JP2017128255A - Tire deterioration-determining tool, pneumatic tire equipped therewith, tire deterioration-determining method and method for determining tire reclamation possibility - Google Patents

Tire deterioration-determining tool, pneumatic tire equipped therewith, tire deterioration-determining method and method for determining tire reclamation possibility Download PDF

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JP2017128255A
JP2017128255A JP2016009633A JP2016009633A JP2017128255A JP 2017128255 A JP2017128255 A JP 2017128255A JP 2016009633 A JP2016009633 A JP 2016009633A JP 2016009633 A JP2016009633 A JP 2016009633A JP 2017128255 A JP2017128255 A JP 2017128255A
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tire
deterioration
tool
determining
pneumatic
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JP6686465B2 (en
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洋 飯塚
Hiroshi Iizuka
洋 飯塚
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Yokohama Rubber Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a tire deterioration-determining tool capable of determining the deterioration degree of a pneumatic tire in detail by enhancing the discrimination sensitivity of the tool, and to provide a pneumatic tire equipped with the above tool, a tire deterioration-determining method and a method for determining tire reclamation possibility.SOLUTION: A tire deterioration-determining tool 10 comprising the molded body of a rubber composition is configured so that the ratio S/V of a surface area S (mm) of a portion of the molded body 11 excluding a loaded surface to the volume V (mm) of the molded body 11 is 0.1 or more, and the above surface area S is 50 mmor more. Such like tire deterioration-determining tool 10 is loaded on a tire inner face.SELECTED DRAWING: Figure 1

Description

本発明は、タイヤ劣化判定具及びその関連技術に関し、更に詳しくは、タイヤ劣化判定具から識別される劣化度合いの感度を高め、空気入りタイヤの劣化度合いを詳細に判定することを可能にしたタイヤ劣化判定具、タイヤ劣化判定具を備えた空気入りタイヤ、タイヤ劣化判定方法及びタイヤ更生可否判定方法に関する。   The present invention relates to a tire deterioration determination tool and related technology, and more specifically, a tire capable of determining the deterioration degree of a pneumatic tire in detail by increasing the sensitivity of the deterioration level identified from the tire deterioration determination tool. The present invention relates to a deterioration determination tool, a pneumatic tire provided with a tire deterioration determination tool, a tire deterioration determination method, and a tire rehabilitation determination method.

近年、資源の有効活用及び省エネルギーの観点から、空気入りタイヤのトレッド部が摩耗して使用不能の状態になった後、その空気入りタイヤを再生して得られる更生タイヤが普及している。特に、トラックやバスに使用される重荷重用空気入りタイヤについては、更生タイヤが広く使用されている。   In recent years, from the viewpoint of effective utilization of resources and energy saving, retread tires obtained by regenerating a pneumatic tire after the tread portion of the pneumatic tire is worn and becomes unusable have become widespread. In particular, retreaded tires are widely used for heavy duty pneumatic tires used in trucks and buses.

使用済みの空気入りタイヤを更生する場合、トレッドゴムが研削された台タイヤを作製し、その台タイヤに対して新たなトレッドゴムを被覆する。そのような更生作業を行うにあたって、台タイヤの残存耐久性を確認するために、シェアログラフィ検査により内部セパレーションの有無を確認したり、外観検査により外傷の有無を確認したりすることが行われている。しかしながら、このような検査では空気入りタイヤを構成するゴム組成物の劣化度合いを十分に評価することができない。   When a used pneumatic tire is rehabilitated, a base tire in which the tread rubber is ground is produced, and the base tire is covered with a new tread rubber. When performing such rehabilitation work, in order to confirm the remaining durability of the base tire, the presence of internal separation is confirmed by shearography inspection, and the presence or absence of trauma is confirmed by appearance inspection. ing. However, such an inspection cannot sufficiently evaluate the degree of deterioration of the rubber composition constituting the pneumatic tire.

これに対して、硫黄架橋可能なジエン系ゴム組成物からなる芯体ゴムがタイヤのインナーライナー層と同等又はそれ以上の酸素透過係数を有するカバーゴムで被覆されたタイヤ劣化判定具をタイヤ内面に設置し、そのタイヤ劣化判定具の屈曲試験の結果に基づいて空気入りタイヤの劣化度合いを判定することが提案されている（例えば、特許文献１参照）。しかしながら、このようなタイヤ劣化判定具を用いた屈曲試験の結果を参照しても空気入りタイヤの劣化度合いを詳細に判定することができないのが現状である。   On the other hand, a tire deterioration determination tool in which a core rubber made of a sulfur-crosslinkable diene rubber composition is covered with a cover rubber having an oxygen permeability coefficient equal to or higher than that of the inner liner layer of the tire is provided on the inner surface of the tire. It has been proposed to determine the degree of deterioration of a pneumatic tire based on the result of a bending test of the tire deterioration determination tool (see, for example, Patent Document 1). However, the present situation is that the degree of deterioration of a pneumatic tire cannot be determined in detail even with reference to the result of a bending test using such a tire deterioration determination tool.

特開２００６−３２７４６９号公報JP 2006-327469 A

本発明の目的は、タイヤ劣化判定具から識別される劣化度合いの感度を高め、空気入りタイヤの劣化度合いを詳細に判定することを可能にしたタイヤ劣化判定具、タイヤ劣化判定具を備えた空気入りタイヤ、タイヤ劣化判定方法及びタイヤ更生可否判定方法を提供することにある。   An object of the present invention is to increase the sensitivity of the deterioration degree identified from the tire deterioration determination tool, and to determine the deterioration degree of the pneumatic tire in detail, and the air provided with the tire deterioration determination tool It is in providing a entering tire, a tire degradation determination method, and a tire rehabilitation determination method.

上記目的を達成するための本発明のタイヤ劣化判定具は、ゴム組成物の成形体からなるタイヤ劣化判定具であって、前記成形体の被装着面を除く部分の表面積Ｓ（ｍｍ2）と前記成形体の体積Ｖ（ｍｍ3）との比Ｓ／Ｖが０．１以上であり、前記成形体の被装着面を除く部分の表面積Ｓが５０ｍｍ2以上であることを特徴とするものである。 The tire deterioration determination tool of the present invention for achieving the above object is a tire deterioration determination tool made of a molded body of a rubber composition, and has a surface area S (mm 2 ) of a portion excluding the mounting surface of the molded body. The ratio S / V to the volume V (mm 3 ) of the molded body is 0.1 or more, and the surface area S of the portion excluding the mounted surface of the molded body is 50 mm 2 or more. is there.

