Compared with wire nails, umbrella head roofing nails have higher profit and less competition,while it need higher skill to produce roofing nails.
A roofing nail is mainly used for installing roofing (sometimes for water-resistant drywall,tile backer board etc). The main feature that distinguishes a roofing nail is its large head. Galvanization appearance, which is usually much larger and flatter than other types of nails. This permits the nail to hold down roofing felt and roofing shingles without tearing through the material. Roofing nails generally come in lengths of 1 to 1.75 inches (2.54 to 4.44 cm), although shorter and longer nails can be found.
HOW TO MAKE ROOFING NAILS IN PROCESS
using the wire drawing machine draw steel wire to different diameters. The difference is that needs to add a twist device to make the steel wire spiral. Then will make the spiral grab the wood well.
Second step, make the roofing nails by Automatic roofing nails making machine. This step looks simple but actually it needs skilled operation to make one shaft one head. If not, there will be some problems. Such as there is no head for the shaft or one nail body have 2 head/caps. But don,t worry for this problem,you can learn the skills in your factory until you master all the skills perfectly.
Galvanization. The roofing nails should bear couple of years rain, snow, sunshine, etc. So galvanization must to prevent the roofing nails from rusting.