The following is a list of stretch film terms to know. How to load goods and using stretch film efficent? What purpose of using top sheeting, top sheet dispenser,… You will fully understanding these terms after reading this article.
Force Load
Force to load varies by number of wraps, gauge being used, force to load settings on machine, pre-stretch level of machine. The most typical force to load seen is 15-26 lbs in the field.
Gauge
A unit of measurement that is used to measure stretch film thickness or caliper. An example value would read as: 40 gauge, 60 gauge or 100 gauge. Also note: Often used as a synonym for film thickness.
Hand Wrap
Stretch film designed to be post stretched or tensioned stretched by personnel without equipment is called hand wrap. Typically hand wrap does not have the stretching abilities of machine wrap and is wound on smaller and lighter rolls for easier manipulation. Designed for hand wrapping application, hand film rolls are lighter and smaller than machine film rolls to make application easier.
Load Types – A-load, B-Load, C-Load
Stretch film and machine manufacturers have divided the types of loads wrapped into three load types based on the degree of difficulty to wrap the load or product.
A-Load: Is the simplest of the load types. Usually a std. pallet with no sharp edges, clean sides without obstructions that may interfere with the application of the stretch film
B-Load: This load type may have less uniform vertical and horizontal edge profiles than Type A loads. While they are likely all boxes, the load pattern is irregular and may not match the size of the pallet deck.
C-Load: The most difficult type of load. It may be unstable, with sharp corners that may have an effect on speed
A, B, C loads
Load Diagonal
Is the measurement of a pallet or product load across the diagonally opposite corners. This dimension is critical in determining the overall size of a stretch wrapper. The difference in this dimension in the largest load to be wrapped and the smallest can also effect how the machine needs to be designed. The equation for determining a load diagonal of any pallet is (L2 + W2).
Tear Resistance
Refers to the resistance of the film to tear. Attribute is quantified by measuring the force needed to propagate an initiated tear. Tensile Strength Tensile strength a measurement of the maximum amount of force a material can take without breaking. The greater the tensile stretch measurement, the stronger the material.
Tension Stretch
Tension stretch (or post stretch) is the method of stretching the film by pulling (or tensioning) while the film is applied to the pallet. Although this increases the film force, the load being wrapped limits this tension. Empty PET bottles or light boxes will be crushed or damaged by high-tension stretch. Layers of product can be swept of a pallet and film breaks also increase as the tension stretch is increased.
Top Sheet Dispenser
Top sheet dispenser is a piece of equipment that applies a poly sheet of plastic top sheet to the top of a load to provide a water resistant layer. Typically, once applied, a top sheet is subsequently wrapped with stretch film to secure it in place. The top sheet film is unrolled, cut to size, and applied to the load automatically by the top sheet dispenser.
Top Sheet Film
Is the poly plastic film that is applied to the top of the load
Top Wraps
Top wraps are the extra revolutions of stretch film applied to the top portion of the load to be wrapped. As the top layers are susceptible to shifting in transit extra layers of stretch film (top wraps) is applied. These extra revolutions are typically set using the top wrap counter located on the control panel.
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