JP2012200949A - Tire forming method - Google Patents

Tire forming method Download PDF

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JP2012200949A
JP2012200949A JP2011066412A JP2011066412A JP2012200949A JP 2012200949 A JP2012200949 A JP 2012200949A JP 2011066412 A JP2011066412 A JP 2011066412A JP 2011066412 A JP2011066412 A JP 2011066412A JP 2012200949 A JP2012200949 A JP 2012200949A
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Prior art keywords
rubber
kneading
extruder
continuously
tire
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JP5651513B2 (en
Inventor
Taichi Nagae
太一 永江
Hiroshi Ikegami
博 池上
Yasuhiro Kanai
泰寛 金井
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Priority to JP2011066412A priority Critical patent/JP5651513B2/en
Priority to PCT/JP2012/055971 priority patent/WO2012128056A1/en
Publication of JP2012200949A publication Critical patent/JP2012200949A/en
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    • 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
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/30—Applying the layers; Guiding or stretching the layers during application
    • B29D30/3028—Applying the layers; Guiding or stretching the layers during application by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the drum axis, to form an annular element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/362—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using static mixing devices
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/387—Plasticisers, homogenisers or feeders comprising two or more stages using a screw extruder and a gear pump
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/695—Flow dividers, e.g. breaker plates
    • B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92209—Temperature
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92219—Degree of crosslinking, solidification, crystallinity or homogeneity
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/355—Conveyors for extruded articles
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/68—Barrels or cylinders
    • B29C48/685—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads
    • B29C48/687—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads having projections with a short length in the barrel direction, e.g. pins
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/69—Filters or screens for the moulding material
    • B29C48/693—Substantially flat filters mounted at the end of an extruder screw perpendicular to the feed axis

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Tyre Moulding (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a tire forming method by which intermediate stock occurring between the final rubber kneading and profile molding is eliminated and a cycle time is remarkably reduced.SOLUTION: The tire forming method has a step of kneading an unvulcanizable rubber and a step of continuously kneading the unvulcanizable rubber by an extruder 1. The step by the extruder 1 has a step of supplying vulcanizing chemical and continuously kneading the vulcanizable rubber, a step of curing the vulcanizable rubber and a step of continuously extrusion molding the cured rubber as a tire member having a predetermined cross-sectional shape.

Description

本発明は、非加硫性ゴムを混練する工程と、この非加硫性ゴムを押出機により連続混錬する工程と、を有するタイヤ成形方法に関するものである。   The present invention relates to a tire molding method including a step of kneading a non-vulcanizable rubber and a step of continuously kneading the non-vulcanizable rubber with an extruder.

自動車のタイヤの構成部材のようなゴム製品の製造方法は、まず、バンバリーミキサー等の混練機を用いて、原料ゴムに補強剤、充填剤、可塑剤等の添加剤（但し、加硫剤や加硫促進剤を除く）を配合・混練（ノンプロゴム混練）してシート状の非加硫性ゴムを製造する。次に、この非加硫性のゴムシートをバンバリーミキサーや混練機に再供給し、加硫剤及び加硫促進剤を添加・混練（ファイナルゴム混練）し、シート状の加硫性ゴムを得る。そして、この加硫性ゴムシートを押出機に供給し、所望の断面形状にして押し出し成形（プロファイル成形）し、所望の形状のゴム製品を製造する。   A rubber product such as a component of an automobile tire is first manufactured by using a kneader such as a Banbury mixer to add additives such as a reinforcing agent, a filler, and a plasticizer to the raw rubber (however, a vulcanizing agent, A sheet-like non-vulcanizable rubber is produced by blending and kneading (excluding vulcanization accelerators) (non-pro rubber kneading). Next, this non-vulcanizable rubber sheet is supplied again to a Banbury mixer or kneader, and a vulcanizing agent and a vulcanization accelerator are added and kneaded (final rubber kneading) to obtain a sheet-like vulcanizable rubber. . Then, this vulcanizable rubber sheet is supplied to an extruder, extruded into a desired cross-sectional shape (profile molding), and a rubber product having a desired shape is manufactured.

上記において、ファイナルゴム混練を行った後、直ちにプロファイル成形を行うのではなく、数時間から１日かけて熟成が行われる。これは、加硫系薬品を均一に分散させてファイナルゴムの特性を安定させるためと、必要以上の熱履歴によるゴム焼けの問題を防止するためである。また、加硫性ゴムの疲労回復と可塑度の均一化を図るためである。   In the above, after final rubber kneading, aging is carried out over several hours to one day instead of immediately performing profile molding. This is for uniformly dispersing the vulcanized chemicals to stabilize the properties of the final rubber and for preventing the problem of rubber burning due to excessive heat history. In addition, this is to recover the fatigue of the vulcanizable rubber and make the plasticity uniform.

