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Why do rubber parts stick out like thorns in a new car tire?

Why do rubber parts stick out like thorns in a new car tire?

Why do rubber parts stick out like thorns in a new car tire?


You are talking about the cuts like the picture above. These are called Vent Spew. New tires can be seen. They are not made intentionally or they do not increase the performance of a tire. These are made when curing a tire.

Tire curing is a method in which green tires made of soft rubber are hardened by vulcanizing with pressure and heat and the tires are finalized.

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Tire mold:
Why do rubber parts stick out like thorns in a new car tire?

It is a mold made of metal. It can be separated into two or more parts and the tire is inserted into it and the parts are joined together to bring the mold back to its original position.
Why do rubber parts stick out like thorns in a new car tire?

This is the green tire. The parts used in the manufacture of tires such as beads, rubber plywood, steel belts, etc. are assembled to give an initial shape to the tire. Green tires are inside the mold when curing. Green tire rubber is soft.
Why do rubber parts stick out like thorns in a new car tire?


It is a 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. In this process, hot water or steam enters the bladder and high pressure and heat is applied on the green tire so that the green tire gets moldy shape and immediately vulcanizes and gets the shape and strength of the tire.

During this process, some amount of air gets trapped between the green tire and the mold. And if this air is not expelled, some defects are formed in the tire. These are called spew holes or vent spruce. When curing, the pressure and heat of the air tries to get out through the hole with some rubber spew so we can see the vent spew in the made tire.
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