Belt-punched brushes
Belt-punched brushes
Generalities
By arranging the tufts on a flexible base, a belt-driven brush is obtained, which can be motorised via pulleys or drums. On the pulleys (trapezoidal or rectangular), brushes of limited width are to be mounted, usually with one or two rows of tufts. On the drums, wider brushes are fitted, with many rows of the tufts.
Belt brushes are used for:
- Brushing flat surfaces
- Transport of flat parts
- Transport of three-dimensional objects (caps, bottles, etc.) We can supply brushes on polyurethane (PUR), leather or felt belts
We can also inset belts supplied by the customer.
In this case it must be remembered that only brushes on belts with a hardness of more than 90 Shore A can be manufactured. If the base is PUR, the brush is supplied in metric lengths with a single piece generally 30 m long. This considerably reduces assembly waste. The leather base can also be available with a thin layer of synthetic material to make it unstretchable.
Standard sizes for belt brushes with PUR base are shown in the table. Other sizes are available upon request. Brushes on felt belts can be manufactured in widely varying sizes. Compared to leather, they can be handled by drums with a smaller diameter since it is a more flexible and softer material. For the same reasons, however, the mechanical hold of bundles is inferior to that of brushes on leather.
Self brushis a belt brush on a 7×7 mm rectangular polyurethane base.
Standard delivery includes corrugated black nylon 0.30 with a height of 30 mm. It is supplied in rolls of 10 m and can be used directly by the customer for roller brushes, flat brushes or simple seals.
Self Brush is very useful for self-building prototypes or making urgent brushes.. In fact, Self Brush is easily cut to size with a normal cutter.
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Frequent questions
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.
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.
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.
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.
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.
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.
Of course, we can provide FDA or FOOD GRADE certifications and filament traceability.
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 …
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.
