Revealing the Professional Equipment & Processes Behind Fruit Juice Concentrate — Features, Advantages and Disadvantages

Introduction

Fruit juice concentrate is one of the most essential raw materials in the modern food industry — from juice beverages on supermarket shelves, to fruit-flavoured seasonings in the foodservice industry, to baby food and functional drinks, all depend on it. Yet transforming a fresh apple or orange into 70°Brix concentrate requires a highly sophisticated processing chain: washing → milling/crushing → enzymatic treatment → pressing/extraction → clarification → concentration → pasteurisation → aseptic filling.

Within this chain, extraction/pressing and concentration are the two decisive steps that determine juice yield, product quality, and energy costs. The choice of equipment and process route directly impacts a factory's profit margin and product competitiveness.

This article systematically reviews the mainstream pressing equipment and concentration technologies used in fruit juice concentrate production, analysing each one's working principle, features, advantages, and disadvantages — helping industry professionals build a clear technical understanding.

Part I: Extraction amp; Pressing Equipment

Extraction and pressing is the "bottleneck" of the entire concentrate production line — its efficiency directly determines raw material utilisation (juice yield), while its method affects juice turbidity, nutritional content, and the difficulty of downstream processing.

The mainstream industrial pressing equipment can be categorised into six types:

1. Hydraulic Press — Represented by the Bucher HP

Working Principle

The hydraulic press employs a piston-cylinder system, using hydraulic pressure to drive a piston that applies high pressure to the fruit mash. Taking the HPX series from Swiss manufacturer Bucher Unipektin — one of the most widely used pressing machines in the global apple juice concentrate industry — as an example: between the piston and the cylinder base, 68 to 180 pressing elements (rope-type filter cores) are installed. After the fruit mash is fed into the centre of the press, the piston advances slowly, and juice flows out through the capillary channels of the pressing elements, while pomace is retained on the element surfaces.

A complete pressing cycle consists of: feeding → pre-pressing → loosening and turning → second pressing → pomace discharge. The Bucher HPX is equipped with a self-optimising control system that adjusts parameters in real time to maximise juice yield.

Key Parameters

Advantages

· Exceptionally high juice yield: 82%–93% is among the highest of all pressing equipment, particularly suited for pome fruits such as apples and pears

· Low juice turbidity: The pressing elements double as filters, yielding the lowest suspended solids (trub) content in the raw juice, reducing the load on downstream clarification

· Fully enclosed hygienic design: Minimises oxidation and microbial contamination risks

· Mature technology: Used by hundreds of factories worldwide, with well-established spare parts supply and technical support

· Flexibility: The same equipment can process apples, pears, berries, grapes, vegetables and other raw materials

Disadvantages

· Batch operation: The pressing process operates in batch cycles (feed–press–discharge), less continuous than belt presses or decanter centrifuges

· High capital investment: Large HPX models are expensive, creating a high barrier to entry for small and medium-scale factories

· Limited adaptability to berries: Berries (e.g., blueberries, strawberries) have high mash viscosity and fine seeds that can easily clog the pressing elements

Suitable Applications

Large-scale industrial production of apple/pear juice concentrate (daily processing capacity of 50+ tonnes), and front-end extraction for premium NFC juices demanding high yield and low turbidity.

2. Belt Press

Working Principle

The belt press uses two circulating filter belts (upper and lower) to sandwich the fruit mash layer, which travels between a series of pressing rollers with progressively decreasing diameters. The mash first passes through a gravity drainage zone where free juice filters out, then enters a wedge pre-pressing zone, and finally reaches a high-pressure shear zone where residual juice is squeezed out. The filter belts are continuously cleaned during operation, enabling continuous processing.

