Technical analysis of making machine for crystal agar ball production line for popping boba

Agar crystal balls and popping beads are made from ingredients such as water, high-fructose corn syrup, granulated sugar, konjac powder, carrageenan, and sodium alginate. The ingredients are uniformly mixed through rehydration in a colloid mill, then heated and simmered to fully dissolve the colloid. During the heating and melting process with calcium solution, a gel structure forms through the cross-linking reaction between calcium ions and sodium alginate, and the crystal balls are shaped under vacuum.
Zhengzhou Zhenyan Machinery Equipment Co., Ltd. can design, manufacture, install, and commission agar crystal ball production line equipment, water chestnut popping bobaproduction line machinery, and popping bobaforming machines according to customer requirements.

 I. Main Components of the Agar Crystal Ball Production Line

The agar crystal ball production line is key to the industrial-scale production of popping pearls. Its main systems include modules for raw material processing, forming, sterilization, and packaging. The line typically features a fully automated design that combines food-grade materials with an intelligent control system. The following outlines the main equipment components and technical features:


1. Fully Automated Production Line
System Components: Includes a water treatment system, juice blending system, agar solution blending system, droplet forming system, cleaning and curing system, sterilization system, and packaging and inkjet coding system.

Key Technologies:
PLC Control System: Utilizes a PLC programmer paired with a touchscreen HMI to achieve fully automated operation throughout the entire process.

Forming Technology: Juice is dispensed through nozzles into a sodium alginate solution, where calcium ions trigger a cross-linking reaction to form a thin film (forward spherulation) or to encapsulate a solid core material (such as water chestnut cubes).

Recirculating Water Cooling System: The system employs a shared cooling unit for multiple pieces of equipment, reducing the footprint and increasing production capacity.

Technical Specifications:
Production Capacity: 100–600 kg/h (customizable); Dosing Speed: 15–30 cycles/minute;
Product Size: 5–25 mm in diameter (adjustable).


2. Semi-Automatic and Laboratory Equipment
Suitable for small-scale production or R&D, with a production capacity of 0.2–0.5 T/h. Offers high flexibility and supports formula optimization.

Key equipment includes small colloid mills, vertical jacketed kettles (with agitators), and simplified molding units. These offer lower costs but require manual assistance during operation.


3. Specially Customized Models
For solid fillings (such as water chestnuts or red beans) or special shapes (hemispherical, irregular), adjustments to nozzle size and process flow are required—for example, using reverse spheronization technology or customized cooling systems.

II. Key Technologies of Agar Bead Forming Machines
The forming machine is the core equipment of the production line and directly affects the product’s shape, texture, and stability:


1. Classification of Forming Processes
Forward Spheronization: Juice is dripped into a sodium alginate solution containing calcium ions to form a thin, crisp outer membrane (0.1–0.3 mm thick), suitable for products with liquid fillings.

Reverse Spheronization: Used for solid core materials (such as water chestnut cubes), this process first coats the core with a starch layer containing calcium lactate, then immerses it in a sodium alginate solution to form a thick membrane (0.5 mm or more), thereby enhancing shelf life.


2. Molding Unit Configuration
Dispensing System: Uses copper nozzles (stainless steel is prone to wear); dispensing speed is 15–25 cycles per minute, with support for multi-size adjustments.

Circulating Water System: Rapid cooling and setting are achieved through cooling water holes and a Teflon filter screen to prevent sticking.

Materials and Safety: The entire machine is constructed of 304 stainless steel; electrical components are waterproofed and comply with food GMP and HACCP certifications.


3. Key Standalone Equipment
Colloid Mill: Used to dissolve sodium alginate; model JM-L50; emulsification fineness 2–50 μm; processing capacity 0.2–0.5 T/h.

Vertical Jacketed Kettle: Capacity 400 L; steam or electric heating; used for boiling jam and gelling solutions.

Transfer Pump: Flow rate 3.3 m³/h, made of 304 stainless steel, ensuring stable transfer of liquid raw materials.


III. Production Process and Directions for Technical Optimization

1. Standard Production Process
Raw Material Formulation: Fruit juice liquid (containing calcium lactate, concentrated fruit juice, etc.) is mixed with sodium alginate solution in the specified ratio.

Molding and Setting: A calcium ion solution is dripped through a pouring head to form a film, which is then washed and sterilized.

Packaging and Storage: Soaked in a preservative solution (water and fructose) to extend shelf life and prevent sticking.


2. Trends in Technological Innovation
Smart Upgrades: IoT sensors monitor parameters such as pH and temperature in real time to improve quality consistency.

Eco-Friendly Design: Wastewater recycling systems and biodegradable packaging materials reduce resource waste.

Functional Expansion: The addition of functional ingredients such as probiotics and dietary fiber caters to health-conscious consumer demands.
IV. Application Areas and Market Prospects

Thanks to their chewy texture and diverse flavors, agar crystals are widely used in:
Beverage Industry: As additives in bubble tea, yogurt, and ice cream, where they must withstand fluctuations in temperature.
Baking and Desserts: Cake decorations and tart fillings, requiring vibrant colors and resistance to deformation.
Prepackaged Foods: Individually packaged, ready-to-eat pearls, expanding into the snack market.

Future development directions include improving solid filling technology, reducing sugar content, and developing natural colorant alternatives to address homogenized competition and growing health demands.