HN-CG60 Pre-Press Machine (Screw Expeller)
The HN-CG60 uses a screw-type crushing principle with features of low noise, stable operation, no wear parts, and very low maintenance cost.
It can perfectly crush rapeseed, soybeans, flax seeds, Sichuan pepper seeds, sesame, walnut kernels, peanuts, and many other materials. Use it as a first-pass extraction before the hydraulic press to maximize total yield.
- Screw-type continuous crushing principle
- Low noise operation โ suitable for urban workshops
- No wear parts โ minimal maintenance cost
- 300โ350 kg/h
- Optional 11 KW version โ up to 750 kg/h
- Perfect first step before hydraulic press for mustard/rapeseed lines
- Compact: 1030ร1000ร750 mm, only 174 kg
Specifications
| Parameter | Standard Version | Upgraded (11KW) |
|---|---|---|
| Power | 7.5 KW | 11 KW |
| Voltage | 380V | 380V |
| Output | 300โ350 kg/h | 750 kg/h |
| Weight | 174 kg | |
| Dimensions | 1030ร1000ร750 mm | |
| Principle | Screw-type crushing | |
How the Screw Pre-Press Expeller Works
The screw press expeller operates on a continuous screw-type crushing principle. Oil seeds are fed into the hopper and carried forward by a rotating screw shaft inside a cylindrical barrel. As the seeds advance, the open space between the screw flights progressively narrows, creating increasing mechanical pressure. This pressure ruptures the oil-bearing cells, releasing crude oil that flows through perforated gaps in the barrel cage while the compressed seed cake exits at the discharge end. The shaft rotates at 1460 r/min, delivering consistent throughput with very low noise and vibration.
Why incorporate a pre-press machine before the final hydraulic press? Hard-shelled seeds like rapeseed, flax seeds, and mustard seeds contain oil locked within tough cellular structures. A single-stage hydraulic press alone may only extract 60-70% of the available oil. The HN-CG60 oil seed expeller breaks open these cells first, softening the material and releasing approximately 35-40% of the oil in the pre-press pass. The partially de-oiled cake then enters the hydraulic press in an optimized state โ softer, warmer, and with oil already partly mobilized โ boosting the total oil yield by 3-5%. This two-stage approach (screw pre-press โ hydraulic final press) is standard practice in commercial oil mills across India, Southeast Asia, and Africa for mustard, rapeseed, and groundnut processing lines. Importantly, the screw mechanism has no easily worn parts, keeping long-term maintenance costs near zero.
Application Scenarios & Use Cases
Mustard & Rapeseed Mills (India, Bangladesh, Nepal)
Mustard seed retains 15-20% residual oil after single-stage pressing. Adding an HN-CG60 screw press expeller as the first pass recovers an extra 3-5% โ that is 30-50 kg more oil per ton of seed processed. Indian mill owners typically see ROI within 2-3 months.
Flaxseed & Sesame Processing (Africa, Middle East)
Flax seeds are small and hard, making direct hydraulic pressing inefficient. The HN-CG60 oil seed expeller softens flax and sesame through continuous crushing, improving cake porosity for the subsequent hydraulic press. Ethiopian and Nigerian buyers favor this machine for flaxseed throughput.
Peanut & Walnut Kernel Lines (Southeast Asia, Vietnam)
The standard 7.5 KW version handles 300โ350 kg/h of peanut kernels โ ideal for small to mid-scale Vietnamese and Indonesian producers. The upgraded 11 KW model doubles throughput to 750 kg/h for high-volume operations.
Sichuan Pepper Seed & Specialty Oils (China Export)
Sichuan pepper seeds (prickly ash) have a unique oil profile requiring gentle pre-crushing. The HN-CG60 screw mechanism handles these irregular seeds without clogging, making it a preferred pre-press machine for specialty cold-pressed oil exporters.
Operation Tips & Best Practices
- Pre-heat the barrel: Run the machine empty for 2-3 minutes before feeding. A warm barrel reduces initial seed friction and helps the first oil flow smoothly.
- Moisture check before feeding: Seeds with 6-8% moisture content produce the best pre-press results. Overly dry seeds generate excess fines; overly moist seeds produce emulsion instead of clean oil.
- Maintain steady feed rate: A uniform, consistent feed is critical. Overfeeding jams the screw; underfeeding reduces throughput and increases friction wear on the screw flights.
- Adjust the discharge cone gap: Tighten for smaller seeds (sesame, flax); loosen for larger kernels (peanuts, walnuts). Make adjustments in small increments while the machine is running.
- Daily cleanup routine: After each production run, feed a small amount of coarse bran through the pre-press machine to absorb residual oil and clean the screw surfaces. Wipe down the barrel exterior.
- Oil tray inspection: Keep the collection tray clean and free of sediment buildup. A clogged tray backs oil into the barrel housing, reducing extraction efficiency.
- Motor belt tension: Check belt tension monthly. The 7.5 KW motor runs at 1460 r/min โ loose belts cause slippage, lower throughput, and premature belt wear.
Frequently Asked Questions
What throughput can I expect?
Standard: 300โ350 kg/h. Upgraded 11 KW: 750 kg/h. Actual output depends on seed type and moisture content.
Which seeds work with the HN-CG60?
Rapeseed, soybeans, flax, Sichuan pepper seeds, sesame, walnut, peanuts, sunflower seeds, cotton seeds โ virtually all common oil-bearing seeds with small to medium kernel size.
What are the price and delivery terms?
Contact us via WhatsApp or email for current FOB/CIF pricing. Lead time: 7-15 working days. Shipping: 15-35 days to major ports worldwide.
Is maintenance expensive or complicated?
Extremely low maintenance. The no-wear-parts design means almost zero spare parts cost. Daily bran cleaning, monthly belt check, periodic bearing lubrication โ that is it.
How does this compare to a standalone screw press?
Standalone screw presses do one-pass extraction at 30-80 kg/h. The HN-CG60 pre-presses at 300-750 kg/h โ cake then goes to a hydraulic press. Two-stage = more oil + better quality.
Can I install the machine myself?
Yes. The HN-CG60 is compact (1030ร1000ร750 mm, 174 kg). It arrives fully assembled. Place on level surface, connect to 380V, and start. No specialized installation required.
Equipment Comparison: Pre-Press vs. Direct Press
Two-Stage: HN-CG60 Pre-Press + Hydraulic Press
- Total oil yield: 90-95% of available oil
- Oil quality: Clean, low sediment, premium grade
- Throughput: 300-750 kg/h (pre-press stage)
- Operating cost: Moderate (two machines, more electricity)
- Best for: Commercial mills targeting maximum yield
- Cake value: High-quality de-oiled cake for animal feed
Single-Stage: Standalone Screw Oil Press Only
- Total oil yield: 65-75% of available oil
- Oil quality: Higher sediment, needs filtering
- Throughput: 30-80 kg/h (single machine)
- Operating cost: Lower (one machine, less power)
- Best for: Small village mills with modest volume
- Cake value: Higher residual oil, lower feed value