AT503683B1 - IN THE INJECTION MOLDING OR PRESSING METHOD MANUFACTURED SHAPE - Google Patents

Description

2 AT 503 683 B1

The invention relates to moldings produced by injection molding or pressing from plastically deformable material, namely thermoplastics, biomass or sinterable art-stoffhältigem material.

It has already been proposed, in discarded or collected old parts, here usually in such old parts made of thermoplastic material to cause recycling that this material is crushed and added to the material used here as a filler in the new production.

In the production of composite parts of a material of the type mentioned above and a silicone, it often comes thereby to difficulties that the latter material does not adhere sufficiently to the molding. One way to go was to develop a good-adhesion silicone. A corresponding material was found, but it can be much worse process compared to the normal silicone, since it can be removed from the mold with difficulty because of its good adhesion even in the vulcanized state and also tends to be the most commonly used for such materials in the injection molding needle-like Nozzles that may have small cannula cross sections to glue. Another proposed solution provides to spray the moldings of a material of the type mentioned above before attaching the supplementary parts with an adhesive which may be a good-adhesion silicone or an elastomer, and then spray the actual supplementary parts. This requires at least one extra operation in production and may also contribute to contamination of the delicate molds.

In the production of elastic molded parts made of rubber, it is known from EP 1 074 659 A2 to use mats of unvulcanized rubber material as mutual cover layers for an insert of smaller elastic parts, these z. As the chip-like plastic parts are impregnated with a thermosetting resin and inserted between the rubber mats, after which the latter vulcanized by heating and cured by the heat, the resin, so that a finished composite part is created, which can be used for example as a cushion insert under traffic areas.

DE 26 16 309 A1 provides a production method in which the first part of a composite body is pretreated in a differently heated form in such a way that only the part not touched by the subsequent composite body hardens, but the connection part still remains semi-liquid as a gel and then There, the second part of the composite body is molded so that its material with the gel enters a reaction and is finally heated to the form-holding.

DE 33 24 204 A1 provides a similar procedure for the preparation of a composite of two different properties having polymers. For this purpose, the first polymer in the mold is only heated to the extent that there is no cross-linking, but if possible given sufficient shape retention, after which the second polymer injected, is reacted with the first and finally by heating the cross-linking of both materials is brought about.

In the processing of silicone, there are so far undesirable by-products. The material is usually delivered in barrels and pumped by them in temporary storage and then in the respective processing machines, in particular injection molding machines. Especially in the barrels remain residues of the silicone material, which are no longer suitable due to the storage and the access of air in their consistency for the production of appropriate moldings.

The object of the invention is to seek suitable ways to eliminate the difficulties indicated in the manufacture of composite parts. A sub-task consists of reasonable utilization possibilities for the direct processing in injection molding as described above.

Claims (1)

3 AT 503 683 B1 casting machines no longer suitable silicone material to find. The invention consists in principle that in moldings of the type mentioned the plastically moldable material is added to a filler itself at least partially made of silicone, so this if necessary as a primer for bonding a molding to a composite body complementary part or portion made of silicone material. The filler used may be fresh silicones, but in some cases also recycled materials. This then also allows the use of silicones that are no longer fully sprayable, as described above. Pre-vulcanized silicones can also be used. The amount of silicone added depends on the one hand on the desired effect as a primer and of course on the requirements of the particular molded part in terms of strength, color and durability. In any case, the material properties of the supplementary part must also be considered. In the various applications, the silicone can be added to the material for the molded part before the deformation process or during the molding process. The molded part remains surprisingly adhesive, so that an additional part can also be injected later. Another effect results from the fact that if no adhesion promotion is needed for a supplementary part, a valuable use for silicone material is achieved, which was otherwise unusable for the reasons stated above. In the drawing, the embodiment is shown as a simple molded part with a supplementary part. The example, a round outer shape with a closure plate 2 having molding 1, is prepared in the manner mentioned in the respective material mixture with the silicone as a filler by injection molding or pressing. Subsequently, a ring 3 made of an elastomer or silicone is sprayed onto the end plate 2, which firmly adheres to the end plate 2 because of the adhesion promoter formed in the end plate 2 by the silicone without any other measures. Claim: In the injection molding or pressing manufacturable molding of plastically deformable material, namely thermoplastics, biomass or sinterable, kunststoffhältigem material, characterized in that the plastically moldable material is added to a filler itself at least partially made of silicone, so this if necessary serves as a bonding agent for the connection of a part (3) or partial region of silicone material which supplements the molded part (1) to form a composite body. For this purpose 1 sheet of drawings