KR20230154037A - Shoe soles and their manufacturing method - Google Patents

Abstract

We provide shoe soles that can demonstrate excellent resistance to moisture even when the walking surface is slippery, such as when there is liquid on the walking surface.
It is provided with a base portion 10 disposed on the bottom of the shoe and a plurality of anti-slip protrusions 20 having a V-shaped cross section installed downward from the lower surface of the base portion 10, and these base portions 10 and In a shoe sole in which the anti-slip protrusion 20 is formed integrally with an elastomer, at the connection portion of the anti-slip protrusion 20 with the base portion 10, a pedestal portion whose cross-section increases as it approaches the base portion 10 ( 24) is provided, and the surface roughness (Ra) of the bottom surface of the anti-slip protrusion 20 is 1.5 μm or less.

Description

Shoe soles and their manufacturing method

The present invention relates to a shoe sole that can exhibit excellent resistance to activity even when walking on a slippery walking surface and a method of manufacturing the same.

As shown in FIG. 1A, the shoe sole has a structure in which a plurality of anti-slip protrusions 20 are provided on the lower surface of the base portion 10. This type of shoe sole is manufactured by molding elastomer into a mold.

The shape of the anti-slip protrusion 20 varies depending on the type or manufacturer of the shoe, but the edge 23 of the boundary between the lower surface 21 (ground surface) and the side surface 22 of the anti-slip protrusion 20 is the walking surface. In addition to strongly contacting (50) and being caught, it is common to prevent the shoe from slipping against the walking surface (50) due to friction of the lower surface (21) (contact surface).

However, in the conventional shoe sole, the anti-slip protrusion 20 falls over due to the load (weight of the pedestrian) during walking, as shown in Figure 1 (b), so the lower surface 21 of the anti-slip protrusion 20 is a walking surface ( 50), there was concern that it would barely reach the level. For this reason, there are cases where the resistance of the shoe sole is not sufficiently demonstrated.

In light of this reality, the present applicant formed the grounding protrusion 3 (anti-slip protrusion) in a V-shaped cross section as shown in FIG. 1 of Patent Document 1, and at the same time, as shown in FIG. 2 of the same document, the base portion A shoe sole is proposed in which an inclined reinforcement part (5) (pedestal part) is installed at the border between (2) (base part) and each grounding protrusion (3) (anti-slip protrusion).

By making the grounding protrusion 3 (anti-slip protrusion) V-shaped in cross section, the bending moment of the grounding protrusion 3 can be increased.

Additionally, by installing the inclined reinforcement portion 5 (pedestal portion), it becomes difficult to deform the base portion of the grounding protrusion 3 (anti-slip protrusion).

For this reason, it is possible to prevent the grounding protrusion 3 (anti-slip protrusion) from falling over in any direction (e.g., forward-backward or left-right direction).

The related patent document is International Publication No. 2006-003740.

The shoe sole of the patent document states that the grounding protrusion 3 (anti-slip protrusion) is difficult to fall over and can exhibit good resistance to friction with a coefficient of dynamic friction against a smooth floor surface of about 0.5.

However, the shoe soles in the patent document have room for improvement in terms of resistance when the walking surface is slippery, such as when liquid such as water is present on the walking surface.

The present invention was made to solve the above problems, and is to provide a shoe sole that can exhibit excellent resistance to moisture even when the walking surface is slippery, such as when liquid is present on the walking surface. Additionally, it is an object of the present invention to provide a method for manufacturing this shoe sole.

The above object is provided with a base portion disposed on the bottom of a shoe and a plurality of anti-slip protrusions forming a V-shaped cross section provided downward from the lower surface of the base portion, and these base portions and the anti-slip protrusions are integrally formed with an elastomer. As a shoe sole, a pedestal portion whose cross-section increases as it approaches the base is provided at the connection portion of the non-slip protrusion with the base portion, and the surface roughness (Ra) of the lower surface of the anti-slip protrusion is 1.5 ㎛ or less. It provides the sole.

Here, the “transverse section (of the anti-slip protrusion)” refers to the lower surface 21 of the anti-slip protrusion 20 as shown in the cross section ( _α1 ) in Fig. 2 (a) ( Fig. 2 (b) Refers to the cross section when cut in a plane (horizontal plane) parallel to the plane (see ).

“V-shaped cross section” means that the cross section (α ₁ ) continues along the V-shaped line (L).

On the other hand, as shown in the cross section ( _α2 ) in Figure 2(b), the cross section of the non-slip protrusion cut along a plane perpendicular to the V-shaped line (L) is sometimes called the “longitudinal cross section (of the anti-slip protrusion).” .

In order to increase the durability of the shoe sole, it is important that a wide area of the bottom of the anti-slip protrusion is in close contact with the walking surface. Therefore, the surface roughness (Ra) of the bottom of the anti-slip protrusion is set to 1.5㎛ or less to prevent slipping on the walking surface. A wide contact area can be secured on the bottom of the protrusion.

In addition, even if there is liquid on the lower side of the non-slip protrusion (between the lower surface of the anti-slip protrusion and the walking surface), when the lower surface of the anti-slip protrusion touches the walking surface, the liquid on the lower side of the non-slip protrusion becomes the non-slip protrusion. It is also possible to easily push it around.

In addition, when the lower surface of the non-slip protrusion touches the walking surface, the air on the lower side of the non-slip protrusion can easily be pushed out around the non-slip protrusion.

For this reason, a weak vacuum state may be generated at the boundary between the lower surface of the anti-slip protrusion and the walking surface so that the lower surface of the anti-slip protrusion is stuck to the walking surface. Therefore, the resistance of the shoe sole can be increased even when the walking surface is slippery, such as when there is liquid such as water on the walking surface.

In the shoe sole of the present invention, the edge formed by the lower surface and the side surface of the anti-slip protrusion (see “edge 23” in FIG. 2(b). Hereinafter, this edge is simply referred to as the “edge of the anti-slip protrusion”. It is desirable to set the radius (R) (see Figure 2(b)) to 0.5 mm or less.

As a result, the edges of the anti-slip protrusions become sharp and become prone to getting caught on the walking surface. In addition, when walking on a walking surface containing liquid such as water, it may be difficult for the liquid around the non-slip protrusion to enter the lower side of the non-slip protrusion after the anti-slip protrusion is grounded on the walking surface. Therefore, the resistance of shoe soles can be further increased.

In the shoe sole of the present invention, the ratio (H/W) of the width (W) of the longitudinal section (α ₂ ) of the non-slip protrusion (see FIG. 2(b)) and the height (H) of the portion of the non-slip protrusion excluding the pedestal portion. It is desirable to set it in the range of 0.1 to 1.

This means that if the ratio (H/W) is set to less than 0.1, there is a risk that the edges of the anti-slip protrusions may have difficulty getting caught on the walking surface, and if the ratio (H/W) is set to be larger than 1, the load (pedestrian's weight) may cause damage while walking. This is because the non-slip protrusions tend to fall over, making it difficult for the lower surface of the non-slip protrusions to adhere to the walking surface.

By adopting the above-mentioned structure in the shoe sole of the present invention, it is possible to suppress the residual liquid surface density of each non-slip protrusion to 5 mg/cm2 or less.

Here, the “residual liquid surface density of the anti-slip protrusions” is an indicator of how much liquid remains on the bottom of the anti-slip protrusions after being pushed against the surface where the liquid exists (a surface that can be called a walking surface).

The smaller the density of this residual liquid surface, the better the drainage properties of the non-slip protrusions, and the greater the density of this residual liquid surface, the worse the drainage properties of the non-slip protrusions. The density of the residual liquid surface of the anti-slip protrusion is measured in the following manner.

