2019.09.16
0
The pressure plate can be described as the final quality checkpoint for corrugated board quality. It performs the final pressing operation before board forming. Sub standard pressure plates will render all wet section efforts futile. Therefore, pressure plates play a vital, non negligible role in corrugated board quality control.
A wide variety of pressure plate products populate today’s market. Many lack flexible adjustment capability or feature irrational layout, which leads to debris accumulation on hot plates. Others cannot automatically adjust pressing area and pressure magnitude according to board ply count, material grade and production speed. They simply exert force onto canvas belts and thus fail to improve board flatness — these points require further improvement.
Some double facer machines replace pressure plates with pressure rollers. Although they yield partial benefits, many legacy model rollers have non precision machined surfaces and poor concentricity. Long term thermal cycling causes deformation, and wear develops on bearing housings at both ends, giving rise to severe roller run out. Run out becomes especially pronounced when passing canvas belt joints, where hard joints make point contact with rollers. Sustained roller run out weakens or destabilises pressing against boards and hot plates. Impact from run out acting on canvas belts may even damage corrugated profiles. Roller based systems cannot flexibly adapt to boards of varying web widths, so consistent board quality cannot be guaranteed.
Other equipment employs airbags to press canvas belts. A well known property of airbags is maximum pressure at their lowest point, creating uneven force distribution over canvas belts. Under prolonged operation, high pressure zones accelerate hot plate wear. Uneven force distribution increases belt friction and driving load, which negatively impacts both board quality and hot plate service life and makes quality assurance difficult.
Guangdong Crown Way Intelligent Tech. Co., Ltd.
The founders Qi Haoquan and Song Jinsheng not only have in-depth research on the logistics transportation of the entire factory,
At the same time, he also has a deep understanding of corrugated forming equipment,
Explore a practical experience on how to control the quality of cardboard.
Newly improved by CrownWay Intelligent Technology
Constant pressure hot press plate,
Won the favor of many customers,
It further improves the flatness of the cardboard,
Improve production line speed,
And it also extends the lifespan of the canvas belt due to reduced wear and tear.
Characteristics of constant pressure hot press plate
Flat design, with hard chrome plating on the bottom of the board, smooth and durable, reducing friction, and ensuring even and stable pressure;
Adopting a special spring and cylinder constant pressure design, it effectively overcomes the instability of traditional pressure plates and ensures the adhesion between corrugated and cardboard;
Automated PLC+touch screen control, with humanized parameter settings;
Adopting proportional valve control to increase pressure based on vehicle speed, with an effective and precise constant pressure system;
More effective than traditional pressure rollers in adjusting heat transfer, making the cardboard fit better and the quality more stable;
Design to effectively minimize the wear of cotton tape (paperless wide edge board can be improved);
Automatically adjust the pressure of different materials for three-layer/five layer/seven layer cardboard;
Compared to traditional roller repair and maintenance, it saves more costs.
Main configuration and technical parameters
Improvement after installation
Improved flatness of cardboard: The overall contact area between the cardboard and the hot plate increases, and the overall heating area of the cardboard increases, with even force distribution, improving the gelatinization of the cardboard and achieving better moisture drying effect;
Steam temperature reduction: Due to the increased contact area of the cardboard and good heating, the overall temperature of all double-sided machines can be reduced compared to before. The temperature reduction does not affect the gelatinization of the cardboard, resulting in better flatness of the cardboard
Production speed increase: Due to the reduced friction and driving force of the canvas belt, as well as the improved gelatinization and flatness of the cardboard, after connecting the production pipe control, the pressure plate will automatically adjust according to the speed and door width, making the double-sided conveyor belt travel more smoothly. Therefore, the production speed can generally be increased by 10% -20%;
The lifespan improvement of canvas belts: Traditional use of pressure rollers or airbags can increase the lifespan of canvas belts from 60 to 80 million meters. By using a constant pressure hot press plate, the wear of the belt is reduced, and the lifespan can be extended to 15% or more than 20 million meters.
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jim@chinacrownway.com
121 Baoying Road, Mingcheng Town, Gaoming District, Foshan City,.Guangdong Province
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