Abstract : This article summarizes the variety and quality requirements of carton paper, describes the process control methods for carton production, and looks forward to the development trend of paper carton production technology.
With the continuous development of the market economy, the internationalization of the market has become increasingly evident. The requirements for the packaging of goods are getting higher and higher. As a packaging product that meets today's environmental protection requirements, paper packaging products have become more and more prosperous. Carton as a representative of paper packaging products, with the rapid development of import and export trade, the amount is increasing, the quality and cost requirements are getting higher and higher. It is predicted that the total amount of paper packaging paperboard in China will reach 24 million tons in 2005 and 32.5 million tons in 2010. The paperboard required is mainly high-strength corrugated paper, kraft linerboard, whiteboard paper and coated whiteboard paper. In today's increasingly fierce market competition, how to minimize costs while ensuring quality is the main issue facing cartons and related industries. Carton paper is the main raw material for the production of cartons, and it occupies a pivotal position in the manufacturing cost of cartons. Therefore, the quality of the carton paper and the cost of the carton directly affect the competitiveness of the carton in the market. This paper describes the key process of carton paper production to improve the quality of carton paper and provide technical conditions for the production of inexpensive cartons.
First, the box paper and its quality requirements Currently in the production of paper cartons in the process of the main paper are roughly the following: First, for the production of coffins or corrugated corrugated paper or corrugated paper, its quantitative in the 90-120g/m2 . At present, 112g/m2 is commonly used, and it gradually develops to low-quantity direction. The second method is used for carton cover or bottom liner. Commonly used is normal linerboard or kraft linerboard. 125-400g/m2 or so; the third is used for medium and high-grade carton packaging paper, usually used is white paper, coated white paper or leather coated white paper, the quantitative in 125-400g/m2 or so. With the increasingly fierce competition in the market, the quality requirements for these types of carton papers are getting higher and higher. Table 1 and Table 2 are the national standards for the above-mentioned types of carton paper.
Among the quality indicators listed above, the ring pressure index, burst resistance index, stiffness, smoothness (roughness), folding resistance, and printing performance are the main performance indexes of carton paper, of course, with cardboard, carton, With the continuous development of printing machinery technology, the speed of stand-alone machines is getting faster and faster. Besides the above-mentioned some quality indicators for carton paper, other requirements such as crack length, roughness, and surface printing strength will also increase.
Second, the main raw material for the production of carton paper From the production point of view, there are good quality raw materials may produce a good product. Waste paper, especially waste corrugated cardboard, grass semi-chemical pulp (chemical pulp), hardwood wood semi-chemical pulp (mainly NSSC pulp) unbleached kraft pulp, straw pulp, etc. can be used as raw materials for the production of carton paper. . With environmental protection being increasingly valued by people, and the continuous development of waste paper recycling technology, the waste paper recovered as “urban forest†has become more and more efficient in recycling around the world. Its recycling efficiency in advanced countries has become It reaches 70%. Waste corrugated linerboard (also known as OCC) as the main raw material for the production of carton paper, with the rapid economic development, its demand
Table 2 National Standard for Single-coated Whiteboard Paper QB1011-91
Indicator Name Indicator Level A Level B
Quantitative g/m2 200-450 200-450
The transverse quantitative difference is not more than % 6.0 10.0
Smoothness (coating surface) no less than S 50 28
The tightness is not more than g/cm3 0.82 0.85
The lateral stiffness is not less than mN.m 2.00-13.0 1.7-8.00
Whiteness (coating) not less than % 78.0 78.0
Delivery moisture % % 8.0±2.0
Lateral folding degree greater than 10 5
Degree of dust 0.3-1.5mm2 less than/m2 20 60
Of which 1.0-1.5mm2 black is less than 1 2
Greater than 1.5mm2 is not allowed
Ink absorption (coating side) % 15.0-30.0 15.0-30.0
Printing gloss (applied surface) greater than % 60 35
Printing surface strength (coating surface) greater than m/s 2.0 1.2
More and more. In China, many manufacturers, in addition to using domestically produced OCC, many manufacturers in the coastal provinces rely on imported waste paper, mainly from waste paper in Hong Kong, the United States, Canada, or other European countries. The main reason is that domestic waste paper is of good quality. Or the quantity can not meet the needs of production, especially in quality. In addition, some manufacturers use wheat straw half chemical pulp or even chemical pulp to produce carton paper. This is related to the proportion of raw materials in China's paper industry, a considerable part of the raw materials for grass, but also related to China's waste paper recycling management and policy is not perfect. Therefore, it is certain that with the continuous increase in the demand for paper for carton, the raw material for the production of paper for carton--waste paper is mainly OCC supply will become increasingly tense, how to efficiently use waste paper raw materials will be the concern of the manufacturer. The problem.
