Classification and specifications of industrial paperboard
Types of paper and paperboardA quantity of less than 225g / m2 is considered paper, and a quantity of 225g / m2 or more is considered to be cardboard. This shows that cardboard is a generic term for some paper with higher stiffness. There are many ways to classify paper and cardboard.According to the choice of raw materials to be divided into: plant fiber, mineral fiber, animal fiber, chemical fiber or other fibers produced paper or paperboard. Among them, plant fiber, paper and cardboard based.According to mode of production can be divided into: handmade paper and paper. This book deals only with the latter.According to the use of divided into: cultural paper, industrial and agricultural technology, paper, packaging paper and living paper four major categories. Paperboard can be broadly divided into four categories: paperboard for packaging, industrial technology for paperboard, building board for printing and decorative paperboard for use.
Standard Specification for paper and paperboardPaper and paperboard are divided into two categories: flat paper and web paper. Their specifications and sizes have certain requirements.The size of ordinary flat paper is: 787 * 1092mm, 880 * 1092mm, 880 * 1230mm, 850 * 1168mm. Standard dimensions for several flat sheets of paper and paperboard. Various special sizes of paper and paperboard can be produced according to user's needs. The width of web paper is regulated by national standard. Standard for width of a number of web and web board. The national standard has no uniform regulation on the length of web paper, but the reel diameter has a certain range, about (750~850) mm, and the core diameter of the paper is about (75~85) mm. There are customary practices for length requirements, such as the length of reel newsprint and printed paper, 6000m, and the length of roll paper bags to 4000m. The width error of web is no more than + 3mm. According to user needs, according to the contract production of non-standard width.The market supply of domestic flat paper size is most commonly known as a standard 787 * 1092mm. The international standard size is 880 * 1230mm. There are also some different sizes of paper and cardboard. For example, 584 mg * 1090mm, 635 * 1118mm, 686 * 864mm; typing paper, paper covers 559 x 864mm; 635 * 1118mm 584 * 762mm; drawing paper; tracing paper 864 * 1219mm, 610 * 864mm 572 * 724mm; white cardboard; wrapping paper of 889 * 1194mm 508 * 762mm; glazed paper; Tea Board 724 * 864mm, 864 * 1092mm; corrugated paper 1100 * 1590mm and 889 * 1194mm; carton 880 * 960mm and 880 * ll00mm; grass paperboard 787 * 546mm, 787 * 660mm.
Conversion of paper weight and areaThe basic unit of measurement of paper, handmade paper for knife and bear; to make, and tons of paper. All sizes of handmade paper, 1 knives for l00 sheets; 1 pieces of paper for 50kg. The paper is English Ream transliteration, 1 reams of paper cut paper plate 500 is equal to the whole. In some countries, l has 480 sheets of paper and 500 pieces of paper, and the L regulations in the UK require 1000 sheets of printed paper and two writing paper. Therefore, it is necessary to pay attention to the use of imported paper.Paper is sold in units of weight, but in use it is calculated in terms of area. Therefore, they have to be converted.
