News

Trade news

Company news

FAQ

Plastic sheet extruder, plastic sheet production line

Time：

2017-10-10

1. During the application of polyurethane plastic materials, water is the greatest concern: even a single drop of moisture contacting the adhesive before it has fully cured can create a large bubble. Therefore, workers operating in high-temperature conditions should keep towels handy to wipe away sweat. When laying the adhesive surface, it is essential to monitor weather conditions and take appropriate precautions against moisture.

Emergency measures to prevent sudden showers. The rubber‑surface installation should be scheduled to avoid the early morning hours, when atmospheric and ground humidity are at their highest. Even on clear, typical workdays, it is generally best to begin paving after 9:00 a.m. for synthetic track construction.

2. The actual installed thickness of the rubber surface refers to the distance from the rubber base to the center of the top-layer rubber granules, and it is typically controlled in two ways. First, a preliminary thickness check is performed using formwork; any locally raised areas on the subgrade are trimmed or compacted by hammering to bring them down. If the elevation difference is minor, a straightedge can be used for leveling.

A scraper is used to remove excess material and ensure uniform thickness. At the main competition area of the synthetic track at the North Suburb venue of the 11th Asian Games, to guarantee the specified thickness, tolerances are controlled as positive deviations, resulting in an average thickness exceeding 14 mm.

3. Construction experience for ensuring no water pooling on synthetic tracks after rain: A. To guarantee uniformity, maximize the paving span; on the main track, the span is 3.66 meters (with three lanes paved simultaneously), while in non-competition areas, the span exceeds 4 meters. B. Typically, localized water accumulation will occur in the north and south semicircles after rainfall.

The issue is particularly severe in the semicircular area of the high jump runway. To ensure proper slope, it is advisable to adopt a “turtle-back” construction method, which facilitates drainage.

4. To prevent localized bubbling and delamination after the rubber surface is laid, it is essential to strictly control the compaction of the base layer, ensuring that the asphalt base course is properly compacted and bonded. Otherwise, poor adhesion and surface blistering may occur, leading to cracking of the rubber surface. In areas where the base layer lacks sufficient compaction, the following measures may be adopted:

Reinforcement is achieved by drilling holes and injecting adhesive (rubber anchors).

5. To ensure flatness and proper slope, after the formwork strips are securely nailed in place, use a level to perform a mock alignment. For areas on the base layer that are slightly elevated, level them first; for any depressions, fill them with adhesive.

6. Any foundation areas contaminated or corroded by diesel must be thoroughly excavated and filled with sealant.