Figure 16 Insert movement polymer
Paper envelopes For paper envelopes, depending on the thickness of your Mailing Item, to prevent damage to your Mailing Item and other Mailing Items there are limitations on how much ‘empty’ envelope you are recommended to have i.e. the thicker the item, the less ‘empty’ envelope you are recommended to have (see figure 16). The following applies to the movement of the largest paper insert: • if your Mailing Item is ≤ 2mm thick there is no restriction on the lateral movement of the largest paper insert up to the maximum envelope size of 345mm ; and • for any Mailing Item which has a thickness of >2mm then the lateral movement of the largest insert within the Mailing Item is recommended to be ≤ 20mm or less.
13.5 Material – Construction 13.5.1 Paper Envelopes
Figure 15 Insert movement paper
It is recommended that: • the envelope paper weight is no less than 70gsm; • the paper weight for single piece (folded and sealed) Mailing Items is no less than 100gsm; • the paper weight for Large Letter sized postcards is no less than 200gsm; and • the Mailing Items do not have perforations. • polymer envelopes must be made of polymer film e.g. polyethylene; and • materials produced from polymer fibres that are randomly distributed and non-directional (laid as a web) and bonded together by heat and pressure are not acceptable e.g. Tyvek. 13.5.3 Material – general recommendations and requirements • Absorbency – (paper based envelopes) 15–35g of water in 1 minute (BS EN 20535 - Paper and board. Determination of water absorptiveness); • Glue – Any adhesives used in the production of envelopes are recommended not to leak onto the open surface of the envelope and produce protruding mounds and is recommended to be fully cured when the mail is presented to Royal Mail. It is a requirement that Mailing Items are not stuck together as we may not be able to read items that are and your Appe will appear incomplete. When polymer envelopes are used, the glue is recommended to be stronger than the polymer and is recommended not to produce protruding mounds on the mail item; • Opacity – ≥ 85 % (BS ISO 2471 – Paper and board. Determination of opacity (paper backing)); • Porosity – <700 ml/minute (BS 6538-2 – Air permeance of paper and board); 13.5.2 Polymer Envelopes and Polywrap
Polymer Envelopes For polymer envelopes or polywrapped Mailing Items, where the polymer is transparent only the largest insert must be visible to the front of the Large Letter and the lateral movement is recommended to be <20mm (see figure 17). There is no requirement for the content to be referenced to the bottom left corner, but you should ensure that there is no more than 20mm along the long edges and no more than 20mm along the short edges. Please note: For polymer envelopes or polywrapped Mailing Items you will need to allow for any lateral movement when defining the Delivery Address Block location. The assumption must be made that the poly may fold during processing and, should this happen we still need a defined clear area from the edge to ensure the Delivery Address Block can be read.
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