しかし、上記熟成期間をわざわざ設けることで、ファイナルゴム混練とプロファイル成形の間に中間在庫が発生し、保管場所の確保等の問題があった。   However, by providing the aging period, intermediate stock is generated between final rubber kneading and profile molding, and there is a problem of securing a storage location.

例えば、下記特許文献１では、押し出し成形機等のゴム混練装置を用いて、ベースゴムを連続的に投入し、続いてファイナル薬品を連続的に加えて、ゴム混練装置内で連続的に混合する方法を開示している。この方法によれば、ベースゴムを連続的に投入するので、ファイナルゴム混練を行うまでの中間在庫はなくすことができる。   For example, in Patent Document 1 below, a base rubber is continuously added using a rubber kneading apparatus such as an extrusion molding machine, then final chemicals are continuously added, and are continuously mixed in the rubber kneading apparatus. A method is disclosed. According to this method, since the base rubber is continuously charged, it is possible to eliminate intermediate stock until the final rubber is kneaded.

特開２０１０−１８０２６４号公報（特許請求の範囲、段落０００２〜０００３）JP 2010-180264 A (claims, paragraphs 0002 to 0003)

しかしながら、ファイナルゴム混練後、プロファイル成形を行うまでの間に発生する中間在庫の問題は解決されていない。   However, the problem of intermediate stock that occurs between the final rubber kneading and the profile molding has not been solved.

本発明は上記実情に鑑みてなされたものであり、その課題は、ファイナルゴム混練とプロファイル成形の間に発生する中間在庫をなくしサイクルタイムの大幅削減を実現可能なタイヤ成形方法を提供することである。   The present invention has been made in view of the above circumstances, and its object is to provide a tire molding method that can eliminate intermediate stock generated between final rubber kneading and profile molding and can realize a significant reduction in cycle time. is there.

上記課題を解決するため本発明に係るタイヤ成形方法は、
非加硫性ゴムを混練する工程と、
この非加硫性ゴムを押出機により連続混錬する工程と、を有するタイヤ成形方法であって、
前記押出機による工程は、
加硫系薬品を供給し、加硫性ゴムを連続混練する工程と、
前記加硫性ゴムを熟成する工程と、
熟成された加硫性ゴムを所定の断面形状のタイヤ部材として連続押し出し成形する工程と、を有することを特徴とするものである。 In order to solve the above problems, a tire molding method according to the present invention is as follows.
A step of kneading non-vulcanizable rubber;
A step of continuously kneading the non-vulcanizable rubber with an extruder, and a tire molding method comprising:
The process by the extruder
Supplying vulcanized chemicals and continuously kneading vulcanizable rubber;
Aging the vulcanizable rubber;
And a step of continuously extruding the aged vulcanizable rubber as a tire member having a predetermined cross-sectional shape.

この構成によるタイヤ成形方法の作用・効果を説明する。まず、非加硫性ゴムを混練する工程を有し、これは、例えば、バンバリーミキサーにより混練されシート状の非加硫性ゴム（ノンプロゴム）を作製する。次に、この非加硫性ゴムを押出機に投入して混練する。この押出機で、加硫系薬品を供給し加硫性ゴムを連続混練しつつ、押出機の内部にて、熟成させ、さらに、所定の断面形状を有するゴムを押し出し成形（プロファイル成形）する。すなわち、一旦、熟成させるという工程をなくし、プロファイル成形を行うので、上記押出機によりタイヤ構成部材の成形まで行うことができる。熟成させるために必要な条件（後述）を設定することで、押出機によりファイナル混練とプロファイル成形を連続的に行うことができることを本発明者は見出した。これにより、ファイナルゴム混練とプロファイル成形の間に発生する中間在庫をなくしサイクルタイムの大幅削減を実現可能なタイヤ成形方法を提供することができる。   The operation and effect of the tire molding method with this configuration will be described. First, there is a step of kneading non-vulcanizable rubber, which is, for example, kneaded by a Banbury mixer to produce a sheet-like non-vulcanizable rubber (non-pro rubber). Next, this non-vulcanizable rubber is put into an extruder and kneaded. In this extruder, vulcanizing chemicals are supplied and the vulcanizable rubber is continuously kneaded, while aging is performed inside the extruder, and rubber having a predetermined cross-sectional shape is extruded (profile molding). That is, since the step of aging is eliminated and profile molding is performed, the molding of the tire constituent member can be performed by the extruder. The present inventors have found that final kneading and profile forming can be continuously performed by an extruder by setting conditions (described later) necessary for aging. As a result, it is possible to provide a tire molding method capable of eliminating the intermediate stock generated between the final rubber kneading and the profile molding and realizing a significant reduction in cycle time.

