Suction cup is also known as a sucker, which uses the negative weight of air or water and takes a grab on the surfaces which makes it a half vacuum. Suction cups are fringe characteristics of certain creatures, for example, octopuses and squids and have been duplicated misleadingly for various purposes. The power required to isolate a perfect suction cup by pulling it straightforwardly away from the surface is given by the recipe: 

F = A P 

where: 

F is the power, 

A is the region of the surface secured by the cup, 

P is the weight outside the cup (normally barometrical weight) 

This is gotten from the meaning of weight, which is: 

P=F/A 

The above recipe depends on a few suspicions: 

• The external distance across of the cup does not change when the cup is pulled. 
• No leakage of air into the hole. 
• The dismantling power is connected opposite to the surface with the goal that the cup does not slide sideways or strip off.

Vacuum suction cups are the connection between the workpiece and the taking care of the framework. They comprise of the suction cup (elastomer part) and an associating component. Festo suction cups are the best in quality.

How do suction cups work?

• A suction cup is produced using delicate elastic that is impervious via air. The cup consists of the curved region under the starting point of it which usually traps air. When we press the suction cup at some level, the air which is caught before gets out and it gets attached to the surface. 

• It will create a vacuum as the air goes out. Since barometrical weight will consistently attempt to adjust itself, air normally fills in any missing holes. The weight will act against the air and it spills out. The air will not enter again. In case, the air is there under the suction cup, the seal will break and the suction cup will fall off.

Types of suction cups – 

Kinds of suction cups go from straightforward, roundabout sorts to those intended for uncommon applications like taking care of sweets, oily sheet-metal boards, or permeable wood and cardboard. They are available in two shapes. 

• Flat suction cups are appropriate for dealing with workpieces with level or somewhat bent surfaces, for example, metal and glass plates, plastic sheets and wooden sheets. Level cups have a little internal volume and, in this manner, empty rapidly and can grasp in an exceptionally brief time. Appropriately planned, they have great security to deal with high shear powers and can withstand powers and increasing speeds from quick mechanized taking care of developments. 

• Apart from this, bellow cups have one convolution. This gives them the idea of holding tightly even on the uneven surface.

Pneumatic tube (or case pipelines; otherwise called pneumatic cylinder transport or PTT) are frameworks that drive tube shaped compartments through systems of cylinders by compacted air or by incomplete vacuum. They are utilized for shipping strong articles, instead of traditional pipelines, which transport liquids.

Pneumatic tube systems picked up acknowledgment in the late nineteenth and mid-twentieth hundreds of years for workplaces that expected to ship little, earnest bundles, (for example, mail, administrative work, or cash) over moderately short separates (inside a structure or, probably, inside a city). A few establishments developed to extraordinary unpredictability, however, were generally supplanted. In certain settings, for example, medical clinics, they stay far-reaching and have been additionally broadened and created in the 21st century.

Few pneumatic transportation frameworks were additionally worked for bigger freight, to contend with increasingly standard train and metro frameworks. In any case, these never picked up fame.