Efficient and Smart · Freshness Preservation —— Juice and Jam Production Line

In today's rapidly upgrading food processing industry, juice and jam have become popular categories in the consumer market due to their natural and healthy attributes. An efficient, stable, and intelligent juice and jam production line is the core support for achieving large-scale, standardized production while locking in the natural flavor and nutrition of fruits. The Jinzong juice and jam production line is an automated equipment system integrating raw material handling, processing and refining, sterilization and freshness preservation, as well as filling and packaging. It is applicable to a variety of fruit and vegetable materials such as strawberries, blueberries, yellow peaches, apples, and tomatoes. The line flexibly produces clear juice, cloudy juice, puree, concentrate, and various jam products. Widely used in food processing plants, beverage companies, and fruit and vegetable deep-processing bases, it balances production efficiency with product quality, helping enterprises achieve large-scale production and product upgrading.

I. Core Structure of the Production Line

The juice and jam production line adopts a modular design, with equipment in each stage closely connected and operating synergistically. It can be divided into five core systems, each equipped with specialized machinery to ensure a smooth and efficient production process while meeting food hygiene and safety standards.

(A) Raw Material Pre-treatment System

As the foundational stage of production, this system is primarily responsible for cleaning, grading, and initial processing of fruit and vegetable raw materials, removing impurities and inedible parts to lay the groundwork for subsequent processing. Core equipment includes:

• Elevating and Grading Equipment: Elevators convey raw materials to the processing stage. Graders sort materials by size, color, and maturity for precise downstream processing, while also culling defective or diseased produce to improve raw material utilization rate and product consistency.

• Washing Equipment: Mainstream methods include bubble washing machines or brush-spray fruit washers. Utilizing high-pressure spraying, brush scrubbing, or bubble tumbling principles, they thoroughly remove sediment, pesticide residues, and impurities from the fruit and vegetable surfaces. Wastewater is discharged in real-time to ensure raw material cleanliness. Some units also feature centrifugal dewatering to reduce moisture interference in subsequent processes.

• Specialized Pre-treatment Equipment: Depending on the raw material characteristics, equipment such as peelers, pitters, and dicers are used. For example, pitters efficiently remove pits from stone fruits like hawthorn and dates; peelers handle the skin of fruits like apples and pears; dicers cut fruits and vegetables into uniform small pieces, facilitating subsequent juicing or pulping. This significantly enhances processing efficiency, replacing manual operations and reducing costs.

(B) Core Processing System

This system is critical in determining final product quality. Its core function is to transform pre-treated fruits and vegetables into juice or jam semi-finished products. Equipment configuration is flexibly adjusted according to the target product type. Core equipment includes:

• Juicing and Pulping Equipment: For juice production, equipment like pneumatic bag presses or screw juicers extract juice through pressing or grinding, maximizing nutrient and flavor retention, with juice yield reaching over 75%. For jam production, pulpers are used to crush fruit pieces into a fine pulp. Multiple pulpers can be used in series to enhance production efficiency and pulp fineness.

• Enzymolysis and Separation Equipment: Some juice production lines require enzymolysis tanks where enzymes are added to break down pectin and cellulose, improving juice yield and clarity. Subsequently, equipment like decanter centrifuges or ultrafiltration systems separate fruit pulp residues and impurities to obtain clear juice. Jam production typically omits this separation stage, proceeding directly to cooking and concentration.

• Concentration Equipment: For concentrate and jam production, vacuum concentration tanks or forced circulation vacuum evaporators are used. They utilize a low-temperature, high-vacuum environment to rapidly evaporate moisture from the material, preventing high temperatures from damaging nutrients and flavor. Forced circulation evaporators are suitable for high-viscosity materials, preventing "burn-on" or scaling. The concentration level is adjustable, with juice concentrate typically reaching 30-65 Brix and jam soluble solids content reaching 11-15 Brix or higher.

• Cooking and Homogenization Equipment: Jam production utilizes specialized cooking kettles for heating, stirring, and seasoning, allowing precise control over cooking temperature and time to ensure a viscous texture and uniform color. Homogenizers are used for refining juice or jam, breaking down particles to create a smoother, more stable product and preventing stratification.

(C) Controllable Quality, Preserving Natural Flavor and Safety

All equipment is constructed from 304 stainless steel. Surfaces contacting the material are designed without dead corners, complying with food-grade hygiene standards and effectively preventing material contamination. Core processing stages utilize low-temperature concentration and low-temperature sterilization technologies to maximize the retention of nutrients such as vitamins and minerals, while locking in natural color and flavor, ensuring pure taste and vibrant appearance. Furthermore, the production line is equipped with a comprehensive quality monitoring system that allows real-time parameter tracking (e.g., material temperature, concentration, sterilization effectiveness), ensuring consistent quality across every batch. The合格率 (pass rate) can reach over 98%, complying with national food safety production standards.

