Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Textbook Question
Chapter 1, Problem 22RQ
Characterize the process of squeezing toothpaste from a tube (extrusion of toothpaste) using Table 1.4 as a guideline. See the index for help on extrusion.
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Question 3
The diameter of an extruder barrel is 65 mm and its length is 1.75 m. The screw rotates at 55
rev/min. The screw channel depth is 5.0 mm, and its flight (helix) angle is 18°. The head
pressure at the die end of the barrel is 5x10° Pa. The viscosity of the polymer melt is given as
100 Pa-s. Calculate the volume flow rate of polymer in the barrel.
The drag flow is given by the equation:
Qa = 0.5 n² D² N d̟ sinp cosp
The back pressure flow is given by the equation:
Pn D dễ sin²4
Qb
127L
The details of the extruder screw are given in figure 3.1
W.
channel
width
Perpendicular
Pitch
Helix
( p
angle
()
D
Channel depth de
|Axial
|light|
width
Axial
channel
width
Perpendicular
flight
-Direction of mass flow-
Figure 3.1. Schematic illustration of a typical "Archimedean" extruder screw.
width
Root
diameter
diameter
Consider a single screw melt extruder with the following dimensions: D = 6.0 cm, L = 60.0 cm, H
= 0.6 cm, W = 6.0 cm & helix angle of 17.4°. The capacity at open discharge is 10 kg/hour and
the viscosity of the polymer melt is 500 Ns/m?.
a. Determine the pressure when Q = 5 kg/hr.
b. Determine the pressure when a round die of diameter 3.00 cm and length 10.0 cm is
attached to the extruder.
TPC Company produces paint in cans. They have found that in 9 samples of 7 cans each, the average can contains 2.05 liters of paint. The average range found over these samples is 0.24 liters. Find the control limits for X-bar and range charts.
b. XYZ company produces staplers and other items. The production cost per unit is $8 and the cost of setting up the production line for this is $60. The annual holding cost rate is 30%. The company works 250 days per year. The production rate for this product is 120 per day. If the annual demand is 20,000 units,
i. Which batch size should the company use?
ii. What is the minimum monthly cost?
iii. What is the total production time allocated to this product annually?
Chapter 1 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 1 - What role does manufacturing play relative to the...Ch. 1 - Arent all goods really consumer goods, depending...Ch. 1 - The Subway sandwich shop is an example of a job...Ch. 1 - How does a system differ from a process? From a...Ch. 1 - Is a cutting tool the same thing as a machine...Ch. 1 - What are the major classifications of basic...Ch. 1 - Casting is often used to produce a...Ch. 1 - In the lost�wax casting process, what happens to...Ch. 1 - In making a gold medal, what do we mean by a...Ch. 1 - How is a railroad station like a station on an...
Ch. 1 - Because no work is being done on a part when it is...Ch. 1 - What forming processes are used to make a paper...Ch. 1 - What is tooling in a manufacturing system?Ch. 1 - It is acknowledged that chipâ€�type machining is...Ch. 1 - Compare Figures 1.1 and 1.16. What are the...Ch. 1 - In a modern safety razor with three or four blades...Ch. 1 - List three purposes of packaging operations.Ch. 1 - Assembly is defined as the putting together of...Ch. 1 - What are the physical elements in a manufacturing...Ch. 1 - In the production system, who usually figures out...Ch. 1 - In Figure 1.8, what do the lines connecting the...Ch. 1 - Characterize the process of squeezing toothpaste...Ch. 1 - It has been said that low-cost products are more...Ch. 1 - Prob. 24RQCh. 1 - If the rolls for the cold-rolling mill that...Ch. 1 - Make a list of service systems, giving an example...Ch. 1 - What is the fundamental difference between a...Ch. 1 - Prob. 28RQCh. 1 - What kind of process is powder metallurgy: casting...Ch. 1 - In view of Figure 1.2, who really determines the...Ch. 1 - What costs make up manufacturing cost (sometimes...Ch. 1 - What are major phases of a product life cycle?Ch. 1 - How many different manufacturing systems might be...Ch. 1 - In general, as the annual volume for a product...Ch. 1 - The Toyota truck plant in Indiana produces 150,000...Ch. 1 - A company is considering making automobile bumpers...Ch. 1 - Many companies are critically examining the...Ch. 1 - We can analogize your university to a...Ch. 1 - What kind of manufacturing system (design) is your...Ch. 1 - What are the major process steps in the assembly...Ch. 1 - What is the relationship between Figures 1.2Â...Ch. 1 - Recently, National Geographic magazine asked the...
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