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CNC VINA automatic ultrasonic plastic strapping machine is designed to automate the process of bundling or securing products with plastic strapping. The machine performs feeding, guiding, tensioning, cutting, and ultrasonic sealing according to a preset control sequence. Its drive system, pneumatic components, sensors, and controller work together to coordinate the strapping process. This solution reduces manual handling, helps maintain consistent strap positioning, and standardizes packaging operations. CNC VINA customizes the strap feeding mechanism, guide path, tensioning force, and sealing unit to suit product dimensions, strapping material, and actual operating requirements.

What is an automatic ultrasonic plastic strapping machine?

An automatic ultrasonic plastic strapping machine uses feeding and guiding mechanisms to wrap plastic strapping around a product, apply tension, cut the strap, and join its ends using ultrasonic sealing technology. The machine performs these operations according to a preset cycle, making it suitable for packaging applications that require consistent strap positioning and repeatable operation. Unlike manual strapping methods, the machine integrates multiple operations into a single system. The operator positions the product in the working area, while the machine carries out the strapping sequence according to the configured program. Depending on production requirements, the guide mechanism, tensioning force, and sealing parameters can be adjusted to suit different products.

Machine structure and main functional units

Strap feeding unit

The strapping material is mounted on a supply reel and fed into the guide mechanism. The system uses a strap-feeding motor, strap detection sensors, and an intermediate strap buffer to maintain a consistent supply before each operating cycle.

Strap guiding and wrapping unit

The guide mechanism directs the strap to the correct position around the product. When the cycle starts, the sliding mechanism and clamping components work together to guide the strap around the product in the required configuration and hold it securely in position before cutting and ultrasonic sealing.

Strap pulling and tensioning unit

The strap-pulling motor can operate based on the programmed feed length or a preset torque value. This allows the system to control the amount of strap fed and the tightness of the strap around the product according to its characteristics.

Strap cutting unit

Once the strap reaches the required position and tension, the cutting mechanism separates it from the supply reel. The blade is integrated into the sealing and cutting unit to coordinate directly with the strapping sequence.

Ultrasonic sealing unit

The two overlapping layers of strapping are clamped together and joined using ultrasonic vibrations. The sealing time and actuation sequence are configured through the control system to suit the strapping material and joint requirements of each application.

Pneumatic system

Pneumatic cylinders operate the clamping, pushing, sliding, and lifting mechanisms. The air preparation unit includes a pressure gauge, pressure regulator, and control valves to maintain stable operating conditions.

Electrical and control system

The machine uses an industrial programmable controller combined with an operator interface, servo motors, a strap-feeding motor, position sensors, and strap detection sensors. The reference configuration uses a Mitsubishi PLC. Other projects can use Keyence, Mitsubishi, Siemens, or equivalent equipment according to customer requirements.

Key features

• Integrates strap feeding, guiding, tensioning, wrapping or bundling, cutting, and ultrasonic sealing into a single operating cycle.

• Joins the overlapping strap ends directly by ultrasonic sealing, eliminating the need for a separate buckle when using a compatible welded-strap configuration.

• Allows adjustment of fast and slow strap-feeding speeds, acceleration, and deceleration to suit different strapping materials.

• Supports strap-feed-length or torque-based control, making it easier to adjust strap tightness as required.

• Uses sensors to monitor strap feeding, strap position, and pneumatic cylinder status before proceeding to the next operation.

• Features an operator interface with counters for strap-feeding cycles and completed products.

• Provides manual mode for individual mechanism adjustment and automatic mode for the complete strapping cycle.

• Includes an alarm system for monitoring the safety door, servo system, sealing unit, strap feeding, sensors, and cycle time.

Operating principle

The strapping material is unwound from the supply reel and routed through the guide mechanism to the working area. Once the system is ready, the feeding motor advances the strap through the guide mechanism at the configured speed.

1. The strap is fed to the standby position, where its presence is confirmed by a sensor.

2. The product is positioned at the strapping station, and the guide mechanism directs the strap around the area to be secured.

3. The clamping and pulling mechanisms apply the required strap tightness or tension according to the programmed sequence.

4. The cutting mechanism separates the used strap section from the supply reel.

5. The ultrasonic sealing unit presses the overlapping strap ends together and forms the joint.

6. Once sealing is complete, the mechanisms release the strap and return to their home positions, ready for the next cycle.

The strap-feeding speed, feed length, pulling torque, sealing time, and delays between mechanisms can be configured through the operator interface. These parameters are adjusted according to the strapping material and the packaging requirements of each product.

Control and monitoring

The system supports both manual and automatic modes. In manual mode, technicians can operate and inspect the sealing unit, pushing mechanism, cutting blade, guide mechanism, strap-feeding motor, and pneumatic cylinders individually. In automatic mode, the machine executes the complete strapping cycle according to the configured sequence. The operator interface allows adjustment of strap-feeding parameters, speed, acceleration and deceleration, feed length, pulling torque, sealing time, air-blowing time, and cycle time. The controller also monitors sensor signals to detect conditions such as the strap failing to reach the required position, a strap-feeding timeout, or a mechanism failing to complete its stroke.