Figures 3 and 4 are diagrams explaining a method of measuring the density of the residual liquid surface of the anti-slip protrusion.

[1] First, as shown in FIG. 2 (a), the test solution 70 is dropped on the substrate 60. The substrate 60 uses a smooth resin film 62 attached to the upper surface of an aluminum plate 61.

The resin film 62 is fixed to the aluminum plate 61 with an adhesive tape 63 or the like to prevent the resin film 62 from moving relative to the aluminum plate 61.

When the anti-slip protrusion 20 is removed from the substrate 60 in [6] below, the resin film 62 is applied to the test solution 70 (the lower side of the anti-slip protrusion 20) on the lower side of the anti-slip protrusion 20. This is to ensure that the test solution (70) cured in follows toward the anti-slip protrusion 20 (so that the test solution (70) does not remain on the substrate 60 side).

The test solution 70 is a liquid latex (a water-soluble adhesive SV-160L manufactured by Regtex Co., Ltd., with a thickener added to adjust the viscosity to 3.5 Pas).

The test solution 70 is thinly stretched so as to be wider than the area of each non-slip protrusion 20 (the lower surface (ground surface) of FIG. 3(b)) on which measurement is performed.

In the example of FIG. 3, the test solution 70 is dropped at five locations on the upper surface of the substrate 60 so that the residual liquid surface density of five anti-slip protrusions 20 can be measured at a time.

[2] Next, as shown in FIGS. 3(b) and 3(c), the anti-slip protrusion 20 is applied to the test solution 70 with the lower surface (ground surface) of the anti-slip protrusion 20 facing downward. Place it slightly on top.

The anti-slip protrusion 20 is used separately from the base portion 10 (see Figure 1).

When the anti-slip protrusion 20 is placed on the test solution 70, the upper surface of the anti-slip protrusion 20 is flattened so that the upper surface of the anti-slip protrusion 20 (cut surface with the base part 10) is horizontal. put it

Five anti-slip protrusions (20) of the same shape are prepared (adjusted so that their weights are the same). The weight (W0) of each anti-slip protrusion (20) is measured in advance.

[3] Next, as shown in FIGS. 3(d) and 4(e), a weight 80 is placed on the upper surface of the anti-slip protrusion 20.

The weight 80 uses a plate-shaped body (weight 6g) that completely covers the upper surface of the anti-slip protrusion 20.

The weight 80 (plate-shaped body) is placed horizontally and balanced so that the weight of the weight 80 is evenly applied to the upper surface of the anti-slip protrusion 20.

Accordingly, the anti-slip protrusion 20 sinks with respect to the test solution 70, and the test solution 70 on the lower side of the anti-slip protrusion 20 (between the lower surface of the anti-slip protrusion and the upper surface of the substrate 60) slides. It is pushed around the prevention protrusion (20).

[4] Afterwards, the weight 80 is kept placed until the test solution 70 hardens. In order to shorten the curing time of the test solution 70, the anti-slip protrusion 20 may be placed in a gear oven together with the substrate 60 and dried by heating.

[5] When it is confirmed that the test solution 70 has hardened, remove the weight 80 from the upper part of the anti-slip protrusion 20 and remove the anti-slip protrusion (20) using tweezers 90, etc. as shown in FIG. 4(f). 20) Cleanly remove the surrounding test solution (70) (the test solution (70) that has been hardened in a pierced state around the anti-slip protrusion (20)).

At this time, be careful not to allow the hardened test solution 70, which remains on the lower side of the anti-slip protrusion 20, to be drawn out to the surroundings.

If the test solution 70 after hardening is lightly cut with a cutter knife, etc., it becomes easy to remove only the test solution 70 around the non-slip protrusion 20.

[6] Next, as shown in FIG. 4(g), the anti-slip protrusion 20 is removed from the upper side of the substrate 60.

The cured test solution 70, which remains on the lower side of the anti-slip protrusion 20 without being pushed out from the lower side of the anti-slip protrusion 20, is peeled off from the substrate 60 while sticking to the side of the anti-slip protrusion 20. Lose.

[7] Measure the weight (W1) of the anti-slip protrusion 20 (the anti-slip protrusion 20 with the cured test solution 70 attached to its lower side) removed from the substrate 60 in [6] above. .

[8] For each anti-slip protrusion 20, calculate the difference (Ｗ１－Ｗ０) between the weight (W1) measured in [7] above and the weight ( _W0 ) measured in [ ₂ ] above.

[9] Divide the difference ( _Ｗ１ － _Ｗ０ ) obtained in [8] above by the area (S) of the lower surface (ground surface) of each anti-slip protrusion 20 to obtain the value (( _Ｗ１ － _Ｗ０ )/ Find S).

[10] The average value ((W ₁ -W ₀ )/S) obtained for five non-slip protrusions 20 of the same shape is the "residual liquid surface density" of the anti-slip protrusions 20 of that shape. do.

In addition, in the shoe sole of the present invention, by adopting the above configuration, it is possible to suppress the sliding distance for a stainless steel plate coated with glycerin and having an inclination angle of 50° to 15 mm or less.

This glide distance can be made shorter, such as 10 mm or less, 7 mm or less, or 5 mm or less. Here, “the sliding distance for a stainless steel plate with an inclination angle of 50° coated with glycerin” is measured in the following manner.

[1] First, as shown in Figure 18 (a), the stainless steel plate 100 is installed at an inclination angle of 50°, glycerin 110 with a concentration of 90% is dropped on the upper surface, and the entire upper surface of the stainless steel plate 100 is applied. Apply a thin layer of glycerin.

The stainless steel plate (100) and glycerin (110) are the same as those used in “9.7 Lubrication Resistance Test” in “JIS T8101: Safety Shoes” (lubricating fluid: aqueous glycerin solution, test floor: stainless steel plate).

[2] Prepare a shoe sole sample (120) (the shoe sole to be measured is cut into a 5 cm (length) × 5 cm (horizontal) square), and apply glycerin as described above to the design surface (the surface on which anti-slip protrusions are formed). Apply sufficiently.

[3] Next, as shown in FIG. 18(b), the sample 120 is placed on the upper surface of the stainless steel plate 100, and the sample 120 is applied to the stainless steel plate 100 side at a pressure of 2 kg/cm ² . pressure.

The place where the sample 120 is installed on the stainless steel plate 100 is marked in advance (figure omitted).

[4] As shown in FIG. 18(b), place the weight 130 on the upper surface of the sample 120. The weight 130 uses a 15cm (length) x 10cm (width) x 5mm (thickness) stainless steel member (weight 596g). The sample 120 and the weight 130 are supported at the lower side in the inclined direction so as not to move.

[5] Release the support of the sample 120 and the weight 130 and slide the sample 120 (lower by gravity) on the stainless steel plate 100 as shown in FIG. 18(c).

[6] Movement distance ( ) is measured, and this moving distance (

As described above, the present invention makes it possible to provide a shoe sole that can exhibit excellent resistance to slippage even when the walking surface is slippery, such as when liquid is present on the walking surface. Additionally, it becomes possible to provide a method for manufacturing this sole.

