Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Textbook Question
Chapter 19, Problem 5RQ
What is (a) a parison, (b) a plastisol, and (c) a prepreg?
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Which of the following are reasons why injection molding of thermosets is more difficult
than injection molding of thermoplastics (two best answers):
O allowances must be made for cross-linking of thermosets
O barrel temperatures must be hotter for thermosets
O cycle times are longer because of curing
thermosets are denser
O two injection units are required
What are 'elastomers'? What are their distinguishing properties?
7) You are working on design improvements for a set of " diameter gears for a
children's toy, and are considering material; they are currently made from
stamped steel. You are now considering plastic gears. List 6 concerns you would
discuss with your polymer/injection molding specialist. List any design.
requirements you assume
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- (b) Which of the following plastic and composite materials processing is most suitable for the application of polymer automotive body panel? Explain how the selected manufacturing process selected can be used to produce the product shown in Figure 1.2 below • Injection Moulding • Reaction injection Moulding (RIM) • Blow Moulding • Rotational Moulding • Thermoforming • Compression Moulding (CM) • Transfer Moulding (TM) • Casting • Foam Moulding SULIT SULIT (BMCG 2323) Figure 1.2 Example of polymer automotive body panelarrow_forwardThermal plastics are stronger than thermoset plastics.arrow_forwardPLEASE SUMMARIZE IT IN YOUR WORDS!arrow_forward
- Define the term perfectly plastic?arrow_forwardWhat is Blow molding process? Describe extrusion blow molding and injection blow molding. What are the advantages of multilayer blow molding?arrow_forwardWhat are the roles of heat, pressure, and moisture in the process used to makecorrugated fiberboard?arrow_forward
- 2. Geometry The top part in Figure 1 is used as the battery cover in a cellphone. How would you modify the design to make it easier to manufacture? Plastic bottle caps [the kind that screw on to a bottle] illustrate one major injection molding hurdle. What is it? How can you get around it? Cellphone back Bottle cap Figure 1 Geometry Problemarrow_forward4ac (simply answer the question) 1.Simply explain the differences between pendant and stiffening groups in polymers. 2. What is glass transition and melting temperature? Simply explain.arrow_forwardDiscuss the significance of the glass-transition temperature, Tg, in engineering applications. Describe the reaction injection molding process and why it's limited to thermosetting polymers.arrow_forward
- Fully describe the VARTM process with carbon fiber reinforced epoxy as the example. Include all tooling requirements, materials and equipment for production and post-processing. Describe advantages and disadvantages of this method and where it would be used in place of another competing process. Sketch & label a cross-section of the process.arrow_forwardWhat are the key considerations when selecting materials for prototyping, particularly in aerospace and medical device industries?arrow_forwardMay I have help with this please?arrow_forward
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