Interchangeable sector strip brushes

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Interchangeable sector strip brushes

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Interchangeable sector strip brushes are used for:

  • sanding wood and metal panels and frames
  • cleaning conveyor belts
  • brushing of large surfaces (such as formwork, etc.)

Together, they form a roller brush, however, made up of numerous linear strips with a variable B base. These strips can be replaced without dismantling the brush body, making maintenance easier. The strips are often mounted with a slight helix α in order to make their action on the workpiece more gradual. The most classic configuration of sector strip rollers consists of a metal core with interchangeable strips mounted on welded guides. This is a particularly robust construction that allows for very heavy-duty machining.

For industrial sanding of wood, in particular doors, window frames and panels, the sandpaper roller shown in the picture (Sandy Brush) is particularly efficient.

The sanding element is suitably frayed abrasive cloth, supported in its action by a PP or buffer brush. The combination of abrasive cloth and brush provides the right rigidity and adaptability to the workpiece. With our system, it is possible to replace either the abrasive cloth only or both brushes independently, without removing the brush body from the machine and quickly. It is also possible to give a variable helical component to the strips. This is done by means of a rotor operated by means of a simple key. In this way, the user can set the most suitable propeller on Sandy Brush, either left or right. Below 500 mm brush length the rotor is not fitted. Sandy Brush can be adapted to any motor shaft diameter, within the maximum value given in the table. The brush body is made of synthetic material mounted on an aluminium tube. Configurations according to the table are possible.

Other outer diameter sizes and abrasive grits can be requested as special production. The brushing length L can be chosen as desired in multiples of 10mm.

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What is the advantage of using a brush instead of another deformable object?

The special feature of the brush is that the work surface is made up of millions of individual elements, which are the ends of the individual filaments.

This gives the brush an adaptability that no other element, however deformable, can have.

How much should the brush interfere with the workpiece?

It depends on various factors. In a nutshell, it can be said that 2 mm is a good compromise. The important thing is that the filaments of the brush work “at the tip” and not on the side.

Can a bunch of filament be detached from the brush body?

Depending on the materials used and the dimensions, there is a tensile limit load that a single bunch can withstand.

Beyond this limit the bunch comes off, therefore the brush must be calculated according to the use. This limit can be greatly increased by building “sewn” or “tied” brushes by hand, where a continuous steel wire is placed instead of a single anchor element.

Is a punched brush or a strip cheaper?

There is no single answer. Speaking for example of cylindrical brushes, the strip brush is generally cheaper when dimensions are important (e.g. over one meter in length). For small dimensions, punched brushes are certainly more suitable and convenient.

Is it possible for a single filament to come off the bundle and contaminate the product?

It can only happen if the brush has a manufacturing defect, like any other type of object (e.g. a roller made with silicone flakes, one of which is defective and breaks).

When it is important that no contamination occurs, it is advisable to use synthetic (non-natural) fibers with a diameter greater than or equal to 0.15 mm.

Which brush softness or hardness can I get?

Virtually all degrees of hardness can be had, from very soft to very hard. In fact, the hardness is given by the combination between the diameter of the filament, its free length and the density of the bunches.

Is it possible to have a certified 'food grade' brush?

Of course, we can provide FDA or FOOD GRADE certifications and filament traceability.

Is it possible to have an ATEX certified brush?

Unfortunately not, as it is the machine + brush assembly that must be ATEX certified, not just the brush.

It is however possible to provide the materials that the certifier requires, eg. conductive bases, conductive filaments etc …

Is it possible to “regenerate” a worn brush?

Generally speaking it is possible, but it is necessary to evaluate if it is economically convenient, and it is not always. Furthermore, in the case of a punched brush, it is not advisable to regenerate the brush more than twice in order not to reduce the holding of the bunches.