What are the windows in envelopes made of?

Envelopes with transparent window

Gummed envelopes. The flap must be moistened for gluing, which is done either with the tongue or with a moistened pad. The flap is triangular in shape and this is the classic closing system.

Padded bags (white or unbleached): These are paper envelopes with bubble wrap inside. They are used to send delicate items such as video tapes, CDs, floppy disks, etc.

Colors: USSR prefranked envelope of 4 kopeks preprinted, decorated and printed with the image of Otto von KotzebueThe traditional colors for envelopes and that allow a correct legibility are white and sepia. However, they can adopt different colors, which is common in advertising mailings. They can also be printed with different promotional messages as long as the address and name of the addressee are clearly visible.

Mail Art Envelopes: Envelopes artistically manipulated by the creators who work in Mail Art, and that circulate through the countries containing the works object of the exchange of the postal artists, or being the same envelope of that artistic product.

Examples of envelopes

The success of a shipment depends on many different factors, but everyone who sends a package, a letter, a postcard, business cards, a gift or a dedication, has as a first objective that the recipient opens it and pays attention to it.

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In the same way that we care about the packaging of the smallest detail or gift to make it attractive, a white envelope can convey formality and elegance. Getting it right is sometimes much more difficult than sending postcards in the typical kraft envelope, and the envelope has to make the contents attractive, even when sending invoices for products or services rendered in a white envelope.

Take note of the indications below and make use of the tools we provide you with, only then you will discover the best option for your mailing! If you have any doubts, remember that our customer service team is at your disposal to advise you and recommend the products that best suit your needs, whether for the home or for the office.

What are the parts of an envelope

But what exactly are these bags made of? For the most part, bread bags are made from kraft paper. A packaging solution made from wood pulp, which gives it that characteristic brown color.

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So what do we do with these bags when we finish our bread? As they can be made from two different materials at the same time, plastic and paper, which container should we throw them in? We tell you.

Of course! One of the advantages of kraft paper is that it is 100% recyclable, making it an environmentally friendly packaging option and perfect for transporting your loaves of bread or other food!

If it is not possible to separate the two materials, you will have to assess how much paper and plastic is in the packaging, i.e., which material is in greater quantity. If it is a bag that only shows part of the product, you should throw it in the blue container, but if most of the product is visible and it has more plastic than paper, you should throw it in the yellow one.

Window envelopes

A bioriented polypropylene film for window envelopes comprising two or more layers, the central layer, or body of the film, being mostly composed of polypropylene, and at least one of the outer layers being compatible with adhesives. The main advantage of the present invention is that it is fully compatible with the machinery or processes currently used for the manufacture of envelope windows with other films, favoring the use of polypropylene, with a reduction in consumption of between 15% and 35%, depending on the type of film to be replaced.

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The present descriptive memory refers, as its title indicates, to a bioriented polypropylene film for envelope windows, characterized in that it comprises two or more layers, being the central layer, or body of the film, composed mainly of polypropylene, and at least one of the outer layers being compatible with adhesives, presenting several competitive advantages with respect to the plastic films currently used in this sector.