WO2010001901A1 - Method of forming green tire - Google Patents

Method of forming green tire Download PDF

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Publication number
WO2010001901A1
WO2010001901A1 PCT/JP2009/061979 JP2009061979W WO2010001901A1 WO 2010001901 A1 WO2010001901 A1 WO 2010001901A1 JP 2009061979 W JP2009061979 W JP 2009061979W WO 2010001901 A1 WO2010001901 A1 WO 2010001901A1
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WO
WIPO (PCT)
Prior art keywords
inner liner
winding
mold
rubber sheet
laminate
Prior art date
Application number
PCT/JP2009/061979
Other languages
French (fr)
Japanese (ja)
Inventor
陽一朗 近藤
Original Assignee
株式会社ブリヂストン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2010001901A1 publication Critical patent/WO2010001901A1/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
    • 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
    • B29D30/3007—Applying the layers; Guiding or stretching the layers during application by feeding a sheet perpendicular to the drum axis and joining the ends to form an annular element
    • 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)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0008—Compositions of the inner liner
    • 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
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
    • B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
    • 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)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B29D2030/0682—Inner liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • 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
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
    • B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
    • B60C2005/145—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre made of laminated layers
    • 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
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
    • B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
    • B60C2005/147—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre characterised by the joint or splice

Definitions

  • the present invention relates to a green tire molding method, and more particularly to a green tire molding method for manufacturing a tire using a gas barrier thin film film inner liner made of a thermoplastic resin material as an inner liner of a product tire.
  • the present invention proposes a technique in which a thin film inner liner is always appropriately and simply and quickly wound and arranged at a predetermined position on a mold.
  • the inner liner As an inner liner that is applied to the inner surface of a tire and functions as an air permeation preventive layer, a rubber layer mainly composed of butyl rubber has been widely used conventionally. However, in recent years, for example, it is disclosed in Patent Document 1 Thus, for the purpose of reducing the weight of the tire and the like, it has been proposed that the inner liner is formed of a single, gas barrier thin film thermoplastic resin film.
  • thermoplastic resin film does not have the adhesive strength like a rubber member, when a belt-shaped thermoplastic resin film having a flat shape is wound around a mold to form an inner liner material, the winding is performed. There is a problem that the winding end of the thermoplastic resin film may be loosened midway, and the positioning of the winding end at a predetermined position on the peripheral surface of the mold is not easy. Therefore, Patent Document 2 proposes a technique of forming a thermoplastic resin film forming an inner liner material into a cylindrical shape without a joint portion.
  • thermoplastic resin film that forms the inner liner material is pre-formed into a cylindrical shape without a joint, a thermoplastic resin film having various cylindrical dimensions corresponding to the circumference of the green tire to be molded is prepared in advance. It becomes necessary to do. Therefore, in addition to the problem of increasing the cost of the cylindrical thermoplastic resin film, inventories of many types of films are unavoidable, and in addition to an increase in inventory management costs, there is also a problem that the production efficiency is lowered. .
  • the layer including the thin resin film layer is backed by the rubber-like elastic body layer, thereby facilitating the handling of the layer including the thin resin film layer and winding the laminate on the mold.
  • the other end of the laminate is overlapped and bonded to one end via another adhesive layer, so that unintentional peeling of the overlapping bonded portion of the layer including the resin film layer, etc. The fear can be advantageously removed. And there exists an advantage that the stock and stock management of many types of resin films can be made unnecessary.
  • the present invention has been made to solve such problems of the prior art, and the object of the present invention is, for example, a gas barrier property that becomes a single layer or a laminated structure of a thermoplastic resin film.
  • the film inner liner is easy to handle, and the laminate of the film inner liner and rubber sheet is specially used for joining the winding start end and winding end to the peripheral surface of the mold This eliminates the need for the application of an adhesive layer, transfer lamination, etc., effectively preventing an increase in the number of work steps and the amount of adhesive used, and at the same time, the winding start end of the laminate on the peripheral surface of the mold
  • An object of the present invention is to provide a green tire molding method in which a predetermined positioning arrangement is sufficiently simple.
  • the raw tire molding method according to the present invention includes, for example, a gas barrier thin film film inner liner and an unvulcanized adjacent rubber sheet, both of which have the same width, and their respective edge positions in the length direction.
  • a gas barrier thin film film inner liner and an unvulcanized adjacent rubber sheet both of which have the same width, and their respective edge positions in the length direction.
  • the winding of the laminate is started with the protruding portion directly or indirectly adhered to the surface of the mold, and the winding end portion of the laminate with respect to the mold is the same or other Laminate winding Insert into the inner peripheral side of the start end, and directly connect the end portions of the thin film inner liner and the end portions of the unvulcanized adjacent rubber sheet at positions spaced in the circumferential direction of the mold. In particular, it is in superposition or butt joining. This molding method is also possible when the width of the thin film inner liner and the unvulcanized rubber sheet are not uniform.
  • the direct overlap bonding between the end portions of the film inner liner is an adhesive on the winding end portion side formed on the film inner liner so that the film inner liner is adhered to the unvulcanized adjacent rubber sheet. It can be performed by joining the winding start end portion side on the layer.
  • the gas barrier thin film film inner liner is obtained by adding an adhesive layer, for example, over the entire surface of the single layer or laminated structure of the thermoplastic resin film to the rubber sheet.
  • the resin material of the film inner liner has a Young's modulus at 23 ° C. in a matrix composed of a modified ethylene-vinyl alcohol copolymer obtained by reacting an ethylene-vinyl alcohol copolymer. It is preferable to include at least a layer made of a resin composition in which a flexible resin smaller than the ethylene-vinyl alcohol copolymer is dispersed.
  • an auxiliary layer made of an elastomer is further provided adjacent to the layer made of the resin composition, the thickness of the layer made of the resin composition is made 100 ⁇ m or less, the resin composition It is preferable that at least one adhesive layer is provided between at least one portion between the layer made of an object and the auxiliary layer and between the auxiliary layer and the auxiliary layer.
  • an adhesive layer which is added to such a thin film inner liner and mainly administers adhesion to an unvulcanized adjacent rubber sheet, it reacts in the molecule with respect to 100 parts by mass of the rubber component. It is preferable to use an adhesive composition in which at least one part of at least one of a maleimide derivative having two or more sites and poly-p-dinitrosobenzene is blended.
  • the thin film-like film inner liner at the winding start end portion of the other laminate and each end portion of the unvulcanized adjacent rubber sheet are spaced apart in the circumferential direction of the mold.
  • Directly overlaid Or butt be joined is preferable for the one of the laminate, and when winding over the entire circumference of the mold, to reduce the differences in junction structure.
  • the end portions of the film inner liner are directly joined to each other by superimposing the winding start end portion side on the adhesive layer on the winding end portion side of the inner liner. Can do.
  • the unvulcanized adjacent rubber sheet can be used only for ensuring the ease of winding of the thin film-like film inner liner on the mold, etc., but it is adjacent to the film inner liner.
  • the rubber sheet is a rubber sheet with an inner liner rubber sheet, a squeegee rubber sheet, or a carcass ply cord embedded therein, which also functions as a functional member of the tire.
  • each of the joining region between the end portions of the unvulcanized rubber sheet and the joining region between the end portions of the thin film inner liner in the same laminate or between different laminates is preferably in the range of 0 to 20 mm and 0 to 60 mm.
  • the separation distance in the circumferential direction of the molding die in each of the joining regions is preferably in the range of 0 to 60 mm.
  • the protrusion protrudes from the edge of the thin film-like film inner liner.
  • the winding end portion of the laminated body with respect to the mold is inserted into the inner peripheral side of the winding start end portion that is pre-adhered to the peripheral surface of the molding die of the same or another laminated body. Therefore, the end portions of the thin film inner liner and the end portions of the unvulcanized adjacent rubber sheets are overlapped and joined, for example, directly at positions spaced in the circumferential direction of the mold. Therefore, the film inner liners can be joined by the adhesive layer provided in advance on the adjacent rubber sheet side, and the adjacent rubber sheets can be joined by the adhesive force of the rubber sheet itself.
