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When selecting the medium and high speed corrugated board production line, the following issues should be paid attention to:
First, product market research is the basis of equipment selection
Corrugated carton products are a kind of products with large import and export. Considering the increased cost of freight and the timeliness of delivery, the market area of such products is doomed to not cover too large a range. The market scope is usually locked within 200 kilometers. Therefore, the decision-maker must investigate the main specifications and shapes of the major potential customers' products in the surrounding area, so as to have a clear idea and provide a basis for the next decision.
In addition, we should also understand the equipment status, management status and customer status of the surrounding competitors, so as to provide a basis for the formulation of the next marketing measures.
Second, consider the matching of the overall coordination of the corrugated board production line
The selection principle for medium and high speed corrugated cardboard production line is to take into account the level of automation of each single machine, and pay more attention to the overall matching and coordination of the corrugated cardboard production line. Since the high-speed production line is selected, the configuration matching the whole line with a high degree of automation should be selected.
For example, it needs to be equipped with automatic paper receiving machine (according to the overall line speed, select the paper receiving machine with the appropriate speed, and the number is determined according to its own economic situation), positive-pressure cassette single-sided corrugated machine (convenient for roll change, stable operation and fast speed), production management system, internal expansion clamp (for the sake of safety, multi-point brake must be selected), full-automatic thin knife slitter (2 sets are required for quick order change) The slitter shall be equipped with three types of line pressing wheels (convex to concave, concave to convex, convex to flat), screw cross cutting machine, automatic glue making system, glue coating machine (using pressure-regulating contact pressure bar instead of pressure roller), and the number of hot plates of the double-sided machine shall match the speed (the dryer shall use spring-type hot plate, of course, the advantages and disadvantages of the condensate drain valve must be paid attention to), etc.
Third, focus on the key of selecting core components
Several important technical points of corrugated roll
For high-speed machines, the diameter of single-sided machines should not be less than 320mm, otherwise, it is difficult to raise the speed. Generally, the diameter of the corrugated roller is more than 375mm.
At present, the most commonly used single-sided machines on the market are mostly non-fork type external suction vacuum single-sided machines or positive-pressure cartridge type single-sided machines. In actual operation, it is necessary to control the matching pressure (matching clearance), parallelism, surface temperature of the corrugated roll, and select the appropriate medium and high.
Of course, the control of the surface temperature of the corrugated roller (usually 160-180 ℃) is closely related to the saturated steam pressure and the discharge of condensate. We know that saturated water vapor, after flowing into the corrugated roller, releases latent heat and condenses into condensate. Due to the low thermal conductivity of the condensate, if it is not removed smoothly and accumulated in the roller, it will greatly increase the thermal resistance of the roller, resulting in the decrease of the surface temperature of the roller and the inability to work at the normal speed.
When the condensed water in the roller accumulates to a certain extent, the outlet of the drain pipe is covered. Because the saturated steam pressure in the roller is greater than the pressure at the end of the drain pipe, the pressure difference at both ends makes the condensed water continuously discharged. Therefore, the port of the condensate discharge pipe must be installed downward, and the end should be as close as possible to the inner wall of the lower part of the roller body, so as to drain the condensed water as much as possible. Of course, the nozzle cannot contact the inner wall, because the roller is rotating, while the condensate drain pipe and steam rotary joint are fixed, otherwise noise will be generated and the drain pipe will be damaged. The fixed straw is usually made at an angle of 45 ° to the lower bottom.
