Corrected version:

The diagram depicts the process of manufacturing instant noodles. 

Explanation: 

The word "a" is unnecessary in this sentence. The word "process" is already plural, so there is no need to specify that there is only one process.

Improved version:

The diagram illustrates the steps involved in the manufacturing of instant noodles.

Corrected version:

 While the process has 8 different stages. 

Explanation: 

The word "have" should be "has" because the process is singular.

Improved version:

The process consists of 8 different stages.

Corrected version:

Firstly, floor is stored in storage silos for making instant noodles. From there, it is sent to a mixing machine to add oil and water to make it soft.

Explanation: 

The word "floor" should be "flour" because flour is used to make instant noodles, not floor. The word "sended" should be "sent" because the past tense of the verb "send" is "sent."

Improved version:

First, floor is stored in storage silos for the purpose of making instant noodles. It is then sent to a mixing machine, where oil and water are added to make it soft.

Corrected version:

Secondly, the dough is passed through rollers to make sheets. These sheets are then divided into strips. 

Explanation: 

The word "throught" should be "through" because the word "through" is a preposition that means "in one side and out the other." The word "was" should be "is" because the dough is still being passed through the rollers. The word "sheets" should be plural because there are multiple sheets of dough.

Improved version:

Second, the dough is passed through rollers to form sheets. The sheets are then cut into strips. 

Corrected version:

On the fifth stage, the strips are molded into a circular shape. This stage is known as noodle discs. 

Explanation: 

The word "trips" should be "strips" because the strips of dough are being molded into a circular shape. The word "was" should be "are" because the strips are still being molded. The word "this" should be "the" because the stage is already known as "noodle discs." 

Improved version:

On the fifth stage, the strips are molded into a circular shape, a process known as noodle disc formation.

Corrected version:

Furthermore, the noodles are dipped in hot oil to make them crunchy and hygienic. The high temperature kills about 99.9% of bacteria. 

Explanation: 

The word "it" should be "the noodles" because the noodles are being dipped in hot oil. The word "need" should be "kills" because the high temperature kills bacteria, not needs bacteria. 

Improved version:

Furthermore, the noodles are dipped in hot oil to make them crunchy and hygienic. The high temperature kills about 99.9% of bacteria, ensuring a safe product.

Corrected version:

Interestingly, spices and vegetables are added to enhance the flavor and aroma of the noodles. 

Explanation: 

The word "Interestingly" should be capitalized because it is the beginning of a sentence. The word "the" should be added before the word "noodles" because the spices and vegetables are being added to the noodles. 

Improved version:

Interestingly, spices and vegetables are added to further enhance the flavor and aroma of the noodles. 

Corrected version:

On the other hand, cups are filled with noodles. The cups are then labeled and sealed to increase the lifespan of the instant noodles. 

Explanation: 

The word "side" should be "hand" because the cups are being filled with noodles on the other hand. The word "was" should be "are" because the cups are still being filled. The word "last" should be "final" because the labeling and sealing of the cups is the final stage in the manufacturing process. 

Improved version:

On the other hand, the cups are filled with noodles, labeled, and sealed to increase the lifespan of the instant noodles.