| 摘要 |
<p>The envelope is sealed using thermo sealing paper to close the documents. The paper is either thermo sealing over its entire surface or in strips in the direction of motion of the paper during sealing. The sealing may be effected by an automatic printer or typewriter. The sealed envelopes may be opened by tearing along a perforated edge in the envelope, and is suitable for large quantities of documents. The documents are enclosed and sealed in an envelope which may be folded over into sections to keep documents separate.</p> |
