When choosing a film stretching machine, pre-stretching capacity, film type, stretching rate, specifications, load characteristics and machine type are important factors to consider. Here are some key factors to keep in mind:
Prestretching capacity
The prestretching capacity of the machine determines how much the film can stretch before a load is applied. Higher pre-drawing capacity results in thinner films and less material used. The most efficient machines can prestretch the film up to 400%, while less efficient machines typically have a prestretching capacity of less than 190%.
Film type
There are three main types of stretch film: hand bag, machine bag and super strong stretch film. Each type has application optimization properties that affect slitting and winding processability. It is important to choose a film type that suits your specific needs, taking into account factors such as ultimate stretch, retention, puncture resistance, tear propagation resistance, and adhesion.
Tensile rate
The tensile rate of the machine determines the pressure on the load, which affects the stability of the wrapped tray. The machine can usually be set to stretch a certain percentage of the film, such as 200%, 250% or 270%. The appropriate drawing rate will depend on the weight and characteristics of the load being wrapped.
Specification
The specification of the stretch film refers to the thickness of the stretch film, the thinner the film with low specifications, and the thicker the film with high specifications. It is important to choose a suitable measurement weight and the stability of the load to be wrapped. The gauge range of the pre-stretched film is 25 - 42, and the load capacity range is 1,800 to 4,000 pounds.
Load characteristics
The characteristics of the wrapped load will also affect the selection of the stretching film machine. Loads with sharp edges or uneven profiles may require a different type of film than loads with clean edges and uniform profiles. The weight of the load is also a factor to consider, with lighter loads requiring less force to wrap effectively.
Machine type
There are two main types of stretch packaging machine: power prestretch machine and standard prestretch machine. Power pretensioning machines are more efficient and can handle larger loads, but require the use of standard unstretched films. Standard machines are less efficient, but can be used for a variety of film types. Choosing the right machine type will depend on your specific operational needs.
Stretch Film Roll Machine
By taking these factors into account, you can choose the stretched film machine that suits the specific needs of your operation. Keep in mind that there is no one-size-fits-all solution and it may be necessary to try different machines and film types to find the best fit.
