What is the molding vulcanization process

Forming vulcanization process is the most commonly used process for preparing silicone products. Its preparation method is simple, the product quality is good, and it is the most convenient and fastest process in batch production.

1. Forming and vulcanization process - molding machine pressure

It refers to the set pressure of the molding vulcanization machine, which is controlled by a pressure gauge and a computer. Sufficient pressure can cause the mold to close, and the rubber material can be fully pressed into the mold, ending the vulcanization of the rubber. A small amount of water is generated to generate bubbles, and exhaust can control the product's bubbles. The rubber material has high hardness, poor flow, high selection pressure, high pressure, and is prone to squeezing the mold blade. The pressure is related to the shape and size of the mold. If the mold size is small, the pressure should also be reduced accordingly to prevent deformation of the mold and vulcanizing machine plate. When adjusting the pressure of the vulcanizing machine, the maximum pressure of the vulcanizing machine must not exceed the maximum pressure of the vulcanizing machine, otherwise it may damage the machine, etc. Non pressurization of empty molds (excluding injection molds) is an effective measure to protect the mold blade and extend the mold life.

2. Forming and vulcanization process - temperature control of the machine

Forming temperature: When the formula is fixed, the temperature is the foundation of vulcanization, and if the temperature is not enough, the rubber material cannot react; Excessive temperature leads to brittle deformation of the product; Usually, silicone is less than 170 degrees Celsius, and the curing speed is slow, requiring an extension of time; When the temperature is above 180 degrees, the curing speed is fast and the yield is high, but it is prone to mold stains, glossiness, product deformation, size reduction, thickness exceeding standards, and brittle hair edges.

3. Molding and vulcanization process - control molding and vulcanization time

Time is the most important process for silicone product manufacturers, and the length of vulcanization time directly affects the quality of the product. Short curing time, immature product, large deformation, easy whitening, and non durable product; If the time is too long, the product will experience excessive sulfur, resulting in a decrease in strength and hardness, leading to brittleness or surface adhesion. The relationship between temperature and time must be determined based on the thickness of the product and the type of rubber, and thick products must undergo long-term vulcanization at low temperatures. If the time after the mold is out is not enough, the product is not cooked and adheres to the mold, making it difficult to clean and clean the mold. It should be reshaped and vulcanized. Basically, the material can stick down. One of the biggest problems with molding is that employees adjust their machines, resulting in product waste.