JPS6357042B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing electrostatic shoes that releases static electricity charged on a human body to the ground.

(Prior art) Conventional electrostatic shoes use a conductive rubber outsole, and in order to electrically connect this outsole to the sole of the foot, metal studs penetrate the insole or conductive rubber insole is used to electrically connect the outsole to the sole of the foot. A method using a core (Utility Model Publication No. 58-26561) has been proposed.

(Problem to be solved by the invention) However, these electrostatic shoes require special metal studs and cores to be manufactured and attached separately, which inevitably requires additional manufacturing steps and increases costs. Ta.

The present invention does not require many extra parts or manufacturing processes unlike the conventional electrostatic shoes, and the upper surface of the midsole communicates with the outsole by simply forming the outsole by injection molding. The aim is to form a film using a conductive synthetic resin.

(Means and effects for solving the problems) For this reason, the present invention has the advantage of bending and sewing the edge of the upper to the circumferential side of the insole, and making a resin material by injection or extrusion molding on the lower surface of the insole. In a method of manufacturing shoes in which the outsole is molded, a conductive synthetic resin is injected into the space where the outsole is formed by upper and lower molds to form the outsole, and the injection pressure is maintained. By doing so, the conductive synthetic resin oozes out from the seam between the upper and the midsole onto the upper surface of the midsole, and a film of the conductive synthetic resin is formed on the upper surface of the midsole.

(Example) Examples of the present invention will be described below with reference to the drawings. 1 is an outsole, 2 is an insole, and 3 is an upper leather. The outsole is made of conductive synthetic resin (mainly polyurethane), a material specially formulated for the outsole with a volume resistivity of approximately 10 ⁹ Ω・cm. According to the JIST8103 test method, the resistance value of soles made of this material is approximately 1.0 x 10 ⁵ to 1.0 x 10 ⁷ Ω, which is an ideal value for the performance of electrostatic shoes. Ta.

4 is a seam such as matsukei stitch or other lock stitch stitch, and seam 4 is formed by folding the edge 5 of the upper to the circumferential side of the midsole 2 from below and sewing the overlapped part of both with a thread. It is something to do. The insole 2 and upper 3 are now integrated, and this is mounted in a mold 6 as shown in FIG. 3, and the outsole 1 is formed by injection molding. In this case, there is another mold 7 between the upper 3 and the midsole 2.
is inserted, and a space 8 corresponding to the thickness of the outsole 1 is formed by a mold 6 on the lower surface of the midsole 2 supported from above by this mold.

In this state, conductive synthetic resin is injected and filled into the space 8 using an injection molding machine or an extruder according to a known method. In this state, the synthetic resin fills the space 8 and also seeps into the seam 4, but if this filling pressure is maintained, the resin liquid passes through the seam 4 and seeps out onto the upper surface of the insole 2. However, it eventually flows out from around the midsole 2 into the gap (previously provided) between the mold 7 and the midsole 2, and finally forms a film 9 on the entire upper surface of the midsole 2. In this state, the mold is appropriately cooled and after the resin has solidified, the molds 6 and 7 are removed, and the state shown in the cross section of FIG.
An electrostatic shoe is obtained in which the film 9 is formed on the upper surface of the midsole 2 and is electrically conductive through the resin that has oozed out. When you wear these shoes, the static electricity charged on your body is transferred from the wide area of the sole of your foot to the outer sole 1 through the membrane 9 and the resin at the seam 4.
and is discharged to the ground.

(Effects of the Invention) The present invention is constructed as described above in detail, and when the outsole made of a conductive synthetic resin is molded by injection or extrusion molding, the edge of the upper is attached to the circumferential side of the midsole. The synthetic resin liquid oozes out and flows out onto the upper surface of the midsole at the seam when the material is bent and sewn, forming a film on the upper surface of the midsole. This film is not created in a separate process, but is formed naturally by simply maintaining the pressure during injection or extrusion molding of the outsole, so there is no particular cost increase.
In this case, in the present invention, the outsole is molded by injecting or extruding resin into the space formed by the upper and lower molds for molding the outsole, so that the pressure during injection or extrusion molding of the outsole is reduced. Since the space is sealed, retention can be easily and reliably achieved, and by forcibly exuding the resin under pressure, the objective can be achieved in an extremely short time compared to when the resin is allowed to seep in naturally. can improve shoe manufacturing efficiency. In addition, since this film is formed on the entire or most part of the upper surface of the insole, it has a large contact area with the sole of the foot, and can quickly and reliably dissipate electrical charges from the human body through the resin in the seams on the outsole. can.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of an electrostatic shoe showing an embodiment of the present invention, FIG. 2 is a front sectional view of the same, and FIG. 3 is an explanatory diagram of a method of forming an outsole. Explanation of the main parts of the figure, 1... Outsole, 2... Insole, 3... Upper, 4... Seam, 5... Edge of upper, 6, 7... Mold, 8... ...Space, 9...Membrane.

Claims (1)

[Claims] 1. In a method of manufacturing shoes in which the edge of the upper is bent and sewn to the circumferential side of the midsole, and a resin outsole is molded on the underside of the midsole by injection or extrusion, the upper and lower molds are The outsole is formed by injecting or extruding a conductive synthetic resin into the space formed by the outsole, and by maintaining this injection or extrusion pressure, the conductive synthetic resin is molded into the upper. A method for producing electrostatic shoes, characterized in that a film made of conductive synthetic resin is formed on the upper surface of the insole by oozing out onto the upper surface of the insole from a seam where the conductive synthetic resin and the insole are sewn together.