Analysis and comparison of the production process

Analysis and comparison of honeycomb paperboard production process

main analysis points: 1. Core making; 2. Gluing; 3. Stretching; 4. Compound; 5. Compaction; 6. Slitting; 7. Splicing; 8. Special treatment; 9. Heating and drying; 10. Crosscut

paper honeycomb composite, as a new type of green environmental protection material, will be more and more widely used with the continuous improvement of environmental protection requirements, the continuous expansion of the use market, the continuous improvement of process performance, and the continuous updating of equipment manufacturing level. Its market prospect is very broad

at present, there are two main aspects that restrict the development of paper honeycomb composites: one is the problem of moisture-proof and waterproof; The second is the imperfection of production equipment performance and production technology, and the problem that the development of subsequent equipment for honeycomb products failed to keep up in time. There are two ways to solve the problem of moisture-proof and waterproof: first, it will be improved with the continuous development of moisture-proof technology; Second, the reduction of service conditions and the continuous improvement of application environment will be solved, such as disposable use, container transportation, non open storage, etc. The imperfection of production equipment and production process mainly refers to unstable product quality, low production efficiency and excessive material waste, which will be solved as soon as possible due to the promotion of market development and the continuous efforts of manufacturers with a wide range of production equipment and speed regulation

here today, as an engineering technician who has been engaged in design work in the carton machinery industry for more than ten years, I participated in several honeycomb paperboard industry conferences in 1998, and later participated in the design and development of honeycomb paperboard equipment. I have a little superficial understanding and understanding of the honeycomb paperboard production process, and deeply feel that an ideal equipment must have a good technology. Honeycomb paperboard equipment does not have high-end technology. It depends on whether the process is advanced and the design is perfect. Many of its technologies are the same or similar to corrugated paperboard technology. In the consumption of about 110000 tons of lithium carbonate, I am willing to offer some immature opinions on the production process of honeycomb paperboard, so as to help and inspire the product development of equipment manufacturers and the understanding of users on the equipment. First of all, I will not comment on any manufacturer's equipment, but only express some views on the production process of honeycomb paperboard. There are shortcomings. I hope you can make more comments and jointly promote the development of China's honeycomb paperboard industry

the honeycomb paperboard manufacturing process (refers to the bonding molding process) has three forms as a whole: 1. Single machine operation; ① Zero sheet paper type, single-sided gluing type, double-sided gluing type; ② Web type; 2. Unit operation type; 3. Production linkage line type; ① Separate type of core making and board making; ② Core making and board connecting type (or separate core making)

I. core making (the manufacturing process of honeycomb paperboard is mainly different from that of core making): 1. Winding type: a layer of base paper with double-sided adhesive tape and staggered adhesive strips is combined with another layer of base paper by winding to form a paper core block, which is then cut by a paper cutter. There are octagonal angle type and wire crank type. Features: ① the process is easy to realize; ② Braking device is required for intermittent operation; ③ It is difficult to run at constant speed and tension; ④ Paper pellets are difficult to dry quickly; ⑤ Restricted by the paper cutter; 2. Cascade type: 1. Zero sheet type: stack the gummed sheets of paper; 2. Web type: glue two, four and six layers of base paper, then cut and stack them to form paper pellets, and then cut them into core strips by paper cutter. Characteristics: ① zero sheet type is easy to realize; ② Convenient for continuous production; ③ Complex design (continuous production); ④ Paper pellets are difficult to dry quickly; 3. Paper strip docking type: glue and compound the four and six layers of base paper, and then cut it into horizontal strips to form a continuous paper core. Characteristics: ① no paper core block, no paper cutter; ② Easy for continuous production; ③ It is difficult to stabilize the high speed; ④ Small waste; 4. Continuous paper strip type: glue and compound four and six layers of base paper, and then cut into longitudinal continuous paper strips to form a continuous paper core. Characteristics: ① no paper core block, no paper cutter; ② Easy for continuous production; ③ The width of the paper core changes with the thickness of the paper core; ④ Small waste

