What are the key quality inspection items for a plastic track and field surface? The quality assessment of a plastic track involves both visual and physical-mechanical testing.
1. **Visual Inspection**: This includes checking the uniformity of the surface color, the adhesion of rubber particles, the bond between the top layer and the base, the presence of any hollow spots, and whether the thickness meets the design specifications.
2. **Physical and Mechanical Testing**: Standard tests include hardness (Shore A), tensile strength, pull-out defect length, compression recovery, rebound value, and flame resistance. These tests are typically conducted on samples measuring 500mm × 500mm × actual thickness.
In addition, for large-scale venues, especially those used in international competitions, further tests required by IAAF standards must be included. These may involve buffer performance, vertical deformation, friction, tensile strength at break, and elongation.
How to measure the thickness, slope, and distance of a plastic track and field?
**Thickness Measurement**: On-site, a three-needle thickness gauge is commonly used. For ultra-thin sections (less than 10mm), core sampling is performed. A 20–25cm diameter core is taken, polished, and measured with a high-precision thickness gauge (0.01mm accuracy). A 4mm plunger and a 0.8–1.0N tester are used to ensure accurate readings.
**Slope Measurement**: A level gauge is used to measure both transverse and longitudinal slopes. For cross-slope, the height difference between the middle and outermost parts of the first lane is measured and compared to the horizontal distance. For longitudinal slope, two points at least 40 meters apart are measured, and the difference is divided by the distance to calculate the slope.
**Distance Measurement**: In straight sections, a laser range finder is used. In curved sections, a theodolite is used to mark every 5 degrees. Distances from the center point are measured, and the distance between center points is compared to the design value. The 400m track should have an allowable error of +4cm, while the 100m should not exceed +1cm.
These detailed inspections ensure that the track meets safety, performance, and standard requirements, providing athletes with a reliable and consistent surface for training and competition.
Bird netting or bird netting is a form of bird pest control. It is a net used to prevent birds from reaching certain areas.
Bird netting comes in many shapes and forms, the most common being small mesh (1 or 2cm square), made from extruded and bidirectional polypropylene or woven polyethylene.
The most commonly used colors are black, white or green bird netting
Professional bird netting comes in large rolls, saving the farmer or aquaculturer a lot of money. Retail chains and local stores will offer smaller packages to meet the needs of backyard gardeners.
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