The package is a material that is able to keep the structure and shape of the product, facilitate the transport, protection, and preservation of the product, and also allow the handling. The area of use of package is very wide. Almost everything from food to furniture, medicine to jewelry can be packaged. Packaging is an all area of everyday life. Many materials such as glass, paper, plastic, cellophane, bakelite, tin, wood can be used as packaging. The packaging of previously packaged one or more products is called shrink packaging. This process, which is done with the shrink wrap machine is carried out by wrapping the around of the product or the products previously packaged by a different method. The plastic film wrapped around the product in the shrink packaging process shrink with the heat effect and takes the shape of the product wrapped around it.
The shrink wrap machine performs the packaging process in two stages.
The product will be wrapped with the plastic film and the film wrapped around the product is stitched with the welding machine.
The product will be sent to heat tunnel where heat will be given to the plastic film that is wrapped and stitched around the product in order to shrink.
Shrink wrap machines that keep and maintain the product have many different purposes and benefits of the product.
- Making multiple packages a single package.
- Ensure to keep the product clean.
- Prevent unwanted opening of packaging.
- Increase the resistance of the product to external factors.
- Prevent the spoil of food products by preventing the moisture.
- Show that the product is never used and the buyer is the first user.
- Preservation of paper products such as magazines and newspapers and print or label on it if necessary.
- Show the product inside thanks to its transparency.
- Shrink packaging, which is useful for storage, transportation, and protection offer different packaging options according to the type, structure, and shape of the product.
Packing Method with Shrinking Film
In this packaging type, the used plastic film has a shrinking structure. This material tightly wraps around the product it is covering and takes the shape of the product when heat is applied to it. The heating process in small size products carried out with electric or steam powered machines and they are carried out with heat tunnels in large size products.
Packing Method with Plastic Film
In this packaging type, the plastic film is wrapped around the product and tightly sealed with a machine that provides gumming with tape, adhesive or steam.
Packing Method with Stretch Film
Stretch rates of stretch films are more than plastic films. The stretch film immediately covers and sticks to the product wrapped around it. This is why no other heat application is required to make it stick. Stretch film application is especially suitable for the packaging of food products.
Shrink films have two most commonly used types by application area.
Polyolefin Shrink Film
It is the most widely used type of plastic film since it is compatible with the use of the shrink wrap machine and it is a strong and durable material. Large-scale enterprises particularly prefer this material for packaging needs and it has a widespread use due to its resilience and it keeps up with fast working tempos. The problem-free application can be achieved even in the most difficult shrink packaging operations. In addition, in heat applications, it does not release harmful gasses, extends the shelf life of the product. It keeps the product intact during the time from the first package to last buyer. Thanks to its cross-linking it makes the most difficult packing tasks easier. Also, it can be used comfortably even in the packaging of foodstuffs such as bread since it is a healthy material. There is no problem with the contact with food ingredient. It is especially used in products with display purposes, should have visuals, has grouping needs, advertising, and promotional items. Also, if needed, it can be used as the first or second packaging.
Polyethylene Shrink Film
It is a material which can take the stretch state that is produced as a single layer and when sufficient heat is applied. It is also called a memory film because of the ability to reinstate when it meets with the production heat. It is mostly used in the packaging of pallets, tins, cardboards and beverages.
In general, frame or bubble methods are preferred in large commercial size packagings.
Shrink films can also be used for very large size industrial products to be applied on the same heating and cooling operations. Among them, there are materials used in building and bridge construction, large volume packagings used in storage, sea boats or other maritime vehicles, heavy but sensitive materials carried by a pallet. Shrink films can achieve flexibility in two or single directions. The state of the film during the production is shrunk with heat and the desired shape will be given. When cooled again, the material will be fixed as desired. It can take its original state when it is reheated. This means that it has a molecular structure which can be shaped by heating it and it stay in its new form when it is cooled that allow it to not have any limitation in terms of using them in any product and product diversity. At the same time, this feature makes the shrink films that can be easily recycled. Mostly shrink packaging is carried out with special equipped and automatic shrink machines. The shrink film roll placed in the machine is opened thanks to the shrink wrap machine. On the other side, the product to be packed is placed in the machine. While a machine is opening the shrink roll, it also provides heat to the product that will be packaged. Shrink film wraps around the product and takes the shape of the product with the effect of the provided hot air.
Well, how to check if Shrink Wrap Machine carries out a good packing and how to ensure it?
To understand this, there are few points that you need to pay attention.
Stitches for joining should be uniform and equally spaced after packaging.
You must be sure about the degree of the heat for the type of shrink film you are using.
You need to pay attention to keep the shape of the product that is provided while passing from the heat tunnel after the packaging process completed.
You should make sure that the system that opens the tiny holes operates that ensures the air remaining inside is protected and the protection is increased after packaging.
You should be sure that the air inside the product comes out after packaging. When packaging is over the air must become out at the same time. If the air is not released, this indicates that this operation is not performed correctly.