Of course, unbleached sulphate wood pulp is generally used as a raw material in the production of high-end boxboard paper, such as kraft linerboard, in order to meet quality requirements.
Third, the paper's main process For the same kind of paper production process, the vast majority of manufacturers are similar, generally in addition to equipment selection or individual links to improve, the other is roughly the same. The following is the main flow of waste paper recycling and the flow of several types of carton paper: 1. The general process of CC waste paper recycling:
Collection of waste paper--Transport of waste paper--Storage and storage of waste paper--Sorting of waste paper--Pulping (hydraulic pulp)--Screening, purification--beating--adjustment of pulp (including adjustment Thick, add accessories, etc.) - Internet - papermaking - roll paper - trimming, packaging. From the above-mentioned process, it can be known that the recycling process of waste paper is actually a process of impurity removal and recycling of waste paper. If impurities in waste paper can be efficiently removed, it will lay a foundation for the production of high-quality paper for carton. basis. 2. Production process of corrugated or cardboard papers 1 Process for production of corrugated medium or corrugated board for all waste paper Waste paper after sorting--conveyor belt--hydraulic pulper--storage tank--high concentration Sand remover (or grit groove)--Multi-fiber separator--ZSL pressure screen (or CX screen)--Concentrate--Pool storage--Beating (usually double-disc grinding)--Pool storage tank- -Pulling box--Pulping pump--Slag remover--Pressure screen (or omitted)--Plant high box (cone or step diffusion type stable pulp box)-On-line copying 2 Unless floated Sulphate wood pulp is used as the binder to produce boxboard paper. The core slurry or bottom slurry can be used in the above process. The batter can be used in the following processes:
Unbleached Kraft Wood Pulp--Hydraulic pulper--Precision pulper--Pool pool--Double disc mill--Pool storage tank--Adjusting box--Pulping pump--606 conical cleaner- - Pressure screen - high box - The difference between the Internet and corrugated paper and cardboard is different in the use of surface, core, and bottom slurry. The main difference is in the processing of raw material slurry and slurry, but the core slurry or The bottom slurry processing process is roughly the same.
With the continuous development of the market economy, the internationalization of the market has become increasingly evident. The requirements for the packaging of goods are getting higher and higher. As a packaging product that meets today's environmental protection requirements, paper packaging products have become more and more prosperous. Carton as a representative of paper packaging products, with the rapid development of import and export trade, the amount is increasing, the quality and cost requirements are getting higher and higher. It is predicted that the total amount of paper packaging paperboard in China will reach 24 million tons in 2005 and 32.5 million tons in 2010. The paperboard required is mainly high-strength corrugated paper, kraft linerboard, whiteboard paper and coated whiteboard paper. In today's increasingly fierce market competition, how to minimize costs while ensuring quality is the main issue facing cartons and related industries. Carton paper is the main raw material for the production of cartons, and it occupies a pivotal position in the manufacturing cost of cartons. Therefore, the quality of the carton paper and the cost of the carton directly affect the competitiveness of the carton in the market. This paper describes the key process of carton paper production to improve the quality of carton paper and provide technical conditions for the production of inexpensive cartons.
First, the box paper and its quality requirements Currently in the production of paper cartons in the process of the main paper are roughly the following: First, for the production of coffins or corrugated corrugated paper or corrugated paper, its quantitative in the 90-120g/m2 . At present, 112g/m2 is commonly used, and it gradually develops to low-quantity direction. The second method is used for carton cover or bottom liner. Commonly used is normal linerboard or kraft linerboard. 125-400g/m2 or so; the third is used for medium and high-grade carton packaging paper, usually used is white paper, coated white paper or leather coated white paper, the quantitative in 125-400g/m2 or so. With the increasingly fierce competition in the market, the quality requirements for these types of carton papers are getting higher and higher. Table 1 and Table 2 are the national standards for the above-mentioned types of carton paper.
Among the quality indicators listed above, the ring pressure index, burst resistance index, stiffness, smoothness (roughness), folding resistance, and printing performance are the main performance indexes of carton paper, of course, with cardboard, carton, With the continuous development of printing machinery technology, the speed of stand-alone machines is getting faster and faster. Besides the above-mentioned some quality indicators for carton paper, other requirements such as crack length, roughness, and surface printing strength will also increase.
