DE2553975A1 - IMPROVED PROCEDURE FOR REPLACING WORN TIRES THROUGH THE DIRECT FITTING OF A PRESSED TREAD ON THE TIRE CARCASS - Google Patents

Description

ITAL-RUBBER 8th r. 1., S. Alessio (Lucca) / Italy

IMPROVED PROCEDURE FOR REPLACING WEAR TIRES THROUGH DIRECT ATTACHMENT A PRE-PRESSED TREAD ON THE TIRE CARCASS ',

The present invention relates to a method for the renewal of worn tires by director Attaching a pre-pressed tread to a flat tire carcass.

The conventional methods for the renewal of worn tires can essentially be divided into two groups:. ■. _u

a) hot process;

b) Allowing at low temperature. · ·

609830/0545

a) In the hot process, the not yet vulcanized

ized tread attached to the rasped carcass; The carcass and tread are combined in a special ·. -Len.Form arranged and by, the supply, of _: thermal energy by steam, gas or hot air, the .Vulcanization is carried out at high temperatures. ·

• During this phase, the drawing of the running surface is created, which obviously depends on the shape used. ' _t . ·. ". - ■ ■■ ■. N,; ₁ v; -» ι ι " ¹ '

This e- method has various disadvantages, in particular:,. · · Ι -. . ,

- 'a' premature aging .des Bndprodukts due to the use of high temperatures;..... ,, "■ - ■ -high investment costs due to the large number of forms that are required for a sufficient elasticity in production _r ·

Other hot processes follow the above technique, but provide for the attachment of a vulcanized tread. ' · · ~. ■ '· ,. , ·.

With this variant, the disadvantage caused by the shapes can be partially eliminated. On the other hand, there is another major disadvantage: the double vulcanization worsens the mechanical properties of the tire quite permanently.

. b) In the conventional process, which requires low tem-

■ ■ * ■ "

temperatures-use , - the barrel becomes shallow, with the help of a . ' · "· ._"'j/' - 80 9 83 070 5'4 5 '· - "■ ··' · ■ ''. '·'" - ■ '■

■■■ '· .- ■ ORiGiNALINSPECTED

interposed adhesive strips on the carcass of the tire to be renewed, · r

This strip, which is mainly made of rubber and contains, among other things, an accelerator and a vulcanizing agent, is at low temperature stored in a special protective cover to avoid unwanted premature vulcanization reactions. This strip can only be used on each. L to be attached to flat. - ,,

In other cold processes, instead of a single, two different strips containing both the accelerator and the vulcanizing agent, likewise "strips mainly made of rubber are used, one of which contains the accelerator and the other the vulcanizing agent. -

These strips must also be carefully used before they are used be isolated to avoid undesirable reactions. ·.

During vulcanization, the. whole unit into one Protective hood included, which over the surfaces the tread and on the side surfaces of the Tire is properly tensioned. This hood is provided with a valve through which the between the Air trapped in the hood and the tire can escape to the outside. ι r

This is to avoid that during the volcanic

609 830/0545 '-

- ORIGINAL INSPECTED

sation Oxidations or other changes in the chemical-physical properties of the vulcanized material and then the vulcanized material arise . ■■■ · ■ · '.:. · ■ · ".

The adhesive strips and the tread are applied to the tire carcass by rollers, whereby the air trapped between the carcass, adhesive tape and tread during attachment can escape laterally becomes, -, _Λ '-; - · * ■ ■ *'. ,. '. ·. . ', ··. ·

These widely used methods have various disadvantages: ·, ...., "., V- possible displacements of the adhesive strips against the edge. ~ Of the zone in which the tread is to be applied;. · . -. ■ ■

- difficulties in achieving equal massive peck of adhesive tape, as a result of these accumulations of the adhesive at certain points, while in other areas little or insufficient adhesive is present.