本発明において、前記押し出し成形されるゴムの温度が８０℃以下に設定されていること画好ましい。   In the present invention, the temperature of the rubber to be extruded is preferably set to 80 ° C. or less.

かかる温度に設定することで、熟成期間を単独に設定しなくても、所望の物性が得られることを見出した。これにより、サイクルタイムの大幅削減を実現することができる。   It has been found that by setting to such a temperature, desired physical properties can be obtained without setting the aging period independently. Thereby, a significant reduction in cycle time can be realized.

第１実施形態に係るタイヤ成形方法を行うための設備を示す図The figure which shows the installation for performing the tire shaping | molding method which concerns on 1st Embodiment. ギアポンプ周辺の構成を示す拡大図Enlarged view showing the configuration around the gear pump 第１実施形態の成形手順を示すフローチャートThe flowchart which shows the shaping | molding procedure of 1st Embodiment. ギアポンプ回転数、スクリュー回転数、ギアポンプ入口圧力の関係を示す表Table showing the relationship between gear pump speed, screw speed, and gear pump inlet pressure 滞留空間の効果を示す図Diagram showing the effect of staying space バレルとスクリューの羽根の間の空間でゴムが混練される様子を示す図The figure which shows a mode that rubber | gum is kneaded in the space between a barrel and the blade | wing of a screw. 第２実施形態に係るタイヤ成形方法を行うための設備を示す図The figure which shows the installation for performing the tire shaping | molding method which concerns on 2nd Embodiment. 従来技術における成形手順を示すフローチャートFlow chart showing molding procedure in the prior art

本発明に係るタイヤ成形方法の好適な実施形態を図面を用いて説明する。図１は、第１実施形態に係るタイヤ成形方法を行うための設備を示す図である。   A preferred embodiment of a tire forming method according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing equipment for performing the tire molding method according to the first embodiment.

＜第１実施形態＞
図１において、押出機１は、スクリュー１０を有し駆動装置１１により駆動される。スクリュー１０が収容されるバレル１２には、ホッパー１３が設けられており、薬品供給機１４から加硫系薬品とノンプロゴムが投入される。ここで、ノンプロゴムとは、非加硫性ゴムのことであり、ノンプロゴム自体は、例えば、バンバリーミキサーにより混練される。得られたノンプロゴムは所定断面形状のシート状に形成される。 <First Embodiment>
In FIG. 1, the extruder 1 has a screw 10 and is driven by a drive device 11. A hopper 13 is provided in the barrel 12 in which the screw 10 is accommodated, and vulcanized chemicals and non-pro rubber are supplied from a chemical feeder 14. Here, the non-pro rubber is a non-vulcanizable rubber, and the non-pro rubber itself is kneaded by, for example, a Banbury mixer. The obtained non-pro rubber is formed into a sheet having a predetermined cross-sectional shape.

バレル１２の内壁面にはピン１７が多数植設されている。ピン１７は、スクリュー１０の羽根と羽根の間に位置しており、ゴムを混練するときの圧力を高めることができる。ピン１７の配置場所や個数については、選択的に行うことができる。ピン１７の形状は円柱状であるが、形状や大きさについては、適宜決めることができる。   A large number of pins 17 are planted on the inner wall surface of the barrel 12. The pin 17 is located between the blades of the screw 10 and can increase the pressure when kneading rubber. The location and number of pins 17 can be selectively performed. The shape of the pin 17 is cylindrical, but the shape and size can be determined as appropriate.

図２は、ギアポンプ１５の周辺の構成を示す詳細な断面図である。ギアポンプ１５は、一対のギヤ１５ａ，１５ｂを備えており、図２の矢印方向に回転し、下流側へゴムの定量供給を行うことができる。ギヤ１５ａ，１５ｂの回転数を制御することで、ギアポンプ１５から排出されるゴムの量を制御することができる。   FIG. 2 is a detailed cross-sectional view showing the configuration around the gear pump 15. The gear pump 15 includes a pair of gears 15a and 15b, and rotates in the direction of the arrow in FIG. 2 so that a constant amount of rubber can be supplied downstream. The amount of rubber discharged from the gear pump 15 can be controlled by controlling the rotation speed of the gears 15a and 15b.

