Screw speed had the greatest effect on extrudate
For profile extrusion with calibration in a water bath, air bubbles on the extrudate
greatly reduce the cooling rate and process output.
As Guill explains, rotating the tooling in relation to the material flow increases the wall strength of the extrudate
, thereby allowing processors to run at lower wall thicknesses, which saves material.
General melt fracture behavior of HDPE resins in a capillary extrusion is well understood, and the physical mechanisms have been discussed in comprehensive reviews [1, 3], At low shear rates, the extrudate
usually is smooth and exhibits no melt fracture.
texture were measured for 10 samples per treatment using a TA.
Other end user benefits of this co-extrusion crosshead are said to include a considerably shorter changeover time (one head is better than two, in this case), less scrap with a single head setup, improved product quality from the increased adhesion between layers, as melt adheres to melt rather than extrudate
, plus the inner layer is not exposed to the environment, allowing contaminates between the layers.
An adjustable cutter with four blades facing the die was operated at 300 rpm to cut the extrudate
as it emerges from the extruder.
Samples may be taken of the extrudate
and tested further, for example by various thermal analysis techniques, tensile testing, microscopy and others, to build a picture of how the act of processing effects the structure and properties of the extrudate
diameter was measured after cooling at room temperature for 30 minutes.
KGaA, Dusseldorf, Germany, has been awarded a patent for a washing and cleaning agent shaped body that is silicone-free and is in the form of a granulate, extrudate
, agglomerate or tablet.
The invention relates to a composition comprising a polymer and wood fiber composite that can be used in the form of a linear extrudate
or thermoplastic pellet to manufacture structural members.
This new feeder can produce higher throughputs, typically up to 50-100 kilos per minute, obviously depending on the product and the profile of the extrudate