Due to the above disadvantages, the adhesion between Tread and carcass irregularly so that there are zones - in which the tread separates from the carcass after a relatively short period of time, which increases the service life of the renewed tire - significantly shortened

There is another, no less important, disadvantage ift. of the air, 'which during vulcanization between the

• '' 609 830/05 45

ORIGINAL INSPECTED

Protective hood and. remains enclosed in the tread,

Because despite all care and despite the technical measures that are taken when the hood is attached, the air cannot be completely removed from the interior of this protective hood. If so, even a minimal amount of air is always trapped in the spaces between the ■ surface of the tread

^: impossible. ''■ ··. \ "'/ ι ■ ■ - ......

. '■■■ "· ■ -' * ■ · *

For all of the mentioned cold processes, the between ' single or multilayer adhesive strips provided for the tread and the tire carcass separately from the Running surface and separated from each other in special

- world conditions and enclosed in a special protective cover be kept to prevent premature vulcanization to avoid which the adhesiveness

ι m. .

would significantly decrease. Only at the moment of use can these strips be attached to the tread or to the carcass, which involves difficult work for a relatively long time. '■ \\:

The main aim of the present invention is to eliminate the above-mentioned disadvantages by means of a Procedure for the renewal of worn tires by directly attaching one from a pre-pressed Tread "and from an adhesive strip. Or film existing unit on the tire carcass, whereby: - an adhesive film that can be placed on the tread.

without any risk of premature vulcanization with the '·.' - ^v 609030/0545 ^v ■ "'-V ■'

• '■ - * ■ ·

• '· ι ■ .. · ■■. 5- ■; - '■ · . 'ORIGINAL. INSPECTED

Making the tread can be prepared;

- When "applying ι this film to the Lauffia-

• ι

before there is no risk of damaging shifts and the one enclosed between the running surface and this film Air is safely eliminated;

- the air trapped between the protective hood and the tire during vulcanization is completely and safely removed. ι. ·. . ■ ·, _f . " ν - _t ...

• These and other goals are achieved by the process' according to the present invention, w.which mainly through the following. Phases is marked:. ", ', - preparation of an adhesive film. * L - for.fixing the tread on the tire carcass, including at least one non-vulcanized binding agent a vulcanization accelerator and at least one vulcanizing agent, as well as a high "weight percent of Vulcanizing resins' and a combustion preventive agent

used! / be · which this non-vulcanized bin .demittel'bei a temperature of 100 ⁰ C cure and the reagents stabilisieren.können _r so that the beginning of Vulkanxsierungsreaktion up to temperatures be-

cal / i 35 ° C and 40 ⁰ C can be prevented; ^ - fastening DThis adhesive sheet "., By rolling on the inner surface of the tread and simultaneous perforation cdieser foil for the removal of the ^v trapped between the tread and Klebstoffblie air through the t on this Klebstoffolii & mounted holes""·..'■,' ί _: :: ■: '· ^: ■ . ·;

Different characteristics and advantages of the invention . ■ '· 609830/0545 ·. "' 'V

/ ■ ORIGINAL INSPECTED

Procedures go out clearer. of the following precise

Description of a preferred embodiment with reference to the attached exemplary drawings. It shows:. - '· ^t; · . '■ · ■■■; ■ - ".. r.

Fig. 1 shows the block diagram of the working stages of this process

·. '■' «
... 2 is a schematic view of the process, brass flat to compressed run and adhesives • ■ · stoffölie with WEL • ·>'' ·: existing unit is achieved;

· '■ · ■' · ·. ' ., ■ * ■■ - · ■ '
Fig ^.: 3 "ej.rie Schematic, shown partly in section-

^ '. ··· "" ·' th view of the complex tread-adhesive- · "Foil tire carcass protective hood, which on a rim is mounted .; :

FIG. 4 is a schematic view of the shown in FIG.

