With the advancement of industrialization, the use of weighing equipment is becoming increasingly widespread, from traditional market scales and car scales to dynamic weighing systems in modern intelligent logistics systems. The accuracy and stability requirements of weighing equipment are becoming higher and higher. As the core component of weighing equipment, the weighing sensor directly affects the accuracy of weighing results and the long-term stability of the equipment. Therefore, how to ensure that sensors are not affected by external environmental factors, especially moisture, dust, and other harsh conditions, during long-term use has become a major challenge in the weighing industry.
Scale sensors typically use electronic components and sensor chips, which are highly sensitive and susceptible to moisture and external pollutants. Especially in humid environments, moisture may enter the interior through interfaces, causing circuit corrosion, performance degradation, and even damage to sensors. Therefore, encapsulation technology plays a crucial role as an effective protective measure in the production and maintenance of weighing sensors.
Internal sealing of weighing sensor
Sealing materials not only need to isolate moisture and protect components, but also need to ensure good physical properties and chemical stability to avoid affecting the accuracy and lifespan of sensors due to environmental changes. More importantly, the sealed material needs to have easy peelability to facilitate equipment maintenance and repair. With the increasing demand for environmental protection and green materials, traditional sealing materials can no longer meet the requirements of modern industry. Finding a sealing material that is both environmentally friendly and efficient has become an urgent task.
Challenge
- Moisture isolation and hygroscopicity
Scale sensors are often used in humid or highly variable environments, which requires the sealing material to not only isolate external moisture, but also have a certain degree of moisture absorption to absorb the water vapor that may be generated inside the sensor and avoid damage to the circuit caused by moisture. At the same time, due to the small and complex internal space of the sensor, the sealing material needs to have good fluidity and permeability to ensure that it can fully cover every component of the sensor and provide comprehensive protection. - Good physical performance and stability
The sealing material must have excellent physical properties to ensure stable insulation and mechanical strength during long-term use. Especially in precision equipment such as weighing sensors, the sealing material should also have low hardness to avoid stress concentration and damage to internal components. At the same time, the flexibility and low temperature resistance of the material also need to be considered to cope with possible temperature fluctuations and vibrations. - Easy peelability and convenient maintenance
As a long-term device, weighing sensors sometimes require maintenance and replacement. Once the sealing material is cured, it is often difficult to remove, which brings inconvenience to the maintenance of the equipment. How to find a balance between protection and maintenance, so that the sealing material can effectively protect the sensor and be easily peeled off when necessary, is another urgent challenge to be solved.
Solution
In order to solve these challenges, we chose PUR 1618, a two-component solvent-free polyurethane gel, as the main filling material for weighing instrument sensors.
PUR 1618 is a two-component solvent-free room temperature or heat curing polyurethane gel, which is used for two-component sealing and filling. The raw materials are free of heavy metals, environmentally friendly, and have a wide range of process operability. The finished product has high physical properties and good adhesion to the substrate. It can be cured at room temperature or by heating, and can be deeply cured. The two-component mixture has good flowability, extremely low hardness, excellent flexibility, and excellent low-temperature resistance after curing. It is used for pouring and sealing in communication equipment, transformers, control power supplies, ignition controllers, electronic sensors, etc.
- Characteristics of encapsulated products inside the weighing sensor
- Low viscosity, strong operability
Excellent low-temperature characteristics and outstanding weather resistance
Excellent electrical insulation and stability stability
Good waterproof and moisture-proof properties, with extremely low water absorption rate
By using PUR 1618 as the sealing material for the weighing sensor, not only does it effectively solve the adverse effects of environmental factors such as moisture and low temperature, but it also enhances the stability and durability of the equipment. Its low viscosity, good electrical insulation, excellent waterproof and moisture-proof performance, and easy peelability make it an ideal potting solution in modern industry. Whether in the production process or later maintenance, PUR 1618 has demonstrated excellent performance, providing comprehensive protection for weighing sensors and ensuring their long-term stable operation in various complex environments.
Tags: Sensor Internal Encapsulation · Sensor Encapsulation · Encapsulation Materials · Scale Sensor Encapsulation · Connector Encapsulation
