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Processing of purlins

Purlins are horizontal structural members used in building structures to support roof covering materials.Typically, purlins are manufactured through the following processes:

Material Preparation:

Purlins can be made of steel, wood or other suitable materials depending on the building design and requirements.

For purlins in steel structures, common materials include steel plates, angles and I-beams.


The initial processing step is to cut the raw material into desired lengths.

For steel, cutting can be done using equipment such as shears, cutters or flame cutting to get the exact size according to design specifications and requirements.


The cut material can be molded by cold bending or hot bending to get the required cross sectional shape and size.

For purlins in steel structures, steel plates or steel can be bent into the required shape using equipment such as cold bending machines or rolling machines.


Some purlins may require additional processing steps such as punching holes, cutting ports of specific shapes, or edge treatments in order to connect or install with other members.

Coating treatment (optional):

For steel purlins, they can be treated with rust prevention or coatings to increase their corrosion resistance and extend their service life.

Common coatings include spraying anti-rust paint, hot dip galvanizing or applying anti-corrosion coating.

Quality Inspection:

Upon completion of processing and coating treatment, purlins are usually subject to quality inspection to ensure that they meet the design specifications and requirements.

The inspection may include dimensional measurement, appearance inspection, coating quality inspection, etc.


Through the above processing steps, purlins can be produced according to the design requirements and play an important role in supporting the roof covering material in the building structure.