CN105922821A - All-steel radial tyre for improving the load performance and manufacturing process thereof - Google Patents
All-steel radial tyre for improving the load performance and manufacturing process thereof Download PDFInfo
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- CN105922821A CN105922821A CN201610172691.2A CN201610172691A CN105922821A CN 105922821 A CN105922821 A CN 105922821A CN 201610172691 A CN201610172691 A CN 201610172691A CN 105922821 A CN105922821 A CN 105922821A
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- infantees
- glue
- steel wire
- carcass
- steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/02—Carcasses
-
- 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)
- B29D30/08—Building tyres
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
The invention discloses an all-steel radial tyre for improving the load performance and a manufacturing process thereof. a cushion rubber pad is adhered to the inner side of a carcass; a wire wrapping cloth is adhered to outer side of carcass; a wire wrapping cloth glue, a wire wrapping cloth edge and a wire wrapping cloth application are connected into an integral structure; and both sides of steel wire cloth are respectively are adhered to inner nylon wrapping cloths and outer nylon wrapping cloths. A lower fill rubber and a wire ring composite piece are sent to a specified position of a carcass tube enclosure by wire wrapping cloths; the carcass is packaged and sealed; the packaged carcass tube is subjected to back-packaging sealing by the upper fill rubber; a rubber pad is arranged outside the carcass tube after back-packaging; and the sidewall rubber is arranged on the outer side of the rubber pad. With a novel large diameter forming process, the all-steel radial tyre has the characteristics of high precision, high efficiency, and high degree of automation, can effectively improve the load performance of the tire, reduce the ring heat, avoid early tire damage, prevent breach of the adhesive material, and effectively solve the early damage symptom due to disengaging of carcass and filling glue.
Description
Technical field
The invention belongs to all-steel radial tyre production technical field, be specifically related to a kind of all-steel radial tyre for improving load performance and manufacturing process thereof.
Background technology
Load performance: tire can the ability that normally travels of bearing load, referred to as load performance.Tire can normally travel by bearing load, is one of the basic function of tire, and the size of bearing load is also called load performance.The load performance of every kind of specification tyre is relevant to air pressure, and the load of such as common British system specification calculates:
L=K × 0.425 × (P-15)0.585×S0.625 1.39×(Dr+S0.625)
Wherein L is single tire load (kg), and P is air pressure (kPa)
Calculating according to standard pressure that obtain is standard list tire load, the use load of tire should be under single tire load.
According to GB/T 2977, the use load of tire is also relevant to operating speed, and under the conditions of low speed uses, tyre load can improve, can be higher by 25% than standard list tire load under 40km/h.Speed is the lowest, and load performance is the highest.
Tyre load is the highest, and it deforms the biggest in travelling, heat is the highest, easily damages in circle portion.The existing all-steel radial tyre overwhelming majority is only applicable under gauge load use, easily at circle portion earlier period damage in the case of load height.
The existing all-steel radial tyre overwhelming majority is only applicable under gauge load use, and the tire that load performance is higher is tubed tyre, the present invention be directed to tubed tyre.
Tubed tyre improves load performance, mostly using the construction design method that nylon infantees strengthens, common nylon infantees Enhancement Method has 3 kinds (such as the 1st kind of reinforcement Structure Figure in accompanying drawing, the 2nd kind of reinforcement Structure Figure, the 3rd kind of reinforcement Structure Figure).1st kind of reinforcement, nylon infantees covers whole carcass ply and the anti-package part of steel wire infantees, and upwardly extends relatively big, becomes an entirety with sidewall.Sidewall rubber is isotropic material, after sticking on nylon infantees, becomes anisotropic material, big especially along nylon cord direction intensity, has been greatly reinforced tear-resistant, warping strength performance, can be effectively prevented sidewall rubber tear, thus prevent rim of the mouth from splitting.The crackle that this reinforcement way is formed because of continuous Compression and Expansion for steel wire and rubber at carcass ply anti-package end points has a better role.But crackle still can postpone to produce, and still can expand, become bead separation after generation.
