• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method of applying a rubber-based self-sealing composition to the inner surface of a tire casing (40) which takes its form of use under the effect of an internal air pressure comprising the steps of during which: - a non-crosslinked self-sealing composition is introduced into an extrusion means whose geometric and thermodynamic characteristics have been specially adapted, characterized in that: - the conditions of speed and temperature of the extrusion means are adjusted; so that, at the level of an application nozzle (30) forming the exit die of said extrusion means, the self-sealing composition is cross-linked and, - the application nozzle is applied to the internal surface of said envelope previously set relative movement relative to the application nozzle, and directly deposited a bead (41) extruded and crosslinked width and profile given on said inner surface of the envelope.
    公开号:FR3020982A1
    申请号:FR1454248
    申请日:2014-05-13
    公开日:2015-11-20
    发明作者:Stephane Barjon；Christian Beldent；Bruno Dussardier；Sarah Joandel
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；Michelin Recherche et Technique SA France；
    IPC主号:
    专利说明:

    [0001] The invention relates to the field of tire manufacturing, and more particularly to the field of tires comprising compositions with self-sealing properties used as a self-extinguishing material. anti puncture layer, and intended to fill the perforations thus avoiding the flattening of the tire in use. [2] These self-sealing compositions are defined by their physico-chemical properties, and are characterized in that they are able, under the effect of the internal pressure prevailing in the tire, to flow in the air flow paths to the outside, to seal and restore the seal. They must also be specially adapted to maintain a good dimensional stability under the effect of temperature variations, gravity forces or centrifugal forces, so as not to change the distribution of masses in the tire. [3] Many compositions capable of producing these effects are described in the state of the art, but could not really develop in tire tires for vehicles, especially for lack of stability over time or efficiency in extreme temperature conditions of use, or because of difficulties of manufacture and / or use of these self-sealing compositions. [004] Thus, to help maintain good efficiency at high temperature, US-A-4 113 799 (or FR-A-2 318 042) has proposed as a self-sealing layer a composition comprising a combination of butyl rubbers high and low molecular weights partially crosslinked, possibly in the presence of a small part of thermoplastic styrene elastomer. [005] US-A-4,228,839 has proposed as a self-sealing layer for a tire a rubber mixture containing a first radiation-degrading polymeric material, such as polyisobutylene, and a second polymeric material which cross-links by irradiation, preferably a butyl rubber. [6] US-A-4 426 468 has also proposed a self-sealing composition for a very high molecular weight, cross-linked butyl rubber tire. [7] However, butyl rubbers have the disadvantage of having significant hysteretic losses (a high level of Tan Ô) over a wide temperature spectrum, a disadvantage that affects the self-sealing compositions themselves with a strong increased hysteresis, and a noticeable decrease in the rolling resistance of pneumatic tires. [8] Also, alternatively, it may be advantageous to use for the same type of application self-sealing compositions based on unsaturated diene elastomer (natural rubber) which are described for example in US publications. These compositions are characterized by the combined presence of a high level of hydrocarbon resin as tackifying agent "tackifier", always greater than 100 parts by weight per hundred parts. In addition, a large amount of liquid elastomer gives a high fluidity to the composition which is a source of other disadvantages, in particular a risk of creep of the self-sealing composition when used at a relatively high temperature (typically higher than at 60 ° C) frequently encountered when using tires in certain geographical areas. [009] More promising, a composition free of butyl rubber, and significant amounts of hydrocarbon resin and liquid elastomer, is described in the publication FR 2 955 587 of the Applicant. This composition is based on a blend of a butadiene polybutadiene or copolymer elastomer and a synthetic rubber or synthetic polyisoprene elastomer (the weight ratio between the two elastomers being within a range from 10:90 to 90:10); a hydrocarbon resin (between 30 and 90 phr); and a charge (0 to less than 30 phr). [10] These compositions simultaneously contain a network of large and high molecular weight elastomeric chains, and a network of low molecular weight short elastomeric