WO2013001927A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2013001927A1 WO2013001927A1 PCT/JP2012/062422 JP2012062422W WO2013001927A1 WO 2013001927 A1 WO2013001927 A1 WO 2013001927A1 JP 2012062422 W JP2012062422 W JP 2012062422W WO 2013001927 A1 WO2013001927 A1 WO 2013001927A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thermoplastic resin
- sheet
- elastomer
- pneumatic tire
- tip
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- 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
- B60C5/142—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 provided partially, i.e. not covering the whole inner wall
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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
- B29D30/3007—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
- 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/02—Carcasses
- B60C9/14—Carcasses built-up with sheets, webs, or films of homogeneous material, e.g. synthetics, sheet metal, rubber
-
- 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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/02—Carcasses
- B60C9/14—Carcasses built-up with sheets, webs, or films of homogeneous material, e.g. synthetics, sheet metal, rubber
- B60C2009/145—Carcasses built-up with sheets, webs, or films of homogeneous material, e.g. synthetics, sheet metal, rubber at the inner side of the carcass structure
-
- 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
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/04—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof having annular inlays or covers, e.g. white sidewalls
- B60C2013/045—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof having annular inlays or covers, e.g. white sidewalls comprising different sidewall rubber layers
Definitions
- the present invention relates to a pneumatic tire.
- a sheet comprising a thermoplastic resin or a thermoplastic resin composition obtained by blending a thermoplastic resin and an elastomer is used as a reinforcing sheet for reinforcing a specific portion of the tire or as an inner liner layer.
- the present invention relates to a pneumatic tire excellent in durability without starting cracking or peeling near the end in the tire circumferential direction of the reinforcing sheet or inner liner layer after the pneumatic tire has started running.
- Patent Document 1 a sheet made of a thermoplastic resin or a thermoplastic resin composition obtained by blending a thermoplastic resin and an elastomer is used as a reinforcing sheet or an inner liner layer (air permeation preventive layer) for reinforcing a specific portion of a pneumatic tire.
- Patent Document 2 a sheet made of a thermoplastic resin or a thermoplastic resin composition obtained by blending a thermoplastic resin and an elastomer is used as a reinforcing sheet or an inner liner layer (air permeation preventive layer) for reinforcing a specific portion of a pneumatic tire.
- the sheet may be peeled off from the vicinity of the end after the tire starts running.
- the peeling occurs near the end of the sheet-like material composed of a thermoplastic resin or a thermoplastic resin composition obtained by blending a thermoplastic resin and an elastomer, and the crack generation further progresses as the tire is used. It progresses to the phenomenon that the sheet peels from the main rubber or tie rubber.
- the object of the present invention is to reinforce a sheet-like material made of a thermoplastic resin or a thermoplastic resin composition obtained by blending a thermoplastic resin and an elastomer, to reinforce a specific portion of a pneumatic tire.
- a pneumatic tire used for a sheet or an inner liner layer air permeation prevention layer
- An object of the present invention is to provide a pneumatic tire with excellent durability that does not have a problem.
- the pneumatic tire of the present invention that achieves the above-described object has the following configuration (1).
- a pneumatic tire in which a sheet made of a thermoplastic resin or a thermoplastic resin composition obtained by blending an elastomer in a thermoplastic resin is disposed inside or on the surface of the tire, the elastomer is contained in the thermoplastic resin or thermoplastic resin.
- a pneumatic tire comprising: a sheet made of a thermoplastic resin composition blended with a material, wherein a sheet edge extending along the tire circumferential direction is subjected to a tip sharpening treatment.
- the pneumatic tire of the present invention preferably has any of the following configurations (2) to (7).
- the tip sharpening treatment enters from the tip of a sheet made of the thermoplastic resin or a thermoplastic resin composition obtained by blending an elastomer into the thermoplastic resin, by (t ⁇ 1/3) length inside.
- t average thickness ( ⁇ m) in the tire circumferential direction of the non-tip sharpened portion of the sheet made of a thermoplastic resin or a thermoplastic resin composition obtained by blending an elastomer in a thermoplastic resin
- T the thickness of the sheet ( ⁇ m) at a position that is inward by (t ⁇ 1/3) length from the front end of the sheet made of the thermoplastic resin or a thermoplastic resin composition obtained by blending an elastomer in the thermoplastic resin.
