Why doesn't the tape trick work with scotch tape?

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SUMMARY

The tape trick, which involves folding and quickly pulling apart tape to achieve a clean tear, does not work effectively with 3M's Scotch tape, specifically the 3/4 inch "Magic™ Office Tape." This type of tape exhibits high elasticity, causing it to snap back to its original shape rather than tearing or stretching. The discussion highlights the unique material properties of Scotch tape that differentiate it from other tapes, such as packing tape, which allows the trick to work successfully.

PREREQUISITES
  • Understanding of tape material properties, specifically elasticity and tensile strength.
  • Familiarity with different types of adhesive tapes, particularly 3M Scotch tape variants.
  • Basic knowledge of practical engineering techniques for material manipulation.
  • Experience with hands-on demonstrations of adhesive products.
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  • Research the material composition of 3M Scotch tape and its various types.
  • Explore the physics of elasticity in materials and how it affects adhesive performance.
  • Investigate alternative methods for cutting or tearing different types of tape.
  • Watch video demonstrations of tape manipulation techniques to understand practical applications.
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This discussion is beneficial for engineers, DIY enthusiasts, and anyone interested in the practical applications and limitations of adhesive tapes, particularly in crafting and packaging scenarios.

Twigg
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Mods, I know "General Engineering" hardly describes this question, but it doesn't seem to fit anywhere. Move it where you wish.

There's a trick that works with most tape (especially packing tape), where you fold the tape on itself, make a crease, then pull the creased tape apart quickly. The tape will tear neatly apart, and it spares you the effort of finding a pair of scissors. For a video demo, check out "method 3" of this video.

Today, I tried to show off to a coworker using this trick to tear scotch tape, and I made a big ol' fool out of myself. I know I can do it with most kinds of tape. What gives? Is scotch tape more elastic? Thinner? What parameters do you all think are critical? My dignity is at stake here :cry::oldbiggrin:
 
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Twigg said:
scotch tape
Could you please give more details? I could not find anything conclusive about the material or function of this particular tape type.
 
Also, 3M makes a zillion kinds of tape, all branded "Scotch".
 
Sorry about that. Should've known better than to post right before bed.

3/4 inch "Magic^TM Office Tape" under the Scotch brand.

What I observed was that the tape wouldn't tear, it wouldn't even plasticly stretch, it would just elastically snap back to its original shape and resist the pull.