Molding system for preparing molded article with orientation effect

A molding system for preparing a molded article, comprising:

• a molding machine, including a barrel, a screw mounted for moving within the barrel, a driving motor driving the screw to move a molding material;
• a mold disposed on the molding machine and connected to the barrel of the molding machine to receive the molding material, and having a mold cavity with a die swell structure for being filled with the molding material;
• a processing module simulating a filling process of the molding material from the barrel into the molding cavity based on a molding condition including a predetermined screw speed for the molding machine, wherein simulating the filling process of the molding material comprises simulating a die swell effect of the molding material in the die swell structure by taking into consideration of an effective factor, a shear viscosity, an extension viscosity, a shear rate, and a molecular orientation effect of the molding material;
• and
• a controller operably communicating with the processing module to receive the molding conditions and with the molding machine to control the driving motor of the molding machine based on the molding conditions to move the screw at the predetermined screw speed to transfer the molding material at a corresponding flow rate to perform an actual molding process for preparing the molded article;
• wherein the processing module performs a model to simulate the die swell effect of the molding material, and the model is represented by an expression:
• Wi
• ⁡
• (
• γ
• .
• )
• γ
• .
• -
• τ
• *
• ∇
• +
• τ
• =
• 2
• ⁢
• η
• w
• ⁡
• (
• γ
• .
• )
• ⁢
• D
• +
• τ
• A
• =
• η
• W
• ⁡
• (
• γ
• .
• )
• ⁢
• D
• +
• 2
• ⁢
• η
• W
• ⁢
• N
• p
• ⁢
• D
• ⁢
• :
• ⁢
• A
• 4
• where {dot over (γ)} represents a shear rate of the molding material, Wi({dot over (γ)}) represents an viscoelastic property of the molding material, τ represents a stress distribution, τ∇* represents a rate of change of the stress distribution, ηW({dot over (γ)}) represents the weighted viscosity distribution of the molding material, D represents a rate of deformation of the molding material, and τA represents the molecular orientation effect on the stress distribution.