StudentShare
Contact Us
Sign In / Sign Up for FREE
Search
Go to advanced search...
Free

The Manufacturing Process for Plastic Bags, Pipelines, and the Propeller for an Outboard Maritime Motor - Essay Example

Cite this document
Summary
The author of the paper gives detailed information about the manufacturing process for plastic bags, the propeller for an outboard maritime motor which is basically the thing that connects the boat with the water, and about the manufacturing process for a pipeline.   …
Download full paper File format: .doc, available for editing
GRAB THE BEST PAPER96.8% of users find it useful
The Manufacturing Process for Plastic Bags, Pipelines, and the Propeller for an Outboard Maritime Motor
Read Text Preview

Extract of sample "The Manufacturing Process for Plastic Bags, Pipelines, and the Propeller for an Outboard Maritime Motor"

Manufacturing Technology Primary manufacturing is when we make products which can be used as raw material for other products. This is when raw material is changed into semi finished products. Primary manufacturing has three processes: obtaining the material, refining the material, and creating industrial materials. (Teaching with Historic Places Lesson Plan, n.d) The manufacturing process for plastic bags used at supermarkets use he material plastic, sometimes they can use PET / PET / PE and laminated of PA, PET, BOPP, AL, VMPET, VMCPP, PE, CPP. This depends on the type of plastic bag that is being produced. Different bags need different type of material and all these bags can carry different types of products for example: bags made from laminated of PA, PET, BOPP, AL, VMPET, VMCPP, PE, CPP can carry meat and seafood while the bags produced from plastic are normal shopping bags used for promotional items etc. A plastic bag produced with synthetic thermoplastic material has two strips attached to it which are uniformly spaced with relevance to the median longitudinal axis of the sheet of plastic. In the finished bag these extend over the whole height and are arranged in such a way that the width of the space between the lateral folds which are produced after folding the flat band about the median longitudinal axis and then the longitudinally extending weld seam closes the hose thus formed. The sheet is then bent about the longitudinal median axis to form a hose longitudinally open at one side so that the reinforcing strips are opposite one another. Lateral folds are formed in the hose to form two collapsible sidewalls and two reinforced sidewalls, and a longitudinal weld seam is made to longitudinally close the hose. Furthermore, a bottom weld seam transverse to the longitudinal weld seam is made and the so formed bag is separated from the strip and a grip aperture is formed in the upper portion of the bag. The sheet is then bent about the longitudinal median axis to form a hose longitudinally open at one side so that the reinforcing strips are opposite one another. Lateral folds are formed in the hose to form two collapsible sidewalls and two reinforced sidewalls, and a longitudinal weld seam is made to longitudinally close the hose. It is also possible to have the upper portion contoured simultaneously with the forming of the grip aperture. (Method Of Manufacturing Plastic Carrier Bags, n.d) The propeller for an outboard maritime motor is basically the thing that connects the boat with the water. The propeller is the thing that gives you the performance, if the propeller is bad then the boat will perform poorly and if the propeller is in good condition then the boat will perform well. The size of the propeller has two features or dimensions to it: the diameter and the pitch. The diameter of a two-blade propeller is the measurement, in inches, from the outer tip of one blade to the outer tip of the other. The pitch is the measurement in inches of how far forward the prop would "screw" itself if it was rotated in a solid material. (Wawrzyniak, n.d) A boat propeller has some features: a hub which has a front, back and an axis of rotation, this come between the front and the back. A number of blades extend from the hub between the front and the back and each of these blades has a surface adjacent to the hub in a slanted angle to the axis of rotation. The blade tip has an adjacent surface which forms a dihedral angle with the surface that is adjacent to the hub. The surface adjacent to the blade tip is inclined at a greater angle to the hub than the surface adjacent to the hub. Moreover, each and every blade has a trailing edge which extends in a semi circle from the hub and each trailing edge is substantially straight or at a 90 degree angle and an arcuate leading edge extends between a respective blade tip and hub. Each of the leading and trailing edges extend to and abut the hub. On each blade tip there is a flange which is provided and disposed on each blade tip. It extends parallel to the hub axis toward the hub back. The flange can be disposed at more or less a 90 angle with the surface bordering the blade tip and the flange may include an arcuate edge which extends in between the leading and trailing edges. The flange is on the forward camber only. If possible, the blades are given some space in between and around the hub without overlapping. A total of five blades may be provided. Furthermore, the propeller may include a pointed spinner having an aerodynamic connection with the hub front for enabling streamline flow of water there past. There are core holes in the hub which are disposed around the axis; these may provid for preventing shrinkage of the propeller during manufacture, particularly