Bullnosing, Cranking & Curving

Bullnosing, Cranking & Curving:

Cranking of a profiled sheet incorporates lateral rib indentations pressed in at uniform distances which vary according to the radius requirements.

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Cranked sheets can be supplied in standard radii as follows:

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When ordering cranked sheets, details should be given using our standard information sheet. Please contact the Technical Department at your nearest branch.

Expansion: 

It should be noted that Aluminium has an expansion co-efficient which is twice that of conventional steel substrates. If the sheet is to be bullnosed on one end, then expansion must be allowed for in the opposite direction.

With the use of Saflok 700 this problem is reduced due to the fact that the profile will slide on the clip.

Standard Crank: 

Standard cranking is normally with the narrow flute uppermost and the bend away from the angular inclination.

Reverse Crank: 

Reverse cranking is normally with the narrow flute downward and the bend into the narrow flute. Applies to pierced fix profiles only.

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Different Types of Bullnosing or Cranking: 

These drawings show the various types of bullnosing and cranking available on Safintra sheeting. Before production may commence, we will require a detailed drawing giving all the required data, and duly authorized by the customer.

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Storage, Handling and Transportation: 

Wet Storage Stain: 

Steel sheets are normally treated with a special chromate solution, under strictly controlled conditions (i.e. the sheet is passivated) before leaving the coating mill. Although this process ensures long and satisfactory protection, wet storage stain can still occur. One of the main conditions which may give rise to this problem is sheets being exposed to water while stacked, which restricts air circulation between sheets.

It is therefore important that sheets remain dry and that they do not come into contact with each other at any point if exposed to water. If sheets cannot be stored in a dry storage space, they should be stood on end and spaced out at the bottom.

A drop in temperature after a warm, humid day may also lead to condensation of moisture throughout the stack. And because sheets are often placed on the ground or very close to it, where the temperature is usually at its lowest during the night, the risk of condensation is increased.

The stain that is created does not compromise the integrity of the sheet, but does have a negative impact on the aesthetic value.

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Handling: 

Keep the product dry and out of direct contact with the ground. If a stacked or bundled product becomes wet, separate it, wipe it with a clean and soft cloth to dry thoroughly. Handle materials carefully to avoid damage, don’t drag materials over rough surfaces or each other, don’t drag tools over material and protect from swarf.

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Transportation: 

Safintra profiles can be supplied in any length, limited only by handling and transport ordinance regulations. The normal length that can be transported by road is 13.2 metres. Saflok 700, 410 and Newlok can be rolled on-site to any length required.

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