Key Parameters

Advantages

· Continuous operation: Capable of 24-hour uninterrupted feeding, pressing, and discharge, suitable for large-scale production lines

· High throughput: A single unit can reach up to 20 t/h, meeting the capacity demands of large factories

· High degree of automation: Automatic belt cleaning, PLC-controlled pressing pressure and belt speed, minimal manual intervention

· Strong adaptability: Belt speed adjustable via variable frequency drive to accommodate fruits of different maturity and varieties

· Relatively low capital investment: Lower procurement cost compared to large hydraulic presses

Disadvantages

· Lower juice yield than hydraulic press: Approximately 5%–15% lower, with higher moisture content in the pomace

· Higher juice turbidity: Larger belt pore size allows fine fruit particles to pass through, increasing downstream clarification burden

· Belt wear: Filter belts are consumables requiring periodic replacement (typically every 3–6 months), increasing maintenance costs

· Poor adaptability to high-viscosity mash: High-viscosity mashes such as mango and banana tend to clog the belts

Suitable Applications

Continuous pressing of apples, berries, tomatoes, etc. in medium-to-large juice factories; scenarios where ultimate juice yield is not critical but high throughput and low labour costs are prioritised.

3. Screw Press / Expeller Press

Working Principle

The core of the screw press is a rotating screw housed within a perforated cylindrical screen. After the fruit mash enters through the feed port, it is pushed forward by the rotating screw. In the compression section — where the pitch gradually narrows and the screw diameter gradually increases — pressure rises progressively, juice is extruded through the screen holes, and pomace is discharged from the tail end.

According to academic research (MDPI, 2019), the screw press achieves a juice yield of 61.9%–71.6% in apple juice extraction, and its stronger mechanical shear action can more thoroughly rupture cell membranes, releasing deeper-layer nutrients.

Advantages

· Simple structure, robust and durable: Few moving parts, low maintenance costs

· Higher nutritional indicators in juice: Research shows that juice from screw presses has higher soluble solids (°Brix), significantly higher total polyphenol content (TPC) than basket/hydraulic presses, and stronger antioxidant activity

· Slightly higher acidity: Lower pH, providing stronger natural antimicrobial properties

· Low oxidation rate: Apples are milled and pressed in-machine with short air exposure time

· Suitable for small-scale and farm-direct scenarios: Compact equipment, low investment threshold

Disadvantages

· Moderate juice yield: 61.9%–71.6%, lower than hydraulic presses (82%–93%) and belt presses (70%–80%)

· Over-crushing risk: For softer apple varieties, the screw may over-crush the fruit into very fine particles that clog the screen holes (0.4–0.5 mm), paradoxically reducing juice yield

· High suspended solids in juice: The shearing action forces more fine particles into the juice, resulting in higher turbidity

· Continuous but limited throughput: Single-unit processing capacity is typically lower than that of belt presses

Suitable Applications

Small-to-medium juice factories, farm-fresh juice production, functional juice manufacturing pursuing high polyphenol and high antioxidant indicators.

4. Decanter Centrifuge

Working Principle

The decanter centrifuge (horizontal screw-discharge settling centrifuge) uses centrifugal force generated by high-speed rotation to achieve solid-liquid separation. Its core components include the bowl, screw conveyor (scroll), differential gear, and drive system. After the fruit mash enters the bowl, it is subjected to a high-speed centrifugal field (typically 2,000–4,000 rpm). Heavier solids (pomace, seeds, skins) are thrown to the inner wall of the bowl forming a sediment layer, which is conveyed by the screw to the conical end for discharge; the lighter liquid phase (juice) forms an inner liquid ring and continuously overflows from the discharge ports.

Depending on the model, processing capacity ranges from 1,000 L/h (LW250) to 85,000 L/h (LW720W).

