1.Is zinc toxic?
Zinc dissolves in acidic or alkaline conditions. Many foods (such as tomatoes, lemon juice, vinegar, and carbonated beverages) are acidic, which can cause zinc ions to migrate into the food.
Although zinc is an essential trace element for the human body, excessive zinc intake can cause acute toxicity (symptoms include nausea, vomiting, abdominal pain, and diarrhea).
Long-term excessive zinc intake can also interfere with the body's absorption of other trace elements, such as copper and iron.
2.What are the physical properties of the zinc coating?
The galvanized surface is not completely dense and non-porous; it may contain tiny pores that can harbor bacteria and make thorough cleaning and disinfection difficult.
The galvanized layer is relatively soft, and zinc dust or particles can break off and contaminate food if rubbed or scratched.
3.What are the applicable scenarios of galvanized coils in the food industry?
Non-direct contact areas/structural components:
Equipment external frames, housings, and protective covers.
Conveyor line support structures (however, belt contact surfaces conveying food should be made of stainless steel or food-grade plastic).
Ventilation ducts and dust collection systems (areas not in direct contact with food).
Warehouse shelves, platforms, stairways, etc.
Use under specific conditions (extreme caution is required):
For the storage or transportation of dry, neutral foods (such as grains, flour, and sugar) at ambient temperature, the risk is relatively low. However, for the most stringent food safety requirements, the use of more inert materials is still recommended.
4.What are the recommended materials for food processing equipment?
Austenitic stainless steel: This is the absolute mainstream choice.
304 stainless steel: The most commonly used, with excellent corrosion resistance and processability.
316 stainless steel: Contains molybdenum, offering enhanced corrosion resistance, especially against chloride corrosion. Suitable for high-salt and high-acid environments or where frequent cleaning with chlorine-containing disinfectants is required.
Food-grade aluminum alloy: Used for certain components where weight is a concern.
Food-grade plastics: Such as PP (polypropylene), PE (polyethylene), and PTFE (Teflon), used in seals, conveyor belts, containers, and more.
5.In what scenarios is galvanized coil recommended?
The equipment's external structure and protective cover fully utilize its rust-resistant and economical features, and are safe and non-contact with food.