EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 9780100793439
Author: KALPAKJIAN
Publisher: YUZU
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Textbook Question
Chapter 19, Problem 61SDP
Obtain different styles of toothpaste tubes, carefully cut them across, and comment on your observations regarding (a) the type of materials used and (b) how the tubes were produced.
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Review Problems
The extrusion die for a polyethylene parison used in blow
molding has a mean diameter of 18.0 mm. The size of the ring
opening in the die is 2.0 mm. The mean diameter of the parison is
observed to swell to a size of 21.5 mm after exiting the die
orifice. If the diameter of the blow molded container is to be 150
mm, determine (a) the corresponding wall thickness of the
container and (b) the wall thickness of the parison.
Discuss Three-Dimensional Printing technology applied on development of artificial tooth.
Discuss the significance of tolerance analysis in the prototyping and manufacturing process. How can software tools assist in optimizing tolerances for a given design?
Chapter 19 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
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 why finishing operations generally are needed for rapid prototyping operations. (c) (i) List the finishing operations you would perform if you are making a prototype of a toy car. (ii)arrow_forwardWhat are the main parameters that influence the flow of a polymer in an extrusion process? Explain this for 3D FDM printing as well as injection moulding and discuss similarities and differences.arrow_forwardExamine the basic principles of prototyping.arrow_forward
- What kind of system is compression molding machine? open, closed, or isolated? Explain.arrow_forwardIn a particular extruder screw the channel depth is 2.4 mm, the screw diameter is 50 mm, the screw speed is 100 rev/min, the flight angle is 17o and the pressure varies linearly over the screw length of 1000 mm from zero at entry to 20 MN/m2 at the die entry. The plastic viscosity was 200 Ns/m2. · Estimate the operating point for the extruder when it is combined with an oval die with dimension of 20x 3 mm.arrow_forward7) 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 assumearrow_forward
- Explain the concept of concurrent engineering in prototyping and its benefits in accelerating product development timelines.arrow_forwardExplain the difference between gas atomized powder and water atomized powder and why they are importantarrow_forwardExplain the concept of a digital twin in prototyping systems and its applications in industries like aerospace and healthcare.arrow_forward
- Drawing on the discussion of the production of polyester textiles. Give a detailed and compelling flowchart of the process, beginning with the raw materials and ending with the finished product, and describe each step of the process individually. It would be helpful if you included illustrations, figures, and animations.arrow_forwardIn powder processing, a cylinder with a diameter of 2 inches and a height of 10 inches is to be made from fine copper powders. A single-action press is used for compaction. If the average density of the green product is 7 g/cm3 at the bottom half of the cylinder, estimate the compaction pressure at the punch surface. Assume no friction between the powders. The coefficient of friction between particles and containers is 0.2.arrow_forward5. What are some of the reasons why plastic shaping processes are important?arrow_forward
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