Figure 1: (a) A view showing the shoe sole with the non-slip protrusions standing up, and (b) the shoe sole with the non-slip protrusions collapsed.
Figure 2: Perspective view illustrating the cross section (α ₁ ) and longitudinal section (α ₂ ) of the anti-slip protrusion
Figure 3: A diagram explaining the method of measuring the density of the residual liquid surface of the anti-slip protrusion (first half)
Figure 4: A diagram explaining the method of measuring the density of the residual liquid surface of the anti-slip protrusion (second half)
Figure 5: Perspective view showing the bottom side of the shoe sole of the first embodiment
Figure 6: Bottom view of the shoe sole of the first embodiment
Figure 7: (a) a perspective view and (b) a bottom view showing the bottom side of the anti-slip protrusion in the shoe sole of the first embodiment
Fig. 8: A cross-sectional view showing the area around the non-slip protrusion in the shoe sole of the first embodiment cut along the _A1 - _A1 plane of Fig. 7
Figure 9: Bottom view of the shoe sole of the second embodiment
Figure 10: Bottom view of shoe sole of third embodiment
Figure 11: A perspective view showing an example of the sample used in Experiment 1.
Figure 12: When the opening angle (θ ₁ ) of the non-slip protrusion is 45°, the ratio (H/W) of the height (H) of the portion excluding the pedestal portion of the non-slip protrusion to the longitudinal cross-sectional width (W) of the non-slip protrusion. Graph showing the relationship with the dynamic friction coefficient
Figure 13: When the opening angle (θ ₁ ) of the non-slip protrusion is 90°, the ratio (H/W) of the height (H) of the portion excluding the pedestal portion of the non-slip protrusion to the longitudinal cross-sectional width (W) of the non-slip protrusion. Graph showing the relationship with the dynamic friction coefficient
Figure 14: When the opening angle (θ ₁ ) of the non-slip protrusion is 140°, the ratio (H/W) of the height (H) of the portion excluding the pedestal portion of the non-slip protrusion to the longitudinal cross-sectional width (W) of the non-slip protrusion. Graph showing the relationship with the dynamic friction coefficient
Figure 15: A photograph showing the residual liquid surface density being measured for (a) a V-shaped anti-slip protrusion in the cross section, (b) a square anti-slip protrusion in the cross section, and (c) a circular anti-slip protrusion in the cross section.
Figure 16: (a) anti-slip protrusions with a surface roughness (Ra) of 0.3 μm, (b) anti-slip protrusions with a surface roughness (Ra) of 0.6 μm, and (c) non-slip protrusions with a surface roughness (Ra) of 7.4 μm A photo showing the density of the residual liquid surface being measured against the prevention protrusion.
Figure 17: A photograph showing the residual liquid surface density being measured for (a) an anti-slip protrusion with an edge radius of 0.07 mm and (b) an anti-slip protrusion with an edge radius of 0.57 mm.
Figure 18: A diagram explaining the method of measuring the sliding distance of a stainless steel plate with an inclination angle of 50° coated with glycerin

Embodiments of the shoe sole of the present invention will be described in detail with reference to the drawings. Hereinafter, the sole of the present invention will be described using three embodiments (the first embodiment, the second embodiment, and the third embodiment) as examples.

However, the technical scope of the shoe sole of the present invention is not limited to this embodiment.

The shoe sole of the present invention may be appropriately modified without impairing the spirit of the invention.

1. Shoe sole of the first embodiment

First, the shoe sole of the first embodiment will be described. Fig. 5 is a perspective view showing the bottom side of the shoe sole of the first embodiment. Figure 6 is a bottom view of the shoe sole of the first embodiment.

As shown in FIGS. 5 and 6, the shoe sole 10 of the first embodiment has a base portion 10 and a plurality of anti-slip protrusions 20.

The shoe sole of the first embodiment is made by molding an elastomer using a mold, and the base portion 10 and a plurality of anti-slip protrusions 20 are formed integrally.

Examples of elastomers used in shoe soles include thermosetting elastomers (vulcanized rubber, etc.) and thermoplastic elastomers.

For example, one or more types selected from the group consisting of synthetic rubber, natural rubber, thermoplastic styrene butadiene rubber (SBS), styrene-based thermoplastic elastomer (SIS), ethylene vinyl acetate copolymer (EVA), polyurethane, and polyvinyl chloride. An elastomer made of an elastomer and a rubber compound can be selected as the elastomer for forming shoe soles.

The hardness of the shoe sole is appropriately determined depending on the purpose of the shoe sole. However, if the shoe sole is too soft, it becomes difficult to maintain the strength of the anti-slip convex (20).

For this reason, the hardness of shoe soles (value measured with a hardness meter A; the same applies hereinafter) is usually set to 10 degrees or higher.

The hardness of the shoe sole is preferably 20 degrees or more, more preferably 30 degrees or more, and even more preferably 35 degrees or more.

However, if the shoe sole is too hard, it may be difficult for the anti-slip protrusion 20 to be elastically deformed, making it difficult to obtain the desired durability. Additionally, there is a risk that the shoe's comfort will worsen due to the poor cushioning properties of the sole.

For this reason, the hardness of the shoe sole is preferably 70 degrees or less, more preferably 60 degrees or less, and even more preferably 50 degrees or less.

1.1 Base part

The base portion 10 is made of a member roughly shaped like the sole of a foot. This base portion 10 is disposed at the bottom of the shoe.

The base portion 10 consists of a front portion 11, a rear portion 12, and a middle portion 13.

The front part 11 is a part placed below the toe, the rear part 12 is a part placed below the heel, and the middle part 13 is a part placed below the center of the sole.

The base portion 10 may be curved along the front-to-back direction so that the bottom surface is convex downward.

However, in the shoe sole of the first embodiment, the base portion 10 is formed in a flat shape, and the lower surface of the front portion 11, the lower surface of the middle portion 13, and the lower surface of the rear portion 12 are continuous on the same surface. I'm doing it.

Accordingly, a wider area of the shoe sole is brought into contact with the walking surface (more anti-slip protrusions are in contact with the walking surface), thereby making it possible to increase the durability of the shoe sole.

1.2 Non-slip protrusions

The anti-slip protrusion 20 is intended to prevent the shoe sole from slipping on the walking surface, and is provided to protrude downward from the lower surface of the base portion 10.

The cross section ( _α1 ) of each anti-slip protrusion 20 (see FIG. 2(a), hereinafter the same) is V-shaped. The anti-slip protrusions 20 are repeatedly arranged at predetermined intervals.

In the shoe sole of the first embodiment, anti-slip protrusions 20 are provided on the entire area of the lower surface of the base portion 10.

In this way, since the cross-section ( _α1 ) of the anti-slip protrusion 20 is V-shaped, the anti-slip protrusion 20 becomes difficult to fall over in all directions including the front-back direction and the left-right direction.

In addition, as already described, the edge 23 at the boundary between the lower surface 21 and the side 22 of the anti-slip protrusion 20 is effective in preventing slipping, and the anti-slip protrusion 20 is formed in a V-shape. By doing this, it is easy to secure the length of this edge 23 (the total length surrounding the anti-slip protrusion 20).

In addition, it is possible to improve drainage when the anti-slip protrusion 20 is grounded against a walking surface where liquid (or liquid matter) such as water is present.

The opening angle θ ₁ of the anti-slip protrusion 20 (see Fig. 7(b) listed later) is not particularly limited as long as it is greater than 0° and smaller than 180°.

However, if the opening angle 1 of the anti-slip protrusion 20 is made too small, the anti-slip protrusion 20 tends to fall in the left and right directions.

For this reason, the opening angle (θ ₁ ) of the anti-slip protrusion 20 is usually 50° or more. The opening angle θ ₁ of the anti-slip protrusion 20 is preferably 60° or more, more preferably 70° or more, and even more preferably 80° or more.

However, if the opening angle θ ₁ of the anti-slip protrusion 20 is made too large, the anti-slip protrusion 20 becomes prone to collapse in the front-back direction (the direction connecting the V-shaped opening and the vertex).