- the sheet is a reinforcing sheet, and heat is obtained by blending an elastomer in the thermoplastic resin or the thermoplastic resin in a region from a position of 50 mm from the belt end to the center side to a position of the upper end of the bead core.
- a sheet or sheet made of a thermoplastic resin or a thermoplastic resin composition obtained by blending a thermoplastic resin and an elastomer is used as a reinforcing sheet or inner for reinforcing a specific portion of a pneumatic tire.
- the pneumatic tire used for the liner layer air permeation prevention layer
- the occurrence of cracks and peeling near the end of the reinforcing sheet or inner liner layer in the tire circumferential direction is good.
- a pneumatic tire that is suppressed and has excellent durability is provided.
- FIG. 1 shows a sheet made of a thermoplastic resin or a thermoplastic resin composition in which a thermoplastic resin and an elastomer are blended in which a sheet end portion extending in the tire circumferential direction used in the present invention is subjected to a tip sharpening treatment. It is sectional drawing in the tire width direction of the sheet
- FIG. 2 (a) shows the end of the sheet in the width direction when a sheet made of a thermoplastic resin composition obtained by blending a thermoplastic resin or a thermoplastic resin and an elastomer is cut into a desired length or shape.
- FIG. 1 shows a sheet made of a thermoplastic resin or a thermoplastic resin composition in which a thermoplastic resin and an elastomer are blended in which a sheet end portion extending in the tire circumferential direction used in the present invention is subjected to a tip sharpening treatment. It is sectional drawing in the
- FIG. 2B is a model diagram showing an example of a sheet cutting method that realizes obtaining in a sharpened state
- FIG. 2B shows a heat cutter and a thermoplastic resin or a thermoplastic resin composition by the cutting method.
- seat is shown in model.
- 3 (a), 3 (b), and 3 (c) all show a sheet-like product made of a thermoplastic resin or a thermoplastic resin composition obtained by blending a thermoplastic resin and an elastomer in the present invention inside or on the surface of the tire.
- FIG. 3 is a tire meridian direction cross-sectional view schematically showing a preferable arrangement position when arranging.
- the pneumatic tire of the present invention is a pneumatic tire in which a sheet made of a thermoplastic resin or a thermoplastic resin composition obtained by blending an elastomer in a thermoplastic resin is disposed in the tire or in the surface portion.
- a sheet made of a thermoplastic resin composition obtained by blending an elastomer in a plastic resin a sheet formed by sharpening the end of a sheet extending along the tire circumferential direction is used.
- thermoplastic resin or a sheet made of a thermoplastic resin composition in which an elastomer is blended with a thermoplastic resin is a reinforcing sheet or an inner liner layer (air permeable layer) for reinforcing a specific portion of a pneumatic tire.
- a sheet used as a member constituting the prevention layer is a reinforcing sheet or an inner liner layer (air permeable layer) for reinforcing a specific portion of a pneumatic tire.
- a sheet of a thermoplastic resin or a thermoplastic resin composition in which an elastomer is blended in a thermoplastic resin has a tip end of the sheet end in the tire circumferential direction.
- the tip sharpening process has been performed means that the tip sharpening process part 2 that has been sharpened and gradually becomes narrower toward the tip as shown in FIG. 1A.
- the sheet is subjected to physical or chemical treatment or treatment of both or a combination of treatment and thermal treatment in the tire circumferential direction. This is what is done to the end.
- the cross section is perpendicular to the sheet when viewed as a cut surface view in the width direction of the sheet as shown in FIG. A configuration having a cut end face C is provided.
- the tip sharpening treatment for the end portion in the tire circumferential direction may be performed by the sheet alone, or when used in a tire laminated with tie rubber or the like,
- the laminated body may be laminated together after being laminated with tie rubber or the like.
- Shape that has been sharpened and gradually becomes narrower toward the leading edge may have a degree of “roundness” in the vicinity of the leading edge of the sheet. Even if it exists only, the prevention effect of the generation
- the tip sharpening treatment at the tip of the sheet is effective even when it is rounded.
- the tip sharpening treatment is performed using a thermoplastic resin.
- the thickness T ( ⁇ m) is 0.1 t at a position that is inward (t ⁇ 1/3) length from the front end of a sheet made of a thermoplastic resin composition in which an elastomer is blended with a thermoplastic resin. It is preferable to have a relationship satisfying ⁇ T ⁇ 0.8t.