  • the joining region between the end portions of the film inner liner and the joining region between the end portions of the adjacent rubber sheets are positioned at an interval in the circumferential direction of the mold.
  • the unvulcanized adjacent rubber sheet is an inner liner rubber sheet, a squeegee rubber sheet, or a rubber sheet in which a carcass ply cord is embedded, which also acts as a functional member of the tire.
  • the purpose is to back the thin film inner liner only, and it is possible to reduce the tire weight compared to the case of using a non-vulcanized adjacent rubber sheet that cannot be a functional member of the tire.
  • the yield of the rubber material can be improved.
  • the circumferential length of the molding die in the joining region between the end portions of the unvulcanized adjacent rubber sheets in the same laminate or between different laminates was set in the range of 0 to 20 mm. In some cases, it is possible to sufficiently secure an adhesive bonding allowance between the rubber sheets.
  • the same length of the joining region between the end portions of the thin film inner liner is in the range of more than 0 mm to 60 mm or less, even if the diameter of the tire or the like is expanded during shaping, vulcanization, etc. It is possible to effectively prevent the occurrence of peeling and cracking on the part.
  • the bonding area of the unvulcanized adjacent rubber sheet exceeds 20 mm, the thickness of the rubber sheet in the overlapping bonding area increases, and thus the uniformity and balance of the product tire cannot be denied.
  • the bonding area of the thin film inner liner exceeds 60 mm, although there is no particular problem in performance, the film material is used unnecessarily, and it is unavoidable that the yield of the material is lowered and the economy is lowered. .
  • the mutual separation distance between the respective joining regions in the circumferential direction of the mold is in the range of 0 to 60 mm, the work of re-attaching the rear end portion of the laminate on the mold is performed. Can be made easier. On the other hand, if the peeling distance exceeds 60 mm, the portion previously attached to the mold is peeled off and re-attached, so that workability is deteriorated and the attaching accuracy may be lowered.
  • FIG. 1 is a perspective view illustrating a laminate that can be used in the practice of the present invention.
  • reference numeral 1 denotes a gas barrier thin film film inner liner which can be made, for example, a single layer or a laminated structure of a thermoplastic resin film.
  • Reference numeral 2 denotes an adhesive layer added over the entire surface or a part of the thin film-like film inner liner 1 on the surface to be bonded to an unvulcanized adjacent rubber sheet described later.
  • Reference numeral 3 denotes a non-added rubber sheet that can be attached to the film inner liner 1 via the adhesive layer 2 and can be a rubber sheet for an inner liner, a rubber sheet for a squeegee rubber, a carcass ply cord embedded therein, or the like.
  • the sulfur adjacent rubber sheet is shown.
  • This laminated body 4 shown here is in a state in which the widths of the film inner liner 1 and the rubber sheet 3 are made uniform while the end positions in the length direction of both of them are shifted from each other in the extending direction.
  • the film inner liner 1 and the rubber sheet 3 are bonded together with the adhesive layer 2 interposed therebetween.
  • variety of the film inner liner 1 and the rubber sheet 3 may not align.
  • the protruding portion of the rubber sheet 3 from the film inner liner 1 is used as the winding start end of the laminate 4 around the mold.
  • the posture is such that the film inner liner 2 is on the inside of the surface of the mold 5.
  • the winding start end portion 4a is adhered to the projecting portion to position the winding start end of the laminate 4 on the surface of the molding die, and on the peripheral surface of the molding die 5 under the rotational displacement of the molding die 5.
  • the laminate 4 is wound around the entire circumference of the mold 5.
  • 4b is inserted into the inner peripheral side of the winding start end portion 4a as schematically shown in FIG. 3, where the end portions of the thin film inner liner 1 are directly connected, for example, directly under the action of the adhesive layer 2.
  • the end portions of the unvulcanized adjacent rubber sheet 3 are directly overlap-bonded with each other under an adhesive force inherent to the rubber sheet 3, for example.
  • the mold 5 is positioned at intervals in the circumferential direction.
  • the gas barrier thin film film inner liner 1 is wound around the peripheral surface of the mold 5 in this manner, thereby facilitating the handling of the thin film film inner liner 1 and applying it to the mold 5.
  • the required winding can be easily performed under high work efficiency. Further, by sticking the protruding portion of the rubber sheet 3 at the winding start end portion of the laminate 4 to the surface of the mold 5, the winding start end of the laminate 4, and consequently the winding start end of the film inner liner 1, , It can be accurately positioned as expected.
  • the end portions of the film inner liner 1 are joined to each other through the adhesive layer 2 for adhering the unvulcanized adjacent rubber sheet 3 to the film inner liner 1, and the unvulcanized adjacent rubber sheet.
  • the resin material of the thin film inner liner 1 is placed in a matrix composed of a modified ethylene-vinyl alcohol copolymer obtained by reacting an ethylene-vinyl alcohol copolymer at 23 ° C. It is preferable to include at least a layer made of a resin composition in which a flexible resin having a Young's modulus smaller than that of the modified ethylene-vinyl alcohol copolymer is dispersed.
  • an auxiliary layer made of an elastomer is further provided adjacent to the layer made of the resin composition, the thickness of the layer made of the resin composition is made 100 ⁇ m or less, and It is preferable that one or more adhesive layers are provided between at least one portion between the layer made of the resin composition and the auxiliary layer and between the auxiliary layer and the auxiliary layer.
  • the adhesive layer 2 for adhering the unvulcanized adjacent rubber sheet 3 is a maleimide derivative having two or more reactive sites in the molecule and poly-p-dinitrosobenzene with respect to 100 parts by mass of the rubber component. It is preferable to use an adhesive composition in which at least one of these is blended in an amount of 0.1 parts by mass or more.
  • the respective laminated bodies 4 are as shown in FIG.
  • the protruding portion of the rubber sheet 3 as a part of the winding start end portion 4a of one laminated body 4 is directly adhered to the surface of the mold 5, and the laminated body 4 is molded.
  • the protruding portion of the rubber sheet 3 as a part of the winding start end portion 4 a of the other laminate 4 is molded via the winding end portion 4 b of the one laminate 4. Indirectly adheres to the surface of the mold 5.
  • the winding start end portion 4a of the other laminated body 4 is compared with the respective end portions of the thin film-like film inner liner 1 and the unvulcanized adjacent rubber sheet 3 of the winding end portion 4b of one laminated body 4.
  • the end portions of the thin film inner liner 1 and the unvulcanized adjacent rubber sheet 3 can be directly overlapped and joined at positions spaced in the circumferential direction of the mold 5, for example. It is preferable to reduce the difference in structure from the case where the laminate 4 is wound around the entire circumference of the mold 5.
  • the circumferential length of the mold 5 in the joining area a between the unvulcanized adjacent rubber sheets 3 is in the range of 0 to 20 mm
  • the similar length of the joining area b between the end portions of the thin film inner liner 1 is preferably in the range of 0 ⁇ b ⁇ 60 mm.
  • the mutual separation distance c in the circumferential direction of the mold 5 as described above is set to a range of 0 to 60 mm when the rear end portion of the laminate is re-applied. Workability can be improved. That is, when it exceeds 60 mm, there is a high possibility that the paste may be damaged or the accuracy may be reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)
  • Tires In General (AREA)

Abstract

A laminate (4) is produced by bonding a thin-film inner liner (1) having gas-barrier properties to an unvulcanized adjacent rubber sheet (3) through an adhesive layer (2) so that the width-direction edges of the liner (1) and sheet (3) are trued up and that the positions of the length-direction edges of the liner (1) have been shifted in an extension direction for the liner (1) and sheet (3) from the positions of the length-direction edges of the sheet (3).  The laminate (4) is wound around the whole periphery of a forming die so that the thin-film inner liner (1) faces inward.  The winding is conducted in the following manner.  That protrudent part of the unvulcanized adjacent rubber sheet (3) which protrudes from the film inner liner (1) is used as part of a winding-on-die initiation end part (4a) of the laminate.  The winding of the laminate (4) is started while keeping the protrudent part adherent to the surface of the forming die.  That winding-on-die termination end part (4b) of the laminate (4) is inserted inside the winding-on-die initiation end part (4a) of the laminate (4).  The end parts of the thin-film inner liner (1) are bonded to each other and the end parts of the unvulcanized adjacent rubber sheet (3) are bonded to each other, in a lap or butt joint arrangement.

