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Influence of Orientation on the Performance of Plastic Mold during Production

Today is the legend of 520 festivals, as a mold of us, who you today say to you 520 or who you said 520? Dongguan mold mold factory as a mold, if you want to say to the mold 520, I believe we are very difficult to say it. Today, the editor with everyone to understand the plastic mold production process on the impact of plastic parts performance.


Effect of orientation on mechanical properties of plastic parts


For uniaxial orientation, the tensile strength in the direction parallel to the orientation is greatly enhanced, while the tensile strength in the direction perpendicular to the orientation axis is weakened; and the biaxially oriented sheet or film is in any direction of the plane Have a higher tensile strength, elongation at break and impact toughness, tear resistance has also increased.


 orientation to make plastic parts with anisotropy (in light, heat, electricity, etc.)


The impact of orientation on other performance


The glass transition temperature of the polymer increases with the degree of orientation; the greater the degree of orientation, the greater the retraction or heat shrinkage.


In summary, the orientation of the polymer has a great influence on the properties of the plastic parts. In the plastic molding production, the use of polymer orientation can be used to improve the performance of plastic parts, such as blown film is the use of polymer biaxial orientation principle to improve its performance, but not to say that the polymer orientation of plastic parts are Benefits, in the production of larger plastic parts, it should try to eliminate the orientation phenomenon, so that plastic parts will not occur warping deformation or cracks, so as to ensure the quality of plastic parts.

When the polymer melt flows from the gate into the mold cavity, the melt is in the initial stage of the filling, and the stream is radially shaped, so that a planar orientation structure is formed. Melt and the cavity wall contact, began to achieve filling process, in this process, first with the cavity wall contact melt quickly cooled to form a less than the orientation of the shell, the melt will be in the shell flow. Due to the friction of the shell on the melt, the melt flow resistance in the vicinity of the melt, the melt will produce a lot of shear stress, so macromolecules can be highly oriented here. At the same time, the friction in the middle of the smallest friction, shear stress is not too large, so macromolecules generally only mild orientation. And in the transition zone between the middle melt and the melt near the shell, the macromolecule orientation is moderate.



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