What causes stringy or filamentous plastic residue at the seal-and-cut area of shrink film in heat shrink packaging, and how can it be resolved?

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  Stringy or filamentous plastic residue at the seal-and-cut area during heat shrink packaging:

  This issue appears as thin strands of melted plastic stretching across the film at the seal line. Common causes include insufficient sealing temperature, uneven clamping pressure, or conveyor speed that is too fast.
  
  

  Solutions for stringy plastic at the seal-and-cut area:

  • The sealing knife temperature on the seal-and-cut machine is too low—increase the sealing temperature to ensure clean, complete melting and separation of the film.

  • The sealing time is too short—extend the dwell time to allow the seal to fully form and prevent molten plastic from stretching into filaments during cutting.