Podcast
Questions and Answers
What type of extruded product is produced using a die configuration for shaping hollow sections?
What type of extruded product is produced using a die configuration for shaping hollow sections?
- Sheet and film
- Tubes and pipes (correct)
- Solid profiles
- Wire and cable coating
What is the cause of 'melt fracture' in extrusion, as described in the text?
What is the cause of 'melt fracture' in extrusion, as described in the text?
- Friction with the die
- Die swell
- Turbulent flow through the die entrance (correct)
- Sharkskin
What type of extruded product is produced using a slit-die in the extrusion process?
What type of extruded product is produced using a slit-die in the extrusion process?
- Wire and cable coating
- Sheet and film (correct)
- Tubes and pipes
- Filaments
What is the purpose of a chill-roll in extrusion for sheet and film production?
What is the purpose of a chill-roll in extrusion for sheet and film production?
What are the characteristic properties of a foamed polymer mentioned in the text?
What are the characteristic properties of a foamed polymer mentioned in the text?
Which type of polymer foam has a matrix polymer that is a rubber?
Which type of polymer foam has a matrix polymer that is a rubber?
What are some common gases used in polymer foams?
What are some common gases used in polymer foams?
How is mixing a physical blowing agent with the polymer different from mixing a liquid resin with air?
How is mixing a physical blowing agent with the polymer different from mixing a liquid resin with air?
What is the function of die swell in polymer melts?
What is the function of die swell in polymer melts?
Which process involves the shape of the die orifice determining the cross-sectional shape of the extrudate?
Which process involves the shape of the die orifice determining the cross-sectional shape of the extrudate?
In extrusion, what does the typical pressure gradient in an extruder represent?
In extrusion, what does the typical pressure gradient in an extruder represent?
What is the primary function of an extruder screw inside the barrel?
What is the primary function of an extruder screw inside the barrel?
At what shear rate is viscosity typically evaluated for selected polymers?
At what shear rate is viscosity typically evaluated for selected polymers?
Which shaping process is associated with blow molding and rotational molding?
Which shaping process is associated with blow molding and rotational molding?
Which process involves inflating a soft polymer to conform to a blow mold?
Which process involves inflating a soft polymer to conform to a blow mold?
In thermoforming, what happens to the plastic sheet placed over a concave mold cavity?
In thermoforming, what happens to the plastic sheet placed over a concave mold cavity?
Which type of injection molding machine uses a plunger type alternative to the reciprocating screw?
Which type of injection molding machine uses a plunger type alternative to the reciprocating screw?
What is the purpose of the blow pin in blow molding?
What is the purpose of the blow pin in blow molding?
Which coating category involves coating an entire object by dipping or spraying?
Which coating category involves coating an entire object by dipping or spraying?
What is the main difference between vacuum thermoforming and pressure thermoforming?
What is the main difference between vacuum thermoforming and pressure thermoforming?
Which injection molding process involves injecting a preform molded around a blowing rod?
Which injection molding process involves injecting a preform molded around a blowing rod?
What does compression transfer molding entail?
What does compression transfer molding entail?
Which material gives a porous or cellular structure to the polymer foam?
Which material gives a porous or cellular structure to the polymer foam?