また、上記目的を達成するための本発明の空気入りタイヤは、上述したタイヤ劣化判定具がタイヤ内面に装着されていることを特徴とするものである。   In addition, a pneumatic tire of the present invention for achieving the above object is characterized in that the tire deterioration determining tool described above is mounted on the inner surface of the tire.

更に、上記目的を達成するための本発明のタイヤ劣化判定方法は、上述したタイヤ劣化判定具を用いたタイヤ劣化判定方法であって、空気入りタイヤの内面に装着されたタイヤ劣化判定具をタイヤ使用開始後の任意の時点で取り外し、その取り外されたタイヤ劣化判定具の物理的特性を測定し、その測定値を用いて前記物理的特性の新品時からの変化量を求め、該変化量に基づいて前記空気入りタイヤの劣化度合いを判定することを特徴とするものである。   Furthermore, the tire deterioration determination method of the present invention for achieving the above object is a tire deterioration determination method using the tire deterioration determination tool described above, and the tire deterioration determination tool mounted on the inner surface of the pneumatic tire is used as a tire. Remove at any time after the start of use, measure the physical characteristics of the removed tire deterioration determination tool, use the measured value to determine the amount of change of the physical characteristics from the new time, to the amount of change Based on this, the degree of deterioration of the pneumatic tire is determined.

更に、上記目的を達成するための本発明のタイヤ更生可否判定方法は、上述したタイヤ劣化判定具を用いたタイヤ更生可否判定方法であって、空気入りタイヤの内部パーツの残存耐久性と前記空気入りタイヤの内面に装着されたタイヤ劣化判定具の物理的特性の新品時からの変化量とを関連付けた判定チャートを用意し、該判定チャートにおいて所定の残存耐久性に対応する前記物理的特性の新品時からの変化量の閾値を決定する一方で、前記空気入りタイヤの内面に装着されたタイヤ劣化判定具をタイヤ更生時に取り外し、その取り外されたタイヤ劣化判定具の物理的特性を測定し、その測定値を用いて前記物理的特性の新品時からの変化量を求め、該変化量の実測値を前記閾値と対比することにより、前記空気入りタイヤが更生可能であるか否かを判定することを特徴とするものである。   Furthermore, the tire rehabilitation determination method of the present invention for achieving the above object is a tire rehabilitation determination method using the above-described tire deterioration determination tool, the remaining durability of the internal parts of the pneumatic tire and the air Preparing a determination chart that correlates the amount of change of the physical characteristics of the tire deterioration determination tool mounted on the inner surface of the entering tire from the time of a new article, the physical characteristics corresponding to a predetermined remaining durability in the determination chart While determining the threshold value of the amount of change from when new, remove the tire deterioration determination tool attached to the inner surface of the pneumatic tire at the time of tire regeneration, measure the physical characteristics of the removed tire deterioration determination tool, The measured value is used to determine the amount of change in the physical characteristics from when it is new, and the measured value of the amount of change is compared with the threshold value, whereby the pneumatic tire can be rehabilitated. It is characterized in determining whether.

本発明のタイヤ劣化判定具によれば、ゴム組成物の成形体の被装着面を除く部分の表面積Ｓを大きくすることで酸素劣化の影響を顕在化させると共に、成形体の被装着面を除く部分の表面積Ｓに対して成形体の体積Ｖを相対的に小さくすることで酸化劣化の影響を顕在化させているので、タイヤ劣化判定具における劣化度合いの感度を高めることができる。そのため、このようなタイヤ劣化判定具をタイヤ内面に装着することにより、空気入りタイヤの劣化度合いを詳細に判定することができる。   According to the tire deterioration determining tool of the present invention, the influence of oxygen deterioration is made obvious by increasing the surface area S of the portion excluding the mounted surface of the molded body of the rubber composition, and the mounted surface of the molded body is removed. Since the influence of oxidative deterioration is made obvious by making the volume V of the molded body relatively small with respect to the surface area S of the portion, the sensitivity of the degree of deterioration in the tire deterioration determination tool can be increased. Therefore, the degree of deterioration of the pneumatic tire can be determined in detail by mounting such a tire deterioration determination tool on the tire inner surface.

本発明のタイヤ劣化判定具において、成形体は凹凸に起伏した表面形状を有することが好ましい。これにより、成形体の表面積Ｓを増大させて劣化度合いの感度を更に高めることができる。   In the tire deterioration determination tool of the present invention, the molded body preferably has a surface shape that is undulated. Thereby, the surface area S of a molded object can be increased and the sensitivity of a deterioration degree can further be improved.

本発明のタイヤ劣化判定具において、成形体はシート状をなし、その最大厚さが０．５ｍｍ〜５．０ｍｍであることが好ましい。これにより、成形体の厚さ方向における劣化進行の不均一性を小さくし、劣化度合いの判定精度を高めることができる。   In the tire deterioration determining tool of the present invention, it is preferable that the molded body has a sheet shape and the maximum thickness is 0.5 mm to 5.0 mm. Thereby, the nonuniformity of the progress of deterioration in the thickness direction of the molded body can be reduced, and the determination accuracy of the degree of deterioration can be increased.

また、本発明の空気入りタイヤによれば、上述したタイヤ劣化判定具がタイヤ内面に装着されているので、その劣化度合いをタイヤ劣化判定具に基づいて詳細に判定することができる。   Further, according to the pneumatic tire of the present invention, since the tire deterioration determining tool described above is mounted on the tire inner surface, the degree of deterioration can be determined in detail based on the tire deterioration determining tool.

本発明の空気入りタイヤにおいて、タイヤ劣化判定具はトレッド幅の中央側７５％の領域又はタイヤ断面高さの２５％以下の領域においてタイヤ内面に装着されていることが好ましい。これら領域ではタイヤ走行時にタイヤ内面が変形し難いため、タイヤ劣化判定具に掛かる歪を低減し、酸素による劣化度合いを精度良く判定することができる。   In the pneumatic tire of the present invention, it is preferable that the tire deterioration determination tool is mounted on the inner surface of the tire in a region of 75% of the center side of the tread width or a region of 25% or less of the tire cross-section height. In these regions, since the tire inner surface is difficult to deform during running of the tire, the strain applied to the tire deterioration determination tool can be reduced, and the degree of deterioration due to oxygen can be accurately determined.

