Adhesive tape technical standards
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Technical Parameters and Standards1.1 Ordinary cotton canvas
Item | Unit | Standard (GB/T7984-2001) | Committed Standard
---|---|---|---
Longitudinal tensile strength | N/mm | 160, 200, 250, 315, 400, 500, 630 | Greater than or equal to the corresponding standard value
Longitudinal elongation at break | % | ≥10.0 | ≥10.0
Elongation under 10% load | % | ≤4 | ≤3
Cover rubber properties
Tensile strength | MPa | ≥15.0 | ≥17.0
Elongation at break | % | ≥350 | ≥400
Abrasion resistance | mm³ | ≤200 | ≤180
Adhesion properties
Top cover rubber to belt core | N/mm | ≥2.7 | ≥3.2
Between layers | N/mm | ≥2.1 | ≥3.0
Bottom cover rubber to layers | N/mm | ≥3.2 | ≥3.5
1.2 Ordinary nylon belts
Item | Unit | Standard (GB/T7984-2001) | Committed Standard
---|---|---|---
Longitudinal tensile strength | N/mm | Strength per layer × number of layers | Greater than or equal to the corresponding standard value
Longitudinal elongation at break | % | ≥10.0 | ≥10.0
Elongation under 10% load | % | ≤4 | ≤3
Cover rubber properties
Tensile strength | MPa | ≥15.0 | ≥17.0
Elongation at break | % | ≥350 | ≥400
Abrasion resistance | mm³ | ≤200 | ≤180
Adhesion properties
Top cover rubber to belt core | N/mm | ≥3.5 | ≥4.3
Between layers | N/mm | ≥4.5 | ≥5.6
Bottom cover rubber to layers | N/mm | ≥3.2 | ≥3.9
Note: The tensile strength per layer for nylon fabric is 100, 150, 200, 250, and 300 respectively.
1.3 Heat-resistant belts
1.3.1 Type 1: Heat-resistant belts rated for 100°C
Item | Unit | Standard (HG/2297-92) | Committed Standard
---|---|---|---
Longitudinal tensile strength | N/mm | 160, 200, 250, 315, 400, 500, 630, 800 | Greater than or equal to the corresponding standard value
Longitudinal elongation at break | % | ≥10.0 | ≥10.0
Elongation under 10% load | % | ≤4 | ≤3
Cover rubber properties
Abrasion resistance | mm³ | ≤200 | ≤180
Adhesion properties (for cotton canvas):
Top cover rubber to belt core | N/mm | For cover layer thickness ≤1.5 mm: adhesion strength ≥2.2; for cover layer thickness >1.5 mm: adhesion strength ≥2.6
Between layers | N/mm | ≥2.6
Bottom cover rubber to layers | N/mm | For cover layer thickness ≤1.5 mm: adhesion strength ≥2.2; for cover layer thickness >1.5 mm: adhesion strength ≥2.6
1.3.2 Type 2: Heat-resistant belts rated for 125°C; Type 3: Heat-resistant belts rated for 150°C
Item | Unit | Standard (GB/2297-92) | Committed Standard
---|---|---|---
Longitudinal tensile strength | N/mm | Strength per layer × number of layers | Greater than or equal to the corresponding standard value
Longitudinal elongation at break | % | ≥10.0 | ≥10.0
Elongation under 10% load | % | ≤4 | ≤3
Adhesion properties:
Top cover rubber to layers | N/mm | ≥3.5
Between layers and belt core | N/mm | ≥4.5
Bottom cover rubber to layers | N/mm | ≥3.2
Cover rubber properties:
Abrasion resistance | cm³/1.6 km | ≤1.2
1.3.3 Changes in physical properties of heat-resistant cover rubber
Item | Type 1 | Type 2 | Type 3 | Range of variation
---|---|---|---|---
Hardness: Difference between post-aging and pre-aging values (IRHD) | 20 ± 20 | | |
Maximum post-aging hardness value (IRHD) | 85 | | |
Percentage reduction in tensile strength after aging | ≤25 | ≤30 | ≤40 |
Minimum post-aging tensile strength value (MPa) | 12 | 10 | 5 |
Percentage reduction in elongation at break after aging | ≤50 | ≤55 | |
Minimum post-aging elongation at break value (%) | 200 | 180 | |
1.3.4 Flame-retardant conveyor belts for general use
Item | Unit | Standard (GB10822-89) | Committed Standard
---|---|---|---
Longitudinal tensile strength | N/mm | 100, 125, 160, 200, 250, 315, 400, 500, 600, 630, 800, 900, 1000 | Greater than or equal to the corresponding standard value
Longitudinal elongation at break | % | ≥10.0 | ≥10.0
Elongation under 10% load | % | ≤4 | ≤3
Cover rubber properties
Tensile strength | MPa | ≥10.0 | ≥15.0
Elongation at break | % | ≥350 | ≥400
Adhesion properties (for cotton canvas):
Top cover rubber to belt core | N/mm | For cover layer thickness ≤1.5 mm: adhesion strength ≥2.4; for cover layer thickness >1.5 mm: adhesion strength ≥2.7
Between layers | N/mm | ≥2.7
Bottom cover rubber to layers | N/mm | For cover layer thickness ≤1.5 mm: adhesion strength ≥2.4; for cover layer thickness >1.5 mm: adhesion strength ≥2.7
Adhesion properties 2 (for nylon fabric):
Top cover rubber to belt core | N/mm | For cover layer thickness ≤1.5 mm: adhesion strength ≥3.5; for cover layer thickness >1.5 mm: adhesion strength ≥3.9
Between layers | N/mm | ≥2.7
Bottom cover rubber to layers | N/mm | For cover layer thickness ≤1.5 mm: adhesion strength ≥3.5; for cover layer thickness >1.5 mm: adhesion strength ≥3.9
Safety performance:
1. Flame-retardant performance: The average duration of flame spread across three longitudinal full-thickness specimens must not exceed 60 seconds; additionally, no re-ignition should occur in any individual test result. 2. Flame retardant and static dissipative property K: The flame retardancy requirements are the same as those specified in J; the static dissipative property shall be no greater than 3×108 ohms.