Bi-Oriented Polyvinyl Chloride (PVC-O) is a leap ahead in the PVC industry, showcasing properties that set it apart; including superior strength, robustness, and light weight. The meticulous execution of a highly precise production process is imperative for materializing these attributes. This article aims to dissect this production process, laying bare details to aid better understanding of the methods and tactics required for the manufacture of a high quality bi-oriented pipe.

Orientation in PVC-O Pipe Production

The Mono Axial Stretched Pipe

By examining the molecular changes during the expansion process, we can understand the significance of orientation. If a small ring is taken from the initial pipe and stretched at the proper temperature, its weight remains the same before and after expansion. However, this process results in a reduction of both the pipe's wall thickness and its length, creating a mono axially stretched ring.  Such a pipe is not an accurate representation of PVC-O, which is typically bi-oriented.

Achieving Bi-Orientation in PVC-O Pipes

To create a bi-oriented PVC-O pipe, the length of the preform must be maintained during the stretching process, while simultaneously increasing the diameter. This approach leads to an even greater reduction in wall thickness. Consequently, the orientation occurs not only in the pipe's circumference but also in the length direction.

The Rollepaal Inline Process

Rollepaal's production of PVC-O pipes is achieved through an advanced inline process developed specifically for achieving bi-orientation. Our technique guarantees constant wall thickness, optimal molecular alignment, and, consequently, outstanding product performance. Rollepaal's industry-leading techniques provide efficient and economic production of high-quality bi-oriented pipes.

 

The Role of Length Stretch in PVC-O Production

Bi-Oriented Pipes with Length Stretch

The Rollepaal process and other inline processes enable manufacturers to also increase the physical length of the preform during the stretching stage. In this case, the final result is a bi-oriented pipe combined with a length stretch. The strength and other properties of the pipe remain unaffected by the addition of the length stretch.

Integrated Sockets and Optimal Strength

Practical experience in sustained pressure testing has shown that creating sockets as an integral part of the pipe results in higher socket strength when the pipe includes a length stretch. A length stretch of approximately 20 percent will yield optimal strength for the integrated sockets.

Conclusion

Temperature control and orientation are crucial elements in PVC-O pipe production, ensuring optimal mechanical properties and performance. By applying precise temperature management and techniques such as bi-orientation and length stretch, manufacturers can produce high-quality PVC-O products. Rollepaal's dedication to professionalism and detail guarantees reliable and efficient solutions tailored to meet the industry's highest standards.