本発明の空気入りタイヤにおいて、タイヤ劣化判定具がタイヤ内面に対して粘着層を介して貼着されていることが好ましい。タイヤ劣化判定具をタイヤ内面に対して粘着層を介して貼着した場合、タイヤ劣化判定具を容易に剥がすことができるので、引き剥がし時に無理な力が負荷されていないタイヤ劣化判定具を用いて劣化度合いを精度良く判定することができる。   In the pneumatic tire of the present invention, it is preferable that the tire deterioration determination tool is attached to the tire inner surface through an adhesive layer. When the tire deterioration determination tool is attached to the tire inner surface via an adhesive layer, the tire deterioration determination tool can be easily peeled off, so use a tire deterioration determination tool that is not loaded with excessive force when peeling off. Thus, the degree of deterioration can be accurately determined.

更に、本発明のタイヤ劣化判定方法によれば、空気入りタイヤの内面に装着されたタイヤ劣化判定具をタイヤ使用開始後の任意の時点で取り外し、その取り外されたタイヤ劣化判定具の物理的特性を測定し、その測定値を用いて物理的特性の新品時からの変化量を求め、該変化量に基づいて空気入りタイヤの劣化度合いを精度良く判定することができる。   Further, according to the tire deterioration determination method of the present invention, the tire deterioration determination tool mounted on the inner surface of the pneumatic tire is removed at any time after the start of tire use, and the physical characteristics of the removed tire deterioration determination tool are removed. , And the measured value is used to determine the amount of change in physical properties from when it is new, and the degree of deterioration of the pneumatic tire can be accurately determined based on the amount of change.

更に、本発明のタイヤ更生可否判定方法によれば、空気入りタイヤの内部パーツの残存耐久性と空気入りタイヤの内面に装着されたタイヤ劣化判定具の物理的特性の新品時からの変化量とを関連付けた判定チャートを用意し、該判定チャートにおいて所定の残存耐久性に対応する物理的特性の新品時からの変化量の閾値を決定する一方で、空気入りタイヤの内面に装着されたタイヤ劣化判定具をタイヤ更生時に取り外し、その取り外されたタイヤ劣化判定具の物理的特性を測定し、その測定値を用いて物理的特性の新品時からの変化量を求め、該変化量の実測値と閾値と対比することにより、空気入りタイヤが更生可能であるか否かを精度良く判定することができる。   Furthermore, according to the tire rehabilitation determination method of the present invention, the remaining durability of the internal parts of the pneumatic tire and the amount of change in the physical characteristics of the tire deterioration determination tool attached to the inner surface of the pneumatic tire from the new time Is prepared, and a threshold value of a change amount of a physical characteristic corresponding to a predetermined remaining durability from a new one is determined in the determination chart, while the tire mounted on the inner surface of the pneumatic tire is deteriorated. Remove the judgment tool at the time of tire retreading, measure the physical characteristics of the removed tire deterioration judgment tool, determine the amount of change of the physical characteristics from the new time using the measured value, By comparing with the threshold value, it can be accurately determined whether or not the pneumatic tire can be rehabilitated.

本発明の実施形態からなる重荷重用の空気入りタイヤを示す子午線断面図である。1 is a meridian cross-sectional view showing a heavy duty pneumatic tire according to an embodiment of the present invention. 本発明の実施形態からなるタイヤ劣化判定具を示す斜視図である。It is a perspective view which shows the tire degradation determination tool which consists of embodiment of this invention. 本発明に係るタイヤ劣化判定具の変形例を示す斜視図である。It is a perspective view which shows the modification of the tire deterioration determination tool which concerns on this invention. 本発明に係るタイヤ劣化判定具の他の変形例を示す斜視図である。It is a perspective view which shows the other modification of the tire degradation determination tool which concerns on this invention. 本発明に係るタイヤ劣化判定具の更に他の変形例を示す斜視図である。It is a perspective view which shows the other modification of the tire deterioration determination tool which concerns on this invention. 本発明に係るタイヤ更生可否判定方法で使用される判定チャートの一例を示す図である。It is a figure which shows an example of the determination chart used with the tire rehabilitation determination method which concerns on this invention. 試験におけるベルト層の層間剥離力と酸素吸着量との関係を示すグラフである。It is a graph which shows the relationship between the delamination force of a belt layer in a test, and oxygen adsorption amount.

以下、本発明の構成について添付の図面を参照しながら詳細に説明する。図１は本発明の実施形態からなる重荷重用の空気入りタイヤを示し、図２は本発明の実施形態からなるタイヤ劣化判定具を示すものである。   Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a heavy load pneumatic tire according to an embodiment of the present invention, and FIG. 2 shows a tire deterioration determining tool according to an embodiment of the present invention.

図１に示すように、本実施形態の空気入りタイヤは、タイヤ周方向に延在して環状をなすトレッド部１と、該トレッド部１の両側に配置された一対のサイドウォール部２，２と、これらサイドウォール部２のタイヤ径方向内側に配置された一対のビード部３，３とを備えている。   As shown in FIG. 1, the pneumatic tire of the present embodiment includes a tread portion 1 that extends in the tire circumferential direction and has an annular shape, and a pair of sidewall portions 2, 2 disposed on both sides of the tread portion 1. And a pair of bead portions 3 and 3 disposed inside the sidewall portion 2 in the tire radial direction.

一対のビード部３，３間にはカーカス層４が装架されている。このカーカス層４は、タイヤ径方向に延びる複数本の補強コードを含み、各ビード部３に配置されたビードコア５の廻りにタイヤ内側から外側へ折り返されている。ビードコア５の外周上には断面三角形状のゴム組成物からなるビードフィラー６が配置されている。   A carcass layer 4 is mounted between the pair of bead portions 3 and 3. The carcass layer 4 includes a plurality of reinforcing cords extending in the tire radial direction, and is folded from the inside of the tire to the outside around the bead core 5 disposed in each bead portion 3. A bead filler 6 made of a rubber composition having a triangular cross-section is disposed on the outer periphery of the bead core 5.

