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1) "Foam" -- As to foam extrusion 1foam
Pronunciation: 'fOm
Function: noun
Etymology: Middle English fome, from Old English fAm; akin to Old High German feim foam, Latin spuma foam, pumex pumice
1 : a light frothy mass of fine bubbles formed in or on the surface of a liquid or from a liquid: as a : a frothy mass formed in salivating or sweating b : a stabilized froth produced chemically or mechanically and used especially in fighting oil fires c : a material in a lightweight cellular form resulting from introduction of gas bubbles during manufacture
2 : SEA
3 : something resembling foam
- foam·less /-l&s/ adjective Pronunciation Symbols
Sea foam on the beach Foam on a cappuccino Soap foam bubbles The most general definition of foam is a substance that is formed by trapping many gas bubbles in a liquid or solid. It can also refer to anything that is analogous to such a phenomenon, such as quantum foam. Often people mean polyurethane foam (foam rubber), Styrofoam or some other manufactured foam when they are using the term. It can be considered a type of colloid. From the early 20th century, various types of specially manufactured solid foams came into use. The low density of these foams made them excellent as thermal insulators and flotation devices, and their lightness and compressibility made them ideal as packing materials and stuffings. Some liquid foams, called fire retardant foams, found use in extinguishing fires, especially oil fires. Foam, in this case meaning "bubbly liquid", is also produced as an often unwanted by-product in the manufacture of various substances. For example, foam is a serious problem in the chemical industry, especially for biochemical processes. Many biological substances, for example proteins, easily create foam on agitation and/or aeration. Foam is a problem because it alters the liquid flow and blocks oxygen transfer from air (therefore preventing microbial respiration in fermentation processes). For this reason, anti-foaming agent compounds, like silicone oils, are added to prevent these problems. If foaming is desired, a foaming agent may help. Foaming around the mouth can be a symptom of rabies in animals. The term sea foam is used to describe the foam that forms on top of seawater from the action of waves. In some ways, leavened bread is a foam, as the yeast causes the bread to rise by producing tiny bubbles of gas in the dough. Solid foams form an important class of lightweight cellular engineering materials. These foams can be classified into two types based on their pore structure. The first type of foams are called open cell structured foams. These foams contain pores that are connected to each other and form an interconnected network. The second typ..."
2) "Extrusion" -- As to foam extrusion ex·tru·sion
Pronunciation: ik-'strü-zh&n
Function: noun
Etymology: Medieval Latin extrusion-, extrusio, from Latin extrudere
: the act or process of extruding; also : a form or product produced by this process Pronunciation Symbols
- For the process that creates volcanic rock, see extrusive (geology).
Extrusion is a manufacturing process used to create long objects of a fixed cross-sectional profile. A material, often in the form of a billet, is pushed and/or drawn through a die of the desired profile shape. Hollow sections are usually extruded by placing a pin or piercing mandrel inside of the die, and in some cases positive pressure is applied to the internal cavities through the pin. Extrusion may be continuous (producing indefinitely long material) or semi-continuous (producing many short pieces). Some materials are hot drawn whilst others may be cold drawn. The feedstock may be forced through the die by various methods. A single or twin screw auger, powered by an electric motor, or a ram, driven by hydraulic pressure (for steel alloys and titanium alloys for example), oil pressure (for aluminum), or in other specialized processes such as rollers inside a perforated drum for the production of many simultaneous streams of material. Extrusion simulation tools help to understand the extrusion process and to optimize development of tools and products. Commonly extruded materials include metals, polymers, ceramics, and foodstuffs. - 1 Metal
- 2 Plastic (Injection moulding)
- 3 Ceramic
- 4 Food
- 5 Roadmarking compound
- 6 See also
- 7 External links
| Metal extrusion is used by industry for various purposes such as: - Copper pipe for plumbing
- Aluminium extrusion profiles for tracks, frames, rails, and mullions
- Steel rods or track
- Titanium aircraft components including seat tracks, engine rings, and other structural parts
Steel and titanium extrusions use glass powder as a lubricant. Invented in France in 1935 by Mr. Séjournet, this process was patented throughout the world and helped launch indust..."
Further Data On Term for foam extrusion
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