Envelopes, generally refer to the paper bag like thing for transporting information, and keeping the infro safe. they usually tend to be rectangle.
1, size of envelopes: there are 5 chinese standard evelopes
, No.2(size B6) 176*125mm /No.5(DL) 220*110mm/No.6(ZL) 230*120mm/No.7(C5) 229*162mm/No.9(C4) 324*229mm. Envelpes can be used widely in industry and life, not just for letter containing, packaging for CD, button or glasses. most of the evelopes exported abroad are not standard ones.
2, types of evelopes: chinese envelopes are with the openning on the long side, the west countries´ on the short side contrastly. Kinds of diamond envelopes are mainly used for greeting cards. there are also some envelopes with window like bank statement envelopes
, CD packaging bags and so on. envelopes specially for computer: the round holes are made on the paper envelopes to be identificated. 3, sealing of the envelopes: no glue envelope
is the common type in domestic and sealing with adhesive ones populared abroad.
The paper material usually be 80g-150g kraft paper, sometime art paper and copper paper can be adopted for special use. The envelope make require that the paper must be tensile and tearable.
The use and standard size of envelpe
Envelopes can used for normal mailing, air mailing, large-scale and international matters with 10 different sizes. the detailed request of envelopes paper is at least 80g B grade offset paper or B grade kraft paper.
common envelope: for letter mailing by water and by land.
aviation envelope: special ones mailed by air
international envelope: for mailing to other countries or areas.
special envelope: for express mail, etiquette, insured letters.