Tag Archive for: Liquid silica gel

What are the advantages of liquid silicone encapsulation in smart wearables?

The application of liquid silicone rubber (LSR) in smart wearable devices is becoming increasingly widespread, mainly due to its unique material properties and processing technology. The following are the main advantages of liquid silicone encapsulation in smart wearable devices:

1. Biocompatibility and safety

Food grade material: Liquid silicone meets food grade standards, is non-toxic and odorless, and will not cause harm to the human body. It is particularly suitable for smart wearable devices that come into direct contact with the skin, such as smart watches, health monitoring bracelets, etc.
Biocompatibility: Liquid silicone has good biocompatibility and will not cause skin allergies or irritation, making it suitable for long-term wear.

2. Temperature resistance and weather resistance

High temperature resistance: Liquid silicone can maintain its physical and chemical properties in high temperature environments, making it suitable for smart wearable devices used in high temperature environments.
Low temperature resistance: Liquid silicone can maintain good elasticity and flexibility even in low temperature environments, making it suitable for smart wearable devices used in cold environments.
Weather resistance: Liquid silicone has excellent weather resistance, which can resist ultraviolet rays, oxidation, and aging, ensuring stable performance of smart wearable devices during long-term use.

3. Elasticity and Flexibility

High elasticity: Liquid silicone has extremely high elasticity and can recover to its original shape after multiple bending and stretching, ensuring that smart wearable devices are not easily deformed during use.
Flexibility: Liquid silicone has good flexibility and can adapt to smart wearable devices of different shapes and sizes, providing a comfortable wearing experience.

Liquid silicone is widely used in smart wearable devices
and has become an indispensable material for smart wearable devices.

4. Waterproof and dustproof properties

Waterproof: Liquid silicone has excellent waterproof performance, which can effectively prevent moisture infiltration and ensure the normal operation of smart wearable devices in humid environments.
Dustproof: Liquid silicone has good dustproof performance, which can effectively prevent dust and particulate matter from entering the interior of the equipment, extending the service life of the equipment.

5. Chemical resistance and corrosion resistance

Chemical resistance: Liquid silicone can resist the erosion of various chemicals, ensuring that smart wearable devices will not corrode or deteriorate when in contact with chemicals.
Corrosion resistance: Liquid silicone has good corrosion resistance, which can resist the erosion of corrosive substances such as acid and alkali, ensuring the long-term stability of smart wearable devices.

6. Advantages of processing technology

Injection molding: Liquid silicone adopts injection molding technology, which can achieve the processing of complex shapes and fine structures, ensuring the appearance and functionality of smart wearable devices.
Automated production: The liquid silicone injection molding process is suitable for automated production, which can improve production efficiency and product consistency, and reduce production costs.

7. Antibacterial performance

Antibacterial agent addition: Adding antibacterial agents to liquid silicone can effectively inhibit bacterial growth, improve the hygiene performance of smart wearable devices, and is particularly suitable for health monitoring devices.

8. Comfort and aesthetics

Comfort: Liquid silicone has a soft touch and good breathability, providing a comfortable wearing experience, especially suitable for smart wearable devices that can be worn for a long time.
Aesthetics: Liquid silicone can achieve multiple color and transparency choices by adding colorants, meeting the aesthetic needs of smart wearable devices.
In summary, liquid silicone encapsulation has multiple advantages in the field of smart wearables, including water and dust resistance, good biocompatibility, excellent weather resistance and stability, efficient processing performance, and environmental sustainability. These advantages make liquid silicone encapsulation an indispensable and important material in smart wearable devices.

/by

What are the molding processes for liquid silicone products?

The molding process of liquid silicone products mainly includes the following:

1、 Liquid Injection Molding (LIM)

Liquid injection molding is the process of injecting liquid silicone into a closed mold for solidification molding. This process has efficient production speed, precise product size and detail control ability, making it very suitable for mass production of complex shaped silicone products. For example, in fields such as automotive components and electronic product casings, the application of LIM technology has greatly improved production efficiency and product quality.

2、 Injection molding

Injection molding is the process of placing liquid silicone gel in an open mold and curing it into shape through heating and pressure. This process is relatively simple, with low equipment costs, and is suitable for small and medium-sized batch production. Pressure injection molding is particularly suitable for producing products of different shapes and sizes, such as silicone seals, buttons, etc. Although its production speed is slow, it has certain advantages in cost control and flexibility.