- · ■ *. .Posed complex inside a vulcanization · - * ■ ». '■;'J. kesseis. _{- 4.} ·>',

'■. '' '■ ■ " . ■ · ■ ■ · ■ / ■ -

In a work step not belonging to the method according to the invention, the tread 1 is made in a conventional manner, preferably with a special cross-section (see FIG. 3). prepared, namely, the 'inner surface la, which, .Me can later be seen, _Vup% <fthe rolling surface of the ßeifenkärkasse 2 to Lie gene comes equipped with "a suitable curvature, wherein the radius of curvature is chosen _t art, djass the 'unit consisting of running surface and adhesive film' perfectly 'on the prepared rolling surface of the'

fairing carcass 2 veined. . ', ·

: _t f ■ .- ..! · .. '. ■; . . • The preparation ic of the rolling surface * 'a'er tire car- · / ^% ' ■ -, 6098'-30 / "05U" ■ ■ · · ■ - "■

- · · ■ ■ · * ■ , L

■ i \ ^: '7

/ ORIGINAL INSPECTED

■. . t

Case 2 is made by rasping, whereby all remnants of the worn tread are removed from this carcass. The tire car kasse is more., Laterally than in the middle, and the rolling surface 2a then has a curvature with a radius of curvature R, as shown essentially in FIG. The same radius of curvature R is used in the manufacture of the tread 1 so that the inner surface la also has a curvature with the same radius of curvature R and the surfaces la and 2a of the tread 1 and the tire carcass 2 with one another match.- ' ^: · ■'. »;. - · - '-'ι", \' · ■.

With this preferred level of work, a large

Disadvantage can be eliminated, which is found in some conventional Methods for preparing the tread

and the tire carcass. "With these methods, the inner surface of the running surface is completely flat

i · I ■

forms, while layers of adhesive are arranged in the lateral zones of the tire carcass, so that the rolling surface can take up the L on the flat *. '.

it S '■. '■ ■ ·'! ■

• The method according to the invention exists as already

· ■ .. ■ '■ says in the preparation of an adhesive oil that can be applied to the running surface. ^ 3 during the production of this running surface, whereby the unit consisting of running flat ujid adhesive film ^ can be packaged and stored without the risk of any reaction. tioneh exists · '. <■% ...., f · · ·. ■

These marks are used with the * "'■' "'609 8 3Ö / 05 4 5-.'"" ^l ';' ^!

8th .

This is achieved in that the reactants for the production of the adhesive remain are dosed in such a way that - «that there is a large percentage of yulcanizing resins is. ". Also-becomes an appropriate." percentage of one Combustion-preventing agents ^ added, which the to prevent the above-mentioned undesirable reactions.

The reaction staff from which die'Klebstof fplie are made will j. can be changed both qualitatively and quantitatively depending on the composition of the tread become. · - · * ■. '

As an example, the following is a weight-based composition of the 'reaction substances for the production of an adhesive film suitable for most * commercially available tires'**'^;; \ ^v > ^ri - ^T .-: · - ■ '"; · ■.'. '■■

INGREDIENT _. WEIGHT SHARE

Rubber or polypropylene. . I ^ '■ <■ 100

i '

/ Zinc oxide r; _f ■ _i . 5rlD

Stearic acid '0.5-1.2 rust preventive (poly 2-3-4 trimethyl

-1-2 dihydroquinoline) _w ■. . . . , 1

Ozonization inhibitor (n-phenyl - N -.

cyclohexyl .para phenylenediamine,. 1-2

Pinetaire (pine tar) .... 5-10

Vulcanizing resins (polyethylphenol) 15 \

. Adhesive. (Liquid Kumaroi ^ -l '*'

Indian resin). . '.., · ■ ■. .. ■ i_ .... _t ... 10,

Buna wel-d (Polymer 780) '10,

• - i. . ■ · · ■ ■ *

insoluble sulfur. ^ 3-5 accelerators (guanidinediphenol <and '",'.' .., 6.09 8 307 05.4 5

