Theoretically, the service life is closely related to the selection of raw materials, production process, use environment, maintenance and care. The overall service life of hollow blown-moulded seats is also related to multiple factors. For example, when high-density polyethylene is used outdoors, the service life can reach 3-5 years. If anti-UV ingredients are added, the service life can be extended to more than 5 years. For raw materials that have not been treated for weather resistance, long-term exposure to the sun will accelerate aging, and a shortened lifespan is inevitable. If used in high or high temperature environments, it may cause deformation or cracking of the material, which will also shorten the service life. Therefore, the use environment is also an important factor affecting the service life of hollow blown-moulded seats. In addition, there is another very important point, which is the production process. Seats produced with high-strength molds have a more stable structure and a longer service life. The aluminum frame + powder coating treatment can also improve the overall durability, making its service life up to 8 years.
Locking in quality from the source is the foundation for ensuring the production of high-quality hollow blown-moulded seats. When selecting materials, it is necessary to avoid "passing off inferior products as good ones" and select core materials based on the usage scenario. The materials must have test reports and avoid the use of recycled materials. During production, relevant parameters must be clearly defined. For example, the seat thickness should be 2.5–4mm. If the thickness is less than this, it will easily deform during use. The density must be ≥0.94g/cm3 to directly ensure strength. The temperature range requires outdoor use of -40℃-60℃ without cracking, and long-term stable use indoors of -20℃-80℃.
The shape design of the hollow blown-moulded seat depends on the mold, so the design drawing of the mold needs to be determined by the user and a 3D drawing should be provided. The parting line, gate, vent, and thickness should be marked on it. The design of the vent can ensure that the gas can be discharged smoothly during blow molding. It can be seen that every design is very effective.
The production process of hollow blown-moulded seat also requires real-time monitoring, with each stage requiring specific attention. For example, during the molding process, the extrusion temperature is 180–220°C, and the mold temperature is 40–60°C. Excessively high temperatures can lead to material degradation, while too low temperatures can result in an incomplete mold. Surface ripples are also likely due to low temperatures. Another example is the relationship between blowing pressure and time: too low a pressure can lead to an uneven surface, while too high a pressure can result in thin walls. Too short a time can lead to insufficient cooling, while too long a time can affect efficiency.
Durability depends on details, and the post-processing of hollow blown-moulded seat is also very important. Because the edges of blow-molded products have excess burrs, manual and mechanical polishing can be used to ensure smooth edges without burrs. You can touch them to ensure there are no obvious protrusions. If a customized pattern is required, the ink type must be determined first. The inks selected for outdoor and indoor use are different. Hollow blown-moulded seats are visually inspected before leaving the factory. There are no obvious scratches, bubbles, shrinkage marks, or color differences. Calipers are used for measurement, and the deviation must be ≤±2mm. A load-bearing test is performed by applying 1.5 times the rated load to the center of the seat. After 2 hours, there is no obvious deformation.
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