3、 Transfer molding

Transfer molding is the process of injecting liquid silicone into a mold cavity, filling the entire mold with pressure, and then heating and solidifying it. This process is particularly suitable for producing products with complex shapes and multi cavity molds. Transfer molding can reduce waste and improve material utilization, while ensuring the dimensional accuracy and surface quality of the product. The application of transfer molding technology is becoming increasingly widespread in fields such as medical devices and precision instruments.

Molding process of liquid silicone products

4、 Injection molding

Injection molding is the process of pouring liquid silicone directly into an open mold and forming it through natural curing or heating curing. This process is simple and easy to implement, with low mold costs, making it very suitable for small-scale production and prototype making. Injection molding plays an important role in the early stages of product design, as it can quickly verify the feasibility of design schemes and adjust and optimize them.

5、 In Mold Injection Molding

In mold injection molding is the process of injecting liquid silicone into a mold and combining it with other materials such as plastic and metal to form a mold. This process enables the perfect combination of different materials to produce composite products with unique properties and appearance. The application of in mold injection molding technology has greatly enriched the types and functions of products in fields such as consumer electronics and smart homes.

6、 Extrusion molding

Extrusion molding is the process of extruding liquid silicone into a specific shape (such as a long round tube) through an extruder. The extruded silicone products can be cut arbitrarily, with flexible and versatile shapes, and are widely used in medical, video equipment and other fields. For example, medical supplies such as silicone catheters and infusion tubes are often produced using extrusion molding technology.

7、 Dropping molding

Dropping molding is the process of solidifying liquid silicone gel into a mold through a dropper device. This process is suitable for producing products with small batches, complex shapes, and fine structures. Dropping molding can achieve high-precision material control, but the production speed is slow.

In summary, there are various molding processes for liquid silicone products, each with its unique advantages and applicable scenarios. Choosing the appropriate molding process is crucial for improving production efficiency and product quality.

/by

How to control the product size of liquid silicone sealing rings?

In the manufacturing industry, liquid silicone sealing rings are widely used as high-performance sealing materials in various fields such as electronics, medical, automotive, aerospace, etc. Its excellent high and low temperature resistance, aging resistance, chemical corrosion resistance, and good elastic recovery ability make it a key component to ensure equipment sealing and reliability. However, in the production process of liquid silicone sealing rings, how to accurately control product size to ensure product consistency and meet strict customer requirements is a major challenge faced by manufacturers.

1、 Mold Design: Foundation and Key

The mold is the basis for forming liquid silicone sealing rings, and its design directly affects the dimensional accuracy, appearance quality, and production efficiency of the product. Firstly, the selection of mold materials is crucial, requiring good heat resistance, wear resistance, and corrosion resistance to ensure the stability and accuracy of the mold under long-term high-temperature and high-pressure operations. Secondly, the design of the mold structure needs to consider the flow characteristics of liquid silicone, reasonably set the gate position, quantity, and size, as well as the exhaust system, to ensure uniform material filling and avoid adverse phenomena such as bubbles and material shortages.

In order to accurately control product dimensions, molds also need to be equipped with high-precision measurement and adjustment systems, such as precision cavity size measurement tools, temperature control systems, etc. The mold temperature has a significant impact on the flowability, curing speed, and final product size of liquid silicone. Therefore, through precise temperature control, the injection molding process can be optimized and the stability of product size can be improved.

2、 Injection molding process: details determine success or failure

The injection molding process is the core link in the production of liquid silicone sealing rings, which directly affects the dimensional accuracy and intrinsic quality of the product. During the injection molding process, parameters such as injection pressure, injection speed, holding time, and cooling time must be strictly controlled. Excessive injection pressure may cause product deformation or mold damage, while insufficient pressure may result in incomplete filling; Injecting too quickly may cause turbulence, affecting the surface quality of the product, while injecting too slowly may prolong the production cycle.

The pressure holding stage is particularly crucial for preventing product shrinkage and ensuring dimensional stability. By adjusting the holding time and pressure, the solidification process of liquid silicone in the mold can be effectively controlled, reducing dimensional deviations caused by uneven shrinkage. In addition, the reasonable setting of cooling time is also an important factor in ensuring the stability of product size. Too fast or too slow cooling speed may affect the final size and performance of the product.

Need to optimize mold design, precise injection molding proces

3、 Post processing: optimization and improvement

After injection molding of liquid silicone sealing rings, a series of post-treatment processes are required, including demolding, trimming, cleaning, inspection, etc. Although these processes may seem simple, the final control of product size is equally important. When demolding, it is necessary to ensure that the product is smoothly and undamaged removed from the mold, avoiding dimensional changes caused by external forces. During the trimming process, excess burrs and burrs should be removed to maintain a clean appearance of the product, while avoiding excessive trimming that may affect dimensional accuracy.

