CS204698B1 - Method of making the protective tyre inserts - Google Patents

Description

The present invention relates to a method for the preparation and manufacture of tire liners reinforced in the region of a valve bore and provided with a metal ring preventing the liner from being forced and thus also through the bore.

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The liner is used in tires to protect the inner tube against damage from the rim. They are shaped and structurally adapted for use in car tires of different manufacturers and different designs. Two methods for the preparation and manufacture of pads are currently known. In one, a rectangular cross-section profile is embossed on an extruder, and is inserted into the vulcanizing block of the press as a weighted amount according to individual dimensions and conversion. Said method of preparation is dependent on the method of vulcanization in a mechanical press, where, when using a three-part block, the batch is inserted into the lower part of the block in the closed position is pressed to the final shape of the protective insert and removed after pressing. In another method, which is also given by a vulcanizing press, the so-called lisostrik aa, when using a three-piece molding unit, presses the mixture into the molding unit and presses it into the final shape of the pad in the closed position. The previously described methods for the preparation and manufacture of pads have shown these reduced durability since the action of the metal valve has caused tearing in the area of the valve opening. To this end, the molded pads were provided with taxile reinforcement in the region of the valve opening and a metal ring was inserted into the opening. thus

204 698

The 204 B9ff pad was then re-flowed.

A disadvantage of the above methods of preparation and manufacture of pads is that the prior art vulcanizing lines did not make it possible to prepare pads and textile reinforcement and metal ring at the valve opening, and this had to be subsequently carried out manually on the molded pad at low labor productivity. The additional overpressing of the liner has reduced its physical-mechanical properties. The relatively long vulcanization cycle associated with pre-casting has a considerable effect on the deterioration of the energy situation. The protective inserts after molding exhibit protocols which aa must be removed in a non-productive manner.

These disadvantages are overcome by the method of preparation and manufacture of tire protective inserts according to the invention, which is characterized in that the profile of the finished protective insert is identical to the diameter of the ejected rubber for rubber-rubber mixture, the end parts of which are bevelled at an angle instead, the textile reinforcement is provided in which a metal ring is inserted after the hole for the rainbow valve has been punched out and the protective insert thus provided is poured.

An advantage of the method according to the invention is that the preparation of the raw protective insert, including the textile reinforcement and the insertion of the metal ring into the hole for the valve of the aa, is carried out before the vulcanization itself. The molded profile in the form of a finished protective liner and its subsequent pressing in a molding press by means of a vulcanizing membrane and a one-piece block prevents the formation of overflows. The vulcanization cycle is considerably shortened, labor productivity is improved and the physico-mechanical properties of the molded pads are improved. The vulcanization itself is carried out by means of a vulcanizing press for which protection is required in a separate application of the invention. and

An endless belt of the insert is sprayed on the attrition device, the cross-section of which is given by the profile of the final shape of the insert, the belt and a cut into lengths given by the circumferential wrapping of the vulcanizing block. The edge portions are bevelled at an angle and, after folding and cementing the edges, they are glued and rolled in order to increase joint cohesion. A textile reinforcement is carried out at the joint, which in addition to preventing the insertion of the liner and hence the core through the hole for the valve of the tube will perform the function of raising

Even the strength of the joint. In the center of the reinforcement aa, a hole for the valve of the rainbow is punched into which a metal ring is inserted into the germ. The thus prepared protective insert aa is pressed onto the one-piece block and pressed.

Claims (1)

2 204 B9ff, the provided pad was then overlapped. The disadvantage of the aforementioned methods of preparation and manufacture of protective pads is that the prior art vulcanization molds did not allow for the preparation of protective pads and textile reinforcements and metal rings at the opening of the tube valve and subsequently to transfer the latter self-manually to the molded protective liner at a low product. -you work. The additional compression of the pad reduces its physical-mechanical properties. The relatively long vulcanization cycle associated with prewashing has a considerable impact on the energetic situation. The inserts after extrusion exhibit spindles that self-remove in a non-productive manner. The above drawbacks are obviated by the preparation and manufacture of tire protection pads according to the invention, the principle being that the profile of the finished pad is identical to the rubber band of the rubber-rubber blend that ends at an angle to the end of the rubber plug. the joint is carried out by a textile reinforcement to which a metal ring is inserted into and out of the opening for the valve of the inner tube, and the protective liner thus provided is absorbed. It is an advantage of the method of the invention that the preparation of the raw protective liner, including the textile reinforcement and the insertion of the metal ring into the orifice for the valve valve, and pass before the vulcanization itself. The extruded profile in the form of a finished protective liner and the consequent pressing in the molding press by means of a vulcanizing membrane and one-piece block prevents the formation of overflows. It is essential to shorten the vulcanization cycle, increase the productivity of the work and improve the physico-mechanical properties of the molded protective liners. The vulcanization itself is carried out by means of a vulcanizing press, which is the desired protection in a separate application. On the spray device, an endless belt of the protective liner is sprayed, which cross-section is given by the profile of the final shape of the protective liner, and this belt aa splits the shafts given by the circumferential wrap of the vulcanizing block. The edge portions which are beveled at the angle after burring and cementing the margins are glued and sealed to increase bond strength and adhesion. A strong reinforcement is provided at the point of connection, which, in addition to preventing the insert from being pushed through, and thus the tube through the orifice for the valve valve, will perform the function of increasing the bond strength. At the center of the reinforcement aa hole of the breast is punched out by a valve of the tube into which the insert ring is inserted. The protective liner thus prepared aa presses the mold into one piece and is molded. «. The method of embedding protective tire inserts provided with a textile reinforcement and a metal ring in the region of the valve opening, characterized in that the profile of the finished protective liner is identical and the cross-section of the sprayed strip of rubber rubber blend that end portions are. the angle tapered, the flange after joining is made in the textile joint by a reinforcement, into which a metal ring is inserted after the opening of the valve opening and the thus provided protective insert is inserted. vyliauje. . <