Second, the main raw material for the production of carton paper From the production point of view, there are good quality raw materials may produce a good product. Waste paper, especially waste corrugated cardboard, grass semi-chemical pulp (chemical pulp), hardwood wood semi-chemical pulp (mainly NSSC pulp) unbleached kraft pulp, straw pulp, etc. can be used as raw materials for the production of carton paper. . With environmental protection being increasingly valued by people, and the continuous development of waste paper recycling technology, the waste paper recovered as “urban forest†has become more and more efficient in recycling around the world. Its recycling efficiency in advanced countries has become It reaches 70%. Waste corrugated linerboard (also known as OCC) as the main raw material for the production of carton paper, with the rapid economic development, its demand
Table 2 National Standard for Single-coated Whiteboard Paper QB1011-91
Indicator Name Indicator Level A Level B
Quantitative g/m2 200-450 200-450
The transverse quantitative difference is not more than % 6.0 10.0
Smoothness (coating surface) no less than S 50 28
The tightness is not more than g/cm3 0.82 0.85
The lateral stiffness is not less than mN.m 2.00-13.0 1.7-8.00
Whiteness (coating) not less than % 78.0 78.0
Delivery moisture % % 8.0±2.0
Lateral folding degree greater than 10 5
Degree of dust 0.3-1.5mm2 less than/m2 20 60
Of which 1.0-1.5mm2 black is less than 1 2
Greater than 1.5mm2 is not allowed
Ink absorption (coating side) % 15.0-30.0 15.0-30.0
Printing gloss (applied surface) greater than % 60 35
Printing surface strength (coating surface) greater than m/s 2.0 1.2
More and more. In China, many manufacturers, in addition to using domestically produced OCC, many manufacturers in the coastal provinces rely on imported waste paper, mainly from waste paper in Hong Kong, the United States, Canada, or other European countries. The main reason is that domestic waste paper is of good quality. Or the quantity can not meet the needs of production, especially in quality. In addition, some manufacturers use wheat straw half chemical pulp or even chemical pulp to produce carton paper. This is related to the proportion of raw materials in China's paper industry, a considerable part of the raw materials for grass, but also related to China's waste paper recycling management and policy is not perfect. Therefore, it is certain that with the continuous increase in the demand for paper for carton, the raw material for the production of paper for carton--waste paper is mainly OCC supply will become increasingly tense, how to efficiently use waste paper raw materials will be the concern of the manufacturer. The problem.
Of course, unbleached sulphate wood pulp is generally used as a raw material in the production of high-end boxboard paper, such as kraft linerboard, in order to meet quality requirements.
Third, the paper's main process For the same kind of paper production process, the vast majority of manufacturers are similar, generally in addition to equipment selection or individual links to improve, the other is roughly the same. The following is the main flow of waste paper recycling and the flow of several types of carton paper: 1. The general process of CC waste paper recycling:
Collection of waste paper--Transport of waste paper--Storage and storage of waste paper--Sorting of waste paper--Pulping (hydraulic pulp)--Screening, purification--beating--adjustment of pulp (including adjustment Thick, add accessories, etc.) - Internet - papermaking - roll paper - trimming, packaging. From the above-mentioned process, it can be known that the recycling process of waste paper is actually a process of impurity removal and recycling of waste paper. If impurities in waste paper can be efficiently removed, it will lay a foundation for the production of high-quality paper for carton. basis. 2. Production process of corrugated or cardboard papers 1 Process for production of corrugated medium or corrugated board for all waste paper Waste paper after sorting--conveyor belt--hydraulic pulper--storage tank--high concentration Sand remover (or grit groove)--Multi-fiber separator--ZSL pressure screen (or CX screen)--Concentrate--Pool storage--Beating (usually double-disc grinding)--Pool storage tank- -Pulling box--Pulping pump--Slag remover--Pressure screen (or omitted)--Plant high box (cone or step diffusion type stable pulp box)-On-line copying 2 Unless floated Sulphate wood pulp is used as the binder to produce boxboard paper. The core slurry or bottom slurry can be used in the above process. The batter can be used in the following processes:
Unbleached Kraft Wood Pulp--Hydraulic pulper--Precision pulper--Pool pool--Double disc mill--Pool storage tank--Adjusting box--Pulping pump--606 conical cleaner- - Pressure screen - high box - The difference between the Internet and corrugated paper and cardboard is different in the use of surface, core, and bottom slurry. The main difference is in the processing of raw material slurry and slurry, but the core slurry or The bottom slurry processing process is roughly the same.
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