chains. In the crosslinked state, long-length elastomeric chains constitute a network capable of elastically gripping the shorter elastomeric chains and thus more conducive to maintaining their plastic properties. [11] All these compositions are characterized in that, in the uncrosslinked state, as in the crosslinked state, they exhibit a very high fluidity and tackiness (tack) in comparison with the rubber compositions traditionally entering the manufacture of tires. [012] Also, their implementation in common extrusion and assembly processes, is at the origin of a whole source of problems. [013] In particular, during the assembly process, the production and laying on a receiving surface of a profile having calibrated dimensional characteristics is particularly delicate in that the geometry of the profile can deform significantly under the effect of the mechanical stresses related to the handling and transfer of said profile, and such that the take-off of a support, the tensioning during laying etc ..... [14] The object of the invention is to to solve these difficulties by taking advantage of the rheological properties mentioned above, and that these materials may have under the effect of temperature or high mechanical stresses. [15] Thus, contrary to all the misconceptions about the shaping of extrusion products, it has been demonstrated that the high plasticity of self-sealing materials at high temperature allowed them to be shaped into a die. extrusion, while they are already in a very advanced phase of their crosslinking. [16] According to the invention, the method of laying a self-sealing composition based on rubber on the inner surface of an envelope which takes its form of use under the effect of an internal air pressure comprises the stages during which: a non-crosslinked self-sealing composition is introduced into an extrusion means whose geometric and thermodynamic characteristics have been specially adapted, the conditions of speed and temperature of the extrusion means are adjusted so that that, at an application nozzle forming the exit die of said extrusion means, the self-sealing composition is crosslinked and, - approaching the application nozzle of the inner surface of said casing previously put in motion relative to the application nozzle, and directly deposited an extruded and crosslinked bead of given width and profile on said inner surface of the envelope. [17] The shaping and the final removal inside the tire are done in a single step, which makes it possible to overcome all the intermediate handling phases of the product as is commonly practiced on a traditional process. 'assembly. [18] To assess the state of crosslinking of the self-sealing composition and its transition from the non-crosslinked state to the crosslinked state, the value of the ratio G "/ G '(Tg8) of the self-sealing composition and it is then ensured that this ratio decreases by a value greater than 0.1 and preferentially by a value greater than 0.2, when it passes from the non-crosslinked state to the crosslinked state [19] Preferably, the value of the ratio G "/ G '(Tg8) of the non-crosslinked self-sealing composition is between 1.2 and 3 and even more preferably between 1.25 and 2.5. [20] Preferably, the value of the ratio G "/ G '(Tg8) of the cross-linked self-sealing composition is between 0.66 and 2 and even more preferably between 0.80 and 1.4. [21] Advantageously, the properties of rheofluidity and of decreasing the temperature-dependent viscosity of the self-sealing composition are combined with the mode of supply of the calories so as to control the integrity of the elastomeric matrix being crosslinked in the extruder. Thus, the self-sealing composition used for the implementation of the invention has a shear-thinning behavior, it is therefore understood that its viscosity decreases with the increase in the shear rate applied to it in the extruder. application of the calories is then chosen so that the composition is crosslinked at the level of the exit die of the extruder. [22] Preferably, the extrusion means is formed by a screw of length (L) and diameter (D) rotated inside a sheath. [023] Preferably, the ratio (L / D) between the length and the diameter of the screw is between 15 and 30. [24] Preferably, the temperature and speed conditions of the extrusion means are adjusted so as to that the composition remains inside the extrusion means at a temperature between 150 ° C and 200 ° C for a time between lmin and 20m in, and preferably between 1 min and 6 min. [25] Preferably, the temperature and speed conditions of the extrusion means are adjusted so that the amount of thermal energy supplied to the self-sealing composition in the form of mechanical energy is less than 75% of the energy. total heat supplied to said self-sealing