This machine mainly take PVC, PP, PE as the material production small-caliber single-walled corrugated pipe. To the corresponding mold forming outside a smooth, uniform Bellows corrugated products. Thread wire and cable management, and laundry drains, vacuum cleaners ducts, ventilation, etc. 4-6.7mm so painstakingly researched the use of small-caliber car line bellows, fill the gaps.