2nd kind of reinforcement, improves bag height in steel wire infantees, strengthens circle portion rigidity, reduce the deformation of circle portion.Interior bag is the highest, deflects very big at interior bag end points, the easiest rim of the mouth implosion, therefore uses bag end points in two-layer nylon infantees banding steel wire infantees.
3rd kind of reinforcement, all adds nylon infantees at bag, anti-package end points in steel wire infantees, improve this at two warping strength, shear, the ability of Compression and Expansion deformation.The elastic modelling quantity of nylon infantees is between steel wire and rubber, it is possible to effectively alleviate stress, reduces strain, reduces heat, thus improves resistance to load.
But, although these 3 kinds of nylon Strengthening Technologies have the requirement of certain effect, the most not up to user for improving load performance, in the case of travel speed is slightly higher, earlier period damage is a lot.
These 3 kinds of technology use one-stage building process to produce, and once-through method molding uses aeration settling and anti-package, and positioning parts can change after anti-package.Domestic also have the tire construction (such as the 4th kind of reinforcement Structure Figure in accompanying drawing, the 5th kind of reinforcement Structure Figure) using secondary method moulding process to produce.4th kind of reinforcement, steel wire infantees turn up height is higher than carcass anti-package, has a block-type glue for separating two anti-package end points, it is possible to buffer the shearing force between two anti-package end points between steel wire infantees and carcass.Just because of there being a block-type glue between steel wire infantees and carcass, using once-through method craft type glue inflation anti-package to deform, therefore using secondary method technique.5th kind of reinforcement, is also to use secondary method technique, has sticked on 2 layers of nylon infantees in steel wire infantees at bag end points.
Existing nylon Strengthening Technology, it is to use one-stage building process to produce mostly, the setting of once-through method radial-type tyre forming process parameter and physical unit location are the most notable on the impact of end product quality, each positioning parts and transmission ring location on assembly drum, it is susceptible to deviation, causing the mass defects such as infantees displacement, anti-package deviation, serious presses the unreal or phenomenon such as position skew, framework material stretcher strain when possibly even can cause molding.Changing frequent, inter-continuation production plus forming machine due to tire specification, device parameter is also required to often be adjusted, and frame for movement is more complicated, and moving component is many, easily breaks down and positioning parts precision is inadequate, directly affect product quality.The tire used under load higher strip part is higher to technological requirement, and the deviation of positioning parts can directly result in the earlier period damage of tire.
4th kind, the 5th kind reinforcement way of existing employing secondary method moulding process, its nylon infantees is fitted around wire loop, and during molding, wire loop base material is too much, easily chokes with resentment, make tire earlier period damage when positive closure and anti-package.
Summary of the invention
For problems of the prior art, it is an object of the invention to provide a kind of all-steel radial tyre for improving load performance and manufacturing process thereof, use brand-new structure and manufacturing process, be big footpath moulding process, be also the one of secondary method production technology, it is applied to the tire that load performance is higher, under the conditions of the use that load is higher, reduce construction design method and the manufacturing process of wheel bead part deformation, deform by reducing wheel bead part, reduce circle portion heat, it is to avoid tire earlier period damage.
The technical scheme that the present invention takes is:
A kind of all-steel radial tyre for improving load performance, including carcass, steel wire infantees, interior outsourcing nylon bag cloth, breaker strip, steel wire infantees type glue, steel wire infantees bound edge, upper filling glue, lower filling glue and wire loop composite members, pad glue, sidewall rubber, inside described carcass, laminating is provided with breaker strip, outside carcass, laminating is provided with steel wire infantees, steel wire infantees type glue, steel wire infantees bound edge is applied ointment or plaster with steel wire infantees respectively and is connected as one formula structure, fit respectively and be provided with interior bag nylon infantees and outsourcing nylon infantees in the both sides of steel wire infantees, lower filling glue is pushed on the matrix body tube that steel wire infantees enclosing becomes the position specified with wire loop composite members, carcass positive closure seals, matrix body tube after positive closure carries out anti-package sealing by upper filling glue, pad glue it is provided with outside matrix body tube after anti-package, it is provided with sidewall rubber outside pad glue.
Further, the structure that in described steel wire infantees uses, bag is higher.
