DE1729633A1 - Process for the manufacture of pneumatic tires - Google Patents

Description

7erfahr <no ^: ir manufacture of pneumatic tires "

The invention relates to a method for the division of
Pneumatic tires, whereby a tire body is built up from Kr.rdlagen and receives a tread strip, and v / o during the final ii-vulcanization of the tread strip its tread strip profile is formed. One useful application is found in the learning of pneumatic tires for the vehicle radar of heavy goods vehicles, tractors or earthmoving machines. Here, the term lieifen have stripes, whose circumferential JMUcLe aurjgepriigton with a tread profile, is aum r plurality vori gripping atolls provided.

109826/0217

The tread profile is formed in the outer circumference of the tire contact strip by means of the inner surface of the vulcanizing mold, which is appropriately profiled. During the vulcanization process, the unvulcanized elastomeric material of the tread is pressed into the profiled inner surface of the vulcanized mold and, up to a C ^Q , degrees into the cavities of this profiling know where the desired final tread profile is created , see B. Such a displacement of the cord layers of the tire body assumes particular dimensions when, for example, tractor tires or soaps are vulcanized by ground-moving devices that have tire treads, because with them the tread compound dissolves to a considerable extent during the vulcanization process and the cord layers of the tire body are also in the process relocate to a relatively large extent,

X "

Bern method according to the invention is based on the object when vulcanizing such tires, the yielding T of the cords and other skins of the tire body in the case of ι

109821/6117

Prevent molding and vulcanization of the tread.

According to the invention this is achieved in that before final molding and vulcanization of the tire, the tire body is subjected to pre-vulcanization. For example the process is carried out so that one. a tire body made of unvullianized rubberized cord layers with or without an unvulcanized tread made of elastomeric material that you can get the tire body into its essentially final desired shape deformed and thereby at least partially vulcanized, that one in the F-IIe that the tread is not already on the tire body was placed, an unvulcanized tread made of elastomeric material on the molded and at least partially Talicanised heather body is applied, and that the barrel is vulcanized onto the body of the heat.

Preferably, the tire body is in contact with the tread during molding and curing a thermally conductive body kept at a temperature below the vulcanization temperature of the tread, in order to essentially over-vulcanize the To prevent tire body. The term "tire body"

109826/0217

here includes all parts ₁ from which the tire is built with the exception of the tire tread, i.e. the carcass layers, the inner rubber lining! the Öürtellagen, the side rubber, the bead cores, the WuIetUmlagen and the like.

In one embodiment of the method according to the invention becomes the radially outer circumferential surface of the at least partially vulcanized tire by a rasp or burst

gear open roughened i _t l># f0 |? 4tö? Jfetffrtipplf · & is placed on the tape

placed ^f tire body "that the formed and at least :: '- partial vulltattaierte tire body in between we sent Iichen mutually parallel side members including

that the tread is placed on the radially outer peripheral surface of the tire body between these side members _f and that the tread is formed and vulcanized between the members and a number of displaceable mold segments applied to the radially outer peripheral surface of the tread.

As an alternative to this procedure, the complete built-up, unvulcanized tires vulcanized in two stages. In the first stage, the .tire body of the

109828/0217

unvulcanized tire at least partially vulcanized, by heating it in a form which has a smooth con- door in the area of the strip, i.e. that of the soap is not provided with a tread pattern. In the second stage, it is advisable to use a tread vulcanizing ring of the type used for the soling of tires with a profile nega tive is provided for the formation of the tread profile, the tread and, if necessary, the partial vulcanized tire body is heated to the whole tire vulcanize completely. line over-vulcanization of Sharing n & s tires can be avoided by

+ oven area is cooled during the first stage and / or during the second stage. Bin convenient method for cooling is that a coolant, cold urasner or air wlrmeleitenden by a suitably shaped body is passed, for example, the filing in contact with the corresponding 'or parts d * s is the tire and of the L' yi-frni 'is kept at a temperature below the vulcanization temperature.

An aur; .f'tihrimg3forifl of the invention is going into detail described.

109828/0217

BATH

In this form of implementation, what is used according to the invention Method of making a rear wheel tire for a tractor. The tread of the tire should be large traction-transmitting profile be provided, the a plurality of preferably approximately V-shaped gripping pins.

