It is sometimes convenient to categorize packages by layer or function: primary, secondary, etc. 1  Primary packaging is the material that first envelops the product and holds it. 2  Secondary packaging is outside the primary packaging, and may be used to prevent pilferage or to group primary packages together.
Does Corn Need To Be Refrigerated? Corn does not typically need to be refrigerated in order for it to be safe to eat. You will want to be aware of the fact that the longer you keep your corn in the refrigerator, the more flavor and vitamins you will lose, so it will not have quite as much nutritional value or taste to it.
Fresh or raw corned beef is usually sold vacuum-packed in brine with a sell-by date. It may be refrigerated in the package up to seven days beyond the sell-by date. Similarly, if you make your own corned beef, it should be tightly wrapped and stored five to seven days in the refrigerator.