4.10 Clear zones
• The maximum gloss value of the window material should be 150 when measured at 60° in accordance with ASTM 2457 standard test method for specular gloss of plastic films. • The window haze should not exceed 75% in accordance with ASTM D1003 standard test method for haze of plastic films. • The item inside the envelope must fit securely and not move around and the address must always be fully visible. • The window should not infringe any of the clear zones on the mail piece. See Appendix B for the optimum mail template. 4.8 Address • All lines of the address must be justified left. • The extremities of the address block must be at least 5mm away from the edge of the label or window. • Excessively skewed addresses cannot be read. The Whistl sortation machine can only tolerate a maximum skew of plus or minus five degrees from the horizontal. • Punctuation should be avoided e.g. don’t put commas or full stops at the end of lines. 4.9 Address block The address block is defined as an imaginary box that surrounds the address including the addressee’s name. There must be a 5mm clear zone around this block. See Appendix B for details. If you want to print a reference number or code near the address, then this must be printed either 1. Within the address block as the top line of the address and left justified to form part of the address or 2. Outside the 5mm clear zone
The following areas should be left clear of any markings. These areas are called ‘clear zones’ and are used to print and read codes and locate the address. The address must not encroach any of these clear zones: • 5mm around the address. • 18mm from the bottom edge and 115mm from the right edge. • A zone 15mm from the right hand edge and 70mm from the bottom edge. • A zone 115mm from the right hand edge and 10mm high; with the zone’s top edge starting 70mm from the bottom edge of the item. • No part of the address should fall within 40mm of the top of the mail piece. 4.11 Paper colour The most suitable colours for envelopes are white, cream or buff. Other colours may be used, so long as they are light or pastel shades which contrast by at least 50% in tone with the address. Please do not use red or dark coloured envelopes as address and codes will be difficult to machine-read. 4.12 Printing The address must be darker than the paper. For example don’t print the address in white ink on dark paper. Please do not use red or dark colour ink for printing logos, designs or text behind the address as they cannot be machine-read. Whistl will supply the relevant equipment for the final transportation of mail to Whistl centres. Whistl will base the initial tray and container allocation on the forecast figures provided. Whistl Client Services will determine a replenishment of Whistl trays and magnums based on the weekly forecast provided.
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