The tire body wirä VIn; ■ h ^ Äta icher Weis * ί »sylindriscjiej? ^ tstalt on a ^ R ^

contains the usual ^ '--.-. WttlA ^^^^ y · ■ Wujiii ^ ip ^ i! · ^ -. ViAd "- ^ ιβΛί ^ ϊϊ **!",.; Carcass plies, fce "fitre" Wfl $ ^

Br is from the on ^ au ^ id ^^

aiple ^ eea ·. fi ^^^ eMgipigl; ^: Gt # | ^ | e ^ p || ^ p

Tire body in eggÄem in front of ^ |; ii ^ siöpett ^^ i »# and haii the desired torroidal Gesf (i || * The ^ catching surface of the tire body is ilm wes ^ tttlic ^ e ^ i ^; siatljes Aus ^ eh ^ n | - |% e ^ s: ^iv:;. || ^^ i | i ^^ ^^^^ _see: Obe ^ ^ rfIa _(height of the ReiletöS ^ s ^ iif ^^

unites' totihbifri ^ y: ^? ¹⁰ ^! ^^^^! * - w ^ f _: ^ W * wisci ^ n / v ;; ' two rigid ^ ,: pa ^ i ^ ele # fl ^ n ^ latj ^ en of the type ^ like ^ them; usually used in R ^ tfe ^ eiB ^ procedures, arranged a preformed ^: ^ y ^u ^ | &f'iM ^^ - fe ^^ | * ^^

109826/0217

is then applied to the radially outer surface of the hell body arranged between said parallel sixth plates.

The tread is vulcanized onto the pre-vulcanized tire body by a number of radially displaceable Mold segments which together form a mold ring, the radially inner mold surface of which has the desired tread pattern is determined "applied to the radially outer surface of the tread".

There is then pressure and heat on the! Form segments and the rigid side plates brought into action, and the tire body and the barrel is fully vulcanized. The desired tread profile is created during vulcanization molded into the Xifiuf strip, As the tire body is partially vulcanized before the tread is applied it must be ensured that the tire body does not over-vulcanize during the final vulcanization process will. To ensure this, before the tread is vulcanized, it becomes a deformable one Inserted a hose or a membrane or the like, which contains a coolant, e.g. cold water. The one with During the vulcanization of the barrel, the water-filled hose leads away from the surface of the tire body,

109826/0217

pers down, which helps keep the temperature of the soap body below the vulcanization temperature dec running strip is held, v / ac the over-vulcanization of the tire body is essentially prevented.

The application of the procedure described above prevents any undesirable deformation of the belt or Kärkass layers of the tire body in the tread area during molding of the tread and vulcanization of the tread · The tire thus obtained is a more uniform product than the tires produced up to now, in which the vulcanization of the tire body and tread in a single operation.

Claims : 109826/0217

Claims (1)

P a t e η t a Ii s τ »r ü c Ii e: 1) {Method of manufacturing pneumatic tires, being a Beifenkü'rper made of cord layers v / ird and one Tread received and during the final JLus vulcanization The tread is molded into its tread strip profile j is characterized by that before the final molding and vulcanization of the iieifeiir; The body of the tire is subjected to a pre-vulcanization will. 2) Process for the manufacture of pneumatic tires, d u r c h marked that one has a hellish body also unvulcanized, rubberized cord layers with or without an unvulkariized barrel made of elastomer em katerial builds up so that the lieifenkb'rper in his im essential final, desired shape deformed and thereby at least: partially vulcanized that one unvulcanized tread made of elastomeric material on the molded and at least pre-vulcanized Eeif'onkorj / Or hangs up, except when the said run is not on; the body felt like it, and that one vulcanized the tread onto the heat body. 109826/0217 - ίο - * ■ 5) Method according to claim 1 and 2, characterized in that the radially outer surface the at least pre-vulcanized hull body is roughened before the tread * is laid, e.g. »by a rasping or bureau process. 4) Method according to claim 1 and 2, characterized in that that the molded and at least partially vulcanized tire body between substantially parallel side plates is connected, the tread between the plates on the radially outer surface of the tire body is placed and the tread between the plates and a number slidable, molded and vulcanized mold segments applied to the radially outer surface of the tread will. 5) Method according to claim 1 and 2, characterized in that an unvulcanized green tire including treads in a vulcanizing mold which is heated in the tread area has a smooth inner surface, so that the heather body is at least partially vulcanized and none Tread pattern is formed that the tire 109826/0217 from the Forin it is taken that it is in a tread molding ring is inserted, which is provided with a profile negative for the formation of the tread profile s, and that at least the barrel area is heated, so that a fully vulcanized heat is a to receive G) Method according to claims 1-5 »characterized that the tread during the heating and Vulkanisiereias the lieifenkörpers is cooled, and over-vulcanizing the tread strip to prevent. 7) Method according to claims 1-6, characterized in that that the tire body is during the heating and curing of the tread strip is cooled, thereby over-vulcanization of the heather body to prevent essentially. 8) Method according to claim 6, characterized in that the tread during the Vulcanization of the tire body in contact with a thermally conductive body at a temperature below the vulcanization temperature of the tire body is maintained. 109826/0217 9) Method according to claim 7 »characterized in that the Heifenkkörpers in contact during the vulcanization of the tread with a thermally conductive body at a temperature below the vulcanization temperature of the Tread is held. 10) Method according to claim 8 or 9 _t, characterized in that a coolant is passed through the body. ) Ver drive according to claim 10, characterized in that that the coolant is air "B) Ver drive according to claim 10, characterized in that the coolant is cold water. 109826/0217