JP3023576U - Protective cap - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an inexpensive and lightweight protective cap. A protective cap has an outer surface of a cap body formed by foam-molding a thermoplastic resin, and a skin layer integrally formed by heating the outer surface to a thermal deformation temperature or higher and then curing the outer surface.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a protective cap used in various industrial fields and everyday life.

[0002]

[Prior art]

 Conventionally, as a head protection cap used, as shown in FIG. 3, a cap body 51, which is the main body of the protection cap, having a flexible liner 52 stretched inside is used. A locking tool (not shown) including a pad for mounting on the head and a band for tightening is provided inside the liner. As the material of the cap body 51, a plastic molded product made of glass fiber polyester (FRP), polycarbonate (PC), polyethylene (PE), polypropylene (PP), acrylonitrile butadiene styrene (ABS), etc. is used. . The liner 52 is made of Styrofoam foamed 20 to 30 times.

[0003]

[Problems to be solved by the device]

 In the conventional protective cap, two types of parts, that is, the cap body portion 51 and the liner 52, are manufactured by different processes using different materials, and after the production, the liner 52 is adhered to the cap body portion 51. It is necessary to fix it by means of tension. In other words, the manufacturing cost of this protective cap is high because of the number of man-hours, and it is relatively heavy. The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above problems, and to provide a relatively light protective cap that is easy to manufacture.

[0004]

[Means for Solving the Problems]

 In accordance with the above-mentioned object, the present invention has a protective layer on the outer surface of a cap body formed by foaming a thermoplastic resin, which has a skin layer integrally formed by heating the outer surface to a temperature higher than the heat deformation temperature and then curing the outer surface. The above problem was solved by using a hat. In addition, the present invention is applied to the outer surface of a cap body formed by foam molding using polystyrene, polypropylene, or a copolymer of polystyrene and polyethylene. The above problem was solved by using a protective cap having a formed skin layer.

[0005]

[Embodiment of device]

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cross section of a cap body serving as a protective cap, 11 is a cap body portion, and 12 is a liner portion. A thermoplastic material such as polystyrene (PS) or polypropylene (PP), or a copolymer of polystyrene (PS) and polyethylene (PE) is used for the cap body portion 11 and the liner portion 12. Using foamed beads of this material, a hemispherical foam molded body 1 having the same shape as the cap body and a slightly thicker hemispherical shape is formed as shown in FIG. 2 so as to obtain a foamed body having a foaming ratio of 15 to 30 times. . The reason why the expansion ratio is set to 15 to 30 times is that this range is most preferable in terms of wearing feeling and protection on the human head.

Next, a molding die having the same shape as the outer shape of the cap body 11, that is, a molding made of a material having a smaller linear expansion coefficient than the plastic material, for example, aluminum, copper, steel, or an alloy material thereof. A mold is prepared, and the mold is heated to a temperature not lower than the thermal deformation temperature (molecular orientation temperature) of the plastic material, and the outer surface of the foam molded body 1 is brought into contact with the mold, and an appropriate pressure is applied. In addition, release the mold after holding the required time. That is, the surface of the foamed molded body 1 in contact with the molding die is in a softened and melted state, and may be released after cooling. As a result, the cap body portion 11 made of a hard skin layer is obtained on the outer surface of the foamed molded body 1, and the inner portion of the foamed molded body 1 which does not cure constitutes the liner portion 12. Therefore, a hat body in which the hat body portion 11 made of the skin layer and the liner portion 12 are integrated is formed. The thickness of the skin layer is appropriately adjusted by the time and pressure for contacting the foamed molded body 1 with the mold. The molding of the foamed molded body 1 and the formation of the skin layer can be performed by a series of continuous operations. It should be noted that the present invention is not limited to the above-mentioned embodiment, and the skin layer may be formed by curing the outer surface of the foamed molded product by another mode, for example, by a method other than the manufacturing method.

[0007]

[Effect of device]

 The protective cap according to the present invention is very light because it uses a foamed molded product, and is strong because the outer surface is integrally formed with a hard skin layer, and is resistant to scratches and dirt. Further, unlike the conventional case, it is not necessary to separately manufacture the cap body portion and the liner portion, and thus it can be inexpensively produced as an integrated product. Therefore, it is suitable as a simple and secondary protective cap.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an outline of a cap body of a protective cap according to the present invention.

FIG. 2 is an explanatory cross-sectional view of a foamed molded product before forming a cured skin layer on the surface of the cap body.

FIG. 3 is an explanatory view showing a cross section of a conventional protective cap, omitting interior parts.

[Explanation of symbols]

 1 Foam molded product 11 Cap body part 12 Liner part

Claims (2)

[Scope of utility model registration request] 1. A protective layer comprising a cap body formed by foaming a thermoplastic resin, and having a skin layer integrally formed on the outer surface of the cap body by heating the outer surface to a temperature higher than a heat deformation temperature and then curing the outer surface. Hat. 2. Polystyrene or polypropylene,
Alternatively, the outer surface of the cap body formed by foaming and molding using a copolymer of polystyrene and polyethylene has a skin layer integrally formed by heating the outer surface to a temperature higher than a heat distortion temperature and then curing the outer surface. A protective cap.