JPS60106990A - Production of domed screen-like outside blade for electric razor - Google Patents

Abstract

PURPOSE:To obtain a titled domed screen-like outside blade by using a silicone pad for transfer printing in the stage of forming preliminarily a base metal into a dome shape then forming an electrical insulating film thereon thereby preventing exfoliation, damage, etc. of the electrical insulating film during the process for production. CONSTITUTION:A flat plate-shaped base metal is drawn to form a matrix 2 having a prescribed dome shape. An electrical insulating film 4 consisting of a resin 8 curable by UV rays is formed to the projecting surface of the matrix 2 in the part corresponding to the hair introducing holes 13 of a screen-like outside blade 12. The film 4 is formed by using a silicon pad 5 for transfer printing. The film 4 is then cured by irradiating UV rays 10 thereto and the matrix 2 having such film 4 is transferred into an electrodeposition cell, where the matrix is subjected to primary electrodeposition of a metal such as copper or the like to form a primary electrodeposition film 9 on the surface of the matrix 2 having no film 4. The surface of the layer 9 is then subjected to secondary electrodeposition of Ni, etc. to form a secondary electrodeposition layer 11 to serve as continuous ribs 14 between the holes 13 and 13 of the blade 12 on the surface of the stripping layer of the layer 9. The layer 11 is thereafter stripped from the layer 9 and the blade 12 having the holes 13 and the ribs 14 formed of a counter sink 15 on the bottom surface is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an improvement in a method for manufacturing a dome-shaped mesh outer cutter for an electric shaver by electroforming.

[Background technology]

Figure 2 shows the conventional process of manufacturing a dome-shaped mesh outer cutter by electroforming, in which the surface of a flat plate-shaped electroformed base material 1 is coated with ultraviolet rays as shown in Figure 2 (al). The resin 8 is applied uniformly, and then, as shown in FIG.

An electrical insulating film 4 is formed using a curable resin 8 (see FIG. 2 (
(See C1). The electroformed base material 1 on which the electrical insulating film 4 has been formed is drawn with a press to form a primary electrodeposited layer 9 having an approximately arcuate cross section on the surface not shown in Fig. 2 (di). A release layer is formed and peeled off on the surface of the power transmission coating layer 9 to form hair introduction holes 13 as shown in FIG.

A 1-convex mesh outer cutter 12 having a continuous lip 14 having an inverted cross section and surrounding a hair introduction hole 13 and having a countersink 15 formed on the lower surface is obtained.

The problem here is that after forming the electrical insulating film 4 on the flat base material 1, the base material 1 is drawn to form the dome-shaped matrix 2. That is, during this drawing process, the electrical insulating film 4 cannot be fully extended in areas where it stretches significantly, such as to the shoulders of the matrix 2, and as a result, the electrical insulating film 4 peels off in the corresponding bright areas.
Scratches, pinholes, etc. occur, which adversely affect the formation of the electrodeposited layer, resulting in a series of product defects.

[Purpose of the invention]

From this point of view, the present invention addresses peeling and scratching of the electrical insulating film during the manufacturing process of the dome-shaped mesh outer cutter.

The purpose is to eliminate defects such as pinholes.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized in that an electrically insulating film is formed after a base material is previously formed into a dome shape, and a silicon pad for transfer printing is used to form the electrically insulating film. .

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 3 to 6'.

First, a flat plate-shaped base material I (not shown in FIG. 3 (al) is prepared.

This is drawn as shown in FIG. 3 1b) to form a matrix 2 having a predetermined dome shape.

Next, as shown in FIG. 3 (Ql), an electrical insulating film 4 made of ultraviolet curable resin is applied to a portion (pattern) corresponding to the hair introduction holes I3 of the mesh outer cutter I2 on the convex surface of the electroforming matrix 2. To form this electrical insulating film 4, a silicone pad 5 for transfer printing is used, but as shown in FIG. Four parts 7 matching the pattern are formed by etching or the like, and the four parts 7 are filled with an ultraviolet curable resin 8, and a silicone pad 5 is pressed onto the intaglio 6 as shown in FIG. The resin 8 is placed on the silicone pad 5 (see Figure 6).Then, the ultraviolet curable resin 8 is transferred onto the convex surface of the electroforming mold 2 to form electrical insulation 19!4.At this time, the silicone If the band 5 is simply pressed onto the ultraviolet curable resin 8 on the intaglio 6, the ultraviolet curable resin 8 may not be sufficiently applied to the silicone band 5.Therefore, as shown in FIG. A silicone pad 5 with a built-in weak light source 10 and good translucency is prepared.
When pressed onto the ultraviolet curable resin 8 on the intaglio plate 6, the light source 10 is irradiated to semi-cure the area of the ζ ultraviolet curable resin 18 near the contact surface with the silicone pad 5.
1 Pick up the fat 8 onto the silicone pad 5. The surface of the ultraviolet curable JIH placed on the silicone pad 5 is a semi-cured layer as described above, but the lower layer is in an uncured state.

