The difference between cast and blown stretch wrap is significant. Cast stretch wrap is made from linear low-density polyethylene (LLDPE) that is melted and then extruded through a die to form a film. The blown process also uses LLDPE, but in this case, the polymer is melted and then blown like a balloon to form a bubble. This bubble is then cooled and collapsing to form a film.
The main difference between the two processes is the amount of stretch that the final product can withstand. Cast films have a higher stretch limit than blown films. This is due to the fact that the molten polymer in a cast film evenly coats the die, resulting in a more consistent film. In contrast, the blown process creates an uneven distribution of polymer on the die, which leads to a film with a lower stretch limit.
Additionally, cast films have a higher puncture resistance than blown films. This is because the cast process creates a more compact and dense film. The blown process, on the other hand, creates a film with a more open and loose structure.
Finally, cast films tend to be more clear than blown films. This is due to the fact that the molten polymer in a cast film has a lower viscosity, which allows for a more even flow and distribution of the polymer. In contrast, the blown process creates a film with a higher viscosity, which leads to a more opaque film.
Frequently Asked Questions
What is the difference between stretch wrap and cast film?
Cast film is made of a polymer material that is heated and then injected under pressure into a mold, which creates the desired stretch. Stretch wrap, on the other hand, generally uses a cellulose film base that is stretched over an object by hand.
What is the difference between blown and cast film?
Blown film has more air in it, which makes it stretch further. Cast film is made without air, which means it will not stretch as much and can cover less pallets.
What is the difference between blown and blown stretch wrap?
Blown stretch wrap has a much higher degree of memory than blown film.
What is blown stretch film?
Blown stretch film is a type of flexible packaging made from a polymer resin that has been blown into a tube-shaped piece. The tube is then cut down to size and usually sold in rolls. Generally, it’s used to wrap packages and items such as clothing, furniture, or even flowers.
What is the difference between blown and cast Stretch wrap?
B blown and cast stretch film offer different qualities. Cast Stretch Film offers increased clarity allowing users to see wrapped products. Cast stretch wrap unwinds quietly compared to blown stretch wrap. Cast stretch film offers two-sided cling that allows the wrap to stay securely packaged. Disadvantages of Cast Stretch Film- Does not offer the load/holding power blown stretch film provides.
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