JP3710397B2 - nail - Google Patents

Description

【００１４】
表１において、凹部５の径が０．１ｍｍ以下、凹部５の個数が５ｍｍ² あたり３０以上、平面部７の面積比１０以上、５ｍｍ² あたりの凹部５相互の接触率０％の比較例１では、玄能５回打ち時点で塗膜８剥離率が１０〜２０％であり、凹部５径１．３ｍｍ以上、凹部５の個数が５ｍｍ² あたり２〜３、平面部７の面積比０．３〜０．５、５ｍｍ² あたりの凹部５相互の接触率０％の比較例２および凹部５の径が０．１〜０．８ｍｍの範囲にあるけれども、凹部５の個数が５ｍｍ² あたり４〜５、平面部７の面積比２．５〜３．５、５ｍｍ² あたりの凹部５相互の接触率１０〜２０％の比較例３では、玄能３回打ちの時点で塗膜８剥離率が１０〜２０％であり、凹部５の径が０．１〜１．０ｍｍ、５ｍｍ² あたりの凹部５の個数が８〜２０、平面部７の面積比１．０〜１．５であるけれども、５ｍｍ² あたりの凹部５相互の接触率が４０〜５０％の比較例４は玄能５回打ち時点で塗膜８剥離率が５〜１０％である。
【００１５】
【発明の効果】
本発明では釘頭部上面の塗膜密着性が格段に向上し、釘打込みに際しても塗膜の剥がれが殆んどなくなる。
【図面の簡単な説明】
図１〜図４は本発明の一実施例を示すものである。
【図１】釘斜視図
【図２】凹部説明図
【図３】マークの形状説明図
【図４】釘頭側断面図
【符号の説明】
１ 釘
３ 頭部
５ 凹部
６ マーキング[0001]
BACKGROUND OF THE INVENTION
The present invention relates to nails.
[0002]
[Prior art]
The head of the nail may be painted for the purpose of coloring or rust prevention. Such coating needs to improve adhesion so as not to be peeled off by an impact or the like when driving a nail.
Conventionally, in order to improve coating film adhesion, means for providing a large number of convex portions on the top surface of the nail head has been provided.
[0003]
[Problems to be solved by the invention]
However, when a convex portion is provided on the upper surface of the head, when the nail is driven through the head of the nail with a hammer, stress concentrates on the convex portion of the nail head, and the convex portion of the nail head is crushed. When the apex is crushed, there is a problem that the coating film on the surface is cracked and easily peeled off, and the coating film is scraped off by the friction of a hammer.
[0004]
[Means for Solving the Problems]
In the present invention, as means for solving the above-described conventional problems, 8 to 30 recesses 5 having a diameter of 0.1 mm to ¹ mm per upper surface area of 5 mm ² are provided on the upper surface of the head 3 , and further from the depth of the recesses 5. In addition, the nail 1 is provided in which a deep marking 6 is provided and the top surface of the head 3 is painted.
The inner surface of the recess 5, it is not to demand a curved surface.
[0005]
[Action]
In the present invention, since the concave portion 5 is provided on the upper surface of the head 3 of the nail 1, the upper surface of the head 3 of the nail 1 is flat. When the coating film 8 is formed on the upper surface of the nail head 3 as described above, the coating film 8 bites into the recess 5, and the adhesion of the coating film is enhanced by the anchor effect. When the inner surface of the concave portion 5 is curved, the inner area of the concave portion 5, that is, the contact area with the coating film 8 is enlarged, and the adhesion is further enhanced.
[0006]
The number of the recesses 5 is 8 or more and 30 or less per 5 mm ^{2 of the} nail head upper surface area, and the diameter of the recess 5 is 0.1 mm to ¹ mm.
When the number of the recesses 5 is less than 8 and the diameter of the recesses 5 exceeds 1 mm, the anchor effect due to the biting of the coating film 8 is insufficient, and when the recesses 5 are provided by punching, the punch is consumed. Also, when the number of the recesses 5 exceeds 30, and the diameter of the recesses 5 is less than 0.1 mm, the coating film 8 is not sufficiently bitten and the anchor effect is not remarkable.
[0007]
Further, since the marking 6 deeper than the recess 5 is provided on the upper surface of the nail head 3, the contact area between the upper surface of the head 3 and the coating film 8 is further expanded, and the coating film 8 in the marking 6 is Protected against direct hammer exposure.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described with reference to an embodiment shown in FIGS. 1 to 4. The nail 1 is composed of a pointed barrel portion 2 and a head portion 3, and a ring groove 4 is provided on the circumferential surface of the barrel portion 2. On the upper surface of the head 3, a plurality of concave portions 5 having an inner curved surface and a mark 6 as a marking are provided.
The recesses 5 are provided at a density of 8 or more and 30 or less per 5 mm ^{2 of the} nail head upper surface area, and the diameter of the recesses 5 is set to 0.1 mm to 1 mm and the depth is 30 to 80 μm. The recess 5 is preferably irregular and irregularly provided. When the recess 5 is irregular, the diameter refers to the longest diameter d as shown in FIG.
[0009]
Further the mark 6 is set deeper than the depth of the recess 5, in the present embodiment is set to about 150 [mu] m. Further, the area of the mark 6 is preferably about 10 to 20% of the area of the nail head flat portion 7. The mark 6 has various characters such as symbols, hiragana, kana, kanji, alphabet, etc., various shapes such as triangles, quadrangles, etc., as shown in FIGS. There is.
[0010]
Further, the area ratio (planar area / recessed area) of the flat part 7 other than the concave part 5 is desirably 1.0 or more, and it is desirable that the concave parts 5 are not in contact with each other as much as possible. It is desirable to set it to 30% or less per 5 mm ² , and more desirably 20% or less. The recess 5 and the mark 6 are formed by punching the upper surface of the nail head 3.
[0011]
The upper surface of the head 3 of the nail 1 is painted, and a coating film 8 is formed as shown in FIG.
As the resin for forming the coating film 8, a synthetic resin such as urethane resin, acrylic urethane resin, acrylic resin, acrylic silicone resin, fluororesin, silicone resin, olefin resin, and epoxy resin is used.
[0012]
In the nail of the present invention, the coating film peeling rate was measured when the head was struck by the function by changing the diameter of the recess 5, the number of recesses 5 per 5 mm ² , and the contact ratio between the recesses 5. The results are shown in Table 1.
[0013]
[Table 1]

