What are vacuum cups?

Vacuum cups or vacuum suction pads are elastic, usually cup-shaped components that adhere to surfaces using a vacuum system. They serve as a switchable connecting element between a workpiece and a handling system, for example a robot arm or a gripper. The negative pressure generated inside the suction cup creates an adhesive force that makes it possible to lift, hold or move objects without jamming or damaging them mechanically.

 

The structure of a vacuum cup typically consists of:

  • Suction body (lip or bell): ensures sealing and flexible adaptation to the workpiece
  • Connection nipple or threaded insert: connects the suction cup to the vacuum line
  • Support element: integrated if required to ensure dimensional stability or minimise shear forces

 

There are numerous designs - from flat vacuum cleaners for smooth surfaces to Bellows-suction pads with multiple bellows for uneven or curved workpieces. Vacuum suction pads are a central element of automated handling technology in modern industry and enable gentle, precise and fast processes.

 

Functions & applications of vacuum cups

The central function of a vacuum cup is to provide adhesion through negative pressure. A vacuum is generated inside the suction cup, creating a pressure difference to the environment. This difference generates an adhesive force that is proportional to the suction surface and the pressure difference. The decisive factor is the precise matching of geometry, material and vacuum level to the object to be handled.

 

Main functions:

  • Fixing and holding workpieces with smooth or textured surfaces
  • Transporting and positioning in automated processes
  • Gentle gripping of sensitive materials without damaging them
  • Compensation of tolerances and height differences through flexible bellows structures
  • Vibration and shock absorption for moving components

 

Typical areas of application:

  • Automotive industry: handling of sheet metal parts, glass, plastic components or interior components
  • Packaging industry: pick-up of films, cardboard packaging, bags or labels
  • Electronics production: Gripping sensitive printed circuit boards or displays
  • Wood and glass industry: transport of heavy or smooth panels without mechanical fixation
  • Robotics and automation: as an end effector for pick-and-place systems
  • Medical technology: handling sterile packaging or sensitive components

 

Vacuum cup components & materials

The choice of material for a vacuum cup depends on the workpiece to be gripped, the surface properties, temperature and ambient conditions. The aim is to achieve an optimum combination of elasticity, coefficient of friction, sealing effect and service life. Common materials for vacuum cups are

  • NBR (nitrile rubber): high abrasion resistance, oil and fuel resistant
  • Silicone (VMQ): temperature-resistant up to +200 °C, very soft, ideal for sensitive surfaces, food contact or cleanroom applications
  • EPDMresistant to water, vapour and ozone, often used in outdoor applications
  • FKM (Viton®): resistant to chemicals, suitable for aggressive media and high temperatures
  • TPEthermoplastic alternative with customisable hardness and recyclability

 

Different design variants are used depending on the application:

  • Flat vacuum cleaner: for smooth, even surfaces
  • Bellows suction cupswith 1-3 bellows for uneven or curved workpieces
  • Oval or long suction cups: for narrow, elongated parts
  • Antistatic or ESD vacuum cleaners: for electronics production

 

Production usually takes place in the Injection moulding process, In the case of high-performance suction cups, this can also be done in a multi-component process in order to combine different material hardnesses in one component. In the case of metallic connections or reinforcements, the elastomer body is moulded over Vulcanisation with the carrier material.