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The relationship between the hanging rain viscosity of ton packaging barrels
Time：
Aug 27,2023
The falling of a ton packaging barrel can cause significant changes in wall thickness and diameter, and even damage the casting billet. For Newtonian fluids, sagging can be controlled by using high viscosity materials. But in reality, most plastics are non Newtonian fluids, and if the melt index is less than 1, sagging will occur. As the temperature increases, the phenomenon of sagging becomes more severe. Due to the viscoelasticity of plastic melts, it is not possible to describe the relationship between melt sagging and viscosity.
There is a viewpoint that the drop of IBC ton billets is determined by the viscoelasticity of the melt, and the linear creep flexibility budget sag calculated from the tensile relaxation coefficient has been obtained. Other viewpoints suggest that the tensile stress growth function is related to sagging. The university pointed out that the process of sagging is neither a constant stress nor a constant strain rate, so there is no direct relationship between sagging and sagging in these physics. It should be noted that when the strain rate is small, a simple viscoelastic fluid model can be used to predict the sagging of ton packaging barrels.
At present, there is no reliable method for predicting sagging behavior based on rheological properties. Therefore, the trend of sagging can only be predicted through empirical methods. Clamping a fixed length and weight extruded part with a mold, monitoring and recording the change in blank length over time, is a simple method for measuring film plasticity.
When considering the effects of outlet expansion and sagging, from a rheological perspective, it becomes more complex. Once the extrusion stops, the length of the IBC ton can blank depends on the expansion and sagging of the outlet. In actual situations, the length of steel billets increases slowly and the rebound is slow. It reflects the complex process of export expansion of time related parts.
A model of ton packaging barrel shaped blanks has been established. The models assume that the ways in which exports expand and decrease are the same. Unfortunately, they cannot predict the type failure behavior under known mold, resin, and process conditions.
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