WO2005118269A1 - A process for producing a non-pneumatic hollow tyre and a specific extrusion mandrel therefor - Google Patents

A process for producing a non-pneumatic hollow tyre and a specific extrusion mandrel therefor Download PDF

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Publication number
WO2005118269A1
WO2005118269A1 PCT/CN2004/001448 CN2004001448W WO2005118269A1 WO 2005118269 A1 WO2005118269 A1 WO 2005118269A1 CN 2004001448 W CN2004001448 W CN 2004001448W WO 2005118269 A1 WO2005118269 A1 WO 2005118269A1
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Prior art keywords
core
controlled
tyre
extruder
mold
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PCT/CN2004/001448
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French (fr)
Chinese (zh)
Inventor
Mingjiang Wang
Original Assignee
Mingjiang Wang
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Application filed by Mingjiang Wang filed Critical Mingjiang Wang
Priority to JP2007600020U priority Critical patent/JP3141035U/en
Publication of WO2005118269A1 publication Critical patent/WO2005118269A1/en

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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)
    • B29D30/08—Building tyres
    • 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
    • B29D2030/088—Building tyres by using a seamless tubular component, e.g. an inner liner, a carcass structure or a belt/breaker during tyre manufacturing on a core or a building drum

Definitions

  • the invention relates to a tire production process, in particular to a non-inflatable hollow tire production process and a special mold core.
  • the wheels and tires used by people are composed of inner tubes and outer tubes.
  • the role of the outer tube is abrasion resistance and pressure bearing.
  • the inner tube functions as gas storage. Therefore, the inner tube is made of rubber in order to prevent leakage of the filled gas.
  • Inflatable mouth; tires are made of cord and rubber for wear resistance and pressure.
  • the production process of the tire is as follows: firstly wipe the upper surface of the special cord and steel wire with glue, then cut it according to the specifications and dimensions, and then apply the glue after cutting. Put the glued steel wire and canvas on the part of the tire mouth to make it whole. Install the pneumatic tire or water tire into the mold for vulcanization. The vulcanization process makes the cross-section of the tire approximately a semi-circular ring body.
  • the inner tube production process is: putting the compound into the extruder
  • the extrusion temperature is 70 ° C.
  • the rubber material is squeezed out of the rubber round pipe, and then the rubber round pipe is cut off.
  • the joint forms a ring rubber round pipe.
  • the ring-shaped rubber round pipe is vulcanized into the mold.
  • the vulcanization temperature is controlled at 150 ° C.
  • the pressure is controlled at 8 kg / cm2, and the inner tube is produced after the vulcanization is completed.
  • -A complete set of pneumatic tires can be produced by two different production processes of inner tube and outer tube, and cannot be formed at one time.
  • the object of the present invention is to provide a production process capable of producing a non-inflatable hollow tire and a special mold core for producing a non-inflatable hollow tire using only one production process.
  • the technical solution used to solve its technical problems is to send the compound to the extruder, and the temperature of the extruder is controlled at 90-11CTC. Under the working pressure of the extruder, extrude the porous rubber band. Then the porous rubber band is sent to the cutting machine, which is cut off according to the specifications and size requirements. The two ends of the porous rubber band are sent to the gas protection chamber of the joint machine. The protective gas is passed into the gas protection chamber, and then the porous rubber is The joint is used to carry out the joint, and the annular rubber band after the joint is sent to the setting machine, and the pressure of the setting machine is controlled to be not less than 4 to 5 kg / cm2 at normal temperature. After the setting is completed, the mold is vulcanized.
  • the temperature is controlled at 137'C during vulcanization. — 145 ° C, the air pressure in the tire cavity is controlled at 12-26 kg / cm2, and the holding time is 8 minutes to 60 minutes. At the same time, vulcanization completes the process of extruding a variety of tire tread patterns in the crown part. Inflatable hollow tire.
  • the special mold core has a mold chassis, a core seat at the center of the mold chassis, and one end of the core seat is a cone; one end is connected with a core head, and the core seat passes The connecting rod is connected with the mold chassis.