- FIG. 1A shows this relationship, and specifies the relationship regarding the level of the thickness at a position inward by (t / 3) from the tip. More preferably, 0.2t ⁇ T ⁇ 0.6t.
- t is an average thickness ( ⁇ m) in the tire circumferential direction of a non-tip sharpened portion of a sheet made of a thermoplastic resin or a thermoplastic resin composition obtained by blending an elastomer in a thermoplastic resin
- T is The thickness of the sheet ( ⁇ m) at a position that is inward by (t ⁇ 1/3) length from the front end of the sheet made of the thermoplastic resin or a thermoplastic resin composition in which an elastomer is blended in the thermoplastic resin.
- the shape of the tip sharpened portion is preferably a cross-sectional shape as shown in FIG. 1A and a clean taper shape, but the effect can be exhibited even if it is not a clean taper shape.
- An asymmetric taper shape a shape that is sharpened in a taper shape and curved in one direction (for example, the main rubber side or the tie rubber layer side), a form having some unevenness, It may be the one that is rounded as described above.
- the tip sharpening process to the tip of the end portion extending in the circumferential direction of the sheet is performed by, for example, pulling out a required length of the sheet from a roll-shaped wound body and applying a tension while applying tension to the sheet.
- Perform heat cutting by applying a heat cutter such as a heat ray, or perform a chemical dissolution treatment such as alkali or acid on the cutting end surface in the direction of the tire circumferential direction of the sheet after cutting with a normal blade, Alternatively, it can be performed by performing physical treatment such as various kinds of polishing using a grinder or a file.
- thermoplastic resin composition in which an elastomer is blended in a thermoplastic resin
- heat is applied to the surface of the tip portion subjected to the tip sharpening treatment. Since the thermoplastic resin is cut while flowing, the phenomenon that the elastomer existing on the surface in the vicinity of the cut end is covered with the thermoplastic resin coating is generated. Since the sheet obtained in this way has a stronger vulcanized adhesion state compared to the case where the elastomer is exposed and vulcanized and bonded, the occurrence of cracks and peeling as described above is also obtained in this respect. It is more effective in preventing.
- the elastomer inhibits vulcanization adhesion, and vulcanization adhesion between the sheet of the thermoplastic resin composition and the main body rubber or tie rubber. Since the force is lowered, it is preferable to sharpen the tip so that the elastomer is not exposed as much as possible, and the above-described thermal cutting method is preferable in this respect. In the case of adopting the thermal cutting method, it is preferable that the thermoplastic resin melted and fluidized by the heat of the thermal cutting is thermally cut under a condition that can sufficiently cover all of the elastomer on the cut surface.
- thermoplastic resin composition may be deteriorated, which is not preferable.
- the thermal cutting is preferably performed using a heat cutter or using laser light. It is important to heat cut while applying heat and applying tension, and further, it may be cut by applying pressure and applying a heat cutter.
- an ultrasonic cutter, a high-frequency cutter, or the like can be used in the same manner.
- the effect of “the phenomenon that is obtained when the elastomer existing on the surface near the cutting edge is covered with a thermoplastic resin film” by the above-described thermal cutting is the effect of cutting the end without cutting heat.
- the tip sharpening process is performed by appropriately applying hot air, a heating plate or a heating roller, it can be obtained simultaneously with the process.
- FIG. 2A shows that when the sheet 1 made of a thermoplastic resin or a thermoplastic resin composition is cut into a desired length or shape, the tip of the sheet 1 made of a thermoplastic resin or a thermoplastic resin composition is It is the model figure which showed one example of the cutting
- the heat cutter 3 is inclined at an inclination angle ⁇ in the direction corresponding to the tire width direction of the seat 1, and proceeds in the traveling direction (arrow D direction) of the heat cutter 8, which is also the direction corresponding to the tire circumferential direction (arrow A) of the seat.
- An example is shown in which heat fusing is performed.
- FIG. 4B schematically shows the relationship between the heat cutter 3 by the cutting method and the form of the front end portion of the sheet 1 of the thermoplastic resin or thermoplastic resin composition.
- the front end of the sheet is the cut end.
- the tip is sharpened at the part.
- the inclination angle ⁇ is preferably in the range of 30 to 60 degrees.