Safety and alarms

The machine can be equipped with safety doors, door interlock switches, an emergency stop button, a buzzer, and status indicator lights. If a safety door is open or a servo, sealing unit, or sensor fault occurs, the system stops and displays an alarm on the operator interface. Interlocks between the guide mechanism, cutting blade, sealing unit, and pneumatic cylinders help prevent movements from occurring in the wrong sequence. The alarm history helps technicians identify the relevant fault category during operation.

Technical specifications of the automatic ultrasonic plastic strapping machine

The following table summarizes the specifications of an actual machine configuration for reference. Specifications may vary depending on product dimensions, strapping material, packaging requirements, and the design selected for each project.

Applications of the automatic ultrasonic plastic strapping machine

The automatic ultrasonic plastic strapping machine is suitable for processes that require products to be bundled or secured with plastic strapping before storage, transportation, or transfer to the next production stage. The machine can be installed as a standalone packaging station or integrated into a production line according to the factory layout.

Typical applications

Typical applications include:

• Strapping individual products: Securing products in designated positions before packaging or transportation.
• Bundling multiple components: Grouping multiple parts or products into a single bundle for easier handling, storage, and transportation.
• Strapping soft or semi-rigid products: Adjusting the strap guide path and tension to minimize product deformation.
• Automating packaging operations: Reducing manual tasks such as strap feeding, tensioning, cutting, and joining.
• Integration into production lines: Coordinating with assembly, product finishing, or dispatch preparation processes according to the system design.

The machine's suitability depends on product geometry, strapping material, the required strapping position, and the necessary holding force. These factors should be clearly defined before selecting the machine configuration, particularly when ultrasonic welding is required to join the strap.

Maintenance of the automatic ultrasonic plastic strapping machine

Regular maintenance helps maintain the performance of the strap-feeding mechanism, pneumatic system, cutting unit, and ultrasonic sealing unit. The main inspection points include:

• Shafts, bearings, and sliding mechanisms: Check for smooth movement, excessive play, unusual noise, and proper lubrication.
• Motors and drive mechanisms: Monitor vibration, connection integrity, and abnormal alarms.
• Cutting blade: Check sharpness, wear, and cutting performance.
• Pneumatic system: Inspect operating pressure, hoses, valves, and potential air leaks.
• Sensors and ultrasonic sealing unit: Check signal status, connections, and operating conditions in accordance with the technical instructions.
• Bolts and mechanical joints: Check tightness, particularly at mechanisms subject to frequent movement.

The maintenance schedule should be established according to operating frequency and the maintenance instructions for the actual machine configuration. Before cleaning or replacing components, isolate the electrical and compressed air supplies and release any residual pressure in accordance with the applicable safety procedures.

Frequently asked questions about the automatic ultrasonic plastic strapping machine

What applications is an automatic ultrasonic plastic strapping machine suitable for?

The machine is suitable for processes that require products to be bundled or secured with plastic strapping before storage, transportation, or transfer to the next production stage. The configuration should be selected according to product geometry, strapping material, and the required holding force.

Does ultrasonic sealing require a separate strapping buckle?

With a compatible direct-welding configuration, the overlapping strap ends are joined by ultrasonic sealing, eliminating the need for a separate buckle. Compatibility should be verified using the intended strapping material.

Can the machine adjust strap tension?

In the reference configuration, the system can control strap pulling based on feed length or a preset torque value. The parameters should be calibrated according to the product's characteristics to prevent loose strapping or potential product damage.

Are the strap dimensions fixed?

The strap material and dimensions are determined by the product and packaging requirements. Customers should provide strap samples for testing to verify feeding, tensioning, cutting, and sealing performance before finalizing the machine configuration.

Which PLC brands can the machine use?

The reference configuration uses a Mitsubishi PLC. For new projects, the control system can be selected according to the customer's technical requirements and standards.

Can the machine detect strap-feeding errors?

The system uses sensors to monitor strap feeding and position. Depending on the configuration, it can generate alarms if the strap fails to reach the required position within the preset time or if a mechanism fails to complete its stroke.

Can the ultrasonic sealing time be adjusted?

Yes. The sealing time and related delay settings can be configured through the operator interface. Suitable values should be established through testing with the actual strapping material and the required joint strength.

CNC VINA custom automatic ultrasonic plastic strapping machine

The CNC VINA automatic ultrasonic plastic strapping machine is designed to automate strap feeding, wrapping and bundling, tensioning, cutting, and joining in industrial packaging operations. Depending on the application, CNC VINA can customize the strap-feeding mechanism, guide path, product fixtures, pulling force, and sealing parameters to suit the characteristics of the product. The machine design takes into account the strapping material, product dimensions, required holding force, and installation conditions at the factory. Selecting the appropriate configuration helps manufacturers standardize packaging operations and facilitates integration with existing production processes. With experience in designing and manufacturing custom industrial machinery, fixtures, and automation equipment, CNC VINA develops solutions tailored to each customer's actual production requirements.

VIETNAM TECHNOLOGY APPLICATION & CNC JOINT STOCK COMPANY

Factory: Song Cung Industrial Cluster, Dong Thap Commune, Dan Phuong District, Hanoi, Vietnam.

Office: Rox Tower Goldmark City, 136 Ho Tung Mau Street, Phu Dien Ward, Hanoi, Vietnam.

Phone: +84 916 639 355 / +84 915 744 664

Website: www.cncvina.com.vn | www.cncvina.net

Email: sale01@cncvina.com.vn | sales03@cncvina.com.vn