  • the mandrel head is a double or multi-core post.
  • the non-pneumatic tire produced by this process is composed of a tire crown, a toe, and an elastic support frame and a ligament in the tire, and a buffer cavity composed of the support frame and the ligament forms a complete non-inflatable hollow tire.
  • the toe is connected to the wheel.
  • the tire When the crown is stressed, the tire is deformed toward the longitudinal axis of the toe to extend the transverse axis.
  • the elastic support frame plays the main supporting role, the ligament plays a pulling role, and the buffer cavity plays an elastic bracket.
  • the ligament deforms the cushion allows the tire to return to its original shape under the action of the ligament. After the tire ’s external force is removed, the tire is not inflated from the beginning to the end. .
  • FIG. 1 is a structural diagram of a double core post of a special mold core of the present invention.
  • FIG. 2 is a structural diagram of a multi-core post of a special mold core according to the present invention.
  • Example 1 Feed the compounded rubber compound into an extruder.
  • the temperature of the extruder is controlled at 100 ° C.
  • a double-hole rubber band is extruded, and then the double-hole rubber band is extruded.
  • Feed into the cutting machine cut off according to the specifications and size requirements, send the two ends of the porous rubber band into the gas protection chamber of the joint machine, pass the protective gas into the gas protection chamber, and then connect the porous rubber band to the joint.
  • the endless rubber belt is fed into the setting machine, and the pressure of the setting machine is controlled to be not less than 4 kg / cm2 at room temperature. After the setting is completed, the mold is vulcanized.
  • the temperature is controlled at 140 ° C and the pressure is controlled at 25 kg I square. Cm, holding time is 20 minutes, after the vulcanization is completed, a variety of tire patterns are pressed on the outside of the tire, and the mold becomes a non-pneumatic tire.
  • This special mold core has a stack of JS discs 2 at the center position of the mold chassis 2, a core seat 4 at one end of which is a cone;-the end is connected with the core head 1-12, and the core seat 4 is connected by The rod 3 is connected to the mold chassis 2.
  • the mandrel heads 1 to 2 are double mandrels.
  • Example 2 The temperature of the extruder was controlled at 90 ° C; the temperature was controlled at 137 ° C during vulcanization, the pressure was controlled at 12 kg / cm2, and the holding time was 8 minutes.
  • the mandrel heads 1-1 are multi-core posts.
  • the other parts are the same as those of the first embodiment, and are omitted.
  • Example 3 The temperature of the extruder is controlled at 110 ° C. Under the working pressure of the extruder, the porous rubber band is extruded, and the porous rubber band is sent to the cutting machine, which is cut according to the specifications and size requirements. Laminate multiple porous rubber strips in parallel to form a complete rubber band with more than three holes. Control the temperature at 145 ° C during vulcanization, control the pressure at 20 kg / cm2, and hold time for 60 minutes. Example 1 is the same, omitted. '

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Tyre Moulding (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

The invention relates to a process for producing a tyre, particularly to a non-pneumatic hollow tyre and a specific extrusion mandrel for an extruding die. A rubber mixture is supplied to an extruder and extruded to form a multi-hollow rubber strip by the extruder with the temperature being controlled in a range of 90-110°C. The obtained rubber strip is cut to form a rubber strip having two ends. Then the two ends of the strip are placed in an end joint apparatus and jointed together to form an annular multi-hollow rubber strip. The obtained annular rubber strip is put into a vulcanization- shaping apparatus and vulcanized, the pressure of the said apparatus is controlled not less than 4-5kgf/A?2 in the environmental temperature, the vulcanization temperature is controlled in a range of 137-145°C, the pressure inside of the tyre is controlled in a range of 12-26kgf/Am2 and maintained 8-60 minutes, and then the non-­pneumatic hollow tyre is obtained. The process of the invention can avoid multi-step repeated steps compared with the process of producing an external tyre or an inner tube of the pneumatic tyre. The non-­pneumatic hollow tyre can be produced in one-step in accordance with the said process, therefore the production efficiency will be increased, the energy sources will be saved, and the intensity of labor will be reduced.

