Basic knowledge of raw paper: door width, classification, use, et
1. Door width of original paper (also called paper length in guangdong)
Generally, the smallest size of the original paper is 800mm. Of course, the paper mill can be divided according to different door width, and the largest size is 2800, because the largest domestic production line is 2800.
In the pearl river delta region, due to Hong Kong's custom, according to the inch measurement, the minimum is 29 ", the maximum is 55 ", a total of 14 odd width, the original paper produced into cardboard has 14 paperboard (along the hole direction of the board width), namely 29 ", 31 ", 35 ", 37 ", 39 "......55 ".
2. Identification of original paper
Classification of raw paper (gram weight and code name) : paper can be classified according to national standards. There are also common terms in the pearl river delta region.
(1) damage resistance index is the measurement standard. Generally speaking, the higher the damage resistance index is, the higher the grade is. According to the damage resistance index, it can be divided into the following categories:
K paper: rupture resistance index: above 3.2 g weight range of 130-280 g/m2
A paper: rupture resistance index: 2.7-3.2 g weight range: 130-230 g/m2
B paper: rupture resistance index: 2.3-2.7 g weight range 130-200 g/m2
C paper: break resistance index: 2.2 below 110-200 g/m2
American card: the United States imported cattle card, the rupture index is generally above 4.3
Australia card: Australia imported cattle card, the rupture index is generally above 4.3
Russian card: Russia imported cattle card, the rupture index is generally above 4.7
White card: the ox card with white surface, the resistance index is generally above 2.3
Coated whiteboard: white card coated on the surface, with a tear resistance index of around 1.8
(2) common terms in the pearl river delta:
K paper: 250g/m2 T paper (white) : 200g/m2
A paper: 175g/m2 2 paper: 125g/m2
B paper: 125g/m2 3 paper: 105-115g/m2
C paper: 127g/m2 6 paper: 200g/m2
G paper: 300g/m2 7 paper: 260g/m2
F paper: 112g/m2 8 paper: 310g/m2
W paper: 180g/m2 9 paper (white) : 125g/m2
KW (140g/m2) is also called white 1 paper: 112g/m2
M paper: 160g/m2 5 paper: 150g/m2
Classification according to purpose: tissue and lining
Surface paper: a layer of kraft paper on corrugated board, also known as cardboard.
A. Tissue paper (box board paper) is generally unbleached kraft paper. Kraft paper is a fiber mainly composed of cork sulfate pulp, which is manufactured on the long-mesh paper machine.
B. Add a layer of bleaching pulp to the top of the unbleached carton paper to make the carton paper white on one side and primary color on the other, which is called white carton paper and suitable for printing.
C. The physical indexes of carton board include rupture resistance strength and ring compression strength
D. The quantity of carton board is generally (115-280g/m2).
Corrugated core paper: corrugated base paper includes corrugated core paper (medium paper) and corrugated paper.
A. It is mainly made of semi-chemical pulp (i.e. raw pulp soaked with sulfite and soda ash, and then mechanically ground into pulp) on the long-mesh paper machine. At present, domestic paper production is mainly based on waste paper.
B. The main physical indicators are ring compression strength and fracture length.
C. Corrugated paper ration is generally 60-170 g/m2.
Inside paper: namely corrugated board most inside a layer, commonly used paper with the same surface paper also known as cardboard.
But the inside paper is generally used than the surface of the poor grade of cardboard.