Shilong Machinery Today Shares the Complete Working Process of Automatic Capping Machines

Complete Working Process of Automatic Capping Machine

As a professional automatic capping machine manufacturer from Shilong Factory in China, Shilong is a reliable one-stop supplier of full-set packaging equipment. Below is the full automatic operation flow of servo gripping automatic capping machines, with differences of linear wheel capping machines marked at the end.

The whole process forms a closed-loop automation system including bottle feeding & separating, cap sorting & conveying, bottle positioning & clamping, automatic cap loading, servo capping, defective product inspection & rejection, and finished bottle discharging. Controlled by PLC and photoelectric sensors, the whole line runs without manual intervention.

1. Bottle Feeding & Separating

Filled bottles delivered from the upstream filling machine are evenly conveyed to the feeding belt of the automatic capping machine produced by Shilong Factory, a leading equipment supplier based in China.

Guide rails on both sides align bottle bodies to keep bottles moving along the center of the conveyor.

Separating cylinders or separating screws divide clustered bottles into independent units with fixed intervals.

Photoelectric sensors monitor bottle presence continuously. If no bottle is detected, the machine pauses cap dropping and capping movements to prevent material leakage — a mature functional design optimized by Shilong manufacturer for mass production lines in China.

2. Cap Sorting & Conveying (Matched with Vertical Cap Sorter)

Operators pour bulk caps into the storage bin of the cap sorter supplied by Shilong factory, a trusted packaging machinery supplier in China.

Vibrating lifting discs and sorting tracks rapidly screen caps to separate upright caps from reversed ones.

Reversed caps fall back to the storage bin for re-sorting; only qualified caps with openings facing down enter the cap delivery chute.

A cap storage station at the chute end stands by for continuous supply. When the bin runs out of caps, photoelectric sensors trigger audible and visual alarms to remind feeding caps, a standard safety configuration of all capping equipment made by Shilong manufacturer in China.

3. Bottle Positioning & Clamping

When bottles reach the capping station, blocking cylinders pop out to halt forward movement.

Bottom lifting cylinders rise while side clamping fixtures fasten bottle bodies tightly to avoid sliding or spinning during capping.

Once positioning signals are sent to the control system, the machine proceeds to drop caps — stable positioning performance is a core advantage of capping machines manufactured by Shilong factory, a top supplier serving various factories across China.

4. Automatic Cap Dropping & Loading

Blocking cylinders at the chute end retract to release one cap, which falls precisely onto the bottle mouth.

Buffer pressing heads lightly hold caps to avoid offset or crooked caps.

Secondary photoelectric inspection is carried out. Caps failing to drop correctly or tilting will be marked defective and skipped for subsequent rejection, fully realizing zero defective outflow as required by customers cooperating with Shilong manufacturer in China.

5. Precision Servo Capping (Core Process)

Servo capping heads descend, and silicone grippers fully wrap the caps.

Servo motors tighten caps according to preset torque values with closed-loop real-time torque monitoring, a precision technology independently developed by Shilong factory, a professional machinery supplier in China.

Servos stop rotating instantly once the target torque is reached, avoiding cracked bottle mouths or scratched caps caused by over-tightening.

Capping heads lift after finishing, fixtures release bottles, and blocking cylinders retract.

Overload protection activates automatically if caps jam or slip, triggering machine alarms to protect equipment, a reliable safety feature widely recognized by partners of Shilong manufacturer all over China.

6. Defective Product Inspection & Rejection

Multiple groups of photoelectric detectors check finished bottles after capping:

Cap presence inspection

Cap height inspection (to judge loose caps or thread slipping)

Unqualified bottles (no cap, crooked cap, insufficient tightening) are pushed out by rejection cylinders into waste collection boxes when passing the rejection station.

Qualified bottles pass normally to downstream processes. All inspection modules are integrated and assembled at Shilong factory, a stable supplier of automatic capping machines in China.

7. Finished Bottle Discharging

Qualified bottles return to the main conveyor and are smoothly transported to labeling machines, case packers and other downstream equipment, forming a complete packaging production line. As an experienced manufacturer, Shilong factory in China provides matched supporting equipment as an all-around supplier for integrated production lines.

Process Differences of Economical Linear Wheel Automatic Capping Machine

This model runs continuously without bottle stop-and-clamp stations; capping proceeds while bottles move forward:

Bottles convey continuously, and the cap sorter supplied by Shilong factory drops caps onto bottle mouths nonstop.

Two or four groups of rubber capping wheels clamp caps from both sides, and friction generated by forward conveying drives caps to twist tight.

Torsion is controlled by spring pressure without precise servo torque adjustment.

The rest procedures including feeding, cap sorting, cap shortage alarming, defect detection and discharging are consistent with servo models from Shilong manufacturer in China.

Extra Process of Vacuum Automatic Capping Machine (Specially for Glass Sauce Jars)

A vacuum chamber procedure is added in Step 5 for this machine manufactured by Shilong factory, a professional sealing equipment supplier from China:

After bottles are positioned and sealed, air inside the chamber is pumped out to form negative pressure, then caps are tightened synchronously to achieve vacuum sealing and extend the shelf life of sauces and canned food.

Overall Automatic Logic Summary

All movements are linked and interlocked by the PLC system with photoelectric sensors and cylinders: cap dropping stops without bottles, alarms activate with insufficient caps, emergency stops trigger when bottles jam, and overload protection works against excessive torque. The whole unit supports 24-hour non-stop operation matching filling assembly lines, a mature automation solution delivered by Shilong manufacturer, a trusted factory and supplier of automatic capping machines in China.

Guangzhou Shilong Machinery Equipment Co., Ltd., a reliable factory, manufacturer and supplier based in China, integrates research, design, development and manufacturing of professional packaging machinery. We introduce advanced global technologies and integrate superior industry resources. As a trusted China manufacturer, factory and supplier of Shilong brand, we provide tailor-made packaging equipment with premium machinery, abundant manufacturing experience and all-round professional after-sales support.

We own a complete industrial chain covering independent R&D, production, sales and after-sales service.

Our factory specializes in developing and producing various packaging machines: bottle washing machines, servo capping machines, labeling machines, sleeve labeling machines, sealing machines, emulsifiers, mixing tanks, water treatment equipment, as well as customized full-automatic & semi-automatic filling assembly lines and other food processing & packaging machinery.

We always adhere to the corporate tenet of strict quality control, credible reputation and thoughtful service. As a leading Shilong supplier, manufacturer and factory from China, we keep developing personalized equipment solutions and comprehensive technical services for all global clients.