Many factors play a role in choosing the ideal envelope: color, format, and material are usually the first criteria for decision-making. But only the right type of closure ensures that your shipment meets your specific needs as a consumer. Whether you want to seal your mail by hand or process it by machine, the right adhesive method saves time and ensures maximum security. We offer a wide range of models and guarantee fast shipping, no later than one business day after receipt of your order.
Envelopes with a wet adhesive closure are the most widely used type. As this closure has been the standard for decades, you will find a particularly large selection of different designs here. These envelopes have a gummed closure that is activated by moistening with a sponge or a letter moistener. A major advantage: wet adhesive envelopes remain sealed for up to 5 years and are usually the only choice for machine enveloping in professional mailrooms.
If you want to avoid moistening the gummed flap, you can use self-adhesive envelopes. These have a two-component adhesive on the flap and the counterpart. As soon as both surfaces are pressed together, they bond immediately. This method saves a lot of time and is very convenient in everyday office life. A minor disadvantage is the limited shelf life, as the adhesive can lose its adhesive strength after about a year. On the other hand, these envelopes are often easier to reuse than other types of closures.
The self-adhesive closure type, often referred to as Haftfix, is the modern answer to high efficiency and durability. These Haftfix envelopes have an adhesive strip covered by a protective paper. The cold glue or "hot melt" adhesive used is characterized by extremely high initial adhesive strength. Handling is very simple: remove the protective strip, press down the flap, and you're done. Since the adhesive is protected under the strip until use, these self-adhesive envelopes remain usable for up to 5 years.
A special feature on the market is the combination of self-adhesive and pressure-sensitive properties, known as Revelope. Here, the adhesive strip is concealed behind an additional flap directly under the letter opening. To seal the envelope, this flap is simply folded down. The big advantage: there is no waste in the form of a protective strip, while at the same time you benefit from the long-lasting adhesive strength that is otherwise only found in gummed or pressure-sensitive products.
Regardless of which type of closure you prefer, proper storage is crucial for the quality of the adhesive. To prevent the adhesive from drying out, you should store your envelopes in a dry, cool, and dark place. The adhesive properties are optimally preserved at a humidity of between 40% and 70% and a temperature of approx. 20°C.
At Kuvertwelt.de, you can order all products by the piece —we deliver from as little as one item. Take advantage of our attractive bulk pricing to benefit from lower prices on larger quantities. Our customer service team will be happy to advise you on choosing the right adhesive technology for your next project.