PET,PP strapping (plastic-steel strapping) screw

The screw design of a PET/PP strapping production line directly impacts the plasticizing effect and product quality. Key features and technical points are outlined below:

1.Screw Parameters and Structural Design

• For PET raw materials, a screw design with an adjustable aspect ratio and structure is used to accommodate the processing requirements of different raw materials (such as waste PET bottle flakes), ensuring uniform plasticizing and low energy consumption. A vented screw can also be used.
• For PP raw materials, the screw can be designed as a BM type with a barrier structure, depending on the raw material, ensuring uniform plasticizing and low energy consumption. A vented screw can also be used.
• Some equipment addresses insufficient plasticizing by optimizing the screw combination, such as adjusting temperature or speed to increase barrel fill and stabilize die pressure.
• JED has extensive experience in screw and barrel production for strapping (plastic-steel strapping) and has received praise from numerous domestic and international customers.

2.Stretching System Integration

• Some production lines incorporate PET/PP film stretching concepts into the screw rear section design, combining infrared heating and stretching rollers to achieve more uniform stretching and enhance strapping toughness.

3. Common Problems and Solutions

• Feeding Blockage: This may be caused by raw material agglomeration or excessive lubricant. Check the feeding system and adjust the formulation.
• Poor Plasticization: This can be corrected by increasing the temperature, replacing the die, or optimizing the screw assembly.

4.Intelligent Control

• The advanced production line is equipped with a PLC intelligent control system that monitors melt temperature, pressure, and other parameters in real time to ensure stable screw operation.