Advantages

· Truly continuous operation: Feeding, separation, and discharge occur simultaneously, enabling round-the-clock uninterrupted production

· High separation precision: Effectively removes pomace, seeds, skins, dark spots, fibres and other impurities

· Large throughput: Large models can reach 85,000 L/h, suitable for high-capacity factories

· Adaptable to high-fibre/high-viscosity materials: Outperforms belt presses on high-fibre mashes such as mango and carrot

· Small footprint: Compact structure, significantly saving space compared to traditional plate-and-frame filtration

· CIP capability: Some models are equipped with CIP (Clean-in-Place) systems, reducing cross-contamination risks

· Low-temperature separation: Can operate under temperature-controlled conditions without damaging heat-sensitive nutrients, particularly suitable for NFC cold-pressed juices

Disadvantages

· Lower juice yield than hydraulic press: Centrifugal separation relies primarily on density differences, achieving lower recovery of soluble solids compared to high-pressure pressing

· Juice clarity depends on operating parameters: Speed, differential speed, overflow weir depth and other parameters require fine-tuning

· Higher equipment and maintenance costs: High-speed rotating components demand high-quality bearings and dynamic balancing

· Higher energy consumption: Motor power for high-speed rotation ranges from 11 kW to 110 kW

Suitable Applications

Coarse filtration and de-pomacing in large juice factories, low-temperature clarification of NFC cold-pressed juices, pre-treatment for fruit wines and fermented beverages, solid-liquid separation of plant extracts.

5. Pneumatic / Membrane Press

Working Principle

The pneumatic press houses a rubber bladder inside a rotating horizontal cylinder. After the fruit mash is loaded, the cylinder rotates slowly to distribute the material evenly, then compressed air (typically 0.2–0.6 MPa) is introduced into the bladder. The bladder expands, applying gentle and uniform radial pressure to the mash, and juice flows out through the perforations on the cylinder's inner wall. One cycle includes multiple sequences of "pressurise and press → depressurise and loosen → rotate and turn → re-press."

Advantages

· Gentle pressing: The bladder's elastic material applies mild pressure to the mash, without crushing stems and seeds, yielding high-quality juice with minimal release of bitter/astringent compounds

· Good juice yield: Achieves relatively high juice yield at lower pressures, suitable for multiple-cycle pressing

· Free-run juice separation: During the pre-pressing rotation, free-run juice separates naturally, potentially replacing a dedicated juice separator

· Inert gas capability: Some premium models can fill the bladder with nitrogen, enabling oxygen-free pressing to prevent oxidation, particularly suitable for heat-sensitive berries

· Full stainless steel, PLC-controlled: High hygiene rating, good automation level

Disadvantages

· Batch operation: Batch cycling, with capacity limited by single-load volume

· Moderate throughput: Single units are typically suited for small-to-medium scale (wineries, boutique juice factories)

· Bladder is a consumable: Rubber bladders have a limited service life (typically 2–3 years), with relatively high replacement costs

· Less efficient than hydraulic press for pome fruits: Lower juice yield than the Bucher HPX on hard fruits such as apples

Suitable Applications

Wineries, boutique berry juice production (blueberry, cranberry, blackcurrant), premium NFC juices, and anthocyanin-rich juices requiring oxygen-free protection (dragon fruit, grape).

6. Screw Press + Enzymatic Treatment (Combined Process)

This is a process combination rather than a single piece of equipment, but it is extremely common in the concentrate juice industry and warrants separate discussion.

Process Flow

1. Fruit is crushed and enters the mash tank

2. Pectinase and cellulase are added; enzymatic hydrolysis proceeds at 45–55°C for 30–60 minutes

3. Pectin is decomposed, reducing mash viscosity

4. The enzyme-treated mash enters a screw or belt press

Advantages

· Significantly increases juice yield: Pectin decomposition rate can reach 90%, boosting juice yield from 55% to over 80%

· Reduces juice viscosity: Facilitates downstream ultrafiltration and evaporative concentration

· Improves raw material utilisation: More juice is extracted from the same quantity of fruit

Disadvantages

· Additional process steps and costs: Enzyme costs, mash tank investment, and thermal energy for temperature maintenance

· Requires precise enzymatic condition control: Temperature, time, and pH must be carefully controlled; over-enzyming may affect juice flavour

· Food safety compliance: Enzyme preparations must meet food-grade standards (GB 1886.174 / FDA GRAS)

Extraction Equipment Comparison

Part II: Clarification amp; Filtration

The raw juice obtained from pressing contains large amounts of suspended solids, pectin, proteins, and microorganisms, and must undergo clarification before entering the concentration stage. Mainstream technologies include:

1. Enzyme Treatment + Gelatin/Silica Clarification (Traditional Process)

Pectinase is added to the raw juice to decompose soluble pectin, followed by gelatin and silica sol to adsorb suspended matter. After settling, the clear supernatant is separated. This is the most traditional clarification method — mature in process and low in cost — but time-consuming (6–12 hours) and demanding on batch-to-batch consistency.