ORIGINAL INSPECTED

Mercapto-benzotriazole). 1-3

Rus, s._ μ,. . _t . w _v,. ■ '30' ·

Anti-burn agent (Santocard

Due to the high percentage of vulcanizing resins it is it is possible to obtain a stabilized product. which its adhesion value indefinitely

preserved ... ^ ₁ ■ *. ·. »'. ,. ■ .-

Through the. Addition of an appropriate percentage of anti-burn Means will be the. Danger of undesirables premature vulcanization reactions are eliminated, and the adhesive oil 3 can be used long before it is used

the tread 1 are applied because. The .unit consisting of abrasive film "and tread - preserves its properties for an unlimited period of time. -:. _t .

The film produced in the above composition was subjected to rheometric "Monsanto"tests; a vulcanized at 100 ⁰ C sample showed the following time-dependent physical properties: .. _4th . ■■ ..

. ■; 2h ._ ■ 3h 4h Module.at * 300 # ^k ' • 63 64 * 85 Breaking load 238. 237 • 235 Elongation at break. 640 610 - 56Ό, Hard Shore A 46. 49 y 53

The adhesive sheet is used in the following. Work stages produced: · *,. » . . ,.,. '^ ' - "'""-.!""/" L

• 609 ^ 30/0545 · ■ ·

t 'INSPECTED'

- Pre-kneading the rubber mixture, the effect of ■ of. mechanical! * processing, temperature. and the "usable of peptizers are combined with one another until such a viscosity is achieved that, with the following admixture of reinforcing agent ^, Fillers and vulcanizing agents form a homogeneous mixture arises; ,>. '».- ,.

- first rest phase for about 12 hours;

- Dosing and mixing of the components (excluding vulcanizing agents and accelerators) χη ' open. _v , mixing containers at low temperatures;

- second rest period of about 12 hours to get a, perfect Diffusion: the reactants and the inert constituents of the mixture too. enable;

- Admixture of the accelerator and vulcanizing agent in an open mixing container at low temperatures (30-40 ⁰ C); i. ~ ϊ ·

- calendering, in thin foils;

- Cutting the foils according to the dimensions the tread on which it should be used up

After the film 3 is made in the above manner has been, it is pressed on the pre-pressed and smoothed-

r
th tread 1, whose contact surface la, "has been coated with a special rubber-based adhesive". ·,

For the application of the adhesive film on the running surface according to the invention & SEN process run _r the tread 1 and the film 3 except by normal tensile and

6098 30/0545
11

Pressure rollers 17 by two further rollers 4 and 5. The roller 5 is on its entire rolling surface with a row provided by tips 6, which are designed such that they pierce the film 3 until they reach the surface reach the tread 1. Then the running surface 1 and the film 3 get into the interior of a sub;

. · R
pressure chamber 7, so that both the air trapped between the running surface 1 and adhesive film 3 through the holes made in the film 3 ″ and the air present in these holes escape before the unit consisting of the tread and adhesive film die ¹ leaves chamber 7, a protective film made of polyethylene or some other plastic is applied to the free film surface 3 to prevent air from returning into the holes in the film .3 and to exclude dust and other foreign substances] - ", wel- ■ before the chemico-physical properties of the. Slide could change. ,,

When replacing a tire, it consists of a tread and an adhesive film The existing unit is therefore already ready to use and can easily be applied to the previously rasped and smoothed one and a roller surface coated with a solution. the. Ripe enkarjcasse to be attached.

This process is carried out in the conventional manner, without the running surface, abrasive film, and Tire carcass against each other, could move, mainly thanks to the fact that the film 3 and the tread 1 already form a unit *, · .- '.. ···· ■. ·

609830/0545. ,

12 ·. '

At the end of this work stage, the tire will be like a conventional one Process wrapped in a protective hood β. and mounted on a special rim 10. This protective hood 8 envelops the surface 1 and the side surfaces 9 of the tire ^ while its edges from this rim 10 · be held tightly against these side surfaces.