Description

免充气空心轮胎生产工艺及专用模芯 技术领域  Production process of non-inflatable hollow tire and special mold core
本发明涉及一种轮胎生产工艺， 特别是一种免充气空心轮胎生产工艺及专用模芯。  The invention relates to a tire production process, in particular to a non-inflatable hollow tire production process and a special mold core.
背景技术  Background technique
目前， 人们使用的车轮轮胎均由内胎和外胎组成， 外胎的作用是耐磨和承压， 内胎的 作用是储气， 因此内胎为了使充入的气体不泄露采用橡胶制成， 在内胎上连接充气嘴； 外 胎为了耐磨和承压采用帘子布和橡胶制作。其外胎的生产工艺为： 先将专用帘布、钢丝上 表面擦上胶， 然后按规格、尺寸要求裁断， 裁断后再贴合， 在胎子口部分贴上擦胶后的钢 丝和帆布，将其整体装上风胎或水胎入模进行硫化，硫化过程使外胎横截面近似为半圆形 的环形体， 硫化结束后， 出模即成为外胎； 内胎生产工艺为： 将混炼胶料进入挤出机， 挤 出温度为 70°C， 将胶料挤出橡胶圆管， 再将橡胶圆管切断， 接头形成环形橡胶圆管， 将 环.形橡胶圆管入模硫化， 硫化温度控制在 150°C， 压力控制在 8公斤 /平方厘米， 硫化完 成后出模即生产出内胎。- 套完整的充气轮胎需要由内胎和外胎二种不同的生产工艺才能 生产出来， 不能一次成型。  At present, the wheels and tires used by people are composed of inner tubes and outer tubes. The role of the outer tube is abrasion resistance and pressure bearing. The inner tube functions as gas storage. Therefore, the inner tube is made of rubber in order to prevent leakage of the filled gas. Inflatable mouth; tires are made of cord and rubber for wear resistance and pressure. The production process of the tire is as follows: firstly wipe the upper surface of the special cord and steel wire with glue, then cut it according to the specifications and dimensions, and then apply the glue after cutting. Put the glued steel wire and canvas on the part of the tire mouth to make it whole. Install the pneumatic tire or water tire into the mold for vulcanization. The vulcanization process makes the cross-section of the tire approximately a semi-circular ring body. After vulcanization, the tire is ejected to become the tire. The inner tube production process is: putting the compound into the extruder The extrusion temperature is 70 ° C. The rubber material is squeezed out of the rubber round pipe, and then the rubber round pipe is cut off. The joint forms a ring rubber round pipe. The ring-shaped rubber round pipe is vulcanized into the mold. The vulcanization temperature is controlled at 150 ° C. The pressure is controlled at 8 kg / cm2, and the inner tube is produced after the vulcanization is completed. -A complete set of pneumatic tires can be produced by two different production processes of inner tube and outer tube, and cannot be formed at one time.
发明内容  Summary of the invention
本发明的目的是要提供一种:只用一种生产工艺就能生产出免充气空心轮胎的生产工 艺以及生产免充气空心轮胎的专用模芯。  The object of the present invention is to provide a production process capable of producing a non-inflatable hollow tire and a special mold core for producing a non-inflatable hollow tire using only one production process.
解决其技术问题釆用的工艺技术方案是：将混炼胶料送入挤出机，挤出机的温度控制 在 90— 11CTC , 在挤出机的工作压力下， 挤出多孔的橡胶带， 再将多孔的橡胶带送入切断 机， 按规格、 尺寸要求截断， 将多孔的橡胶带二个端头送入接头机的气体保护室内， 在气 体保护室内通入保护气体，然后对多孔的橡胶带进行接头，将接头后的环形橡胶带送入定 型机， 在常温下控制定型机的压力不小于 4一 5公斤 /平方厘米， 定型完成后入模进行硫 化， 硫化时控制温度在 137'C— 145°C , 胎内腔空气压力控制在 12— 26公斤 /平方厘米， 保持时间 8分钟一 60分钟， 硫化的同时完成了在胎冠部分压出多种外胎花紋的过程， 出 模即成为免充气空心轮胎。  