DE2148420C3 - Method for applying a tread to the cambered carcass of a green tire or a tire to be retreaded - Google Patents

Description

3 4

kular oiieiuiert isr. Among them is an elastomer. Independent of the mentioned effects on the

To understand mixture, in which an essential elastome.-Mixture is not made of ham uiul

Proportion Uf-I Mt) Ii külketten and or Jer reinforcing even likely that the strong tension.

Accessories pantile! to the directions mentioned, the elastomer mixture is used in a preferred one

Titift. The elastomer mixture is therefore exposed in this direction, an orientation effect

In the direction of properties which, due to their properties, also affect the particles of other misunderstandings

in other directions, mainly in vertical parts, especially the Ruüteilthen. the

different directions for this. Orientation of the chains facilitates their mutual:

I ne such mixture exhibits in particular a Kri- approximation, whereby the connecting forces and

StallisatiomgiiL'h Speed on, which at low io improves the internal cohesion of the vulcanizate

Tr; πι pe rat μ r is greater than being a non-oriented person.

Mi-.chunj, if you use it. L-elastomer mixture measurements with a bend meter

Is crystalline. The X-ray diffraction also shows that a barrel drawn up according to the invention

Spectrum of a sample of a molecularly oriented strip when it is deformed in the stretching direction

Eljstoinei'mixture a much higher crystallization 15 clearly a lower hysteresis loss.

tkinsgnid when the mixture is in the preferred than with a deformation perpendicular to it. Di- · so far

Ridr.ung is stretched as if the stretch in known treads let this peculiarity

in a direction perpendicular to tiiizu. and miss improvement in properties.

In the meantime, it was found that when using the inventively manufactured

na: h the crfindungsgemälicn Vl-. drive on ι in 20 th pneumatic tires, an essential, technical model

1 laid out layoffs a substantial step is achieved. A number of attempts have been made

higher abrasion resistance and thus a longer tire for Bjgger and the same test conditions

Has runnability. gen show that the running time, which is a wear and tear

This can possibly be explained as follows: collapsing a weight loss of 5 "0 des

As mentioned above, the figure after the 25th stiffening shows an average of 70 hours

is applied to the carcass in accordance with the

brewed raw treads had a structural anisotropy that increased in tires manufactured according to the invention,

on, which results in an anisotropy of the> I from the Similar findings could with pneumatic tires for

internal structure affects properties. 1 Asian car can be helped, where in the event of a drowned

He ^- 'various physical properties, such as a tire manufactured according to the

de.n modulus of elasticity, the breaking strength line! lust of 5 °, only after a period of 225 hours

strain and electrical resistance, go to the other ¹ .. while in comparative studies of these

The differences in the various measurement direction loss of 5 ° <, already after a running time

genes do not exceed 30 ° η. On the one hand, on the one hand, 50 hours had occurred. Such a

the relative arrangement of the macromolecular 35 Längeiu.ig the running time by 50 to 100 "0, which is at

Chains to each other and / or the collection of the tire produced according to the invention,

K11I » and other admixtures and, on the other hand, can only be seen as a sign of a deep connection.

The loss of weight in the course of the year has been interpreted in different directions of the tread pulp

gen German different from each other. It should also be noted that the wear resistance

iindern the behavior of the tire at its 40 de ^s I aulstreifens not only quantitatively but also

Ben it / ung and other technological properties have been qualitatively improved, since the (weight-

The tread vjilust in the case of that manufactured according to the invention

The stretching of the vulcanizable Ron tire more evenly spread over the entire Laut Hache.

treads cr / eugte effect with regard to dcrOrii-n- divided.

titrunj dor macio molecules or Jer admixtures 45 _DlL . Hearing is done on the basis of one of the

olcilil in the following vulcanization Ai- nungen illustrated embodiment,

at least partially preserved. It turned out that boi thereby shows

cin.-r temperature of 25 C of the running surface of a Fig. I a schematic representation of a recording

Eifmdiingsgemaß manufactured pneumatic tire removal device for the to be applied to the carcass

mcne leile crystallized much faster than leile, 50 g _cn j _c . _n raw running strips,

the one ms of the same, but before the placement of FIG. 2 a radial section through a tire

on the carcass not subjected to the vulcanization of the raw tread and stretching

Mixture herivMcllten tread taken only- Fig. Λ aufstieifen a Radialschnilt djrch the [

the. This can be interpreted differently than that _c mes tire in an enlarged representation in his

the stretching carried out before vulcanization 55 final shape after vulcanization

at least certain parts of the rubber oriented. Fig. 1 shows a carcass 1 of a pneumatic tire selected

and that this orientation can be achieved through vulcanization during the application of a raw tread

is not completely b. We have succeeded in agreeing to a new casing or a new casing for Kart asse 1

Cut the oriented structure by using electrons around a card prepared for retreading

microscopic examination of the cash register according to the invention. The carcass is on a rim 2

to prove a stretched mongrel. mounted and is fitted with a hose except for one

The same conclusion can be drawn from the fact inflated ^{pressure of efva 1 kp / cm 2.} the

Be that a sample of the tread after the rim 2 with the carcass 1 is made by means of a sheet metal

Vulcanization oa greater crystallization tendency of motors 3 set in rotation. The speed of the elec-

zcigl, if you move them in the direction of the front of the 5s tromotors 3 is controlled by means of a follower roller 4.

