Panasonic KX-P8420 - Manual (Page 211)

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Appendix
• Highly textured envelopes, or with extremely shiny surfaces
• Envelopes that seal by removing a peel-off strip
• Envelopes with more than one flap to be sealed
• Self-adhesive envelopes
• Envelopes that are baggy or not sharply creased
• Embossed envelopes
• Envelopes that have previously been printed on
Do not attempt to print on any of the following types of envelopes. These
may cause damage to your printer.
• Envelopes with clasps, snaps or tie strings (as illustrated on left below)
• Envelopes with transparent windows (as illustrated on right below)
• Envelopes that will melt, discolor, scorch offset or release hazardous
emissions when exposed to 200°C (392°F) for 0.1 second
• Envelopes that use encapsulated types of adhesive that do not require
moistening but rely on pressure to seal them
Always test a sample of the envelopes you are thinking of buying. Confirm
that the envelope performs acceptably.