The technical solution used to solve its technical problems is to send the compound to the extruder, and the temperature of the extruder is controlled at 90-11CTC. Under the working pressure of the extruder, extrude the porous rubber band. Then the porous rubber band is sent to the cutting machine, which is cut off according to the specifications and size requirements. The two ends of the porous rubber band are sent to the gas protection chamber of the joint machine. The protective gas is passed into the gas protection chamber, and then the porous rubber is The joint is used to carry out the joint, and the annular rubber band after the joint is sent to the setting machine, and the pressure of the setting machine is controlled to be not less than 4 to 5 kg / cm2 at normal temperature. After the setting is completed, the mold is vulcanized. The temperature is controlled at 137'C during vulcanization. — 145 ° C, the air pressure in the tire cavity is controlled at 12-26 kg / cm2, and the holding time is 8 minutes to 60 minutes. At the same time, vulcanization completes the process of extruding a variety of tire tread patterns in the crown part. Inflatable hollow tire.
解决其技术问题的专用模芯的方案是：该专用模芯有一模底盘，在模底盘的中心位置 有一模芯座，模芯座一端为圆锥体；一端连接有模芯头，模芯座通过连接杆与模底盘连接。  The solution of the special mold core for solving its technical problems is that the special mold core has a mold chassis, a core seat at the center of the mold chassis, and one end of the core seat is a cone; one end is connected with a core head, and the core seat passes The connecting rod is connected with the mold chassis.
模芯头为双芯柱或者多芯柱。  The mandrel head is a double or multi-core post.
有益效果： 上述方案中， 通过将混炼胶料进行挤出、 截断、 接头、 定型、 入模硫化等 工序一次成形，便成为了内外胎合一的胎体内部形成多条环形腔的免充气空心轮胎，此轮 胎不用充气便具备充气轮胎的性能，达到了本发明的目的。该生产工艺相对充气轮胎的内 胎和外胎的生产工艺节省多步重复工艺，通过该生产工艺一次即可生产出免充气轮胎， 因 此大大提高了生产效率， 节省了能 ii， 降低了工人的劳动强度。该工艺生产出的免充气轮 胎是由胎冠、胎趾和轮胎内的弹性支承架、韧带构成， 以及由支承架和韧带构成的缓冲腔 组成完整的免充气空心轮胎， 胎冠与地面接触， 胎趾与车轮连接， 当胎冠受力后轮胎向胎 趾方向纵向轴线变形， 使横向轴线伸长， 变形时弹性支承架起主要支承作用， 韧带起到牵 拉作用， 缓冲腔起到弹性支架与韧带变形时的缓冲容让作用， 当胎冠外力撤消后， 在韧带 的作用下轮胎又恢复原形，该轮胎自投入使用后， 自始至终不用充气，不怕尖锐物体扎破， 为无内胎免充气轮胎。 Beneficial effect: In the above solution, by extruding, cutting, jointing, shaping, and vulcanization of the compounded rubber at one time, it becomes a non-inflatable that forms a plurality of annular cavities inside the carcass with the inner and outer tires integrated A hollow tire, which has the performance of a pneumatic tire without being inflated, and achieves the object of the present invention. Compared with the production process of the inner tube and the outer tube of the pneumatic tire, the production process saves multiple steps of repeated processes, and through the production process, a non-pneumatic tire can be produced, because This greatly improves production efficiency, saves energy ii, and reduces the labor intensity of workers. The non-pneumatic tire produced by this process is composed of a tire crown, a toe, and an elastic support frame and a ligament in the tire, and a buffer cavity composed of the support frame and the ligament forms a complete non-inflatable hollow tire. The toe is connected to the wheel. When the crown is stressed, the tire is deformed toward the longitudinal axis of the toe to extend the transverse axis. When deformed, the elastic support frame plays the main supporting role, the ligament plays a pulling role, and the buffer cavity plays an elastic bracket. When the ligament deforms, the cushion allows the tire to return to its original shape under the action of the ligament. After the tire ’s external force is removed, the tire is not inflated from the beginning to the end. .
