ENVELOPE SEAL,SEAM AND WINDOW PATCH TESTING

• This method describes procedures for evaluating the following properties of envelopes : (1) film thickness of seal, (2) seal, seam, and window patch adhesion, (3) humidity resistance, (4) discoloration and staining of seal, seams, and patch.
• The functionality of an envelope may be impaired if the adhesion characteristic between paper surfaces is impaired due to the changing environment to which the envelope is subjected.
• These test procedures are useful for the comparison of envelope quality.
• The precision statement in TAPPI T 411 is applicable for dry adhesive film thickness.

It Provides information on:

• Reagents
• Test specimens
• Keywords