Special paper
Special paper mainly refers to cultural and packaging paper that is different from ordinary printing paper, such as coated paper, offset paper, newsprint. This kind of paper usually requires special paper processing equipment and processes, and the finished paper processed has rich colors and unique textures. With the development of the packaging and printing industry, the demand for special paper in the domestic market is increasing. Special paper has become an indispensable group of paper products. Its varieties are becoming more and more diverse, and its scope of application is also expanding.
classification
1. From the pulp. Special paper pulp has higher quality requirements, mostly pure wood pulp, more long fibers, and some also contain cotton. After making such paper pulp, it has good strength and toughness, good paper stiffness and elasticity, and bright colors. The pulp of ordinary paper is equipped with a certain proportion of non-wood fibers, the paper is easy to turn yellow, and generally needs to be coated.
2. From the point of view of dyeing, it can be divided into pulp dyeing and post-dyeing: pulp dyeing is to add toner when the paper is made into pulp, so that the color is evenly distributed in the paper fibers, the paper color is saturated and uniform, and the cross section is the same inside and outside. After dyeing, after the paper is formed, the pigment is dyed on the surface of the paper by infiltration, the color stability is inferior to that of pulp dyeing, and it is easy to discolor when it is in water, and white edges appear when the dark paper is folded, which destroys the overall effect.
3. From the point of view of embossing method, it can be divided into front embossing and back embossing: front embossing refers to the soft felt when the pulp is not completely dehydrated, so that the paper fibers are distributed according to the natural texture of the felt, forming a special texture of paper. The paper texture of the front embossing process is natural and delicate, and will not damage the paper fibers. After embossing, the finished paper passes through the engraved steel roller, and the mechanical pressure is used to make the paper produce patterns. The advantages of post-embossing are simple process, relatively low cost, and convenience. However, this process is harmful to paper fibers, so the quality of the base paper directly affects the quality of the finished paper after embossing. The pattern of the back embossing pattern changes little, compared with the front embossing pattern, it is slightly mechanical and dull.
How to use special paper's own characteristics to make it better perform in the packaging field?
1. Make full use of the emotions and feelings expressed by the texture color and texture effect of the paper, and achieve a simple and beautiful artistic effect through the simple design of the finishing touch. At the same time, it can also achieve the purpose of saving printing costs.
2. Use special techniques: die cutting, pressing and bumping, anodized aluminum hot stamping, UV glazing, oiling, etc. Because special paper contains many long fibers, it has good stiffness and toughness, suitable for die cutting and bulging. Many specialty papers have a rich texture and texture, which can achieve special effects in contrast to anodized aluminum, UV glazing, and oily gloss.
At present, the production and sales enterprises of domestic special paper mainly include Beijing Zhuwei Paper Co., Ltd., Chongqing Jixing Packaging Co., Ltd. and Hunan Lengshuitan Paper Mill (Yongzhou Xiangjiang Paper Co., Ltd.), etc .; the production and sales enterprises of imported special paper are mainly There are Xiamen Xinyoulian Trading Co., Ltd., Dayong Paper Trading (Shanghai) Co., Ltd. and Conner Jackson Overseas Trading (Far East) Co., Ltd. Shanghai Representative Office.
Tea board paper
Tea board paper, corrugated paper, cardboard, etc. are all paper products used for packaging, usually with a gram weight between 150g and 400g, and some have a lower gram weight. Compared with other packaging and paper, tea board paper is a bottom paper product, and its burst resistance index and ring pressure index are lower than the requirements of national standards for qualified products, but it is still widely used due to its price advantage. Coated tea board paper is available on the market.
At present, domestic teaboard paper production and sales enterprises mainly include Linfen Youyi Paper Mill in Shanxi Province, Manyuan Hongyuan Welfare Paper Mill in Baoding, Huiji Paper Co., Ltd. in Xinji City, Hebei Province, and Pengfei Paper Co., Ltd. in Zhaoyuan County, Heilongjiang Province , Nanchang Great Wall Paper Co., Ltd., Anshan Federal Cardboard Co., Ltd., etc.
Coated white paper
What is coated whiteboard
Coated whiteboard paper belongs to the category of packaging paperboard. It is a processed paperboard that is finished after finishing with white paint on the original paperboard. Its basis weight is generally above 200g / m2, and its thickness is above 0.1mm. It is mainly used for making packaging boxes after single-sided color printing. Performance characteristics of coated whiteboard
Coated whiteboard paper has high whiteness on the coated surface, good smoothness, ink absorption and printing gloss. The cardboard itself has good stiffness and folding resistance, so it can perform high-quality color offset printing and gravure Printing, which can meet the requirements of packaging, is a high-quality material for making high-end commodity packaging boxes.
Types of coated whiteboard
Coated whiteboard paper is divided into A, B, and C according to different quality levels. When choosing, several aspects such as product type, specification and quality grade should be considered.
Type A whiteboard paper: bleached chemical wood pulp is used on the surface, and sulfate wood pulp, mechanical wood pulp, fine waste paper, etc. are used for the core layer and the bottom layer. It has good folding resistance and is used to produce small cartons.
Type B whiteboard paper: Use bleached chemical wood pulp or fine white waste paper for the surface, and use waste paper pulp for the core and bottom layers.
