This standard specifies the method for determining the bonding strength between the inner rubber layer and the reinforcement layer, the outer rubber layer and the reinforcement layer, and between the reinforcement layers. This standard applies to hoses of all inner diameters and the following types of hose structures: woven hoses; yarn woven hoses; yarn wound hoses; yarn knitted hoses; yarn round woven hoses; cord hoses; steel wire braided hoses; steel wire wound hoses; supported spiral hoses. GB/T 14905-1994 Determination of bonding strength between layers of rubber and plastic hoses GB/T14905-1994 Standard download decompression password: www.bzxz.net

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National Standard of the People's Republic of China
Rubber and plastics hose-Determination of adhesion between components This standard is equivalent to the international standard IS08033-1991 Rubber or plastic hose-1 Subject content and applicable specifications
GE/T 14905-94
Determination of adhesion between components
This standard specifies the determination method of the adhesion between the inner rubber layer and the reinforcement layer, the outer rubber layer and the reinforcement layer, and the reinforcement layers of the hose. This standard is applicable to hoses of all inner diameter sizes and the following types of hose structures: Braided cloth hose:
Yarn braided hose:
Yarn wound hose;
Yarn knitted hose:
Yarn round woven hose!
Cord fabric hose;
Wire braided hose,
Wire wound hose!
Support spiral hose.
2 Reference standards
GB/T 2941
Standard temperature, humidity and time for environmental conditioning and testing of rubber specimens GB/T12833 Analysis method for multi-peak curves of tear strength and adhesion strength of rubber and plastics 3 Principle
Under specified conditions, use standard size specimens to measure the adhesion strength between the inner rubber layer and the reinforcement layer, the outer rubber layer and the reinforcement layer, and the reinforcement layers.
4 Test instrument
4.1 The test machine should be powered, equipped with an appropriate force measurement system and an automatic recording device, and the moving fixture can maintain a steady moving rate during the test. The force measurement accuracy of the test machine should comply with the provisions of the corresponding instrument standard. Note: A force measurement system without inertia should be used. 4.2 The specimen holder should be able to clamp the specimen so that the residual layer does not slide during the test. Note: It is recommended to use a self-tightening protrusion.
For strip specimens, the specimen must be in a plane parallel to the clamping surface of the fixture during the test. For example, a suitable weight can be fixed to the free end of the specimen or a support plate coated with a low-friction material such as polytetrafluoroethylene (PTE) can be installed in the upper clamp of the testing machine.
Technical supervision and approval on January 2, 1994, implementation on October 1, 1994
GB/T 14905-94
4.3 When testing annular specimens, a clamp that allows the specimen to slide should be provided (see Figure 1). The specimen is placed on the mandrel, and the mandrel is then mounted on two parallel suspension rods. There is a ball bearing at each end of the mandrel to allow the mandrel to rotate freely during the test. +
Figure 1 Schematic diagram of test fixture
1 Ear 12-Rod; 3-Test specimen 4-Bearing t5--Mandrel 5 Test specimen
5.1 Type of test specimen
In order to meet the test requirements of various types of structural hoses and various inner diameter specifications, seven types of test specimens are specified. 5.2 Selection of test specimens
In specific product standards, unless otherwise specified or otherwise agreed between relevant departments, the test specimen type should be selected according to the provisions in Table 1. Different test specimens and test results obtained from hoses of the same structure but different diameters cannot be compared. Table 1. Selection of samples
Hose structure
Woven cloth
Yarn weaving
Yarn knitting
Yarn round weaving
Yarn wound cord
Wire weaving
Wire sewing
Supported spiral hose
Bonded layers
Inner rubber layer and reinforcement layer
Between reinforcement layers
Outer rubber layer and vertical increase layer
Inner cavity layer and vertical increase layer
Between reinforcement layers
Outer rubber layer and reinforcement layer
Inner rubber layer and reinforcement layer
Reinforcement layer Between
Outer rubber layer and reinforcement layer
Inner rubber layer and reinforcement layer
Between reinforcement layer
Outer rubber layer and: reinforcement layer
Type 5"
See Note 3)
Type 2 or Type 6
Nominal inner diameter of hose d, mm
Type 2 or Type 31
See Note 3)
Type 2 or Type 6
Note: 1) If the adhesion is affected by the difficulty in obtaining a clear interface due to fabric breakage, it should be noted in the test report. a>50
See Note 3)
Type 2 or Type 6
GB/T 14905—94
2) When the inner diameter is less than 12.5 mm, the test cannot be carried out due to insufficient width of the specimen. 3) This test cannot be carried out because the steel wires are unravelling when the braided wire winding layers are peeled off. In any case, the resulting knot is obviously affected by the force required to bend the wire. 5.3 Specimen preparation
5.3.11 Type specimen
Cut a ring specimen with a width of 25±0.5 mm from the hose, and cut the ring specimen transversely to form a strip specimen (see figure Note: The method used when cutting the specimen must not cause performance degradation due to heat generated by the friction of the cutter. At this time, type 2.3, 5 or 6 specimens should be used. 5.3.22 Type specimen
Figure 21 Type specimen
Cut a section of hose with a length of 160 mm, and axially Cut it into two approximately equal halves, and then cut the rubber layer axially to a width of 25±0.5mm, 10±0.5mm or 5±0.5mm, depending on the width of the sample used. Be careful not to cut through the yarn, and peel off one end of the rubber layer to a certain length (see Figure 3).