2. Ultrafiltration (UF)

Ultrafiltration uses semi-permeable membranes with pore sizes of 1–100 nm, driven by pressure to separate suspended solids, colloids, microorganisms, and enzymes from the juice, while allowing small molecules such as sugars, acids, and vitamins to pass through.

Advantages

· Continuous and automated: No settling time required, significantly shortening the production cycle

· High juice clarity: Turbidity can be reduced to <1 NTU

· Preserves flavour compounds: Low retention of soluble solids such as fructose and organic acids, maintaining good flavour

· No clarifying agents required: Reduces the use of chemical additives

Disadvantages

· Membrane fouling: High-molecular-weight substances such as pectin form a gel layer on the membrane surface, causing permeate flux to decline continuously

· Enzymatic pre-treatment required: For pectin-rich juices such as citrus, enzymatic hydrolysis to reduce viscosity is mandatory before UF, otherwise membrane fouling is severe

· Membrane cleaning and replacement costs: Periodic chemical cleaning and membrane replacement are major operating costs

· Stringent optimal operating conditions: For apple juice UF, the optimal conditions are transmembrane pressure (TMP) 2.0 bar, cross-flow velocity (CFV) 2.5 m/s, temperature 50°C

3. Microfiltration (MF)

Microfiltration has larger pore sizes (0.1–10 μm) than ultrafiltration and is primarily used to remove suspended solids and reduce turbidity, typically serving as a pre-treatment step for ultrafiltration or reverse osmosis.

Membrane Filtration Technology Spectrum

Integrated membrane process route: MF (microfiltration) → UF (ultrafiltration) → RO (reverse osmosis) / MD (membrane distillation). MF/UF handle clarification, RO performs pre-concentration, and MD completes high-fold concentration. This route maximises the retention of the juice's original colour, aroma, flavour, and nutritional components.

Part III: Concentration Technologies

Concentration is the final and most critical step in concentrate production — raising the juice's °Brix from approximately 12° to 65–70° while preserving flavour, aroma, and nutrition as much as possible. Three main concentration technology routes are currently used in industry.

1. Multiple Effect Evaporator (MEE)

Working Principle

Multiple effect evaporation exploits the cascade utilisation of secondary vapour: the secondary vapour generated by the first effect evaporator is not sent to the condenser, but is used as the heating medium for the second effect evaporator; the second effect's secondary vapour is then used for the third effect... and so on. Each additional effect reduces fresh steam consumption by approximately one "effect" equivalent.

A typical configuration is a three-effect or five-effect falling-film evaporator, with the first effect heating temperature at approximately 85–95°C and the final effect evaporating at approximately 50–60°C under vacuum. An aroma recovery unit is often integrated, separating volatile aroma compounds before evaporation and re-adding them after concentration.

Advantages

· Mature and reliable process: The standard equipment of the concentrate juice industry for decades

· Can achieve 70°Brix+ concentration

· Aroma recovery: Integrated units can separate and re-add aroma compounds, ensuring product flavour

· Wide applicability: Suitable for virtually all juice varieties

Disadvantages

· Thermal damage: High-temperature evaporation degrades heat-sensitive components such as vitamin C and anthocyanins

· Flavour changes: May produce "cooked flavour"; Maillard reaction causes colour deepening

· High energy consumption: Large fresh steam consumption; equipment investment rises significantly with increasing number of effects

· High cooling water consumption: The final effect vapour requires large volumes of cooling water for condensation

Suitable Applications

Traditional large-scale concentrate juice production (apple juice concentrate, orange juice concentrate), for factories where ultimate flavour preservation is not critical and cost control is the primary driver.