II. Gluing: gluing process: 1. Core bonding; 2. Core bar butt joint; 3. Paperboard lamination; Glue application method: 1. Glue spraying: spray the glue liquid at a certain pressure to the glue application place with a glue spraying machine or glue pump. Features: ① it is easy to change the type of honeycomb; ② Simple structure; ③ The spray amount should track the change of vehicle speed. 2. Gluing: a gluing method that uses a rubber roller to transfer the glue solution to the gluing surface. Gluing method: 1. Immersion type: the gluing roller is directly immersed in the glue liquid. It is characterized by simple structure. 2. Quantitative roller transfer type: use the quantitative roller to transfer the glue liquid to the coating roller. It is characterized by adjustable gluing amount and complex structure. 3. Roller type: use pits to hold the glue. It is characterized by a large amount of glue and is not easy to throw glue. Gluing form: 1. Longitudinal gluing: use the annular groove of the gluing roller or the glue spraying head to apply the interval strip glue along the travel direction of the base paper. It is suitable for high speed, easy to ensure the gluing position, and the width of the paperboard is limited by the width of the base paper. It is suitable for winding, stacking, paper butt joint and other core making methods. 2. Horizontal gluing: use the longitudinal groove or longitudinal stripe of the gluing roller to apply horizontal spacer strip glue on the base paper. Features: ① if it is not limited by the paper cutter, the width of the paperboard is not limited by the width of the base paper; ② The paper speed and gluing speed should be controlled synchronously; ③ It is easy to throw glue along the groove at high speed. It is suitable for laminated and continuous paper strip core making. 3. Full width gluing: corrugated type, smooth roller type; Glue the base paper with a round roller. It is characterized by full roll surface gluing, which is suitable for paper gluing of paperboard composite and gluing on the two advantages firmly controlled by the Lengyu union group. No matter what kind of gluing form, quantitative gluing should be adopted, and the glue amount can be adjusted, so that the quality can be easily guaranteed and the cost can be reduced

III. stretching: 1. Width limiting stretching: use the width limit to pull the core strip apart. It is characterized by easy realization and uneven horizontal force, which is suitable for single machine operation. 2. Differential stretching: use the speed difference to pull the core strip apart. There are traction roller + damping roller type; Traction roller + damping plate and differential combination. Features: the speed difference should be adjustable, suitable for unit operation and production line. 3. Combination of differential speed and width limit: applicable to the production line where the core bar needs to be butted. 4. Horizontal stretching: pull the paper core strip horizontally, which is characterized by the change of strip speed during the stretching process. It is suitable for continuous strip production line

IV. compounding: 1. Paper core and face paper compounding ① surface gluing: bonding is easy to ensure, the amount of glue is large, and it is not easy to dry. ② Gluing on the ridge: the bonding is difficult to control, the amount of glue is small, and it is easy to dry. Now it is generally believed that the composite quality of gluing on the ridge is not easy to guarantee. The five elements to ensure the compound quality of gluing on the ridge are: ① choose the right kind of glue; ② Proper gluing method; ③ The stability of the relative position of the face paper and the ridge when compounding; ④ When compounding, a certain amount of pressure should be applied; ⑤ Appropriate temperature should be added during compounding; 2. Paper core and other plate composite (also known as hard board composite) cold pressing composite (omitted); Hot pressing composite (omitted)

v. compaction: refers to the process of applying a certain amount of pressure when the paper is bonded. In order to make the bonding effect good, compaction is generally required. The processes to be compacted include: ① paper core bonding; ② Core bar butt joint; ③ Paperboard lamination; Compaction: 1. Press compaction: ① positioning compaction; ② Beat compaction: Several presses compact at a certain beat, which is mainly used for core making. 2. Extrusion compaction: core strip butt joint and paper strip butt joint adopt extrusion compaction. 3. Roller compaction: ① continuous roller compaction, characterized by pressure jump, is applied to composite and core bar bonding. ② The transfer belt is combined with the pressure roller. It is characterized by relatively stable pressure change. Horizontal pressure: applied to the splicing of paper strips; Vertical pressure: applied to paperboard lamination

