WO2002090092A1 - A device and a process for the retreading of tires - Google Patents
A device and a process for the retreading of tires Download PDFInfo
- Publication number
- WO2002090092A1 WO2002090092A1 PCT/BR2001/000061 BR0100061W WO02090092A1 WO 2002090092 A1 WO2002090092 A1 WO 2002090092A1 BR 0100061 W BR0100061 W BR 0100061W WO 02090092 A1 WO02090092 A1 WO 02090092A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tread
- connecting film
- carcass
- tires
- reactor
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
- B29D30/54—Retreading
- B29D30/56—Retreading with prevulcanised tread
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0855—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using microwave
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0662—Accessories, details or auxiliary operations
- B29D2030/0666—Heating by using fluids
- B29D2030/0674—Heating by using non-fluid means, e.g. electrical heating
Definitions
- the present invention refers to a device and process for retreading worn tire treads, by recovering said tires with a new previously formed and vulcanized tread.
- the assemblies For achieving the vulcanization of the film and the consequent incorporation of the new tread to the carcass, the assemblies, usually in a number from 10 to about 20 and being formed, each one, by a carcass, a connecting film and a new tread usually defined in multiple complementary circumferential extensions, are placed inside an autoclave, so that the connecting film and the adjacent and confronting surfaces of both the carcass and the tread be heated at a determined temperature, generally higher than 90°C, and so maintained by a certain time, in order to promote the vulcanization of the connecting film and the consequent fixation of the tread to the carcass.
- the heating required to vulcanize the connecting film is provided by induction, by increasing the temperature of the whole environment of the autoclave from heat sources defined by electrical resistances or steam coils, operating jointly with forced air circulation provided inside the autoclave, with the aid of a turbine or a fan and respective hot air conducting tubes. While they operate satisfactorily regarding the vulcanization of the connecting film, these known heating systems by induction lead to an enormous and unnecessary consumption of energy and operational time. Due to the utilization of induction heating, these prior art systems promote heating of the whole mass associated with each tire inside the autoclave, including the carcass, the connecting film, the tread, the external envelope and, in some cases, the inner wheel used to lock the envelope.
- the heated air which is circulated inside the autoclave, heats the whole mass therein, until the connecting film, which is pressed between the carcass and the tread, is taken to a temperature usually higher than 90°C, remaining in this condition for a certain time, until the complete vulcanization has been achieved.
- the time required for the heating thereof is also relatively long, usually about 4 hours for the autoclaves containing a load of about 10 to 20 tires .
- the device of the present invention is employed for retreading tires, each tire being formed by a carcass with an abraded and clean peripheral surface, onto which is seated a vulcanizable connecting film, which is externally covered by a previously formed and vulcanized tread.
- the device comprises a reactor defining a heating chamber, which is dimensioned to receive a plurality of tires to be retreaded, and which is internally provided with a plurality of microwave emitters, which are designed to operatively actuate on the connecting film through the thickness of the respective tread, said microwave emitters being operatively associated with a control unit for regulating the operational time and the power.
- the device defined above in general terms allows the connecting film, not yet vulcanized, to have its molecular structure submitted to the effect of the microwaves long before and more effectively than the circumjacent structures, such as the carcass, the tread and the envelope, with the reduced mass of said connecting film being heated more rapidly, allowing to achieve the desired vulcanization in a time of about up to 1/8 the time usually required for the same operation of the prior art devices.
- Figure 1 is a cross-sectional view of a worn tire carcass, already abraded and covered by a vulcanizable connecting film and by a previously formed and vulcanized tread placed inside the heating chamber of a reactor (autoclave) ; and
- Figure 2 is a partial cross-sectional view of the assembly of figure 1, said view being taken according to line II-II in the previous figure.
- the invention is applied to the retreading of tires, each tire being defined by a carcass 10 with its external surface already abraded, clean and degreased, onto which is applied a connecting film 20 in a vulcanizable material, such as a rubber compound compatible with the material of the carcass and with that of a tread 30, which has been previously formed and vulcanized and which is placed on the connecting film 20.
- a vulcanizable material such as a rubber compound compatible with the material of the carcass and with that of a tread 30, which has been previously formed and vulcanized and which is placed on the connecting film 20.