For this reason, the opening angle θ ₁ of the anti-slip protrusion 20 is generally considered to be 130° or less. The opening angle θ ₁ of the anti-slip protrusion 20 is preferably set to 120° or less, more preferably 110° or less, and even more preferably 100° or less.

In the shoe sole of the first embodiment, the opening angle θ ₁ of the anti-slip protrusion 20 is set to 90°.

Additionally, in the shoe sole of the first embodiment, all anti-slip protrusions 20 are arranged so that the open side of the V shape they form faces forward (towards the toe).

Accordingly, it becomes possible to reliably receive the load applied from the front of the anti-slip protrusion 20 to the non-slip protrusion 20 when walking.

However, when applied to shoes that are expected to hold up in the left and right directions, such as sports shoes, anti-slip protrusions 20 in other directions may be provided, such as mixing anti-slip protrusions 20 with a V shape open to the left or right. .

Fig. 7 shows an anti-slip protrusion 20 in the shoe sole of the first embodiment. FIG. 7 (a) is a perspective view showing the lower surface of the anti-slip protrusion 20, and FIG. 7 (b) is a bottom view of the anti-slip protrusion 20.

Fig. 8 is a cross-sectional view showing the periphery of the non-slip protrusion 20 of the shoe sole of the first embodiment cut along the plane A1 - A1 in Fig. 7(b).

The cross-sectional size of the anti-slip protrusion 20 is constant at the tip side (bottom side) of the anti-slip protrusion 20 (constant regardless of the upper and lower position), but as shown in FIGS. 7 and 8, the size of the cross section is constant The portion near the prevention protrusion 20 (near the top) is formed to become larger as it approaches the base portion 10.

That is, the pedestal portion 24 whose cross-section increases as it approaches the base portion 10 is provided near the anti-slip protrusion portion 20 (connection portion with the base portion 10).

As shown in FIG. 7(b), when the anti-slip protrusion 20 is viewed from the bottom side, the pedestal portion 24 appears to surround the anti-slip protrusion 20.

As already described, in order to increase the resistance of the anti-slip protrusion 20, it is important that a wide area of the lower surface 21 of the anti-slip protrusion 20 is in close contact with the walking surface. The load (pedestrian's weight) during walking is important. ), if the anti-slip protrusion 20 collapses, it becomes difficult for the lower surface 21 of the anti-slip protrusion 20 to come into close contact with the walking surface.

Advantage: By providing the pedestal portion 24 with a large cross-section near the non-slip protrusion 20, the anti-slip protrusion 20 is reinforced and becomes difficult to fall over.

Additionally, the presence of the pedestal portion 24 makes it difficult for foreign substances such as trash to become trapped in the gap between the adjacent non-slip protrusions 20.

Excluding the pedestal portion 24 of the anti-slip protrusion 20 with respect to the width W (FIG. 7) of the longitudinal cross-section α ₂ (see FIG. 2(b), hereinafter the same) of the non-slip protrusion 20. It is desirable that the ratio (H/W) of the height (H) of the part (Figure 7) is 0.1 or more.

If this ratio (H/W) is less than 0.1, there is a risk that the edge 23 of the anti-slip protrusion 20 may not be easily caught on the walking surface.

The ratio (H/W) is more preferably 0.15 or more, and even more preferably 0.2 or more.

However, if the ratio (H/W) is made too large, it becomes difficult for the pedestal portion 24 alone to resist the force in the direction of collapsing the anti-slip protrusion 20.

For this reason, it is preferable that the ratio (H/W) is 1 or less. The ratio (H/W) is more preferably 0.8 or less, further preferably 0.6 or less, and especially preferably 0.5 or less.

As described later, the resistance (dynamic friction coefficient) of the shoe sole is maximized when the ratio (H/W) is around 0.25.

The specific value of the width (W) W (Figure 8) of the longitudinal cross-section (α ₂ ) of the anti-slip protrusion 20 is not particularly limited. However, if the width W of the anti-slip protrusion 20 is too narrow, the anti-slip protrusion 20 becomes prone to damage.

In addition, it becomes difficult to set the above ratio (H/W) to 1 or less, making it difficult to increase the durability of the shoe sole.

For this reason, the width (W) of the anti-slip protrusion 20 is generally considered to be 1 mm or more. The width W of the anti-slip protrusion 20 is preferably 1.5 mm or more, more preferably 2 mm or more, and even more preferably 2.5 mm or more.

However, if the width (W) of the anti-slip protrusions 20 is too wide, it becomes difficult to increase the number of anti-slip protrusions 20 installed on the base portion 10, and the number of edges 23 that are effective in preventing slipping increases. It becomes difficult to secure.

In addition, it becomes difficult to set the ratio (H/W) to 0.1 or more, making it difficult to increase the durability of the shoe sole.

For this reason, the width W of the anti-slip protrusion 20 is usually 10 mm or less. The width W of the anti-slip protrusion 20 is preferably 7 mm or less, and more preferably 5 mm or less.

The specific value of the height H (FIG. 8) of the non-slip protrusion 20 excluding the pedestal portion 24 is not particularly limited.

However, if the height H of the anti-slip protrusion 20 is made too low, there is a risk that the edge 23 of the anti-slip protrusion 20 may become less effective in preventing slip.

In addition, it becomes difficult to set the ratio (H/W) to 0.1 or more, making it difficult to increase the durability of the shoe sole.

For this reason, the height (H) of the anti-slip protrusion 20 is usually set to 0.5 mm or more. The height H of the anti-slip protrusion 20 is preferably 0.7 mm or more, more preferably 0.9 mm or more, and even more preferably 1 mm or more.

However, if the height H of the anti-slip protrusion 20 is made too high, it becomes difficult to set the ratio (H/W) to 1 or less, making it difficult to increase the durability of the shoe sole.

For this reason, the height H of the anti-slip protrusion 20 is usually 5 mm or less. The height H of the anti-slip protrusion 20 is preferably 3 mm or less, more preferably 2 mm or less, and even more preferably 1.5 mm or less.

The horizontal width W ₁ of the portion of the anti-slip protrusion 20 excluding the pedestal portion 24 (FIG. 7(b)) is not particularly limited. However, if the horizontal width W ₁ of the anti-slip protrusions 20 is made too narrow, each anti-slip protrusion 20 becomes small, making it difficult to maintain the strength of the anti-slip protrusions 20.

Additionally, forming the anti-slip protrusion 20 becomes difficult. For this reason, the horizontal width (W ₁ ) of the anti-slip protrusion 20 is usually 5 mm or more.

The horizontal width ( _W1 ) of the anti-slip protrusion 20 is preferably 10 mm or more, and more preferably 12 mm or more.

However, if the horizontal width W ₁ of the anti-slip protrusions 20 is made too wide, each anti-slip protrusion 20 becomes large, making it difficult to densely arrange the anti-slip protrusions 20.

Therefore, it becomes difficult to secure the total length of the edge 23, which is effective in preventing slipping.

For this reason, the horizontal width (W ₁ ) of the anti-slip protrusion 20 is usually 50 mm or less. The horizontal width ( _W1 ) of the anti-slip protrusion 20 is preferably 40 mm or less, more preferably 30 mm or less, and even more preferably 20 mm or less.

In the shoe sole of the first embodiment, the horizontal width ( _W1 ) of the anti-slip protrusion 20 was set to about 14 mm.

The radius R (FIG. 8) of the edge 23 of the anti-slip protrusion 20 (the edge of the boundary between the lower surface 21 and the side surface 22 of the anti-slip protrusion 20) (FIG. 8) is set to 0.5 mm or less.

