Ceramic tile core paper
What is corrugated board?
Corrugated board is a kind of multi-layer adhesive, which consists of at least one layer of corrugated medium paper interlayer (commonly known as "pit sheet" or "corrugated medium paper") and one layer of paperboard (commonly known as "kraft paper"). It has high mechanical strength and can withstand the collision and fall during handling. The actual performance of corrugated box depends on the characteristics of core paper and paperboard and the structure of the box itself.
Classification of corrugated board
According to different combinations, corrugated board can be divided into the following five types:
1. A cardboard composed of a layer of core paper and cowhide cards is called "exposed corrugated board". This kind of cardboard is generally only used for cushion, spacing and wrapping irregular objects.
2. The cardboard composed of one layer of core paper and two layers of cowhide cards is called "single pit cardboard".
3. Two layers of core paper are sandwiched between three layers of cowhide cards, which is called "double pit paperboard". Double-pit paperboard can be composed of pit paper with different pit widths and different papers, such as "B" pit paper with "C" pit paper.
4. Three-layer core paper is sandwiched between four layers of cowhide cards, which is called "three-pit cardboard".
5. Super duplex paperboard is developed from single pit paperboard, and the middle layer core paper is formed by overlapping and bonding two thick core papers. After decades of exploration and development, today's domestic manufacturers have been able to produce various combinations of corrugated boards. These boards have different characteristics and advantages, which meet the changing needs of the market.
Core paper material
The greater the pit diameter of corrugated board, the stronger its rigidity. The toughness of paperboard comes from the core paper layer, without thick and hard fillers. This can reduce the weight and cost of cardboard. Core paper can be made of semi-chemical pulp (which can provide the best paper strength) and recycled paper. The latter is favored by Hong Kong manufacturers because of its low cost. Although the paper strength is not as good as the former, it can be improved by adding starch to the paper mill.
Pockets occupy a certain space in corrugated paper and play a very important role. With them, they can withstand flat pressure, lateral pressure and other irregular pressures.
At present, the domestic manufacturers and sellers of corrugated base paper mainly include Anhui Huoshan Dongfeng Paper Co., Ltd., Fujian Longhai Beixitou Zheng Min Paper Factory, Guangzhou Shi Yang Corrugated Paper Factory, Foshan Shiwan Daxing Printing Materials Trade Center and Guangdong Dongguan Zhenxing Paper Co., Ltd.; The main producers and sellers of imported corrugated base paper are Norikan (Hong Kong) Co., Ltd. Shanghai Office, Shenzhen Chia Ling Trading Co., Ltd. and Hong Kong Xingang International Paper Co., Ltd. ..
The imported paper for corrugated box production supplied by foreign trade is mainly imported from the United States, Japan, Finland, Canada and other countries, with the quantitative of 360 g/m2 and 180 g/m2 corrugated base paper, and some of them are designated as 337 g/m2 corrugated base paper and 160 g/m2 corrugated base paper. In order to improve the paper for corrugated box production in China, some paper-making enterprises have also begun to trial-produce kraft liner paper (kraft liner paper) weighing 360 g/m2 and 420 g/m2. Subsequently, due to the construction and production of some paper-making enterprises and corrugated paper production enterprises, there are many kinds of paper products for carton production, and various levels and weights of carton board and corrugated paper base paper are continuously put on the market, which increases the choice of cardboard for carton production enterprises. The National Standard for Corrugated Board (GB-6544-86) requires that the paper materials used in the production of corrugated boxes must meet the requirements. The basis weights of box board paper are 250g/m2, 280g/m2, 300g/m2, 320g/m2 and 360g/m2 respectively, and corrugated base paper is 125g/m2 and 65433 respectively. In this way, the weight of single and double corrugated boards is about1000g/m2 ~100g/m2, which ensures the quality of cartons on the basis of quantitative guarantee.
Niupika
Cowhide cards constitute the inner and outer layers of corrugated board, and their functions can be structural or decorative. Each layer of kraft card provides various characteristics for paperboard, which can be extended by bonding, waxing and other processing procedures.