composition. [026] Preferably, the output speed of the self-sealing composition of the application nozzle is between 1 ms-1 and 4 ms-1. [027] Preferably, depositing the self-sealing composition, by winding said bead by varying the pitch and the axial position of the application nozzle relative to the tire casing. [28] Preferably, said bead is laid continuously by moving the application nozzle tangentially to the inner surface of the tire from the equator of the envelope to a first shoulder, then starting in the opposite direction towards a second shoulder opposite through the equator, and finally returning to the equator. [29] Preferably, the tire casing is in the vulcanized state. [30] As mentioned above, the self-sealing materials have very particular module characteristics making the evaluation of their state of vulcanization difficult. The term "vulcanization" here also means, and more generally by crosslinking, the formation of the bonds between the components of the elastomeric matrix and the elements of the vulcanization system. The most common crosslinking systems are sulfur-based systems, which will then be referred to as vulcanization, but the invention may also relate to other known crosslinking systems such as, for example, peroxide-based crosslinking systems. [31] The degree of crosslinking a, is calculated by measuring the amount of free sulfur, that is to say not bound to an elastomer chain. When all the free sulfur of the composition has been consumed, it is considered that the crosslinking / vulcanization is complete, and that the degree of crosslinking a is 100%. [32] By assimilation, the degree of crosslinking can be evaluated, at a given temperature, in this case at the process temperature of the process, by measuring the evolution of the stiffness of the composition using a rheometer, and comparing this rigidity with the maximum rigidity obtained by the self-sealing composition when it is considered to be completely cross-linked, that is to say when its rigidity no longer changes. [33] When the stiffness measurements are made with an oscillating chamber rheometer according to DIN 53529 (Part 3 (June 1983), where the measurements are processed according to DIN 53529 - Part 2 (March 1983), we shall consider by assimilation that the vulcanization is practically completed when the torque measured at the outlet of the application nozzle is at least equal to 80% of the maximum torque. [34] However, given the specificity of the self-sealing compositions which exhibit very low stiffness rate, it is difficult to accurately measure the vulcanization rate using the means described above. [035] Also, in the context of the invention that is the subject of the present description. , it is proposed to use substitute measures to assess the degree of crosslinking / vulcanization, by determining the value Tg8, which is the ratio of the viscous modulus and elastic modulus G "/ G '. [36] The method from me Of course, G 'and G "use an RPA type oscillating disk rheology apparatus, such as the 2000 device supplied by Alpha TechnologyTM Company, equipped with the standard 200 in.lbs (22.6 Nm) viscosity sensor. The RPA machine makes it possible to torsionally urge a sample of material enclosed in a chamber (or enclosure) with biconical walls. This method is described below with reference to the ISO 3417 standard of February 2009, which gives the preparation and test parameters for analyzing a vulcanization time of a sample in the rheometer and in which certain parameters have been modified to take into account account of the very low rigidity of self-sealing type mixtures. [37] To carry out the measurement, a sample of material approximately 30 mm in diameter and with a mass of approximately 6 g is deposited in the enclosure of the RPA (a total volume of 7 cm 3 is considered optimal; a small amount of sample escapes from each side of the enclosure and is visible at the end of the test). [38] At the end of this operation, the sample is perfectly molded in the closed enclosure of the RPA. [039] The sample is then brought to a set temperature directly in the chamber of the RPA. [040] It is then possible to start measuring the value of G 'and G "at a given alternating dynamic shear rate, and in a predefined frequency and temperature range. [41] In the case of self-contained compositions, shutters which are the subject of the present application, the measurement of the value of Tg8 is carried out at a temperature of 130 ° C., at an alternating deformation amplitude of 40% and for a frequency range of between 0.033 Hz and 1 Hz. The value used for measuring Tg8 is the value observed at a frequency of 0.033 Hz. [42] The self-sealing mixtures have the particularity of seeing the value of Tg8 decrease appreciably when they pass from the uncured state. in