Insulation Aerogels, high-surface-area porous solids will be employed due to their light weight and low heat conduction to achieve optimal insulation of the Mars surface. Aerogels as a whole are made by creating a gel then extracting the solvent with supercritical fluid extraction. This leaves a very porous, low-density solid. Due to their porous nature, aerogels are considered to be the finest insulation materials available. Silica aerogels are good insulators, but will flake apart and produce dust
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Polymers are additives used widely in pharmaceutical systems for numerous objectives, i.e. as suspending, emulsifying and flocculating agents, adhesives, and for packaging and coating materials. Polymers are made up of repeating monomer units with a high molecular weight. Their chemical reactivity depends on the chemistry of their monomer units, but their properties depend mainly on how the monomers are assembled together. Nearly all polymers exist with a range of molecular weight and for convenience
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laboratory session to mold Polypropylene. Thermoplastic materials such as nylon, polystyrene, polythene and polypropylene can be used in a process called injection molding. How injection molding works? 1. The hopper is filled with granules of plastic powder. The hopper stores the material until it is needed. 2. The heater starts heating up the tube until it reaches a high temperature, then a screw thread starts turning. 3. The granules are pushed along the heater section by a motor, which pushes
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Plastic key chains are being produced in a company named Hot Shot Plastics. The plastic material is first molded and then trimmed to the required shape. The current curetimes (which is the time for plastic to cool) during the molding process affect the edge quality of the key-chains produced. The aim is to achieve statistical control of the curetimes using Xbar and R-charts Curetime data of 25 samples, each of size 4 have been taken when the process is assumed to be in control. These are shown below
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versus plastic. What decision can be made based on the individual break-even points of each process? Metal Drawing Process Plastic Injection Molding Fixed cost $ 50,000 $100,000 Variable cost $ 5 per unit $ 2 per unit Selling price $10 per unit $10 per unit Process Selection Referring to the previous example, Workplace management wants more specific information regarding the volume at which the 3-hole punch should be constructed from metal parts or from plastic parts
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into drains and waterways when it rains, and the most common way would be dropped directly into the water by boaters. Plastics have the most affects on the marine wildlife and the plastic makes up over 60% of marine debris. Plastics are also the longest lasting. A plastic bag will last 200 to 400 years, where a plastic bottle takes about 450 years to fully break down. These plastics are not only outliving the marine wildlife but it is also killing them. In August of 2000 there was a whale found washed
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Unit 142: Plastic Processing Assignment 1: Moulding techniques used for the manufacture of plastic products P1 & P2 Plastic Dustbins The moulding technique used to make plastic dustbins is referred to as injection moulding. Injection moulding is the process where plastic is injected into a mould to form the final product. Both thermoplastics and thermosetting plastic can be used for the process of injection moulding. For this type of product HDPE is used, which
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Molds usually present the following similar basic components6 (Figure 10): 1. Mounting plate: Typically a heavy steel plate attached to the bottom of the mold frame that enables the mold to be attached to the machine; 2. Frame: Supports the mold cavity. It needs to be strong enough to support the mold, resist the torque applied for closure, and withstand repeated heating and cooling cycles. The frame, which can also be used as the attachment point for mounting plates, clamping, pry points and other
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BISMUTH Have you ever taken Pepto Bismol? If you answered yes, you have ingested Bismuth. Bismuth is used in many things due to how versatile the element is. It ranges from medicines to helping deal with radioactive waste. It is found in so many common everyday things, and we just do not know it. If bismuth was not around, many of our house hold items would be different. Without bismuth, many of our everyday things will be different. Bismuth has been known since the fifteenth century, but it was
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Aluminum fencing is one of the most popular choices for homeowner and commercial property owners who want durable fencing at a reasonable price. It has the elegant look of wrought iron without the required maintenance. Aluminum fences have become a popular choice to enhance the appeal of your property while staying within your allotted budget. Aluminum fencing is an excellent option for those who like the look of wrought iron but do not want the upkeep and maintenance. With aluminum, you do not
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