GB/T 16586-2014Rubber, vulcanized -- Determination of adhesion to wire cord (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 16586-1996, Rubber, vulcanized - Determination of

adhesion to wire cord; compared with GB/T 16586-1996, the major technical changes

of this Standard are as follows:

— In 7.3.4, CHANGE "Warm up the mould so that the rubber temperature is about

100 °C and the rubber is ready to flow. Apply a force of at least 100 kN and

maintain for the duration of the vulcanization" TO "During the entire vulcanization

process, the pressure applied by the flat vulcanizer on the mold cavity area shall

not be less than 3.5 MPa." (6.3.4 of the 1996 edition; 7.3.4 of this edition)

— Add the normative appendix A "Calibration schedule".

This Standard uses the redrafting method to modify and adopt ISO 5603:2011, Rubber,

vulcanized - Determination of adhesion to wire cord.

The technical differences between this Standard and ISO 5603:2011 and the reasons are

as follows:

— In 5.2, to be consistent with the provisions in GB/T 6038, CHANGE "Vulcanizing

press, large enough to take the mould. It shall conform to the requirements of GB/T

6038 and shall be capable of applying a force of at least 100 kN." TO "Vulcanizing

press shall conform to the requirements of GB/T 6038."

— In 7.3.2.2, according to the actual test procedure, CHANGE "If required, preheat

the mould, including all component parts, to about 100 °C." TO "The mold must

be preheated at the test temperature for at least 20 minutes."

— In 7.3.4, to be consistent with the provisions in GB/T 6038, DELETE "Allow the

mould to warm up so that the rubber temperature is about 100 °C and the rubber is

ready to flow." and CHANGE "Apply a force of at least 100 kN and maintain for

the duration of the vulcanization." TO "During the entire vulcanization process, the

pressure applied by the flat vulcanizer on the mold cavity area shall not be less than

1 Scope

This Standard specifies two methods for determining the adhesion strength of

vulcanized rubber to wire cord which is embedded in the rubber: method 1 and method

2.

The two methods do not necessarily give the same results.

They are applicable primarily to test pieces prepared in the laboratory under standard

conditions and used for the development and control of materials and processes utilized

in the manufacture of products reinforced with wire cord.

Note: This Standard can also be used for single wire, for example bead wire. Method

1 reduces the dependence of the measured adhesion on the modulus and strength

properties of the rubber.

2 Normative references

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

GB/T 2941, Rubber - General procedures for preparing and conditioning test

pieces for physical test methods (GB/T 2941-2006, ISO 23529:2004, IDT)

GB/T 6038, Rubber test mixes - Preparation, mixing and vulcanization -

Equipment and procedures (GB/T 6038-2006, ISO 2393:1994, MOD)

GB/T 17200-2008, Technical specification for tensile compression and flexural

testing machines for rubber and plastics (constant rate of traverse) (ISO

5893:2002, IDT)

GB/T 25269-2010, Rubber - Guide to the calibration of test equipment (ISO

18899:2004, IDT)

3 Principle

The adhesion strength is determined by measuring the force required to pull out a single

cord from the surrounding rubber of a prepared test piece. The force is directed along

the axis of the cord, using a test jig containing a suitably chosen circular- or square-

shaped hole to ensure uniformity of stress.

The test piece preparation procedure follows that of method 1, except that the mould

spacers and the reinforcement strips are omitted, and that test piece construction prior

to vulcanization is carried out on a special building rack similar to the mould (see Figure

4).

The unvulcanized formed test pieces shall be carefully removed from the building rack

by pressing uniformly from the rear, placed in a desiccated container and stored at

standard laboratory temperature (see GB/T 2941) until vulcanization. Test pieces shall

be vulcanized within a maximum of 12 h.

8 Procedure

Tests shall be performed at standard laboratory temperature (see GB/T 2941) unless

otherwise specified.

Mount the test piece in the tensile-testing machine using the relevant fixture shown in

Figure 6. Carefully adjust the test piece so that the first wire cord is central in the hole,

thus ensuring that the test tension will be uniformly distributed round the circumference

of the cord (see Figures 6 and 8). This centring is facilitated by the use of the aligning

features already mentioned in 5.1.1 and 5.4. Clamp the cord to be tested in the extraction

jaws.

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