the vulcanized state, this reduction is at least 0.1 and generally greater than 0.2 [43] Thus, in the context of the invention and the present description, the term "self-sealing mixture" is used. uncrosslinked / unvulcanized, a mixture having a Tg8 value between 1.2 and 3 and preferably between 1.25 and 2.5. And, cross-linked / vulcanized self-sealing mixture is understood to mean a mixture having, at the outlet of the extrusion nozzle, a Tg8 value of between 0.66 and 2 and preferably of between 0.8 and 1.4. [44] The following description is intended to illustrate non-limitatively an example of implementation of the invention and is based on Figures 1 and 2 in which: Figure 1 shows a suitable extrusion device to implement the method according to the invention, - Figure 2 shows a distribution diagram of the heat input conferred to the self-sealing composition as a function of the flow rate and the rotational speed of the screw, - Figure 3 shows a diagram illustrating the rheofluidifying behavior of the self-sealing composition, in particular the variation of the viscosity with the shear rate at low temperature and its evolution with temperature. [45] Figure 1 shows an extrusion device adapted to implement the method according to the invention. This extrusion device mounted on a carrier frame 13 comprises a screw 20 driven in rotation in a sleeve 10 by a motor 12 and a gearbox 11. [46] The sleeve comprises upstream a feed zone 23 through which the car composition non-crosslinked barrier is introduced. A tamping roller 22 ensures a good regularity of the introduction of the mixture. [47] Downstream of the extrusion assembly, is disposed a conduit 31 opening on an application nozzle 30 of known type, and described by way of example in the publication EP 268 544 or in the publication EP 264 600. [48] The applicator nozzle is disposed opposite the inner surface of a tire 40 in rotation about its axis, so as to allow the successive winding of a cord 41 of the self-sealing composition, profile and thickness calibrated. An axial displacement movement in translation is printed at the nozzle in order to continuously deposit several cords 41 by slicing, the latter being connected to the output of the extruder by a flexible pipe. [49] The sheath 20 comprises heating means 21. These heating means are capable of regulating the temperature of the barrel over a range from 140 ° C. to 220 ° C. so as to maintain the temperature between 150 ° C. and 200 ° C. vs. [050] Preferentially, we will therefore choose means such as electrical resistors, a heat pipe specially adapted to operate at this temperature level, or means such as steam under pressure which will be observed here that they are more difficult to implement to regulate the temperature on the range considered. It is also possible to install heating means of the same kind as previously in the body of the screw to provide additional heat to the composition. [51] The crosslinking process of the self-sealing composition is related to several parameters corresponding as much to the configuration of the extrusion means as the rheology and the composition of the self-sealing mixture, which will be recalled below. the general principles. [52] It is indeed advisable to adjust the operating parameters of the extrusion device with discernment so that the energy provided to the composition during the transfer time is sufficient to obtain a crosslinked composition at the point of exit from the extrusion device. application nozzle 30. [053] The thermal evolution of the composition during its course inside the sheath is schematically represented by the diagram shown in FIG. 1. [54] The first zone A, close to the feeding area is intended to change the temperature of the composition of the introduction temperature, assimilated to the ambient temperature in the workshop, to the set temperature included, for most of the self-sealing compositions used, between 140 ° C and 220 ° C and preferably between 170 ° C and 200 ° C. [55] In steady state, the thermal input during the residence of the composition in the transfer zone B is relatively constant. [56] Finally, the passage of the composition in the conduit and in the application nozzle, corresponding to the extrusion zone C, wherein the composition knows a greater heating for a relatively short time. [57] The choice of the set temperature will depend on the first order of the speed of rotation of the screw, which will act on the one hand on the residence time of the composition inside the sleeve, which varies thermal inputs by conduction of the walls to the mixture, and secondly the mechanical energy occurring due to the friction and shearing of the mixture between the walls of the screw and the sheath and converted into thermal energy; for this purpose it is possible to