Black cardboard is a kind of thick paper with a large weight. The reason why it is called black cardboard is because dye is added to the original pulp paper during beating, so that the entire paper becomes completely black, hence the name. Corresponding to it is white cardboard, one white and one black, it can be said that the world is bright and has its own destiny.
In the past, some people planned to divide paper, cardboard and cardboard based on quantitative basis. In the early years, white thick paper with a ration of about 200g/square meter (smooth surface, calendered, high stiffness, also called thin cardboard) was called heavy paper in the Shanghai market. In fact, it is also a kind of jam. The most common cardboard is not colored and is commonly called white cardboard. If it is colored, it is called color cardboard according to the color. The surname of white cardboard is "white", so the whiteness requirements are very high. The whiteness of grade A is not less than 92%, grade B is not less than 87%, and grade C is not less than 82%. If the whiteness exceeds 90%, it will be a bit "bright and dazzling". Colored cardboard has different colors on it. Red is called red card, green is called green card, and black is called black cardboard.
There are three main categories of black cardboard:
1. All-wood pulp neutral and environmentally friendly, referred to as all-wood pulp black cardboard, pure wood pulp black cardboard, environmentally friendly black cardboard, neutral black cardboard;
Features: PH is neutral, environmentally friendly dye, 100% recyclable, no pollution, no color difference on both sides, the color of the sandwich part is also black, made from commercial raw wood pulp, ultra-high stiffness, perfect smoothness and flatness , strong pulling force, weights ranging from 80g to 450g are available in stock, and those exceeding 450g can be framed.
2. Double-sided see-through black cardboard. Referred to as double transparent black cardboard, transparent black cardboard.
Features are: environmentally friendly dyes, recyclable, no pollution, no color difference on both sides, the color of the sandwich part is also black, made from American waste into wood pulp, high stiffness, strong tensile strength, weight from 180-450g are available in stock , those exceeding 450g can be framed.
3． Single sided black cardboard. Abbreviation: single transparent black cardboard, black background black cardboard.
Features: environmentally friendly dyes, recyclable, no pollution, color difference on both sides, made from American waste into wood pulp, high stiffness, strong tensile strength, weights ranging from 180-600g are in stock, and those over 600g can be mounted combine. This black cardboard has the characteristics of no white spots on the surface, fine paper, and good stiffness. It is suitable for photo albums, photo frames, gift boxes, jewelry boxes, stationery, leather products, speaker electronic gaskets, and various handicraft packaging. It is suitable for high-frequency files. Folders, quick folders, shoe boxes, cosmetic boxes, boutique boxes, watch boxes, mobile phone boxes, MP3 boxes, tea boxes, handbags, clothing, hardware packaging, clothing tags, wall calendars, calendars, desk calendars, photo albums, etc.
The above is the relevant introduction to black cardboard. Black cardboard is also one of the common types of paper in our lives and plays an indispensable role in our lives. Black cardboard is mainly used for photo albums, photo frames, back boards, gift boxes, jewelry boxes, mobile phone boxes, shoe boxes, stationery, clothing tags, notebooks, desk calendars, handbags, speaker speaker electronic gaskets, and various handicraft packaging. You may never notice it, but it is always there, neither sad nor happy.