when the material manufacture includes urethane or other chemicals like it. These core holes are only needed when the hub diameter may make the mass off material to be greater which may result in shrinkage during the manufacturing process. In addition, an efficiency of the propeller in accordance with the present invention is enhanced when the leading edge, trailing edge, and the flange arcuate edge comprise featheredges. (Method Of Manufacturing Plastic Carrier Bags, n.d) Sulphuric acid is a clear, colorless, odorless, viscous liquid that is very corrosive. It is often used to monitor a country's degree of industrialization. Sulphuric acid is largely used in agricultural fertilizers. The manufacturing process for a pipeline to carry this corrosive chemical needs to be very precise and accurate. The materials used need to be non-corrosive with sulphuric cid otherwise the pipeline will corrode away very quickly as the main purpose of this pipeline will be to carry this chemical around the chemical plant. We need to make sure that the material for the pipe is acid resistant and to manufacture such material or buy it is very expensive. Thus when we make it we should be very careful and correct. One material is the pipeline pigs which keep the inner wall of the pipe clean. This is possible because the pig body is of elongated cylindrical construction with the outside diameter of the pig body being substantially that of the pipeline in which the pig is to be employed. There are a few methods of making pipes; the manufacturing of pipes had evolved over time. There is the furnace butt-welding process, the wrought iron tubes were formed into 20 foot long pieces of flat stock by drawing the burning hot pieces through a welding bell. This welding bell forced the flat stock into a cylindrical shape. The second type of manufacturing was the furnace lap-welding process. In this the 20 foot long plates were made on pyramid rolls. The long edges of the plates were scarfed from the flame before forming. After this they were shaped by the pyramid rolls. The red hot cans were reheated and the hot air was sent towards the tapered edges, eventually it formed the shape of a circle. The third method of manufacturing pipes was the electric resistance welded pipe. This was made from plates or coils of steel strips. All types of forming for this method were done at room temperature. The edges were sheared; large mills with mechanical rollers shaped the skelp then into a cylinder. The electric current heated the edges, the hot metal bonded as the edges were forced together mechanically. The next type of pipe was the seamless pipe. It was formed from a solid round billet. This billet was made into an oval shape by spiraling it between two rolls. The billet was forced onto and around a stationary piercing mandrel as a tensile-stress-induced separation developed in the center of the oval billet. This was then reheated and pushed over on a solid plug which reduced the thickness. This also helped in making it longer and finally any irregularities were removed making it smooth. The electric flash welded pipe came after this. This was a cold process in which the skelp was formed into 40 foot long cans. The edges were forced together mechanically and an electric current heated it. Any excess material was exuded inside or outside the pipe. Other excess material was trimmed off leaving a flash both inside and outside. The straight seam submerged arc welded pipe is next in line. This was made by cold forming 40 foot long steel plates into cans and then joining the edges with an added filler metal weld. The process is termed submerged-arc because the arc is created between a continuously supplied filler metal and the can and maintained within a bed of powdered flux. The heat melts the flux and the filler weld. Now the double submerged arc process is used. In this both inside and outside weld bead is deposited, super ceded the submerged arc process with its weld bead only on the outside. In this each piece is passed through cold expansion, and internal hydraulic pressure is used to plastically deform the pipe against an external die. (Kiefner and Trench, 2001) Bibliography 1. Boat propeller, Accessed on June 10, 2008 from http://www.freepatentsonline.com/7025642.html 2. John F. Kiefner and Cheryl J. Trench, (2001) Oil Pipeline Characteristics and Risk Factors: Illustrations from the Decade of Construction, Accessed on June 10, 2008 from http://committees.api.org/pipeline/ppts/docs/decadefinal.pdf 3. Max Wawrzyniak, Obsolete Outboards, Accessed on June 10, 2008 from http://www.duckworksmagazine.com/05/columns/max/12/index.htm 4. METHOD OF MANUFACTURING PLASTIC CARRIER BAGS, Accessed on June 10, 2008 from http://www.freepatentsonline.com/3593622.html 5. Teaching with Historic Places Lesson Plan, Accessed on June 10, 2008 from http://www.saugus.mec.edu/District/TAHG/LessonPlans/PrimaryManufacturing.pdf. Read More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“The Manufacturing Process for Plastic Bags, Pipelines, and the Essay”, n.d.)
The Manufacturing Process for Plastic Bags, Pipelines, and the Essay. Retrieved from https://studentshare.org/technology/1528960-manufacturing-technology-essay
(The Manufacturing Process for Plastic Bags, Pipelines, and the Essay)
The Manufacturing Process for Plastic Bags, Pipelines, and the Essay. https://studentshare.org/technology/1528960-manufacturing-technology-essay.
“The Manufacturing Process for Plastic Bags, Pipelines, and the Essay”, n.d. https://studentshare.org/technology/1528960-manufacturing-technology-essay.
  • Cited: 0 times