adapt the air gap between the threads of the screw and the sleeve which defines the shearing undergone by the self-sealing composition. [58] For practical reasons, and in particular for mastering the cycle times, which may include stopping phases during which the screw is stopped, one can seek to increase the proportion of the mechanical energy converted into heat of in order to reduce the energy input during the stopping phases and not to excessively affect the vulcanization reaction due to the prolongation of the energy supply by contact with the walls whose thermal inertia is high. [59] However, it is not possible to allow the share of mechanical energy to grow beyond certain limits. Indeed, it has been shown that self-sealing mixtures are likely to lose their properties when they are subjected to excessive shear rates. Also, it will be ensured that the energy transmitted by the mechanical effects is less than 75% of the total of the thermal contribution conferred on the mixture. This limit, which is intended to reduce the effects of conduction, makes it possible to obtain relatively stable crosslinking states for cycle interruption times of up to about ten minutes. To adjust the heat input by conduction, it is possible, for example, to modify the height of the threads, the value of the exchange surface between the composition circulating in the body of the extrusion means and the heating elements of said means of extrusion. It is also possible to act on the set temperature of the heating means 21. [61] The diagram of FIG. 2, determined for the conditions of production and for a self-sealing composition as defined below, and in which plots the speed in abscissa and the abscissa the output flow, to illustrate the distribution of thermal inputs from the mechanical energy due to shear on the one hand and the energy provided by conduction by the walls on the other hand . These values were obtained with a screw speed of between 20 rpm and 120 rpm. [62] In view of the above, it will be readily apparent to those skilled in the art that the higher the speed of the screw, the higher the mechanical energy heating, and the lower the residence time in the machine. the extrusion means is important. By implementing appropriate experimental designs it is easy to determine the operating parameters for regulating this equilibrium. [63] It is also possible to adapt the length of the screw with respect to its diameter, so as to increase the residence time without penalizing the output flow. Considering a screw of diameter D and length L, the L / D ratio can usefully be between 15 and 30. [64] As an example of implementation of the method according to the invention, the following will be indicated: the set values obtained for a self-sealing composition whose composition is described in publication FR 2 955 587 of the applicant. This composition is based on a blend of at least two solid elastomers, a polybutadiene or butadiene copolymer elastomer and a synthetic rubber or synthetic polyisoprene elastomer (the weight ratio between the two elastomers being within a range of 10:90 to 90:10); a hydrocarbon resin (between 30 and 90 phr); and a charge (0 to less than 30 phr). [65] In an example of a self-sealing composition used for the implementation of the invention, this composition comprises a solid unsaturated diene elastomer (50 phr cutting of solid NR with 50 phr of solid BR, average molar mass in number Mn of the elastomer blend equal to about 270,000 g / mol in the final composition); a hydrocarbon resin "Escorez 2101" from Exxon Mobil (Tg equal to about 44 ° C., softening point equal to about 90 ° C., Mn equal to about 800 g / mol, lp equal to about 2.1) at a rate of weight of approximately 50 phr; about 15 phr of liquid polybutadiene elastomer ("Ricon 154" from Sartomer Cray Valley - Tg equal to about -20 ° C, Mn equal to about 5,000 g / mol and lp equal to about 1.4); 0.5 phr of sulfur combined with 0.5 phr of DPG; it also comprises a very small amount (about 1 phr) of carbon black (N772) and about 3 phr of antioxidant. [066] To obtain a composition whose Tg 6 value of the non-crosslinked material at the process inlet is 1.52, and whose Tg 6 value of the crosslinked material at the outlet of the nozzle is 1.15, the values Set point of the process parameters in stabilized mode were as follows: Example 1: Temperature: 150 ° C to 180 ° C Screw diameter: 120mm Screw length: 1800 mm Air gap screw / sleeve: 0.1mm Conduit length: 500mm Section nozzle outlet: 30mm2 Ratio of screw-sleeve exchange surfaces: 0.5 Flow rate: 1.5 Kg / min Conduction / self-heating ratio: 1 / 3-2 / 3 Average residence time: 8min Example 2 : Temperature: 150 ° C to 200 ° C Screw diameter: 120mm Screw length: 1800 mm Air gap screw / sleeve: 0.1mm Conduit length: 2300mm Nozzle outlet