Fiber Web Feed System Foam Density Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fiber web machine feed systems lack precise control over foam generation agents, leading to inconsistent web formation and end product properties due to inadequate measurement and control of stock density before and after foam generation.
Innovation Solution
Incorporating measuring equipment in the feed line before and after foam generation equipment to determine stock density, allowing for controlled adjustment of agents affecting foam generation, thereby optimizing foam formation and product properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If foam generation equipment is used to feed agents into the stock, then web formation and end product properties can be improved, but precise control over agent dosage is lost leading to inconsistent quality
Solution Approach 1:
The patent implements a feedback control system where density measurements are continuously taken before and after foam generation equipment, and the control system adjusts agent dosage based on the measured density changes. This closed-loop feedback mechanism ensures precise control over foam generation while maintaining consistent web formation quality.
Solution Approach 2:
The patent monitors and controls the density parameter of the stock before and after foam generation to indirectly control the amount of agents added. By maintaining density within specific ranges, the system achieves precise agent dosage control without direct measurement of agent quantities.
2Quantity of substance
If measuring equipment is installed in the feed line before foam generation, then agent dosage can be optimized, but the system complexity increases
Solution Approach 1:
The patent uses density measurement as an intermediary parameter to control agent dosage indirectly. Instead of directly measuring agent quantities or foam properties, the system measures stock density before and after foam generation, which serves as a proxy indicator for agent concentration and foam formation effectiveness.
3Measurement precision
If density measurement is performed both before and after foam generation, then foam generation can be precisely controlled, but the number of measuring devices increases
Solution Approach 1:
The patent employs feedback control using density measurements taken at multiple points in the feed line. By comparing density values before and after foam generation equipment, the system determines the effectiveness of agent addition and adjusts subsequent dosing accordingly, achieving precise control through information feedback rather than simply increasing measurement frequency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables precise control over foam generation, improving web formation and reducing agent usage by allowing for purposeful dosing based on real-time density measurements, ensuring consistent end product quality.
Implementation Method 1
measuring equipment for determining the density of the stock, adapted in the feed line before and after the foam generation equipment
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a feed system of a fiber web machine, which feed system includes a feed line (12) for taking stock (31) towards a headbox (10) of a fiber web machine, and foam generation equipment (13) adapted in the feed line for the feeding of one or more agents (41) into the stock for foam forming. The feed system further includes measuring equipment (15.1, 15.2) for determining the density of the stock (31, 32, 33), adapted in the feed line before and after the foam generation equipment, and control equipment (16), which has been adapted, on the basis of said determination of density, to control the foam generation equipment for the feeding of one or more agents into the stock for foam forming.