CHECK THESE SAMPLES OF The Manufacturing Process for Plastic Bags, Pipelines, and the Propeller for an Outboard Maritime Motor

Why Plastic Bags Should Be Banned

Name: Instructor: Course: Date: Why plastic bags should be banned Outline a.... Introduction This section will introduce environmental and health hazards caused by plastic bags with the aim of persuading the city authorities, manufacturers, retail shop owners and customers to put an end to the use of the bags.... Hazards faced by marine life due to plastic bags This section will discuss how marine life such as reptiles, birds and mammals are affected by plastic bags....
7 Pages (1750 words) Essay

Life Cycle of Plastic Bags

Besides, there are many other concerns associated with the use of plastic bags that are of huge significance to the environment and ecology.... Use of plastic bags has been globally condemned and criticized with reasonable arguments.... This paper elaborates the life cycle of plastic bags and critically analyzes the environmental effects of each stage of their life cycle.... Furthermore, various alternatives that can help eliminate the draw backs of plastic bags while maintaining the capacity to deliver the same usability are also enlisted in the paper....
9 Pages (2250 words) Essay

Eco-Friendly Plastic Bag

This research paper "Eco-Friendly Plastic Bag" focuses on the importance of conducting more researches on eco-friendly bags and create awareness on the importance of eco-friendly plastic bags in the conservation of the environment as plastic bags have negative effects.... hellip; plastic bags are used for packaging and is made of a thin, flexible plastic film such as polyethylene, non-woven fabric or plastic textile.... Around the globe, over 500 billion non-reusable plastic bags are used every year while the thin ones are littered ubiquitously....
5 Pages (1250 words) Research Proposal

Why People Should Pay for Plastic Bags

This paper makes a conclusion that the modern state of the environment as well as the threats imposed by plastic bags on it and on public health suggest that the use of plastic bags should be limited, and one of the ways to decrease the use is to make people pay for plastic bags in stores.... hellip; According to the report people suffer from plastic bags as well as they are forced to live in polluted cities and eat contaminated food and then face serious problems with their health....
5 Pages (1250 words) Research Paper

Propellers and Propeller System

Suppose the blade angle is constant the angle of attack of the relative airflow would vary across the propeller disc thus leading to the module being stalled.... At the time of propeller rotation, air flows past the propeller blade producing an aerodynamic reaction that gets resolution into thrust and propeller torque.... The engine needs to create a force in order to rotate the propeller.... The paper “Propellers and propeller System” will look at a propeller blade, which is an airfoil that moves the plane through the air by converting the rotating power of the engine into thrust....
2 Pages (500 words) Assignment

The Ban on Plastic Bags

This paper ''plastic bags'' tells that the city council of Cupertino passed a reusable bag ordinance that went to effect on October 1, 2013.... plastic bags became popular in Sweden in the year 1962 because of an increase in the market for petroleum product-derived compounds know as polyethylene.... nbsp;… The residents of California use more than 10 billion plastic bags annually.... It is further estimated that 100 billion plastic bags are used in the entire United States every year (Visser)....
6 Pages (1500 words) Essay

Propeller Maintenance: Tiger Moth Aircraft and Spitfire Mk XI

The author of the "Propeller Maintenance: Tiger Moth Aircraft and Spitfire Mk XI" paper shows how a technician can remove and put into storage the propeller from the Tiger moth aircraft, by using another one from a Spitfire Mk XI by ensuring the correct storage procedures are carried out.... nbsp;  the propeller is more often than not attached to the crankshaft of a piston engine, either directly or through a reduction unit.... hellip; The Tiger Moth one-piece fixed wooden pitch propeller had no cracks and I only had to make sure that the wooden propeller was stored properly where there was no exposure of moisture....
12 Pages (3000 words) Coursework

CES: Manufacturing Process Selection

The "CES: manufacturing process Selection" paper states that the plotting of the embodied energies for the polymers demonstrates the fact that the initial two materials in the list have low embodied Energies than the rest of the polymers and elastomer.... The choice of processes in the manufacturing also involved diversification by applying a combination of interrelated processes, design of shapes, economic implication of the processes and the performance of the designed products referred to as components in this study....
14 Pages (3500 words) Coursework
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Contact Us