Further, described interior bag nylon bag cloth is set to 2 layers of infantees structure, covers bag end points in steel wire infantees；Described outsourcing nylon bag cloth is set to 2 layers of infantees structure, covers steel wire infantees outsourcing end points.
Further, described breaker strip is arranged on carcass and fills between glue, and the width of breaker strip is set to 60mm.
Further, described steel wire infantees type glue is arranged between steel wire infantees and carcass anti-package, and steel wire infantees type glue, pad glue, upper filling glue and sidewall rubber all use flat drum laminating type.
Further, described steel wire infantees bound edge can be replaced nylon infantees bound edge or film bound edge, and bound edge width is set to 50mm.
Further, described lower filling glue and wire loop composite members, be that the composite filled glue of once-through method technique is divided into upper filling glue and lower filling glue two parts, lower filling glue pre-with wire loop compound after, positive closure refer to that sheet is pushed on matrix body tube.
The manufacturing process of a kind of all-steel radial tyre for improving load performance, specifically includes following steps:
(1) matrix body tube molding first paragraph: first type glue and wear-resisting glue composite members applied ointment or plaster on the flat drum in big footpath, then installs inner liner, then pressing outsourcing nylon infantees and Nei Bao nylon infantees；
(2) matrix body tube molding second segment: together with steel wire infantees type glue is applied ointment or plaster with steel wire infantees in advance with steel wire infantees bound edge, breaker strip is applied ointment or plaster in advance on carcass, and pretreated steel wire infantees is fitted in the position specified, carcass of then fitting；
(3) the 3rd section of positive closure and anti-package of matrix body tube molding: positive closure refers to that lower filling glue and wire loop composite members are pushed to matrix body tube specifies position, then positive closure is carried out, then glue is filled on, then anti-package sealing is carried out, fitting pad glue outside matrix body tube after anti-package again, sidewall rubber of fitting outside pad glue；
(4) matrix body tube transfer: matrix body tube is transferred to setting drum sizing, the spacing of setting drum two wire loop is equal to the spacing of anti-package upper two wire loops of drum；
(5) belt component laminating and transfer: fit on belt drum belt and crown, posts and transfers to setting drum afterwards, crown center and matrix body tube center superposition；
(6) sizing pressing: matrix body tube and belt drum assembly centering are filled with the sizing of 120kPa air pressure, pressing crown, fetus produces and terminates.
Further, the outsourcing nylon infantees in described step (1) uses chi structure, and intersecting angle is set to 52 °, and does not extend to below wire loop and inner side.
Further, bulging diameter 60mm bigger than wire loop internal diameter is put down in the big footpath in described step (1).
The invention have the benefit that
1, the present invention uses big footpath moulding process, one section, two-stage nitration separation can be realized, and fit and mechanical press on real drum in flat drum location, there is high accuracy, high efficiency, feature that automaticity is high, carcass uses big footpath moulding process, carcass length is longer by 20% than once-through method technique, and the radical that wheel tyre cavity carcass cord uses is many, can be effectively improved tyre load performance.
2, laminating drum diameter 60mm bigger than wire loop internal diameter, the biggest footpath moulding process laminating drum is compared with once-through method molding laminating drum diameter big about 10%, post carcass extended length, carcass ply expansion rate is little, can more body cord be accomplished in tire, both can improve carcass ply density and carcass strength, tire capacity can have been improved again.
3, the present invention uses and posts nylon infantees bound edge at steel wire infantees outsourcing end points, infantees type glue is posted between steel wire infantees and carcass anti-package, inside and outside steel wire infantees, the structure of nylon infantees is respectively pasted at two ends, bag nylon infantees uses 2 layers of design, the stress at steel wire infantees anti-package end points can be buffered concentrate, outsourcing nylon infantees does not extend to bottom wire loop, wire loop base material anti-package can be made to be easier to, pressing is tightr, the 4th kind can be avoided, choke with resentment phenomenon in circle portion in 5th kind of reinforcement mode, it is not easy to choke with resentment, avoid wire loop to choke with resentment and cause tire earlier period damage；Interior bag nylon infantees uses 2 layers of design, covers bag end points in steel wire infantees, is possible to prevent sizing material breach.
