Web-type multiple-part business form stock having pre-glued but non-adhered cross-web heat seal glue lines designed for activation to seal outgoing envelopes after printing-type personalization of potential forms thereof

Abstract From the Canadian patent

In a web-type multiple-part business form stock having a succession of serially connected potential outgoing envelopes each containing one or more intermediate layers which may be withdrawn from the outgoing envelopes after the outgoing envelopes are received and opened by an addressee, the hitherto conventionallyused cross-web lines of cold glue used for defining the two opposite edges of the internal spaces of the potential outgoing envelopes is replaced by cross-web band paterns of hot melt adhesive applied in a customery location but left attached only, to the web surface to which it was applied and which is not heat, activated and used to adhere the respective webs together until after …