Quali fattori hanno un impatto maggiore sulle maniche in silicone? - 25+ anni Srtub Food Medical Grade Silicone Tube Manufacturer

Silicone sleeve can be said to be a more important material in daily life, especially in some chemical and industrial aspects, but the tolerance of some silicone tubes is different, which affects the tolerance of silicone sleeve What are the main factors of size? Today Srtub will help you introduce it.

The first case: due to the influence of the temperature of the machine head.

Under the same extrusion conditions, if the temperature of the machine head is too low, the inner diameter of the extruded silicone sleeve becomes larger, and the wall thickness of the silicone hose becomes thinner; when the extrusion temperature is higher, the inner diameter of the silicone hose becomes smaller, Then the wall thickness of the silicone hose becomes thicker.

The second case: due to the influence of the melting point and fluidity of the extruded material.

The fluidity of the material is closely related to the temperature. As the temperature increases, the apparent viscosity of the material decreases and the fluidity is good. When the temperature of the machine head is lowered, the apparent viscosity of the material is higher, and the fluidity is poor. Forced extrusion increases the pressure of the machine head, and the released tube blanks undergo elastic recovery due to the release of stress, and their expansion degree is also the same as before. It is directly proportional to the pressure, and at the same time, the poor fluidity of the material makes the material extrude less, resulting in a larger inner diameter of the silicone hose and a thinner wall thickness. As the temperature gradually increases, the flow performance of the extruded material in the machine head is improved, the pressure of the machine head is reduced, and the elastic recovery of the die pipe is also reduced due to the stress, and the inner diameter of the extrusion is reduced; on the other hand , The amount of material extruded increases with the improvement of flow performance, which makes the wall of the silicone hose thicker.

Tubi in silicone

The third case: the influence of different screw speeds and traction speeds.

At the same temperature, the diameter and wall thickness of the extruded silicone sleeve have a great relationship with the screw speed and pulling speed. As the extrusion speed increases, the inner diameter of the silicone sleeve will become larger and the tube wall will become thinner. The lower the temperature of the die, the more obvious this change will be. This is mainly because as the extrusion speed increases, although the viscosity of the material decreases with the increase of the shear stress (shear strength), due to the high processing pressure of the silicone melt, the viscosity increases with the increase of the extrusion pressure. It has also been improved. At this time, the flow performance of the material depends to a large extent on the external heating temperature.