- the present invention when using the above-mentioned sheet as a reinforcing sheet for reinforcing a specific portion of the pneumatic tire, it is effective to use it particularly in a portion where a large strain is repeatedly applied during traveling. At least a part of the sheet in a region starting from a position of 50 mm from the end of the belt having the maximum belt width to the center (tire equator) side and starting from that position toward the bead side and ending at the upper end position of the bead core Or it is preferable to arrange
- the portion where the reinforcing sheet is preferably disposed is a portion called a tire shoulder portion and a sidewall portion, which is relatively fixed and does not receive a large strain from the upper end position of the bead core. It is effective to reinforce the shoulder portion from the side toward the (tire equator) side.
- this reinforcing layer it may be disposed inside the tire or may be used on the tire surface portion (both the outer surface and the lumen side surface).
- the inner liner layer air permeation preventive layer
- it may be disposed at a position where it is disposed as a normal inner liner layer. In that case, you may make it use the sheet
- FIG. 3 (a) to 3 (c) show examples of these various uses
- FIG. 3 (a) shows an example in which the above-described sheet 1 is disposed on the inner surface of the tire.
- An example in which the seat 1 described above is disposed within a range starting from a position on the tire outer periphery side of about 40 mm from the bead toe tip and exceeding the tire equator and having a position on the tire outer periphery side of about 40 mm from the opposite bead toe tip.
- Reference numeral 5 denotes a bead portion
- 6 denotes a bead core.
- FIG. 3B is an example in which the above-described seat 1 is disposed inside the tire, and at least a position that enters the center side 20 mm from the belt end 8 of the maximum width on the tire outer peripheral side of the inner liner 7 is a starting point.
- the above-described sheet 1 is disposed in a range passing through the shoulder portion and the sidewall portion and having the upper end of the bead core 6 as an end point.
- the inner liner 7 may be made of butyl rubber or a sheet made of a thermoplastic resin or a thermoplastic resin composition obtained by blending an elastomer in a thermoplastic resin.
- FIG. 3C is an example in which the above-described seat 1 is disposed on the outer surface of the tire, and at least the position where the belt end 8 enters the 30 mm bead side from the belt end 8 having the maximum width is used as a starting point. As shown, an example in which the above-described sheet 1 is disposed within a range having the upper end of the bead core 6 as an end point is shown.
- the thickness of the sheet is preferably 0.03 to 0.3 mm.
- the thickness when used as a reinforcing sheet, the thickness is preferably 0.1 to 0.3 mm, or when used as a sheet constituting the inner liner layer, the thickness is 0.03. It is preferably 0.15 mm.
- thermoplastic resin examples include polyamide resins [for example, nylon 6 (N6), nylon 66 (N66), nylon 46 (N46), nylon 11 (N11), nylon 12 (N12). , Nylon 610 (N610), nylon 612 (N612), nylon 6/66 copolymer (N6 / 66), nylon 6/66/610 copolymer (N6 / 66/610), nylon MXD6 (MXD6), nylon 6T, nylon 9T, nylon 6 / 6T copolymer, nylon 66 / PP copolymer, nylon 66 / PPS copolymer] and their N-alkoxyalkylated products, such as methoxymethylated products of nylon 6, nylon 6 / 610 copolymer methoxymethylated product, nylon 612 methoxymethylated product, polyester Resin (for example, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), PET
- PET polybutylene ter
- thermoplastic resin and the elastomer constituting the thermoplastic resin composition that can be used in the present invention
- the elastomer include diene rubber and hydrogenated products thereof [for example, natural rubber (NR), isoprene rubber (IR), epoxidized natural rubber, styrene butadiene rubber (SBR), butadiene rubber (BR, high cis BR and Low cis BR), nitrile rubber (NBR), hydrogenated NBR, hydrogenated SBR], olefin rubber [eg, ethylene propylene rubber (EPDM, EPM), maleic acid modified ethylene propylene rubber (M-EPM), butyl rubber (IIR) ), Isobutylene and aromatic vinyl or diene monomer copolymer, acrylic rubber (ACM), ionomer], halogen-containing rubber [for example, Br-IIR, CI-IIR, brominated isobutylene-p-
- Such a compatibilizing agent generally includes a copolymer having a structure of both or one of a thermoplastic resin and an elastomer, or an epoxy group, a carbonyl group, a halogen group, and an amino group that can react with the thermoplastic resin or elastomer.
