Communication is an important means of social interaction, and its history is long, so it has produced many anecdotes related to it in both ancient and modern times.

Letters of course cannot be separated from the envelope.

As a necessity of communication, the envelope is not as popular as stamps, but its appearance is thousands of years earlier than stamps. In 3000 B.C.

The Assyrians and Egyptians engraved the contents of letters on clay tablets.

Then sealed in pottery billets and fired into pottery, which was the earliest form of envelopes to appear in the world.

After thousands of years of development, the envelope, today, is no longer just a simple communication tool used to keep secrets but has become a multi-functional carrier, including mainly cultural and commercial functions.

The emergence of the envelope certainly makes people's communication confidential, but with the development of society, a new thing has been born in the history of human communication---postcards.

A postcard is a hard card for writing simple content and does not have to be mailed in a jacket.

The first person in the world to adopt the postcard method of sending letters was a German painter.

The first person to suggest the postal service print postcards was German postal counselor Heinrich von Stephan, and the first country to officially issue postcards was Austria.

Envelopes were generally offset paper.

Offset paper has low stretch and uniform absorption of ink.

Good smoothness, tight opaque texture, good whiteness, and strong water resistance, should be selected for junction film type offset ink and good quality lead printing ink.

The viscosity of the ink should not be too high, otherwise, it will appear off the powder.

Hair-pulling phenomenon. Also, prevent the back from sticking dirty, generally using an anti-dirty agent.

Spray powder or lining paper.

The use of envelope printing

1 . For the delivery of letters

The product use of envelopes is well known, its mailing function is its original, but also the basic function.

It is a traditional mailing method, still respected by some people, especially some older friends, who tend to be more adapted to the mail.

2 . For storing related bills and simple information

Envelope products are very convenient to use for printing products.

There are many friends who are still very willing to use envelope products to put some relatively simple information, and some bills, used to place these things can avoid loss and damage.

In today's world, due to the rapid development of modern communication technology and network technology, traditional communication is gradually forgotten by people, only to be seen as nostalgic or even backward.

However, traditional correspondence, which has developed along with human civilization for thousands of years, will definitely not disappear completely in a short period of time.

Because from its body, we can learn too many cultural and historical connotations, and these, are precisely the modern technology can not bring us.