4.6 Sealing Each item must be well sealed, taking care to avoid the use of too much gum or excess water which could result in envelopes sticking together.
4.10 Clear Zones You should leave the following areas clear of any markings.These areas are called ‘clear zones’ and are used by Whistl machines to print, read codes and locate the address on mail items.The address must not encroach into 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 Additionally, 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 it makes it difficult for our machines to read the address or codes. 4.12 Printing The address must be darker than the paper, e.g. 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 our machines cannot read against it.
• Metal clips or staples must not be used • The items must be sealed on all sides 4.7 Using window envelopes
Please follow these requirements if the address is to be read through a window: • The window position must be at least 15mm from the left hand edge of the envelope and at least 18mm from its bottom edge • 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.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 if possible e.g. don’t put commas or full stops at the end of lines The address block is defined as an imaginary box which surrounds the address (including the addressee’s name).There must be a 5mm clear zone around this block. See Appendix B for the optimum mail template. If you want to print a reference number or code near the address 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 4.9 Address block
or
2. Outside the 5mm clear zone
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