Description

生タイヤの成型方法Raw tire molding method
　この発明は、生タイヤの成型方法、なかでも、多くは熱可塑性樹脂材料からなるガスバリア性の薄膜状フィルムインナーライナを、製品タイヤのインナーライナとするタイヤを製造するためのグリーンタイヤの成型方法に関する。とくに、薄膜状のフィルムインナーライナを、成型型に対し、所定の位置に常に適正に、かつ簡易・迅速に巻付け配置する技術を提案するものである。 The present invention relates to a green tire molding method, and more particularly to a green tire molding method for manufacturing a tire using a gas barrier thin film film inner liner made of a thermoplastic resin material as an inner liner of a product tire. . In particular, the present invention proposes a technique in which a thin film inner liner is always appropriately and simply and quickly wound and arranged at a predetermined position on a mold.
　タイヤの内面に適用されて空気透過防止層として機能するインナーライナとしては、ブチルゴムを主成分とするゴム層が従来から広く一般に使用されていたが、近年では、たとえば特許文献１に開示されているように、タイヤの軽量化等を目的として、インナーライナを、単体の、ガスバリア性の薄膜状の熱可塑性樹脂フィルムにて形成することが提案されている。 As an inner liner that is applied to the inner surface of a tire and functions as an air permeation preventive layer, a rubber layer mainly composed of butyl rubber has been widely used conventionally. However, in recent years, for example, it is disclosed in Patent Document 1 Thus, for the purpose of reducing the weight of the tire and the like, it has been proposed that the inner liner is formed of a single, gas barrier thin film thermoplastic resin film.
　しかし、熱可塑性樹脂フィルムはゴム部材のような粘着力を有しないため、平坦な形態を有する帯状の熱可塑性樹脂フィルム単体を成型型の周りに巻付けてインナーライナ素材を形成すると、その巻付け途中で熱可塑性樹脂フィルムの巻付け端の緩みが生じることがあり、巻付け端の成型型周面上の所定位置への位置決め配置が容易ではないという問題があった。そこで、特許文献２には、インナーライナ素材を形成する熱可塑性樹脂フィルムを接合部のない円筒形状に成形する技術が提案されている。 However, since the thermoplastic resin film does not have the adhesive strength like a rubber member, when a belt-shaped thermoplastic resin film having a flat shape is wound around a mold to form an inner liner material, the winding is performed. There is a problem that the winding end of the thermoplastic resin film may be loosened midway, and the positioning of the winding end at a predetermined position on the peripheral surface of the mold is not easy. Therefore, Patent Document 2 proposes a technique of forming a thermoplastic resin film forming an inner liner material into a cylindrical shape without a joint portion.
　ところで、インナーライナ素材を形成する熱可塑性樹脂フィルムを、接合部のない円筒形状に予め成形する場合は、成型される生タイヤの周長に応じた各種の円筒寸法の熱可塑性樹脂フィルムを予め準備することが必要になる。そのため、円筒形状熱可塑性樹脂フィルムのコストが増加するという問題の他に、多数種類のフィルムの在庫が不可避となって、在庫管理コスト等の増加に加え、生産能率が低下するという問題もあった。 By the way, when the thermoplastic resin film that forms the inner liner material is pre-formed into a cylindrical shape without a joint, a thermoplastic resin film having various cylindrical dimensions corresponding to the circumference of the green tire to be molded is prepared in advance. It becomes necessary to do. Therefore, in addition to the problem of increasing the cost of the cylindrical thermoplastic resin film, inventories of many types of films are unavoidable, and in addition to an increase in inventory management costs, there is also a problem that the production efficiency is lowered. .
　このような問題点を解決してなお、帯状をなす薄肉の樹脂フィルムの取り扱いを容易にして、その樹脂フィルムを、成型型の周りにそれの全周にわたって、適正にかつ、簡易・迅速に巻付ける従来技術としては、特許文献３に記載されているように、少なくとも樹脂フィルム層を含む層とゴム状弾性体層とを、接着剤層を介して接合させてなる積層体の一方の端部に、あらかじめ作製した他の接着剤層を転写積層し、該積層体の他方の端部を、他の接着剤層に重ね合わせ貼合わせて得た円管体をタイヤ用部材として用いる技術がある。 Even after solving these problems, it is easy to handle a thin resin film in the form of a belt, and the resin film is wound around the mold properly and simply and quickly around the entire circumference. As a conventional technique to be applied, as described in Patent Document 3, at least one end of a laminate formed by joining a layer including at least a resin film layer and a rubber-like elastic body layer via an adhesive layer In addition, there is a technique of using, as a tire member, a circular pipe obtained by transferring and laminating another adhesive layer prepared in advance and overlaying and bonding the other end of the laminate to the other adhesive layer. .
　これによれば、薄肉の樹脂フィルム層を含む層を、ゴム状弾性体層によって裏打ちすることで、薄肉樹脂フィルム層を含む層の取り扱いを容易にして、その積層体の成型型への巻付けを、すぐれた作業性の下で行うことができるので、生タイヤの成型作業能率が向上することになる。また、積層体の他方の端部を、他の接着剤層を介して一方の端部に重ね合わせて貼合させることで、樹脂フィルム層を含む層の重ね合わせ接合部の意図しない剥離等のおそれを有利に取り除くことができる。そして、多数種類の樹脂フィルムの在庫および在庫管理を不要にできるという利点がある。 According to this, the layer including the thin resin film layer is backed by the rubber-like elastic body layer, thereby facilitating the handling of the layer including the thin resin film layer and winding the laminate on the mold. Can be performed under excellent workability, so that the efficiency of green tire molding work is improved. In addition, the other end of the laminate is overlapped and bonded to one end via another adhesive layer, so that unintentional peeling of the overlapping bonded portion of the layer including the resin film layer, etc. The fear can be advantageously removed. And there exists an advantage that the stock and stock management of many types of resin films can be made unnecessary.
特許第３１２６１４８号公報Japanese Patent No. 3126148 特開２００２－２８３８０８号公報JP 2002-283808 A 特開２００７－２７６６３１号公報JP 2007-276631 A
　しかし、特許文献３に記載された従来技術では、積層体の一方の端部上への、他方の端部の貼合に当っては、その貼合に際して、または事前に、他の接着剤層を、積層体のいずれか一方の端部に転写積層することが必要になるという作業工程上および、接着剤の使用量の上での問題があった。また、積層体の、樹脂フィルム層を含む層を内面側とした成型型周面上への巻付けの開始に当って、積層体の巻付け始端を、成型型の周面上の所定の位置に確実に位置決め配置することが難しいという問題があった。 However, in the prior art described in Patent Document 3, when the other end portion is bonded onto one end portion of the laminate, the other adhesive layer is used at the time of bonding or in advance. There is a problem in the work process that it is necessary to transfer and laminate to one end portion of the laminate and the amount of adhesive used. Further, at the start of winding of the laminate on the mold peripheral surface with the layer including the resin film layer on the inner surface side, the winding start end of the laminate is set at a predetermined position on the peripheral surface of the mold. However, there is a problem that it is difficult to position and arrange reliably.
