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GB/T 7036.2-2017 English PDF (GBT7036.2-2017)

GB/T 7036.2-2017 English PDF (GBT7036.2-2017)

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GB/T 7036.2-2017: Inner tube of pneumatic tyres -- Part 2: Inner tube of motorcycle tyres

This Part of GB/T 7036 specifies the types, requirements, test methods, sampling inspection rules and marks for the inner tube of motorcycle tyres. This Part is also applicable to the inner tubes of new motorcycle tyres.
GB/T 7036.2-2017
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 83.160.10
G 41
Replacing GB/T 7036.2-2007
Inner Tube of Pneumatic Tyres -
Part 2: Inner Tube of Motorcycle Tyres
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: NOVEMBER 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Type of Inner Tube ... 5
4 Requirements ... 5
5 Test Method ... 6
6 Sampling and Inspection Rules ... 10
7 Marking ... 11
Foreword
GB/T 7036 Inner Tube of Pneumatic Tyres consists of the following two parts: --- Part 1: Inner Tube of Motor Vehicle Tyres;
--- Part 2: Inner Tube of Motorcycle Tyres.
This Part belongs to Part 2 of GB/T 7036.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part replaced GB/T 7036.2-2007 Inner Tube of Pneumatic Tyres ?€? Part 2: Inner Tube of Motorcycle Tyres. Compared with GB/T 7036.2-2007, this Part has the major technical changes as follows:
--- Add ?€?the size of the inner tube shall meet the matching requirements of the used tyre. When the same inner tube can be applied to different tyres, the
specifications of the tyres that can be matched shall be represented on the inner tube?€? (see 4.1 of this Edition);
--- Modify and confirm the size of the rubber base for the small rubber base valve (see Table 1 of this Edition; Table 1 of Edition 2007);
--- Modify the expression of the aeration measurement position in the air tightness test method (see 5.1.1 of this Edition; 5.1.1 of Edition 2007);
--- Modify ?€??€? and immerse into water for 1min; if there is more than 1 bubble?€??€? into ?€??€? and immerse into water for 1min; if there are 1 or more bubbles?€??€? (see 5.1.3 of this Edition; 5.1.3 of Edition 2007);
--- Modify ?€?rubber base for rubber base valve and tyre body?€??€? into ?€?rubber base valve and tyre body?€??€? (see Table 1 and 5.5 in this Edition; Table 1 and 5.5 of Edition 2007);
--- Add the methods for the values of tensile strength and elongation (see 5.2 of this Edition);
--- Modify ?€?cut a 20mm~30mm-sized mouth at the joint BETWEEN the rubber base AND the rubber of tyre body OF the sample?€??€? into ?€?cut a 10mm~15mm-sized mouth at the joint BETWEEN the rubber base AND the rubber of tyre body OF the sample?€??€?; add a sampling diagram of the bond strength test between the rubber base valve and the tyre body (see 5.5.1 of this Edition; 5.5.1 of Edition 2007);
--- Add the sampling and inspection rules (see Clause 6 of this Edition); Inner Tube of Pneumatic Tyres -
Part 2: Inner Tube of Motorcycle Tyres
1 Scope
This Part of GB/T 7036 specifies the types, requirements, test methods, sampling inspection rules and marks for the inner tube of motorcycle tyres.
This Part is also applicable to the inner tubes of new motorcycle tyres. 2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.
GB/T 528 Rubber, Vulcanized or Thermoplastic - Determination of Tensile Stress- Strain Properties
GB/T 532 Rubber, Vulcanized or Thermoplastic - Determination of Adhesion to Textile Fabric
GB/T 1796.2 Tyre Valves - Part 2: Rubber Base Valves
3 Type of Inner Tube
According to the materials used in the manufacture of the inner tube, it can be divided into two types: Type-A inner tube made of natural rubber and natural rubber blend, Type-B inner tube made of butyl rubber and butyl rubber blend.
4 Requirements
4.1 Specification and size
The size of the inner tube shall meet the matching requirements of the used tyre. When the same inner tube can be applied to different tyres, the specifications of the tyres 5.1.2 Check whether there is air leakage; if there is no air leakage, it is qualified. 5.1.3 If there is air leakage phenomenon, re-inflate according to the same conditions mentioned above; immerse into water for 1min; if 1 or more bubbles emerge, it shall be disqualified. If there is air leakage at the vale core, replace the valve core; then re- test according to the above conditions.
5.2 Tensile test
The tensile test shall be carried out as per GB/T 528. When using Type-1 cutter to measure the tensile strength and elongation, separately take 1 specimen along the circumferential direction of the tyre body (see Figure 1) from the crown center, base center, upper mold center and lower mold center of the same section on the non-joint of the inner tube. When measuring the elongation, the tensile strength shall be measured at the same time; which shall be taken as the tensile strength before the aging test.
The test results of the tensile strength are calculated as per Formula (1) by removing the maximum value S1 and minimum value S4:
Where:
TB ?€? tensile strength; in MPa;
S1, S2, S3, S4 ?€? measured values of the specimen (S1>S2>S3>S4); in MPa. The test result of elongation shall be calculated as per Formula (2) by removing the maximum value S5 and minimum value S8:
Where:
Eb ?€? elongation, expressed in %;
S5, S6, S7, S8 ?€? measured values of the specimen (S5>S6>S7>S8); in %.
specimens as per Formula (4); and obtain its average value:
Where:
PS ?€? thermal tensile deformation rate;
L0 ?€? mark line interval before test; in mm;
L1 ?€? mark line interval after test; in mm;
5.5 The bond strength and bond force between rubber base valve and tyre body 5.5.1 Bond strength between rubber base valve and tyre body
Cut the sample of valve rubber base from the inner tube; separately make 1 specimen with width of 10.0mm??0.5mm symmetrically on both sides of the rubber base (as shown in Figure 2); cut a 10mm~15mm mouth between the specimen rubber base and the tyre body rubber; separately clamp the rubber base and the tyre into the upper and lower clampers; perform test as per GB/T 532; take the average value of the results obtained from the 2 specimens. If the rubber layer is torn off during the peeling period, then the bond strength at that time is greater than the tensile strength of the rubber; and is considered qualified; when indicating the result, it shall be explained. Figure 2 ?€? Specimen Selection
5.5.2 Bond force between rubber base valve and tyre body
On both sides of the inner tube valve, cut the sample at the distance of 10mm from the circumferential direction of the tyre body to the valve rubber base, meanwhile, 100mm from the other end to the rubber base. Use the clamper of the tensile tester to clamp the specimen valve; the other clamper to clamp the long end of the specimen tyre body; perform the bond force test at the tensile speed of 500mm/min??25mm/min; if the valve body and the rubber base are pulled apart or the tyre body is torn off, or the bonding Sampling position for bond strength test of the rubber base and tyre body Valve

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