As an important member of packaging products, corrugated boxes occupy a large share in the market. The main materials for making cartons are: all wood pulp cattle cards, noodle cattle cards (kraft box paper), white flour cattle cards, coated white flour cattle cards, corrugated core paper, specialty paper, tea board paper and coated whiteboard paper. This edition will give you a brief introduction:
What is corrugated cardboard?
Corrugated cardboard is a multi-layer adhesive body, which is composed of at least one layer of corrugated core paper interlayer (commonly known as "pit sheet" or "corrugated core paper") and one layer of cardboard (commonly known as "kraft card"). It has high mechanical strength and can withstand collisions and falls during handling. The actual performance of corrugated boxes depends on the three factors of the characteristics of core paper and cardboard and the structure of the carton itself.
Classification of corrugated cardboard
According to different combinations, corrugated cardboard can be divided into the following five types:
1. The paperboard composed of a layer of core paper and kraft paper is called "corrugated paperboard". This kind of cardboard is generally only used for cushioning, spacing and wrapping irregularly shaped objects.
2. The cardboard composed of one layer of core paper and two layers of kraft cards is called "single pit cardboard".
3. The two-layer core paper is sandwiched in three-layer kraft cards called "double-pit cardboard". Double-pit paperboard can be composed of pit paper with different pit widths and different paper quality, such as "B" pit paper and "C" pit paper.
4. The three-layer core paper is sandwiched between four-layer kraft cards and is called "three pit cardboard".
5. The super strong double body paperboard is developed from the single pit paperboard, and the middle layer of core paper is formed by two thick core papers stacked and bonded together. After decades of exploration and development, today's domestic manufacturers can already produce a variety of different combinations of Corrugated Board. These paperboards have different characteristics and strengths to meet the changing needs of the market.
Core paper materials
The larger the pit diameter of corrugated cardboard, the stronger its rigidity. The toughness of the paperboard is derived from the core paper layer without the need for thick and hard fillers. This can reduce the weight of the cardboard and its cost. Core paper can be made of semi-chemical pulp (this pulp can provide the best paper strength) and recycled paper stock. Because the latter is low in cost, Hong Kong manufacturers are willing to adopt it. Although the paper strength is not as good as the former, it can be improved by adding starch to the paper mill.
The pit pattern occupies a certain space in the corrugated paper, and its role is also very important, through which it can withstand flat pressure, side pressure and other various irregular pressures.
At present, domestic corrugated core paper production and sales enterprises mainly include Anhui Huoshan Dongfeng Paper Co., Ltd., Fujian Longhai Beixitou Civil Affairs Paper Mill, Guangzhou Yangshi Corrugated Paper Mill, Foshan Shiwan District Xingda Printing Material Trade Center and Guangdong Dongguan Zhenxing Paper Manufacturing Co., Ltd., etc .; the production and sales of imported corrugated core paper mainly include Norican (Hong Kong) Co., Ltd. Shanghai Office, Shenzhen Jialing Trading Co., Ltd. and Hong Kong Xingang International Paper Co., Ltd. etc.
Imported corrugated box production paper supplied by foreign trade mainly imports from the United States, Japan, Finland, Canada and other countries with a basis weight of 360g / m2 cattle card and 180g / m2 corrugated base paper, and some of them are set to 337g / m2 cattle card and 160g / m2 corrugated base paper. . In order to improve the domestically produced corrugated box production paper, some paper-making enterprises have also begun to test the amount of 360g / m2 and 420g / m2 kraft box paper (kraft cardboard). Subsequently, due to the construction and production of some paper-making enterprises' products and corrugated box production paper production enterprises, there are many items for carton production paper, and various grades and weights of cardboard paper and corrugated base paper are continuously put on the market. Carton production enterprises have choices for cardboard increase. Corrugated cardboard national standard (GBï¼6544-86) requires that the paper materials used for corrugated cardboard production must meet the requirements. The basis weight of the cardboard is 250g / m2, 280g / m2, 300g / m2, 320g / m2, 360g / m2, Corrugated base paper is 125g / m2, 150g / m2, 180g / m2, so that the single and double corrugated board weight is about 1000g / m2 ~ 1100g / m2, on the basis of ensuring a certain amount, to ensure the quality of the carton.
Leather card
Kraft cards form the inner and outer layers of corrugated cardboard, and their functions can be structural or decorative. Each layer of kraft card provides various characteristics for the cardboard, and these characteristics can be expanded through processing processes such as bonding and waxing.