Vulcanization exerted tension stretches as if the circumferential speed K, the carcass 1

to keep the elongation constant in a direction perpendicular to it.

Direction is carried out. The raw tread is

Ral-shaped winding of a rubber film 10 onto the carcass 1 is produced. The rubber film 10 contains the weight percentages given below Substances:

Smoked Sheets I HK!

Stearic acid 2

HAF carbon black 50

Zinc oxide 5

N-Cyclohexylbenzothiazylsulfonamide I

Phcntyl- / 3-naph (hylamine 1

Plasticizer 5

Sulfur 2

The rubber film 10 produced on a calender is pulled off a roll 15. She has in this process section a thickness of 2 mm. The roller 15 is with the help of a friction roller 16 in The direction of the arrow rotated. One of one

Polyäihy !?

17 separates the successive layers of the rubber sheet 10 of each other. When unwinding the roll 15, the intermediate layer 17 is on one of a Motor driven drum 18 wound up.

From the roll 15, the rubber film 10 arrives in a compensation store 19, which stores the rubber film 10 under low tension in a variable section, so that the roll 15 can continue to be unwound between two raw tread application operations. Between the compensation reservoir 19 and the carcass 1, the rubber foil 10 runs over driven rollers 20, 21 and 22, which give the rubber foil 10 a constant linear speed V _n , which is significantly lower than the peripheral speed K _{1 of} the carcass 1. Between the rollers 20, 21, 22 and the carcass 1, the rubber film 10 is therefore subject to stretching, as a result of which its length changes in the ratio V ₁ IV ₀ .

On the roller 21 there are knives 24, which either according to a set program Cut out a central part or two side parts of the rubber sheet 10, whichever is Profile is to be given to the raw tread.

For the stretching, in the case of the above specified mixture the following initial and final dimensions of the rubber sheet 10:

Initial thickness

Final thickness

Initial width

Final width

Degree of elongation

2.0 mm

about 1.1mm

650 mm

450 mm

2.7 (i.e. 170 ° / o stretching)

Winding speed 18 m min.

When a number of layers of the rubber sheet 10 has been applied to the carcass 1, which for Production of the desired raw strip are required, the speed of the electric motor 3 for a brief moment increased to an additional To produce permanent stretching of the rubber sheet 10 between the carcass 1 and the roller 22.

S You can then cut off the rubber sheet 10, Remove the carcass 1 with the raw tread and place a new carcass 1 on the rim 2. The tension of the rubber sheet 10 promotes the adherence of each turn to the preceding one during winding as well as the removal of air / wiping of the rubber sheet 10 and the carcass 1.

After the carcass 1 has been provided with the raw tread. is vulcanized. One can proceed in the usual way for a new tire, by placing the tire in a press mold and then vulcanizing it . \ one '"Hchiütcr odti! bring a kettle, where he mil slmmcndem steam

is vulcanized, after which the tread profile with Using cutting tools is formed.

Fig. 2 shows a pneumatic tire before vulcanization. A carcass 30 contains a reinforcement 31 Bead cores 32 is knocked around. Also are

»5 a Schcilclbeuehrung 33 and a raw tread 34 present. As can be seen, the raw stripper consists of ' 34 from a spiral overlapping of a large number of turns 36 which all run parallel and have the same thickness.

Fig. 3 shows the apex of the same tire after vulcanization. The introduction of a profile 37 in the raw tread changed etsvas the course and the thickness of the windings 36. mainly in the vicinity of such zones where wormed flow of the mixture occurred. The layer structure of the tread 35 is clear, however to see. If the tire is profiled after vulcanization, the layered tire is not Structure of the tread 35 recognize the permanent parallel course of the windings 36 (Fig. 2).

There can be several rubber sheets 10 under different Tensions and length changes are unwound. It is also possible during the Winding up to change the tension according to some law. There may be tension when winding superimpose in the longitudinal direction with a tension in the transverse direction. The level of tension and Elongations can do a lot! be larger or smaller than in the example described. It is essential that

So the raw tread 34 either before or bc '. to the Winding experiences a great stretching and that it is in a strongly tensioned and stretched state, the is retained after winding, is vulcanized.

