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Questions and Answers
What is the main purpose of chromium coating on steel?
What is the main purpose of chromium coating on steel?
- To improve thermal insulation
- To enhance electrical conductivity
- To increase tensile strength
- To prevent atmospheric oxidation (correct)
Which statement about pure aluminium is accurate?
Which statement about pure aluminium is accurate?
- It undergoes no change when exposed to water.
- It is impervious to corrosion.
- It is attacked by most dilute acids. (correct)
- It is resistant to all types of acids.
What is a characteristic of metal cans used for food packaging?
What is a characteristic of metal cans used for food packaging?
- They have no size limitations. (correct)
- They are prone to rusting.
- They can only be used for dry foods.
- They are expensive compared to alternatives.
What disadvantage is associated with soldered seams in metal cans?
What disadvantage is associated with soldered seams in metal cans?
What is a primary reason for coating steel with chromium in the context of food packaging?
What is a primary reason for coating steel with chromium in the context of food packaging?
Which of the following best describes the shelf life of canned foods?
Which of the following best describes the shelf life of canned foods?
What is a requirement for reproducing or transmitting this material?
What is a requirement for reproducing or transmitting this material?
Why is lacquer adhesion important in the context of coated steel?
Why is lacquer adhesion important in the context of coated steel?
How does a welded seam differ from a soldered seam in food cans?
How does a welded seam differ from a soldered seam in food cans?
What are Class II can defects associated with?
What are Class II can defects associated with?
What is the purpose of determining can size?
What is the purpose of determining can size?
Who can access this material for reproduction?
Who can access this material for reproduction?
What type of defects does Class III refer to?
What type of defects does Class III refer to?
What is the primary purpose of exhausting filled containers before processing?
What is the primary purpose of exhausting filled containers before processing?
Which benefit is NOT associated with creating a vacuum in food containers?
Which benefit is NOT associated with creating a vacuum in food containers?
How does steam play a role in the vacuum production process?
How does steam play a role in the vacuum production process?
What is one of the consequences of not exhausting air from a food container?
What is one of the consequences of not exhausting air from a food container?
Which method is NOT mentioned as a way to produce a vacuum?
Which method is NOT mentioned as a way to produce a vacuum?
What happens to the can ends or jar lids during thermal processing?
What happens to the can ends or jar lids during thermal processing?
What is the purpose of reducing the quantity of oxygen within the container?
What is the purpose of reducing the quantity of oxygen within the container?
What is one way a vacuum helps in the preservation of food within a container?
What is one way a vacuum helps in the preservation of food within a container?
What is the primary function of the double seam in tin plate cans?
What is the primary function of the double seam in tin plate cans?
Which part of the can is associated with the formation of a double seam?
Which part of the can is associated with the formation of a double seam?
What can be a consequence of improper sealing in tin plate cans?
What can be a consequence of improper sealing in tin plate cans?
What characteristic defines a hermetic seal in canning?
What characteristic defines a hermetic seal in canning?
Why is the material of the can body crucial in preventing food spoilage?
Why is the material of the can body crucial in preventing food spoilage?
What is the main reason for using tin plate as a material for food cans?
What is the main reason for using tin plate as a material for food cans?
What defines the term 'canned food spoilage'?
What defines the term 'canned food spoilage'?
Which method is emphasized in the sealing of tin plate cans to prevent spoilage?
Which method is emphasized in the sealing of tin plate cans to prevent spoilage?
What does net weight represent in the context of packaged products?
What does net weight represent in the context of packaged products?
What is tare weight in relation to a packaged product?
What is tare weight in relation to a packaged product?
What is the fill weight of a product?
What is the fill weight of a product?
What is the purpose of accurate and uniform filling of food products?
What is the purpose of accurate and uniform filling of food products?
What the % Net Weight Deviation formula used for?
What the % Net Weight Deviation formula used for?
At what temperature should the standard fill of container be maintained?
At what temperature should the standard fill of container be maintained?
What does drained weight refer to in food measurement?
What does drained weight refer to in food measurement?
Why is filling important in food packaging?
Why is filling important in food packaging?
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Study Notes
Aluminum and Corrosion Resistance
- Pure aluminum is vulnerable to attack by most dilute acids.
- Chromium coatings on steel (ECCS) improve resistance against atmospheric oxidation and corrosion.
- Chromium prevents sulphur staining from foodstuffs, enhancing lacquer adhesion for steel packaging.
Metal Cans and Food Spoilage
- Metal cans are primarily utilized for food packaging and are regarded as economical and reliable.
- The structure of metal cans includes soldered and welded seams for maintaining integrity.
- Soldered seams allow for no size limitations and exhibit strong resistance to abuse, while welded seams eliminate lead contamination.
Tin Plate Cans
- Tin plate cans feature a double seam that interlocks the cover and body, creating a hermetic seal.
- The double seam ensures long shelf-life and prevents food spoilage.
- Can defects are classified into two categories: Class II and Class III, noting quality control measures in manufacturing.
Can Size Determination
- Determining can size plays a crucial role in product development and consistency in filling.
- Correct dimensions are necessary for ensuring proper fit and function in packaging processes.
Exhausting Process in Canning
- Exhausting removes air from containers before processing, reducing stress during thermal processing.
- A vacuum aids in maintaining can ends in a concave position, visualizing the container's condition.
- This process minimizes oxidative changes in food by reducing the quantity of oxygen present.
Measurement Standards in Canning
- Gross weight includes the packaged product and the container; net weight is the content without the tare weight.
- Tare weight corresponds to the container's weight, whereas fill weight accounts for the solid portion of the product prior to processing.
- Drained weight indicates the solid content weight post-thermal processing, essential for quality assurance.
Filling Standards
- Standard fill temperatures are set at 85 °C (185 °F), with a target to achieve at least 90% of the can's water capacity.
- Accuracy in filling ensures consistent product weight and uniformity in packaging.
Ensure Compliance
- All materials used in creating study notes are proprietary and intended for personal use, requiring consent for reproduction or distribution.
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