Industries in the Paper Manufacturing subsector make pulp, paper, or converted paper products. The manufacturing of these products is grouped together because they constitute a series of vertically connected processes. More than one is often carried out in a single establishment. There are essentially three activities. The manufacturing of pulp involves separating the cellulose fibers from other impurities in wood or used paper. The manufacturing of paper involves matting these fibers into a sheet. Converted paper products are made from paper and other materials by various cutting and shaping techniques and include coating and laminating activities.
Improved GRU prediction of paper pulp press variables using different pre-processing methods
Predictive maintenance strategies are becoming increasingly more important with the increased needs for automation and digitalization within pulp and paper manufacturing sector.Hence, this study contributes to examine the most efficient pre-processing approaches for predicting sensory data trends based on Gated Recurrent Unit (GRU) neural networks. To validate the model, the data from two paper pulp presses with several pre-processing methods are utilized for predicting the units’ conditions. The results of validation criteria show that pre-processing data using a LOWESS in combination with the Elimination of discrepant data filter achieves more stable results, the prediction error decreases, and the predicted values are easier to interpret. The model can anticipate future values with MAPE, RMSE and MAE of 1.2, 0.27 and 0.30 respectively. The errors are below the significance level. Moreover, it is identified that the best hyperparameters found for each paper pulp press must be different.
Researchers Consider the Circular Economy in Pulp and Paper Industries
The paper and pulp industries can benefit greatly from a cyclical model of manufacture. These industries are responsible for the consumption of most of the lignocellulosic biomass produced in the world. In 2020, the European paper and pulp industries alone consumed an estimated 146.5 million cubic meters of wood. The transition to a green economy approach is a chief concern in these industries.
Tree to Box: The Billion Dollar Cardboard Business
ABB’s Paper Mill Technology Helps Renewcell Turn Old Clothes Into New Fabrics
In recent years, the pulp and paper industry has gone from having a reputation of being dirty and environmentally unfriendly to being a leader in sustainability and pollution control. Now the technologies that enabled that transition are being used to help the textile industry too. And the players involved are restarting a shuttered paper mill in Sweden to make it happen, once more providing good-paying jobs for the area.
Renewcell is the Sweden-based scaleup at the center of it all. The company developed a sustainable process that recycles waste textiles into a product called Circulose, whose name is the tip-off that it’s aimed at making fashion circular.
Robotic Inspection for Aboveground Storage Tanks
Aboveground Storage Tanks (AST) are vital assets for many industries including, power, paper and pulp, oil and gas, chemical, and even beverage production. Routine inspection of external and internal tank components is beneficial for understanding its condition and is required by federal and local laws and regulations. Robot-enabled ultrasonic testing (UT) offers a unique solution to AST inspections because they save plant operators valuable resources while providing more asset coverage and actionable data.
Reducing Energy Costs by 8% by Optimizing Autogenous Mills
The grinding process alone accounts for 80% of the energy consumption. It consists of pulverizing limestone blocks to obtain the calcium carbonate used as a mineral filler in paper pulp.
Mills are the plant’s main equipment:
- 5 x 355 kW autogenous mills operating without prior crushing;
- 20 electric mills of various powers between 250 and 355 kW.
The case presented concerns only the autogenous mills, which are the most energy-consuming.
From Logs to Logging On: Paper Machines Built With Digital Manufacturing
ANDRITZ, an Austrian company that manufactures machinery for pulp and paper mills, is using digital manufacturing and artificial-intelligence (AI) processes to save millions of dollars. Skilled workers and engineers on ANDRITZ production lines are now able to take advantage of data-driven support as standard. 3D modeling and digital twins also give ANDRITZ a competitive advantage by guiding operators safely through maintenance and repairs and ensuring transparent access to data.
Process Control in Pulp and Paper Production
Numerous pH and conductivity sensors must ensure process quality at the various production stages during pulp production. Chemical pulping that is too intensive, or dosages of bleaching agents and residue that have not been monitored sufficiently, can damage fibers easily and reduce their strength, especially during boiling or bleaching. Such damage can only be detected in final quality controls, in which the cardboard or paper is tested for tear length, tear strength, and resistance to bursting. The intensity of the chemical pulping must therefore be monitored and regulated. This is done using conductivity measurements, in which the white liquor concentration in the pulp boilers is monitored.