Filter Press Machine For Edible Oil Refining

In the edible oil refining process, filter presses are key equipment for ensuring the purity and economic value of oil products. In view of the physical properties of different oils (such as wax content, acid value, viscosity, etc.), the industry mainly adopts five types of special filter press machine. In this post, Yuwei Filtration will systematically analyze their technical key points:

Plate and Frame Filter Press

Applicability: ★★★☆☆
Core Scenario: Low-temperature dewaxing of high-wax oils (rice bran oil/sunflower oil)
Working Principle:

1. Filter Pressing:

Hydraulic cylinder locks filter plates and frames to form sealed chambers

2. Low-Temperature Feeding:

Pump 5-10°C crude oil into chambers to crystallize wax

3. Filtration:

20-50μm polypropylene filter cloth traps wax crystals and solids

4. Manual Discharge:

Scrape high-purity wax cake (cosmetic raw material) after releasing plates

Price Reference:

• Basic manual model (20m²): ¥80,000-150,000
• Upgrade: Filter frame heater (anti-wax clogging): +¥30,000
  Value Point: Complete recovery of high-value wax

Stainless Steel Plate and Frame Filter Press

Applicability: ★★★★☆
Core Scenario: Contamination-free filtration of pharmaceutical-grade oils (fish oil/MCT oil)
Working Principle:

1. CIP Pre-cleaning: Circulate 80°C food-grade alkali for sterilization
2. Dual-Stage Filtration:

• Primary: 316L metal screen (50μm) intercepts large particles
• Secondary: Food-grade filter paper (10μm) adsorbs colloids

3. Nitrogen Shielding: Maintain <0.5% oxygen in sealed environment

Price Reference:

• Semi-automatic model (15m²): ¥250,000-400,000
• Upgrade: Aseptic sampling valve: +¥20,000
  Breakthrough: Meets GMP aseptic standards

Chamber Filter Press

Applicability: ★★★★☆
Core Scenario: Regeneration of waste frying oil (high acid value/polymer residues)
Working Principle:

1. High-Temperature Filtration:

• Pump 120°C waste oil mixed with diatomite (filter aid) into chambers
• Heat-resistant polyester cloth (5μm) captures carbonized polymers

2. Pressing Dehydration:8MPa hydraulic pressure reduces residual oil
3. Vibration Discharge: Automatic plate shifting + high-frequency vibration

Price Reference:

• Fully automatic model (30m²): ¥400,000-800,000
• Critical Upgrade: Integrated CIP system: +¥100,000-150,000
  Regeneration Benefit: 40% increase in oil recovery rate

Stainless Steel Filter Pad Refining Press

Applicability: ★★★★★
Core Scenario: Flavor preservation of cold-pressed premium oils (olive/walnut oil)
Working Principle:

1. Graded Filtration:

• 1st stage: 20μm coarse pads remove pulp residues
• 2nd stage: 5μm activated carbon pads adsorb pigments
• 3rd stage: 1μm cellulose pads trap colloids

2. Oxygen Control:

• ≤50°C cooling water circulation
• Nitrogen blanket (<1% oxygen)
  Price Reference:
• Vertical automatic model (10t/day): ¥600,000-1,200,000
• Consumables: Filter pads ¥300/m² (replaced twice monthly)
  Quality Assurance: >95% polyphenol retention

Membrane Filter Press

Applicability: ★★★★☆
Core Scenario: Deep desoaping of high-viscosity oils (palm/soybean oil)
Working Principle:

1. Two-Stage Pressing:

• Primary: Separate soapstock at 0.6MPa feed pressure
• Membrane squeeze: Inject 1.8MPa water for secondary pressing

2. Air Blow-Through: Compressed air recovers residual oil from cake pores
3. Auto-Discharge: Cake self-releases when plates open (<3% residue)

Price Reference:

• Food-grade modified model (50m²): ¥1,000,000-1,800,000
• Core Modification: EPDM diaphragm (120°C resistant): +¥80,000
  Efficiency Advantage: Soapstock residual oil <18%

Plate and frame filter presses are used for dewaxing rice bran oil and recovering wax cakes; stainless steel plate and frame filter presses ensure the safety of oils used in infant milk powder; box-type filter presses enable the recycling of waste frying oil; stainless steel paperboard precision filters protect olive oil polyphenols; and diaphragm filter presses perform in-depth treatment of palm oil soap stock —— these five types of oil filter press machine have reconstructed the core links of the edible oil filtration value chain through specialized division of labor. Only by accurately matching the filter press technology according to the characteristics of the oil can the maximum economic benefits be achieved.