Silicone O-ring is a kind of rubber ring with silica gel as raw material and circular cross section. Because its cross section is O-shaped, it is called silica gel O-ring. At present, it has been widely used in machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, construction machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery, and various instruments.

In the production process of O-ring seals of silicone products, some thorny problems are sometimes encountered. For example, the O-ring seals of silicone products are not connected after molding. The following is the reason why the O-ring seals of silicone products are not connected after molding and the solutions are shared by Beizhite Liquid Silicone Products Factory.

1. Mold temperature is too low

The mold temperature is too low will cause the problem that the silicone O-ring is not connected after molding. The solution is to properly adjust the temperature of the upper and lower molds of the vulcanizing machine.

2. Excessive pressure

If the pressure is too high, the silicone O-ring will not be connected after molding, so the solution in the operation process is to increase the appropriate amount of rubber, followed by a drop in pressure.

3. Too little rubber material

If there is too little rubber material, it can be solved by increasing the rubber material, but there will be the wrong feeling that the adding material will make the product size larger. In fact, the size reduction is not completely solved by material reduction, but also by reducing the pressure and increasing the mold temperature to reduce the size of the product.

4. The mold self-disassembly is too sharp

The mold can be taken to sand blasting, which is equivalent to polishing the mold self-removal opening. But it is best not to do so, because this is a set of silicone sealing ring mold, the mold self-dismantling requirements are very high, silicone molding mold in the continuous use of the process would have worn, if deliberately to sandblasting polishing, it will be difficult to dismantle the edge in the future.

To sum up, silicone O-ring is a widely used silicone product. The most common reason for the non-connection of silicone O-ring after molding is too thin, followed by other factors such as mold temperature, pressure, too little rubber and so on in the production process. Therefore, it is suggested that the problem of non-connection of silicone O-ring after molding should be solved according to the actual situation during the manufacturing process of silicone O-ring, don't deal with it blindly, the loss of money will also affect the production efficiency.

The O-ring seal has its own sealing function and does not need to be adjusted periodically. When it is used for sliding sealing, the sealing performance can not be affected by the direction of movement. It is small in size and convenient to use, but it is inevitable that there will be leakage. The liquid silicone explains the reasons for the leakage of the O-ring.

1. there are gaps on the surface of the product, product size deviation or mold size deviation and other two reasons.

The 2. bearing force cannot reach the shock absorption and buffering effect, that is to say, the lack of toughness of the material is related to the temperature and time during molding.

The main reasons for 3. raw materials, aging rate, tensile rate, and hardness of several reasons, and finally the impact of the environment, different environments on the product will have different oxidation reactions, a long time will begin to appear problems!

Flow marks and burrs of silicone O-rings

Silica gel O-ring flow marks and burrs, determine the good silicone raw materials and related additives, such as: silica gel is ordinary silica gel or platinum vulcanized silica gel? Color masterbatch with a colorant or pre-dispersion?

Because the flow mark is related to silica gel mixing, reducing the mold temperature and fully mixing can reduce or eliminate the flow mark.

For the reasons for the burr problem:

1. The material weight is too large; 2. Exhaust too many times, mold temperature is high.

Solution: The joint line of the mold needs to be polished with oil stone. Add frozen trimming, etc.