- a copolymer having a oxazoline group, a hydroxyl group and the like can be taken.
- thermoplastic resin and elastomer may be selected depending on the type of thermoplastic resin and elastomer to be blended, but those commonly used include styrene / ethylene butylene block copolymer (SEBS) and its maleic acid modification, EPDM, EPM, EPDM / styrene or EPDM / acrylonitrile graft copolymer and its modified maleic acid, styrene / maleic acid copolymer, reactive phenoxin and the like can be mentioned.
- SEBS styrene / ethylene butylene block copolymer
- the amount of the compatibilizing agent is not particularly limited, but is preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the polymer component (the total of the thermoplastic resin and the elastomer).
- thermoplastic resin composition in which the thermoplastic resin and the elastomer are blended, the composition ratio of the specific thermoplastic resin and the elastomer is not particularly limited, and the elastomer is used as a discontinuous phase in the thermoplastic resin matrix. What is necessary is just to determine suitably so that it may have a dispersed structure, and a preferable range is 90/10-30/70 weight ratio.
- thermoplastic resin or a thermoplastic resin composition obtained by blending a thermoplastic resin and an elastomer is mixed with another polymer such as a compatibilizer as long as it does not impair the necessary properties as a reinforcing sheet or an inner liner. can do.
- a compatibilizer such as a compatibilizer as long as it does not impair the necessary properties as a reinforcing sheet or an inner liner. can do.
- the purpose of mixing other polymers is to improve the compatibility between the thermoplastic resin and the elastomer, to improve the molding processability of the material, to improve the heat resistance, to reduce the cost, etc.
- the material that can be used include polyethylene (PE), polypropylene (PP), polystyrene (PS), ABS, SBS, and polycarbonate (PC).
- thermoplastic resin composition has a structure in which an elastomer is dispersed as a discontinuous phase in a matrix of a thermoplastic resin.
- the Young's modulus of the thermoplastic resin and elastomer that can be used in the present invention is not particularly limited, but both are preferably 1 to 500 MPa, more preferably 50 to 500 MPa.
- 215 / 70R15 98H was used as a test tire, and two tires were produced for each example and comparative example, which were attached to a JATMA standard rim 15 ⁇ 6.5JJ, and the tire internal pressure was set to 170 kPa.
- Each pneumatic tire was run for 50,000 km at 7.35 kN, and then the presence or absence of cracks in each test tire was checked. Further, after running 50,000 km (after running a total of 100,000 km), the presence or absence of cracks in each test tire was confirmed.
- each end of the cylindrical sheet (produced as a continuous length), which is the circumferential edge of the tire, is in the form shown in FIG. A heat cut with an angle ⁇ of 30 degrees and a cutter speed of 5 cm / sec.
- the tip is sharpened by applying the blade diagonally while melting the tip of the entire circumference. It is.
- the thickness t ( ⁇ m) of the sheet is 150 ⁇ m
- the thickness of the sheet is 50 ⁇ m inside (t ⁇ 1/3) from the front end of the sheet.
- T was 35 ⁇ m.
- Example 1 and Comparative Example 1 were used in the manner shown in FIG. 3A
- Example 2 and Comparative Example 2 were used in the manner shown in FIG. 3B
- Example 3 and Comparative Example 3 were used. Is the usage of the embodiment shown in FIG.
- the tires of Examples 1 to 3 of the present invention are remarkably superior in durability as compared with those of Comparative Examples 1 to 3, respectively.
