Vacuum belts

Vacuum belts are especially well established in the packaging industry. Here, they ensure precise feeding and reliable haul-off of packaging films on form-fill-seal machines and film take-off systems, just to name a few. However, vacuum belts are also used in almost any other sector for the high-speed transport of lightweight unit loads, films, paper, cardboard and similar materials. In the printing industry, for example, they are used for the mark-free transport of printed sheets of paper. Vacuum belts are also best suited for transporting single envelopes, chip cards, coffee pads, hygiene articles or even metal blanks..

Vacuum belts can be very diverse in their materials and designs. The following options can be used to manufacture and optimize a vacuum belt:

Vakuum Zahnriemen Bänder Keilrippenriemen

Vakuum Zahnriemen Bänder Keilrippenriemen mit Silikon PAZ

Vakuum Transportzahnriemen Bänder Keilrippenriemen mit Silikon PAZ

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oder Telefon 0800 2338 2338 & Mail anfrage@alphabelt.de

Selection of the base belt

Generally, we can manufacture vacuum belts from any type of basic belt, whether timing belts, poly-V belts or conveyor belts. Each of these is available in different base materials. Very often, the well-proven belt materials PU and neoprene with tension cords made of Kevlar are used. The choice of a suitable base belt depends, for one, on the nature, dimensions and weight of the goods to be transported and, for another, on the conditions of use, i.e., for example, the speed, the forces to be transmitted, the temperature, the contact pressure, abrasive or chemical influences, and so on.

Punching of the belt and milling of vacuum pockets

The simplest way of creating a vacuum belt is by merely punching holes through the base belt, whereby the diameters and hole spacings can be freely chosen. Additionally, pockets can be machined into the back of the belt. These pocket structures are usually CNC-milled, as the geometry can thus be designed as desired and individualized according to customer specifications. In operation, these pockets generate suction when pressed against the material to be transported, which facilitates precise handling.

Milling of a vacuum channel into the tooth side

If this simple suction effect is not sufficient for reliable adhesion, for example with high haul-off speeds or heavier goods, an additional vacuum can be applied to the belt. For this purpose, we mill a continuous suction channel in the longitudinal direction on the tooth side of the belt. The width of the channel is variable. During operation, the vacuum applied there is transferred via the perforations to the contact surface with the transported material.

Vakuum Transportzahnriemen Bänder Keilrippenriemen mit Linatex beschichtet

Vakuum Transportzahnriemen Bänder Keilrippenriemen mit PU gelb beschichtet

Application of a coating

A further improvement in certain properties can be achieved by the application of a suitable coating. Depending on the combination of base belt and coating material, this is welded, vulcanized or bonded on. Typical coating materials include PU and silicone in various degrees of hardness, which can be vulcanized on without joints up to a thickness of 6 mm. Silicone coatings, for example, are distinguished by hardnesses of up to 50 SH.A and excellent grip properties; they are dehesive and temperature resistant up to 200 °C. Other coating materials frequently used are neoprene and Linatex. For an increased durability of the belt even under difficult operating conditions, a wear-resistant layer of polyamide is recommended on both the tooth and the back side, as necessary.

Special type: timing belt with vacuum suction cups

For slip-free transport and positioning of flat parts, timing belts with suction cups may also be considered. With this solution, the suction effect is not generated directly by the belt or the vacuum pockets, but by special suction cups that are attached to the belt. The suction cups can be manufactured according to the customer's specifications, depending on the geometry of the parts to be transported. A two-stage design is also feasible here. The distances between the suction cups can be freely defined.

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