Extrusion processing

Extrusion cooking Extrusion process Extrusion processes Extrusions Extrusion technology Exudate gums Exxate 600... 

Important are behaviors associated and interrelated with plastic materials (thermoplastics, thermosets, elastomers, reinforced plastics, etc.) and fabricating processes (extrusion, injection molding, blow molding, forming, foaming, reaction injection molding, etc.). They are presented so that the technical or non-technical reader can readily understand the interrelationships. 

Table 3.10 shows the recovery from PP of Irgafos 168 and its oxidised and hydrolysed by-products by various extraction procedures. As may be observed, One-Step Microwave-Assisted Extraction (OSM) and US lead both to negligible hydrolytic additive degradation. The measured additive decay (by oxidation) is essentially due to the antioxidant activity during the processing (extrusion) step of the polymer and not to the US or microwave heating treatment. 

Processability Extrusion rate, pilot scale, U.S. Patent 5 683 973 [8]... 

Potente, H., Pundamental Mechanisms in Polymer Processing—Extrusion, SPE ANTEC Tech. Papers, 44, 3604 (1998)... 

Grain - The unidirectional orientation of rubber or filler particles occurring during processing (extrusion, milling, calendering) resulting in anisotropy of a rubber vulcanizate. 

In contrast to most extmsion processes, extrusion coating involves a hot melt, ca 340°C. The thin web cools rapidly between the die and nip even at high linear rates. Both mechanical and chemical bonding to substrates are involved. Mechanical locking of resin around fibers contributes to the resin s adhesion to paper. Some oxidation of the melt takes place in the air gap, thereby providing sites for chemical bonding to aluminum foil. Excessive oxidation causes poor heat-sealing characteristics. 

Single-stage EBM produces a blown product in a single integrated process cycle. BM immediately follows parison extrusion and relies on the melt condition of the parison for the deformation and flow necessary to take up the shape of the mold. There is no reheating of the parison before molding. The principal variants are the continuous extrusion and the intermittent extrusion processes. Extrusion in this distinguishing sense applies to extrusion of the parison rather than the operation of the extruder. 

In contrast to layering processes, extrusion-spheronization can be used to manufacture pellets with sustained-release characteristics without the application... 

Plastic, rubber, and non-iron metal processing (extrusion aid and release additive for plastics and rubber e.g., PUR, thermosets, casting resins, high melting point mold release agents and additives)... 

Manufacturing process Extrusion-cast Solution-cast... 

Extrusion is a cost effective manufacturing process. Extrusion is popularly used in large scale production of food, plastics and composite materials. Most widely used thermoplastics are processed by extrusion method. Many biopolymers and their composite materials with petroleum-based polymers can also be extruded. These include pectin/starch/poly(vinyl alcohol) (Fishman et al. 2004), poly(lactic acid)/sugar beet pulp (Liu et al. 2005c), and starch/poly(hydroxyl ester ether) (Otey et al. 1980), etc. In this study, composite films of pectin, soybean flour protein and an edible synthetic hydrocolloid, poly(ethylene oxide), were extruded using a twin-screw extruder, palletized and then processed into films by compression molding process or blown film extrusion. The films were analyzed for mechanical and structural properties, as well as antimicrobial activity. 

Screening in a pharmaceutical process - extrusion-spheronization Validation of an analytical method - dissolution test... 

Compatibilization during reactive processing, extrusion or injection molding. 

Stanley, D.W. Protein reactions during extrusion processing. Extrusion Cooking C. Mercier, P. Linko, J.M. Harper, Eds. American Association of Cereal Chemists, Inc. St. Paul, MN, 1989 pp. 321-341. 

---