ギアポンプ１５と金型１６の間のゴム流路に濾過機構１８が設けられている。この濾過機構１８は、上流側に配置されるメッシュ１８０と、下流側に配置されるブレーカープレート１８１により構成される。メッシュ１８０は、ブレーカープレート１８１に形成された凹部１８１ａにはめ込まれている。メッシュ１８０は金属製であり、微細な網の目が多数形成されている。ブレーカープレート１８１には、多数の貫通孔１８１ｂが形成されており、濾過されたゴムが通過する。   A filtration mechanism 18 is provided in a rubber flow path between the gear pump 15 and the mold 16. The filtration mechanism 18 includes a mesh 180 disposed on the upstream side and a breaker plate 181 disposed on the downstream side. The mesh 180 is fitted in a recess 181 a formed in the breaker plate 181. The mesh 180 is made of metal, and a large number of fine meshes are formed. The breaker plate 181 has a large number of through holes 181b through which filtered rubber passes.

加硫系薬品とは、加硫剤や加硫促進剤のことを指し、ペレット状に形成された加硫系薬品がシート状のノンプロゴムと共に供給される。スクリュー１０の先端側にはギヤーポンプ１５と金型１６が設けられる。金型１６は、タイヤ構成部材に対応した所定断面形状を有しており、連続的に押し出し成形されたタイヤ構成部材は、コンベア２により引き取られる。   Vulcanizing chemicals refer to vulcanizing agents and vulcanization accelerators, and vulcanizing chemicals formed into pellets are supplied together with sheet-like non-pro rubber. A gear pump 15 and a mold 16 are provided on the distal end side of the screw 10. The mold 16 has a predetermined cross-sectional shape corresponding to the tire constituent member, and the tire constituent member continuously extruded is taken up by the conveyor 2.

図３は、成形手順を示すフローチャートである。ノンプロゴム混練は、従来と同じであるが、押出機による連続混練は従来と異なる。従来は、図８に示すように、ファイナル混練と熟成とプロファイル押出しは、別々の独立した工程であった。しかし、本発明においては、ファイナル混練からプロファイル押出しまで、押出機１において行われる。従って、熟成を行うための中間在庫は発生しない。   FIG. 3 is a flowchart showing the molding procedure. Non-pro rubber kneading is the same as the conventional one, but continuous kneading by an extruder is different from the conventional one. Conventionally, as shown in FIG. 8, final kneading, ripening, and profile extrusion were separate and independent processes. However, in this invention, it is performed in the extruder 1 from final kneading to profile extrusion. Therefore, there is no intermediate stock for aging.

＜熟成工程を押出機内部でできる理由＞
本発明に係る成形方法において、従来技術のように熟成工程を省略できるのは、押出機１の内部で熟成を行うことができるからである。そこで、熟成を行う理由の１つである「加硫性ゴム中の加硫系薬品（配合剤）の均一分散性の向上」が可能な理由は、次の通りである。 <Reason for aging process inside the extruder>
In the molding method according to the present invention, the aging step can be omitted as in the prior art because the aging can be performed inside the extruder 1. Therefore, the reason why “improving the uniform dispersibility of the vulcanizing chemical (compounding agent) in the vulcanizable rubber”, which is one of the reasons for aging, is as follows.

ギアポンプ１５の回転数と、スクリュー１０の回転数を調整し、ギアポンプ１５の入口（上流側）圧力をゴム混練に最適な条件にしている。図４に示す表において、条件（１）（２）（３）のように回転数を変えた場合の、ギアポンプ１５の入口圧力は、６ＭＰａ，１２ＭＰａ，１８ＭＰａのように変化する。ギアポンプ１５の入口側のゴムの分散や物性を測定したところ、条件（３）が最も混練に適していた。   The number of revolutions of the gear pump 15 and the number of revolutions of the screw 10 are adjusted, and the inlet (upstream side) pressure of the gear pump 15 is set to an optimum condition for rubber kneading. In the table shown in FIG. 4, the inlet pressure of the gear pump 15 when the rotational speed is changed as in the conditions (1), (2), and (3) changes as 6 MPa, 12 MPa, and 18 MPa. When the dispersion and physical properties of the rubber on the inlet side of the gear pump 15 were measured, the condition (3) was most suitable for kneading.

