| 摘要 |
A stationery form including a single sheet of printable material that has a self-seal contact adhesive applied to edge regions arranged to contact each other when the form is folded about a crease line. Contacting edge regions are releasably adhered when a first pressure is applied to seal temporarily the form in a folded condition such that the form can be opened and resealed. The contacting edge regions are non-releasably adhered when a second pressure higher than the first pressure is applied to seal permanently the form in the folded condition. Low pressure sealing may be achieved manually, for example by finger pressure. High pressure sealing may be provided with a pressure sealing machine. A permanently sealed form can be opened by tearing along lines of weakness inboard of the adhesive to remove the bonded regions.
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