This makes it easy for the edge 23 of the anti-slip protrusion 20 to get caught on the walking surface. Additionally, it is possible to easily increase the drainage properties of shoe soles.

The radius R of the edge 23 of the anti-slip protrusion 20 is preferably 0.4 mm or less, more preferably 0.3 mm or less, and even more preferably 0.2 mm or less.

The lower limit of the radius R of the edge 23 of the anti-slip protrusion 20 is not particularly limited. However, it is very difficult to make the radius (R) of the edge 23 of the anti-slip protrusion 20 smaller than 0.03 mm due to reasons such as the production of molds for forming shoe soles.

The radius (R) of the edge 23 of the anti-slip protrusion 20 is usually 0.05 mm or more, and in most cases, 0.07 mm or more.

It is desirable that the lower surface 21 of the anti-slip protrusion 20 be smooth (shape without irregularities). Accordingly, it is possible to secure a wide contact area of the lower surface 21 of the anti-slip protrusion 20 with respect to the walking surface.

In addition, when the lower surface 21 of the anti-slip protrusion 20 touches the walking surface, not only the liquid on the lower side of the anti-slip protrusion 20 but also the air is easily pushed out around the anti-slip protrusion 20, preventing slipping. A weak vacuum state can be created at the boundary between the lower surface 21 of the prevention protrusion 20 and the walking surface.

Accordingly, the resistance to slippage of the shoe sole can be further increased in a state in which the lower surface 21 of the anti-slip protrusion 20 is sucked into the walking surface.

Therefore, it is desirable that the surface roughness (Ra) of the lower surface 21 of the anti-slip protrusion 20 is 1.5 μm or less. The surface roughness (Ra) of the lower surface 21 of the anti-slip protrusion 20 is more preferably 1.0 μm or less, more preferably 0.7 μm or less, and even more preferably 0.5 μm or less.

The lower limit of the surface roughness (Ra) of the lower surface 21 of the anti-slip protrusion 20 is not particularly limited, but it is very difficult to set it to less than 0.1 μm due to reasons such as the production of molds for forming shoe soles.

For this reason, the surface roughness (Ra) of the lower surface 21 of the anti-slip protrusion 20 is usually 0.1 m or more, and in most cases, 0.2 m or more. In the shoe sole of the first embodiment, the surface roughness (Ra) of the lower surface 21 of the anti-slip protrusion 20 is about 0.3 μm.

As shown in FIG. 8, the pedestal portion 24 has a trapezoidal shape with its longitudinal cross-section (α2) extending toward the base portion 10, and its side surface has an angle θ2 with respect to the lower surface of the base portion 10. It is inclined and connected to the side 22 of the anti-slip protrusion 20.

The pedestal portion 24 not only prevents the anti-slip protrusion 20 from falling over, but also improves the drainage properties of the non-slip protrusion 20.

Therefore, the durability of shoe soles can be improved. In addition, it is possible to prevent foreign substances from becoming caught in the gap between the neighboring non-slip protrusions 20.

The height _H1 (FIG. 8) of the pedestal portion 24 is not particularly limited. However, if the pedestal portion 24 is too low, the significance of installing the pedestal portion 24 is reduced.

For this reason, the height _H1 of the pedestal portion 24 is usually set to 0.1 mm or more. The height ( _H1 ) of the pedestal portion 24 is preferably 0.3 mm or more, and more preferably 0.4 mm or more.

However, if the stand 24 is set too high, there is a risk that the stand 24 itself may be easily deformed. For this reason, the height ( _H1 ) of the pedestal portion 24 is usually 3 mm or less.

The height H1 of the pedestal portion 24 is preferably 2 mm or less, and more preferably 1 mm or less.

In the shoe sole of the first embodiment, the height ( _H1 ) of the pedestal portion 24 was set to 0.5 mm.

The inclination angle θ ₂ (FIG. 8) of the pedestal portion 24 is also not particularly limited. However, if the inclination angle θ ₂ of the pedestal portion 24 is too small, it becomes necessary to ensure a wide spacing D1 and D2 (FIG. 6) between the adjacent anti-slip protrusions 20, so that the anti-slip protrusions 20 are It becomes difficult to place it densely.

For this reason, the inclination angle θ ₂ of the pedestal portion 24 is usually set to 10° or more. The inclination angle θ ₂ of the pedestal portion 24 is preferably 20° or more, more preferably 30° or more, and even more preferably 40° or more.

However, if the inclination angle θ ₂ of the pedestal 24 is too large (close to 90°), the reinforcing effect of the anti-slip protrusion 20 by the pedestal 24 becomes limited.

For this reason, the inclination angle θ ₂ of the pedestal portion 24 is usually set to 80° or less. The inclination angle θ ₂ of the pedestal portion 24 is preferably 70° or less, more preferably 60° or less, and even more preferably 50° or less.

In the shoe sole of the first embodiment, the inclination angle θ ₂ of the pedestal portion 24 was set to 45°.

Neither the gap width D1 (FIG. 6) of the anti-slip protrusions 20 adjacent to the left and right nor the gap width D2 (FIG. 6) of the anti-slip protrusions 20 adjacent to the front and rear are particularly limited.

However, if the gap width D1 or gap width D2 of the non-slip protrusions 20 is too narrow, foreign substances such as trash can easily clog the gaps of neighboring anti-slip protrusions 20.

For this reason, the gap width D1 and gap width D2 of the anti-slip protrusion 20 are usually each 1 mm or more.

It is preferable that the gap width D1 and the gap width D2 of the anti-slip protrusion 20 are each 1.5 mm or more, and more preferably 2 mm or more.

However, if the gap width D1 or gap width D2 of the anti-slip protrusions 20 is too wide, it becomes difficult to densely arrange the anti-slip protrusions 20.

For this reason, the gap width D1 and gap width D2 of the anti-slip protrusion 20 are usually each 5 mm or less.

It is preferable that the gap width D1 and the gap width D2 of the anti-slip protrusion 20 are each 4 mm or less, and more preferably 3 mm or less.

1.3 Summary

Since the shoe sole of the first embodiment adopts the above-mentioned structure, it has very excellent resistance to corrosion. In particular, it has excellent drainage properties, allowing you to walk comfortably without slipping even on walking surfaces containing liquids such as water.

The residual liquid surface density measured in the order of FIGS. 3 and 4 described above is mostly 6 mg/cm2 in the non-slip protrusions used in general shoe soles, but is 5 mg/cm2 or less in the shoe sole of the first embodiment. It is also possible to suppress less.

As will be described later, the density of the residual liquid surface of the anti-slip protrusion 20 may be 4.5 mg/cm2 or less, or 4 mg/cm2 or less.

1.4 Purpose

The shoe sole of the present invention is not particularly limited in its use and can be suitably applied as the sole of various types of shoes.

The shoe sole of the present invention can be suitably applied to commuting or school shoes, stylishly worn shoes, sports shoes, work shoes, etc.

Among them, it can be suitably applied as the sole of a shoe for walking on a smooth walking surface, and it can be particularly preferably applied as the sole of a shoe for walking on a slippery walking surface covered with liquid such as water or oil.

Such shoes include kitchen shoes worn in food factories or restaurant kitchens, and work shoes worn in metal processing plants or construction scaffolding.

2. Sole of the second embodiment

Next, the shoe sole of the second embodiment will be described. The shoe sole of the second embodiment will be described limited to a structure different from that of the shoe sole of the first embodiment.

For configurations not specifically mentioned in the shoe sole of the second embodiment, the same configuration as that applied to the shoe sole of the first embodiment can be applied. Fig. 9 is a bottom view of the shoe sole of the second embodiment.