(D) High Efficiency, Energy Saving, and Environmentally Friendly

The equipment incorporates advanced energy-saving technologies. For instance, the vacuum concentration system efficiently utilizes heat energy, resulting in low steam consumption and high heat utilization. The water treatment system enables water recycling, reducing water waste. Waste treatment equipment allows for the recovery and reuse of by-products like peels and cores (e.g., for producing animal feed or organic fertilizer), minimizing environmental pollution. Additionally, the equipment operates with low noise and low energy consumption, effectively reducing long-term operational costs for enterprises and enabling green, sustainable production.

(E) Easy Operation, Easy Maintenance, High Stability

The production line features a user-friendly design. The control panel is simple to operate, requiring no specialized technical personnel for quick mastery. The equipment has a reasonable structure with an integrated cleaning system, facilitating daily cleaning and maintenance and reducing the incidence of equipment failure. Core components are manufactured from high-quality materials using advanced techniques, offering wear resistance, corrosion resistance, stable operation, and a long service life. This effectively lowers equipment maintenance costs, ensures continuous and stable production, and minimizes losses from production interruptions.

III. Working Principle of the Production Line

The core working principle of the juice and jam production line is "physical processing + sterilization and freshness preservation." Through the coordinated operation of all system equipment, fresh fruits and vegetables are transformed into juice or jam products suitable for long-term storage and convenient transportation. The overall workflow is clear, with each stage interlinked. The specific principles are as follows:

(A) Raw Material Pre-treatment Stage: Cleaning and Grading, Laying the Foundation

Fresh fruit and vegetable raw materials are conveyed by an elevator to a grader. They are sorted by size, color, and maturity, with defective and diseased fruits removed. Subsequently, they enter washing equipment where high-pressure spraying, brush scrubbing, or bubble tumbling removes surface sediment, pesticide residues, and impurities. After washing and dewatering, the materials proceed to peeling, pitting, and dicing equipment. Here, inedible parts are removed, and the material is cut into uniform small pieces, preparing it for subsequent juicing or pulping. The core purpose of this stage is to clean the raw materials and improve utilization rate, ensuring the stability of subsequent processing and final product quality.

(B) Core Processing Stage: Extraction and Refining, Shaping Quality

1. Juice Processing Principle: The diced fruits and vegetables enter a juicer. Through physical actions like pressing and grinding, the juice is separated from the pulp, yielding crude juice. This crude juice may be treated in an enzymolysis tank to break down pectin and cellulose, improving juice yield and clarity. Subsequently, separation equipment removes residual solids and impurities to obtain clear juice. To produce concentrate, the clear juice enters vacuum concentration equipment. In a low-temperature, high-vacuum environment, water is rapidly evaporated based on the principle of vaporization, increasing the juice concentration. After concentration, concentrated juice is obtained. Finally, a homogenizer refines the juice particles, enhancing mouthfeel and stability, and preventing stratification.

2. Jam Processing Principle: The diced fruits and vegetables enter a pulper, where they are processed into a fine pulp. This pulp then enters a cooking kettle. Here, ingredients like sugar and acidity regulators are added. Through heating and stirring, water in the pulp evaporates, sugar dissolves, and some microorganisms are inactivated, causing the pulp to thicken. To enhance jam quality, a homogenizer can be used to further refine the pulp particles, ensuring a smooth texture. For jams requiring concentration, vacuum concentration equipment adjusts the soluble solids content to meet the specified standard, completing the jam refining process.

(C) Sterilization and Freshness Preservation Stage: Inactivating Microorganisms, Extending Shelf Life

The refined juice or jam is conveyed through pipelines to sterilization equipment. The appropriate sterilization method is selected based on the product type:

• Thermal Sterilization: The product is heated to a specified temperature (e.g., pasteurization at 70-85°C, UHT at 120-135°C) and held for a set time to inactivate bacteria, molds, yeasts, and enzymes present in the material, preventing spoilage.

• High-Pressure Sterilization: In a high-pressure environment, the cellular structure of microorganisms is directly disrupted to achieve sterilization without the need for high temperatures, thus preserving the natural nutrients and flavor of the product.

After sterilization, a deaerator removes air from the product to prevent oxidative browning and further enhance stability.

(D) Filling and Packaging Stage: Standardized Encapsulation, Facilitating Storage and Transport

The sterilized juice or jam is cooled to ambient temperature and conveyed to a filling machine. According to preset parameters, the filler accurately dispenses the product into specified packaging containers (e.g., glass bottles, PET bottles, aseptic bags). The containers are then sealed by a sealing machine to ensure package integrity, preventing leakage and contamination. Sealed products proceed to a labeller for label application, and a laser coder prints information such as the production date, shelf life, and batch number. Finally, the products are packed using case packers and case sealers, and automatically palletized by a palletizer. This completes the entire production process, with the packed products ready for warehousing and transportation, enabling large-scale distribution.