1. Introduction
Bellows pipe is widely used in drainage, cable protection and municipal construction. In bellows extrusion production, cooling is a key process that directly affects pipe shape, surface quality, stiffness and product pass rate. Improper cooling will cause deformation, wavy errors, rough surface and low stiffness.
2. Common Cooling Defects & Simple Solutions
Most bellows quality problems are caused by unstable cooling temperature, uneven water flow and unreasonable cooling speed. The table below shows common issues and practical improvement methods:
|
Common Cooling Defects |
Main Causes |
Simple Improvement Solutions |
|---|---|---|
|
Irregular wave shape & pipe deformation |
High cooling water temperature, insufficient cooling, uneven water spray |
Keep water temperature at 20-25℃; stabilize water pressure; ensure full cooling before traction |
|
Pipe bending & warping |
Unbalanced cooling on pipe surface, inconsistent cooling speed |
Realize 360° uniform cooling; use gradual cooling to reduce internal stress |
|
Rough surface & water marks |
Blocked nozzles, unstable water pressure, slow cooling shaping |
Clean spray nozzles regularly; stabilize circulating water pressure and temperature |
|
Wall thickness deviation & dimensional error |
Cooling speed does not match extrusion speed |
Match cooling capacity with production speed; fix stable cooling parameters |
|
Low ring stiffness & easy collapse |
Too fast cooling, incomplete pipe wall shaping |
Avoid rapid cooling; add secondary cooling to ensure full pipe solidification |
3. Main Bellows Extrusion Cooling Technologies
3.1 Spray Cooling Technology
Spray cooling is the most common cooling method for bellows extrusion lines. High-pressure circulating water evenly cools the pipe surface with fast speed and good shaping effect. It fits for PVC, HDPE and PP single-wall and double-wall bellows.
3.2 Vacuum Sizing Cooling Technology
This technology combines vacuum sizing and water cooling. It can fix pipe outer diameter and wave shape while cooling. It effectively improves pipe roundness and dimensional accuracy, suitable for standard and high-precision bellows production.
3.3 Gradual Secondary Cooling Technology
For large-diameter and thick-wall bellows, one-time fast cooling causes internal stress and deformation. Segmented gradual cooling ensures stable shaping, improves pipe toughness and avoids later cracking or deformation.
4. Practical Cooling Production Tips
Stable Parameter Setting Set fixed water temperature, water pressure and cooling length according to different pipe sizes. Do not change parameters randomly during mass production.
Regular System Maintenance Clean water tank, filter and spray nozzles regularly to avoid blockage and ensure stable cooling effect.
Professional Equipment Support Stable cooling effect relies on high-quality extrusion equipment. Qingdao JBD Machinery Co., Ltd. provides high-performance bellows extrusion lines with uniform cooling system and stable operation, helping factories produce qualified pipes steadily.
Cooling technology is vital for bellows pipe quality. By adopting correct cooling methods, stabilizing process parameters and maintaining cooling systems, manufacturers can greatly reduce defective rate and improve production efficiency. If you need reliable bellows extrusion machines and technical support, welcome to contact Qingdao JBD Machinery Co., Ltd.
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