A plastic hydraulic briquetter is essential equipment in recycling facilities, particularly in li battery recycling equipment lines where it compresses plastic separator films into dense blocks with a volume reduction ratio of up to 10:1. Like all hydraulic machinery, the performance and longevity of a plastic hydraulic briquetter depend heavily on selecting the correct hydraulic oil.
Why Hydraulic Oil Matters for Briquetters
Hydraulic oil serves as both the power transmission medium and the lubricant in a briquetting system. It transfers force from the hydraulic pump to the ram or piston that compresses plastic materials. The right oil ensures smooth operation, prevents overheating, protects pump components from wear, and maintains consistent compression force. Using the wrong oil can lead to sluggish operation, internal leaks, pump cavitation, and premature equipment failure.
Recommended Oil Type: Anti-Wear Hydraulic Oil
For hydraulic briquetter equipment, manufacturers typically recommend anti-wear (AW) hydraulic oils. These oils contain zinc-based additives that form a protective layer on metal surfaces under high pressure. This is especially important in briquetters, which operate under significant load when compressing plastic films into solid blocks. Anti-wear oils are classified as L-HM in the Chinese standard (GB/T 7631.2) or simply AW oils in international markets.
Avoid using standard R&O (Rust and Oxidation) oils in briquetters, as they lack the anti-wear additives necessary for high-pressure hydraulic pumps and valves. Similarly, never substitute motor oil or automatic transmission fluid (ATF), as these contain detergents and friction modifiers that can cause foaming and seal damage in hydraulic systems.
Selecting the Right Viscosity Grade
Viscosity is the most critical property when choosing hydraulic oil. It determines how easily the oil flows and how well it maintains a lubricating film. The ISO Viscosity Grade (VG) system classifies oils by their kinematic viscosity at 40°C. For plastic hydraulic briquetters, the following grades are most common:
- ISO VG 32: Suitable for indoor operations in temperate climates where startup temperatures are moderate. It flows easily and reduces energy consumption during cold starts.
- ISO VG 46: The most widely recommended grade for general-purpose briquetting operations. It offers an excellent balance between cold-start fluidity and high-temperature film strength, making it the safest choice when manufacturer specifications are unavailable.
- ISO VG 68: Ideal for heavy-duty operations, hot environments, or continuous-duty briquetters that generate significant heat during compression cycles. The thicker oil maintains proper viscosity at elevated temperatures.
Special Considerations for Plastic Briquetting
Plastic hydraulic briquetters handling separator films from lithium battery recycling have unique operational characteristics. The hydraulic system must deliver steady, high force to achieve the 10:1 volume compression ratio. During extended operation, the oil temperature can rise significantly. If your facility operates in a warm climate or runs the briquetter continuously, ISO VG 46 or even VG 68 may be necessary to prevent the oil from thinning excessively.
For facilities in cold regions, consider low-pour-point hydraulic oils such as L-HV or L-HS grades. These multi-viscosity formulations maintain fluidity at temperatures as low as -30°C to -40°C, ensuring reliable startup and preventing pump damage from oil starvation.
Oil Change and Maintenance Best Practices
Regular oil maintenance extends the life of your briquetter. Check the oil level daily and inspect for contamination. Plastic dust and debris from the recycling process can enter the hydraulic reservoir if seals are compromised. Change the oil and filters according to the manufacturer's schedule, typically every 2,000 to 4,000 operating hours for mineral-based oils. Synthetic hydraulic oils can extend this interval to 5,000 hours or more, though they require a higher initial investment.
Always follow the equipment manufacturer's manual as the primary reference for oil selection. When in doubt, ISO VG 46 anti-wear hydraulic oil is the most versatile and widely accepted choice for plastic hydraulic briquetters in standard operating conditions.