4, the design that in the steel wire infantees of the present invention uses, bag is higher, it is possible to effectively lifting wheel bead part rigidity, circle portion deforms little when tire running；Breaker strip design between carcass and filling glue, carcass can be eliminated and the stress filled between glue is concentrated, reduce heat, can i.e. can effectively solve the problem that in tire used carcass with the fault avoiding the 4th kind, in use glue core is de-in early days in the 5th kind of reinforcement mode and fill the earlier period damage symptom that glue departs from.
5, body piles, enhancement Layer, type glue/composite members anti-package position, rim of the mouth all use tire base on-inflatable disposable anti-package technique, it is to avoid there is angle and bead part carcass metaboly between carcass anti-package and carcass and carcass anti-package and enhancement Layer endpoint location resist the impact subduing strain property.
6, the present invention realizes the parts flat drum layer patches such as liner, wear-resisting glue/type glue, glue core composite members, sidewall/pad glue, and tire section material is distributed more accurate, and component joints degree of agreement is higher, and the bubble retained in tire base is less, and finished product uniformity is high.Steel wire infantees type glue, pad glue, upper filling glue and sidewall rubber all use flat drum laminating type, it is ensured that accurate positioning；Steel wire infantees type glue, between steel wire infantees and carcass anti-package, can eliminate the stress between carcass and steel wire infantees anti-package and concentrate, reduce heat.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention；
Fig. 2 is the 1st kind of reinforcement Structure Figure in prior art；
Fig. 3 is the 2nd kind of reinforcement Structure Figure in prior art；
Fig. 4 is the 3rd kind of reinforcement Structure Figure in prior art；
Fig. 5 is the 4th kind of reinforcement Structure Figure in prior art；
Fig. 6 is the 5th kind of reinforcement Structure Figure in prior art；
Wherein, 1, carcass；2, steel wire infantees；3, interior bag nylon infantees；4, breaker strip；5, upper filling glue；6, steel wire infantees type glue；7, outsourcing nylon infantees；8, steel wire infantees bound edge；9, sidewall rubber；10, pad glue；11, lower filling glue and wire loop composite members.
Detailed description of the invention
Further illustrate the present invention below in conjunction with the accompanying drawings.
nullAs shown in Figure 1，A kind of all-steel radial tyre for improving load performance，Including carcass 1、Steel wire infantees 2、Interior outsourcing nylon bag cloth 7、Breaker strip 4、Steel wire infantees type glue 6、Steel wire infantees bound edge 8、Upper filling glue 5、Lower filling glue and wire loop composite members 11、Pad glue 10、Sidewall rubber 9，Inside described carcass 1, laminating is provided with breaker strip 4，Described breaker strip 4 is arranged on carcass 1 and fills between glue，And the width of breaker strip 4 is set to 60mm，Outside carcass 1, laminating is provided with steel wire infantees 2，Steel wire infantees 2 uses the structure that interior bag is higher，Steel wire infantees type glue 6、Steel wire infantees bound edge 8 is applied ointment or plaster with steel wire infantees 2 respectively and is connected as one formula structure，Fit respectively and be provided with interior bag nylon infantees 3 and outsourcing nylon infantees 7 in the both sides of steel wire infantees 2，Interior bag nylon infantees 3 is set to 2 layers of infantees structure，Cover bag end points in steel wire infantees 2；Described outsourcing nylon infantees 7 is set to 2 layers of infantees structure, cover steel wire infantees 2 outsourcing end points, lower filling glue is pushed on the carcass 1 that steel wire infantees 2 enclosing becomes the position specified with wire loop composite members 11, carcass 1 positive closure seals, carcass after positive closure 1 carries out anti-package sealing by upper filling glue 5,1 outside of carcass after anti-package is provided with pad glue 10, is provided with sidewall rubber 9 outside pad glue 10.
Above-mentioned steel wire infantees type glue 6 is arranged between steel wire infantees 2 and carcass 1 anti-package, and steel wire infantees type glue 6, pad glue 10, upper filling glue 5 and sidewall rubber 9 all use flat drum laminating type.
