Labels When selecting labels, consider the quality of the following factors: Adhesives: The adhesive material should be stable at 200° C (392° F), the printer’s maximum temperature. Arrangement: Only use labels with no exposed backing between them. Labels can peel off sheets that have spaces between the labels, causing serious jams. Curl: Prior to printing, labels must lie flat with no more than 13 mm (0.5 in) of curl in any direction. Condition: Do not use labels with wrinkles, bubbles, or other indications of separation. Never use a sheet of labels that has already been run through the printer. Envelopes Envelope construction is critical.
Envelope fold lines can vary considerably, not only between manufacturers, but also within a box from the same manufacturer. Successful printing on envelopes depends on the quality of the envelopes. When selecting envelopes, consider the following factors: Weight: The weight of the envelope paper should not exceed 105 g/m 2 (28 lb), or jamming might result. Construction: Prior to printing, envelopes should lie flat with less than 6 mm (0.25 in) curl and should not contain air. Envelopes that trap air may cause problems. Condition: Make sure that the envelopes are not wrinkled, nicked, or otherwise damaged. Sizes: From 90 x 160 mm (3.5 x 6.3 in ) to 178 x 254 mm (7 x 10 in ).
Store envelopes flat. If air is trapped in an envelope, creating an air bubble, the envelope might wrinkle during printing. EN Guidelines for using media 47