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# Plastics Engineering

Plastics engineering is the process, design, development and manufacture of plastics products. A plastic is a polymeric material that is in a semi-liquid state, having the property of plasticity and exhibiting flow. Plastic machinery is the general term for all types of machinery and devices used in the plastics processing industry. The nature of plastic materials pose unique challenged to engineers. The mechanical properties of plastics are difficult to quantify and the plastic engineers have to design a product that meets certain specifications while keeping costs to a minimum.

The economics of the products that are worked with play an important role in plastics engineering. The cost of plastic materials range from the cheapest plastics used in mass-produced consumer product to the expensive specialty plastics. Some plastics are manufactured from re-cycled materials. However, the uses of these products in engineering applications are limited due to the consistency of formulation and their physical properties tendency to be less consistent.

Plastic engineers are trying to reduce the ecological footprint of their products. The most common practice for this is the Vinyloop process. This process guarantees that a productâ€™s primary energy demand is 46 percent lower than conventional produced PVC. The global warming potential of this method is 39 percent lower than conventional methods.

### Methods for the elastic and plastic evaluation of steel structures

Hi, I have to provide the different methods of elastic and plastic evaluation of steel structures. I must talk about the differences between the methods based on the cross section capacity including the cost effectiveness of the different methods. Any information and help provided would be much appreciated.

### Separation Processes

Could someone please provide a technical description of the following separation processes and list the type of industries that typically employ them. A. Scrubbing B. Solvent Extraction C. Sorting.

### Elastic Plastic Rotating Shaft

Shafts A and B in Fig. P11.20 are solid circular cylinders. Shaft A is linear elastic, perfectly plastic with G = 20 x 10^6 psi and k = 50,000 psi. Shaft B is also linear elastic, perfectly plastic with G = 25 x 10^6 and k = 40,000 psi. a. What is the very largest torque T that can be applied with elastic behavior everywhere?

### Cantilever with Elastic and Plastic Behaviour

In Fig. P10.29 is shown a cantilever beam, subjected to axial and lateral loads and made from a material that has an elastic, perfectly plastic constitutive law with Y = 60,000 psi. See attachment for diagram. a. What is the largest value of qo for elastic action throughout? b. What is the largest value of qo, allowing for pla

### Atomistic level processes

Comprehensive explanation required as to the atomistic level processes which lead to 1. strengthening of metals by cold working or strain hardening 2. regaining of ductility of strain hardened structures by recovery, recrystallisation and grain growth

### Introduction to Manufaturing Process - Question 5

5) List at least three processes by which a plastic sheet of 2-m width and 0.2-mm thickness can be made. (ISBN 0-07-116911-3) (chapter 14)