CH309274A - Method of manufacturing a molded plastic article provided with signs and article obtained by means of this method. - Google Patents

Description

Process for manufacturing a molded plastic article provided with signs and article obtained by means of this process.

The present invention comprises a method of manufacturing a molded plastic article provided with signs and an article obtained by means of this method.

The method according to the invention is characterized by the fact that there is placed in the mould, before molding, signs intended to be at least partially embedded in the plastic material.

The article according to the invention is earaeterized by the fact that it is made of plastic material and presents at least partially new signs in this material.

The appended drawing illustrates, by way of example, two embodiments of the method comprising the invention, method applied to the manufacture of watch dials.

Wire-. 1 to 3 are sections of the tool] age employed during the first form of implementation.

Fig'. 4 is a section of the tools used in the second form of implementation.

The oiitillage emplov during the first form of implementation comprises a mold (FIV. 1 a. 3) having a base 1 in the form of a wedge, the side walls of which present an interior shoulder 1 & iormant seat for a closure plate 2 of the mould. This plate has a rim l. ate ral? cr, against which rest fixing screws 3. Plate 2 is pierced with a hole 4 through which plastic material is intended to be injected inside the mould.

The mold described is used as follows: The plate 2 occupying the position represented in FIG. 1, we inject a first eouehe plastic material 5, then. remove the plate 2 and place on this first layer of plastic material time signs 6 made of metal, synthetic stone or any other material. The plate 2 is then replaced, but turning it over (FIG. 3), and a second layer of plastic material designated by 5a is injected. The time signs 6 are coated in this layer 5a and are thus embedded in the thickness of the finished dial, which includes the two layers 5 and 5a.

In the second form of implementation (fig. 4), the closing plate of the mold, 7, has, on its inner face, erodes 8 in which are placed time signs S which thus partially project out of the plate. 7. The latter is pierced with an injection hole 10. Plastic material 11 is injected into the mould, a material which partially coats the signs 9. After dismantling, the parts of the signs which were lodged in the 8 protrude from the dial.

It will be possible, by this process, to manufacture not only watch faces, but gear frames bearing towers. easels for the exhibition of objects bearing marks or inscriptions, the signs being able to consist of drawings, letters or cyphers, even lids of caskets, also provided with inscriptions, panels, etc.

CLAIMS: I. Process for the manufacture of an artiele in molded plastic material provided with signs, charac- terized by the fact that there is placed in the mould, before molding, signs intended to be at least partially embedded in the plastic material.

II. Artiele obtained by means of the process according to Claim I, marked by the fact that it is made of plastic material and shows signs at least partially embedded in this material.

SUB-CLAIMS: 1. Process according to Claim I, charac- terized by the fact that plastic material is injected into the mold in which the signs are arranged.

). Method according to claim 1 and sub-claim 1, characterized in that the signs are placed in practical housings in one of the walls of the mould, these si ynes protruding inside the mould, so that the part protruding is embedded in the plastic material and that the part housed in the wall of the mold protrudes on the surface of 1'article once this clernier de- mold.

3. Process according to claim I and sub-claim 1, characterized by the fact that the molding is carried out in two excessively heavy stages, the first stage being that in which a plate constituting part of the article is molded, then signs are placed on the surface of said plate, then in the second stage a second plate is molded on the first, this second plate coating the signs which are thus completely embedded in the plastic material.

**WARNUNG** Ende DESC Feld konnte Anfang CLMS uberlappen**.

Claims (3)

WARNUNG* Anfang CLMS Feld konnte Ende DESC uberlappen *. both marks or inscriptions, the signs being able to be constituted by drawings, letters or cyphers, even lids of boxes, also provided with inscriptions, signs, etc. CLAIMS: I. Process for the manufacture of an artiele in molded plastic material provided with signs, charac- terized by the fact that there is placed in the mould, before molding, signs intended to be at least partially embedded in the plastic material. II. Artiele obtained by means of the process according to Claim I, marked by the fact that it is made of plastic material and shows signs at least partially embedded in this material. SUB-CLAIMS: 1. Process according to Claim I, charac- terized by the fact that plastic material is injected into the mold in which the signs are arranged. ). Method according to claim 1 and sub-claim 1, characterized in that the signs are placed in practical housings in one of the walls of the mould, these si ynes protruding inside the mould, so that the part protruding is embedded in the plastic material and that the part housed in the wall of the mold protrudes on the surface of 1'article once this clernier de- mold. 3. Process according to claim I and sub-claim 1, characterized by the fact that the molding is carried out in two excessively heavy stages, the first stage being that in which a plate constituting part of the article is molded, then signs are placed on the surface of said plate, then in the second stage a second plate is molded on the first, this second plate coating the signs which are thus completely embedded in the plastic material.