Lightly coated white cow card
Light coating of white cattle cardboard: a thin coating layer is coated on the basis of white cattle cardboard. The coating uses an air knife coating method that can smooth the surface of the paper. It not only has the printing advantages of coated paper, but also has the characteristics of easy printing of white cattle cardboard. Since the lightly applied coating is very thin, the thin coating will not easily break and powder, and the coating can be kept very uniform. The high-quality paint mainly made of porcelain can make the ink better adsorb on the paper. After printing on such paper, the ink can be quickly dried in a short time, and the ink can be dried quickly to improve the printing production efficiency. It can even directly print the pressure line and groove, and can be folded or die cut on some ink printing machines with drying devices produce.
At present, the production and sales enterprises of domestic coated white-faced cattle cards mainly include Dongguan Longteng Paper Company, Tangshan Xinyuan Paper Co., Ltd., Shandong Dezhou Shuangxing Industrial Co., Ltd. and Shaanxi Baite Paper Co., Ltd .; The production and sales enterprises of cloth white-faced cow cards mainly include Qingdao Guanyu Paper Co., Ltd. and the Shanghai office of Kangweima Company.
The gravure preprinted printing material must use coated white paper with good surface smoothness, strong printing adaptability, and stable moisture content (6% to 7%). Imported coated cow cards and domestic gray bottom whiteboard can meet the paper matching requirements of high-grade color corrugated box facial paper. The Finnish M-REAL forestry company is well-known in the world for producing coated paper with high hygiene standards. 185g of coated paper has been widely used in domestic pre-printing machines. The quantitative range of paper is 150g / m2 ～ 350g / m2. Mead Paper of the United States has been using 500g of raw wood pulp to coat cattle cardboard gravure printing cartons and canned beer carrying cartons, which are stronger than corrugated cartons.
At present, the production and sales of domestic whole wood pulp cattle cards mainly include Fujian Qingshan Paper Co., Ltd., Heilongjiang Jiamusi Paper Group Co., Ltd., Guangxi Forestry Lipu Paper Co., Ltd., Dongguan Jiulong Paper Co., Ltd. and Shanghai Dechanghang Paper Co., Ltd., etc .; the production and sale of imported wood pulp cattle cards mainly include the international Jifeng Paper Group (with offices in Beijing, Guangzhou, Shanghai and other places), and the Beijing office of US CNG Paper Company , Harbin Tianyu Paper Co., Ltd., Shandong Qingdao Xinzhencheng Trade Co., Ltd., Shanghai North Asia Ruisong Trade Development Co., Ltd. and Zhejiang Hengtong Paper (Jiashan) Co., Ltd. etc.
Foreign kraft boxboard paper generally uses 100% natural wood pulp, but also uses natural wood pulp noodles, with waste paper pulp as the bottom pulp. Due to the high content of long fibers, the physical strength of the paperboard is relatively improved, and it has good moisture resistance and is suitable for large-scale production. However, China's wood resources are in short supply, generally 40% to 50% wood colored wood pulp noodles are used, and wheat straw, straw or waste paper pulp is used as the bottom slurry. The physical strength of the cardboard depends on the different ratios of pulp and straw pulp, but generally uses about 20% of the natural wood pulp noodles, and about 80% of wheat straw, straw, and waste paper pulp are mixed to make low-grade kraft board paper. This kind of boxboard paper is moderate in price, and has become a kind of paper used in domestic corrugated box production.
White-faced cow card: divided into white-faced cow card and white-noodle cow card (the top layer is bleached wood pulp cow card).
The production and sales enterprises of domestic noodle cattle cards (kraft box paper) mainly include Anhui Shanying Paper Co., Ltd., Beijing No. 7 Papermaking Factory, Fujian Quanzhou Cardboard Factory, Dongguan Liwen Paper Factory Co., Ltd., and Luquan City, Hebei Province. Industrial Co., Ltd., Xinmi City, Henan Province, Xinghua Paperboard Factory and Inner Mongolia Beichen Paperboard Co., Ltd .; the production and sales of imported noodle cattle cards (kraft boxboard paper) mainly include Austrian Weihan Joint Stock Company Beijing Representative Office, Zhongbao International Trade Co., Ltd., Jining Oriental Packaging Co., Ltd., Shanghai Jingsheng Packaging Materials Co., Ltd. and Tianjin Xingshan International Trade Co., Ltd. etc.
The production and sales enterprises of domestic white-faced cattle cards mainly include Fujian Minqing Paper Co., Ltd., Nantong Zhongpu Pulp Paper Co., Ltd. and Zhejiang Dongxing Paper Co., Ltd .; the production and sales enterprises of imported white-faced cattle cards are mainly Finnish Forestry Co., Ltd. Beijing Office Department, Jiangsu Hongyu Economic and Trade Co., Ltd. and Qingdao Maoyuan Economic and Trade Co., Ltd. etc.
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