As one of the basic industries, the paper industry involves high temperature, high viscosity, highly corrosive media, and complex working conditions in its production process, which requires high equipment stability and measurement accuracy. The anti vibration diaphragm pressure gauge has become an important monitoring tool in the papermaking process due to its structural design, corrosion resistance, and anti vibration ability. This article will analyze from four aspects: technical principles, industry requirements, application scenarios, and selection points.

1、 Technical principles and core advantages

Vibration resistant diaphragm pressure gaugeDiaphragm isolation deviceComposed of a pressure gauge, the measuring medium is isolated from the core components of the pressure gauge through a diaphragm to prevent corrosive media from directly contacting the instrument components. Its core advantages include:

Corrosion resistance: The membrane material can be selected from stainless steel, Hastelloy, etc., to meet the measurement needs of corrosive media such as acid, alkali, chloride ions, etc. in the papermaking process.

Anti vibration performance: Durable pressure gauges are used as matching gauges to effectively eliminate the interference of medium pulsation and equipment vibration on measurement, ensuring stable readings.

Compatibility with high viscosity and solid particles: filled with high viscosity working fluids such as methyl silicone oil or glycerol, it can measure media containing pulp fibers and filler particles to avoid clogging.

Wide temperature range adaptation: covering the working temperature range-40℃to70℃Meet the requirements of high-temperature steaming, low-temperature bleaching and other working conditions in the paper workshop.

2、 The core demand for pressure monitoring in the paper industry

Pressure control in the pulp making section:

Pressure monitoring of cooking pot: Chemical pulping requires lignin removal under high temperature and pressure, and pressure fluctuations directly affect cooking efficiency and fiber quality. The vibration resistant diaphragm pressure gauge can monitor the pressure of the cooking pot in real time to ensure process stability.

Bleach tower pressure monitoring: oxidation bleach (such asClO₂）It has strong corrosiveness, and the pressure gauge needs to withstand chloride ion erosion while avoiding reading distortion caused by medium pulsation.

Optimization of paper-making process:

Pressure balance of the slurry box: Fluctuations in the pressure of the slurry box can lead to uneven paper quantification. The vibration resistant diaphragm pressure gauge can accurately monitor the conveying pressure of the slurry, and work with the control system to achieve uniformity optimization.

Pressure regulation in the pressing section: The gap pressure between the pressing rollers directly affects the dryness and strength of the paper sheet. The pressure gauge needs to withstand the impact of high viscosity slurry and have anti vibration ability to adapt to high-speed operating equipment.

Coating and post-processing steps:

Coating machine pressure control: The coating liquid often contains particles such as glue and pigments. The pressure gauge should avoid clogging, and the coating roller pressure should be monitored to ensure coating uniformity.

Super calender pressure monitoring: The control of paper surface flatness under high temperature and high pressure relies on precise pressure feedback, and the vibration resistant diaphragm pressure gauge can work stably150℃The above environment.

3、 Typical application scenarios and cases

case1Chemical pulp cooking system of a large paper mill

Problem: Traditional pressure gauges frequently fail due to chloride ion corrosion, leading to uncontrolled cooking pressure and decreased fiber yield.

Solution: Adopting Hastelloy diaphragm anti vibration diaphragm pressure gauge, combined with glycerin filling liquid, the service life is extended to3Over the years, the cooking efficiency has improved15%.

case2Coating pressure control in specialty paper production

Problem: The coating solution contains high concentrations of titanium dioxide particles, and ordinary pressure gauges are prone to clogging, resulting in significant fluctuations in coating thickness.

Solution: Choose a large-diameter flange connection type vibration resistant diaphragm pressure gauge, with the diaphragm surface specially polished to reduce particle adhesion80%The rate of coating waste has decreased22%.

case3Monitoring of Ink Removal Line Pressure for Waste Paper Pulp

Problem: The corrosiveness of the de ink agent and the fluctuation of the slurry cause the pressure gauge reading to jump, affecting the flotation effect.

Solution: AdoptV.H.4Grade anti vibration diaphragm pressure gauge, connected with a damper, with a pressure fluctuation suppression rate of up to90%Improve the efficiency of ink removal10%.

4、 Selection points and maintenance suggestions

Key parameters for selection:

Membrane material: Hastelloy alloy is preferred for the chemical slurry section, and coating section is optional316Lstainless steel

Connection method: Choose hard pipe connection for high temperature working conditions（≤200℃）Choose flange type for high viscosity media（≤25MPa）.

Accuracy level: Selection of key workstations such as the slurry box1.5Level, optional auxiliary workstations2.5Grade.

Maintenance precautions:

Regular calibration: every6Perform zero and range calibration once a month to ensure measurement accuracy.

Diaphragm inspection: Visually inspect the surface of the diaphragm every quarter, and replace it immediately if corrosion or scratches are found.

Working fluid replacement: every2Replace the filling fluid once a year to avoid seal failure due to aging.

V. Conclusion

The anti vibration diaphragm pressure gauge solves the technical problem of measuring pressure in high-temperature, high viscosity, and highly corrosive media in the paper industry through diaphragm isolation, anti vibration design, and the application of corrosion-resistant materials. The precise monitoring capability from chemical pulp cooking to coating processing provides key guarantees for process optimization, quality improvement, and equipment safety. In the future, with the transformation of the paper industry towards intelligence and greenness, vibration resistant diaphragm pressure gauges will be further combined with IoT technology to achieve remote monitoring and predictive maintenance, promoting high-quality development of the industry.