一方、トレッド部１におけるカーカス層４の外周側には複数層のベルト層７が埋設されている。これらベルト層７はタイヤ周方向に対して傾斜する複数本の補強コードを含み、かつ層間で補強コードが互いに交差するように配置されている。ベルト層７において、補強コードのタイヤ周方向に対する傾斜角度は例えば１０°〜６０°の範囲に設定されている。ベルト層７の補強コードとしては、スチールコードが好ましく使用される。   On the other hand, a plurality of belt layers 7 are embedded on the outer peripheral side of the carcass layer 4 in the tread portion 1. These belt layers 7 include a plurality of reinforcing cords inclined with respect to the tire circumferential direction, and are arranged so that the reinforcing cords cross each other between the layers. In the belt layer 7, the inclination angle of the reinforcing cord with respect to the tire circumferential direction is set in a range of, for example, 10 ° to 60 °. A steel cord is preferably used as the reinforcing cord of the belt layer 7.

上記空気入りタイヤにおいて、タイヤ気室に面するタイヤ内面Ｓにはタイヤ劣化判定具１０が装着されている。図２に示すように、タイヤ劣化判定具１０はシート状であって直方体をなすゴム組成物の成形体１１から構成されている。成形体１１を構成するゴム組成物としては、例えば、硫黄架橋可能なジエン系ゴム組成物を使用することができる。ジエン系ゴムとしては、天然ゴム（ＮＲ）、イソプレンゴム（ＩＲ）、エポキシ化天然ゴム、スチレンブタジエンゴム（ＳＢＲ）、ブタジエンゴム（ＢＲ）、ニトリルゴム（ＮＢＲ）、水素化ＮＢＲ、水素化ＳＢＲ等を挙げることができる。但し、タイヤ劣化判定具１０の成形体１１に使用されるゴムは上記ジエン系ゴムに限定されるものではなく、そのゴムには硫黄、加硫促進剤、老化防止剤、カーボンブラック等の充填剤、オイル等の軟化剤、樹脂、ワックス、コバルト塩等の金属塩、ステアリン酸、亜鉛華等の添加物を適宜配合することができる。特に、タイヤの酸化劣化を判定するにあたって、酸化劣化を生じ易い天然ゴム系のゴム組成物が好ましく、硫黄、更には金属塩を含有するものが好ましい。   In the pneumatic tire, a tire deterioration determination tool 10 is attached to the tire inner surface S facing the tire chamber. As shown in FIG. 2, the tire deterioration determination tool 10 is a sheet-like rubber composition molded body 11 that is a rectangular parallelepiped. As the rubber composition constituting the molded body 11, for example, a sulfur-crosslinkable diene rubber composition can be used. Diene rubbers include natural rubber (NR), isoprene rubber (IR), epoxidized natural rubber, styrene butadiene rubber (SBR), butadiene rubber (BR), nitrile rubber (NBR), hydrogenated NBR, hydrogenated SBR, etc. Can be mentioned. However, the rubber used for the molded body 11 of the tire deterioration determining tool 10 is not limited to the diene rubber, and the rubber may be a filler such as sulfur, a vulcanization accelerator, an anti-aging agent, or carbon black. Additives such as softeners such as oil, metal salts such as resins, waxes and cobalt salts, stearic acid and zinc white can be appropriately blended. In particular, when determining the oxidative deterioration of a tire, a natural rubber-based rubber composition that easily causes oxidative deterioration is preferable, and those containing sulfur and metal salts are preferable.

また、タイヤ劣化判定具１０はシート状の粘着層１２を介してタイヤ内面Ｓに対して着脱自在に貼着されている。このような粘着層１２としては、両面テープや粘着剤等を使用することができる。   The tire deterioration determining tool 10 is detachably attached to the tire inner surface S via a sheet-like adhesive layer 12. As such an adhesive layer 12, a double-sided tape, an adhesive, etc. can be used.

タイヤ劣化判定具１０において、成形体１１の被装着面を除く部分の表面積Ｓ（ｍｍ2）と成形体１１の体積Ｖ（ｍｍ3）との比Ｓ／Ｖは０．１以上、好ましくは０．５〜１０の範囲に設定され、成形体１１の被装着面を除く部分の表面積Ｓは５０ｍｍ2以上、好ましくは５０ｍｍ2〜５０００ｍｍ2の範囲に設定されている。また、成形体１１の体積Ｖは５０ｍｍ3以上、好ましくは１００ｍｍ3〜１５０００ｍｍ3の範囲に設定されている。 In the tire degradation determination tool 10, the ratio S / V between the surface area S (mm 2 ) of the portion excluding the mounting surface of the molded body 11 and the volume V (mm 3 ) of the molded body 11 is 0.1 or more, preferably 0. is set in a range of .5～10, the surface area S of the portion excluding the object mounting surface of the molded body 11 is 50 mm 2 or more, preferably set in a range of 50mm 2 ~5000mm 2. The volume V of the body 11 is 50 mm 3 or more, preferably set in a range of 100mm 3 ~15000mm 3.

このように構成されるタイヤ劣化判定具１０によれば、成形体１１の被装着面を除く部分の表面積Ｓを大きくすることで酸素劣化の影響を顕在化させることができ、しかも成形体１１の被装着面を除く部分の表面積Ｓに対して成形体１１の体積Ｖを相対的に小さくすることで酸化劣化の影響を顕在化させることができる。これにより、タイヤ劣化判定具１０の劣化度合いの感度を高めることができる。そのため、タイヤ劣化判定具１０をタイヤ内面Ｓに装着し、タイヤ使用開始後の任意の時期にタイヤ劣化判定具１０を取り外し、劣化が進行したタイヤ劣化判定具１０を分析することにより、空気入りタイヤの劣化度合いを詳細に判定することができる。   According to the tire deterioration determining tool 10 configured in this way, the influence of oxygen deterioration can be made obvious by increasing the surface area S of the portion excluding the mounted surface of the formed body 11. By making the volume V of the molded body 11 relatively small with respect to the surface area S of the portion excluding the mounting surface, the influence of oxidative degradation can be made obvious. Thereby, the sensitivity of the deterioration degree of the tire deterioration determination tool 10 can be increased. Therefore, by attaching the tire deterioration determining tool 10 to the tire inner surface S, removing the tire deterioration determining tool 10 at an arbitrary time after starting use of the tire, and analyzing the tire deterioration determining tool 10 in which deterioration has progressed, a pneumatic tire is obtained. It is possible to determine the degree of deterioration in detail.

