Papers for raw and auxiliary materials and accessories for cartons (1)

Corrugated cartons, as an important part of packaging products, have a large share in the market. The main materials for making cartons are: all-wood pulp cattle card, noodle cattle card (kraft linerboard), white-faced bovine card, coated white bovine card, corrugating medium, specialty paper, tea board paper and coated white board paper. This edition will give you a brief introduction:

Corrugated paper core <br> <br> What is corrugated cardboard?

Corrugated cardboard is a multi-layered adhesive body consisting of at least one layer of corrugated core paper sandwich (commonly known as "knocksheet" or "corrugated paper") and a layer of cardboard (commonly known as "cowhide card"). It has high mechanical strength and can withstand collisions and falls during handling. The actual performance of a corrugated box depends on the three factors of the characteristics of the core paper and board and the structure of the carton itself.

Classification of corrugated cardboard

According to different combinations, corrugated board can be divided into the following five types:

1. A cardboard consisting of a layer of core paper and a kraft card is referred to as a "crocodile cardboard". This type of paperboard is generally used only as a mat, spacing and irregular shape of the package.

2. The cardboard consisting of a layer of core paper and two upper and lower layers of leather cards is called "single pit cardboard".

3. Two-layer core paper is divided into three layers of leather card called "double pit cardboard." Double pit cardboard can be composed of pit papers with different pit widths and different paper qualities, such as "B" pit paper with "C" pit paper.

4. The three-layer core paper is divided into four layers of leather card called "three-hole cardboard."

5. Extra strong double cardboard is developed from single-deck cardboard. The middle layer of core paper consists of two thick core papers. After decades of exploration and development, today's domestic manufacturers have been able to produce a variety of different combinations of corrugated cardboard. These cardboards have different qualities and strengths to meet the changing needs of the market.

Core paper material

The larger the corrugated cardboard hole diameter, the stronger its rigidity. The toughness of the board is derived from the core paper layer without the need for hard fillers. This will reduce the weight of the board and its cost. Core paper can be made from semi-chemical pulp, which provides the best paper strength, and recycled paper stock. The latter, because of the low cost, is happy to be adopted by Hong Kong manufacturers. Although the paper strength is not as good as the former, it can be improved by the paper mills adding starch.
The pit pattern holds a certain space in the corrugated paper, and its role is also very important. It can withstand flat pressure, lateral pressure and other irregular pressures.

At present, the main production and sales companies of domestic corrugating medium mainly include Anhui Huoshan Dongfeng Paper Co., Ltd., Fujian Longhai Beixitou Civil Paper Mill, Guangzhou Youngs Corrugated Paper Mill, Foshan Shiwan District Xingda Printing Material Trade Center, and Guangdong. The province's Dongguan Zhenxing Paper Co., Ltd., etc.; import corrugated paper production and sales companies are mainly Norocom (Hong Kong) Co., Ltd. Shanghai office, Shenzhen Jialing Trade Co., Ltd. and Hong Kong Newport International Paper Co., Ltd. and so on.

Foreign imports of corrugated box production paper mainly from the United States, Japan, Finland, Canada and other countries imported quantitative 360g/m2 cattle card and 180g/m2 corrugated paper, there is also a part of the 337g/m2 cattle card and 160g/m2 corrugated paper . In order to improve the production of corrugated paperboard for domestic use, some paper-making companies have also begun trial production of kraft linerboards (kraft cardboard) of 360g/m2 and 420g/m2. Subsequently, due to the construction of some paper-making companies' products and corrugated box production paper production enterprises, many items of paperboard production paper were produced, and various grades and weights of cardboard and corrugated paper were put on the market. The paperboard manufacturers had room for choosing cardboard. increase. Corrugated board national standards (GB-6544-86) require corrugated box production of paper materials must meet the requirements, the use of cardboard paper rations were 250g/m2, 280g/m2, 300g/m2, 320g/m2, 360g/m2, The corrugated base paper is 125g/m2, 150g/m2, 180g/m2, so that the weight of single and double corrugated paperboards is about 1000g/m2 to 1100g/m2, and the quality of the carton is ensured on the basis of quantitative assurance.

Leather card

Kraft cards constitute the inner and outer layers of corrugated cardboard, and their function may be structural or decorative. Each layer of kraft card provides a variety of characteristics for the cardboard, and these characteristics can be expanded by bonding, waxing and other processing processes.

