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Shrink Wrapping

Protecting the integrity of any product, be it consumables, food or perishables is a major concern in today’s global civilization. More than at any time in the past, we divide production and specialization of food and manufacturing to the farthest regions and transport them across long distances and spanning days, in some cases. Without the ability to seal in the freshness and seal out the contaminants, this method of effective distribution would grind to a halt. One of the proven ways to maintain the integrity of any product is by using of shrink wrapping Companies.

 

How Does Shrink Wrapping Work?

 It uses a polymer sheet similar to plastic transparent wrappers. These sheets are made from a specific polymer that reacts in a predictable way when a certain level of heat is applied. The molecules in the polymer arrange themselves in a certain way when it is heated than when they are cooled the remain in that form until reheated. Once reheated they return to the original shape. This makes them ideal for shrink wrapping.

Where is it Used?

It is used everywhere that needs protection from the atmosphere and moisture. from small containers of food, to drinks and even to larger items like mattresses and even thinks as big as cars and boats. Off course not all of them use the same polymer. The larger items like cars and boats and even building, sometimes, use a co-polymer. This co-polymer for heavy items uses EVA, or ethylene-vinyl acetate, and it is slightly thicker than the polymer used to warp foods and toys.

Technical Issues

There are two kinds of shrink wrapping material, one that can be only shrink in one direction, and another that can be shrunk in both directions (mono or bi-directional). The polymer film is made by heating then stretching it. Once it is stretched the  film is cooled and it retains its current stretched shape. This is the shape the it is in when it is rolled and ready to be used.  When the time comes for it to protect a product, the polymer is stretched over the product then heated. When it is heated, the molecules begin to realign and return to its original shape which is the pre-stretched version of itself, this then allows it to assume the shape of the underlying object.

When products are heat treated there are numerous benefits that ensue. Most importantly the product is protected from the elements of the environment. Especially moisture. In most cases it is is even possible to protect the object from microbes and microscopic particles. Cheese is sometimes wrapped this way and that results in longer lasting shelf-life. Off course it is not guaranteed that a product that is protected in this way can last forever, there are instances where contaminants are packaged along with the product and that leads to the destruction. In cases where the product is wrapped, then vacuumed under heated conditions then wrapped the possibility of contamination is lower.