ここで、成形体１１の表面積Ｓと体積Ｖとの比Ｓ／Ｖが０．１よりも小さいと表面積Ｓが相対的に小さくなり体積Ｖが相対的に大きくなるため劣化度合いの感度が低くなる。同様に、成形体１１の表面積Ｓが５０ｍｍ2よりも小さいと劣化度合いの感度が低くなる。また、成形体１１の表面積Ｓと体積Ｖとの比Ｓ／Ｖが１０よりも大きいと体積Ｖが相対的に小さくなり、タイヤ劣化判定具１０が全体的に劣化するまでの時間が短くなるため劣化度合いを調べるための器具として有効に機能しなくなる。 Here, if the ratio S / V between the surface area S and the volume V of the molded body 11 is smaller than 0.1, the surface area S becomes relatively small and the volume V becomes relatively large, so the sensitivity of the degree of deterioration becomes low. . Similarly, when the surface area S of the molded body 11 is smaller than 50 mm 2 , the sensitivity of the degree of deterioration becomes low. Further, if the ratio S / V between the surface area S and the volume V of the molded body 11 is larger than 10, the volume V becomes relatively small, and the time until the tire deterioration determining tool 10 is deteriorated as a whole is shortened. It will not function effectively as an instrument for checking the degree of deterioration.

タイヤ劣化判定具１０を構成する成形体１１の形状は特に限定されるものではなく、半球形状や三角柱形状等の種々の形状とすることが可能である。しかしながら、成形体１１はシート状をなし、その最大厚さｔが０．５ｍｍ〜５．０ｍｍであると良い。これにより、成形体１１の厚さ方向における劣化進行の不均一性を小さくし、劣化度合いの判定精度を高めることができる。成形体１１の最大厚さｔが０．５ｍｍよりも小さいとタイヤ劣化判定具１０が全体的に劣化するまでの時間が短くなるため劣化度合いを調べるための器具として有効に機能しなくなり、逆に５．０ｍｍよりも大きいと劣化度合いの感度が低くなると共に、歪による発熱が大きくなり、その発熱による物性劣化がタイヤ劣化度との相関を阻害することになる。   The shape of the molded body 11 constituting the tire deterioration determining tool 10 is not particularly limited, and can be various shapes such as a hemispherical shape and a triangular prism shape. However, it is preferable that the molded body 11 has a sheet shape and the maximum thickness t is 0.5 mm to 5.0 mm. Thereby, the nonuniformity of the progress of deterioration in the thickness direction of the molded body 11 can be reduced, and the determination accuracy of the degree of deterioration can be increased. If the maximum thickness t of the molded body 11 is smaller than 0.5 mm, the time until the tire deterioration determination tool 10 is deteriorated as a whole is shortened, so that it does not function effectively as an instrument for examining the deterioration degree. If it is larger than 5.0 mm, the sensitivity of the degree of deterioration becomes low, and heat generation due to strain increases, and physical property deterioration due to the heat generation inhibits the correlation with the tire deterioration degree.

図３〜図５はそれぞれ本発明に係るタイヤ劣化判定具の変形例を示すものである。図３においては、成形体１１の被装着面とは反対側の面にジグザグ形状を有する凹凸部１１ａが形成されている。図４においては、成形体１１の被装着面とは反対側の面に波形状を有する凹凸部１１ｂが形成されている。図５においては、成形体１１の被装着面とは反対側の面に複数のディンプル１１ｃが形成されている。このように成形体１１が凹凸に起伏した表面形状を有することにより、成形体１１の表面積Ｓを増大させて劣化度合いの感度を更に高めることができる。   3 to 5 show modifications of the tire deterioration determining tool according to the present invention. In FIG. 3, a concavo-convex portion 11 a having a zigzag shape is formed on the surface opposite to the mounting surface of the molded body 11. In FIG. 4, an uneven portion 11 b having a wave shape is formed on the surface of the molded body 11 opposite to the mounted surface. In FIG. 5, a plurality of dimples 11 c are formed on the surface of the molded body 11 opposite to the mounted surface. Thus, since the molded object 11 has the surface shape which was uneven | corrugated, the surface area S of the molded object 11 can be increased, and the sensitivity of a deterioration degree can further be raised.

上記空気入りタイヤにおいて、タイヤ劣化判定具１０はトレッド幅ＴＷの中央側７５％に相当する領域Ｘ１又はタイヤ断面高さＳＨの２５％以下となる領域Ｘ２の範囲内でタイヤ内面Ｓに装着されているのが良い。これら領域Ｘ１，Ｘ２ではタイヤ走行時にタイヤ内面Ｓが変形し難いため、タイヤ劣化判定具１０に掛かる歪を低減し、酸素による劣化度合いを精度良く判定することができる。タイヤ劣化判定具１０の配置位置が領域Ｘ１，Ｘ２から外れると、走行時にタイヤ劣化判定具１０に対して歪が繰り返し与えられることに起因してタイヤ劣化判定具１０に物性変化が起こり、劣化度合いを正確に判断することが困難になる。   In the pneumatic tire, the tire deterioration determination tool 10 is mounted on the tire inner surface S within a range of an area X1 corresponding to 75% of the center side of the tread width TW or an area X2 of 25% or less of the tire cross-section height SH. It is good to be. In these regions X1 and X2, since the tire inner surface S is not easily deformed when the tire is running, the strain applied to the tire deterioration determining tool 10 can be reduced, and the degree of deterioration due to oxygen can be accurately determined. When the arrangement position of the tire deterioration determination tool 10 deviates from the regions X1 and X2, the physical property change occurs in the tire deterioration determination tool 10 due to repeated distortion applied to the tire deterioration determination tool 10 during traveling, and the degree of deterioration It becomes difficult to accurately determine

また、上記空気入りタイヤにおいて、タイヤ劣化判定具１０をタイヤ内面Ｓに対して粘着層１２を介して貼着した場合、タイヤ劣化判定具１０を容易に剥がすことができる。そのため、引き剥がし時に無理な力が負荷されていないタイヤ劣化判定具１０を用いて劣化度合いを精度良く判定することができる。   Moreover, in the said pneumatic tire, when the tire deterioration determination tool 10 is stuck on the tire inner surface S via the adhesive layer 12, the tire deterioration determination tool 10 can be easily peeled off. Therefore, it is possible to accurately determine the degree of deterioration using the tire deterioration determination tool 10 that is not loaded with an excessive force during peeling.

