Shrink Wrap VS Stretch Wrap

What is shrink wrap?

Shrink wrap: Shrink wrap is a wrapping technology that uses shrink film to wrap objects (or inner packages), and then heat the film properly so that the film shrinks and sticks to the objects (or inner packages).

Shrink film is a kind of specially polyethylene film of the drawing and cooling process, due to shrinkage film produced when directional tensile residual stress, the stress under a certain heat will be eliminated, so that the transverse and longitudinal contraction, at the same time increase the thickness of the film, shrinkage rate is usually 30% to 70%, a maximum contraction force in cooling stage, And can maintain for a long time.

In the process of plastic film manufacturing, the molecular oriented film is stretched and cooled at the temperature above the softening point. When it is reheated, it has the tendency to return to the state before stretching. Shrinkage packaging is developed by using the thermal shrinkage performance of plastic film.

The size of the appropriate heat-shrinkable film is covered outside the packaged goods, and then heated briefly with a hot air oven or hot air spray gun, the film will immediately shrink, tightly wrapped in the outside of the goods. Packaging items can be single pieces or in an orderly arrangement. See cans, bottles, cartons, etc.

The use of shrink machine for packaging plays a very good beautification and practicality, the use of environmental and human pollution-free, recyclable reuse or renewable packaging materials and products of the packaging is called green packaging.

Stretch packaging if the use of manual operation, generally put the packaging in a shallow tray, especially soft and brittle products, if not tray is easy to damage. Multiple packaging of scattered products also need to tray, but the product itself has a certain rigidity and strength can also be used when the tray.

If part or all processes in stretch packaging are mechanized or automated, labor can be saved and production efficiency can be improved. The main links of automatic stretch packaging are winding and stretching. Now there are mechanical equipment to fully mechanize these processes.

From a large scope, wrapped film packaging and heat shrinkable packaging are part of the film packaging series, but their packaging field and packaging products have a very big difference, many customers for the first time may not be very understand, the following AI information and you share the main differences between wrapped film packaging and heat shrinkable packaging.

1.Different devices used. There is no doubt that winding film packaging uses winding packaging machine, and heat shrinkable packaging uses heat shrinkable packaging machine, and heat shrinkable packaging has a heating process, but winding packaging does not.

2.packaging items of different sizes. Wound packaging is generally used for large items, such as luggage, pallets, pallets and pallets. Heat shrinkable packaging, on the other hand, wraps relatively small items, such as disposable tableware, facial mask boxes, mobile phone boxes, etc.

3.Different packaging effects. Wrap packaging can not only play the role of waterproof and moisture-proof, but also play a certain role of fastening, prevent the goods loose in the process of transportation. But winding packaging has a disadvantage that the transparency is not good. The transparency of the heat shrinkable packaging is very good, but it can not be fastened, and it can only play a simple waterproof and dustproof role.

What is stretch wrap used for？

Stretch film is a commonly used packaging material, which can be manually packaged or packaged with a pallet wrapping machine. Stretch film has a good packaging effect, which can play a role in preventing moisture, dust, corrosion, and scattering. It is a better packaging method. So, which industries are the stretch films mainly used in? Generally speaking, the industries that will use stretch film include food and beverage, printing industry, wood flooring, cosmetics, ceramics and electrical machinery, etc., especially for the packaging of some small parts, which can effectively prevent scattering and cost-effective.