In the shoe sole of the first embodiment, anti-slip protrusions 20 were uniformly provided on the entire area of the lower surface of the base portion 10, as shown in FIG. 6.

On the other hand, in the shoe sole of the second embodiment, as shown in FIG. 9, anti-slip protrusions 20 are uniformly installed on the lower surfaces of the front portion 11 and the rear portion 12 of the base portion 10, but the base portion ( In the middle portion 13 of 10), there is an empty area β that is not provided with the anti-slip protrusion 20.

Since the middle part 13 of the base part 10 does not receive much load compared to the front part 11 or the rear part 12, the anti-slip protrusion 20 of the middle part 13 is attached to the front part 11 or the rear part (11). It is not as effective in preventing slipping as the anti-slip protrusion 20 of 12). Therefore, the middle portion 13 may be provided with an empty area (β).

3. Shoe sole of the third embodiment

Next, the shoe sole of the third embodiment will be described. The shoe sole of the third embodiment will be described limited to a structure different from that of the shoe sole of the first embodiment.

For configurations not specifically mentioned in the shoe sole of the third embodiment, the same configuration as that applied to the shoe sole of the first embodiment or the shoe sole of the second embodiment can be applied. Figure 10 shows the shoe of the third embodiment. This is a bottom view of the sole.

In the shoe sole of the first embodiment, as shown in FIG. 6, all the anti-slip protrusions 20 are arranged in the same direction, and the V-shaped opening formed by all the anti-slip protrusions 20 faces toward the toe (front). there was.

On the other hand, in the shoe sole of the third embodiment, as shown in FIG. 10, an anti-slip protrusion 20 with a V-shaped opening facing toward the toe side (front) and an anti-slip protrusion with a V-shaped opening toward the heel side (rear) ( 20) are mixed.

More specifically, the protrusion rows 20a, 20b, 20c, 20d, 20e, which are made up of a plurality of anti-slip protrusions 20 lined up in the front-back direction, are arranged side by side in the left and right directions. In the shoe sole of the third embodiment, there are specific In the rows of protrusions (20b, 20d), the V-shaped opening is composed of anti-slip protrusions (20) facing the toe side (front), and in the rows of protrusions (20a, 20c, 20e) next to the rows of protrusions (20b, 20d), V The opening of the ruler constitutes a non-slip protrusion 20 that faces the heel side (rear).

Accordingly, good durability is achieved not only when a load is applied from the toe side (front) of the shoe sole to the heel side (rear), but also when a load is applied from the heel side (rear) of the shoe sole to the toe side (front). It can be active.

In addition, anti-slip protrusions 20 with V-shaped openings facing left and anti-slip protrusions 20 with V-shaped openings facing right can be mixed.

In this way, by mixing anti-slip protrusions 20 in different directions, the shoe sole can be made to exhibit good resistance to loads from all directions.

4) Experiment

To confirm the effectiveness of the shoe sole of the present invention, the following experiments 1 to 5 were performed.

4.1 Experiment 1

Figure 11 is a perspective view showing an example of the sample used in Experiment 1. In Experiment 1, as shown in FIG. 1, a sample with a plurality of anti-slip protrusions 20 formed on a base portion 10 measuring 50 mm in width and height was manufactured and its dynamic friction coefficient was measured.

The sample had a ratio (H/W) of 0 by changing the width (W) (FIG. 7) and height (H) (FIG. 8) of the anti-slip protrusion 20 as shown in Table 1 below (Sample 1, 5, 9, 13, 17, 22, 27, 31) and 0,25 (samples 2,6, 10, 14, 18, 23, 28, 32) and 0.5 (samples 11, 15, 19, 24) and 0.75 (samples 3, 7, 12, 16, 20, 25) and 1 (samples 4, 21, 264) were prepared.

Additionally, the opening angle 1 (FIG. 7(b)) of the anti-slip protrusion 20 was also changed depending on the sample. A total of 34 types of samples were prepared.

In all samples 1 to 34, the directions of the anti-slip protrusions 20 were unified. In addition, the thickness T (FIG. 8) of the base portion was unified to 2.5 mm, and the height of the pedestal portion 24 (FIG. 8) was unified to 1 mm.

In addition, the spacing D1 (FIG. 6) of the anti-slip protrusions 20 adjacent to the left and right is unified to 2.03 mm, so that the spacing D2 (FIG. 6) of the anti-slip protrusions 20 adjacent to the front and back is equal to the anti-slip protrusions. It was set to be 0.7 times the width (W) of (20) (Figure 7).

In addition, the radius of the edge 23 formed by the lower surface 21 and the side 22 of the anti-slip protrusion 20 is 0.05 mm, and the surface roughness (Ra) of the lower surface 21 of the anti-slip protrusion 20 is 0.1. It was set to m.

Samples 1 to 34 were all made of synthetic rubber. Samples 1 to 34 used the V-shaped cross section shown in Figure 11, and the JIS-A hardness of samples 1 to 34 was the same at 60 degrees.

The dynamic friction coefficient measurements of Samples 1 to 34 were conducted based on the method specified in “JIS T 8101.” However, the vertical load was set to 200N.

Table 1 and Figures 12 to 14 show the results of measuring the dynamic friction coefficient of shoe soles for Samples 1 to 34.

FIG. 12 shows the measurement results when the opening angle (θ ₁ ) of the anti-slip protrusion 20 is 45°, and FIG. 13 shows the measurement results when the opening angle (θ ₁ ) of the anti-slip protrusion 20 is 90°. 14 shows measurement results when the opening angle θ ₁ of the anti-slip protrusion 20 is 140°.

opening angle width height ratio Dynamic friction coefficient sample 1



45°
2mm 0mm 0 0.377 sample 2 0.5mm 0.25 1.006 Sample 3 1.5mm 0.75 0.921 Sample 4 2mm One 0.846 Sample 5

7mm 0mm 0 0.329 Sample 6 1.75mm 0.25 0.781 Sample 7 5.25mm 0.75 0.767 Sample 8 7mm One 0.699 Sample 9








90°

2mm 0mm 0 0.493 Sample 10 0.5mm 0.25 0.983 Sample 11 1mm 0.5 0.789 Sample 12 1.5mm 0.75 0.721 Sample 13

4mm 0mm 0 0.513 Sample 14 1mm 0.25 0.847 Sample 15 2mm 0.5 0.723 Sample 16 3mm 0.75 0.698 Sample 17

5mm 0mm 0 0.488 Sample 18 1.25mm 0.25 0.854 Sample 19 2.5mm 0.5 0.784 Sample 20 3.75mm 0.75 0.686 Sample 21 5mm One 0.559 Sample 22

7mm 0mm 0 0.423 Sample 23 1.75mm 0.25 0.881 Sample 24 3.5mm 0.5 0.790 Sample 25 5.25mm 0.75 0.634 Sample 26 7mm One 0.588 Sample 27



140°

2mm 0mm 0 0.363 Sample 28 0.5mm 0.25 0.537 Sample 29 1.5mm 0.75 0.516 Sample 30 2mm One 0.479 Sample 31

7mm 0mm 0 0.225 Sample 32 1.75mm 0.25 0.634 Sample 33 5.25mm 0.75 0.516 Sample 34 7mm One 0.479

According to the above measurement results, regardless of the opening angle (θ1) or width (W) of the anti-slip protrusion 20, the dynamic friction coefficient changes depending on the ratio (H/W), and the ratio (H/W) varies from 0.25 to 0.25. When in the 0.5 range, the dynamic friction coefficient took a value close to the peak, showing excellent resistance to resistance.