Above-mentioned steel wire infantees bound edge 8 can be replaced nylon infantees bound edge or film bound edge, and bound edge width is set to 50mm.
Above-mentioned lower filling glue and wire loop composite members 11, be that the composite filled glue of once-through method technique is divided into upper filling glue 5 and lower filling glue two parts, lower filling glue pre-with wire loop compound after, positive closure refer to that sheet is pushed on carcass 1.
The manufacturing process of a kind of all-steel radial tyre for improving load performance, specifically includes following steps:
(1) 1 molding first paragraph of carcass: first type glue 10 and wear-resisting glue composite members are applied ointment or plaster on the flat drum in big footpath, bulging diameter 60mm bigger than wire loop internal diameter is put down in big footpath, then inner liner is installed, pressing outsourcing nylon infantees 7 and Nei Bao nylon infantees 3 again, outsourcing nylon infantees 7 uses chi structure, intersecting angle is set to 52 °, and does not extend to below wire loop and inner side；
(2) 1 molding second segment of carcass: together with steel wire infantees type glue 6 is applied ointment or plaster with steel wire infantees 2 in advance with steel wire infantees bound edge 8, breaker strip 4 is applied ointment or plaster in advance on carcass 1, pretreated steel wire infantees 2 is fitted in the position specified, then laminating carcass 1；
(3) the 3rd section of positive closure and anti-package of 1 molding of carcass: positive closure refers to that lower filling glue and wire loop composite members 11 are pushed to carcass 1 specifies position, then positive closure is carried out, then upper filling glue 5, then anti-package sealing is carried out, carcass after anti-package 1 outside fitting pad glue 10 again, sidewall rubber 9 of fitting outside pad glue 10；
(4) carcass 1 transfer: carcass 1 is transferred to setting drum sizing, the spacing of setting drum two wire loop is equal to the spacing of anti-package upper two wire loops of drum；
(5) belt component laminating and transfer: fit on belt drum belt and crown, posts and transfers to setting drum afterwards, crown center and 1 center superposition of carcass；
(6) sizing pressing: carcass 1 and belt drum assembly centering are filled with the sizing of 120kPa air pressure, pressing crown, fetus produces and terminates.
The above is not limitation of the present invention; it is noted that, for those skilled in the art; on the premise of without departing from essential scope of the present invention, it is also possible to making some changes, retrofit, add or replace, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. the all-steel radial tyre being used for improving load performance, it is characterised in that include carcass, steel wire bag
Cloth, interior outsourcing nylon bag cloth, breaker strip, steel wire infantees type glue, steel wire infantees bound edge, upper filling glue,
Lower filling glue and wire loop composite members, pad glue, sidewall rubber, inside described carcass, laminating is provided with breaker strip,
Outside carcass laminating be provided with steel wire infantees, steel wire infantees type glue, steel wire infantees bound edge respectively with steel wire infantees
Applying ointment or plaster and connect as one formula structure, fits respectively and is provided with interior bag nylon infantees and outsourcing in the both sides of steel wire infantees
Nylon infantees, lower filling glue is pushed to wire loop composite members to specify on the matrix body tube that steel wire infantees enclosing becomes
Position, carcass positive closure seals, and the matrix body tube after positive closure carries out anti-package sealing, after anti-package by upper filling glue
It is provided with pad glue outside matrix body tube, outside pad glue, is provided with sidewall rubber.
A kind of all-steel radial tyre for improving load performance, it is characterised in that
Described steel wire infantees wraps higher structure in using.
A kind of all-steel radial tyre for improving load performance, it is characterised in that
Described interior bag nylon bag cloth is set to 2 layers of infantees structure, covers bag end points in steel wire infantees；Described outsourcing
Nylon bag cloth is set to 2 layers of infantees structure, covers steel wire infantees outsourcing end points.
A kind of all-steel radial tyre for improving load performance, it is characterised in that
Described breaker strip is arranged on carcass and fills between glue, and the width of breaker strip is set to 60mm.
A kind of all-steel radial tyre for improving load performance, it is characterised in that
Described steel wire infantees type glue is arranged between steel wire infantees and carcass anti-package, steel wire infantees type glue, pad glue, on
Fill glue and sidewall rubber all uses flat drum laminating type.
