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Polymer processing aid

Polymer processing aid

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Việt Nam, TP. Hồ Chí Minh
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+84( 
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I. Why use PPA?
In order to compete in today's very demanding environment where high quality and low cost are required, extrusion companies constantly need to optimize their process and materials selection. To access specific information to help solve a specific issue or to identify opportunities for becoming more productive in your specific market
The extrusion of molten polymers is often limited by the occurrence of melt fracture (MF). Although there is more than one phenomenon described by this term, sharkskin is the most common melt fracture type for film grade linear low density and high-density polyethylene (LLDPE and HDPE respectively).
Fluoropolymer based polymer processing additives (PPAs) have been used for many years in LLDPE, HDPE and other polyolefin extrusion processes to eliminate melt fracture.
A.Eliminate Sharkskin
The throughput of several industrially important classes of polymers is limited by a processing defect known as melt fracture or "sharkskin," which is a surface defect on the extruded polymer.
The surface of the polymer becomes rough, resulting in a loss of gloss and a change in certain surface properties. Sharkskin occurs beyond a critical throughput and affects extrusion operations such as film blowing, film casting, extrusion blow molding, tube extrusion, and wire coating. Sharkskin could be reduced or eliminated by the incorporation of a PPA, allowing processors to increase throughput, reduce energy consumption, and enhance processing quality. Fluoropolymer processing additives migrate to the die surface during extrusion where they lower the surface energy, allowing the main polyolefin to slip at the wall.
B.Reduce Die Build-up
Die Build-Up (DBU) is the progressive deposition of components of the extrudate exiting a die during extrusion operations. It occurs with many polymers, on virtually all converting techniques such as blown film extrusion, coating, pipe and profile extrusion
DBU gives rise to surface irregularities affecting aesthetic, optical and mechanical properties of the extrudates. These effects worsen with time to the extent that extrusion has to be stopped for die cleaning, at the expense of production cost-efficiency.
Die build-up is related to die-swell, which provides a medium for transporting pigments, degraded polyolefin, and other materials towards the die surface.
C. Suppress Gel
Gel formation in polyolefin film is a phenomenon that is difficult to predict, reproduce and solve. Gel formation may have one or more compounding factors like humidity, polymer stabilization package, catalyst residues, polymer molecular weight distribution, the presence of oxygen, extruder and die design, and dispersion of inorganic additives to name a few….

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