GB/T-14905-94wwW.bzxz.Net
6=25±0.5 or, 10±0.5 or 5±0.2 Figure 32 Type sample
5.3.33 Type sample
Cut a 35±0.5mm wide ring from the hose and cut it horizontally to form a strip sample, then cut a 25±0.5mm wide sample around the hose in a direction perpendicular to the hose axis, be careful not to cut through the yarn, and peel off one end of the rubber layer to a certain length (see Figure 4). 5.3.44 Type sample
GB/T 1490594
35 ±2
Figure 43 type test specimen
Cut a section of hose with a length of 160mm, cut it into two approximately equal halves along the axial direction, then cut a strip test specimen with a width of 10±0.5mm, and peel off the end of the strip to a certain length (see Figure 5). If the width of the cut test specimen is less than 10mm, take the maximum width as much as possible.
5.3.55 type test specimen
GB/T 14905—94
Figure 54 type test specimen
Cut a section of hose with a length of 160mm, cut it into two approximately equal halves along the axial direction, then cut a rubber layer test specimen with a width of 5±0.2mm at the center of the rubber layer of the test specimen. And peel off one end to a certain length (see Figure 6). 5.3.66 type test specimen
GB/T1490594
Figure 65 type test specimen
Cut a ring test specimen with a width of 35±2mm from the hose, and the width of the working part of the test specimen is 25±0.5mm. Use a cutter to cut the outer rubber around the working part of the test specimen. After the steel wire is exposed, the outer rubber layer of the working part of the test specimen is cut in the axial direction, and it is peeled off for a certain length (see Figure 7).
Equal energy height
Figure 76 type test specimen
5.3.77 type test specimen
Cut a long strip from the hose wall along the spiral direction of the reinforcement layer, and process it into a test specimen with a length of 160mm and a width of 25±0.5mm, and leave one end open for a certain length (see Figure 8). If the width is less than 25mm, the maximum width can be obtained as much as possible. Note: This test specimen is only applicable to support screw hoses with a screw spacing greater than 10 mm, and is not applicable to hoses of a certain length with special ends and assembled pipe joints.
5.4 Conditioning of test specimens
GB/T 14905-94
Figure 87 Type test specimen
Any test should be carried out 24 hours after the hose is manufactured. The sample should be conditioned at the standard temperature and humidity of the laboratory for at least 16 hours. This period of time can be used as part of the 24-hour conditioning time after manufacturing. After the sample is manufactured, it should be conditioned at the standard humidity of the laboratory for at least 3 hours before testing.
For comparative tests, they should be carried out at the same time interval after the product is manufactured as much as possible. 6 Test steps
6.1 A separate test specimen should be used for each interface to be tested. 6.2 Remove the sample from the conditioning environment and use an accuracy of 0.Measure the actual width (mm) of the specimen with a 5mm gauge. When the peeled end of the specimen is clamped on the two clamps, the clamping surfaces of the two clamps should be in the same plane of the peeling force axis to ensure uniform distribution of tension, no distortion of the specimen during peeling, and a peeling angle of about 180° for strip specimens and about 90° for ring specimens. 6.3 Adjust the tensile testing machine so that the moving speed of the lower clamp is 50±5nm/min. 6.4 Start the testing machine and perform continuous peeling, recording the force (N) required to peel at least 100mm long. If the specimen is less than 100mm long, the force required to peel the longest distance should be recorded. If peeling occurs at other locations, such as separation within one of the two layers under test, such separation should be noted in the report and the force at the time of separation should be recorded. The use of instructions; 11 IS0 8033-1991 stipulates 16h. 7. Representation of test results
GB/T 14905-94
The curve obtained from the automatic recorder shows the change of the tensile force between the layers during peeling. 7.1 The bonding strength of the sample shall be determined by the corresponding method specified in GB/T-12833. The peak median of the force shall be determined from the curve, and then the peak median of the force shall be divided by the effective width of the sample to obtain the bonding strength, expressed in kN/m. 7.2 The arithmetic mean of the two samples shall represent the test results of the sample, and the test results shall be rounded to one decimal place. 8. Test report
The test report shall include the following:
Hose name and specification:
Hose manufacturing date and batch number:
Standard name and code based on which the test is conducted;
d, test temperature, test date
Type of sample used, test results:
Value method adopted (A, B or C method) t.
Tester.
Adoption instructions:
17ISO8033--1991 does not specify the number of samples. Additional instructions:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Rubber and Rubber Products Standardization Technical Committee for Hose. This standard was drafted by the Shenyang Rubber Industry Products Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Huang Renhe
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