以下、上述したタイヤ劣化判定具１０を用いたタイヤ劣化判定方法について詳細に説明する。先ず、空気入りタイヤにおいて、タイヤ内面Ｓに対してタイヤ劣化判定具１０を装着する。タイヤ劣化判定具１０は空気入りタイヤの製造直後に装着しても良く、或いは、空気入りタイヤの使用開始時に装着しても良い。タイヤ劣化判定具１０は新品時の物理的特性が予め把握されたものである。次いで、タイヤ内面Ｓに装着されたタイヤ劣化判定具１０をタイヤ使用開始後の任意の時点で取り外す。例えば、タイヤ使用過程において任意の走行距離に到達した時点、更生作業を行う時点又はタイヤを廃棄する時点においてタイヤ内面Ｓからタイヤ劣化判定具１０を取り外す。そして、取り外されたタイヤ劣化判定具１０の物理的特性を測定し、その測定値を用いて物理的特性の新品時からの変化量を求め、その変化量に基づいて空気入りタイヤの劣化度合いを判定する。   Hereinafter, the tire deterioration determination method using the tire deterioration determination tool 10 described above will be described in detail. First, in the pneumatic tire, the tire deterioration determination tool 10 is attached to the tire inner surface S. The tire deterioration determining tool 10 may be mounted immediately after manufacturing the pneumatic tire, or may be mounted at the start of use of the pneumatic tire. The tire deterioration determining tool 10 is obtained by grasping the physical characteristics of a new article in advance. Next, the tire deterioration determination tool 10 mounted on the tire inner surface S is removed at an arbitrary time after the start of tire use. For example, the tire deterioration determination tool 10 is removed from the tire inner surface S when an arbitrary travel distance is reached in the tire use process, when rehabilitation work is performed, or when the tire is discarded. Then, the physical characteristics of the removed tire deterioration determination tool 10 are measured, and the measured value is used to determine the amount of change of the physical characteristics from when new, and the degree of deterioration of the pneumatic tire is determined based on the amount of change. judge.

物理的特性としては、重量（比重）、酸素吸着量、電気抵抗、硬度、破断特性、粘弾特性等を挙げることができる。タイヤ劣化判定具１０が酸化により劣化すると、重量（比重）、酸素吸着量、電気抵抗、硬度、破断特性、粘弾特性が劣化に伴って変化するので、その物理的特性の新品時からの変化量に基づいて空気入りタイヤの劣化度合いを精度良く判定することができる。また、タイヤ劣化判定具１０を化学的に分析し、その分析結果を劣化度合いの指標とすることも可能である。   Examples of physical characteristics include weight (specific gravity), oxygen adsorption amount, electrical resistance, hardness, fracture characteristics, viscoelastic characteristics, and the like. When the tire deterioration determining tool 10 deteriorates due to oxidation, the weight (specific gravity), oxygen adsorption amount, electrical resistance, hardness, rupture characteristics, and viscoelastic characteristics change with deterioration. The degree of deterioration of the pneumatic tire can be accurately determined based on the amount. It is also possible to chemically analyze the tire deterioration determination tool 10 and use the analysis result as an indicator of the degree of deterioration.

以下、上述したタイヤ劣化判定具１０を用いたタイヤ更生可否判定方法について詳細に説明する。空気入りタイヤを更生する場合、その空気入りタイヤが台タイヤとして再利用可能であるか否かを判定する必要があるが、そのような判定をタイヤ劣化判定具１０により行うことができる。   Hereinafter, a tire rehabilitation determination method using the above-described tire deterioration determination tool 10 will be described in detail. When rehabilitating a pneumatic tire, it is necessary to determine whether or not the pneumatic tire can be reused as a base tire. Such a determination can be made by the tire deterioration determination tool 10.

タイヤ更生可否の判定に先駆けて、空気入りタイヤの内部パーツの残存耐久性と空気入りタイヤの内面に装着されたタイヤ劣化判定具１０の物理的特性の新品時からの変化量とを関連付けた判定チャートを用意する。図６は、縦軸に内部パーツの残存耐久性を示し、横軸に物理的特性の新品時からの変化量を示した判定チャートである。内部パーツの残存耐久性としては、特に限定されるものではないが、ベルト層の層間剥離力やビードフィラーゴムの破断伸び等を指標とすることができる。   Prior to the determination of whether or not the tire can be rehabilitated, the determination is made by associating the remaining durability of the internal parts of the pneumatic tire with the amount of change of the physical characteristics of the tire deterioration determination tool 10 mounted on the inner surface of the pneumatic tire from the new time. Prepare a chart. FIG. 6 is a determination chart in which the vertical axis indicates the remaining durability of the internal parts, and the horizontal axis indicates the amount of change in physical characteristics from when new. The remaining durability of the internal parts is not particularly limited, but the delamination force of the belt layer, the elongation at break of the bead filler rubber, or the like can be used as an index.

図６に示すように、物理的特性の新品時からの変化量が大きくなるに連れて内部パーツの残存耐久性が徐々に低下する。例えば、物理的特性として硬度を採用する場合、劣化によりタイヤ劣化判定具１０は徐々に硬くなって硬度の変化量が増大するが、それに伴って内部パーツの残存耐久性が徐々に低下する。このような判定チャートは共通の構造を有する多数本の空気入りタイヤから採取された残存耐久性と物理的特性に関するデータに基づいて作成することができるが、場合によっては、シミュレーションに基づいて作成することも可能である。そして、図６の判定チャートにおいて、所定の残存耐久性Ａ（例えば、台タイヤとして再利用可能と判断される最低限の残存耐久性）に対応する物理的特性の新品時からの変化量の閾値Ｂを決定する。   As shown in FIG. 6, the remaining durability of the internal parts gradually decreases as the amount of change in physical properties from when new is increased. For example, when the hardness is adopted as the physical characteristic, the tire deterioration determination tool 10 is gradually hardened due to the deterioration and the amount of change in the hardness is increased, but the remaining durability of the internal parts is gradually decreased accordingly. Such a determination chart can be created based on data regarding residual durability and physical characteristics collected from a large number of pneumatic tires having a common structure, but in some cases, it is created based on simulation. It is also possible. In the determination chart of FIG. 6, the threshold value of the amount of change from a new physical property corresponding to a predetermined remaining durability A (for example, the minimum remaining durability determined to be reusable as a base tire). B is determined.