附图说明  BRIEF DESCRIPTION OF THE DRAWINGS
图 1为本发明专用模芯的双芯柱,的结构图。  FIG. 1 is a structural diagram of a double core post of a special mold core of the present invention.
图 2为本发明专用模芯的多芯柱的结构图。  FIG. 2 is a structural diagram of a multi-core post of a special mold core according to the present invention.
具体实施方式  detailed description
实施例 1 : 将混炼胶料送入挤出机， 挤出机的温度控制在 100°C , 在挤出机的工作压 力下， 挤出双孔的橡胶带， 再将双孔的橡胶带送入切断机， 按规格、 尺寸要求截断， 将多 孔的橡胶带二个端头送入接头机的气体保护室内，在气体保护室内通入保护气体，然后对 多孔的橡胶带进行接头，将接头后的环形橡胶带送入定型机，在常温下控制定型机的压力 不小于 4公斤 /平方厘米， 定型完成后入模进行硫化， 硫化时控制温度在 140°C， 压力控 制在 25公斤 I平方厘米，保持时间 20分钟，硫化完成后在轮胎的外侧压出多种外胎花纹， 出模即成为免充气轮胎。  Example 1: Feed the compounded rubber compound into an extruder. The temperature of the extruder is controlled at 100 ° C. Under the working pressure of the extruder, a double-hole rubber band is extruded, and then the double-hole rubber band is extruded. Feed into the cutting machine, cut off according to the specifications and size requirements, send the two ends of the porous rubber band into the gas protection chamber of the joint machine, pass the protective gas into the gas protection chamber, and then connect the porous rubber band to the joint. The endless rubber belt is fed into the setting machine, and the pressure of the setting machine is controlled to be not less than 4 kg / cm2 at room temperature. After the setting is completed, the mold is vulcanized. The temperature is controlled at 140 ° C and the pressure is controlled at 25 kg I square. Cm, holding time is 20 minutes, after the vulcanization is completed, a variety of tire patterns are pressed on the outside of the tire, and the mold becomes a non-pneumatic tire.
该专用模芯有一椁 JS盘 2 , 在模底盘 2的中心位置有一模芯座 4, 模芯座 4一端为圆 锥体； --端连接有模芯头 1一 2 , 模芯座 4通过连接杆 3与模底盘 2连接。  This special mold core has a stack of JS discs 2 at the center position of the mold chassis 2, a core seat 4 at one end of which is a cone;-the end is connected with the core head 1-12, and the core seat 4 is connected by The rod 3 is connected to the mold chassis 2.
图 1中， 模芯头 1一 2为双芯柱。  In FIG. 1, the mandrel heads 1 to 2 are double mandrels.
实施例 2: 挤出机的温度控制在 90°C ; 硫化时控制温度在 137°C， 压力控制在 12公 斤 /平方厘米， 保持时间 8分钟。  Example 2: The temperature of the extruder was controlled at 90 ° C; the temperature was controlled at 137 ° C during vulcanization, the pressure was controlled at 12 kg / cm2, and the holding time was 8 minutes.
图 2中， 模芯头 1一 1为多芯柱。 其它与实施例 1同， 略。  In Fig. 2, the mandrel heads 1-1 are multi-core posts. The other parts are the same as those of the first embodiment, and are omitted.
'实施例 3 : 挤出机的温度控制在 110°C， 在挤出机的工作压力下， 挤出多孔的橡胶带， 再将多孔的橡胶带送入切断机， 按规格、 尺寸要求截断， 将多条多孔的橡胶带平行贴合， 使其形成一个完整的三孔以上的橡胶带， 硫化时控制温度在 145 °C， 压力控制在 20公斤 /平方厘米， 保持时间 60分钟， 其它与实施例 1同， 略。 '  'Example 3: The temperature of the extruder is controlled at 110 ° C. Under the working pressure of the extruder, the porous rubber band is extruded, and the porous rubber band is sent to the cutting machine, which is cut according to the specifications and size requirements. Laminate multiple porous rubber strips in parallel to form a complete rubber band with more than three holes. Control the temperature at 145 ° C during vulcanization, control the pressure at 20 kg / cm2, and hold time for 60 minutes. Example 1 is the same, omitted. '

