1. Common sense of product size

1. Business diary series, determined by paper size:

B5 (positive degree 16K)

A5 (generous 32K)

B6 (positive degree 32K)

C7 (positive degree 48K)

A8 (generous 80K)

2. Universal manual series: determined by the size of the hole clip

8'' inches (large 32K)

7' inches (positive 48K)

5' inches (positive 80K)

2. Teach you how to identify product materials

1) The advantages of PVC material are: the material is relatively easy, waterproof and moisture-proof. Unlike the plastics we see every day, PVC also has the characteristics of flame retardant and heat insulation.

2) PU is a semi-crystalline material, PU material has lower thermal distortion temperature (100C, low transparency, low gloss, low rigidity, but has stronger impact strength. The strength of PU increases with the increase of ethylene content. Increase and increase. PU material has excellent anti-hygroscopic, anti-acid and alkali corrosion resistance, anti-dissolution.

3) Cow leather: The pores are small, round, evenly distributed and tight, the leather surface is bright and smooth, the texture is plump and delicate, the appearance is flat and soft, and the texture is firm and elastic when touched by hand. There are small folds on the surface. For leather products made of cowhide, if you don't look carefully, you can hardly see the bun.

4) Artificial leather is also called imitation leather. Since the imitation leather products currently made of polyurethane non-woven synthetic leather are similar in appearance to genuine leather products, they are imitation cowhide, and their appearance and feel are similar to those of cowhide and sheepskin. It feels like sheepskin, and the leather surface is shiny. However, if you look closely, there are no pores on the leather surface, and the bottom plate is not animal skin. If you squeeze it hard, the leather surface will not wrinkle.

the difference:

1) Hand feel: touch the leather surface by hand, if it feels smooth, soft, plump and elastic, it is genuine leather; while the general artificial synthetic leather surface is astringent, rigid, and has poor softness.

2) See: There are clearer pores and patterns on the real leather surface, yellow cowhide has relatively well-proportioned pores, HAO cowhide has thicker and sparser pores, goat skin has fish-scale pores, and pigskin has triangular thick pores. And artificial leather, although it is also imitated, has pores, but it is not clear.

3) Smell; all real leather has the smell of leather; and artificial leather has a pungent plastic smell,

4) Ignition: tear a little fiber from the back of real leather and artificial leather. After ignition, the artificial leather that emits a pungent smell and forms lumps; the leather that emits hair smells and does not form hard lumps.

Fan Da paper is a kind of special paper developed by Qiantong after more than one year's efforts. Features are as follows:

A. Paper surface, smooth surface, good smoothness, smooth writing. Does not smear.

B. The weight of 55g per square meter is adopted, which is very light, ultra-thin and easy to carry.

C. The paper has small flexibility and good toughness.

D. The paper has a tight texture and an even coating. Offset paper with opacity over 80g.

E. Ink absorption: The ink absorption is uniform, 80g offset paper in 5 seconds, van da paper in 8-10 seconds. Strong water resistance.