Plastic article or earthenware shaping or treating: apparatus – Dipping type shaping means – Mounted on moving support
Patent
1996-11-27
2000-02-29
Timm, Catherine
Plastic article or earthenware shaping or treating: apparatus
Dipping type shaping means
Mounted on moving support
425275, 425436RM, 264 39, 264301, 264303, 264304, 264305, B28B 704, B28B 138
Patent
active
060302011
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process and a device for producing a prophylactic from thin-walled elastic material (latex). In particular, the invention deals with a possible device for producing the prophylactic according to the process defined according to claim 1.
Such processes and devices for producing thin-walled molded bodies particularly from natural rubber compounds are known in the state of the art. In connection with the known processes for producing a prophylactic, usually one or two immersion stages are involved, whereby the immersion tool, which, as a rule, can be manufactured from polished metal, porcelain, wood or glass, is slowly immersed with its total immersion length in an immersion tub filled with a latex mixture, and slowly pulled out again. A drying stage takes place between the first immersion stage and the second immersion stage in that the water present on the immersion tool and on the applied elastic material is removed by evaporation.
Without entering into each individual process step of the known process, it is impossible with such a process to produce from one and the same elastic material a prophylactic with an elastic ring according to the invention that satisfies the requirements specified by the health authorities with respect to a prophylactic for preventing conception or for protection against infectious diseases.
With the processes and devices known in the state of the art, it is possible to produce multiple rings enclosing the top part of the prophylactic; however, not an individual ring having multiple times the mass of the rings known in the state of the art.
Another form of a prophylactic known in the state of the art is described in published document UK-1,142,443. This is a prophylactic having in the upper closed part a certain contour in the longitudinal cross section, which contour is adapted to the anatomical form of the male member. The drawback with said anatomical form is the fact that even though the anatomical form is given, no point of support is present along the inside wall of the prophylactic that provides the latter with a safe and comfortable support.
Furthermore, with the immersion production processes known in the state of the art, it is impossible to produce a multicolored prophylactic to which the color does not have to be applied to the outer surface of the prophylactic in a later work step, which finally represents an annoying factor when it is used.
Therefore, the problem of the present invention is to make available a prophylactic which, in the front part, has a ring made of elastic material, and which, if need be, can be produced multicolored, whereby the prophylactic is flawless in the material and conforming to the requirements of the testing authorities.
According to the invention, said problem is solved by the characterizing features contained in the main claims.
According to the introductory part of the process according to the invention, said process is characterized in that the immersion tool, with more than one immersion stage, is immersed in the liquid elastic material to be applied with different depths, whereby it is decisively important that the first immersion depth is substantially shorter than the subsequent immersion depths, and that after each immersion stage, a heat treatment of the immersion tool with the applied elastic material (latex) takes place.
The device according to the invention, such device belonging to the process of the invention for producing a prophylactic, is substantially characterized in that it has three immersion tubs, in which a special mixture (latex) substantially consisting of natural rubber is present, whereby the first of the three immersion tubs is, relative to the endless conveyor belt, disposed substantially lower than the two other immersion tubs, and provision is made for drying furnaces, such a furnace being arranged between the first and the second immersion tub and between the second and the third immersion tub, such furnaces being assigned a certain temperature profile and temperature program,
REFERENCES:
patent: 1923733 (1933-08-01), Killian
patent: 2021299 (1935-11-01), Gammeter
patent: 5323544 (1994-06-01), Osgood
Mason Suzanne E.
Timm Catherine
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