　この発明は、従来技術が抱えるこのような問題点を解決することを課題としてなされたものであり、その目的とするところは、たとえば、熱可塑性樹脂フィルムの単層もしくは積層構造になる、ガスバリア性の薄膜状フィルムインナーライナの取り扱いを容易にするとともに、そのフィルムインナーライナとゴムシートとの積層体の、成型型の周面への巻付け始端部分と巻付け終端部分との接合のための特別の接着剤層の塗布、転写積層等を不要として、作業工程数および、接着剤の使用量の増加を有効に防止し、併せて、積層体の巻付け始端の、成型型周面上への所定の位置決め配置を十分簡易なものとした生タイヤの成型方法を提供するにある。 The present invention has been made to solve such problems of the prior art, and the object of the present invention is, for example, a gas barrier property that becomes a single layer or a laminated structure of a thermoplastic resin film. The film inner liner is easy to handle, and the laminate of the film inner liner and rubber sheet is specially used for joining the winding start end and winding end to the peripheral surface of the mold This eliminates the need for the application of an adhesive layer, transfer lamination, etc., effectively preventing an increase in the number of work steps and the amount of adhesive used, and at the same time, the winding start end of the laminate on the peripheral surface of the mold An object of the present invention is to provide a green tire molding method in which a predetermined positioning arrangement is sufficiently simple.
　この発明の生タイヤの成型方法は、たとえば、ともに幅を揃えた、ガスバリア性の薄膜状フィルムインナーライナと、未加硫隣接ゴムシートとを、それらのそれぞれの、長さ方向の各端縁位置を、それらの延在方向に相互にずらした状態で、前記フィルムインナーライナが有する接着剤層の介在下で貼着させてなる積層体の一本もしくは複数本を、成型型の全周にわたって、それの周方向に巻付けるに当り、端縁がそのフィルムインナーライナから突出して位置する未加硫隣接ゴムシートのその突出部分を、積層体の、成型型への巻付け始端部分の一部とし、その突出部分を成型型の表面に、直接的もしくは間接的に粘着させた状態で積層体の巻付けを開始し、積層体の、成型型に対する巻付け終端部分を、同一のまたは、他の積層体の巻付け始端部分の内周側へ入れ込んで、薄膜状フィルムインナーライナの端部分どうし、および、未加硫隣接ゴムシートの端部分どうしのそれぞれを、成型型の周方向に間隔をおいた位置で直接的に、重ね合わせもしくは突き合わせ接合させるにある。
　なおこの成型方法は、薄膜状フィルムインナーライナと未加硫ゴムシートとの幅が揃わない場合をも可とするものである。 The raw tire molding method according to the present invention includes, for example, a gas barrier thin film film inner liner and an unvulcanized adjacent rubber sheet, both of which have the same width, and their respective edge positions in the length direction. In a state where they are shifted from each other in the extending direction, one or a plurality of laminates that are stuck under the adhesive layer of the film inner liner, over the entire circumference of the mold, When winding it in the circumferential direction, the protruding portion of the unvulcanized adjacent rubber sheet, the edge of which protrudes from the film inner liner, is defined as a part of the winding start end portion of the laminate on the mold. The winding of the laminate is started with the protruding portion directly or indirectly adhered to the surface of the mold, and the winding end portion of the laminate with respect to the mold is the same or other Laminate winding Insert into the inner peripheral side of the start end, and directly connect the end portions of the thin film inner liner and the end portions of the unvulcanized adjacent rubber sheet at positions spaced in the circumferential direction of the mold. In particular, it is in superposition or butt joining.
This molding method is also possible when the width of the thin film inner liner and the unvulcanized rubber sheet are not uniform.
　この場合、フィルムインナーライナの端部分どうしの直接的な重ね合わせ接合は、そのフィルムインナーライナを未加硫隣接ゴムシートに貼着させるべくフィルムインナーライナに形成した、巻付け終端部分側の接着剤層上に、巻付け始端部分側を接合させることによって行うことができる。 In this case, the direct overlap bonding between the end portions of the film inner liner is an adhesive on the winding end portion side formed on the film inner liner so that the film inner liner is adhered to the unvulcanized adjacent rubber sheet. It can be performed by joining the winding start end portion side on the layer.
　そして、未加硫隣接ゴムシートの端部分どうしの重ね合わせ接合は、そのゴムシートに固有の粘着力の下で、未加硫隣接ゴムシートの巻付け終端部分上に、巻付け始端側の前記突出部分を接合させることによって、また、突き合わせ接合は、これもまた、ゴムシートに固有の粘着力の下で、始終のそれぞれの端面を相互に接合させることによってそれぞれ行うことができる。 Then, the overlapping joining of the end portions of the unvulcanized adjacent rubber sheet is performed on the winding end portion side of the unvulcanized adjacent rubber sheet under the adhesive force inherent to the rubber sheet. By joining the protruding portions, butt joining can also be performed by joining the respective end faces of the beginning and end to each other under the adhesive force inherent to the rubber sheet.
　なおここで、ガスバリア性の薄膜状フィルムインナーライナは、熱可塑性樹脂フィルムの単層もしくは積層構造体の、ゴムシートとの積層面側に、たとえばその全面にわたって接着剤層を付加したものとすることができる。そのフィルムインナーライナの樹脂材料は、より具体的には、エチレン－ビニルアルコール共重合体を反応させて得られる変性エチレン－ビニルアルコール共重合体からなるマトリックス中に、２３℃におけるヤング率が前記変性エチレン－ビニルアルコール共重合体より小さい柔軟樹脂を分散させた樹脂組成物からなる層を少なくとも含むものとすることが好ましい。また、前記樹脂組成物からなる層に隣接して、更にエラストマーからなる補助層を一層以上具えるものとすること、前記樹脂組成物からなる層の厚さを１００μｍ以下とすること、前記樹脂組成物からなる層と補助層との間、及び前記補助層と補助層との間の少なくとも一箇所に、一層以上の接着剤層を具えるものとすることが好ましい。 Here, the gas barrier thin film film inner liner is obtained by adding an adhesive layer, for example, over the entire surface of the single layer or laminated structure of the thermoplastic resin film to the rubber sheet. Can do. More specifically, the resin material of the film inner liner has a Young's modulus at 23 ° C. in a matrix composed of a modified ethylene-vinyl alcohol copolymer obtained by reacting an ethylene-vinyl alcohol copolymer. It is preferable to include at least a layer made of a resin composition in which a flexible resin smaller than the ethylene-vinyl alcohol copolymer is dispersed. Further, an auxiliary layer made of an elastomer is further provided adjacent to the layer made of the resin composition, the thickness of the layer made of the resin composition is made 100 μm or less, the resin composition It is preferable that at least one adhesive layer is provided between at least one portion between the layer made of an object and the auxiliary layer and between the auxiliary layer and the auxiliary layer.
　ここにおいて、このような薄膜状フィルムインナーライナに付加されて、主には、未加硫隣接ゴムシートとの貼着を司る接着剤層としては、ゴム成分１００質量部に対し、分子中に反応部位を二つ以上有するマレイミド誘導体及びポリ―p―ジニトロソベンゼンの少なくとも一種を０．１質量部以上配合した接着剤組成物を用いることが好ましい。 Here, as an adhesive layer which is added to such a thin film inner liner and mainly administers adhesion to an unvulcanized adjacent rubber sheet, it reacts in the molecule with respect to 100 parts by mass of the rubber component. It is preferable to use an adhesive composition in which at least one part of at least one of a maleimide derivative having two or more sites and poly-p-dinitrosobenzene is blended.
