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What causes die drool?
The underlying or root cause of Die Drool is the separation of material components within a compounded production resin. As the material exits the die, the (abrupt) changes in pressure and velocity the resin undergoes can cause a separation of the compound.
How do you control die swell?
Stretching, or drawing down the extrudate are common techniques to compensate solid extrudates for die swell, so that the extrudate can just pass through a sizing die. Although in this technique it is unnecessary for the two to be exactly balanced, it should be noted that drawing down causes molecular orientation.
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What is extrusion drawdown?
In profile extrusion, drawdown is the percentage differential between the dimensions of the die as designed vs. the size of the final part. Without any drawdown to exert tension, the extrudate would drape and sag in the sizing medium.
What are polymer melts?
Polymer melts and solutions are highly viscous liquids, possessing non-Newtonian and viscoelastic natures. The flow behaviors of molten polymers or solutions are becoming increasingly relevant to their engineering processing techniques.
What is die swell how it creates?
Die swell, also known as extrudate swell or Barus effect, is a common phenomenon in polymer processing. Die swell occurs in instances of polymer extrusion, in which a stream of polymeric material is forced through a die, a specialized tool in manufacturing to shape or cut polymeric materials.
What is melt elasticity?
I elastic properties of polymer melts are of equal impor- tance. to the viscous flow properties in the practical processing of polymers. One of the most pronounced manifestations of elastic behavior is the extrudate swell at the exit of an extrusion die (sometimes called “die swell”).
What is the draw down ratio?
ratio of the tip diameter to the product inside diameter is Ratio 2 (R2), then, the ratio of R1 to R2 is the Draw Ratio Balance. Stated another way, the die diameter divided by the product OD, all divided by the tip diameter divided by the product ID is the DRB.
How do you fix a blown film problem?
…
Troubleshooting:
- Reduce winding tension.
- Lessen treatment levels.
- Inadequate film cooling; reduce cooling roll temperature or reduce line speed.
- Inadequate levels of anti-block additive; increase anti-block.
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What is drawdown ratio in blown films?
The amount the film is oriented in the machine direction is controlled by the draw down ratio (DDR), which is simply the ratio of the thickness of the extrudate exiting the die to the final film gauge. For practical purposes, the thickness of the extrudate exiting the die is equivalent to the die gap opening.
What is melt rheology?
With melt rheology defined by stress relaxation over a distribution of time scales (i.e., the relaxation spectrum), an important parameter, called the RSI, is introduced to quantify the breadth of that distribution.
What causes melt fracture?
Melt fracture is defined as the phenomenon caused by excessive shear stress exerted on the molten resin that leads to roughness in the extrudate.
What causes polymerization?
polymerization, any process in which relatively small molecules, called monomers, combine chemically to produce a very large chainlike or network molecule, called a polymer. The monomer molecules may be all alike, or they may represent two, three, or more different compounds.
What is die swell proportional to?
This phenomenon is often referred to as “Barus effect” or “die swell” and is usually described quantitatively in terms of the swelling ratio (d/D), which is the ratio of extrudate diameter to capillary die diameter.
What is die swell in plastic processing?
Die swell has been used as a qualitative measure of polymer melt elasticity for quality control purposes in plastics industry. Die swell also can be used for analysis of extrudate smoothness in an extrusion process. Die swell is expansion of extrudate after exiting the die.
What is the die swell ratio?
[′dī ‚swel ‚rā·shō] (engineering) The ratio of the outer parison diameter (or parison thickness) to the outer diameter of the die (or die gap).
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What is Sharkskin extrusion?
Considering extrusion through a capillary die, at relatively low shear flow rates, the extruded polymer strands can develop a surface with a more or less regular pattern of ridges resulting in an observable mattness or roughness. This phenomenon is often referred to as the ”sharkskin effect.
What is Bambooing in extrusion?
This generates tensile stress and if the stress exceeds Tensile strength, the surface ruptures causing the visual defect – “shark skin”. If the conditions causing shark skin becomes more intensive, eg. Pressure at the extruder becomes excessive or die temperature drops, the extrudate “snaps back” — “Bambooing effect”.
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