Effect of extrusion conditions on rigid PVC foam

Rabinovitch, Elvira B.; Isner, James D.; Sidor, James A.; Wiedl, Daniel J.

doi:10.1002/vnl.10193

Cited by 25 publications

(25 citation statements)

References 12 publications

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“…The density variation was insignificant (within 2.5%) up to 1.7 phr CBA content with the DDR increased from 1.0 to 1.3, whereas it was up to 4.5% to 13% above 2.5 phr CBA content. Past studies showed that the density was nearly independent of the DDR for PVC 16 and the rice-hull-filled PE 22 foamed profiles at a no or low gas content, which agrees with this finding. The density reduction with increased DDR could be possibly due to the formation of more voids from volatiles and water contained in WF at high-temperature extrusion.…”

Section: Resultssupporting

confidence: 90%

Effect of extrusion conditions on the surface quality, mechanical properties, and morphology of cellular wood flour/high-density polyethylene composite profiles

Adhikary

Islam

Rizvi

et al. 2012

Journal of Thermoplastic Composite Materials

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Wood-plastic composite (WPC) can be fine-cell processed to create a new class of low-weight composite material with improved mechanical properties that could broaden their applications. This study investigated the effects of a chemical blowing agent (CBA) and the drawdown ratio (DDR) on the surface quality, cell morphology, and mechanical properties of extruded foamed WPC profiles. The rectangular foamed WPC profiles were produced from high-density polyethylene and wood flour with different CBA contents and DDR values using a twin-screw extrusion line. The foam density, cell density, and their sizes and shapes were largely depended on the CBA content and the DDR. A foamed WPC profile with a 22% density reduction with cellular structure can be produced using an extrusion profile line.

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Section: Resultssupporting

confidence: 90%

Effect of extrusion conditions on the surface quality, mechanical properties, and morphology of cellular wood flour/high-density polyethylene composite profiles

Adhikary

Islam

Rizvi

et al. 2012

Journal of Thermoplastic Composite Materials

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“…As seen in Table 5, higher screw speed gave the foam lower void fraction, smaller average cell size and higher cell density. This conclusion was also reported by references [19,[39][40]. The cell density reached 2.2 3 10 6 cells/cm 3 at 100 rpm.…”

Section: Effect Of Screw Speed On the Cell Morphologysupporting

confidence: 86%

Effects of formulation and processing parameters on the morphology of extruded polypropylene‐(waste ground rubber tire powder) foams

Xin¹,

Zhang²,

Pal³

et al. 2009

Vinyl Additive Technology

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This paper presents an experimental study of the foaming behavior of polypropylene (PP)/(waste ground rubber tire powder) (WGRT) blends when using a chemical blowing agent in an extrusion foaming process. The effects of formulations (i.e., WGRT content, blowing agent content, compatibilizer) and the processing parameters (i.e., die temperature, screw speed) on the void fraction, average cell size, cell density, and cell morphology of the PP/WGRT foams were investigated. The blowing agent loading affected the cell structure of the foams and the average cell size, and the void fraction increased with increasing blowing agent loading. Both increasing the screw speed and decreasing the die temperature could establish a high pressure drop in the extruder die, and these were beneficial to the foaming extrusion. J. VINYL ADDIT. TECH-NOL., 15:266-274, 2009. ª

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“…One of the most important variables in the foam extrusion is the temperature, which has a strong effect on fusion and melt rheology [2].…”

Section: Processing Of Pvcmentioning

confidence: 99%

“…Rigid PVC foams are obtained mainly by conventional foaming with chemical foaming agents (CFAs) [2]. The disadvantages of the conventional plastic foams are their large cell size and the lack of uniformity of those cells.…”

Section: Introductionmentioning

confidence: 99%

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Continuous extrusion production of microcellular rigid PVC

Díaz

Matuana

2009

Vinyl Additive Technology

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This study examined the effect of Poly[vinyl chloride] (PVC) formulation on the cell morphology and density of rigid PVC foamed with supercritical CO 2 in a continuous extrusion process. Cell morphology and the density of foamed samples were controlled by blending two acrylic-based processing aids (all-acrylic foam modifier K-400 and acrylic-based impact modifier KM-334), using a mixture design. The effect of blend ratios on the fusion and die swell behaviors of PVC was investigated by means of a torque rheometer and on a single-screw extrusion capillary rheometer, respectively. Fusion was promoted as the relative amount of the all-acrylic foam modifier increased in the blends. Similarly, the elastic constant of PVC, derived from the linear relationship between the die swell and apparent shear stress, increased upon increasing the relative amount of the all-acrylic foam modifier in the blends, thus suggesting an increase in the melt elasticity of PVC. Microcellular rigid PVC foams with densities of approximately 0.15 g/cm 3

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Effect of extrusion conditions on rigid PVC foam

Cited by 25 publications

References 12 publications

Effect of extrusion conditions on the surface quality, mechanical properties, and morphology of cellular wood flour/high-density polyethylene composite profiles

Effect of extrusion conditions on the surface quality, mechanical properties, and morphology of cellular wood flour/high-density polyethylene composite profiles

Effects of formulation and processing parameters on the morphology of extruded polypropylene‐(waste ground rubber tire powder) foams

Continuous extrusion production of microcellular rigid PVC

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