Therefore, in combination with the excellent transferability of the silicone pad 5, the ultraviolet curing resin 8 is reliably transferred to the surface of the electroforming mold 2 even if its surface is in a semi-hardened state. Particularly in this case, since the silicon pano 1:5 is semi-cured while being pressed, the surface precision of the silicone pad 5 appears on the surface of the ultraviolet curing resin 8 during turning, and the primary and secondary electrodeposition described later The daily surface area can be increased.

After this, the electrical insulating film 4 is cured by ultraviolet irradiation (the intensity of the ultraviolet rays is higher than that of the light source IO) in the same manner as in the conventional method, and the electroforming mother mold 2 on which the insulating film 4 is heated is heated. Transferred to a deposition bath, primary electrodeposition of metal such as copper is performed, and as shown in FIG. A primary electrodeposited layer 9 having a substantially arcuate cross section, for example, protruding from the surface, is immersed in a 1 m aqueous solution of sodium chromate or potassium dichromate.
Peeling 1iii (not shown) is formed on the surface of. Further, secondary electrodeposition of nickel or an alloy of nickel and cobal is performed to form a primary electrodeposition layer 9 as shown in FIG.
Hair introduction holes 13 and 13 of the mesh outer blade I2 are formed on the surface of the release layer of
A secondary electrodeposited layer 1 is formed to form continuous ribs 14 between the two electrodes. After this electroforming, if the electroforming matrix 2 is pulled up from the electrodeposition bath and the secondary electrodeposition layer 11 is peeled off from the primary electrodeposition layer 9, countersinking will occur on the lower surface of the hair introduction holes 13 and 7 as shown in FIG. 15
An I'-convex mesh-like outer cutter 12 having continuous ribs 14 between the hair introduction holes 13 and 13 formed therein is obtained.

As the ultraviolet curing resin 8 of the electrical insulating film 4.

Unsaturated polyester resin or thiol olefin 411 resin is preferred. What about ultraviolet curable resin? It may be a 12-son beam curable resin.

〔Effect of the invention〕

According to the method of the present invention as described above, after the electroforming matrix 2 is formed into a dome shape, the electrically insulating crotches 4 are formed on the convex surface of the matrix 2 using ultraviolet or electron beam curable resin. , unlike the conventional method in which an electrical insulating film 4 is formed on a flat base material 1 and then drawn into a dome shape, the electrical insulating film 4 is
Peels off and scratches.

The occurrence of pinball etc. can be completely eliminated. Also.

Since the silicon pad 5 for transfer printing is used to form the electrical insulating film 4, there is an advantage that even if the surface of the electroforming mold 2 has a convex curve, the electrical insulating film 4 can be easily and reliably transferred thereto. .

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a typical dome-shaped mesh outer cutter in an electric shaver. Figures 2 and 1 are cross-sectional views sequentially showing the manufacturing process of a conventional dome-shaped mesh outer cutter. 3 to 6 show an embodiment of the method of the present invention, and FIG. 5 is a sectional view of an intaglio plate used to carry out the method of the invention. FIG. Figure 6 is a cross-sectional view of the ultraviolet curable resin picked up on a silicone pad for transfer printing. ■... Electroforming base material. 2... Electroforming base mold. 4... Electricity. Insulating film. 5... Silicone pad for transfer printing. 8... Ultraviolet or electron beam curable resin. 9... - Molding deposited layer. 11... Secondary electrodeposition layer. 12...・Mesh-like outer blade. 13... Hair introduction hole. 14... Continuous rib. Figure 4 Figure 5 Figure 6 Figure 3 (a) Figure 3 (b) Figure 3 (C)

Claims (1)

[Claims] (11) Steps of forming a flat electroforming matrix 1 into a dome shape to form a dome-shaped electroforming matrix 2, and forming a mesh pattern on the convex surface of the electroforming matrix 2. A process of forming an electrically insulating film 4 of ultraviolet or electron beam curable resin 8 on a portion corresponding to the hair introduction hole 13 of the outer blade 12 using a silicone pad 5 for transfer printing, and a step of forming an electrically insulating film 4 of the electroforming mold 2 The step of forming a primary electrodeposited layer 9 on the surface not covered with the electrodeposited layer 9 and the surface of the electrodeposited layer 9. The peeling treatment was also performed on the 11-hole outer blade 1 by secondary electrodeposition.
Steps of forming a dish-shaped secondary electrodeposition layer 11 that becomes continuous ribs 14 between the hair introduction holes 13 and 13 of No. 2;
It consists of a step of peeling off the iill. A method for manufacturing a dome-shaped mesh outer blade for an electric razor.