Claims

权 利 要 求 Rights request
1、 一种免充气轮胎的生产工艺， 其特征是： 将混炼胶料送入挤出机， 挤出机的温度 控制在 90—iicrc， 在挤出机的工作压力下， 挤出多孔的橡胶带， 再将多孔的橡胶带送入 切断机， ¾规格、 尺寸要求截断， 将多孔的橡胶带二个端头送入接头机的气体保护室内， 在气体保护室内通入保护气体，然后对多孔的橡胶带进行接头，将接头后的环形橡胶带送 入定型机， 在常温下控制定型机的压力不小于 4一 5公斤 /平方厘米， 定型完成后入模进 行硫化， 硫化时控制温度在 137Ό— 145Ό , 胎内腔空气压力控制在 12— 26公斤 /平方厘 米， 保持时间 8分钟一 60分钟， 硫化的同时完成了在胎冠部分压出多种外胎花纹的过程， 出模即成为免充气空心轮胎。 ， 1. A production process for non-pneumatic tires, which is characterized in that: the compound is sent to an extruder, and the temperature of the extruder is controlled at 90-icrc, under the working pressure of the extruder, the porous Rubber belt, then feed the porous rubber belt to the cutting machine, cut off the specifications and sizes, send the two ends of the porous rubber belt to the gas protection chamber of the joint machine, pass the protective gas into the gas protection chamber, and then The porous rubber belt is jointed, and the annular rubber belt after the joint is sent to the setting machine, and the pressure of the setting machine is controlled to be not less than 4 to 5 kg / cm2 at normal temperature. After the setting is completed, the mold is vulcanized. The temperature is controlled during vulcanization. 137Ό—145Ό, the air pressure in the tire cavity is controlled at 12-26 kg / cm2, and the holding time is 8 minutes to 60 minutes. At the same time, the vulcanization process of extruding a variety of tire patterns in the crown part is completed. Hollow tires. ,
2、一种生产免充气轮胎挤出工艺宁的专用模芯， 其特征是： 该专用模芯有一模底盘， 在模底盘的中心位置有一模芯座， 模芯座一端为圆锥体； 一端连接有模芯头， 模芯座通过 连接杆与模底盘连接。  2. A special mold core for the production of non-pneumatic tire extrusion process, which is characterized in that: the special mold core has a mold chassis, a core seat at the center of the mold chassis, and one end of the core seat is a cone; one end is connected There is a core head, and the core seat is connected to the mold chassis through a connecting rod.
3、 根据权利要求 2所述的免充气轮胎的专用模芯， .其特征是： 模芯头为双芯柱或者 多芯柱  3. A special mold core for a non-pneumatic tire according to claim 2, characterized in that: the core head is a double-core post or a multi-core post
PCT/CN2004/001448 2004-06-02 2004-12-14 A process for producing a non-pneumatic hollow tyre and a specific extrusion mandrel therefor WO2005118269A1 (en)

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JP2007600020U JP3141035U (en) 2004-06-02 2004-12-14 Hollow tire manufacturing process and mold core that do not require air

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CN108248305A (en) * 2017-12-26 2018-07-06 江苏江昕轮胎有限公司 A kind of fast quick-mounting tire machine

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CN1583400A (en) * 2004-06-02 2005-02-23 王明江 Manufacturing process for non-aerating hollow tyre and special mould core
CN100553936C (en) * 2005-04-26 2009-10-28 王明江 Aeration free multi hole hollow type extrusion mould
CN109049607B (en) * 2018-09-19 2020-04-28 江苏江昕轮胎有限公司 Non-inflatable hollow tyre shaping mould
CN109501190A (en) * 2018-11-21 2019-03-22 软控股份有限公司 Tire production system and tyre production technology
CN111086251A (en) * 2019-12-16 2020-05-01 河北莫申科技有限公司 Integral vulcanization production process for inflatable sealing ring

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CN1583400A (en) 2005-02-23
CN100420562C (en) 2008-09-24
CN1693046A (en) 2005-11-09
JP3141035U (en) 2008-04-24

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