Synchronous control solution for high-speed paper machine system

The control solution for the high-speed paper machine system with long-speed synchronization between batches (ice pressing, drying, optical pressing, coiling…) helps the system to operate stably, easy to operate, to produce quality products, increase machine efficiency, minimize waste and effectively save electricity.

Papermaking is the process of forming a paper structure and turning the pulp solution into a finished paper. The paper machine is a combination of many transmission parts and is divided into 2 parts: wet part and dry part.
The wet part is composed of powder injection box, mesh unit, stone press unit. The powder sprayer is responsible for evenly spraying the pulp solution onto the mesh. The newly formed paper is then passed through the stone press to squeeze out the water and increase the bond between the fibers.

The paper after passing through the wet part is still very moist (about 60%) will be dried to about 92% in the dry part, including pressing and drying rolls placed in series. In order to increase the quality and smoothness of the paper, at the end of the drying process there are also optical laminates. Finally, the finished paper will be rolled into large rolls by the roll collector.

Old-style operating method, machine parts are controlled separately for each batch.

CUSTOMERS’ DIFFICULTIES

Easy to break paper, many waste products, uneven product quality
Low machine speed, low production efficiency
Almost no change in paper weight
Difficult to adjust, difficult to paper and troubleshooting
Regular maintenance of motors and mechanics affects production progress

SOLUTION ANALYSIS

DAT provides 3 synchronous solutions and improves efficiency for paper machines:

Solution 1: Synchronization solution using only GD200A inverter with machine speed < 100m/min, using analog control method or high frequency pulse link to synchronize the system in master-slave mode.
Solution 2: Synchronous solution using open-loop inverter GD200A and PLC + HMI with machine speed up to 150m/min, using analog control method, high frequency pulse or communication according to Modbus, Profibus, etc. standards through PLC – HMI
Solution 3: Synchronous solution using closed-loop inverters GD35/GD350 and PLC + HMI to control and monitor with machine speed up to > 200m/min, use communication such as Modbus, network, etc. precise control with 0.02% error

SOLUTION ADVANTAGES

Synchronized system, easy to operate
Avoid paper breakage, easy to troubleshoot
Easily change machine speed and change paper weight
Easy and intuitive parameter setting and monitoring using the HMI display
Smooth start inverter, motor protection, mechanical shock resistance
Complete solution, available warehouse, 24/7 service

Are you still hesitant, worried about efficiency?
Take a look at DAT's specialized solution design process.

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Products for solutions

GD20 - a new generation of high-performance general-purpose inverters for general machine building applications. GD20 uses state-of-the-art open-loop vector control technology with outstanding controllability.

GD200A - for both variable torque loads (P loads) and constant torque loads such as conveyors, mixers, mills (G loads).

GD35 - advanced closed-loop vector control with 7 control modes: speed, position, torque, speed/torque, position/speed, position/torque and speed control full closed loop control.

GD350 - INVT's most advanced multi-function inverter series with world leading vector control technology, meeting diverse control requirements with high efficiency.

PLC - IVC1L is a high-quality, easy-to-program PLC, widely applied with fast processing speed, strong communication ability.

PLC - IVC3 is a high performance PLC series integrated with INVT's latest technology, CE and RoHS certified.

The HMI VT/VK Series is a Human-Machine interface that is applied in the automation industry with many display modes, fast data processing speed, large capacity, and simple operation.