- the tire thus formed is mounted in an adequate envelope 40, such as for example, that contemplated in the patent application PI9604105 of the same applicant, and then conducted to the inside of the heating chamber 51 of a reactor 50 that may be formed by the shell of an autoclave of the type normally used for retreading said tires by means of induction heating and which is dimensioned to receive, therewithin, about 10-20 tires to be retreaded, which are arranged side by side according to an alignment generally coaxial to the heating chamber 51.
- a reactor 50 may be formed by the shell of an autoclave of the type normally used for retreading said tires by means of induction heating and which is dimensioned to receive, therewithin, about 10-20 tires to be retreaded, which are arranged side by side according to an alignment generally coaxial to the heating chamber 51.
- the heating chamber 51 of the reactor 50 is provided with a plurality of microwave emitters 52, for example having an individual power of about 800 watts, which are adequately placed in the internal face of the reactor, in order to emit the microwaves in the radial direction, towards the connecting film 20, through the tread 30.
- the connecting film 20 has a molecular structure that is less cohered than that of the carcass 10, of the tread 30, and of the envelope 40, and is formed of a non-vulcanized rubber compound, submitting the assembly to the molecular agitation by the microwaves will heat the connecting film 20 much more rapidly, making the latter reach the vulcanization temperature, which is maintained for the necessary time, with a minimum energetic consumption for heating the tire.
- ducts 53 containing a circulating refrigerant liquid such as water or forced circulation air, may be provided.
- a circulating refrigerant liquid such as water or forced circulation air
- the ducts 53 for the circulation of liquid may be those employed for the circulation of hot air in the autoclave.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Tyre Moulding (AREA)
Abstract
A device and a process for the retreading of tires, each tire being formed by a carcass (10) with an abraded and clean peripheral surface, onto which is seated a connecting film (20) made of a vulcanizable rubber compound and externally covered by a previously formed and vulcanized tread (30). The device comprises a reactor (50), which is dimensioned to receive a plurality of tires to be retreaded, and which is internally provided with a plurality of microwave emitters (52) placed along the internal face of the reactor (50), in order to emit microwaves in the radial direction towards the connecting film (20) and through the tread (30).
Description
A DEVICE AND A PROCESS FOR THE RETREADING OF TIRES Field of the Invention
The present invention refers to a device and process for retreading worn tire treads, by recovering said tires with a new previously formed and vulcanized tread.
Background of the Invention
It is well known in the prior art the retreading system, according to which a new tread, which is previously formed and vulcanized in the form of strips, is incorporated to the abraded, clean and degreased external surface of a worn tire carcass, by means of an intermediate connecting film to be vulcanized to both the carcass and the new tread. For achieving the vulcanization of the film and the consequent incorporation of the new tread to the carcass, the assemblies, usually in a number from 10 to about 20 and being formed, each one, by a carcass, a connecting film and a new tread usually defined in multiple complementary circumferential extensions, are placed inside an autoclave, so that the connecting film and the adjacent and confronting surfaces of both the carcass and the tread be heated at a determined temperature, generally higher than 90°C, and so maintained by a certain time, in order to promote the vulcanization of the connecting film and the consequent fixation of the tread to the carcass. In these known systems, the heating required to vulcanize the connecting film is provided by induction, by increasing the temperature of the whole environment of the autoclave from heat sources defined by electrical resistances or steam coils, operating jointly with forced air circulation provided inside the autoclave, with the aid of a turbine or a fan and respective hot air conducting tubes.
While they operate satisfactorily regarding the vulcanization of the connecting film, these known heating systems by induction lead to an enormous and unnecessary consumption of energy and operational time. Due to the utilization of induction heating, these prior art systems promote heating of the whole mass associated with each tire inside the autoclave, including the carcass, the connecting film, the tread, the external envelope and, in some cases, the inner wheel used to lock the envelope. The heated air, which is circulated inside the autoclave, heats the whole mass therein, until the connecting film, which is pressed between the carcass and the tread, is taken to a temperature usually higher than 90°C, remaining in this condition for a certain time, until the complete vulcanization has been achieved.
Besides the loss of the energy used to heat the whole mass associated to each tire, which mass may reach about 100 kg, the time required for the heating thereof is also relatively long, usually about 4 hours for the autoclaves containing a load of about 10 to 20 tires .
