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What are the main factors that influence the tolerance of silicone rubber tubes?
This tolerance is related to a number of factors, which are produced in the production of any product. Silicone tube production is the same, the following is a brief introduction of the main factors affecting the size of the silicone tube tolerance.
The first case: due to the impact of the nose temperature.
Under the same extrusion conditions, if the die temperature is too low, then extruded silicone casing diameter becomes larger, silicone tube wall thickness thinning; when the extrusion temperature is higher, silicone hose diameter becomes smaller, silicone tube wall thickness became thicker.
Second kinds of conditions: the influence of melting point and fluidity of extrusion materials.
The flow property of the material is closely related to the temperature. With the increase of the temperature, the apparent viscosity of the material is decreased and the flow performance is good. When the lower die temperature, material list view of the high viscosity, poor flow properties, forced out of the die pressure increase, from the mode of the pipe blank due to the stress of the discharge and elastic recovery, the degree of expansion also before and was proportional to the pressure, also poor material flow of materials less extrusion, resulting in silicone tube diameter, the wall thickness thinning. Along with the gradual rise in temperature, extrusion material in the die, the flow properties can be improved, die pressure decreases, from the mold tube also stress elastic recovery corresponding reduction, extrusion diameter reduced; on the other hand material extrusion amount increases with the flow performance improvement, the silicon rubber hose wall thickening.
Third kinds of conditions: different screw speed and traction speed.
At the same temperature, the diameter and wall thickness of the extruded silicone tube have a great relationship with the screw speed and traction speed. Silicone tube with the increase of the extrusion speed, its inner diameter will become larger, the wall will become thinner, the lower the temperature, the more obvious this change. This is mainly because with the increase of the extrusion speed, although the viscosity of the material with the shear should force (shear strength increase and decrease, but due to the high silica melt processing pressure, accompanied by the extrusion pressure increases, the viscosity also increased, then the flow properties of the material in a large extent depends on the size of the external heating temperature.
In this paper, from Shenzhen City, Qi Yu Silicone Rubber Co., Ltd.: http://www.qygxj.com
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