上記のことから、ギアポンプ１５の回転数と、スクリュー１０の回転数を検出する回転数検出センサーを夫々設け、また、ギアポンプ１５の入口側に圧力センサーを設けて、所望の圧力になるように、上記回転数を制御する制御部を設けておくことが好ましい。   From the above, a rotational speed detection sensor for detecting the rotational speed of the gear pump 15 and the rotational speed of the screw 10 is provided, and a pressure sensor is provided on the inlet side of the gear pump 15 so that a desired pressure is obtained. It is preferable to provide a control unit for controlling the rotational speed.

ちなみに、図２においてＳで示されるのは滞留空間である。ギアポンプ１５によるゴム排出量（回転数に依存）と、スクリュー１０によるゴムの供給量（回転数に依存）の差で、滞留空間Ｓにゴムの滞留が発生する。ここに圧力センサーを配置すれば、上記ギアポンプ１５の入口における圧力変動となって検出される。   Incidentally, what is indicated by S in FIG. 2 is a stay space. Rubber stays in the stay space S due to the difference between the amount of rubber discharged by the gear pump 15 (depending on the rotational speed) and the amount of rubber supplied by the screw 10 (dependent on the rotational speed). If a pressure sensor is arranged here, it is detected as a pressure fluctuation at the inlet of the gear pump 15.

また、熟成を行うもう１つの理由である「加硫性ゴムの疲労回復および可塑度の均一性の向上」が可能な理由は次の通りである。従来は、バンバリーミキサーで配合しており、すりつぶす等の過度の応力をその時々で局所的に与えていた。そのため、排出時に可塑度の不均一により、別途、熟成工程を設ける必要があった。しかし、本発明の場合は、押出機１によるプロファイル押し出し時に可塑度の均一化が可能になった。   Further, another reason why aging is possible, “recovery of fatigue of vulcanizable rubber and improvement in uniformity of plasticity” is as follows. Conventionally, it was blended with a Banbury mixer, and excessive stress such as grinding was locally given from time to time. Therefore, it was necessary to provide a separate aging step due to non-uniformity of plasticity during discharge. However, in the case of the present invention, the plasticity can be made uniform during profile extrusion by the extruder 1.

具体的には、ギアポンプ１５を設けていること、および、バレル１２の内壁面にピン１７を植設していることから、ギアポンプ１５の入口において、ゴムに均一な圧力をかけることができるためである。また、滞留空間Ｓを形成することで、ゴムの可塑度の時間的なばらつきを減少させることができるためである。   Specifically, since the gear pump 15 is provided and the pin 17 is implanted on the inner wall surface of the barrel 12, uniform pressure can be applied to the rubber at the inlet of the gear pump 15. is there. Moreover, it is because the dispersion | variation with time of the plasticity of rubber | gum can be reduced by forming the residence space S. FIG.

これを図５に示す。滞留空間Ｓがない場合は、（ａ）に示すように、時系列的に可塑度が異なるゴムが混練された場合、滞留しないので、前後のゴムの混ざりがなく（ゾーン（２）のゴムが前後のゾーン（１，３）のゴムと混ざることがなく）、可塑度は時間的にばらついたままである。一方、滞留空間Ｓがある場合は、（ｂ）に示すように、ゾーン（１，２，３）が混ざり合い、前後の可塑度の差がなくなる。すなわち、上記の現象が連続的に発生することで、時間的に可塑度の均一なゴムを押し出すことができる。さらに、濾過機構１８を設けていることで、上記の効果をより促進させることができる。   This is shown in FIG. When there is no stay space S, as shown in (a), when rubbers having different plasticity in time series are kneaded, there is no stay, so there is no mixing of the front and rear rubbers (the rubber in zone (2) Without mixing with the rubber in the front and rear zones (1, 3)), the plasticity remains variable over time. On the other hand, when there is the staying space S, as shown in (b), the zones (1, 2, 3) are mixed and there is no difference in the plasticity before and after. That is, when the above phenomenon occurs continuously, it is possible to extrude rubber having a uniform plasticity with time. Furthermore, by providing the filtration mechanism 18, the above effect can be further promoted.

金型１６から押し出されるタイヤ構成部材の温度は、８０℃以下の温度になるように制御される。これにより、熟成期間を置かなくても、要求される特性を有するタイヤ構成部材を得ることができる。従って、サイクルタイムの大幅削減が可能になる。   The temperature of the tire constituent member extruded from the mold 16 is controlled to be a temperature of 80 ° C. or lower. As a result, it is possible to obtain a tire constituent member having required characteristics without a aging period. Therefore, the cycle time can be greatly reduced.