　ところで、薄膜状フィルムインナーライナと未加硫隣接ゴムシートとからなる積層体の複数本を、成型型の周りに、それの全周にわたって順次に巻付けるに当っては、一本の積層体の巻付け始端部分の一部としての前記突出部分を成型型の表面に直接的に貼着させる一方、他の積層体の巻付け始端部分の一部としての前記突出部分を、先に、成型型の周方向に向けて巻付けた積層体の巻付け終端部分を介して成型型の表面に間接的に粘着させて、一本の積層体の巻付け終端部分の薄膜状フィルムインナーライナおよび未加硫隣接ゴムシートのそれぞれの端部分に対し、他の積層体の巻付け始端部分の薄膜状フィルムインナーライナおよび未加硫隣接ゴムシートのそれぞれの端部分を、成型型の周方向に間隔をおいた位置で直接的に、重ね合わせもしくは突き合わせ接合させることが、一本の積層体を、成型型の全周にわたって巻付ける場合との、接合構造上の差異を少なくする上で好ましい。
　なお、ここにおいてもまた、フィルムインナーライナの端部分どうしの直接的な接合は、そのインナーライナの、巻付け終端部分側の接着剤層上に、巻付け始端部分側を重ね合わせることによって行うことができる。 By the way, when winding a plurality of laminates composed of a thin film inner liner and an unvulcanized adjacent rubber sheet sequentially around the entire circumference of the mold, The projecting part as a part of the winding start end part is directly attached to the surface of the mold, while the projecting part as a part of the winding start end part of the other laminate is first molded. The thin film-like film inner liner at the winding end portion of one laminate and the non-added film are adhered to the surface of the mold indirectly through the winding end portion of the laminate wound in the circumferential direction. For each end portion of the adjacent rubber sheet, the thin film-like film inner liner at the winding start end portion of the other laminate and each end portion of the unvulcanized adjacent rubber sheet are spaced apart in the circumferential direction of the mold. Directly overlaid Or butt be joined is preferable for the one of the laminate, and when winding over the entire circumference of the mold, to reduce the differences in junction structure.
Here again, the end portions of the film inner liner are directly joined to each other by superimposing the winding start end portion side on the adhesive layer on the winding end portion side of the inner liner. Can do.
　この場合、未加硫隣接ゴムシートは、薄膜状フィルムインナーライナの、成型型への巻付けの容易性等を担保するためだけのものとすることもできるが、そのフィルムインナーライナに隣接させて配置されて、タイヤの機能部材としても作用することになる、インナーライナ用ゴムシート、スキージゴム用ゴムシートもしくは、カーカスプライ用コードを埋設したゴムシートとすることが好ましい。 In this case, the unvulcanized adjacent rubber sheet can be used only for ensuring the ease of winding of the thin film-like film inner liner on the mold, etc., but it is adjacent to the film inner liner. Preferably, the rubber sheet is a rubber sheet with an inner liner rubber sheet, a squeegee rubber sheet, or a carcass ply cord embedded therein, which also functions as a functional member of the tire.
　また好ましくは、同一の積層体内での、または、異なった積層体間での、未加硫ゴムシートの端部分どうしの接合域および、薄膜状フィルムインナーライナの端部分どうしの接合域のそれぞれの、成型型の周方向の長さを０～２０ｍｍおよび、０～６０ｍｍの範囲とすることが好ましい。そして、それらのそれぞれの接合域の、成型型の周方向の離隔距離は、０～６０ｍｍの範囲とすることが好ましい。 Preferably, each of the joining region between the end portions of the unvulcanized rubber sheet and the joining region between the end portions of the thin film inner liner in the same laminate or between different laminates. The circumferential length of the mold is preferably in the range of 0 to 20 mm and 0 to 60 mm. The separation distance in the circumferential direction of the molding die in each of the joining regions is preferably in the range of 0 to 60 mm.
　この発明の成型方法では、相互に貼着された、薄膜状フィルムインナーライナと未加硫隣接ゴムシートとからなる積層体の巻付け始端部分で、薄膜状フィルムインナーライナの端縁より突出して位置する未加硫隣接ゴムシートの突出部分を、そのフィルムインナーライナを内側に向けた姿勢として成型型の周面に粘着させて、その成型型の周りに積層体を巻付けることにより、薄膜状フィルムインナーライナの取り扱いを、未加硫隣接ゴムシートの裏打ちの下で、簡単かつ容易なものとして、フィルムインナーライナの成型型への所要の巻付けを、すぐれた作業性の下で、能率良く行うことができる。 In the molding method of the present invention, at the winding start end portion of the laminated body composed of the thin film-like film inner liner and the unvulcanized adjacent rubber sheet that are adhered to each other, the protrusion protrudes from the edge of the thin film-like film inner liner. By sticking the protruding part of the unvulcanized adjacent rubber sheet to the peripheral surface of the mold with the film inner liner facing inward, and winding the laminate around the mold, a thin film film The inner liner is handled easily and easily under the backing of an unvulcanized adjacent rubber sheet, and the required winding around the mold of the film inner liner is performed efficiently and with excellent workability. be able to.
　そしてこの場合は、未加硫隣接ゴムシートの、フィルムインナーライナからの突出部分を成型型に粘着させることで、積層体、ひいては、薄膜状フィルムインナーライナの巻付け始端の、成型型周面上の所定位置への位置決め配置を十分簡易なものとするとともに、すぐれた位置決め精度を実現することができる。 And in this case, by sticking the protruding portion of the unvulcanized adjacent rubber sheet from the film inner liner to the mold, the laminate, and eventually the winding start of the thin film inner liner, on the mold peripheral surface The positioning and positioning at a predetermined position can be made simple enough, and excellent positioning accuracy can be realized.
　さらにこの方法では、積層体の、成型型に対する巻付け終端部分を、同一のまたは、他の積層体の、成型型周面に予め粘着されている巻付け始端部分の内周側に入れ込んで、そこで、薄膜状フィルムインナーライナの端部分どうし、および、未加硫隣接ゴムシートの端部分どうしのそれぞれを、成型型の周方向に間隔をおいた位置で、たとえば直接的に重ね合わせ接合させることで、フィルムインナーライナどうしは、それの、隣接ゴムシート側に予め設けた接着剤層によって、そして、隣接ゴムシートどうしは、ゴムシートそれ自身の粘着力によって接合させることができるので、積層体のいずれか一方の端部に接着剤を新たに付設することが不要になって、作業工程数の増加および、接着剤の使用量の増加等を効果的に防止することができる。
　従ってここでは、フィルムインナーライナの端部分どうしの接合域と、隣接ゴムシートの端部分どうしの接合域とが、成型型の周方向に間隔をおいて位置することになる。 Furthermore, in this method, the winding end portion of the laminated body with respect to the mold is inserted into the inner peripheral side of the winding start end portion that is pre-adhered to the peripheral surface of the molding die of the same or another laminated body. Therefore, the end portions of the thin film inner liner and the end portions of the unvulcanized adjacent rubber sheets are overlapped and joined, for example, directly at positions spaced in the circumferential direction of the mold. Therefore, the film inner liners can be joined by the adhesive layer provided in advance on the adjacent rubber sheet side, and the adjacent rubber sheets can be joined by the adhesive force of the rubber sheet itself. It is no longer necessary to newly attach an adhesive to one of the ends, and it is possible to effectively prevent an increase in the number of work steps and an increase in the amount of adhesive used. That.
Therefore, here, the joining region between the end portions of the film inner liner and the joining region between the end portions of the adjacent rubber sheets are positioned at an interval in the circumferential direction of the mold.