タイヤ更生可否を判定する場合、タイヤ内面Ｓに装着されたタイヤ劣化判定具１０をタイヤ更生時に取り外し、その取り外されたタイヤ劣化判定具１０の物理的特性を測定し、その測定値を用いて物理的特性の新品時からの変化量を求め、該変化量の実測値と閾値Ｂと対比する。例えば、物理的特性の新品時からの変化量が閾値Ｂよりも大きい場合、その空気入りタイヤは基準となる残存耐久性Ａを有していないことを意味するので、台タイヤとして不適当であると判断される。一方、物理的特性の新品時からの変化量が閾値Ｂよりも小さい場合、その空気入りタイヤは基準となる残存耐久性Ａを有していることを意味するので、台タイヤとして適当であると判断される。このように物理的特性の新品時からの変化量の実測値と閾値Ｂと対比することにより、空気入りタイヤが更生可能であるか否かを精度良く判定することができる。なお、所定の残存耐久性Ａは必ずしも台タイヤとして再利用可能と判断される最低限の残存耐久性である必要はなく、安全率を考慮して任意のレベルに設定することが可能である。   When determining whether tire regeneration is possible, the tire deterioration determination tool 10 attached to the tire inner surface S is removed during tire regeneration, the physical characteristics of the removed tire deterioration determination tool 10 are measured, and the measured values are used to physically The amount of change of the target characteristic from when it is new is obtained, and the measured value of the amount of change is compared with the threshold value B. For example, if the amount of change in physical properties from when new is greater than the threshold value B, it means that the pneumatic tire does not have a reference residual durability A, which is inappropriate as a base tire. It is judged. On the other hand, if the amount of change in physical properties from when new is smaller than the threshold value B, it means that the pneumatic tire has a reference residual durability A, and is therefore suitable as a base tire. To be judged. In this way, by comparing the measured value of the change amount of the physical characteristics from when it is new and the threshold value B, it can be accurately determined whether the pneumatic tire can be rehabilitated. The predetermined remaining durability A is not necessarily the minimum remaining durability that is determined to be reusable as a base tire, and can be set to an arbitrary level in consideration of the safety factor.

表１のように寸法が異なる実施例１〜９及び比較例１〜２のタイヤ劣化判定具を用意し、これらタイヤ劣化判定具をそれぞれタイヤサイズ１１Ｒ２２．５の空気入りタイヤの内面に装着した。実施例１〜９のタイヤ劣化判定具は、図２〜図５のいずれかの形状を有するゴム組成物の成形体を有し、該成形体の被装着面を除く部分の表面積Ｓ（ｍｍ2）と該成形体の体積Ｖ（ｍｍ3）を種々異ならせたものである。タイヤ劣化判定具はタイヤ赤道位置においてタイヤ内面に対して粘着層を介して貼着した。 As shown in Table 1, tire deterioration determination tools of Examples 1 to 9 and Comparative Examples 1 and 2 having different dimensions were prepared, and these tire deterioration determination tools were respectively attached to the inner surfaces of pneumatic tires having a tire size of 11R22.5. The tire deterioration determination tools of Examples 1 to 9 have a molded body of a rubber composition having any of the shapes in FIGS. 2 to 5, and the surface area S (mm 2 ) of the portion excluding the mounted surface of the molded body. ) And the volume V (mm 3 ) of the molded body are different. The tire deterioration determination tool was attached to the tire inner surface via an adhesive layer at the tire equator position.

Figure 2017128255
Figure 2017128255

ここで、タイヤ劣化判定具を備えていない複数本の空気入りタイヤ（基準例）を同一条件下で実際に使用し、新品時から更生時までの期間において空気入りタイヤを適時解体し、ベルト層の層間剥離力（Ｎ／ｍｍ）とベルト層のコートゴムの酸素吸着量の変化量（ｐｈｒ）を測定した。これにより得られたベルト層の層間剥離力とベルト層のコートゴムの酸素吸着量の変化量とをグラフ上にプロットして図７のような相関曲線（太線）を得た。   Here, a plurality of pneumatic tires (reference examples) that are not equipped with a tire deterioration judging tool are actually used under the same conditions, and the pneumatic tires are dismantled in a timely manner during the period from new to rehabilitation, and belt layers The peel strength (N / mm) of the belt and the amount of change (phr) in the oxygen adsorption amount of the coat rubber of the belt layer were measured. The resulting delamination force of the belt layer and the amount of change in the oxygen adsorption amount of the coat rubber of the belt layer were plotted on a graph to obtain a correlation curve (thick line) as shown in FIG.

次に、実施例１〜９及び比較例１〜２のタイヤ劣化判定具を備えた空気入りタイヤについて、基準例と同様の方法により、新品時から更生時までの期間においてベルト層の層間剥離力とタイヤ劣化判定具の酸素吸着量の変化量を測定した。これにより得られたベルト層の層間剥離力（Ｎ／ｍｍ）とタイヤ劣化判定具の酸素吸着量の変化量（ｐｈｒ）との相関曲線（細線）を図７に併せて示した。   Next, with respect to the pneumatic tires provided with the tire deterioration determination tools of Examples 1 to 9 and Comparative Examples 1 and 2, the delamination force of the belt layer in the period from the new article to the rehabilitation period by the same method as the reference example. And the amount of change in the amount of oxygen adsorbed by the tire deterioration determination tool. FIG. 7 also shows a correlation curve (thin line) between the delamination force (N / mm) of the belt layer thus obtained and the amount of change (phr) in the oxygen adsorption amount of the tire deterioration determination tool.

その結果、図７に示すように、実施例１〜９のタイヤ劣化判定具を用いた場合、ベルト層の層間剥離力（内部パーツの残存耐久性に相当）とタイヤ劣化判定具の酸素吸着量（物理的特性）の変化量との相関性が、基準例におけるベルト層の層間剥離力とベルト層のコートゴムの酸素吸着量の変化量との相関性と近似するものであった。特に、基準例におけるタイヤ更生時の酸素吸着量の変化量に対する誤差が±０．５ｐｈｒ以内となる範囲をＲとしたとき、実施例１〜９におけるタイヤ更生時の酸素吸着量の変化量はいずれも範囲Ｒに包含されるものであった。一方、比較例１〜２のタイヤ劣化判定具を用いた場合、ベルト層の層間剥離力とタイヤ劣化判定具の酸素吸着量の変化量との相関性が基準例から大きく異なっていた。このことからも明らかなように、実施例１〜９のタイヤ劣化判定具によれば、空気入りタイヤの劣化度合いを精度良く判定することができ、その空気入りタイヤが更生可能であるか否かを精度良く判定することができる。   As a result, as shown in FIG. 7, when the tire deterioration determination tool of Examples 1 to 9 is used, the delamination force of the belt layer (corresponding to the remaining durability of the internal parts) and the oxygen adsorption amount of the tire deterioration determination tool The correlation with the change amount of (physical characteristics) approximated the correlation between the delamination force of the belt layer and the change amount of the oxygen adsorption amount of the coat rubber of the belt layer in the reference example. In particular, when the range in which the error with respect to the amount of change in oxygen adsorption during tire regeneration in the reference example is within ± 0.5 phr is R, the amount of change in oxygen adsorption during tire regeneration in Examples 1 to 9 Was also included in range R. On the other hand, when the tire deterioration determination tool of Comparative Examples 1 and 2 was used, the correlation between the delamination force of the belt layer and the amount of change in the oxygen adsorption amount of the tire deterioration determination tool was significantly different from the reference example. As is clear from this, according to the tire deterioration determination tools of Examples 1 to 9, it is possible to accurately determine the degree of deterioration of the pneumatic tire, and whether or not the pneumatic tire can be rehabilitated. Can be determined with high accuracy.