The cleaning steps are not only to remove stains and residual release agents from the surface of the product, but more importantly, to maintain the cleanliness of the product surface and prepare for subsequent inspection and packaging. The inspection process is the last line of defense for product quality control, ensuring that every product meets design requirements through measures such as size measurement and appearance inspection. For products that do not meet the standards, they should be promptly identified, isolated, and reworked or scrapped.

4、 Quality Control: Continuous Improvement and Enhancement

In the production process of liquid silicone sealing rings, quality control is a continuous process aimed at improving the stability and consistency of product dimensions through data analysis, problem tracking, and continuous improvement. Firstly, establish a sound quality management system, clarify the quality standards and inspection processes for each link, and ensure that every step of the operation is systematic.

Secondly, advanced measurement techniques and equipment such as coordinate measuring instruments and laser scanners are utilized to perform high-precision and high-efficiency dimensional measurements on products, promptly detecting and correcting dimensional deviations. At the same time, collect quality data during the production process, use statistical process control (SPC) and other methods for analysis, identify potential quality issues, and take corresponding preventive measures.

In addition, strengthening employee training and improving their quality awareness and operational skills are also important ways to enhance product quality. Through regular skill training, quality awareness education, and quality case analysis, we aim to enhance employees’ awareness of product size control and stimulate their enthusiasm for participating in quality improvement.

silicone injection molding

silicone injection molding

epilogue

The product size control of liquid silicone sealing rings is a complex system engineering involving multiple aspects such as mold design, injection molding process, post-treatment, and quality control. By continuously optimizing mold design, precisely controlling injection molding process parameters, strictly implementing post-processing standards, and establishing a sound quality control system, the stability and consistency of product dimensions can be effectively improved, meeting customers’ strict requirements, and enhancing the market competitiveness of enterprises. In the future, with the continuous development of materials science, manufacturing technology, and information technology, the production of liquid silicone seals will become more intelligent and precise, providing more reliable and efficient sealing solutions for various industries.

/by

What are the defects of liquid silicone encapsulation? How to solve it?

The liquid silicone encapsulation process may encounter some defects in practical applications. Here are some common defects and their solutions:Common defects and solutions

Bubbles and voids:

Defect description: During the encapsulation process, bubbles or voids appear inside or on the surface of the silicone gel.
Solution: Vacuum defoaming: Perform vacuum defoaming treatment before injection to remove air from the silicone gel. Control the glue injection speed: Inject glue slowly and evenly to avoid the formation of bubbles during rapid injection. Choose the appropriate silicone: use low viscosity, easy to flow silicone material.

Poor adhesion:

Defect description: The adhesion between silicone and substrate (such as metal, plastic) is insufficient, making it easy to peel off.
Solution: Surface treatment: Polish, clean or use primer on the surface of the substrate to increase surface roughness and activity. Choose the appropriate silicone: Use silicone materials with good adhesion properties. Control vulcanization conditions: Ensure appropriate vulcanization temperature and time to enhance adhesion.

Inconsistent size:

Defect description: The size of the encapsulated product is inconsistent with the design requirements, and may be too large or too small.
Solution: Precise control of the mold: Ensure accurate mold size, regularly inspect and maintain the mold. Control the amount of glue injected: Accurately control the amount of glue injected each time to avoid too much or too little. Optimize vulcanization process: Ensure stable vulcanization process and avoid size changes caused by uneven vulcanization.

Customized processing factory for liquid silicone encapsulatio

Surface defects:

Defect description: There are defects on the surface of the encapsulated product, such as scratches, unevenness, flow marks, etc.
Solution: Optimize the gluing process: Ensure a smooth gluing process and avoid the formation of flow marks or scratches. Mold surface treatment: Ensure a smooth mold surface, regularly clean and maintain the mold. Control vulcanization conditions: Ensure appropriate vulcanization temperature and time to avoid surface defects caused by uneven vulcanization.

Silicone discoloration or deterioration:

Defect description: Silicone gel may discolor or deteriorate during vulcanization or use.
Solution: Choose the appropriate silicone: Use silicone materials with good high temperature resistance and aging resistance. Control vulcanization conditions: Ensure that the vulcanization temperature and time are appropriate to avoid excessive temperature that may cause silicone gel to deteriorate. Storage conditions: Ensure that the silicone material is stored in a dry and cool environment, avoiding direct sunlight and high temperatures.

