First, the type of micro-corrugated board design and corrugated roller structure
One of the characteristics of the fine corrugated file is that it has a large number of turns and the corrugated base paper is lighter in weight and lower in strength. Taking the number of turns per 300 mm as an example: G type is 185±12, N type is 200±15, O type is 267, and B type is 50±2. With a pair of corrugated rollers of the same diameter, the number of turns in which the fine corrugations mesh is increased by 3 to 5 times that of the B-type corrugations. It can be seen that the tension during paper feeding and molding has doubled. Therefore, the 楞-type design must ensure that the 楞-type package angle value is within the strength of the corrugated base paper, and the selection of the dome-shaped arc should make the corrugated base paper's entry resistance smaller, smoother and smoother. At the same time, the crucible type angle should make the corrugated structure satisfy the sufficient rigidity and mechanical strength of the micro-corrugated cardboard. The corrugated surface of the micro-corrugated corrugating roller requires a higher roughness requirement and must be finely ground and polished in order to ensure high-speed molding of corrugated base paper with low basis weight and low strength.
The basic parameters of fine watts:
楞型EFGNO Others
UV UV UV UV UV UV
Number of turns / 300mm 90 ± 10124 ± 10185 ± 12200 ± 15267 Design and design
楞 high 1.1 ~ 1.50.7 ~ 0.80.5 ~ 0.650.4 ~ 0.50.25 ~ 0.35 design
Shrinkage ratio 1.29 ~ 1.391.22 ~ 1.261.20 ~ 1.251.15 Design 1.14 Design and design
For fine corrugated production, moving parts such as corrugating rolls and their associated pressure rolls, coating rolls, and metering rolls require higher accuracy of motion. Corrugated rolls and pressure rolls must also be more uniformly shaped and composite line pressure in order to ensure Cardboard quality. Therefore, the corrugated roll and the pressure roll must be uniform in wall thickness, and the cylindricity accuracy can be maintained after heating. At the same time, a reasonable condensate discharge system structure design is also required to ensure that the corrugated roll is not stopped due to stagnant water at the bottom of the roll. To the upper and lower temperature differences and bending deformation. The corrugating roller and the pressure roller must have a medium-height accuracy with a more reasonable and consistent line pressure. The fine corrugated height is very low, and the high abrasion of over 0.1 mm will affect the quality of the product. For the fine corrugated corrugating roll, more wear-resistant surface layer quality is required.
Fine corrugated corrugating roller wind groove form, vacuum suction type and positive pressure air cushion type are annular groove, vacuum suction type annular groove and herringbone type semicircular arc suction groove. The wind grooves of the corrugated rollers of the fine corrugated rollers need to be narrower, so as to ensure that the finished products are not prone to degumming in the wind grooves.