　以上のような方法の実施のために、成型型の周りに、積層体を一周にわたって巻付けるに当って、複数本の積層体を使用する場合、一本の積層体の巻付け始端部分の一部としての前記突出部分を成型型の周面に直接的に粘着させる一方、他の積層体の巻付け始端部分の一部としての前記突出部分を、先に巻付けた積層体の巻付け終端部分を介して成型型の表面に間接的に粘着させて、一本の積層体の巻付け終端部分の薄膜状フィルムインナーライナおよび未加硫隣接ゴムシートのそれぞれの端部分に対し、他の積層体の巻付け始端部分の薄膜状フィルムインナーライナおよび未加硫隣接ゴムシートのそれぞれの端部分を、成型型の周方向に間隔をおいた位置で直接的に接合させたときは、上述したところと同様の作用効果をもたらすことができ、薄膜状フィルムインナーライナの取り扱いを簡単かつ容易にして、そのフィルムインナーライナの、成型型への所要の巻付けを、高い作業性の下で簡易・迅速に行うとともに、そのフィルムインナーライナの巻付け始端の、成型型周面上への高精度の位置決め配置を簡易に行うことができる。 In order to carry out the above-described method, when a plurality of laminates are used around the mold to wind the laminate around one round, one of the winding start end portions of one laminate is used. While the protruding portion as a part is directly adhered to the peripheral surface of the mold, the winding end of the laminate in which the protruding portion as a part of the winding start end portion of another laminate is wound first Adhering indirectly to the surface of the mold through the part, the other end of the thin film-like film inner liner and the unvulcanized adjacent rubber sheet at the end of winding of one laminate When the end portions of the thin film-like film inner liner and the unvulcanized adjacent rubber sheet at the winding start end portion of the body are directly joined at positions spaced in the circumferential direction of the mold, as described above Can have the same effect as The film inner liner is easily and easily handled, and the film inner liner can be easily and quickly wound around the mold with high workability. It is possible to easily perform positioning and positioning with high accuracy on the peripheral surface of the mold at the winding start end.
　そしてここでもまた、一の積層体の巻付け終端部分と他の積層体の巻付け始端部分との相互の接合に当っての、接着剤の新たな付設が不要となる。 And here again, it is not necessary to add a new adhesive when joining the winding end portion of one laminate and the winding start end portion of another laminate.
　以上に述べたところにおいて、未加硫隣接ゴムシートを、タイヤの機能部材としても作用することになる、インナーライナ用ゴムシート、スキージゴム用ゴムシートもしくは、カーカスプライ用コードを埋設したゴムシートとしたときは、薄膜状フィルムインナーライナの裏打ちだけを目的とするものであって、タイヤの機能部材とはなり得ないものを未加硫隣接ゴムシートとする場合に比して、タイヤ重量の低減を図るとともに、ゴム材料の歩留りの向上を図ることができる。 In the above description, the unvulcanized adjacent rubber sheet is an inner liner rubber sheet, a squeegee rubber sheet, or a rubber sheet in which a carcass ply cord is embedded, which also acts as a functional member of the tire. Sometimes, the purpose is to back the thin film inner liner only, and it is possible to reduce the tire weight compared to the case of using a non-vulcanized adjacent rubber sheet that cannot be a functional member of the tire. In addition, the yield of the rubber material can be improved.
　なお、同一の積層体内での、または、異なった積層体間での、未加硫隣接ゴムシートの端部分どうしの接合域の、成型型の周方向の長さを０～２０ｍｍの範囲としたときは、ゴムシート相互に粘着接合代を十分に確保することができる。薄膜状フィルムインナーライナの端部分どうしの接合域の同様の長さを０ｍｍを越えて６０ｍｍ以下の範囲としたときは、シェーピング、加硫などに際して、タイヤ等に拡径変形が生じても、接合部への剥離、割れ等の発生を有効に防止することができる。
　これに対し、未加硫隣接ゴムシートの接合域が２０ｍｍを越えると、重ね合わせ接合域でのゴムシート厚みが厚くなるため、製品タイヤのユニフォミティ、バランス等の低下が否めなくなる。また、薄膜状フィルムインナーライナの接合域が６０ｍｍを超えると、性能上は特に問題はないものの、不必要にフィルム材料を使用することになり、材料歩留りの低下、経済性の低下等が否めなくなる。 The circumferential length of the molding die in the joining region between the end portions of the unvulcanized adjacent rubber sheets in the same laminate or between different laminates was set in the range of 0 to 20 mm. In some cases, it is possible to sufficiently secure an adhesive bonding allowance between the rubber sheets. When the same length of the joining region between the end portions of the thin film inner liner is in the range of more than 0 mm to 60 mm or less, even if the diameter of the tire or the like is expanded during shaping, vulcanization, etc. It is possible to effectively prevent the occurrence of peeling and cracking on the part.
On the other hand, if the bonding area of the unvulcanized adjacent rubber sheet exceeds 20 mm, the thickness of the rubber sheet in the overlapping bonding area increases, and thus the uniformity and balance of the product tire cannot be denied. In addition, when the bonding area of the thin film inner liner exceeds 60 mm, although there is no particular problem in performance, the film material is used unnecessarily, and it is unavoidable that the yield of the material is lowered and the economy is lowered. .
　そしてまた、上述したようなそれぞれの接合域の相互の、成型型の周方向の離隔距離を０～６０ｍｍの範囲としたときは、積層体の後端部分の、成型型上での貼り直し作業を容易にすることができる。一方、その剥離距離が６０ｍｍを越えると、先に成型型に貼り付けた部分をはがして張り直すため、作業性が悪化し、且つ貼り付け精度が低下するおそれがある。 In addition, when the mutual separation distance between the respective joining regions in the circumferential direction of the mold is in the range of 0 to 60 mm, the work of re-attaching the rear end portion of the laminate on the mold is performed. Can be made easier. On the other hand, if the peeling distance exceeds 60 mm, the portion previously attached to the mold is peeled off and re-attached, so that workability is deteriorated and the attaching accuracy may be lowered.
この発明の実施に用いることができる積層体を跨張して例示する斜視図である。It is a perspective view which straddles the laminated body which can be used for implementation of this invention. この発明の実施の形態を示す巻付け工程図である。It is a winding process figure which shows embodiment of this invention. 巻付け終端部分の、巻付け始端部分の内周側への入れ込み状態を示す模式図である。It is a schematic diagram which shows the insertion state of the winding termination | terminus part to the inner peripheral side of the winding start end part.
　図１はこの発明の実施に用いることができる積層体を跨張して例示する斜視図である。図中１は、たとえば、熱可塑性樹脂フィルムの単層もしくは積層構造とすることができる、ガスバリア性の薄膜状フィルムインナーライナを示す。２は、その薄膜状フィルムインナーライナ１の、後に述べる未加硫隣接ゴムシートへの貼着面に、その全面にわたって、もしくは部分的に付加した接着剤層を示す。 FIG. 1 is a perspective view illustrating a laminate that can be used in the practice of the present invention. In the figure, reference numeral 1 denotes a gas barrier thin film film inner liner which can be made, for example, a single layer or a laminated structure of a thermoplastic resin film. Reference numeral 2 denotes an adhesive layer added over the entire surface or a part of the thin film-like film inner liner 1 on the surface to be bonded to an unvulcanized adjacent rubber sheet described later.
　また３は、フィルムインナーライナ１に、接着剤層２を介して貼着される、インナーライナ用ゴムシート、スキージゴム用ゴムシート、カーカスプライ用コードを埋設したゴムシート等とすることができる未加硫隣接ゴムシートを示す。 Reference numeral 3 denotes a non-added rubber sheet that can be attached to the film inner liner 1 via the adhesive layer 2 and can be a rubber sheet for an inner liner, a rubber sheet for a squeegee rubber, a carcass ply cord embedded therein, or the like. The sulfur adjacent rubber sheet is shown.
　ここで図示のこの積層体４は、フィルムインナーライナ１とゴムシート３との幅を揃える一方で、それら両者の長さ方向の各端位置を、それらの延在方向に相互にずらした状態で、フィルムインナーライナ１とゴムシート３とを、接着剤層２の介在下で貼着させてなる。
　なお、フィルムインナーライナ１とゴムシート３との幅は揃わない場合もある。 This laminated body 4 shown here is in a state in which the widths of the film inner liner 1 and the rubber sheet 3 are made uniform while the end positions in the length direction of both of them are shifted from each other in the extending direction. The film inner liner 1 and the rubber sheet 3 are bonded together with the adhesive layer 2 interposed therebetween.
In addition, the width | variety of the film inner liner 1 and the rubber sheet 3 may not align.
