PRS Cooling Rolls Deliver Reliable Post‑Stretching Cooling for BOPP, BOPET and BOPA Manufacturing

For facilities operating biaxially‑oriented film production systems, consistent and even cooling right after transverse drawing (TDO stage) plays a decisive role in finished‑film quality. It directly governs dimensional stability, surface flatness and mechanical property consistency of final web products. As the core chilling component installed in the traction section, PRS cooling rolls undertake this vital post‑stretching cooling mission. Different surface‑modified PRS roll types work in sequential coordination throughout the stretching workflow. This news article elaborates differentiated surface finishing options, interprets ozone‑induced failure risks of ordinary chill rolls, presents complete technical specifications and references real‑world project deployments across international film‑making workshops.

Three PRS Cooling Roll Variants for Different Process Zones

Three specialized surface‑treatment solutions have been engineered to adapt to varied operating conditions at individual process nodes on film stretching lines. All three roll versions support maximum film width up to 10.6 meters, with permissible running velocity adjustable to satisfy diverse manufacturing requirements.

Hard‑chrome‑plated PRS cooling rolls feature heavy‑duty electroplated chrome layers, delivering superior wear‑resistant capability and efficient heat exchange capacity. This model is deployed immediately downstream of transverse stretching TDO equipment, and it can keep stable operation under line speed reaching 600 m/min.

Anti‑stick coated PRS cooling rolls are covered with dedicated non‑adhesive functional layers. The coating effectively prevents adhesion between hot soft film substrates and roll surfaces, eliminating sticking‑caused surface defects on finished goods. This variant fits the intermediate traction area after primary cooling, with maximum allowable operating speed of 650 m/min.

Ozone‑proof anti‑corrosion PRS cooling rolls adopt full anti‑corrosive stainless steel base material to defend against oxidative damage triggered by corona‑generated ozone. It is positioned behind corona modification stations and supports running speed up to 650 m/min. The three roll types are fully compatible with production workflows for BOPP, BOPET, BOPA and adhesive‑tape substrates.

Ozone‑Induced Degradation Risks for Conventional Cooling Rolls

Corona surface‑modification processes rely on high‑voltage electric discharge, which generates large volumes of strongly oxidative ozone gas. When ozone penetrates the surface coating layer of standard chrome‑plated cooling rolls under long‑time continuous operation, chemical corrosion occurs gradually. Typical failure manifestations include coating bubbling, blister formation and complete layer peeling. Production managers should note that simple recoating cannot fix permanent structural deterioration brought by ozone erosion. Once such damage emerges, partial surface repair will lead to repeated coating flaking and unplanned production halts; full roll replacement becomes the only viable resolution.

Complete Structural and Precision Specifications for PRS Cooling Rolls

Every PRS cooling roll adopts dual‑shell circulating water cooling architecture, with water inlet and outlet ports arranged on one single end of the roll assembly.

• Material configuration: Inner and outer shells are fabricated from Q345B structural steel. Outer shell components are assembled via high‑precision interference‑fit technology.
• Internal flow‑channel layout: Independent water circulation pipelines can be re‑designed according to the layout constraints of each customer’s production site.
• End‑part construction: The drive side uses forged flanges and solid roll shafts made of high‑strength low‑carbon alloy steel. The operating‑side flange and shaft head are alloy‑forged components, secured by interference fitting plus full penetration welding procedures.
• Geometric precision criteria: Out‑of‑roundness and cylindricity are both controlled within 0.1 mm.
• Dynamic balancing standard: G2.5 balancing grade, suitable for peak line speed at 630 m/min.
• Available surface treatment options: Hard‑chrome plating, anti‑stick functional coating, ozone‑resistant anti‑corrosion finish.

Global Project Application Footprint

Our firm has supplied tailored PRS cooling roll packages for over one hundred complete BOPP and BOPET production projects distributed across more than ten countries and regions, maintaining long‑term cooperative ties with multiple well‑known film‑manufacturing conglomerates. After legacy cooling hardware gets replaced with PRS cooling rolls, partner factories achieve optimized film‑stretching conditions, realizing 5%‑10% improvement in overall production throughput.

Custom Engineering Support Services

Whether customers plan new biaxial‑film line construction or execute refurbishment and substitution of existing aging rollers, our specialized engineering team provides one‑on‑one parameter matching, customized structural design and full‑lifecycle technical assistance.

Contact Information

Jenny Liu Mobile / WhatsApp: +86 17743789775 Email: sale05@huataogroup.com Official Website: https://www.huataomulti-indusrolls.com/other-industry/

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