Paper moisture measurement and control are critical in the process of making paper products since moisture content directly impacts the product’s quality, stability, and efficiency of converting operations. Excess moisture in paper can affect its physical properties, such as strength, dimensional stability, and printability. It can also promote mold growth and make the paper more susceptible to tearing and wrinkling. On the other hand, paper that is too dry can be brittle and prone to cracking.
Do moisture meters really work?
Moisture meters are indeed effective in accurately determining the moisture content of paper. These devices utilize various technologies, such as capacitance, resistance, and infrared, to measure the moisture present in the paper. The measured values are then displayed on the meter’s digital screen, providing real-time information about the paper’s moisture levels.
Types of moisture meters
There are two main types of moisture meters for paper:
- Pin-type moisture meters: These meters use two pins that are inserted into the paper to measure the electrical resistance between them. The resistance is then converted into a moisture content reading.
- Non-contact moisture meters: These meters use infrared sensors to measure the amount of infrared radiation emitted by the paper. The amount of radiation emitted is related to the moisture content of the paper.
Each type of moisture meter has its advantages and disadvantages. Pin-type moisture meters are more accurate but can damage the paper, while non-contact moisture meters are less accurate but do not damage the paper.
Factors affecting the accuracy of moisture meters
Several factors can affect the accuracy of moisture meters, including:
- The type of paper: Different types of paper have different moisture contents, which can affect the accuracy of the reading.
- The thickness of the paper: Thicker paper may be more difficult to measure accurately than thinner paper.
- The temperature of the paper: The temperature of the paper can affect the moisture reading.
- The calibration of the moisture meter: Moisture meters must be calibrated regularly to ensure accurate readings.
Using moisture meters
To use a moisture meter, follow these steps:
- Calibrate the moisture meter according to the manufacturer’s instructions.
- Place the moisture meter on the paper.
- Press the button to take a reading.
- Read the moisture content from the digital display.
Moisture meters are a valuable tool for measuring the moisture content of paper. By understanding the different types of moisture meters and the factors that affect their accuracy, you can use them to ensure that your paper meets your desired moisture specifications.