2. Mechanical Vapour Recompression Evaporator (MVR)

Working Principle

MVR technology uses a mechanical compressor (typically a high-pressure fan or centrifugal compressor) to compress the secondary vapour generated by the evaporator, raising its temperature and pressure before returning it to the evaporator as a heating medium. In essence, it uses a small amount of electrical energy to drive the compressor, "upgrading" low-grade vapour into a high-grade heat source, forming a closed-loop cycle.

Under vacuum conditions, the evaporation temperature can be controlled within the low-temperature range of 50–70°C, combined with a falling-film evaporator for single-pass concentration.

Advantages

· Exceptional energy efficiency: Theoretically saves 50%–80% energy consumption compared to multi-effect evaporation, and saves 90% cooling water

· Virtually no fresh steam required: After system start-up, only a small amount of electricity is needed to drive the compressor

· Low-temperature evaporation: Protects heat-sensitive components, reducing "cooked flavour" and colour degradation

· Short residence time: Single-pass falling-film design, minimising material heat exposure

· Fully automated: Integrated SCADA system, supporting remote monitoring and diagnostics

· Modular compact design: Small footprint, suitable for new builds or retrofit projects

· CIP capability: Fully automatic cleaning, reducing downtime

Disadvantages

· High equipment investment: The high-pressure fan/compressor is the core high-value component, with initial investment higher than MEE

· Electricity dependency: In regions with high electricity prices, the economic advantage may be diminished; in regions with low electricity prices or green power availability, the ROI is excellent

· High compressor maintenance requirements: High-speed rotating components require regular professional maintenance

· Typically requires back-end support: After MVR concentration, a TVR or forced-circulation evaporator may still be needed for final concentration or crystallisation control

Suitable Applications

New large-scale concentrate juice factories, modern production lines pursuing ultimate energy efficiency and low carbon emissions, and factories in regions with low electricity costs. This is currently the lowest-energy evaporative concentration technology in industrial use.

3. Membrane Concentration (RO + MD)

Working Principle

Membrane concentration does not rely on thermal evaporation, but instead uses pressure to drive water molecules through a semi-permeable membrane to achieve dewatering and concentration.

· Reverse osmosis (RO): Uses a dense hydrophilic membrane to separate water from juice under high pressure (20–60 bar), pre-concentrating juice to 20–30°Brix

· Membrane distillation (MD): A thermally driven process using the vapour pressure difference across a hydrophobic microporous membrane to drive water vapour transfer, capable of concentrating juice up to 60°Brix

Advantages

· Low-temperature operation: No heating or minimal heating, maximising retention of colour, aroma, flavour, and nutritional components (vitamin C and anthocyanin retention rates exceed 98%)

· No phase change: Water passes through the membrane at the molecular level without undergoing liquid-to-gas phase transition, resulting in high energy utilisation efficiency

· Exceptional product quality: Suitable for concentrating premium NFC juices and functional juices

· Modular: Membrane modules can be flexibly added or removed, facilitating capacity expansion

Disadvantages

· Limited concentration degree: RO alone cannot reach 60°Brix due to osmotic pressure limitations; integration with MD is required for high-fold concentration

· Severe membrane fouling: Pectin, proteins, polyphenols and other substances in the juice readily foul membrane surfaces, causing flux decline

· High membrane cleaning and replacement costs: Frequent chemical cleaning required, limited membrane lifespan (1–3 years)

· Limited large-scale application to date: Membrane distillation technology is still in the industrial promotion stage, with maturity and capacity lower than evaporation

· High investment cost: Combined investment in high-pressure pumps, membrane modules, and control systems is substantial

Suitable Applications

Premium juices (NFC, cold-pressed, functional), products with extremely high requirements for heat-sensitive component retention, laboratory/pilot-scale concentration, and pre-concentration integrated with evaporative concentration.

