the present invention is characterized in that a large number of projections 2 are almost uniformly distributed on the surface of a steel sheet 1, and the shape and arrangement of the projections 2 are devised. is there. That is, as illustrated in FIG. 2, the convex portion 2 has a truncated conical shape, the inclination angle α with respect to the bottom surface 21, that is, the plate surface, is equal to or less than 60 °, and the height h from the bottom surface 21 is 0. It is essential to have a sloped side surface 22 of 2 to 1.2 mm.

Here, the smaller the height h of the convex portion 2 is, the smaller the degree of fatigue tends to be. According to a study by the inventors, when the height h is 1.2 mm or less, the degree of fatigue is reduced. It was confirmed that reduction could be achieved. That is, regarding the relationship between the height h of the convex portion 2 and the degree of fatigue, a convex portion which operates at a speed of 5 km / h was provided for each of a group of 30 non-smokers and non-drinkers in the late 20s of boys or girls. We continued walking on a metal belt conveyor and investigated the time until walking became difficult. The result is shown in FIG. As can be seen from this figure, when the height h of the projection 2 is 1.6 mm, the speed is 5 km / h.
It was difficult to maintain the continuous walking for 30 minutes or more in the late 20s of men and 30 minutes or more in the late 20s of women. On the other hand, when the height h of the convex portion 2 was 1.2 mm or less, continuous walking for 35 minutes or more was possible, and no difference in the degree of fatigue due to gender was observed. That is, the convex portion 2
Is required to be 1.2 mm or less. On the other hand, the lower limit of the height h of the projection 2 is limited to 0.2 mm to prevent slippage during walking. A preferred lower limit is 0.5 mm
It is.

Next, the side surface inclination angle α of the convex portion 2 will be described. In general, the cleaning effect when the floor was contaminated, that is, drainage, was evaluated based on the percentage of tallow remaining after washing the tallow evenly applied to the floor with warm water. The result is shown in FIG. As shown in the figure, when the inclination angle α is 60 ° or less, the tallow residue rate is 5 regardless of the area ratio described below.
%, Which indicates that a sufficient cleaning effect can be obtained. In particular, when the inclination angle α becomes 50 ° or less, the tallow residue ratio becomes less than 0.3%, which is more effective.

In the present invention, when the projections 2 are provided on the surface of the steel sheet 1, the total area ratio of the bottom surfaces 21 of all the projections 2 to the surface area of the steel sheet 1 (hereinafter referred to as "area ratio")
Needs to be 10 to 30%. Preferably, it is 10 to 20%.

FIG. 5 shows the relationship between the above-mentioned residual ratio of tallow and the area ratio of the convex portion 2. As shown in FIG. 5, when the area ratio of the convex portion 2 becomes 30% or less, Tallow residue is reduced to 20% or less, and a good cleaning effect is obtained. In particular, when the area ratio of the convex portion 2 is 30% or less and the inclination angle is 50 °, the tallow residue ratio is reduced to 30% or less. In addition, the area ratio of the convex portion 2 is shown in FIG.
As exemplified in (a) and (b), values calculated based on actually measured values were adopted.

On the other hand, FIG. 7 shows the relationship between the area ratio of the convex portion and the coefficient of friction which is an index of the slip prevention effect.
As shown in this figure, in order to obtain an excellent anti-slip effect in comparison with a flat plate with a friction coefficient equivalent to that of an existing striped steel plate, it is understood that this area ratio should be 10% or more.

Although the projection shown in FIGS. 1 and 2 is a truncated cone, the projection may be formed by a truncated pyramid, typically a truncated pyramid shown in FIG. Also in this case, it is needless to say that the same effect as in the case of the above-mentioned truncated cone can be obtained. Further, it is preferable to set the surface roughness of the flat surface of the truncated cone to 5 to 100 μm in the convex portion formed by the truncated cone or the truncated pyramid to prevent slippage during walking. Incidentally, it is recommended that stainless steel be used for the steel sheet in terms of maintaining corrosion resistance without painting, maintenance of cleanliness, and maintenance of wear resistance due to aging with walking and running.

