Page 543 - 04. Subyek Engineering Materials - Manufacturing, Engineering and Technology SI 6th Edition - Serope Kalpakjian, Stephen Schmid (2009)

Qualitative Problems 523

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Materials, Tappi Press, 1997. 1997.
Kazmer, D.O., Injection Mold Design Engineering, Hanser Quinn, ].A., Composites Design Manual, Technomic, 1999.
Gardner, 2008. Rauwendaal, C., Polymer Extrusion, 4th ed., Hanser
Lee, N.C., Blow Molding Design Guide, Hanser Gardner, Gardner, 2001.
1998. Rosato, DM, Plastics Processing Data Handbook, 2nd ed.,
Mazumdar, S.K., Composites Manufacturing: Materials, Rosen, Chapman SC Hall, 1997. Improving Process
Thermoforming:
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P.K. (ed.), Composites Engineering Handbook,
Mallick,
2002.
Materials,
Fiber-reinforced
Composites:
Manufacturing and Design, 3rd ed., Dekker, 2008. Schwartz, M.M., Composite Materials, Vol. 2: Processing,
Fabrication, and Applications, Prentice Hall, 1999.
Micheli, W., Extrusion Dies for Plastics and Rubber: Design Starr, T.F., Pultrusion for Engineers, CRC Press, 2000.
and Engineering Computations, Hanser Gardner, Strong, A.B., Plastics: Materials and Processing, 3rd ed.,
2004. Prentice Hall, 2005.
Mills, N., Mechanical Design of Polymer Foam Products, -, Fundamentals of Composites Manufacturing, 2nd
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Modern Plastics Encyclopedia, McGraw-Hill, annual. Tadmore, Z., and Gogos, C.G., Principles of Polymer
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Molding Handbook, 2nd ed., Hanser Gardner, 2008.
REVIEW QUESTIONS

l9.l. What are the forms of raw materials for processing |9.9. What are the characteristics of filament-wound prod-
plastics into products? ucts? Explain why they are desirable.
|9.2. How are injection-molding machines rated? l9.l0. Describe the methods that can be used to make tubu-
l9.3. What is (a) a parison, (b) a plastisol, and (c) a lar plastic products.
prepreg? |9.l I. What is pultrusion? Pulforming?
l9.4. How is thin plastic film produced? l9.l2. How are plastic sheet and plastic film produced?
l9.5. List several common products that can be made by l9.l3. What process is used to make foam drinking cups?
thermoforming. l9.l4. If a polymer is in the form of a thin sheet, is it a ther-
|9.6. What similarities and differences are there between moplastic or thermoset? Why?
compression molding and closed-die forging?
l9.I5. How are polymer fibers made? Why are they much
l9.7. Explain the difference between potting and stronger than bulk forms of the polymer?
encapsulation.
l9.| 6. What are the advantages of coextrusion?
I9.8. Describe the advantages of cold-forming plastics over
other plastic-processing methods.

QUALITATIVE PROBLEMS

I9.l7. Describe the features of a screw extruder and its l9.22. Can thermosetting plastics be used in injection mold-
functions. ing? Explain.
l9.I8. Explain why injection molding is capable of produc- |9.23. Inspect some plastic containers, such as those con-
ing parts with complex shapes and fine detail. taining talcum powder, and note that the integral lettering on
l9.l9. Describe the advantages of applying the traditional them is raised rather than depressed. Explain.
metal-forming techniques, described in Chapters 13 through l9.24. An injection-molded nylon gear is found to contain
16, to making (a) thermoplastic and (b) thermoset products. small pores. It is recommended that the material be dried be-
l9.20. Explain the reasons that some plastic-forming fore molding it. Explain why drying will solve this problem.
processes are more suitable for certain polymers than for l9.25. Explain why operations such as blow molding and
others. Give examples. film-bag making are performed vertically.
I9.2|. Describe the problems involved in recycling products l9.26. Comment on the principle of operation of the tape-
made from reinforced plastics. laying machine shown in Fig. 19.23b.