- thermoplastic resin or thermoplastic resin composition in which a thermoplastic resin and an elastomer are blended 2: Part sharpened 3: Heat cutter 4: Tread part 5: Bead part 6: Bead core 7: Inner liner Layer A: Tire circumferential direction B: Tire width direction L: Length of the tip sharpened portion T: From the tip of a sheet made of a thermoplastic resin or a thermoplastic resin composition obtained by blending an elastomer in a thermoplastic resin , (T x 1/3) sheet thickness ( ⁇ m) at the position inside the length t: tire circumferential direction average thickness ( ⁇ m) of a non-tip sharpened portion of a sheet made of a thermoplastic resin or a thermoplastic resin composition obtained by blending an elastomer in a thermoplastic resin
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Abstract
Description
(1)熱可塑性樹脂または熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートをタイヤ内部または表面部に配設した空気入りタイヤにおいて、該熱可塑性樹脂または熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートとして、タイヤ周方向に沿って延在するシート端部が先端先鋭化処理されてなるものを用いてなることを特徴とする空気入りタイヤ。
(2)前記先端先鋭化処理が、前記熱可塑性樹脂または前記熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートの先端から、(t×1/3)長さ分内側に入った位置で、厚さT(μm)が、0.1t≦T≦0.8tを満足する関係を有することを特徴とする上記(1)記載の空気入りタイヤ。
ここで、t:熱可塑性樹脂または熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートの非先端先鋭化処理部分のタイヤ周方向平均厚さ(μm)
T:熱可塑性樹脂または熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートの先端から、(t×1/3)長さ分内側に入った位置でのシートの厚さ(μm)
(3)前記先端先鋭化処理された部分の長さLが、L=(1.0~20)×t(μm)長さ分内側に入った位置まであることを特徴とする上記(1)または(2)記載の空気入りタイヤ。
(4)前記先端先鋭化処理された部分の長さLが、L=(1.0~2.5)×t(μm)長さ分、先端から内側に入った位置まであることを特徴とする上記(1)~(3)のいずれかに記載の空気入りタイヤ。
(5)前記シートが補強シートであり、ベルト端部からセンター側に50mmの位置から、ビードコアの上端の位置までの領域内に、該熱可塑性樹脂または前記熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなる前記補強シートが配設されてなることを特徴とする上記(1)~(4)のいずれかに記載の空気入りタイヤ。
(6)前記シートがインナーライナー層として配設されてなることを特徴とする上記(1)~(4)のいずれかに記載の空気入りタイヤ。
(7)前記シートの厚さが0.03~0.3mmであることを特徴とする上記(1)~(6)のいずれかに記載の空気入りタイヤ。
以下、実施例などにより、本発明の空気入りタイヤについて具体的に説明する。
2:先端先鋭化処理されている部分
3:ヒートカッタ
4:トレッド部
5:ビード部
6:ビードコア
7:インナーライナー層
A:タイヤ周方向
B:タイヤ幅方向
L:先端先鋭化処理されている部分の長さ
T:熱可塑性樹脂または熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートの先端から、(t×1/3)長さ分内側に入った位置でのシートの厚さ(μm)
t:熱可塑性樹脂または熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートの非先端先鋭化処理部分のタイヤ周方向平均厚さ(μm)
Claims (7)
- 熱可塑性樹脂または熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートをタイヤ内部または表面部に配設した空気入りタイヤにおいて、該熱可塑性樹脂または熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートとして、タイヤ周方向に沿って延在するシート端部が先端先鋭化処理されてなるものを用いてなることを特徴とする空気入りタイヤ。
- 前記先端先鋭化処理が、前記熱可塑性樹脂または前記熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートの先端から、(t×1/3)長さ分内側に入った位置で、厚さT(μm)が、0.1t≦T≦0.8tを満足する関係を有することを特徴とする請求項1記載の空気入りタイヤ。
ここで、t:熱可塑性樹脂または熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートの非先端先鋭化処理部分のタイヤ周方向平均厚さ(μm)
T:熱可塑性樹脂または熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなるシートの先端から、(t×1/3)長さ分内側に入った位置でのシート2の厚さ(μm) - 前記先端先鋭化処理された部分の長さLが、L=(1.0~20)×t(μm)長さ分内側に入った位置まであることを特徴とする請求項1または2記載の空気入りタイヤ。
- 前記先端先鋭化処理された部分の長さLが、L=(1.0~2.5)×t(μm)長さ分、先端から内側に入った位置まであることを特徴とする請求項1~3のいずれかに記載の空気入りタイヤ。
- 前記シートが補強シートであり、ベルト端部からセンター側に50mmの位置から、ビードコアの上端の位置までの領域内に、該熱可塑性樹脂または前記熱可塑性樹脂中にエラストマーをブレンドした熱可塑性樹脂組成物からなる前記補強シートが配設されてなることを特徴とする請求項1~4のいずれかに記載の空気入りタイヤ。
- 前記シートがインナーライナー層として配設されてなることを特徴とする請求項1~4のいずれかに記載の空気入りタイヤ。
- 前記シートの厚さが0.03~0.3mmであることを特徴とする請求項1~6のいずれかに記載の空気入りタイヤ。
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