Results 241 to 250 of about 162,516 (289)

Thermoplastic Extrusion of Bulk Metallic Glass

Scripta Materialia, 2009
Extrusion of Zr 44 Ti 11 Cu 10 Ni 10 Be 25 bulk metallic glass in its supercooled liquid state is explored as a method to create objects of a fixed cross-sectional profile. The effect of processing parameters and extrusion geometries on the extrusion length is determined. The results reveal the nature of the flow process as creeping flow.
Golden Kumar, Jan Schroers
exaly   +2 more sources

Designing Extrusion Dies for Thermoplastics

Journal of Elastomers & Plastics, 1991
An extrusion die must be able to produce, at the highest possible flow rate, a specific cross-section of an homogeneous melt that, after cooling, is well within the dimensional tolerances defined. The correct design of such a tool will have to consider the relevant physical and rheological phenomena that take place during the flow of the polymer melt ...
J.A. Covas, O.S. Carneiro, A.M. Brito
openaire   +1 more source

Mixing in processing of thermoplastics by extrusion

Chemical and Petroleum Engineering, 1993
Extruders in which the working component is a screw with continuously decreasing channel depth (Fig. la) are the most widely used. In such a screw, the mixing process begins after loading zone I in melting zone II and ends in feeding zone III. However, mixing in the melting zone occurs only in the melt region and does not affect the solid core, which ...
V. S. -Kh. Kim, V. A. Samoilov, E. M. Sherysheva, Chen Yun   +3 more
openaire   +1 more source

Screw extrusion of thermoplastics: I. General model of the screw extrusion

Russian Journal of Applied Chemistry, 2012
New approach to a simulation of single and twin screw extruders for thermoplastics processing was suggested. The approach takes into account real boundary geometric conditions and conditions on velocity (a screw is rotated, cylinder is fixed), and also that there exist phase transformations of the processed material and its heat exchange with surfaces ...
I. O. Mikulionok, L. B. Radchenko
openaire   +1 more source

Foam Extrusion of Thermoplastic Elastomeric Alloys

Cellular Polymers, 1988
The new elastomeric alloys such as Monsanto's Santoprene thermoplastic rubber (A class of TPE) can be formed during extrusion by the use of a chemical blowing agent or by the use of a fluorocarbon blowing agent to provide products with characteristics superior to foamed vulcanised rubber. These materials offer more precise dimensional design tolerances,
D.E. Peterson, P.D. Agrawal
openaire   +1 more source

Study of Thermoplastic PLA Foam Extrusion

Journal of Cellular Plastics, 2008
Various PLA resins have been tried with chemical blowing agent and physical blowing agent in extrusion process to study the expansion dependency of amount of blowing agent and cell density, respectively. It has been found that a `dip' exists in both cases; foam density decreases to a minimum, then increases.
S.T. Lee, Leonard Kareko, Jenny Jun
openaire   +1 more source

Extrusion of Cellular Thermoplastics

1982
Extrudates made from cellular plastics may be produced by using both chemical and physical expansion systems. Both free expansion and controlled expansion techniques are employed to produce pipe, cable, profile, etc. The relevance of each system when based on a particular polymer-product combination is discussed and where appropriate, formulations ...
openaire   +1 more source

Extrusion coating of plywood with thermoplastics

Plastics, Rubber and Composites Processing and Applications, 1998
In the present work plywood has been coated with polypropylene rather than the traditional coating material, thermoset. A modified extrusion coating process was applied with the aim of achieving adequate adhesion between the plywood and the thermoplastic.
Tervala, Outi, Lampinen, Johanna, Järvelä, Pentti, Järvelä, Pirkko   +3 more
openaire   +3 more sources

Nucleation in Thermoplastic Foam Extrusion

Cellular and Microcellular Materials, 1994
Abstract Continuous foam nucleation experiments were performed on a twin screw extruder capable of making foam sheet. Nucleation results are compared to the Lump Cavity Model which was proposed to describe nucleation in thermoplastic foam extrusion.
openaire   +1 more source

Thermoplastic Extrusion for Ceramic Bodies

2009
Originally for the extrusion of ceramic bricks and tiles, clay and water were used to endow ceramic particle mixtures with sufficient plastic behavior to permit practical shaping of the ceramic bodies. High performance ceramics, however, often require the elimination of clay from extrusion formulations because the chemistry of the clay is incompatible ...
openaire   +2 more sources