What Is Purlin Roll Forming Machine? 

C&Z Purlin Roll Forming Machine

The C&Z purlin forming machines are specifically used to manufacture multi-size C and Z purlin channels.

The Roll tools are carved in highly precise CNC machines which gives it better quality and longer service life as we say “Quality & Service are the main ingredients of our Machines”

The Machine’s parts are all made with precision and experienced personals, with optimum quality roll tools so you never have to worry about the machine quality.

C&Z Roll Forming Machine for standard size C80-300MM, Z 100-300MM, Raw material thickness1.5-3.0mm, with three punch hole device, two device to punch the bottom, one device to punch side .

How purlin roll forming machines work

Working principle

You use a purlin roll forming machine to turn flat metal sheets into strong beams for construction. The machine uses cold forming technology. It pushes the metal through a series of rollers. Each roller bends the sheet a little more until you get the shape you want, like C, Z, or U profiles. The machine handles the whole process for you. It starts with uncoiling the metal and ends with cutting and stacking the finished purlins. You get precise shapes every time.

Automation makes your work easier and more reliable. You can see how technology improves production in the table below:

You get consistent results and fewer errors when you use automated machines. You spend less time adjusting settings and checking for mistakes.

Types of purlins and machine flexibility

1. Classification by Profile Shape

You can produce many types of purlins with a purlin roll forming machine. Each shape has a special job in construction. Here are the main profiles:

• C purlins : You use these for roof and wall support. They look like the letter "C" and fit well in frames.

• Z purlins : These work best for overlapping joints. You often see them in large roofs and steel buildings.

• U purlins : You choose these for light support and simple structures. They have a flat bottom and straight sides.

• C/Z Interchangeable Purlin : A dual-purpose machine that can switch between C and Z profiles using an adjustable roller station or reversible shaft design. Offers high flexibility for manufacturers handling diverse projects.

2. Classification by Adjustability (Size Change)

Different purlin roll forming machines handle size changes differently.

• Fixed-Size Purlin Roll Former
  Rolls only one web height and flange width. Low cost but requires separate tooling for each size. Suitable for mass production of a single purlin specification.

• Adjustable (Variable-Size) Purlin Roll Forming Machine
  Allows manual or motorized adjustment of roller spacing to produce various web heights (e.g., 100–250 mm). Reduces tooling change time.

• Servo-Driven Automatic Size Change Machine
  Features PLC-controlled servo motors that reposition rollers in under 5 minutes. Ideal for just-in-time production of different purlin sizes without stopping the line.

3. Classification by Automation Level

From entry-level to fully automated purlin production lines.

• Manual Purlin Roll Former
  Requires operators to feed coils, adjust rollers, and cut lengths manually. Low output, but low initial investment.

• Semi-Automatic Purlin Roll Forming Machine
  Includes automatic uncoiler, roll forming, and hydraulic cutting, but size changes and hole punching are manual. Common in small workshops.

• Fully Automatic Purlin Roll Forming Line
  Equipped with servo feeder, automatic punching (web & flange holes), flying cut-off, and auto stacker. One operator can manage entire cold-formed purlin production via touchscreen HMI.

4. Specialized Classifications

• Light-Gauge Purlin Roll Forming Machine
  For metal thickness 0.8–1.5 mm – used in light steel framing (e.g., prefab houses, partitions).

• Heavy-Duty Purlin Roll Former
  For thickness 2.0–5.0 mm – used in primary structural members for large pre-engineered buildings.

• Portable / Mobile Purlin Roll Former
  Mounted on a trailer or skid, this compact roll forming machine can be moved to job sites (e.g., construction sites for long-span purlins up to 20m).

5. Classification by Cutting Method

• Flying Cut-off Machine – Cuts while moving, no stop in production.

• Hydraulic Stop Cut Machine – Pauses the coil for cut-off, slower but more precise for thick materials.

Summary Table: Purlin Roll Forming Machine Types

Purlin classifications

Steelmama make C purlin roll forming machine, that is the forming machine only make C shape size from 3inch to 12 inch for example. or CU forming machine or CG purlin machine, with punch hole or not, please tell us your requirement, we will design your required roll forming machines.

This CZ purlin forming machines include 3 ton manual decoiler , forming system with optional punch hole device, post cut device, run out table , PLC control system , run out table

between C and Z , adjust some upper layer rollers with lower rollers by handwheel 180 degree turn.

for different size ,move whole line roller with bottom press control, easy and time saving.

Advantage of our purlin machines:

1. The small size less than 120mm of Z purlin made by special design , very straight and not twisted. Generally, the small size of Z purlins made by other factory is not straight and will twist.

2. A 75mm solid shaft is used, and the H-shaped steel is used as the base frame, so that the machine can withstand long-term production without deformation of the machine, thereby ensuring long-term production of quality purlins ;

3. The rollers are GCR15 material and processed by CNC machine tools to ensure the accuracy of the rollers, and thus the accuracy of the final purline.

4. Our cut frames are stress-relieved to ensure that they are not deformed during the long-term production process, making  c purlin smoothly.

5. Use Mitsubishi or Siemens operating system with stable performance, simple operation

6. forming speed can reach 10-15 meters per minute

7. The  c z purlin with punch machine weighs about9tons

Purlin Forming Machine Manufacturing

Our purlin machine is made to produce different shapes purlin in pre-painted, galvanized, and also hot rolled “black” steel, all our purlins are 55 KSI minimum yield strength quality.

Each line can be loaded with coil entry equipment, including uncoilers, as well as a wide range of hole punching systems for inline web and flange hole placement with high accuracy.

Purlin rollformers cover the range of material types, as well as thicknesses for any market. Even the automation of gapping the roll tooling for different thicknesses can be added so that your operator does not have to adjust the top shaft for material thickness changes.

FAQ

What materials can you use in a purlin roll forming machine?

You can use galvanized steel, cold-rolled steel, or sometimes aluminum. Most machines handle thicknesses from 1.2 mm to 3.0 mm. Always check your machine’s manual for the best results.

How do you switch between C and Z purlin profiles?

Modern machines let you change profiles with a button. The rollers and tools adjust automatically. You do not need to stop for long or change parts by hand.

How accurate are the finished purlins?

You get high accuracy with these machines. Most lines keep length errors within ±1 mm. Holes and slots also stay in the right place, thanks to servo controls and sensors.

Do you need special training to operate a purlin roll forming machine?

You do not need advanced training. Most machines use touchscreens and simple controls. A short lesson helps you learn the basics. 

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