How does high crystallinity in a resin affect the way the resin is injection molded, including any post-molding operations that might be done?
What will be an ideal response?
Crystallization normally gives materials a sharper melting point. That is favorable in injection molding because it makes the material easier to heat to a uniform viscosity. Furthermore, the crystallinity usually means that the material will cool and solidify more sharply, thus decreasing the time that the material must be cooled. After the part is removed, residual crystallization is common. This continuing crystallization can distort the part. Therefore, cooling fixtures are often needed to ensure that the part will crystallize and complete cooling without part distortion.
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Complete the field notes from the given data. Check your final answer mathematically, as described in this chapter.
What will be an ideal response?
The deeper the water supply and the heavier the clay content of the soil, the more likely the water will be polluted
Indicate whether the statement is true or false
The Rankine temperature scale is:
A) The absolute temperature scale for Kelvin. B) The absolute temperature scale for Fahrenheit. C) The most common temperature scale used in medicine. D) The absolute temperature scale for Celsius.
Refrigeration can be defined as:
A) Adding cold to an area or substance. B) Chemically accelerating the molecular counterrotation. C) Moving heat from where it is not wanted to where it is unobjectionable. D) Pumping in cold through the use of refrigerant.