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What are the production process and characteristics of the silicone extruder?

Time：

2021-09-15

Silica gel extruder process is one of the key methods of silica gel forming processing. Compared with other molding processes, molding has the following advantages: the processing process is continuous, more efficient; low investment, fast results. It can manufacture all kinds of rubber hoses, sealing strips, bars, plastic plates and hollow products.

What are the production process and characteristics of the silicone extruder?

Silicone ExtruderWhat are the production processes and characteristics

Molding is mainly carried out in the extruder, in order to ensure that the whole process of forming is carried out, a molding equipment, generally composed of the following.

1. Extrusion molding system: it is mainly composed of barrel and bolt. According to the extrusion molding system, silica gel is melted into mucous body, which is automatically and uniformly analyzed by screw rod.

2. Transmission system: give the screw the required torque and speed ratio.

3. Heating and refrigeration system: heating and cooling the barrel, screw rod and engine to ensure that the extrusion process is carried out at the required ambient temperature.

4. Engine: According to the extrusion molding system, silicone products with certain geometric structures and specifications are obtained.

5, vulcanized rubber equipment: silicone to carry out heating vulcanized rubber, to get the finished product.

Silicone ExtruderKey points of processing technology:

1. Screw speed: If the screw speed is too high, the temperature of the silicone will be too high, which will cause the silicone to vulcanize the rubber too early and the surface will be sticky.

2. Engine working pressure: The greater the working pressure of the engine, the more the total reverse flow and the lower the total flow, which will also cause too much dry material in the barrel; the working pressure of the engine is too small to squeeze goods with suitable specifications.

3. Feeding equipment: Silica gel is basically cold feeding, which has no effect on extrusion humidity. The key is to feed freely and sufficiently, otherwise the cost will be reduced and glue shortage may also be caused.

Silicone extrusion characteristics:

1. The extrusion characteristics of silica gel are basically similar to those of general-purpose rubber, but the compressive strength of silica gel raw rubber is relatively low, the plastic particles are more sensitive to heat, and have obvious bonding force, so it is difficult for the extrusion process.

2、Silicone ExtruderThe height and diameter should be large, and the air compression ratio should be higher. The screw rod for silicone extrusion shall be of fixed pitch thread, and the blanking end shall be of double thread structure.

3. Silica gel is generally reinforced with white carbon black. The extruder barrel and extruder screw are made of wear-resistant alloy steel. The extrusion expansion coefficient of silica gel is generally relatively small, about 1%.

4. Silica gel extrusion generally uses double two-four and platinum vulcanizing agents. Double two-four has low cost and easy specifications; platinum vulcanizing agent has high product strength, good light transmission and low taste.

5, extrusion silicone should choose liquid phase glue, deposition glue extrusion is easy to produce bubbles, and liquid phase glue light transmission and compressive strength will be better.