section: 20mm2 Ratio of screw-sleeve exchange surfaces : 0.5 Flow rate: 3 Kg / min Conduction / self-heating ratio: 1 / 3-2 / 3 Average residence time: 4min35 [67] The flow diagram FIG. 3 illustrates the rheofluidifying behavior of the self-sealing composition used for the implementation of the process of the invention in which the variation of the viscosity with the shear rate at low temperature and its evolution with temperature is noted. Thus, it is observed that the viscosity decreases as the speed gradient increases, which gives a more and more fluid material. It is understood that other vulcanizable self-sealing compositions can be used with the process of the invention as soon as they exhibit an equivalent rheofluidifying behavior. [68] Of course, it is also possible to implement the method according to the invention using known extrusion devices, different from that used as a basis for this description. By way of example, an injection molding machine can be used, and the equilibrium between the calories provided by a heating means placed around the intake pot, and the mechanical energy transmitted to the composition during the transfer in the duct and in the nozzle. The adjustment of the parameters of this device may seem easier, but it nevertheless proves costly in cycle time insofar as most of the thermal input is by the conduction of the walls of the cylinder. [70] The removal of the self-sealing product on the inner surface of the tire is operated in a known manner by cutting a continuous bead by approaching the outlet of the application nozzle 30 of said surface, after having previously put the latter rotation and, in a defined step, by moving the nozzle tangentially to the inner surface corresponding to a direction substantially parallel to the axis of the tire. The bead formed at the outlet of the application nozzle is thus deposited directly on the inner surface of the tire. [71] The width and thickness of the cord can be adjusted to reduce the exposure time. Good results seem to be obtainable by forming a bead having a width of between 10 and 20 mm and a thickness of between 1 and 2 mm. [72] In order to improve the visual perception of this winding, it is proposed to make the application nozzle undergo a continuous and alternating axial movement, starting from the equator of the envelope while moving towards the shoulder zone. , then starting in the opposite direction towards the opposite shoulder 43 while passing by the equator, and finally returning to the level of the equator. [073] The advantage of the method according to the invention is also to be able to deposit a layer of self-sealing mixture directly on the inner surface of the tire regardless of the step of producing the latter, and in particular when the tire is completely vulcanized, as is the case, for example, in warehouses for the delivery of tires. This way of proceeding makes it possible to differentiate tires at the last moment, according to the use options specified by a given customer. In which case, the extrusion means are arranged in the delivery warehouse and are placed for the use of the operators responsible for organizing the orders.
    权利要求:
    Claims (13)
    [0001]
    CLAIMS1) A method of laying a rubber-based self-sealing composition on the inner surface of a tire casing (40) which takes its form of use under the effect of an internal air pressure comprising the steps in which: - a non-crosslinked self-sealing composition is introduced into an extrusion means whose geometrical and thermodynamic characteristics have been specially adapted, characterized in that: the conditions of speed and temperature of the medium are adjusted; extrusion so that, at an application nozzle (30) forming the exit die of said extrusion means, the self-sealing composition is cross-linked and, - the application nozzle is approached from the internal surface of said envelope previously set in relative motion relative to the application nozzle, and directly deposited an extruded and crosslinked bead (41) of a given width and profile on said internal surface of the env. eloped.
    [0002]
    2) laying method according to claim 1 wherein the value of the ratio G "/ G '(Tg8) of the self-sealing composition decreases by a value greater than 0.1 and preferably a value greater than 0.2 when it passes from the uncrosslinked state to the crosslinked state.
    [0003]
    3) laying method according to claim 2, wherein the value of the ratio G "/ G '(Tg8) of the non-crosslinked self-sealing composition is between 1.2 and 3 and preferably between 1.25 and 2.5 .
    [0004]
    4) laying method according to one of claims 2 or 3, wherein the value of the ratio G "/ G '(Tg8) of the cross-linked self-sealing composition is between 0.66 and 2 and preferably between 0 , 80 and 1.4.