Additionally, it was confirmed that when the ratio (H/W) was greater than 0 and less than 1, the dynamic friction coefficient became greater than 0.5.

4.2 Experiment 2

Next, an experiment (Experiment 2) was conducted to determine how the shape of the anti-slip protrusion 20 affects the drainage properties of the non-slip protrusion 20.

Specifically, the residual liquid surface for each of the cross-section V-shaped anti-slip protrusion 20 (sample 40), the cross-section square anti-slip protrusion 20 (sample 41), and the cross-section circular anti-slip protrusion 20 (sample 42). Density was measured.

The density of the residual liquid surface of the anti-slip protrusion 20 was measured according to the method described above (the method described using FIGS. 3 and 4).

In the cross-sectional V-shaped anti-slip protrusion 20 (sample 40), the V-shaped opening angle (θ1) (Figure 7) is set to 90°, the width (W) (Figure 7) is set to 3 mm, and the height (H) (Figure 7) is set to 90°. 8) is set to 1.5 mm, the radius (R) of the edge 23 (FIG. 8) formed by the lower surface 21 and the side surface 22 of the anti-slip protrusion 20 is set to 0.07 mm, and the anti-slip protrusion 20 is set to 0.07 mm. ), the surface roughness (Ra) of the lower surface 21 was set to 0.3 μm, and the area of the lower surface 21 (ground surface) was set to 0.58 cm ² .

Conditions such as adjusting the area of the lower surface 21 (ground surface) to 0.58 cm ² in the cross-section square anti-slip protrusion 20 (sample 41) and the cross-section circular-shaped anti-slip protrusion 20 (sample 42) are the cross section V It was adjusted as much as possible to the shaped non-slip protrusion 20 (sample 40).

FIG. 15 shows a photograph showing the residual liquid surface density of the anti-slip protrusion 20 being measured.

Figure 15 (a) shows the measurement being performed on the cross-section V-shaped anti-slip protrusion 20 (sample 40), and Fig. 15 (b) shows the measurement on the cross-section square anti-slip protrusion 20 (sample 41). is being carried out, and Figure 15(c) is a measurement being carried out on the anti-slip protrusion 20 (sample 42) having a circular cross-sectional shape.

15 (a), (b), and (c) show that the resin film 62 (FIG. 3) after the test solution 70 has been cured is removed from the aluminum plate 61 2 (FIG. 3), and the resin film (FIG. 62) (Transparent film) was photographed from the back side (the side opposite to the side on which the anti-slip protrusion 20 is placed).

As shown in Figure 15 (a), in the cross-sectional V-shaped anti-slip protrusion 20 (sample 40), the lower surface 21 of the anti-slip protrusion 20 is clearly visible, so that the lower surface 21 of the anti-slip protrusion 20 and It can be seen that almost no sample solution 70 remains between the resin films 62.

In contrast, the non-slip protrusion 20 (sample 41) having a square cross-section shown in FIG. 15(b) or the anti-slip protrusion 20 (sample 42) having a circular cross-section shown in FIG. 15(c) shows a non-slip effect. Since the lower surface 21 of the protrusion 20 is not clearly visible, it can be seen that a considerable amount of the test solution 70 remains between the lower surface 21 of the anti-slip protrusion 20 and the resin film 62.

Table 2 below shows the residual liquid surface density measurement results (average value of N=5) of samples 40 to 42.

Residual liquid surface density

Sample 40 (V-shaped cross section)

1.72mg/ ^cm2
Sample 41 (square cross section)

6.76mg/ ^cm2
Sample 42 (circular cross-section)

6.00mg/ ^cm2

Looking at Table 2, the residual liquid surface density of the anti-slip protrusion 20 (sample 40) with a V-shaped cross-section is significantly lower than that of the anti-slip protrusion 20 (sample 41 or 42) with a square cross-section or a circular cross-section. It can be seen that it is done.

From this, it was found that having the anti-slip protrusion 20 in a V-shaped cross section is an important factor in improving the drainage properties of the anti-slip protrusion 20.

4.3 Experiment 3

Next, an experiment (Experiment 3) was conducted to determine how the surface roughness (Ra) of the lower surface 21 of the anti-slip protrusion 20 affects the drainage properties of the anti-slip protrusion 20.

Specifically, the anti-slip protrusion 20 (sample 50) with a surface roughness (Ra) of the lower surface 21 of 0.3 ㎛, the anti-slip protrusion 20 (sample 51) with a surface roughness (Ra) of the lower surface 21 of 0.6 ㎛ ), the anti-slip protrusion 20 (sample 52) with a surface roughness (Ra) of the lower surface 21 of 1.5 ㎛, and the anti-slip protrusion 20 (sample 53) with a surface roughness (Ra) of the lower surface 21 of 7.4 ㎛ ) The residual liquid surface density for each was measured.

Samples 50 to 53 all had V-shaped anti-slip protrusions 20 in cross section, and were used with the same dimensions and shape as sample 40 in Experiment 2, except that the surface roughness (Ra) of the lower surface 21 was changed.

Figure 16 shows a photograph showing the residual liquid surface density of the anti-slip protrusion 20 being measured.

Figure 16 (a) shows measurement being performed on the anti-slip protrusion 20 (sample 50) with a surface roughness (Ra) of 0.3 μm, and Figure 16 (b) shows a surface roughness (Ra) of 0.6 μm. Measurements are being performed on the anti-slip protrusions 20 (sample 51), and Figure 16(c) shows measurements on the anti-slip protrusions 20 (sample 52) with a surface roughness (Ra) of 1.5 μm. 16(d) shows that the surface roughness (Ra) is 7.4μm.

16 (a), (b), (c), and (d) show the resin film 62 (FIG. 3) after the test solution 70 has been cured, removed from the aluminum plate 62 (FIG. 3), and the resin film 62 (FIG. 3) is removed from the aluminum plate 62 (FIG. 3). The film 62 (transparent film) was photographed from the back side (the side opposite to the side on which the anti-slip protrusion 20 is placed).

As shown in Figure 16 (a), in sample 50, which has a very small surface roughness (Ra) of 0.3 μm, almost no test solution 70 remains below the lower surface 21 of the anti-slip protrusion 20.

In addition, as shown in FIG. 16(b), even in sample 51 with a surface roughness (Ra) of 0.6 m, almost no test solution 70 remains below the lower surface 21 of the anti-slip protrusion 20.

On the other hand, as shown in FIG. 16(c), the remaining test solution 70 began to become visible around sample 52, which had a surface roughness (Ra) of 1.5 μm, on the lower side 21 of the anti-slip protrusion 20.

As shown in FIG. 16(d), in sample 53, which has a large surface roughness (Ra) of 7.4 μm, test solution 70 remains throughout the lower surface 21 of the anti-slip protrusion 20. can be seen.

Table 3 below shows the residual liquid surface density measurement results (average value of N=5) for samples 50 to 53.

Residual liquid surface density

Sample 50 (Ra = 0.3μm)
1.72mg/ ^cm2

Sample 51 (Ra = 0.6μm)
3.45mg/ ^cm2

Sample 52 (Ra = 1.5μm)
5.17mg/ ^cm2

Sample 53 (Ra = 7.4μm)
6.90mg/ ^cm2

Looking at Table 3, it can be seen that as the surface roughness (Ra) of the lower surface 21 of the anti-slip protrusion 20 increases, the density of the residual liquid surface of the anti-slip protrusion 20 increases.

In other words, it can be seen that as the surface roughness (Ra) of the lower surface 21 of the anti-slip protrusion 20 decreases, the density of the residual liquid surface of the anti-slip protrusion 20 decreases.