VI. slitting: refers to the process of cutting multilayer bonded paper or paper pellets into paper strips or paper cores. For bonded honeycomb paper cores, the paper should be cut into strips and finally bonded into paper cores. The pressure loss in the three methods increases; Opposite: 1. Paper cutter cutting: use the paper cutter to cut the paper pellets into strips. It is characterized by positioning intermittent cutting, large cutting force, limited cutting thickness and cutting efficiency. The core making process of paper pellets formed earlier shall be applied. 2. Circular knife slitting: use a circular knife to Slitter the paper vertically. It is characterized by continuous cutting during operation. It is used in the core making process of continuous paper strips. 3. Single punching knife slitting: use the single punching knife to cut the paper horizontally on the anvil. It is characterized by fast punching. It is used in the paper strip butt type core making process

VII. Splicing: refers to the process of paper core strip docking and paper strip splicing. Core bar docking: the paper core bar is bonded continuously by extrusion, which is characterized by uneven stress on the bonding surface, and is applied to the core making process that needs to form paper core blocks. Paper strip splicing: 1. Horizontal paper strip splicing: the paper strips are bonded by extrusion and applied to the paper strip butt core making process. 2. Longitudinal paper strip splicing: longitudinal continuous paper strips are bonded by continuous roller extrusion, which is characterized by continuous and horizontal pressure. It is applied to the continuous paper strip core making process. Splicing method: 1. Manual splicing; 2. Semi automatic splicing; 3. Automatic splicing (core strip docking, paper strip splicing)

VIII. Heating and drying: the bonding, moisture discharge and paper core shaping in the production of honeycomb paperboard all need heating. This paper introduces several heating and drying methods used in the production of honeycomb paperboard. Three heating methods: 1. Electric heating: far infrared and microwave drying. It is characterized by convenient control, large energy consumption and high cost. 2. Steam heating: a heating method using steam as the heating medium. It is characterized by soft heating, low limit temperature and low thermal efficiency, involving pressure vessels. 3. Heat transfer oil: a heating method using heat transfer oil as heating medium. It is characterized by wide heating temperature range and small heat loss. It does not involve pressure vessels, and the boiler room is not required

IX. vertical and horizontal cutting: refers to the longitudinal cutting and horizontal disconnection of paperboard. Longitudinal cutting: all adopt round knife high-speed cutting. (multi knife slitting and double knife edge alignment) cross cutting: toothless circular knives are mostly used, and the cutting is controlled synchronously by the travel of large and small vehicles. Control mode: ① computer control; ② Work procedure control; Walking: ① motor, gear rack type; ② Motor and chain type; 3. Pneumatic; Synchronization: ① cardboard drag type; ② Motor + cardboard

X. special treatment: roughening treatment, exhaust treatment and increasing contact surface treatment. 1. Roughening: refers to a method of grinding a rough surface on the vertical edge of the paper core. There are transverse and longitudinal roughening (for the fiber direction), and the longitudinal roughening effect is relatively obvious. Purpose: ① adjust the height error of the vertical edge; ② Increase the soaking ability of the corrugated surface; 2. Exhaust treatment: the treatment method adopted to increase the permeability of paperboard when it is compounded. There are slotting treatment and venting treatment, which are no longer advocated. 3. Increase contact surface treatment: the treatment method adopted to enhance the bonding strength of the composite. There are methods of applying water to collapse the ridge (characterized by increasing the process and energy consumption, reducing the thickness of the paperboard) and increasing the amount of glue to extend the soaking time (increasing the cost, reducing the thickness of the paperboard). (chi Duogong)