Notebook Printing

Introduction of paper in printing industry
1. Halftone Paper
Halftone paper is mainly used for letterpress printing of books and magazines. It can be classified into four grades in terms of materials composition.
Grade of paper implies its quality, the higher grade are lower in quality. The halftone paper is mainly used for letterpress. The paper is similar with newspaper in some way, without being exactly the same. Because the pulp composition and beating degree are better than that of the newspaper, the halftone paper has even fiber structure with the gaps filled with proper amount of fillings and sizing materials. Besides, the paper has undergone bleaching, thus, the paper suits well to letterpress printing.
Halftone paper features even texture, non-whiskering, slight flexibility, non-transparent, slight water-resistance and some mechanical strength.
Weight: 49～60±2g/m2
Specifications of flat paper: 787×l092mm，850×ll68mm，880xl230m and other special sizes
Specifications of paper reel: width: 787mm. 1092mm, 1575mm; length: about 60-80m
2. Newspaper:
Newspaper, also called newsprint paper, is mainly used for printing of newspaper, magazines and books.
Features:
1. The paper is soft with good flexibility;
2. The paper has good ink absorbency, therefore, the ink can quickly fix on the paper;
3. The two sides are smooth and won’t fuzz; therefore, printings at the two sides are clear and full;
4. The mechanical strength and non-transparency make the paper suit to high-speed rotary printing;
Weight: 49～52±2g/m2
Specifications of flat paper: 787×1092mm，850x 1168mm， 880x l230mm
Specifications of paper reel: width: 787mm, 1092mm, 1575mm; length: about 6000—8000m
Tools and materials:
 (1) a piece of square glass about 0.15g with side length of 20mm and thickness of 2mm;
 (2) a counterweight of 10g
 (3) cut the newspaper into the size of 15cm×11cm;
 (4) ink slab and ink doctor;
 (5) a clock for timing
3. Offset paper
Offset paper is mainly used for offset press or other presses for high quality color printing, such as posters, catalogues, brochures, color trademarks and some high quality books, covers, illustrations, etc. According to pulp composition, offset paper can be classified into 3 kinds: extra, No. 1, and No.2 with single-side and double-side. It also has two grades: super canlender and normal canlender. Offset paper features little flexibility, even ink absorbency, excellent smoothness, tight and non-clear texture, good whiteness and excellent water resistance. The best inks are film offset printing ink and letterpress ink of high quality. The ink shall not be too sticky and the backside shall avoid from sticky of dust.
Weight: 50，60，70，80，90，100， 120，150，180g／m2
Specifications of flat paper: 787 ×l092mm；850×1168mm
Specifications of paper reel: 787mm，1092mm and 850mm
4. Art paper
Art paper, also called coated printing paper, is made by calendering the raw paper coated with a layer of white stuff. The paper is smooth and white, with even distribution of fiber and weak retractility, good flexibility, strong resistance to water and tension. The paper performs well in absorbing and receiving ink.
Art paper is mainly used for printing of brochures, covers, post cards, product samples booklets and color trademarks. The pressure shall not be great when printing with art paper. It is better to choose resin ink or glassine ink for offset printing.
Weight: 70，80，100， 120， 150，180200，210．240，250g／m2。
Specifications of flat paper: 648×953mm，787×970mm，787×1092mm
Inspection Methods:
(1) Place a small amount of ink on the newspaper with a ink slab. Scrape the ink from top to bottom into a thin layer with width about 4—5cm and length about 12cm (no less than 10cm);
(2) Remember the duration of scraping the ink sample. After 15 minutes, place the newspaper with ink sample on a smooth glass plate, and cover the paper with another piece of blank newspaper. Press one end of the sample with square glass and counterweight.
(3) Quickly grasp the other end to move along the direction of sample to make the newspaper rub with the sample under the pressure of glass and counterweight.
 (4) Inspect if the newspaper is dyed, if so, repeat the above experiment at different places of the newspaper at regular intervals, till the paper can not be dyed, then, calculate the total duration.
5. Pictorial magazine paper
It is fine, white and smooth, used for pictorial magazine, catalogues and brochures, etc.
Weight: 65, 91 and 12g/m2
Specifications of flat paper: 787×l092mm