[0017]

EXAMPLES Examples 1 to 5 and Comparative Examples 1 and 2 shown below are shown.
For the floor steel sheet, the above-mentioned running maintenance time, tallow residue rate and friction coefficient were examined. Table 1 shows the results. As shown in Table 1, it can be seen that the steel sheet according to the present invention has a lower degree of fatigue, better cleanability, and anti-slip properties equal to or higher than those of the conventional steel sheet.

EXAMPLE 1 A SUS304 steel plate (4 mm thick) formed by hot rolling was provided with a cone (8 mm in height h: 0.3 mm and an inclination angle α: 45 °).
A product having a convex portion composed of (φ) at an area ratio of 13.9%. Example 2 A hot-rolled SUS304 steel plate (3.5 mm thick)
Conical with height h: 0.2 mm and inclination angle α: 45 ° (8
mmφ) with an area ratio of 13.9%. Example 3 A SUS304 steel plate (thickness 3 mm) formed by hot rolling was provided with a cone (8 mm in height: 0.4 mm and an inclination angle α: 30 °).
A product having a convex portion composed of (φ) at an area ratio of 13.9%. Example 4 A cold-rolled SUS304 steel plate (1 mm thick) was provided with a cone (8 mm in height h: 0.3 mm and an inclination angle α: 30 °).
A product having a convex portion composed of (φ) at an area ratio of 13.9%. Example 5 Cold rolled SUS304 steel plate (1.5 mm thick)
Square pyramid with height h: 0.4 mm and inclination angle α: 30 °
(Bottom 20mm) The product which has the convex part of 30% in area ratio.

Comparative Example 1 A commercially available striped steel sheet having a projection shown in FIG. 9 (a) on a steel sheet having a thickness of 3 mm. Comparative Example 2 A commercially available anti-slip steel sheet having a 1.5 mm-thick steel sheet and having projections shown in FIG. 9 (b).

[0020]

[Table 1]

[0021]

As described above, according to the present invention, it is possible to provide a steel sheet for floors which has low fatigue, good workability, and excellent cleanability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a steel sheet for floors of the present invention.

FIG. 2 is a side view of a projection.

FIG. 3 is a diagram showing a relationship between the height of a convex portion and the degree of fatigue.

FIG. 4 is a diagram showing a relationship between an inclination angle of a convex portion and a tallow residue ratio.

FIG. 5 is a diagram showing a relationship between an area ratio of a convex portion and a tallow residue ratio.

FIG. 6 is a diagram illustrating a method of obtaining an area ratio.

FIG. 7 is a diagram showing a relationship between an area ratio of a convex portion and a friction coefficient.

FIG. 8 is a perspective view showing another example of the convex portion.

FIG. 9 is a view showing a conventional convex portion.

[Description of Signs] 1 steel plate 2 convex portion 21 bottom surface 22 side surface

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hirokazu Uchiki 4-2 Kojimacho, Kawasaki-ku, Kawasaki-ku, Kawasaki, Kanagawa Prefecture F-term (reference) 2F162 CB02 CB07

Claims (4)

[Claims] 1. A steel plate having a large number of projections dispersed on a surface thereof, wherein the projections have an inclination angle of 60 with respect to the bottom surface.
° or less, the height from the bottom surface is 0.2 to 1.2 mm, and the ratio of the total area of the bottom surface of all the projections to the surface area of the steel sheet is 10 to 30%. And floor steel sheet. 2. The steel sheet for floor according to claim 1, wherein the shape of the convex portion is a truncated cone or a truncated polygonal pyramid. 3. The steel sheet for floor according to claim 1, wherein the flat surface of the truncated projection has a surface roughness of 5 to 100 μm. 4. The floor steel sheet according to claim 1, 2 or 3, wherein the steel sheet is made of stainless steel.