Standard |
MCA 232 – Plastics Theory
Emphasizes selection of materials, equipment, tooling, and design requirements for the manufacturing processes of plastics. Topics include: chemical makeup and properties of plastics, molding processes, construction theory of molds, machinability and application of plastics, thermosetting plastics, and thermoplastic plastics.
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Competency
Areas |
Hours |
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Chemical Makeup and Properties of Plastics |
Class |
5 | |
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Molding Processes |
D. Lab |
0 | |
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Construction Theory of Molds |
P. Lab/O.B.I. |
0 | |
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Machinability and Application of Plastics |
Credit |
5 | |
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Thermosetting Plastics |
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Thermoplastics Plastics |
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Prerequisite: |
Program admission | ||
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Corequisite: |
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Course Guide |
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Competency |
After completing this
section, the student will: |
Hours | ||
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Class |
D.Lab |
P.Lab/
O.B.I. | ||
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CHEMICAL MAKEUP AND
PROPERTIES OF PLASTICS |
10 |
0 |
0 | |
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Plastic structure |
Explain the basic elements present in all plastics. |
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Explain ionic and covalent bonds and which bond is present in plastic molecules. |
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Discuss molecular architecture of plastics. |
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Molecular control |
Describe pendant groups, linear and non-linear monopolymers and how branching can be controlled to give specific shapes (star, " + ", or comb) to molecules. |
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Explain condensation polymerization and addition polymerization. |
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MOLDING PROCESSES |
10 |
0 |
0 | |
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Types of molding processes |
Explain each molding process; why it is used; the types of plastics that can be molded and the types of products produced by each process. |
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CONSTRUCTION THEORY OF MOLDS |
10 |
0 |
0 | |
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Properties |
Describe the thermo properties of mold materials. |
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Mold components |
Explain risers, cooling of metals in a mold and how cooling rates or direction of cooling can be controlled. |
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Define pattern allowances and how they are built into a mold or pattern. |
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Explain how shell molds are made. |
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Explain the purpose of cores, the materials and methods to form cores. |
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Describe the molds used in die casting, slush casting, centrifugal, high-low pressure and gravity permanent mold casting. |
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Types of molds |
Describe lost wax molds, plaster mold casting, unbonded sand and vacuum molding, and molding with disposable patterns. |
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Raw materials |
List the raw materials for the type of thermosetting plastic produced. |
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Explain how resins (liquid or dry) and hardners work. |
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Describe the affect heat, pressure or both heat and pressure has on thermosetting plastics. |
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MACHINABILITY AND APPLICATIONS OF PLASTICS |
9 |
0 |
0 | |
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Types and advantages |
Identify types of plastics that are machinable, used in production and have replaced metal parts. |
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List the advantages of plastic over metal and note any disadvantages. |
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Applications |
Describe the uses for the common plastics and identify the physical properties that make the particular plastic desirable for that use. |
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THERMOSETTING PLASTICS |
9 |
0 |
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Properties |
Describe the physical properties, chemical bonding and methods of producing thermosetting plastics. |
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Discuss the problems and limitations of molding thermosetting polymers. |
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Applications |
Describe crosslinking and how it affects the molecular size of thermosetting polymers. |
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List the common applications of thermosetting plastics, their physical properties, advantages over thermoplastics and limitations. |
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THERMOPLASTIC PLASTICS |
2 |
0 |
0 | |
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Properties |
Describe the physical properties, chemical bonding and methods of producing thermoplastic plastics. |
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Suggested Resources |
Allyn, E. (1987). Mold design I: For plastic injection.
Woodstock, NY: Allyn Air Advertising and Publicity.
Bhattacharya. (1987). Metal-filled polymers: Properties and
applications. New York: Dekker.
Birley, A. W., et al. (1988). Plastics materials: Properties and
applications. New York: Routledge Chapman & Hall.
Brown, R. L. (1980). Design and manufacture of plastic parts.
New York: John Wiley & Sons.
Calvert, E. (1980). Injection moulding. Trans-Atl
Phila.
Chkeremisinoff. (1989). Handbook of polymer science and technology,
vol. 2: Performance properties of plastics and elastomers. New York:
Dekker.
DuBois, J. H., & Pribble, W. I. (1987).
Plastics mold design engineering
handbook. New York: Van Nostrand Reinhold.
Dym, J. B. (1987). Injection molds and molding. New York:
Van Nostrand Reinhold.
Epstein, G., & Schwartz, S. (1985). Mold design and moldmaking for plastics
products. New York: T-C Pubns CA.
Foams: Molding thermosetting and
thermoplastic structural foam. (1983). New York: T-C Pubns
CA.
Gastrow, H., & Stoeckhert, K. (1983). Injection molds: One hundred two
designs. New York: Oxford University Press.
Glanvill, A. B., & Denton, E. N. (1965).
Injection-mould design fundamentals.
New York: Industrial Press.
Injection molding-plastics. (1983). New York: T-C Pubns
CA.
Injection molding, extrusion, mold making and
design, machinery and equipment, color and decorating, and management. (1981).
Proceedings of SPE Pactec '81, August
25-27, 1981, Los Angeles, California. New York: T-C Pubns
CA.
Injection molding machinery and accessories,
1976-January 1985. (1984).
New York: T-C Pubns CA.
Injection molding of
plastics. (1984). New York:
T-C Pubns CA.
Isayev. (1987). Injection and compression molding
fundamentals. New York: Dekker.
Johannaber, F. (1983). Injection molding machines: A user's
guide. New York: Oxford University Press.
Machining processes and properties of
plastics and elastomers, 1973-April 1985. (1985). New York: T-C Pubns
CA.
Menges, G., & Mohren, P. (1986). How to make injection moulds. New York:
Oxford University Press.
Mold release agents for rubbers and plastics,
1973-1986. (1984). New York:
T-C Pubns CA.
Nyborg, R. L. (1989). Plastic injection molding made easy.
Provo, UT: Regal Pubns.
Reaction injection molding of
polymers. (1984). New York:
T-C Pubns CA.
Robinson, J. S. (1981). Plastics molding: Equipment, processes, and
materials. Lake Mary, FL: Polymers and Plastics Tech Publishing
House.
Rosato, D. V., & Rosato, D. V. (1988). Blow molding handbook. New York:
Macmillan.
Rosato, D. V., & Rosato, D. V. (1985). Injection molding handbook. New York:
Van Nostrand Reinhold.
Schwartz, S., & Goodman, S. (1982). Plastics materials and processes. New
York: Van Nostrand Reinhold.
Society of Plastics Engineers Staff. (1985).
Tooling challenges for the 80's: Injection molding tooling: Design, materials,
methods. Regional Technical Conference,
the Erie Hilton Hotel, Erie, Pennsylvania, April 2-3, 1985. New York: Bks
Demand UMI.
Sors, L., & Balazs, I. (1989). Design of plastic moulds and dies. New
York: Elsevier.
Sors, L. (1981). Plastics molds and dies. New York: Van
Nostrand Reinhold.
Stoeckhert, K. (1983). Mold-making handbook: For the plastics
engineer. New York: Oxford University Press.
Tobin, W. J. (1985). Quality control manual for injection
molding. New York: T-C Pubns CA.