Light coated white cattle card

Lightly coated white cow cardboard: It is coated with a very thin coating layer on the basis of the white cow cardboard. The air knife coating method can be used to coat the surface of the paper smoothly. It not only has the printing advantage of coated paper, but also has the characteristics of easy printing of white cow cardboard. Because the light-coated coating is very thin, the thin coating does not easily break and fall off, and the coating remains very uniform. The high quality coatings based on china clay can make the ink better absorbed on paper. Such paper printing ink can be quickly dried in a short time, the ink drying quickly can improve the printing production efficiency, and even can directly print the press line slot, on some ink printing machines with drying device can be connected line folding or die cutting produce.

At present, the production and sales of domestic coated white nougat cards mainly include Dongguan Longteng Paper Co., Ltd., Tangshan Xinyuan Paper Co., Ltd., Shandong Dezhou Shuangxing Industrial Co., Ltd., and Shaanxi Baxter Paper Co., Ltd.; The production and sales companies of Bubai Niuka mainly include Qingdao Guanyu Paper Co., Ltd. and the United States Kangweima Shanghai Office.

Intaglio preprinted substrates must use coated white paper with good surface smoothness, strong printability, and stable moisture content (6% to 7%). Imported coated cattle card and domestic gray board can meet the high-end color corrugated cardboard paper distribution requirements. Finland M-REAL Forestry Co., Ltd. is famous for producing coated paper with high hygiene standards. 185g of coated paper has been widely used in domestic preprinting machines. The quantitative range of paper is from 150g/m2 to 350g/m2. U.S. Mead Paper has been using 500g of raw wood pulp to coat cowskin gravure printing cartons and canned beer cartons, which are stronger than corrugated cartons.

At present, the domestic production and sales of all-wood pulp cattle card companies mainly include Fujian Qingshan Paper Co., Ltd., Heilongjiang Jiamusi Paper Group Co., Ltd., Guangxi Forestry Xupu Paper Co., Ltd., Dongguan Haolong Paper Co., Ltd. and Shanghai. Dechang Line Paper Co., Ltd., etc.; Production of imported all-wood pulp bullocks. Slightly selling companies include International Jifeng Paper Group (offices in Beijing, Guangzhou, Shanghai, etc.), CNG Paper's US office in Beijing. , Harbin Tianyu Paper Co., Ltd., Qingdao Xinzheng Cheng Trade Co., Ltd., Shanghai North Yarisong Trade Development Co., Ltd. and Zhejiang Hengtong Paper Industry (Jiashan) Co., Ltd. etc.

Foreign kraft linerboards generally use 100% natural wood pulp, but also use natural wood pulp noodles to waste pulp as a base. Due to the high content of long fibers, the physical strength of the paperboard is relatively increased, and it has good moisture resistance and is suitable for large-scale production. The shortage of wood resources in China generally uses 40% to 50% wood-colored wood pulp noodles, with wheat straw, rice straw, or waste pulp as the base. The physical strength of the board depends on the different ratio of pulp and straw, but generally about 20% of the natural wood pulp noodles, about 80% of wheat straw, straw, waste pulp mixed bottom kraft board paper for bottom sizing. This type of linerboard is moderate in price and has become one of the most used for the production of corrugated paper for domestic use.

White Noodle Card: It is divided into coated white cow card and white noodle cow card (nickel card with bleached wood pulp).

The production and sales companies of domestically produced Noodle Bull (kraft linerboard) mainly include Anhui Shanying Paper Co., Ltd., Beijing Paper Mill No.7, Fujian Quanzhou Cardboard Factory, Dongguan Liwen Paper Mill Co., Ltd., and Hebei Luquan City Shun. Hair Industry Company, Xinmi City Xinghua Paperboard Factory of Henan Province and Beichen Paperboard Co., Ltd. of Inner Mongolia, etc.; production and sales companies of imported dried nougat calf (kraft linerboard) mainly have Austrian Weihan Co., Ltd. Beijing Representative Office, Zhongbao International Trade Co., Ltd., Jining Oriental Packaging Co., Ltd., Shanghai Jingyi Packaging Materials Co., Ltd. and Tianjin Xingshan International Trade Co., Ltd. etc.

The production and sales of domestically-made white noodle cards mainly include Fujian Minqing Paper Co., Ltd., Nantong Zhongpai Paper Co., Ltd., and Zhejiang Dongxing Paper Co., Ltd.; the production and sales companies of imported white nougat cards mainly include the Finnish Forestry Co., Ltd. Beijing Office. Office, Jiangsu Hongyu Economic and Trade Co., Ltd. and Qingdao Maoyuan Economic and Trade Co., Ltd. etc.