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What are the main factors that affect the error of silicone rubber tube?
The main factors that affect the error of silicone tube are subjective and objective factors. But the main factors are the most subjective factors, the main
The influence of three factors, such as the temperature, the melting point of the material, the flow and the speed of the screw, the speed of the screw and the speed of the machine.
Ring, the following is a detailed description of the.
First case: the impact of the die temperature.
If the die temperature is too low, if the die temperature is too low, then the silicone tube will become larger.
Wall thickness becomes thinner; when the extrusion temperature is high, the inner diameter of the silicone tube becomes smaller, then the wall thickness of the silicone tube is thick.
Second case: the influence of the melting point and the fluidity of the extrusion material.
The flow properties of the material are closely related to the temperature. With the increase of temperature, the apparent viscosity of the material decreases, and the flow property is
Can be good. When the die temperature is reduced, the apparent viscosity of the material is high, the flow performance is poor, and the pressure of the die is increased.
, the tube embryo in the mold is due to the release of the stress and the elastic recovery, the expansion of the pressure before the pressure is proportional to, at the same time
The flow of material is less than that of the material, resulting in a larger diameter of the silicone tube, the wall thickness becomes thin. With the temperature gradually
The flow performance of the extrusion material in the die can be improved, the die pressure is reduced, and the die is also due to the stress elasticity.
The amount of the compound is reduced, and the inner diameter of the extrusion is reduced. On the other hand, the amount of material increases with the improvement of the flow performance, which makes the silicone tube
Wall thickening.
Third cases: the influence of different screw speed and traction speed.
At the same temperature, the diameter and wall thickness of the silicone tube are very much related to the screw speed and the speed of the screw.
. Silicone casing with the increase of the extrusion speed, the diameter of it will become larger, the wall will become thin, the lower the head temperature, the change
The more obvious. This is mainly due to the increase of the extrusion speed, although the viscosity of the material decreases with the shear stress (shear strength).
The increase in the processing pressure of the silica gel is high, and the viscosity of the silicone melt is increased with the increase of the extrusion pressure,
The flow performance of the material depends largely on the size of the external heating temperature.
This paper is from Shenzhen,, id=607?
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