JP5651513B2 - Method for forming tire constituent member - Google Patents
Method for forming tire constituent member Download PDFInfo
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- JP5651513B2 JP5651513B2 JP2011066412A JP2011066412A JP5651513B2 JP 5651513 B2 JP5651513 B2 JP 5651513B2 JP 2011066412 A JP2011066412 A JP 2011066412A JP 2011066412 A JP2011066412 A JP 2011066412A JP 5651513 B2 JP5651513 B2 JP 5651513B2
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- gear pump
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- 238000000034 method Methods 0.000 title claims description 28
- 239000000470 constituent Substances 0.000 title claims description 13
- 229920001971 elastomer Polymers 0.000 claims description 82
- 239000005060 rubber Substances 0.000 claims description 82
- 238000000465 moulding Methods 0.000 claims description 30
- 238000004898 kneading Methods 0.000 claims description 27
- 230000032683 aging Effects 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims 2
- 230000000694 effects Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 230000002431 foraging effect Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 240000006829 Ficus sundaica Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Images
Classifications
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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
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- 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
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Tyre Moulding (AREA)
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、を有するタイヤ構成部材の成形方法に関するものである。 The present invention relates to a method for molding a tire component having a step of kneading 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
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構成部材の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 method for molding a tire constituent member that can eliminate the intermediate inventory that occurs between final rubber kneading and profile molding and can realize a significant reduction in cycle time. It is to be.
上記課題を解決するため本発明に係るタイヤ構成部材の成形方法は、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、前記押出機の内部に6MPa以上の圧力でゴムを滞留させることにより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 method for molding a tire component according to the present invention includes a step of kneading a non-vulcanizable rubber and a step of continuously kneading the non-vulcanizable rubber with an extruder. In the method using the extruder, the vulcanizing chemical is supplied, the vulcanizable rubber is continuously kneaded , and the rubber is retained in the extruder at a pressure of 6 MPa or more. It has a step of aging a vulcanizable rubber and a step of continuously extruding the aging vulcanizable rubber as a tire member having a predetermined cross-sectional shape.
この構成によるタイヤ構成部材の成形方法の作用・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構成部材の成形方法を提供することができる。 The operation and effect of the method for molding a tire component member having 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 method for molding a tire constituent member that eliminates intermediate stock generated between final rubber kneading and profile molding and can realize 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.
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
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
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
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
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
図8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3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. 8 is a flowchart showing the molding procedure. Non-pro rubber kneading is the same as conventional, but continuous kneading by an extruder is different from the conventional one. Conventionally, as shown in FIG. 3 , final kneading, aging and profile extrusion were separate and independent processes. However, in this invention, it is performed in the
<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
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
(2) When the rotational speed is changed as in (3), the inlet pressure of the
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
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
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
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
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
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
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
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
<第2実施形態>
図7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. 7 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
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
Claims (6)
この非加硫性ゴムを押出機により連続混錬する工程と、を有するタイヤ構成部材の成形方法であって、
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、
前記押出機の内部に6MPa以上の圧力でゴムを滞留させることにより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構成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構成部材の成形方法。 A step of kneading non-vulcanizable rubber;
A step of continuously kneading the non-vulcanizable rubber with an extruder, and a molding method of a tire constituent member ,
The process by the extruder
Supplying vulcanized chemicals and continuously kneading vulcanizable rubber;
Aging the vulcanizable rubber by retaining the rubber at a pressure of 6 MPa or more inside the extruder ;
Method of molding a tire component characterized in that it comprises the steps of continuously extruding aged vulcanizable rubber as a tire component member having a predetermined cross-sectional shape, a.
前記ギアポンプによるゴム排出量と前記スクリューによるゴム供給量とに差を設けて前記スクリューと前記ギアポンプとの間の滞留空間にゴムの滞留を発生させ、前記ギアポンプの入口側の圧力が6MPa以上になるように、前記ギアポンプ及び前記スクリューの回転数を制御することで、前記加硫性ゴムを熟成する請求項1又は2に記載のタイヤ構成部材の成形方法。 A difference is generated between the amount of rubber discharged by the gear pump and the amount of rubber supplied by the screw to generate a retention of rubber in the retention space between the screw and the gear pump, and the pressure on the inlet side of the gear pump becomes 6 MPa or more. Thus, the shaping | molding method of the tire structural member of Claim 1 or 2 which matures the said vulcanizable rubber by controlling the rotation speed of the said gear pump and the said screw.
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