Extrusion Line Operation Quiz
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Questions and Answers

What is the key to reducing waste in plants, according to the text?

  • Temperature control in the production area
  • Manual adjustment of screw rpm
  • Increased material production
  • TrueWeighâ„¢ gravimetric extrusion-line control system (correct)

How does the TrueWeighâ„¢ system ensure consistent product output?

  • By decreasing line speeds
  • By increasing raw material feed
  • By adjusting screw rpm and haul-off devices automatically (correct)
  • By introducing more extruder screws

What supports the weigh hopper in the TrueWeighâ„¢ system?

  • Frame adjustments
  • Load cell (correct)
  • Extruder screw
  • Haul-off device

How does the TrueWeighâ„¢ system respond if a screen begins to blind?

<p>It increases extruder screw speed (D)</p> Signup and view all the answers

What does adding a line-speed encoder downstream from the die enable the TrueWeighâ„¢ control to do?

<p>Adjust haul-off speed to maintain correct product thickness (A)</p> Signup and view all the answers

What is the consequence of not reducing the over-gauge percentage in material production according to the text?

<p>High risk of scrapping rolls that don't meet specifications (D)</p> Signup and view all the answers

What is the main advantage of using the TrueWeigh hopper in extrusion control systems?

<p>Reduced need for operator judgment and off-line QC analysis (A)</p> Signup and view all the answers

How does the TrueWeigh hopper contribute to maintaining the correct ratio of component materials in a multilayer structure?

<p>By monitoring loss-in-weight of material as it flows into the extruder (B)</p> Signup and view all the answers

What problem arises from setting thickness setpoints unnecessarily high in extrusion processes?

<p>Increased material waste (C)</p> Signup and view all the answers

Why is it important to maintain the total throughput of the line in co-extrusion applications?

<p>To ensure each component material is present in the correct ratio to the total (C)</p> Signup and view all the answers

What role does the highly accurate load cell play in the extrusion control system?

<p>Constantly measuring the loss-in-weight of material from the hopper (A)</p> Signup and view all the answers

Why is it advantageous for a thin barrier or adhesive layer to be present in the correct ratio within a multilayer structure?

<p>To ensure proper functioning of the finished film or sheet (C)</p> Signup and view all the answers

Why do most extruders give themselves a healthy safety margin when specifying thickness?

<p>To compensate for the possible variability in an extrusion plant. (A)</p> Signup and view all the answers

What is the significance of meeting or exceeding specifications in extrusion processes?

<p>It ensures the production of saleable products. (A)</p> Signup and view all the answers

Why does the text mention that 'in the end, you’ll only be losing money'?

<p>To emphasize the importance of maintaining film thickness within specifications. (D)</p> Signup and view all the answers

What does it indicate if an extruder targets a +10% setpoint for a 4-mil film?

<p>The film will always be at least 4 mils thick. (B)</p> Signup and view all the answers

Why does the text mention that 'there is a lot of resin waste built into your process'?

<p>To underline the importance of minimizing resin waste in extrusion processes. (A)</p> Signup and view all the answers

What does running a gauge that is 'thick enough' imply in the context of extrusion processing?

<p>'Thick enough' means targeting a thickness above the specified value. (C)</p> Signup and view all the answers

What is the purpose of using charts at the beginning of the line?

<p>To set extruder screw speeds and establish total throughput per hour (A)</p> Signup and view all the answers

Why do operators manually adjust extruder and haul-off speeds after analyzing a sample at the QC lab?

<p>To achieve a finished product meeting specifications (D)</p> Signup and view all the answers

What advantage does the TrueWeigh gravimetric control system offer compared to using charts?

<p>It eliminates the need for manual adjustments (D)</p> Signup and view all the answers

Why do most processors build in a large over-gauge allowance into the set-up?

<p>To ensure that weight and ratios are properly adjusted (A)</p> Signup and view all the answers

What instruction does the operator give to the TrueWeigh system when starting a new product that has never run before?

<p>&quot;Start at 5%&quot; (B)</p> Signup and view all the answers

What is done periodically after setting up the initial line to adjust for processing conditions?

<p>Repeat the process to ensure weights and ratios are right (B)</p> Signup and view all the answers

What does the data record in case of screw wear or a blinded screen pack?

<p>Increase in screw speed (C)</p> Signup and view all the answers

What is the purpose of the alarm function included in the system?

<p>Alerting operators about unsafe conditions (D)</p> Signup and view all the answers

How many extruders can the TrueWeigh system coordinate the operation of?

<p>Twelve extruders (C)</p> Signup and view all the answers

What is a significant advantage of using the TrueWeigh system in terms of product quality?

<p>Maintaining product quality as conditions change (B)</p> Signup and view all the answers

Why can material savings justify implementing the TrueWeigh control system?

<p>Reduced downtime during start-up (A)</p> Signup and view all the answers

How does the ability to reduce the safety margin with TrueWeigh benefit processors?

<p>Ensuring layer thicknesses remain within acceptable limits (A)</p> Signup and view all the answers

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