Secure on-pack promotional coupons

A secure, on-pack, promotional label assembly comprising:

• a backing strip;
• a coating of release material on said backing strip;
• at least one label bearing advertising printed material on the front thereof, mounted on said backing strip;
• a coating of adhesive mateiral on said label and facing said backing strip;
• said label assembly including promotional printing material supported on said label assembly, and said label assembly including means for concealing said promotional material when viewed from the side of said label bearing advertising printed material;
• said promotional material and the support therefor being waterpoof;
• and
• said assembly having means including water-soluble adhesive material for initially securing said label assembly when it is mounted on a product so that said promotional material is not exposed;
• whereby said promotional material may only be exposed by the application of water to said water soluble adhesive.

A method comprising the steps of:

• printing promotional material on substantially waterproof label sheet stock;
• applying a hot melt, water-soluble permanent, pressure-sensitive adhesive to said label sheet stock with the label sheet stock moving in a predetermined direction, said adhesive being applied in a pattern to each label area with the pattern being interrupted both in said predetermined direction, and transverse thereto;
• securing said label stock to a release coated backing web;
• forming individual label assemblies from said label stock;
• applying said label assemblies to product containers with the promotional material being concealed by at least one layer of said label stock;
• and
• subsequently exposing said promotional material by the application of water to said labels.

A method involving the use of promotional material concealed in label assemblies comprising the steps of:

• printing promotional material on label sheet stock forming at least part of label assemblies;
• applying a water-soluble, permanent adhesive to label sheet stock forming at least part of said label assemblies;
• securing said label stock to a release coated backing web;
• forming individual label assemblies from the label stock;
• applying said label assemblies to product containers with the promotional material being concealed by at least one layer of said label stock;
• and
• subsequently exposing said promotional material by the application of water to said assemblies.