Concentration Technology Comparison

Part IV: Process Route Selection

Based on the above analysis, the process route selection for a concentrate juice factory should be determined by product positioning, capacity scale, raw material characteristics, and investment budget:

Route A: Traditional Large-Scale Apple Juice Concentrate

Hydraulic press (Bucher HPX) → Enzyme treatment + ultrafiltration (UF) → Three/five-effect falling-film evaporation (MEE) + aroma recovery

Characteristics: Mature and reliable, high juice yield, low unit cost — the mainstream route for the world's major apple juice concentrate exporting nations (China, Poland, USA).

Route B: Modern Large-Scale Concentrate Juice Plant

Belt press / decanter centrifuge → Ultrafiltration (UF) → MVR evaporation

Characteristics: Highest degree of continuous operation, lowest energy consumption, highest automation level — suitable for new factories and enterprises with carbon neutrality goals.

Route C: Premium NFC / Functional Juice

Pneumatic press (oxygen-free) → Microfiltration (MF) → Ultrafiltration (UF) → Reverse osmosis (RO) pre-concentration → Membrane distillation (MD)

Characteristics: Fully low-temperature, maximising nutritional and flavour retention, delivering the highest product quality — but also the highest unit cost, suitable for high-value-added products.

Route D: Small-to-Medium Scale / Farm Direct

Screw press (+ enzymatic treatment) → Traditional clarification → Single/double-effect evaporation

Characteristics: Low investment threshold, simple equipment, high flexibility — suitable for small-to-medium factories or farm-owned brands.

Conclusion

The production of fruit juice concentrate is far more sophisticated than simply "squeeze and boil." From hydraulic presses to decanter centrifuges, from multi-effect evaporation to MVR and membrane concentration, each equipment and process has its specific strengths and unavoidable limitations. The best juice plants do not blindly pursue the "most advanced" — they choose the optimal combination based on product positioning, raw material supply, capacity planning, and investment budget.

The future trends are clear: lower temperatures, continuous operation, intelligent control, and decarbonisation. The penetration rate of MVR evaporation and membrane technology will continue to rise, while digital tools such as predictive maintenance and digital twins are making this traditional production line increasingly "smart."

Need help selecting the right equipment and process route for your juice concentrate project? Contact us today for a tailored technical consultation.

References

1. Bucher Unipektin — HPX Presses technical data: https://www.bucherunipektin.com/bucher-hpx-presses

2. IBC MACHINE — Decanter Centrifuge Separator specifications: https://fruitprocessingmachine.com/portfolio-items/decanter/

3. AllCentrifuges — Decanter Centrifuges in Juice and Plant Extraction (2025): https://www.allcentrifuges.com/new-opportunities-for-the-application-of-decanter-centrifuges-in-juice-and-plant-extraction/

4. MDPI Sustainability — Effect of Press Construction on Yield and Quality of Apple Juice (2019): https://www.mdpi.com/2071-1050/11/13/3630

5. ScienceDirect — Fruit juice processing using membrane technology: A review: https://www.sciencedirect.com/science/article/pii/S1466856417304204

6. Springer — Recent Developments of Membrane Technology in the Food Industry (2023): https://link.springer.com/article/10.1007/s12393-023-09346-2

7. SPX FLOW / Anhydro — MVR Evaporators technical data: https://www.spxflow.com/anhydro/products/mechanical-vapor-recompression-mvr-evaporators/

8. LH Evaporator — Comparison of MEE, TVR & MVR (2026): https://www.lhevaporator.com/discover/news/comparison-of-three-evaporation-concentration-technologies-mee-tvr-mvr

9. Zhihu — Giant presses: Unlocking the "industrial revolution" behind a glass of juice (2025): https://zhuanlan.zhihu.com/p/1986819978821914823

10. China Food Machinery Network (foodjx.com) — Belt press filter technical data: https://www.foodjx.com/chanpin/4901157.html

11. Jiangsu Kaayi Technology — Pneumatic juice press product data: https://kaae.cn/product/zzxl26.html

12. HYF Machinery — Apple Juice Concentrate Production Line: https://www.hyfmachinery.com/Apple-juice-concentrate-production-line.html