Why can blow molding molds be made out of aluminum, whereas injection molding molds are usually made out of tool steel?
What will be an ideal response?
The pressures associated with blow molding are far less than the pressures in injection molding. Therefore, deformation is less likely. Another reason for the ability to use aluminum in blow molding is that the material does not flow along the mold surface but rather is pressed against the surface. The flow of the plastic along the surface, as occurs in injection molding, is abrasive and wears out the mold. One further reason that aluminum can be used is the lower temperature of the material when it touches the mold. The high temperatures of injection molding resins when they enter the molds cause thermal shrinkage and contribute to abrasive wear.
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Members of a DR team cannot predict when they will receive an emergency call and be required to activate the disaster recovery plan. What precautions can they take to ensure that they can access necessary information and materials?
What will be an ideal response?
The most important aspects of constructing elevated slabs are _____
a. shoring and reshoring b. stripping and resetting forms c. form construction and bracing d. calculating material and labor costs
When coolant is used, it will:
A) Lengthen the life of the tool B) Shorten the life of the tool C) Increase the power requirement D) Do none of the above
What is meant by a "closed" breaker as compared to an "open" breaker?
What will be an ideal response?