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Canning and Food Preservation

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Questions and Answers

What is the primary purpose of the inner cans in food preservation?

To protect the food from reaction to prevent spoilage (correct)

To increase the shelf life of the food

To add color to the food

To enhance the taste of the food

What type of fruits are characterized by the 'R' type of inner can?

Tropical fruits like bananas and mangoes

Citrus fruits

Berries like strawberries and blueberries

Colorful fruits like beets and cherries (correct)

What is the primary component of the 'black sulphide' used in food sterilization?

10% copper

5% gold

20% silver

15% zinc (correct)

What is the purpose of the resin in the coating of the inner can?

To provide oxidation resistance Signup and view all the answers

What is the name of the type of inner can used for meats and seafood?

Phenolic type Signup and view all the answers

What is the main benefit of using the epoxy type of inner can?

It provides good temperature resistance Signup and view all the answers

What was the material used in the coating of the inner can before the introduction of corn enamel?

Verzineal Signup and view all the answers

What is the primary consideration for using the 'C' type of inner can?

To prevent bad color formation in foods like peas and chickens Signup and view all the answers

What is the purpose of adding epoxy to phenolic?

To modify the coefficients of phenolic Signup and view all the answers

What is the recommended type of food to use with vinyls?

High-fat foods Signup and view all the answers

What is the maximum temperature that vinyls can tolerate?

95°C Signup and view all the answers

What is the purpose of coating tin sheets?

To provide a degree of heat Signup and view all the answers

What is the thickness of the coating used in Shrou C?

0.0025 to 0.0127 millimeter Signup and view all the answers

What is the type of poly used in Polyboomer (PET)?

Demi-ride poly and amorphous crystalline state Signup and view all the answers

What is the purpose of using Polyethylene tephthalate and propylene (PET)?

To make steel tins Signup and view all the answers

What is the result of using epoxy modified with vinyl?

A modification of the material's properties Signup and view all the answers

Study Notes

Inner Can Coatings

Inner cans are coated with tin, which is divided into several types for different uses.
The coating prevents corrosion and reaction with food.

Types of Coatings

A. Verzineal Coating

Used for "R" type fruits, which are characterized by protection of the fruit and retention of color.
Contains 15% zinc and is used to prevent bad color.
Used for products with high color retention, such as beet and cherry.

B. Phenolic Coating

Used for some types of meat and seafood, canned food, due to the inadmissibility of Zanfu and Rood.
Has flexibility and is used for vegetarians, as it does not affect the taste and aroma of food.
Has lower resistance to oxidation than inherited fats.

C. Epoxy Coating

Has good temperature and resistance to soldering operations.
Used for cans that require high temperature resistance, such as for vinyl products.

D. Vinyl Coating

Has high corrosive properties and is used for high-fat foods.
Used in combination with epoxy to enhance properties.

E. Polymeric Coating (PET)

Used to make steel tins and has a demi-ride poly and amorphous crystalline state.
Can be used in different types of bags, such as Shrou A, Shrou B, and Shrou C, each with its own properties and uses.
Thickness of the coating can vary from 0.0025 to 0.0127 millimeter to 3 to 9 millimeter.