The protective hood 8 is provided with a valve 11, through which the air trapped inside the tire when this hood was attached can escape outside .. At the end of this work stage, the tire is arranged inside a Vulkanxsierungskessel 12, ι,. ■

According to the method according to the invention, before the actual Vulcanization the protective hood .8, connected via a line 13 with a .Unpressure apparatus 14 to the inside of the protective hood and the normal -Wise included in the interstices of the tread 1 Completely eliminate air. Air is then passed through a line 15 into the interior of the tire carcass or into the interior of an air tube 16 present in this tire, until approximately the normal operating pressure of the tire is reached

Subsequently, the vessel 12 is set in operation for vulcanization (optimal temperature 100 ° C) _f by introducing to a suitable heating fluid (preferably hot air or steam) and the kettle under a slightly lower pressure than those sets des.Reifens ^ until the conditions can be achieved - in which the vulcanization

'609830/0545'

• *

takes place by what tread and tire casing perfectly connected and the optimal chemical-physical properties of the vulcanized material guaranteed. '

That which is present between the reactants of the adhesive film anti-burn agents delay the start of the vulcanization reaction, so that the operator manri npch can also intervene after the boiler has been commissioned, especially if after the introduction of the tire prepared for vulcanization into the 'interior of this boiler should reveal defects'.

In contrast to the previously known adhesive films the stated according to the inventive method after the film remains forth rheometrisehen "MO ₁ MSANTO" tests at orthodontic completely stabilized ⁰ C up to temperatures of 3'5-40 ⁰ C, whereby the start of the Vulkariisations-Teaktion delayed by about 20-30 minutes.,

Obviously. Many changes can be made to the invention be made by. For example, the specified 'reactants in the range of the following claims replaced by other chemically equivalent substances. . ·

609830/0545

Claims (1)

Claims ^ Γ V 11.1 Improved method for the renewal of worn tires by directly attaching a pre-pressed tread to the tire carcass, in which the surface (la) of the tread, (l), preferably with a radius of curvature, lies on the rolling surface (2a) of the tire carcass (2) 2U (R) _{1 is} produced, which corresponds to the radius of curvature (Rl) of this, RoI ^ f la- · before (2a), and in which, the renewed tire after the application of the barrel flat (l) on the tire carcass . (2) and before the introduction into "a vulcanization chamber in a protective hood (8)" is wrapped, which lies tightly against the tread (1) and on the side surfaces (9) of the tire, this process being characterized by the following work steps : * ■ ■ « - Prepare an adhesive film (3) for attachment the .Laufflache (l) on the tire carcass (2) ^ for what purpose in addition to at least one non-vulcanized binder, at least one vulcanization accelerator and at least a vulcanizing agent, as well as a high percentage by weight, of vulcanizing resins and a combustion-preventing agent . tel, which vulcanize this non-vulcanized ₍ binder at a temperature of around 100 ^° C.) . and the reactants can stabilize, so that the beginning of the. Vulcanization reaction can be prevented up to temperatures of 35-40 ^{0 C;} ,,. · '' Γ - Attachment of this adhesive film (3) by rolling the, Innenobe'rflache (la) of the running surface (l), and simultaneous Perforation of this foil (3) for idija elimination between the tread (l) and the adhesive film (3) 6098 30/0545 trapped air through the on this adhesive sheet (3) holes made. ', 2. Improved method according to the above claim, characterized in that after the adhesive film (3) has been attached to the inner surface (la) of the running surface (l) on the free surface of this film (3) immediately after the removal of the between A protective film (3a) * is attached to the tread (l) and adhesive film (3) in the air. ,. ^f *. ',,. , 3. Improved method according to the preceding claims, characterized in that after "wrapping the renewed tire in a protective cover (8)" and after the introduction of the whole into a vulcanization chamber, the protective hood (8) in connection with a vacuum device is set in order to achieve a negative pressure in the interior of this protective hood (8),. ,,? . 6098 30/0545
16 Empty soap