Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133559897
Author: KALPAKJIAN
Publisher: PEARSON
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Textbook Question
Chapter 19, Problem 44QTP
Consider a Styrofoam drinking cup. Measure the volume of the cup and its weight. From this information, estimate the percent increase in volume that the polystyrene beads have undergone.
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Chapter 19 Solutions
Manufacturing Engineering & Technology
Ch. 19 - What are the forms of raw materials for processing...Ch. 19 - What is extrusion? What products are produced by...Ch. 19 - Describe the features of an extruder screw and...Ch. 19 - How are injection-molding machines rated?Ch. 19 - What is (a) a parison, (b) a plastisol, and (c) a...Ch. 19 - How is thin plastic film produced?Ch. 19 - List several common products that can be made by...Ch. 19 - What similarities and differences are there...Ch. 19 - Explain the difference between potting and...Ch. 19 - What is thermoforming?
Ch. 19 - Describe runner, gate, sprue, and well.Ch. 19 - Describe the advantages of cold-forming plastics...Ch. 19 - What are the characteristics of filament-wound...Ch. 19 - Describe the methods that can be used to make...Ch. 19 - What is pultrusion? Pulforming?Ch. 19 - How are very thin plastic film produced?Ch. 19 - What process is used to make foam drinking cups?Ch. 19 - If a polymer is in the form of a thin sheet, is it...Ch. 19 - How are polymer fibers made? Why are they much...Ch. 19 - What are the advantages of coextrusion?Ch. 19 - Explain how latex rubber gloves are made.Ch. 19 - Describe the features of a screw extruder...Ch. 19 - Explain why injection molding is capable of...Ch. 19 - Prob. 24QLPCh. 19 - Explain the reasons that some plastic-forming...Ch. 19 - Describe the problems involved in recycling...Ch. 19 - Can thermosetting plastics be used in injection...Ch. 19 - Inspect some plastic containers, such as those...Ch. 19 - An injection-molded nylon gear is found to contain...Ch. 19 - Explain why operations such as blow molding and...Ch. 19 - Prob. 31QLPCh. 19 - Typical production rates are given in Table 19.2....Ch. 19 - What determines the cycle time for (a) injection...Ch. 19 - Does the pull-in defect (sink marks) shown in Fig....Ch. 19 - What determines the intervals at which the...Ch. 19 - Identify processes that would be suitable for...Ch. 19 - Identify processes that are capable of producing...Ch. 19 - Inspect several electrical components, such as...Ch. 19 - Inspect several similar products that are made of...Ch. 19 - What are the advantages of using whiskers a...Ch. 19 - Construct a table that lists the main...Ch. 19 - Estimate the die-clamping force required for...Ch. 19 - A 2-Iitcr plastic beverage bottle is made by blow...Ch. 19 - Consider a Styrofoam drinking cup. Measure the...Ch. 19 - In Fig. 19.2, what flight angle, , should be used...Ch. 19 - Make a survey of a variety of sports equipment,...Ch. 19 - Explain the design considerations involved in...Ch. 19 - Give examples of several parts suitable for insert...Ch. 19 - Give other examples of design modifications in...Ch. 19 - With specific examples, discuss the design issues...Ch. 19 - Die swell in extrusion is radially uniform for...Ch. 19 - Inspect various plastic components in a typical...Ch. 19 - It is well known that plastic forks, spoons, and...Ch. 19 - Prob. 55SDPCh. 19 - Make a survey of the technical literature, and...Ch. 19 - Prob. 57SDPCh. 19 - Prob. 58SDPCh. 19 - Prob. 59SDPCh. 19 - Examine some common and colorful plastic poker...Ch. 19 - Obtain different styles of toothpaste tubes,...Ch. 19 - By incorporating small amounts of blowing agent,...
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- Explain and discuss the differences on the mechanical properties/behaviours of i) metals, ii) ceramics, iii) polymers and iv) composite materials by drawing figures.arrow_forwardExplain how macroscopic plasticity occurs in polymers from the point of view of microscopic mechanisms (covered in the chapters indicated in the Callister book). (maximum of 3 lines, not counting the space for possible schematic figures).arrow_forwardCompare metals, polymers and ceramics on a chart or Table using the following properties and the ratings, low, high and highest:DensityDuctilityHardnessCorrosion resistanceHardnessThermal conductivityElectrical conductivityWear resistance.arrow_forward
- A paper clip is made of wire 0.7 mm in diameter. If the original material from which thewire is made is a rod 25 mm in diameter, calculate the longitudinal engineering and truestrains that the wire has undergone during processing.arrow_forwardIllustrate the difference between crystalline and amorphous polymers structure and explain the effect of this difference on their properties and applications. Show examples of polymers that are not crystalline or semi-crystalline.arrow_forwardDefine the term perfectly plastic?arrow_forward
- As crystallinity of polymers increases density decreases true or falsearrow_forwardcompare and contrast mechanical properties of lead and plasticarrow_forwardThe graph below gives a plot of force versus total sample length in a tensile test of a polymer. The sample is cylindrical, with an initial diameter of 1 cm and an initial length of 10 cm. From the data below, calculate the modulus, yield stress, yield strain, tensile strength, and % elongation.arrow_forward
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