"Purlins are very important in construction. Known also as purlins, these horizontal roof beams traverse the rafters or trusses. They help to stabilize the roof, much like the frame of a home, so supporting the rafters and roofing materials. Purrlin has evolved several times in line with ongoing improvements in materials science and building technology. They are mostly split today into secondary purlins and primary purlins. Primary purlins are often connected to structural columns and beams, bearing the primary load-bearing responsibility and supporting the roofing materials. Distributing the load across the secondary purlins and other supporting members, they are the workhorses of the roof frame. Between the main purlins, secondary purlins form a truss structure with them to improve the load-bearing capacity and stability of the roof system. Meanwhile offering backup for the roofing materials.
The purlin connection method is also extremely important and must comply with relevant structural requirements to ensure the stability and safety of the entire building structure. For example, C purlins can be connected using welding or bolting. Welding is strong but can readily warp steel. Bolting helps in disassembly, but its low strength demands measures to stop loosening. Depending on the particular project circumstances, various linking techniques should be correctly chosen to guarantee the whole stability of the structure."
1/Purlins in Steel Structures
Steel purlins are made from hot-rolled steel sheets and formed through a cold-bending process. They are primarily used in roofing and wall systems in steel structures, as well as in machinery manufacturing. They are primarily C-shaped and Z-shaped, featuring thin walls, low weight, excellent cross-sectional properties, and high material efficiency. Depending on the construction design, galvanizing can be selected to enhance corrosion resistance. Purlins of different cross-sectional shapes (such as C-shaped and Z-shaped steel) vary in mechanical properties and applicable applications.
In some large-scale steel-structured industrial plants, purlins made of C-shaped or Z-shaped steel are widely used. Their great strength and toughness make them perfect for heavy-loaded, big-span industrial constructions. Z purlins, for instance, have a distinctive Z-shaped cross-section that provides great load-bearing ability and stability, hence resisting exterior pressures. Moreover, the parallel arrangement of the two flanges greatly increases construction efficiency by making it easier to connect other purlins, support frames, and other elements.
2/Differences Between C Purlin and Z Purlin
Modern building construction depends critically on C purlins and Z purlins, which offer reinforcement for wall and roof structures. Common applications include columns, beams, girders, keels, floor slabs, composite materials, among other elements.
1.1 Cross-sectional Shape
C purlin: Usually at a 90-degree angle, perpendicular to the base, their cross-sectional shape is the letter C with a symmetrical structure and an open groove design.
Z purlin: Usually between 60 and 75 degrees, its cross-section looks like the letter Z and has two connected grooves at angles usually less than 90 degrees. It is appropriate for longer span buildings.
1.2 Load-Bearing Capacity
C purlin: For buildings with shorter spans, C purlins provide stable performance under consistent loads.
Z purlin: Larger loads or longer spans benefit structures using Z purlins. Their great torsional and bending resistance helps them to carry bigger loads with fewer supporting locations.
1.3 Application Scenarios
C-Purlin:
-Lightweight Construction: Used in lightweight, easy-to-install structures such as roofs and wall structures in small factories, warehouses, machine rooms, and residential roofs.
-Small Span: Suitable for roof systems with smaller spans.
-Cost-Effective Option: Ideal for projects with limited budgets seeking to reduce material and construction costs.
Z purlin:
-Long-span buildings: Suitable for roof and wall structures of large structures such as industrial plants, stadiums, and exhibition centers.
-Complex structures: Z purlins provide multi-directional support, providing uniform support in multiple directions, enhancing the overall stability and safety of the structure.
-High-demand projects: Designed for buildings that need to withstand extreme weather conditions, earthquakes, and other natural disasters.
3/What is a CZ Purlin Roll Forming Machine?
The cz purlin roll forming machine uses galvanized or cold-rolled steel strip with a thickness of 1mm-4mm as raw material. Through uncoiling, flattening, punching, forming, and cutting, it continuously produces CZ purlins. It also smoothly converts from C-shaped to Z-shaped profiles. Operation is simple, requiring no complex manual intervention; simple operations enable easy switching. The machine can produce purlins of various sizes, ranging from 80mm to 300mm in width. KINGREAL Roll Former is happy to customize machines for larger and more specific sizes.
Now that you understand the differences between C purlin and Z purlin, you're ready to get a quote for a cz purlin roll forming machine. KINGREAL Roll Former, with over two decades of experience in cz purlin roll forming machine manufacturing, is happy to assist you. For more information on different types of equipment, or if you're ready to purchase, contact KINGREAL Roll Former today.
To provide a more accurate quote and meet your specific needs, please provide the following details:
- Image of the profile or sample
- Thickness and width of the material