　この発明の実施に当っては、以上のような積層体４の一本もしくは複数本において、ゴムシート３の、フィルムインナーライナ１からの突出部分を、積層体４の成型型への巻付け始端部分４ａの一部とする。このような積層体４のたとえば一本を、図２に示すように成型型５の周面に巻付けるに当っては、成型型５の表面に対し、フィルムインナーライナ２が内側となる姿勢として、巻付け始端部分４ａの前記突出部分で粘着させて、積層体４の巻付け始端を成型型表面に位置決めするとともに、その成型型５の回動変位下で、成型型５の周面上に、積層体４を成型型５の全周にわたって巻付ける。そして、一周にわたるその巻付けの終了に当っては、成型型５の表面に予め粘着させた、積層体巻付け始端部分４ａをそこから一端剥離させた状態で、積層体４の巻付け終端部分４ｂを、図３に模式的に示すように巻付け始端部４ａの内周側に入れ込み、そこで、薄膜状フィルムインナーライナ１の端部分どうしを、接着剤層２の作用下で、たとえば、直接的に重ね合わせ接合させるとともに、未加硫隣接ゴムシート３の端部分どうしを、ゴムシート３に固有の粘着力の下で、たとえば、直接的に重ね合わせ接合させ、これらの両接合を、成型型５の周方向に間隔をおいて位置させる。 In carrying out the present invention, in one or a plurality of the laminates 4 as described above, the protruding portion of the rubber sheet 3 from the film inner liner 1 is used as the winding start end of the laminate 4 around the mold. Let it be a part of part 4a. For example, when one of the laminates 4 is wound around the peripheral surface of the mold 5 as shown in FIG. 2, the posture is such that the film inner liner 2 is on the inside of the surface of the mold 5. The winding start end portion 4a is adhered to the projecting portion to position the winding start end of the laminate 4 on the surface of the molding die, and on the peripheral surface of the molding die 5 under the rotational displacement of the molding die 5. The laminate 4 is wound around the entire circumference of the mold 5. Then, at the end of the winding over one round, the winding end portion of the laminated body 4 in a state where the laminated body winding start end portion 4a, which has been adhered to the surface of the mold 5 in advance, is peeled off from the one end. 4b is inserted into the inner peripheral side of the winding start end portion 4a as schematically shown in FIG. 3, where the end portions of the thin film inner liner 1 are directly connected, for example, directly under the action of the adhesive layer 2. In addition, the end portions of the unvulcanized adjacent rubber sheet 3 are directly overlap-bonded with each other under an adhesive force inherent to the rubber sheet 3, for example. The mold 5 is positioned at intervals in the circumferential direction.
　ガスバリア性の薄膜状フィルムインナーライナ１を、このようにして成型型５の周面に巻付け配置することにより、薄膜状フィルムインナーライナ１の取り扱いを容易にして、それの、成型型５への所要の巻付けを、高い作業能率の下で簡易に行うことができる。また、積層体４の巻付け始端部分の、ゴムシート３の突出部分を成型型５の表面に粘着させることにより、その積層体４の巻付け始端、ひいては、フィルムインナーライナ１の巻付け始端を、所期した通りの位置に正確に位置決めすることができる。 The gas barrier thin film film inner liner 1 is wound around the peripheral surface of the mold 5 in this manner, thereby facilitating the handling of the thin film film inner liner 1 and applying it to the mold 5. The required winding can be easily performed under high work efficiency. Further, by sticking the protruding portion of the rubber sheet 3 at the winding start end portion of the laminate 4 to the surface of the mold 5, the winding start end of the laminate 4, and consequently the winding start end of the film inner liner 1, , It can be accurately positioned as expected.
　またここでは、フィルムインナーライナ１の端部分どうしを、フィルムインナーライナ１への未加硫隣接ゴムシート３の貼着のための接着剤層２を介して接合させるとともに、未加硫隣接ゴムシート３の端部分どうしを、そのゴムシート３に固有の粘着力によって接合させることにより、積層体の端部分どうしの接合のための新たな接着剤の付設を不要にできる利点がある。 Further, here, the end portions of the film inner liner 1 are joined to each other through the adhesive layer 2 for adhering the unvulcanized adjacent rubber sheet 3 to the film inner liner 1, and the unvulcanized adjacent rubber sheet. There is an advantage that it is possible to eliminate the need for providing a new adhesive for joining the end portions of the laminated body by joining the end portions of the three pieces to the rubber sheet 3 with an inherent adhesive force.
　ところで、以上に述べたところにおいて、薄膜状フィルムインナーライナ１の樹脂材料は、エチレン－ビニルアルコール共重合体を反応させて得られる変性エチレン－ビニルアルコール共重合体からなるマトリックス中に、２３℃におけるヤング率が前記変性エチレン－ビニルアルコール共重合体より小さい柔軟樹脂を分散させた樹脂組成物からなる層を少なくとも含むものとすることが好ましい。また、前記樹脂組成物からなる層に隣接して、更にエラストマーからなる補助層を一層以上具えるものとすること、前記樹脂組成物からなる層の厚さを１００μｍ以下とすること、および、前記樹脂組成物からなる層と補助層との間、及び前記補助層と補助層との間の少なくとも一箇所に、一層以上の接着剤層を具えるものとすることが好ましい。 By the way, as described above, the resin material of the thin film inner liner 1 is placed in a matrix composed of a modified ethylene-vinyl alcohol copolymer obtained by reacting an ethylene-vinyl alcohol copolymer at 23 ° C. It is preferable to include at least a layer made of a resin composition in which a flexible resin having a Young's modulus smaller than that of the modified ethylene-vinyl alcohol copolymer is dispersed. Further, an auxiliary layer made of an elastomer is further provided adjacent to the layer made of the resin composition, the thickness of the layer made of the resin composition is made 100 μm or less, and It is preferable that one or more adhesive layers are provided between at least one portion between the layer made of the resin composition and the auxiliary layer and between the auxiliary layer and the auxiliary layer.
　また、未加硫隣接ゴムシート３の貼着のための接着剤層２としては、ゴム成分１００質量部に対し、分子中に反応部位を二つ以上有するマレイミド誘導体及びポリ―p―ジニトロソベンゼンの少なくとも一種を０．１質量部以上配合した接着剤組成物を用いることが好ましい。 The adhesive layer 2 for adhering the unvulcanized adjacent rubber sheet 3 is a maleimide derivative having two or more reactive sites in the molecule and poly-p-dinitrosobenzene with respect to 100 parts by mass of the rubber component. It is preferable to use an adhesive composition in which at least one of these is blended in an amount of 0.1 parts by mass or more.
　なおここで、複数本の積層体４、たとえば二本の積層体４を、成型型５の周面に、それの一周にわたって巻付ける場合は、それぞれの積層体４を、図１に示すように形成したところにおいて、一方の積層体４の巻付け始端部分４ａの一部としての、ゴムシート３の突出部分を、成型型５の表面に直接的に粘着させて、その積層体４を、成型型５の周面に巻付ける一方で、他方の積層体４の巻付け始端部分４ａの一部としてのゴムシート３の突出部分を、一方の積層体４の巻付け終端部分４ｂを介して成型型５の表面に間接的に粘着させる。これによって、一方の積層体４の巻付け終端部分４ｂの、薄膜状フィルムインナーライナ１および未加硫隣接ゴムシート３のそれぞれの端部分に対し、他方の積層体４の巻付け始端部分４ａの、薄膜状フィルムインナーライナ１および未加硫隣接ゴムシート３のそれぞれの端部分を、成型型５の周方向に間隔をおいた位置で、たとえば、直接的に重ね合わせ接合させることが、一本の積層体４を成型型５の全周にわたって、巻付ける場合との、構造上の差異を小さくする上で好ましい。 Here, when a plurality of laminated bodies 4, for example, two laminated bodies 4 are wound around the circumferential surface of the mold 5 over the entire circumference thereof, the respective laminated bodies 4 are as shown in FIG. When formed, the protruding portion of the rubber sheet 3 as a part of the winding start end portion 4a of one laminated body 4 is directly adhered to the surface of the mold 5, and the laminated body 4 is molded. While winding around the peripheral surface of the mold 5, the protruding portion of the rubber sheet 3 as a part of the winding start end portion 4 a of the other laminate 4 is molded via the winding end portion 4 b of the one laminate 4. Indirectly adheres to the surface of the mold 5. As a result, the winding start end portion 4a of the other laminated body 4 is compared with the respective end portions of the thin film-like film inner liner 1 and the unvulcanized adjacent rubber sheet 3 of the winding end portion 4b of one laminated body 4. The end portions of the thin film inner liner 1 and the unvulcanized adjacent rubber sheet 3 can be directly overlapped and joined at positions spaced in the circumferential direction of the mold 5, for example. It is preferable to reduce the difference in structure from the case where the laminate 4 is wound around the entire circumference of the mold 5.
