Then it is not necessary to remove a section of the contents with a removal bar, and a slower-action mechanism not requiring a special design for quick center insertions may be used. It is only ring and prong type binders that permit the sheets to lie perfectly flat with the total binding edge horizontal and in view. Expanding, telescopic type post binders approach this exposure when not filled to capacity. Post binders, spring and clip binders, strap and lace binders draw together and conceal the binding edge. Sheets must fold over from a vertical position to lie flat.
Lightweight sheets fold over with a small radius.
Heavy-weight sheets tend to form a larger radius, therefore a larger binding margin should be allowed to avoid hiding part of the type page. Indexes or sectional dividers should be scored so as not to further incline the sheets. If other binders in use contain data that may later constitute a worthwhile additions to your binder, try to standardize the hole punching and sheet size. Standard three-hole punching is most popular because it allows the user to punch inserts without the need for uncommon special equipment. However, using standard punching often invites extraneous materials into your binder, especially by independent salesmen or dealers.