Type C whiteboard paper: Uses lower-grade raw materials than type B whiteboard paper and is no longer produced.
Coated white paper structure
Coated whiteboard paper is composed of secondary coating layer, surface layer, core layer, bottom layer, primary or secondary coating layer, as shown in Figure 1: 1 layer and 5 layers are coating layers, its role is to improve coating Whiteness and printing effect of whiteboard paper; the 2nd and 4th layers are sulfate wood pulp, mechanical wood pulp, and deinked waste newsprint pulp. Its function is to maintain the strength and whiteness of the whiteboard paper; the 3rd layer is mixed waste newsprint Pulp, waste magazines, and waste corrugated board pulp are used to increase the thickness of whiteboard paper, reduce the cost of whiteboard paper, and improve the ink absorption of whiteboard paper.
Classification and technical indicators of coated white board
The classification of coated white board varies from country to country. At present, there are mainly two types of single-sided coated gray paperboard and double-sided coated white cardboard. The basis weight of single-sided coated gray paperboard is 200g / m2, 220g / m2, 250g / m2, 270g / m2, 300g / m2, 350g / m2, 400g / m2, 450g / m2; The basis weight is 200g / m2, 220g / m2, 250g / m2, 270g / m2, 300g / m2, 350g / m2, 400g / m2.
Coated white paperboard is generally dominated by flat paper with dimensions of 787mm × 1092mm, 880mm × 1230mm, and reeled white paperboard is also available. The technical indexes of single-sided coated gray paperboard can refer to QB1011-91 standard, and the technical indexes of double-sided coated white cardboard can refer to ZBY32024-90 standard.
Technical requirements for coating whiteboard
1. High strength. High strength is the basic performance of packaging materials.
2. Has good processing performance.
3. Have good printing adaptability. It is suitable for offset printing, gravure printing and other printing methods.
4. Light weight and proper cushioning. Whiteboard paper has these characteristics, which is very beneficial to protect the contents and improve transportation performance. At present, the domestic production and sales enterprises of coated whiteboard paper mainly include Foshan Huafeng Paper Co., Ltd., Hebei Qiu County Native Paper Co., Ltd., Shijiazhuang Huayang Paper Co., Ltd., Laizhou Hongxin Coated Paper Co., Ltd., Fuyang Yongxing Paper, etc.
common sense
The distinction between paper and cardboard
According to its thickness, it is divided into paper and cardboard. Thick paper with a weight of more than 200g per square area is traditionally called cardboard, and paper with a weight less than 200g is called paper. However, with the improvement of mechanical equipment, materials, and process technology, there has been tissue paper board, also known as light corrugated paper and cardboard. Its category has exceeded the usual 200g. It is also divided into heavy corrugated board production line and production machinery. Lightweight corrugated board production line.
At present, there are about 5,000 types of paper and paperboard in the world, and there are currently 500 to 600 types of paper and paperboard produced in China. The main varieties used for product packaging are cardboard paper, corrugated base paper, whiteboard paper, yellow board paper, kraft paper, glass cardboard, tar paper, coated paper, offset paper, coated paper, special paper, rubber coated base paper, etc. There are two main types of corrugated paper boxes: corrugated cardboard and corrugated base paper.
For liner board, the color of the paste is better than the color of the paste, and the front and back sides are the easiest to identify. Some paper or paperboard is made with a multi-cylinder paper machine or calendered by a calender, and the difference between the reverse and the front is not so obvious. At this time, the following methods can be used for identification:
1. Direct observation method. Fold the paper or cardboard and observe the surface shape structure on both sides. If there is paper machine screen printing, the screen printing surface is the reverse side. When it is unclear to observe with the naked eye, it can be measured with a magnifying glass or a smooth instrument.
2. Observation method with carbon paper pressure paper. Press the carbon paper on the paper surface, then observe the paper surface and make a mark on the paper to make the mark of the carbon paper press on the paper to draw a black mark about 13mm wide and 51mm-76mm long. During observation, it can be placed on a smooth surface glass and identified according to method 1.
3. Use the coin method (aluminum) for marking. Fold the paper so that both sides are placed on a flat surface, use a coin to make a mark on both sides, and then observe the depth of the marks on both sides. The lighter side is the reverse side. This is due to the low filler content on the mesh surface and the scratches are not easily visible.
Vertical and horizontal identification of paper or cardboard
Paper and cardboard have a certain directionality after screen printing. Generally, the parallel to the running direction of the cardboard is the longitudinal direction, and the perpendicular to the running direction is the horizontal direction.
Vertical and horizontal directions can usually be identified by the following methods:
1. Visual method. Some flat paper can distinguish the vertical and horizontal directions with a little attention, and it is more obvious when looking at the light. The direction of the fiber arrangement is the longitudinal direction, and the length direction of the web is the horizontal direction.
2. Tear method. If it is difficult to determine the vertical and horizontal directions by visual inspection, the cardboard can be torn by hand, if the slit is straight and smooth, it is longitudinal; if the slit is oblique or zigzag, or even the level of the paper at the slit, it is horizontal. Or it can be distinguished according to the paper strip and paper quality, the one with high tensile strength is the longitudinal direction.
3. Tensile instrument measurement method: use a special tensile testing machine to test, the larger value is the longitudinal direction, the smaller value is the horizontal direction.
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