Considering the high production rates, the retreading companies are obliged to have multiple autoclaves operating by turns.
Disclosure of the Invention
It is a general object of the present invention to provide a device for retreading worn tire carcasses, with previously formed and vulcanized treads, by means of a relatively simple construction and with a great reduction in both the energy consumption and the time required to complete the operation.
It is a further object of the invention to provide a process for achieving the retreading considered above. The device of the present invention is employed for
retreading tires, each tire being formed by a carcass with an abraded and clean peripheral surface, onto which is seated a vulcanizable connecting film, which is externally covered by a previously formed and vulcanized tread.
According to the invention, the device comprises a reactor defining a heating chamber, which is dimensioned to receive a plurality of tires to be retreaded, and which is internally provided with a plurality of microwave emitters, which are designed to operatively actuate on the connecting film through the thickness of the respective tread, said microwave emitters being operatively associated with a control unit for regulating the operational time and the power.
The device defined above in general terms allows the connecting film, not yet vulcanized, to have its molecular structure submitted to the effect of the microwaves long before and more effectively than the circumjacent structures, such as the carcass, the tread and the envelope, with the reduced mass of said connecting film being heated more rapidly, allowing to achieve the desired vulcanization in a time of about up to 1/8 the time usually required for the same operation of the prior art devices. Brief Description of the Drawings
The invention will be described below, with reference to the attached drawings, in which: Figure 1 is a cross-sectional view of a worn tire carcass, already abraded and covered by a vulcanizable connecting film and by a previously formed and vulcanized tread placed inside the heating chamber of a reactor (autoclave) ; and
Figure 2 is a partial cross-sectional view of the assembly of figure 1, said view being taken according
to line II-II in the previous figure. Best Mode of Carrying Out the Invention According to the ■ illustration, the invention is applied to the retreading of tires, each tire being defined by a carcass 10 with its external surface already abraded, clean and degreased, onto which is applied a connecting film 20 in a vulcanizable material, such as a rubber compound compatible with the material of the carcass and with that of a tread 30, which has been previously formed and vulcanized and which is placed on the connecting film 20. The tire thus formed is mounted in an adequate envelope 40, such as for example, that contemplated in the patent application PI9604105 of the same applicant, and then conducted to the inside of the heating chamber 51 of a reactor 50 that may be formed by the shell of an autoclave of the type normally used for retreading said tires by means of induction heating and which is dimensioned to receive, therewithin, about 10-20 tires to be retreaded, which are arranged side by side according to an alignment generally coaxial to the heating chamber 51.
According to the invention, the heating chamber 51 of the reactor 50 is provided with a plurality of microwave emitters 52, for example having an individual power of about 800 watts, which are adequately placed in the internal face of the reactor, in order to emit the microwaves in the radial direction, towards the connecting film 20, through the tread 30.
Due to the fact that the connecting film 20 has a molecular structure that is less cohered than that of the carcass 10, of the tread 30, and of the envelope 40, and is formed of a non-vulcanized rubber compound, submitting the assembly to the molecular agitation by
the microwaves will heat the connecting film 20 much more rapidly, making the latter reach the vulcanization temperature, which is maintained for the necessary time, with a minimum energetic consumption for heating the tire.
In order to maintain the microwave emitters 52 refrigerated during operation, ducts 53 containing a circulating refrigerant liquid, such as water or forced circulation air, may be provided. In case the reactor has its structure defined by a known autoclave, the ducts 53 for the circulation of liquid may be those employed for the circulation of hot air in the autoclave.
Claims
1. A device for the retreading of tires, each tire being formed by a carcass (10) with an abraded and clean peripheral surface, onto which is seated a connecting film (20) made of a vulcanizable rubber compound and externally covered by a previously formed and vulcanized tread (30) , characterized in that it comprises a reactor (50) defining a heating chamber (51) , which is dimensioned to receive a plurality of tires to be retreaded, and which is provided with a plurality of microwave emitters (52) placed along the internal face of the reactor (50) , in order to emit microwaves in the radial direction towards the connecting film (20) and through the tread (30) .
