l Exam, SPRING 2018 ice questions, each has only ONE correct answer (2 points ea

Question

l Exam, SPRING 2018 ice questions, each has only ONE correct answer (2 points each) JU are multiple choi 1. ion, which of the following processes can reduce the thickness of an extruded part? A. speed up the puller with respect to the speed of the extruder. B. increase the gap between the outlet of the die and the cooling tank to allow additional drawdown D. all of above A. Yes A. Yes C, reduce the sizing rings inside the cooling tank to give a smalle diameter 2. Extrusion is a continuesp Is this statement correct? win screw extruder can NOT increase the mixing of polymer. Is this statement corect? B. No 4. In blown film manufacturing, if all other operation parameters remain the same, how can increasing the melt temperature of the polymer affect the location of the frost line? A. frost line rises farther up the bubble, away from the die B. frost line falls down the bubble, closer to the die C. frost line will not change D. what is frost line? 13.5 2a.? Frost Line 5. All of the following products are commonly injection molded except A Electronic casings B. Dishwashing detergent bottles & Syringes D. Sunglasses pressure of the extruder, which of the following components of the extruding machine needs replacement or maintenance? 6. When operating an extruding machine, you have noticed significant increase of the back A. Thrust bearing B. Extrusion screw C. Screen pack in the head zone D. I have no idea but let's get out of here

Explanation / Answer

1) Option- D.

increasing speed of puller, it obviously reduces the diametar. Similarly allowing additional draw also decreases the thickness of the extruded component.

2) option - B

A material is pushed through a die of the desired cross-section. ... Extrusion may be continuous(theoretically producing indefinitely long material) or semi-continuous (producing many pieces), bt not always it is continous. Some times we extude small componets by back and forth motions of punch.

3) option - B.

twin screw extruder can mix polymer effectively and sent homogeneous discharge. twin screw exruder is meant for better mixing.

4) Option - A

By increasing the melt temperature of the polymer frost line raise above, away from the die.

5) Option - A

We can't cast electronic castings from injection molding. Electronic castings are usually, small in size and requires better control over quality, So injection molding is not a process of choice.

6) Option - C

The screen pack/breaker plate assembly also serves to create back pressure in the barrel. So it has to be properly inspected.

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