Reasons why New Tires have Thorny Parts Outside

New tires usually have thorny parts. But why are they there or for some reason they are kept out.

The thorny rubber parts on the outside of the tire are called vent spray. Which can be seen in the new tires. They are not made intentionally or they do not enhance the performance of a tire. These are made while curing a tire.

Tire curing is a method in which green tires made of soft rubber are fortified by vulcanizing with pressure and heat and the tires are brought to a final form.

Here are the things to look for when curing a tire:

•Tire mold is a mold made of metal. It can be separated into two or more parts and the mold is restored by inserting the green tire and attaching the parts.
•The other is green tires. The parts used to make tires, such as beads, rubber plywood, steel belts, etc., are assembled to give the tire an initial appearance. Green tires stay inside the mold when curing. Green tire rubber is soft.
•Tire curing bladder made of rubber. When curing, the bladder is inserted into the green tire.
•The tire curing process takes place in a tire curing press. This process involves injecting hot water or steam into the bladder and applying high pressure and heat to the green tire so that the green tire takes on the shape of a mold.

During the final process some amount of air gets trapped between the green tire and the mold and if this air is not expelled then some defects are formed in the manufactured tire. Some tiny holes are made in the mold to allow air to escape. These are called spray holes or vent sprays. When the cue tries to get out with some rubber spray hole along with the air under extreme pressure and heat so we can see the vent spray on the made tire.

Source: quara.com, zoombangla.com