MD is shortened for Machine Direction, while TD is for Transverse Direction (also known as CD or Cross Direction). Depending on the manufacturing process, stretch film might have different tensile strength value in its TD and MD due to how its molecule is aligned.
Cast stretch film has higher tensile strength in MD, while blown film despite of the higher cost to manufacture, does have a more balanced molecular orientation which in turn making the stretch film tougher in both directions.
Then again not everyone needs their film to be strong in both TD and MD, since it will not be cost efficient. As shown in the image above, most of the time MD is the measuring benchmark for stretch film.
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