Light coated white cowhide card
Lightly coating white kraft paper: coating a thin layer on the basis of white kraft paper. Air knife coating can make the paper smooth. It not only has the printing advantages of coated paper, but also has the characteristics of easy printing of white kraft paper. Because the lightly coated coating is very thin, the thin coating will not crack easily and the coating can be kept very uniform. High-quality coatings based on porcelain clay can make ink and wash better adsorbed on paper. After printing, the ink on this paper can be dried quickly in a short time, which improves the printing production efficiency. It can even be printed directly by pressing lines and slotting, and can be folded or die-cut on some ink printers with drying devices.
At present, domestic enterprises producing and selling coated white cattle cards mainly include Dongguan Longteng Paper Company, Tangshan Xinyuan Paper Co., Ltd., Shandong Dezhou Shuangxing Industrial Co., Ltd. and Shaanxi Baxter Paper Co., Ltd.; The production and sales enterprises that import coated white cattle cards mainly include Qingdao Guanyu Paper Co., Ltd. and the Shanghai office of Conway Company of the United States.
Gravure preprinted materials must use coated white paper with good surface smoothness, strong printing adaptability and stable water content (6% ~ 7%). Imported coated cow card and domestic white board paper can meet the paper distribution requirements of high-grade color corrugated box paper. Finland's M-Real Forestry Company is famous for producing coated paper with high hygiene standards. 185g coated paper has been widely used in domestic prepress machines, and the paper basis weight ranges from150g/m2 to 350g/m2. Mead Paper has been coating kraft paper gravure cartons and canned beer portable cartons with 500g raw wood pulp, which is stronger than corrugated cartons.
At present, the domestic production and sales enterprises of all-wood pulp Niupai mainly include Fujian Qingshan Paper Co., Ltd., Heilongjiang Jiamusi Paper Group Co., Ltd., Guangxi Forestry Lipu Paper Co., Ltd., Dongguan nine dragons paper Co., Ltd. and Shanghai Dechanghang Paper Co., Ltd.; The manufacturers of imported all-wood pulp cattle cards mainly include Jifeng Paper Group (with offices in Beijing, Guangzhou and Shanghai), Beijing Office of American CNG Paper Company, Harbin Tianyu Paper Co., Ltd., Shandong Qingdao New Sincerity Trading Co., Ltd., Shanghai North Asia Ruisong Trade Development Co., Ltd. and Zhejiang Hengtong Paper (Jiashan) Co., Ltd. ..
Foreign kraft liner boards generally use 100% natural wood pulp, some use natural wood pulp to dry noodles, and waste paper pulp as base pulp. Due to the high content of long fiber, the physical strength of paperboard is relatively improved, and the moisture-proof performance is good, which is suitable for mass production. However, there is a shortage of wood resources in China, so vermicelli generally uses 40% ~ 50% wood-colored wood pulp and wheat straw or waste paper pulp as the base pulp. The physical strength of paperboard depends on the different proportions of pulp and straw pulp, but generally about 20% of natural wood pulp is used for vermicelli, and about 80% of wheat straw, straw and waste paper pulp are mixed with the original pulp to form low-grade kraft liner board. This kind of paperboard has a moderate price and has become a kind of paper used more in the production of corrugated boxes in the domestic market.
White cow card: It can be divided into coated white cow card and white dried cow card (cow card with bleached wood pulp on the surface).
Domestic beef vermicelli (kraft liner board) production and sales enterprises mainly include Anhui shanying paper Co., Ltd., Beijing No.7 Paper Factory, Fujian Quanzhou Board Factory, Dongguan Liwen Paper Factory Co., Ltd., Hebei Luquan Shunfa Industrial Company, Henan xinmi city Xinghua Board Factory and Inner Mongolia Beichen Board Industry Co., Ltd.; Imported beef noodles (lined with kraft paper) are mainly produced and sold by Austrian Han Wei Co., Ltd. Beijing Representative Office, Bao Zhong International Trade Co., Ltd., Jining Oriental Packaging Co., Ltd., Shanghai Jingsheng Packaging Material Co., Ltd. and Tianjin Xingshan International Trade Co., Ltd.
Domestic white-flour cattle brand production and sales enterprises mainly include Fujian Minqing Paper Company, Nantong Bao Zhong Pulp and Paper Co., Ltd. and Zhejiang Dongxing Paper Co., Ltd.; The production and sales enterprises that import white-flour cattle cards mainly include Finland Forestry Co., Ltd. Beijing Office, Jiangsu Hongyu Economic and Trade Co., Ltd. and Qingdao Maoyuan Economic and Trade Co., Ltd.