For this purpose 2 sheets of drawings

Claims (2)

Z i 4ί3 1 2 stretching or other mechanical tensions, which claims: when creating the raw treads, there are no noticeable effects 1. Method for applying a running anisotropy. Such a "quasi-hot-opie" Strip on the cambered carcass one-, air- 5 of the properties of rubber is used in the green tire or a completely new technology is considered favorable, because of the air tire, in which a vulcanizable step occurs internally and also by the vulcanization Raw running strips by spiraling up unremoved savings. Irregularities in a film made of a vulcanizable elastomer of the mass or shape of the pneumatic tire compound is formed on the carcass and can lead to an imbalance, is then vulcanized, thereby gü- This also applies to treads in we-.enthclum indicates tJaß the film before or when pneumatic tires du: wherein the I.aal-300 ⁿ 'o their original length m of the running direction of stripes on the cylindrical green tire placed stretched winding were prepared ride on the carcass to IUU to the so-called Flachbandverdem, is, and that the vulcanization is cambered with i5 and together with this. This stretching of the film takes place. in this case ...- nThe length of the I.aur- 2. Veifahren according to claim 1, characterized in that the strip is linked to an oucr contraction, db denotes yes. the film is bound to that of the 'iarkasse before application. The carcass is stretched beyond the desired final layer caused in the raw treads, and ^{anisotropy is only applied to the carcass 20, so} that it is emulsified after the vulcanized film up to öieien im fei: ig ..- i 'ai.fstreif' .- n is essentially visible to the desired final degree of stretching It is known ardrersei.s from GU-PS 9 81 877, 25 one for use in tire manufacture certain elastomer mixing by stretching: n um a value between 200 and 1000 ° ο and vulcanizing in the stretched state anisotropic properties The invention relates to a method for issuing / u. Treated in this way bring eini: «Treads on the camberie 30 elastomer compounds are not for the i.auf carcass a pneumatic tire blank or a round strip, but rather for reinforcement inserts renewing air tire, in which a volkani instead of the usual natural or synthetic ones Customizable raw running strips through spiral-shaped textile fibers. which has a great tensile strength in the Wrap ci'ier film from any vulcanizable longitudinal direction due to vulcanization The elastic modulus is molded onto the carcass in the stretched state and then vulcanized. and the tensile strength of the elastomer core in the A method of this type is disclosed in US-PS direction of stretching relative to the transverse direction 34 87 868 known. The application of the raw run is considerably enlarged, so that reinforcing strips are inserted from it by winding a film in a spiral without the otherwise usual textile thread particularly with heavy-duty and off-road tires 40 can be provided. used with a large tread depth, which is a contrast to that of treads in the first place Raw treads with the required total thickness Linii desired property a large abrasion would be difficult to handle. stability, which is the modulus of elasticity and There are also methods for applying the Ziigfcstigkei 'are not decisive, ί on the first known in which a raw tread 45 strip material with a low modulus of elasticity, such as With the required thickness of Gcsaint, the length of which, from the simple vulcanization of nature, is slightly shorter than the circumference of the carcass. rubber without reinforcing agents such as carbon black. results, when applied to the required length w-. is greater abrasion resistance than one will. He is a Ciiirnmimisduing known from DF.-PS 8 99 551 with a large Rnß content, so ver process the raw tread has the shape of a 5 "proportionately large modulus of elasticity closed ring, the one around 10 to 15 ° 0 is the abrasion resistance of reinforcement inserts has a smaller circumference than the area on which it is naturally without reinterpretation. should be set. As a result, it is the object of the invention in the following. a method of lying Protilschichten a pressure are generated, initially specified type / 11 sound, the I uiiide / facilitates the vulcanization process. For 55 strips with significantly improved wear resistance: • other, from DE.-AS 11 68 068 and DE-OS speed results. 14 29 02 ·) known process becomes a raw run- Naih dir Irfimlung becomes ilic-e sewing through strip to a slightly shorter length than the nominal length, so that the lohe \ or during winding is cut off, and when it is laid through the carcass it is brought to the nominal length by 100 to '() {). the stretching, the 5 NC H _[n g _e j _n for the running direction is stretched, and that ilas in this case is also in the order of vulcanization with this stretching of the film is wenigcit percent serves to compensate for the thus obtained pneumatic tires , in which Allowable length fluctuations. it is both a new tire and Which can act as a retread tire with the known methods applied is because treads are essentially isotropic; lt. that 65 is characterized by that its tread consists of an ilic elastomer mixture from which they consist, in all vulcanized elastomer mixtures, which has approximately the same properties in directions. The _e i _ncr minor direction parallel to the running surface and vorzugsbei some processes carried out as molecular patallel to the running direction of the tire