Poor fluidity of silicone gel:

Defect description: Silicone has poor fluidity during the injection process, making it difficult to fill the mold.
Solution: Choose low viscosity silicone: Use silicone material with good fluidity. Heating silicone: Heat the silicone appropriately before injection to reduce its viscosity. Optimize the glue injection equipment: Ensure that the glue injection equipment works properly, with appropriate pressure and speed.

summary

The defects of liquid silicone encapsulation technology mainly focus on bubbles, poor adhesion, inconsistent size, surface defects, discoloration or deterioration of silicone, and poor fluidity of silicone. The key to solving these defects lies in optimizing process parameters, selecting suitable materials, precise control of molds and equipment, and regular maintenance and inspection.
If you encounter specific problems or have specific needs in practical operation, please provide more details, and I will do my best to provide you with more detailed solutions.

/by

What is the tolerance control for the secondary molding of liquid silicone encapsulation? Can we seal the glue?

Liquid Silicone Rubber (LSR) encapsulation secondary molding is a precision manufacturing process that involves injecting liquid silicone rubber onto a pre formed plastic part or other substrate. Tolerance control is crucial for ensuring product quality and performance. Here are some general guidelines on tolerances:

During the encapsulation process, liquid silicone gel is injected or poured onto the substrate that needs to be encapsulated, and after curing, it forms a protective layer or connecting layer. Secondary molding, on the other hand, refers to the injection or casting of liquid silicone gel on top of the existing layer of silicone gel on the substrate to achieve more complex structures or functions.

In this process, tolerance control has become a crucial factor. Excessive tolerance may result in liquid silicone not being able to fully cover the corners or gaps of the substrate, leaving a hidden risk of adhesive leakage; The tolerance is too small, and it may also be difficult to form or cause product deformation due to insufficient fluidity of silicone.

So, what is the tolerance control range for the secondary molding of liquid silicone encapsulation? This actually depends on multiple factors, including the viscosity of silicone, injection or casting pressure, shape and size of the substrate, ambient temperature, etc. But generally speaking, we can consider the following aspects:

1、 Viscosity of silicone gel
The viscosity of silicone directly affects its fluidity. Silicone with low viscosity has good fluidity and is easy to fill the corners and gaps of the substrate, but it is also prone to overflow due to excessive fluidity. Therefore, when choosing silicone, it is necessary to select the appropriate viscosity based on the specific application scenario and requirements.

2、 Pressure for injection or pouring
The pressure of injection or pouring is a key factor affecting the filling effect of silicone gel. If the pressure is too low, silicone may not be able to completely fill the gaps in the substrate; Excessive pressure may lead to silicone overflow or product deformation. Therefore, in practical operation, it is necessary to adjust the injection or pouring pressure reasonably according to factors such as the shape and size of the substrate, the viscosity of the silicone gel, etc.

3、 Shape and size of substrate
The shape and size of the substrate have a direct impact on tolerance control. For substrates with complex shapes and high dimensional accuracy requirements, tolerance control needs to be more stringent. In this case, it may be necessary to use higher precision molds and stricter process control to ensure the filling effect of silicone.

4、 Environmental temperature
The ambient temperature has a significant impact on the curing speed and flowability of silicone gel. In high temperature environments, the curing speed of silicone increases and its flowability decreases, so it is necessary to increase the tolerance appropriately to ensure that silicone can completely fill the substrate. On the contrary, in low-temperature environments, the curing speed of silicone gel slows down and its flowability increases, so it is necessary to reduce the tolerance appropriately to prevent silicone gel from overflowing.
Based on the comprehensive consideration of the above factors, we can derive a rough tolerance control range. However, it should be noted that this is only a reference range and not an absolute standard. In practical operation, flexible adjustments need to be made according to specific situations.
To ensure proper tolerance control of the secondary molding of liquid silicone encapsulation, we can take the following measures:
1. Strengthen raw material testing to ensure that the silicone used meets quality requirements;
2. Regularly maintain and upkeep the mold to ensure its accuracy and stability;
3. Strictly control the pressure and time of injection or pouring to ensure that the silicone can evenly and fully fill the substrate;
4. Strictly control the production environment to ensure that parameters such as temperature and humidity meet production requirements;

5. Strengthen product quality testing, promptly handle and provide feedback on non-conforming products.
Please note that these are only general guiding principles. In the actual production process, adjustments and optimizations should be made based on specific product design, material characteristics, and production processes to achieve the best results. If you need detailed recommendations for specific products, please provide more information for more accurate assistance.

/by