１ トレッド部
２ サイドウォール部
３ ビード部
４ カーカス層
５ ビードコア
６ ビードフィラー
７ ベルト層
１０ タイヤ劣化判定具
１１ 成形体
１２ 粘着層 DESCRIPTION OF SYMBOLS 1 Tread part 2 Side wall part 3 Bead part 4 Carcass layer 5 Bead core 6 Bead filler 7 Belt layer 10 Tire deterioration determination tool 11 Molded object 12 Adhesive layer

Claims (8)

ゴム組成物の成形体からなるタイヤ劣化判定具であって、前記成形体の被装着面を除く部分の表面積Ｓ（ｍｍ2）と前記成形体の体積Ｖ（ｍｍ3）との比Ｓ／Ｖが０．１以上であり、前記成形体の被装着面を除く部分の表面積Ｓが５０ｍｍ2以上であることを特徴とするタイヤ劣化判定具。 A tire deterioration determination tool comprising a molded article of a rubber composition, wherein a ratio S / V between a surface area S (mm 2 ) of a portion excluding a mounting surface of the molded article and a volume V (mm 3 ) of the molded article Is a tire deterioration determining tool, wherein the surface area S of the portion excluding the mounting surface of the molded body is 50 mm 2 or more. 前記成形体が凹凸に起伏した表面形状を有することを特徴とする請求項１に記載のタイヤ劣化判定具。   The tire deterioration determining tool according to claim 1, wherein the molded body has a surface shape undulating. 前記成形体がシート状をなし、その最大厚さが０．５ｍｍ〜５．０ｍｍであることを特徴とする請求項１又は２に記載のタイヤ劣化判定具。   The tire degradation determination tool according to claim 1 or 2, wherein the molded body has a sheet shape and a maximum thickness of 0.5 mm to 5.0 mm. 請求項１〜３のいずれかに記載のタイヤ劣化判定具がタイヤ内面に装着されていることを特徴とする空気入りタイヤ。   A pneumatic tire, wherein the tire deterioration determination tool according to any one of claims 1 to 3 is mounted on an inner surface of the tire. 前記タイヤ劣化判定具がトレッド幅の中央側７５％の領域又はタイヤ断面高さの２５％以下の領域においてタイヤ内面に装着されていることを特徴とする請求項４に記載の空気入りタイヤ。   5. The pneumatic tire according to claim 4, wherein the tire deterioration determination tool is attached to the tire inner surface in a region of 75% of the center side of the tread width or a region of 25% or less of the tire cross-section height. 前記タイヤ劣化判定具がタイヤ内面に対して粘着層を介して貼着されていることを特徴とする請求項４又は５に記載の空気入りタイヤ。   The pneumatic tire according to claim 4 or 5, wherein the tire deterioration determination tool is attached to an inner surface of the tire via an adhesive layer. 請求項１〜３のいずれかに記載のタイヤ劣化判定具を用いたタイヤ劣化判定方法であって、空気入りタイヤの内面に装着されたタイヤ劣化判定具をタイヤ使用開始後の任意の時点で取り外し、その取り外されたタイヤ劣化判定具の物理的特性を測定し、その測定値を用いて前記物理的特性の新品時からの変化量を求め、該変化量に基づいて前記空気入りタイヤの劣化度合いを判定することを特徴とするタイヤ劣化判定方法。   A tire deterioration determination method using the tire deterioration determination tool according to any one of claims 1 to 3, wherein the tire deterioration determination tool mounted on the inner surface of the pneumatic tire is removed at any time after the start of tire use. , Measuring the physical characteristics of the removed tire deterioration determination tool, using the measured value to determine the amount of change of the physical characteristics from the new time, and based on the amount of change, the degree of deterioration of the pneumatic tire A tire deterioration determining method characterized by determining the tire. 請求項１〜３のいずれかに記載のタイヤ劣化判定具を用いたタイヤ更生可否判定方法であって、空気入りタイヤの内部パーツの残存耐久性と前記空気入りタイヤの内面に装着されたタイヤ劣化判定具の物理的特性の新品時からの変化量とを関連付けた判定チャートを用意し、該判定チャートにおいて所定の残存耐久性に対応する前記物理的特性の新品時からの変化量の閾値を決定する一方で、前記空気入りタイヤの内面に装着されたタイヤ劣化判定具をタイヤ更生時に取り外し、その取り外されたタイヤ劣化判定具の物理的特性を測定し、その測定値を用いて前記物理的特性の新品時からの変化量を求め、該変化量の実測値を前記閾値と対比することにより、前記空気入りタイヤが更生可能であるか否かを判定することを特徴とするタイヤ更生可否判定方法。   A tire rehabilitation determination method using the tire deterioration determination tool according to any one of claims 1 to 3, wherein the remaining durability of the internal parts of the pneumatic tire and the tire deterioration attached to the inner surface of the pneumatic tire Prepare a determination chart that correlates the change amount of the physical property of the determination tool from the new time, and determine a threshold value of the change amount of the physical property from the new time corresponding to the predetermined remaining durability in the determination chart On the other hand, the tire deterioration determining tool mounted on the inner surface of the pneumatic tire is removed during tire regeneration, the physical characteristics of the removed tire deterioration determining tool are measured, and the physical characteristics are measured using the measured values. Determining whether or not the pneumatic tire can be rehabilitated by obtaining a change amount of the tire from when it is new and comparing the measured value of the change amount with the threshold value. Determination method.
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