Office Chair Tray Welding

Answers to questions related to office chair tray welding are as follows:

Fault Causes and Impacts

A common reason for an office chair to tilt backward is that the tray has become unwelded or developed cracks. As a key component connecting the seat to the gas lift, if the tray is not firmly welded, it is prone to breakage under long-term use or uneven stress. The high temperatures generated during welding can directly damage the gas lift, which is highly sensitive to heat. Once damaged, the gas lift will fail to regulate pressure properly, potentially leading to safety hazards. Therefore, the quality of tray welding directly affects the stability and safety of the office chair.

Tray Welding Equipment and Process

The tray welding machine (oil-pressure hot plate welding machine) is specialized equipment. Its core principle involves using an electric heating plate to transfer heat to the welding surface of plastic parts, causing the material to melt and bond. The equipment is driven by hydraulic or pneumatic systems, with a control system primarily based on PLC (Programmable Logic Controller) and a touchscreen human-machine interface, allowing precise control of welding parameters (such as temperature, pressure, and time). Common welding areas are 1.5 meters × 1.5 meters or 1.8 meters × 1.5 meters, suitable for thermoplastic materials like PP and PE. The welding strength can reach over 70% of the plastic's base strength, ensuring structural stability.

Characteristics of Plastic Tray Products

Welded plastic trays are industrial double-sided trays, with the main material being HDPE (High-Density Polyethylene) or HDPP (High-Density Polypropylene). The upper and lower parts are welded together using a hot plate welding process. Their advantages include:

• Non-toxic and environmentally friendly: Meeting hygiene standards for the food and chemical industries;
• Strong corrosion resistance: Capable of withstanding erosion from acids, alkalis, and salt spray;
• High and low-temperature resistance: Adaptable to environments ranging from -40°C to 80°C, without deformation;
• High mechanical strength: Strong load-bearing capacity, suitable for stacking and forklift handling in warehousing and logistics.

Welding Quality and Maintenance Recommendations

To prevent tray unwelding, regularly inspect the welding area for cracks or looseness, especially at the connection between the seat and the gas lift. If unwelding is detected, immediately stop using the chair and replace the tray to prevent damage to the gas lift from high temperatures. Additionally, regularly maintain the welding equipment to ensure uniform heating plate temperature and stable hydraulic system pressure, guaranteeing welding quality. For plastic trays, avoid prolonged exposure to UV light or extreme temperatures to extend their service life.