Rapeseed yield comes from cooking temperature and barrel load before press model

Key parameters

Rapeseed hot-press and cold-press parameters side by side

Process reality

What the cooking step actually does to rapeseed yield

Rapeseed kernels are small (1.8–2.2 mm diameter) with a thin, waxy seed coat that resists oil release unless the cell walls are softened first. Cooking at 95–105°C for 15–20 minutes raises cell-wall permeability, reduces oil viscosity, and coagulates the protein matrix so it does not hold oil by adsorption during pressing. A barrel fed at the right moisture (7–9% entering the cooker) and pressed immediately after discharge yields 38–44% — at the high end of the range. Feed that skips cooking or cooks too short drops to 32–35%, which is barely better than cold press without the quality upside. The hydraulic press then works the same way regardless of model: a 2.2 kW pump builds to 60 MPa, the ram descends, and the mechanical relief valves bleed pressure at setpoint — the operator does not adjust pressure by model. What changes with model number is frame stiffness and how well the frame holds that pressure steady over years of repeated cycles. A 300 or 325 ton frame is the standard rapeseed hot-press choice because the hot cycle runs at lower effective pressing stress than cold; a 355 or 400 ton frame is worth the cost only when you plan cold-press runs, extended daily hours, or simultaneous multi-press operation. Cake emerges at 8–10% residual oil on hot press; cake protein reads 35–40%. Double-low (low glucosinolate, low erucic acid) varieties produce a glucosinolate-free cake that commands a wider feed-buyer market than conventional rapeseed or mustard cake, which requires restrictions on feeding rate to non-ruminants.

Project boundary

What to confirm before scoping Rapeseed Hydraulic Oil Press

Rapeseed Hydraulic Oil Press should not be quoted from an equipment name alone. Check feed lots, target oil, post-press handling, and packing rhythm in one scope before deciding which Rapeseed / Canola Oil Press modules stay. Listed on the factory hot-press page — discuss 300/325 first.

When feed condition, moisture, impurities, batch weight, and product position are unclear, press tonnage and filter area become guesswork. Factory systems share 60 MPa and 2.2 kW motors; hot pure press is 30–40 min/barrel and cold pure press is ~2 h/barrel — cycle time matters more than brochure tonnage.

• Confirm whether feed is whole seed, kernels, pretreated material, or an existing semi-finished stream.
• Confirm whether the target is crude oil, filtered oil, bottled oil, drum ingredient oil, or a refining handoff.
• Hot cycle reference: pure press 30-40 min/barrel, ~1.5 h for 2 barrels with loading; cold pure press ~2 h/barrel, ~4.5 h for 2 barrels.
• Confirm batch rhythm, labor, changeover, retained samples, power (often 380V/50Hz/3ph), and site install conditions.

Factory model check

Match hot / cold models to factory hard data

Pin models to published factory specs before tonnage talk.

Hot 300/325: 300–325 ton, 60 MPa system, standard barrel Ø390×800 mm / max 100 kg, pure press 30–40 min/barrel, ~1.5 h for 2 barrels with loading, 2.2 kW motor. Cold 355/400/426/480/500: 370–630 ton, integrated frame, same 100 kg standard barrel, pure press ~2 h/barrel, ~4.5 h for 2 barrels with loading; optional Ø300 high-pressure barrel max 60 kg. Residual oil target ~≤5% (peanut hot often 6–8% measured).

• Standard barrel Ø390×800 mm, max ~100 kg crushed feed; optional Ø300 high-pressure barrel max ~60 kg.
• Cylinder material 27SiMn; cold frames are integrated molded steel; hot frames are typically H-type channel steel.
• Listed on the factory hot-press page — discuss 300/325 first.

Equipment check

project scope needs to land in equipment interfaces

Once the route is clear, write the interfaces: how preparation feeds the press, how oil leaves the press, how filtration connects to tanks, and how packing receives finished oil.