From this, it was found that suppressing the surface roughness (Ra) of the lower surface 21 of the anti-slip protrusion 20 to small is an important factor in improving the drainage properties of the anti-slip protrusion 20.

4.4 Experiment 4

Finally, an experiment (Experiment 4) was conducted to investigate how the radius R of the edge 23 of the anti-slip protrusion 20 (FIG. 2(b)) affects the drainage of the non-slip protrusion 20.

Specifically, the anti-slip protrusion 20 (sample 60) with a radius (R) of the edge 23 of 0.07 mm and the anti-slip protrusion 20 (sample 61) with a radius (R) of the edge 23 of 0.57 mm. The residual liquid surface density for each was measured.

Samples 60 and 61 both had V-shaped anti-slip protrusions 20 in cross section and had the same dimensions and shape as sample 40 in Experiment 2, except that the radius (R) of the edge 23 was changed.

However, in sample 60, the area of the lower surface 21 (ground surface) was 0.58 cm ² , whereas in sample 61, the area of the lower surface 21 (ground surface) was 0.39 cm ² .

This is because, even if the cross-sectional area of the anti-slip protrusion 20 is the same, as the radius R of the edge 23 increases, the area of the lower surface 21 (ground surface) becomes smaller.

Figure 17 shows a photograph showing the residual liquid surface density of the anti-slip protrusion 20 being measured.

Figure 17 (a) shows measurement being performed on the anti-slip protrusion 20 (sample 60) with an edge radius (R) of 0.07 mm, and Figure 17 (b) shows the edge radius (R). Measurements are being taken on the anti-slip protrusion 20 (sample 61) of 0.57 mm.

17 (a) and (b) show the resin film 62 (FIG. 3) after the test solution 70 has been cured being removed from the aluminum plate 62 (FIG. 3), and the resin film 62 (transparent film) ) was taken from the back side (the side opposite to the side on which the anti-slip protrusion 20 is placed).

As shown in Figure 17 (a), the edge 23 is clearly visible in sample 60 in which the radius (R) of the edge 23 is small at 0.07 mm, while the edge 23 is clearly visible as shown in Figure 17 (b). It can be seen that the edge 23 appears blurred in sample 61, which has a large radius (R) of 0.57 mm.

Table 4 below shows the residual liquid surface density measurement results (average value of N=5) of Samples 60 and 61.

Residual liquid surface density

Sample 60 (R = 0.07mm)

1.72mg/ ^cm2
Sample 61 (R = 0.77mm)

5.14mg/ ^cm2

Looking at Table 4, it can be seen that as the radius (R) of the edge 23 of the anti-slip protrusion 20 increases, the density of the residual liquid surface of the anti-slip protrusion 20 increases.

Conversely, it can be seen that as the radius R of the edge 23 of the anti-slip protrusion 20 decreases, the density of the residual liquid surface of the anti-slip protrusion 20 decreases.

Through this, it was found that reducing the radius (R) of the edge 23 of the non-slip protrusion 20 is an important factor in improving the drainage of the non-slip protrusion 20.

4.5 Experiment 5

Next, an experiment (Experiment 5) was conducted to determine how the surface roughness (Ra) of the anti-slip protrusion 20 affects the anti-activity ability on a floor wet with liquid.

Specifically, a shoe sole sample (sample 70) in which the surface roughness (Ra) of the lower surface 21 of the anti-slip protrusion 20 was adjusted to 0.2 μm, and a sole sample (sample 70) in which the same surface roughness (Ra) was adjusted to 0.75 μm ( For each sole sample (sample 72) with the same surface roughness (Ra) adjusted to 1.5 μm as sample 71), the sliding distance (hereinafter simply referred to as the sliding distance) on a stainless steel plate with an inclination angle of 50° coated with glycerin was calculated. This sliding distance was measured according to the method described above (method explained using Figure 18).

Samples 70 to 72 all had V-shaped anti-slip protrusions 20 in cross section, and had the same dimensions and shape as sample 40 in Experiment 2, except that the surface roughness (Ra) of the lower surface 21 was changed.

Table 5 below shows the measurement results of the sliding distances of samples 70, 71, and 72.

Run distance

Sample 70
(Surface roughness (Ra): 0.2μm)

5mm
Sample 71
(Surface roughness (Ra): 0.75μm)

10mm
Sample 72
(Surface roughness (Ra): 1.5μm)

15mm

Looking at Table 5 above, it can be seen that the smaller the surface roughness (Ra) of the anti-slip protrusion 20 is (the softer it is), the shorter the sliding distance is (making it less slippery).

In general, there is an image that the rougher bottom of the anti-slip protrusion 20 increases friction and prevents slipping, but in a liquid environment, the opposite result is obtained.

This is believed to be due to the increase in drainage of the anti-slip protrusions 20 by smoothing the lower surface of the anti-slip protrusions 20.

From the above, it was shown that reducing the surface roughness (Ra) of the bottom surface of the anti-slip protrusion 20 is important in improving the drainage properties of the anti-slip protrusion 20.

10: Base part
11: Front part
12: back part
13: Middle part
20: Non-slip protrusion
20a: Protuberance row
20b: Protuberance row
20c: aponeurosis
20d: Paranoid fever
20e: Protuberance row
21: Bottom surface (ground surface) of anti-slip protrusion
22: Side of anti-slip protrusion
23: Edge of the boundary between the lower surface and the side of the anti-slip protrusion
24: Pedestal part
50: walking surface
60: substrate
61: Aluminum plate
62: Resin film
63: Adhesive tape
70: test solution
80: Chu
90: tweezers
100: Stainless steel plate
110: Glycerin
120: sample
130: Chu
Ｄ _１ : Gap width of non-slip protrusions adjacent to each other on the left and right
Ｄ _２ : Gap width between non-slip protrusions adjacent to each other before and after
H: Height of the non-slip protrusion excluding the pedestal portion
H ₁ : Height of pedestal part
L: V-shaped line
R: Radius of the edge formed by the anti-slip protrusion (ground surface) and the side surface
W: Width of the longitudinal section of the non-slip protrusion
Ｘ: A run range for stainless steel plates of inclination angle of sliced glycerin
α ₁ : Cross section of anti-slip protrusion
α ₂ : Longitudinal cross section of anti-slip protrusion
β: empty area
θ ₁ : Opening angle of the anti-slip protrusion
θ ₂ : Inclination angle of the side of the pedestal part

Claims (6)

A base portion disposed at the bottom of the shoe,
A plurality of non-slip protrusions are formed to face downward from the lower surface of the base portion and have a V-shaped cross section,
In a shoe sole in which the base portion and the anti-slip protrusion portion are integrally formed of elastomer,
In the non-slip protrusion, a pedestal portion whose cross-section increases as it approaches the base portion is provided at the connection portion of the base portion,
The surface roughness (Ra) of the underside of the anti-slip protrusion is 1.5μm or less.
Shoe sole featuring .
According to paragraph 1,
Shoe soles in which the residual liquid surface density of each non-slip protrusion is 5 mg/cm ² or less.
According to claim 2,
A shoe sole with a sliding distance of 15 mm or less on a stainless steel plate coated with glycerin and with an inclination angle of 50°.
According to claim 3,
A shoe sole in which the radius of the edge formed by the bottom and side of the anti-slip protrusion is less than 0.5 mm.
According to claim 4,
A shoe sole in which the ratio (H/W) of the height (H) of the portion excluding the pedestal portion of the non-slip protrusion to the width (W) of the longitudinal section of the non-slip protrusion is in the range of 0.1 to 1.
A method for manufacturing a shoe sole according to any one of claims 1 to 5.