　そして、これらのいずれの巻付け態様を採用する場合にあっても、未加硫隣接ゴムシート３どうしの接合域ａの、成型型５の周方向長さは０～２０ｍｍの範囲とし、また、薄膜状フィルムインナーライナ１の端部分どうしの接合域ｂの同様の長さは０＜ｂ≦６０ｍｍの範囲とすることが好ましい。 And, in the case of adopting any of these winding modes, the circumferential length of the mold 5 in the joining area a between the unvulcanized adjacent rubber sheets 3 is in the range of 0 to 20 mm, The similar length of the joining area b between the end portions of the thin film inner liner 1 is preferably in the range of 0 <b ≦ 60 mm.
　そしてまた、上述したようなそれぞれの接合域の相互の、成型型５の周方向の離隔距離ｃは、０～６０ｍｍの範囲とすることが、積層体の後端部分を、貼り付け直す際の作業性を高めることができる。すなわち、６０ｍｍを越えると貼損じたり精度が低下するおそれが高まることになる。 Further, the mutual separation distance c in the circumferential direction of the mold 5 as described above is set to a range of 0 to 60 mm when the rear end portion of the laminate is re-applied. Workability can be improved. That is, when it exceeds 60 mm, there is a high possibility that the paste may be damaged or the accuracy may be reduced.
１：薄膜状フィルムインナーライナ
２：接着剤層
３：未加硫隣接ゴムシート
４：積層体
４ａ：巻付け始端部分
４ｂ：巻付け終端部分
５：成型型
ａ，ｂ：接合部
ｃ：離隔距離 1: Thin film inner liner 2: Adhesive layer 3: Unvulcanized adjacent rubber sheet 4: Laminate 4a: Winding start end portion 4b: Winding end portion 5: Molding a, b: Joining portion c: Separation distance

Claims (5)

  1. 　ガスバリア性の薄膜状フィルムインナーライナと、未加硫隣接ゴムシートとを、それらのそれぞれの、長さ方向の各端縁位置を、それらの延在方向に相互にずらした状態で、接着剤層の介在下で貼着させてなる積層体の一本以上を、成型型の周りに、薄膜状フィルムインナーライナが内側となる姿勢で、成型型の全周にわたって巻付けるに当り、端縁がそのフィルムインナーライナから突出して位置する未加硫隣接ゴムシートのその突出部分を、積層体の、成型型への巻付け始端部分の一部とし、その突出部分を成型型の表面に粘着させた状態で積層体の巻付けを開始し、積層体の、成型型に対する巻付け終端部分を、同一のまたは、他の積層体の巻付け始端部分の内周側に入れ込んで、薄膜状フィルムインナーライナの端部分どうし、および、未加硫隣接ゴムシートの端部分どうしのそれぞれを、成型型の周方向に間隔をおいた位置で直接的に、重ね合わせもしくは突き合わせ接合させる生タイヤの成型方法。 A gas barrier thin film inner liner and an unvulcanized adjacent rubber sheet, with their respective edge positions in the length direction being shifted from each other in the extending direction, with the adhesive layer When winding one or more laminates, which are pasted in the middle of the mold, around the mold with the thin film film inner liner inside, the edges are The protruding portion of the unvulcanized adjacent rubber sheet that protrudes from the film inner liner is used as a part of the winding start end portion of the laminate on the mold, and the protruding portion is adhered to the surface of the mold Then, the winding of the laminated body is started, and the winding end portion of the laminated body with respect to the mold is inserted into the inner peripheral side of the winding start end portion of the same or another laminated body to form a thin film inner liner. The end parts of the Beauty, each each other end portion of the unvulcanized adjacent rubber sheets directly, the overlay or butt green tire methods molding for joining in spaced locations in the circumferential direction of the mold.
  2. 　複数本の積層体を、成型型の周りに、それの全周にわたって巻付けるに当り、一本の積層体の巻付け始端部分の一部としての前記突出部分を成型型の表面に直接的に粘着させる一方、他の積層体の巻付け始端部分の一部としての前記突出部分を、先に巻付けた積層体の巻付け終端部分を介して成型型の表面に間接的に粘着させて、一本の積層体の巻付け終端部分の薄膜状フィルムインナーライナおよび未加硫隣接ゴムシートのそれぞれの端部分に対し、他の積層体の巻付け始端部分の薄膜状フィルムインナーライナおよび未加硫隣接ゴムシートのそれぞれの端部分を、成型型の周方向に間隔をおいた位置で直接的に、重ね合わせもしくは突き合わせ接合させる請求項１に記載の生タイヤの成型方法。 When winding a plurality of laminates around the mold around the entire circumference, the protruding portion as a part of the winding start end portion of one laminate is directly applied to the surface of the mold. While adhering, the protruding portion as a part of the winding start end portion of the other laminate is indirectly adhered to the surface of the mold through the winding end portion of the laminate wound earlier, The thin film film inner liner and unvulcanized film at the winding start end of the other laminated body for each end part of the thin film film inner liner and unvulcanized adjacent rubber sheet at the winding end part of one laminated body The raw tire molding method according to claim 1, wherein respective end portions of the adjacent rubber sheets are directly overlapped or butted and joined at positions spaced in the circumferential direction of the mold.
  3. 　未加硫隣接ゴムシートを、インナーライナ用ゴムシート、スキージゴム用ゴムシートもしくは、カーカスプライ用コードを埋設したゴムシートとする請求項１もしくは２に記載の生タイヤの成型方法。 3. The raw tire molding method according to claim 1, wherein the unvulcanized adjacent rubber sheet is a rubber sheet for an inner liner, a rubber sheet for a squeegee rubber, or a rubber sheet in which a carcass ply cord is embedded.
  4. 　同一の積層体内での、または、異なった積層体間での、未加硫ゴムシートの端部分どうしの重ね合わせもしくは突き合わせ接合域および、薄膜状フィルムインナーライナの端部分どうしの重ね合わせもしくは突き合わせ接合域のそれぞれの、成型型の周方向の長さを０～２０ｍｍおよび、０ｍｍを越えて６０ｍｍ以下の範囲とする請求項１～３のいずれかに記載の生タイヤの成型方法。 Overlap or butt joint area between end parts of unvulcanized rubber sheet and end part of thin film inner liner in the same laminate or between different laminates The green tire molding method according to any one of claims 1 to 3, wherein the length of each of the regions in the circumferential direction of the molding die is in the range of 0 to 20 mm and more than 0 mm to 60 mm or less.
  5. 　未加硫隣接ゴムシートの端部分どうしの接合域と、薄膜状フィルムインナーライナの端部分どうしの接合域との、成型型の周方向の離隔距離を０～６０ｍｍの範囲とする請求項１～４のいずれかに記載の生タイヤの成型方法。 The circumferential distance of the molding die between the joining area of the end portions of the unvulcanized adjacent rubber sheet and the joining area of the end portions of the thin film inner liner is in the range of 0 to 60 mm. 4. The method for molding a green tire according to any one of 4 above.
PCT/JP2009/061979 2008-06-30 2009-06-30 Method of forming green tire WO2010001901A1 (en)

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