2. Device, as in claim 1, characterized in that the heating chamber (51) is provided with ducts (53) containing a circulating refrigerant liquid and arranged in order to keep the microwave emitters (52) refrigerated.
3. Process for the retreading of tires, each tire being formed by a carcass (10) with an abraded and clean peripheral surface, onto which is seated a connecting film (20) made of a vulcanizable rubber compound and externally covered by a previously formed and vulcanized tread (30) , characterized in that it comprises the steps of : mounting inside an envelope (40) , a respective carcass (10) carrying a connecting film (20) and a tread (30) ; placing a plurality of said envelopes (40) containing the respective tires to be retreaded inside a heating chamber (51) of a reactor (50) provided with a plurality of microwave emitters (52) ; - emitting microwaves in the radial direction towards the connecting film (20) and through the tread (30) , in order to heat the connecting film (20) up to the vulcanization temperature thereof; and
- maintaining the vulcanization temperature of the connecting film (20) until the vulcanization of the latter to both the carcass (10) and to the tread (30) has been concluded.
4. Process, as in claim 3, characterized in that the connecting film (20) has a less cohered molecular structure than that of the carcass (10) , of the tread (30) and of the envelope (40) .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/BR2001/000061 WO2002090092A1 (en) | 2001-05-04 | 2001-05-04 | A device and a process for the retreading of tires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/BR2001/000061 WO2002090092A1 (en) | 2001-05-04 | 2001-05-04 | A device and a process for the retreading of tires |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2002090092A1 true WO2002090092A1 (en) | 2002-11-14 |
Family
ID=3946497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BR2001/000061 WO2002090092A1 (en) | 2001-05-04 | 2001-05-04 | A device and a process for the retreading of tires |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2002090092A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008138081A1 (en) * | 2007-05-14 | 2008-11-20 | Julia Takahashi | Vulcanization process of rubber artifacts with application of premolded profile in autoclave with the use of microwaves |
| US7723323B2 (en) | 2003-04-11 | 2010-05-25 | High Point Pharmaceuticals, Llc | Pharmaceutical use of fused 1,2,4-triazoles |
| WO2010105316A1 (en) * | 2009-03-18 | 2010-09-23 | Julia Takahashi | Step of tire vulcanization in autoclave with induction heating system used for tire vulcanization/ retreading |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4157930A (en) * | 1976-10-04 | 1979-06-12 | Elektra Regummeringsteknik Aktiebolag | Method of retreading vehicle tires using microwave heating |
| US4536242A (en) * | 1982-05-12 | 1985-08-20 | Q & Q Retreading System Ab | Method and apparatus for retreading vehicle tires |
| US4557775A (en) * | 1982-01-20 | 1985-12-10 | Q & Q Retreading System Ab | Tie-gum layer for retreading vehicle tires |
| US5639414A (en) * | 1994-06-09 | 1997-06-17 | Sp Reifenwerke Gmbh | Method and apparatus of manufacturing pneumatic vehicle tires |
-
2001
- 2001-05-04 WO PCT/BR2001/000061 patent/WO2002090092A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4157930A (en) * | 1976-10-04 | 1979-06-12 | Elektra Regummeringsteknik Aktiebolag | Method of retreading vehicle tires using microwave heating |
| US4557775A (en) * | 1982-01-20 | 1985-12-10 | Q & Q Retreading System Ab | Tie-gum layer for retreading vehicle tires |
| US4536242A (en) * | 1982-05-12 | 1985-08-20 | Q & Q Retreading System Ab | Method and apparatus for retreading vehicle tires |
| US5639414A (en) * | 1994-06-09 | 1997-06-17 | Sp Reifenwerke Gmbh | Method and apparatus of manufacturing pneumatic vehicle tires |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7723323B2 (en) | 2003-04-11 | 2010-05-25 | High Point Pharmaceuticals, Llc | Pharmaceutical use of fused 1,2,4-triazoles |
| WO2008138081A1 (en) * | 2007-05-14 | 2008-11-20 | Julia Takahashi | Vulcanization process of rubber artifacts with application of premolded profile in autoclave with the use of microwaves |
| WO2010105316A1 (en) * | 2009-03-18 | 2010-09-23 | Julia Takahashi | Step of tire vulcanization in autoclave with induction heating system used for tire vulcanization/ retreading |
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