具体的には、スクリュー１０、バレル１２、ギアポンプ１５等の温度の調整を行っているためである。図６は、バレル１２とスクリュー１０の羽根の間の空間でゴムが混練される様子を示す図である。   Specifically, the temperature of the screw 10, the barrel 12, the gear pump 15, etc. is adjusted. FIG. 6 is a diagram showing how rubber is kneaded in the space between the barrel 12 and the blades of the screw 10.

スクリュー１０側の温度と、バレル１２の温度とギアポンプ１５の温度に差（１０〜２０℃）をつけることで、冷却効果によりゴムがバレル１２の内壁面に引っかかり、ゴムによる剪断力が作用し、粘度低下を促進し、混練効果が向上すると考えられる。例えば、バレル１２を６０℃、スクリュー１０を８０℃、ギアポンプ１５を８０℃に設定する。   By making a difference (10 to 20 ° C.) between the temperature on the screw 10 side, the temperature of the barrel 12 and the temperature of the gear pump 15, the rubber is caught on the inner wall surface of the barrel 12 by the cooling effect, and the shearing force by the rubber acts. It is considered that the viscosity reduction is promoted and the kneading effect is improved. For example, the barrel 12 is set to 60 ° C., the screw 10 is set to 80 ° C., and the gear pump 15 is set to 80 ° C.

＜第２実施形態＞
図３は、第２実施形態に係るタイヤ成形方法を行うための設備を示す図である。第１実施形態と異なる点は、成形ドラムに直接ゴムを貼り付けていく設備である。具体的には、金型１６から、帯状のストリップゴムを押し出し成形し、直接成形ドラムに貼り付ける。 Second Embodiment
FIG. 3 is a diagram showing equipment for performing the tire forming method according to the second embodiment. The difference from the first embodiment is the facility for sticking rubber directly to the molding drum. Specifically, a strip-shaped strip rubber is extruded from the mold 16 and directly attached to a molding drum.

この場合も第１実施形態と同様に中間在庫は発生しない。   In this case as well, no intermediate inventory occurs as in the first embodiment.

１ 押出機
２ ベルトコンベア
３ 成形ドラム
１０ スクリュー
１２ バレル
１３ ホッパー
１４ 薬品供給機
１５ ギアポンプ
１６ 金型
１７ ピン
１８ 濾過機構
１８０ メッシュ
１８１ ブレーカープレート
Ｓ 滞留空間 DESCRIPTION OF SYMBOLS 1 Extruder 2 Belt conveyor 3 Molding drum 10 Screw 12 Barrel 13 Hopper 14 Chemical supply machine 15 Gear pump 16 Mold 17 Pin 18 Filtration mechanism 180 Mesh 181 Breaker plate S Residence space

Claims (2)

非加硫性ゴムを混練する工程と、
この非加硫性ゴムを押出機により連続混錬する工程と、を有するタイヤ成形方法であって、
前記押出機による工程は、
加硫系薬品を供給し、加硫性ゴムを連続混練する工程と、
前記加硫性ゴムを熟成する工程と、
熟成された加硫性ゴムを所定の断面形状のタイヤ部材として連続押し出し成形する工程と、を有することを特徴とするタイヤ成形方法。 A step of kneading non-vulcanizable rubber;
A step of continuously kneading the non-vulcanizable rubber with an extruder, and a tire molding method comprising:
The process by the extruder
Supplying vulcanized chemicals and continuously kneading vulcanizable rubber;
Aging the vulcanizable rubber;
And a step of continuously extruding the aged vulcanizable rubber as a tire member having a predetermined cross-sectional shape. 前記押し出し成形されるゴムの温度が８０℃以下に設定されていることを特徴とする請求項１に記載のタイヤ成形方法。 The tire molding method according to claim 1, wherein the temperature of the rubber to be extruded is set to 80 ° C or lower.
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WO2015030129A1 (en) * 2013-08-28 2015-03-05 株式会社日本触媒 Gel pulverization device, method for manufacturing polyacrylic acid (polyacrylate) superabsorbent polymer powder, and superabsorbent polymer powder
FR3134533A1 (en) * 2022-04-15 2023-10-20 Compagnie Generale Des Etablissements Michelin Process for decontaminating natural rubber by filtration of a moist coagulum of natural rubber.

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