Grace PVC-O pipe extrusion line

PVC-O pipe is a new type of pipe made from PVC-U pipe through a special orientation processing technology. The pipe undergoes biaxial stretching in both the axial and radial directions, which arranges the polymer chains in an orderly, mesh-like structure. This results in a pipe with high strength, high toughness, excellent impact resistance and fatigue resistance.

Grace PVC-O pipe extrusion technology combines controlled processing with dependable dimensional performance for modern pipe production.

Line equipment

Parallel twin-screw extruder

The 36 L/D parallel twin-screw extruder provides the controlled PVC melt preparation required for a stable preform pipe before orientation.

PLC control system

Centralised line control coordinates the principal process parameters and provides operators with a clear view of the production process.

Die head

The die-head design supports controlled melt distribution and a stable preform pipe profile before the in-line orientation process begins.

Vacuum tank

Vacuum and cooling are configured for stable preform geometry, controlled water management and practical maintenance access.

Preform pipe haul-off

Independent servo drives and high-friction rubber blocks help maintain controlled preform traction before the pipe enters the orientation stations.

Infrared heating

Independent heating zones and automatic temperature adjustment bring the preform pipe to the required orientation temperature with responsive control.

Biaxial orientation station

The in-line orientation process combines radial expansion and axial stretching to form the ordered molecular structure required for PVC-O pipe production.

Automatic wall-thickness control

Online measurement and linked process control support consistent wall thickness through the orientation and production process.

Heavy-duty haul-off

Two coordinated haul-off units use measured tension and synchronized speed control to support stable handling through the final line stages.

Dust-free cutter

The final cutting station provides controlled positioning, secure clamping and dust collection for clean, consistent pipe ends.

Defining a PVC-O line through a controlled orientation project

PVC-O is not a conventional PVC line with an additional downstream module. The preform, temperature conditioning, radial expansion, axial stretching, cooling, measurement and acceptance route are engineered as one controlled project around the target market and product schedule.

• Product definition before equipment: the project begins with the applicable market requirements, complete DN x PN or wall-thickness schedule, PVC formulation and intended application.
• Preform extrusion and conditioning: the parallel twin-screw extruder, preform die, calibration and temperature-conditioning stages are configured to establish a controlled preform before it reaches the orientation section. Tooling and temperature windows are specific to the selected product.
• Integrated radial and axial orientation: radial expansion and axial stretching are coordinated with heating, line speed and downstream handling, reviewed as a connected route rather than a collection of independent machines.
• Measurement and validation plan: in-line dimensional measurement, process-data recording, finished-pipe handling and the project validation route are selected together. Performance classes, certification and customer acceptance are confirmed only against the applicable project plan.

Information for a technical proposal

• Target market, applicable standard edition and the intended PVC-O application
• Complete DN x PN or wall-thickness schedule and required product form
• PVC formulation, material class and design inputs required for the project
• Tooling, socketing, cutting, marking, handling and packing requirements
• Factory utilities, available line length, water conditions and electrical supply
• Required measurement, traceability, validation and customer-acceptance plan

Product range, output, pressure class, standards, certification and acceptance criteria are released only after project-specific technical, quality and regulatory review. Historical concepts or trial conditions are not universal performance promises.