A kind of all-steel radial tyre for improving load performance, it is characterised in that
Described steel wire infantees bound edge can be replaced nylon infantees bound edge or film bound edge, and bound edge width is set to 50mm.
A kind of all-steel radial tyre for improving load performance, it is characterised in that
Described lower filling glue and wire loop composite members, be the composite filled glue of once-through method technique is divided into upper filling glue with
Lower filling glue two parts, lower filling glue and wire loop pre-compound after, positive closure refer to that sheet is pushed on matrix body tube.
8. the manufacturing process being used for improving the all-steel radial tyre of load performance, it is characterised in that specifically wrap
Include following steps:
(1) matrix body tube molding first paragraph: first type glue and wear-resisting glue composite members are applied ointment or plaster on the flat drum in big footpath, then
Inner liner, then pressing outsourcing nylon infantees and Nei Bao nylon infantees are installed；
(2) matrix body tube molding second segment: steel wire infantees type glue and steel wire infantees bound edge are applied ointment or plaster with steel wire infantees in advance
Together, breaker strip is applied ointment or plaster in advance on carcass, and pretreated steel wire infantees is fitted in the position specified,
Then fit carcass；
(3) the 3rd section of positive closure and anti-package of matrix body tube molding: positive closure refers to be pushed to lower filling glue with wire loop composite members
Matrix body tube specifies position, then carries out positive closure, then on fill glue, then carry out anti-package sealing, then instead
Fitting pad glue outside matrix body tube after bag, sidewall rubber of fitting outside pad glue；
(4) matrix body tube transfer: matrix body tube is transferred to setting drum sizing, and the spacing of setting drum two wire loop is equal to
The spacing of anti-package upper two wire loops of drum；
(5) belt component laminating and transfer: fit on belt drum belt and crown, posts and turns afterwards
Move on to setting drum, crown center and matrix body tube center superposition；
(6) sizing pressing: matrix body tube and belt drum assembly centering are filled with 120kPa air pressure and shape, pressing crown,
Fetus produces and terminates.
A kind of manufacturing process of the all-steel radial tyre for improving load performance,
It is characterized in that, the outsourcing nylon infantees in described step (1) uses chi structure, and intersecting angle is set to
52 °, and do not extend to below wire loop and inner side.
A kind of manufacturing process of the all-steel radial tyre for improving load performance,
It is characterized in that, bulging diameter 60mm bigger than wire loop internal diameter is put down in the big footpath in described step (1).
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| CN201610172691.2A CN105922821B (en) | 2016-03-24 | 2016-03-24 | A kind of all-steel radial tyre and its manufacturing process for being used to improve load performance |
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Cited By (7)
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| CN107719029A (en) * | 2016-12-10 | 2018-02-23 | 赛轮金宇集团股份有限公司 | The all steel tubeless meridian tire and its manufacture method of a kind of high-load performance |
| CN109733128A (en) * | 2019-01-17 | 2019-05-10 | 宁夏神州轮胎有限公司 | Be all-trans pack arrangement on a kind of all steel tire sidewall |
| CN110001303A (en) * | 2019-05-07 | 2019-07-12 | 江苏通用科技股份有限公司 | The strengthening course end construction of all-steel load-bearing radial tire |
| CN110406329A (en) * | 2019-08-01 | 2019-11-05 | 江苏通用科技股份有限公司 | A kind of staged tyre bead type glue buffer layer |
| CN114603897A (en) * | 2022-05-07 | 2022-06-10 | 赛轮(东营)轮胎股份有限公司 | Secondary forming process for load-carrying all-steel radial tire |
| CN115195171A (en) * | 2022-07-06 | 2022-10-18 | 赛轮集团股份有限公司 | Production method of heavy-duty tire |
| CN115848070A (en) * | 2023-02-23 | 2023-03-28 | 广饶县计量测试检定所(广饶县产品质量检验所、广饶县橡胶轮胎产品与材料质量检验中心) | Tire bead part capable of improving performance of bead part, tire and inspection method |
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