Processing Polymers Quiz
The function of the ejection system is to a. move the polymer melt into the mold cavity. b. open the mold halves after the cavity after cavity is filled. c. remove the molded parts from the runner system after molding d. separate the part from the cavity after molding e. none of the above
d. separate the part from the cavity after molding
The shear viscosity of a polymer melt is affected by which of the following a. Degree of polymerization b. polymer type c. rate of flow d. temperature e. All of preceding
All of the preceding
In rotational molding the centrifugal force is used to force the polymer melt against the surfaces of the mold cavity. True or False
False (its gravity, not centrifugal force)
Which of the three polymer types does not involve crosslinking? a. thermoplastics b. thermosets c. elastomers
Thermoplastics
Use of a parison is associated with which of the following plastic shaping processes. a. bi injection molding b. blow molding c. compression molding
blow molding
Which of the following processes are generally limited to thermoplastic polymers: (a) blow molding (b) compression molding (c) reaction injection molding
blow molding
Of the three polymers types, which is the most important commercially? a. thermoplastics b. thermosets c. elastomers
thermoplastics
Which of the following is not a section of a conventional extruder barrel for a thermoplastics a. compression b. die c. heating
die and heating
2. Which of the three polymer types is not considered to be a plastic?
elastomers
Which properties do plastic parts compare favorably with metals (a) impact resistance (b) resistance to ultraviolet radiation (d) strength
impact resistance
A thermoforming molding mold with convex form is called which of the following a. die b. female mold c. negative mold d. postive mold
positive mold
Spinning in the production of synthetic fibers refers to which of the following: a. extrusion of the plastic melt through small die openings. b. drawing the strands to elongate and thin them. c. both of the above d. none of the above
both of the above