Extrudable product

Poly(vinyl alcohol) is employed for a variety of purposes. Film cast from aqueous alcohol solution is an important release agent in the manufacture of reinforced plastics. Incompletely hydrolysed grades have been developed for water-soluble packages for bath salts, bleaches, insecticides and disinfectants. Techniques for making tubular blown film, similar to that used with polyethylene, have been developed for this purpose. Moulded and extruded products which combine oil resistance with toughness and flexibility are produced in the United States but have never become popular in Europe. 

The designer should be aware of the fact that this is to be considered in designing with extruded products. The designer can exercise little control over this pull back condition except to be guided by the experience of the extrusion processor to indicate which materials are particularly susceptible to this problem and what the recommended wall thicknesses are to minimize the effect. In general, one of the best ways to improve the condition is to slow down the rate of extrusion. As a result, products have a tendency to pull back. They also will be more costly to produce. 

For uniform and stable extrusion it is important to check periodically the drive system, the take-up device, and other equipment, and compare it to its original performance. If variations are excessive, all kinds of problems will develop in the extruded product. An elaborate process-control system can help, but it is best to improve stability in all facets of the extrusion line. Some examples of instabilities and problem areas include... 

At least 30wt% percent of all extruded products are thermoformed. They have many advantages over other manufacturing methods. For the mass production of products (packaging, picnic dishes, cups, etc.) sheets and films can be produced in-line with... 

This treatment has the advantage of avoiding the acid extraction of the pectins it could be also used to obtain extruded products which could be used in various preparations traditionnally requiring high methoxyl pectins as gelling agents. The final products could be therefore enriched in dietary fibres and devoid of additives. 

The results showed (16) that the extruded products contained a large amount of water soluble pectins of high molecular weight which were able to gel. It has been shown that the all the extruded citrus fibres were able to gel in presence of sucrose at acidic pH without prior extraction of the pectins. 

Cellulose, oat, and wheat fiber, which are all insoluble, have been incorporated with whey protein into an extruded product (Walsh and Wood, 2010). Increasing the fiber content led to decreases in air cell size. 

The domestic use pattern for lead in 1990 was as follows lead-acid storage batteries, used for motor vehicles, motive power, and emergency back-up power, accounted for 80% of total lead consumption ammunition, bearing metals, brass and bronze, cable covering, extruded products, sheet lead, and solder, represented 12.4% the remaining 7.6% was used for ceramics, type metal, ballast or weights, tubes or containers, oxides, and gasoline additives (USDOC 1992). 

Any method of vulcanising rubber products which proceeds without interruption from start to finish as compared to the method of vulcanising separate batches of products or sections of a product. Continuous vulcanisation processes include the cold curing of proofed cloth, the vulcanisation of belting and flooring, of cables and certain extruded products by either the Liquid Curing Medium, Fluid Bed, Microwave, or Hot Air techniques. 

Factice has a number of uses in rubber compounds where it can stabilise dimensions of products such as hoses and tubing during the early stages of heating of the vulcanisation cycle. It imparts stability to extruded products, a silkiness to calendered products, gives good dimensional stability and overcomes many of the problems of crows feet and blistering. 

Products where this is the sole expansion system are extruded products. This sort of cooking is used for the production of breakfast cereals, savoury snacks and some crisp breads. Of these, only the crisp breads are really within the scope of this book. 

Extrusion cooking is an ideal system for a large company. The equipment is capital intensive while the products can often be made from relatively low cost ingredients. Setting up an extruder is complicated, so extruded products are relatively hard to copy. 

Hose, belting, and cable, 28% 0-rings and seals, 20% latex, 15% molded and extruded products, 15% adhesives and sealants, 10% sponge, 5% footwear, 2% miscellaneous, 5%... 

Special Food Tests. These may be both Model Tests and Utility Tests. Following the application of the tests above, a knowledgeable reasearcher will be able to assess with some certainty which of the food system Model Tests are worthwhile. It has frequently been noticed that regardless of mediocre results in the Model Tests, many researchers will still try to evaluate their products in the more specialized food system Model Tests, in which the tested product will inevitably fail. The tests include meat emulsion system tests, extruded product tests, baking system tests, dairy product tests, and coacervates. 

The product from the fluorination of thiophene over potassium tetrafluorocobaltate(III) varied, not surprisingly, with temperature.108 At 120 C, virtually the sole product was the dihydrothiophene 5, albeit in low yield (14%) this compound is obviously analogous to 2,2.5,5-tetra-fluoro-2,5-dihydrofuran from tetrahydrofuran and potassium tetrafluorocobaltate(IIl). At 350-370 °C, 5 is still a major product, but now seven others are also present, the main ones being 6-8 and the sulfur extruded product perfluorobutane. 

Another PVC siding is an extruded product of an internally ribbed, dual-wall profile. A conventional screw extruder, with a vacuum sizer cooled with water and air, forms a product about 20 cm wide with 160 mm walls and 80 mm ribs on 25 cm centers. The total thickness is about 0.64 cm. The ribs provide rigidity and strength and the dual-wall construction adds thermal insulation. No backing or core is used. 

---