[0014]
In Table 1, Comparative Example 1 in which the diameter of the concave portion 5 is 0.1 mm or less, the number of the concave portions 5 is 30 or more per 5 mm ² , the area ratio of the flat portion 7 is 10 or more, and the contact ratio between the concave portions 5 per 5 mm ^{2 is} 0%. Then, the coating film 8 peeling rate is 10 to 20% at the time of hitting 5 times of the ability, the diameter of the recess 5 is 1.3 mm or more, the number of the recesses 5 is ^{2 to} 3 per 5 mm ² , and the area ratio of the plane part 7 is 0. Although the diameter of Comparative example 2 and the recess 5 of the recess 5 mutual contact ratio of 0% per 3～0.5,5Mm ² is in the range of 0.1 to 0.8 mm, the number of recesses 5 is 5 mm ² per 4 In Comparative Example 3 in which the contact ratio between the concave portions 5 per 5 to 5 mm ^{2 is} 10 to 20% in Comparative Example 3 in which the area ratio of the flat portion 7 is 2.5 to 3.5 and 5 mm ² , the coating film 8 peel rate is 3 times There was 10-20%, the diameter of the recess 5 is 0.1 to 1.0 mm, the number of recesses 5 per 5 mm ² is 8 to 20, plane Although 7 is the area ratio 1.0 to 1.5, the comparison recess 5 mutual contact rate per 5 mm ² is 40-50% Example 4 coating films 8 peeling rate 5 at 5 times beating Gen'no 10%.
[0015]
【The invention's effect】
In the present invention, the adhesion of the coating film on the top surface of the nail head is remarkably improved, and even when the nail is driven, the coating film is hardly peeled off.
[Brief description of the drawings]
1 to 4 show an embodiment of the present invention.
FIG. 1 is a perspective view of a nail. FIG. 2 is an explanatory view of a recess. FIG. 3 is an explanatory view of a shape of a mark.
1 Nail 3 Head 5 Recess 6 Marking

Claims (2)

On the upper surface of the head, 8 to 30 recesses having a diameter of 0.1 mm to ¹ mm per upper surface area of 5 mm ² were provided , and further, markings deeper than the depth of the recesses were provided , and then the upper surface of the head was painted. Nail characterized by The nail according to claim 1, wherein an inner surface of the recess is curved.

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