    [0005]
    5) The laying method according to one of the preceding claims, wherein the properties of rheofluidity and decrease of the viscosity depending on the temperature of the self-sealing composition are combined with the calorie supply mode so as to control the temperature. integrity of the elastomeric matrix being crosslinked in the extruder.
    [0006]
    6) laying method according to one of claims 1 to 5, wherein the extrusion means is formed by a screw (20) of length (L) and diameter (D) rotated inside of a sheath (10).
    [0007]
    7) A method of laying according to claim 6, wherein the ratio (LJD) between the length and the diameter of the screw is between 15 and 30.
    [0008]
    8) laying method according to one of claims 1 to 7, wherein the temperature and speed conditions of the extrusion means are adjusted so that the composition remains inside the extrusion means at temperature between 150 ° C and 200 ° C for a time between lmin and 20min and preferably between 1 min and 6 min.
    [0009]
    9) laying method according to one of claims 1 to 8, wherein the temperature and speed conditions of the extrusion means are adjusted so that the amount of thermal energy supplied to the self-sealing composition in the form of mechanical energy is less than 75% of the total thermal energy provided to said self-sealing composition.
    [0010]
    10) A method of laying according to one of claims 1 to 9, wherein the output speed of the self-sealing composition of the application nozzle (30) is between 1ms-1 and 4ms-1.
    [0011]
    11) laying method according to one of claims 1 to 10, wherein depositing the self-sealing composition, by winding said bead (41) by varying the pitch and the axial position of the nozzle application relative to the tire envelope.
    [0012]
    12) A method of laying according to claim 11, wherein said bead is laid continuously by moving the application nozzle (30) tangentially to the inner surface of the tire from the equator of the envelope to a first shoulder (42). ), then starting in the opposite direction towards a second opposite shoulder (43) through the equator, and finally returning to the equator.
    [0013]
    13) Laying method according to one of claims 1 to 12 wherein the tire casing is in the vulcanized state.
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    BE396699A|
    同族专利:
    公开号 | 公开日
    FR3020982B1|2016-06-24|
    EP3142848B1|2018-04-25|
    US10730255B2|2020-08-04|
    US20170080655A1|2017-03-23|
    CN106457704A|2017-02-22|
    EP3142848A1|2017-03-22|
    WO2015173120A1|2015-11-19|
    CN106457704B|2018-11-09|
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    法律状态:
    2015-05-21| PLFP| Fee payment|Year of fee payment: 2 |
    2015-11-20| PLSC| Publication of the preliminary search report|Effective date: 20151120 |
    2016-05-20| PLFP| Fee payment|Year of fee payment: 3 |
    2017-05-23| PLFP| Fee payment|Year of fee payment: 4 |
    2018-05-22| PLFP| Fee payment|Year of fee payment: 5 |
    2020-02-14| ST| Notification of lapse|Effective date: 20200108 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1454248A|FR3020982B1|2014-05-13|2014-05-13|METHOD FOR INSTALLING A SELF-SEALING PRODUCT ON THE INTERNAL SURFACE OF A PNEUMATIC|FR1454248A| FR3020982B1|2014-05-13|2014-05-13|METHOD FOR INSTALLING A SELF-SEALING PRODUCT ON THE INTERNAL SURFACE OF A PNEUMATIC|
    EP15722514.5A| EP3142848B1|2014-05-13|2015-05-07|Method for placing a self-sealing product on the inner surface of a tyre|
    PCT/EP2015/060118| WO2015173120A1|2014-05-13|2015-05-07|Method for placing a self-sealing product on the inner surface of a tyre|
    US15/310,672| US10730255B2|2014-05-13|2015-05-07|Method for placing a self-sealing product on the inner surface of a tire|
    CN201580024608.0A| CN106457704B|2014-05-13|2015-05-07|The method of self sealss product is set on the inner surface of tire|
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