Author Archives: Jane

A4 Size Rigid Paper Box for Document

A well designed rigid paper box for the A4 size document papers can definitely make them more professional and high efficiency. Recently we made such a custom rigid paper box for a USA client. The box is usually referred to archive rigid paper box in general or archive paper box.

Works like a slipcase with the velcro closure

The cardboard archive box works like a slipcase. The office staff can easily slide the A4 papers inside and seal the box by the velcro closure  to keep the documents safe.

The velcro is 8mm in diameter, white color, which makes the box look very smart. The main advantage of the velcro closure is that it makes the box easy to open and close. Meantime, it keeps the documents safe inside without falling out.

customer rigid paper box for A4 papers document

Velcro closure for the rigid paper box, working like a slipcase for the office staff to slide into the A4 papers easily.

Glossy laminating

Unlike most other premium rigid boxes with the matte laminating or soft touch finish, the custom rigid box uses the ordinary glossy laminating outside, which conversely gives the folder a brilliant eye-appealing effect.

custom rigid paper box for A4 papers document

Glossy laminating outside for the custom rigid paper box

UV litho printing

Compared with the traditional litho printing, the UV printing makes the color more crisp on the paper box. The color printing on the cardboard paper box is quite simple, grey background color with the orange color ribbon in the middle.

Besides the orange version of the rigid paper box, we also make a red version, which is more beautiful.

Rigidity and Strength of the archive box

3mm chipboard is used to make the rigid archive paper box, which is quite strong for the rough handling.

rigid paper box for archive A4 papers

The other rigid archive paper box in red color

As a leading China paper box manufacturer and supplier, Shanghai DE Printed Box is a professional rigid paper box supplier and manufacturer, located in Shanghai of China. If you have a custom rigid paper box to make, please do not hesitate to contact us by sending an email.

Grammage and Price Calculation of the PET Sheets


PET sheets/films are widely used in the custom paper boxes to constitute the clear window, also referred to the clear window paper box. In this article, we will talk about how to calculate the grammage and price of the PET sheets.

The density of PET is constant,  1.38 g/cm3 (20 °C). For a piece of PET sheet measured 100cm length * 100cm width * 0.1mm thick,

PET密度:1.38 g/cm3 (20 °C)。

volume =100*100*0.1/10=100cm3 ;

10丝PET克重(0.1mm厚度): 100*1.38=138gsm;



Therefore, theoretically the 0.2mm thick PET sheet has the grammage 276gsm;

The cost of the PET is usually priced at RMB14,800/t.






In theory, the per square cost of 0.2mm thick PET sheet wold be 0.6USD.

But in practice, a lot of other fees would be involved to produce the PET sheet. In reality, the per square cost of 0.2mm PET sheet is around 1.2USD.

As a leading China paper box manufacturer and supplier, Shanghai DE Printed Box is a China medium-sized custom paper box manufacturer and packaging solution provider with facilities around 100,000 square meters in total. The company exclusively specializes in the supply and export of the custom paper boxes, including the paper printed boxcorrugated printed boxcosmetic paper boxrigid paper box, cardboard gift box and custom paper bag. If you have any questions about the custom paper box, or would like us to give you a price quote, please do not hesitate to contact us by giving us an email.

A Glossy Black Paper Bag Printed Inside and Out

Beside the common single sided printed paper bag, which is usually litho printed outside, Shanghai DE Printed Box also produces the custom paper bag and custom paper box printed inside and out. In this article, we will talk about a custom paper bag with the semi-gloss printing inside, which is made for the Malta Post in Malta.

custom paper bag china paper supplier

Glossy black printing outside the custom paper bag

The paper bag is a custom paper bag with the glossy black printing outside and semi-gloss red printing inside. It has the white cotton rope on the top for the easy carrying.

custom paper bag printing inside and out

Semi gloss red printing inside the custom paper bag

The paperboard used for the custom paper bag is 200gsm ivory paperboard. 250gsm, 157gsm are also very common for the printed paper bag. The printing solution is the litho offset printing and the finish is the glossy laminating outside and semi gloss vanishing inside.

Shanghai DE Printed Box is a leading China custom paper box and paper bag manufacturer, supplying various kinds of custom folding paper box, printed paper box, corrugated printed box and rigid paper box. If you have a printed paper box or bag to do, please do not hesitate to give us an email for a price quote.