We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byLogan Prest
Modified about 1 year ago
UNIT 16: Extrusion and Injection moulding Manufacturing Engineering Unit 16 Copyright © 2012 MDIS. All rights reserved. 1
6-2Unit 16 Copyright © 2012 MDIS. All rights reserved. Extrusion of Polymers A polymer stock is fed to a hopper. This feeds the main extruder of the machine. Here a rotating screw with transports the material beads thru' the heated barrel. The barrel is externally heated using band heaters in controlled temperature profiles so that the polymer softens. The screw of the extruder is a variable depth, variable pitch screw. It pushes the materials along the axis of the barrel in a way similar to the Archimedes screw,
6-3Unit 16 Copyright © 2012 MDIS. All rights reserved. it causes a compression of the plastic. This compression also makes the by the time it reaches the extruder die. The melt is pushed through the die which is designed to provide the correct shape of the extruded The die is created from special tool steels, and is also heated. It contains special flow control zones and paths that lead to a uniform wall thickness in the final profile. Downstream of the extruder is the cooling tank, and the pulling apparatus, to draw the continuously extruded profiles through the cooling tank to the winding or cutting section. The cutter is a timed device that travels along with the extruded material to cut to precise lengths as desired by the manufacture.
Injection moulding The hopper feeds the injection screw, which is similar to the extruder screw in design. The barrel of the injection moulding machine is divided into several heating zones with a temperature profile that causes the melting. 30 percent of the heat for the melting is provided by the shearing forces from the screw rotation. Once the melt reaches the end of the barrel, it enters the metering zone where a controlled volume of the melt reaches the injection zone. The screw is pushed towards the nozzle of the barrel, shooting the melt at tremendous pressure into the die attached to the mold platten. 6-4Unit 16 Copyright © 2012 MDIS. All rights reserved.
The molding on this side now involves a sequence of operations like mold closing, injection, cooling, mold opening and part ejection. Mold open and close are achieved by the moving platten which is hydraulically operated on the other side of the machine. Ejected parts are collected in a chute below the plattens and can be moved to a conveyor for further manufacturing processes. 6-5Unit 16 Copyright © 2012 MDIS. All rights reserved.
ISE 316 Manufacturing Engineering I: Processes Polymer Processing.
1 SHAPING PROCESSES FOR PLASTICS Chapter 13- Part 1 Properties of Polymer Melts Extrusion Manufacturing Processes, 1311 Dr Simin Nasseri Southern Polytechnic.
Extrusion-Based Processes. Profile Extrusion Solid parts that have shapes other than simple round rods of flat sheets are called profile shapes/profiles.
© Learning and Teaching Scotland 2006 Plastics processes Injection moulding Extrusion Blow moulding Vacuum forming Compression moulding Calendering Line.
Materials processing and forming Year 11 Resistant Materials PK/2011 Bitesize clip – Production techniques
ISE Manufacturing Processes Engineering Chapter 19 BULK DEFORMATION PROCESSES IN METALWORKING Rolling Other Deformation Processes Related to Rolling.
Bulk Deformation Processes in Metal Forming Chapter 19 Part 2- Forging Manufacturing Processes, MET1311 Dr Simin Nasseri Southern Polytechnic State University.
Distribution Equipment. Motion Control for Packaging Machine Distribution Equipment Accumulators Cap Applicators Card-Board Packers Film Wrappers Handle.
Traditional Manufacturing Processes Casting Forming Sheet metal processing Cutting Joining Powder- and Ceramics Processing Plastics processing Surface.
© Learning and Teaching Scotland 2006 Metal processes Press forming Sand casting Die casting Milling Centre lathe turning.
2.008 Design & Manufacturing II Spring 2004 Polymer Processing II Injection Molding spring-2004 S. Kim 1.
What Is Press Forming Where Is It Used In Manufacturing? Advantage/Disadvantages Materials Used Process.
Mold Requirements Chapter 3 Professor Joseph Greene All rights reserved Copyright 2000.
UNIT -6 Rapid Tooling 1. Copper polyamide Copper polyamide is a new metal plastic composite designed for short run tooling applications (100 to 400 parts)
1 - BasM Injection Molding & Advanced Process Control SPE Automotive TPO Global Conference 2009.
Power Tools & Equipment Chapter 4. Compressed Air Systems Air Compressor- A machine by which outside air is drawn in, compressed into a tank or cylinder,
Refrigerators. Reversing the Flow Heat flow through an engine was used to generate work. Heat flow through an engine was used to generate work. Work can.
INTRODUCTION. Press working is a method of mass production involving the cold working of metals, usually in the form of thin sheet or strip. Press working.
Basketball By: Barrington Powell Intro to Chemistry: 5 th hour.
By SYED ASGHAR ABBAS NAQVI. SLIDING VANE LIQUID PISTON HELICAL LOBE SCREW LOBED BLOWER COMPRESSOR INTERMITTENT FLOW CONTINOUS FLOW POSTIVE DISPLACEMNT.
Purpose of a VPA Filling & Metering Pump… Imagine having an employee who constantly measures out a precise dose of liquid whenever it’s needed.
Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website.
1 Pneumatic Cylinders Chapter 3. 2 Basic Operation A cylinder is a device used to produce linear motion. It is composed of 2 basic assemblies, the barrel.
MECHANICAL PROPERTIES OF MATERIALS Manufacturing Processes, 1311 Dr Simin Nasseri Southern Polytechnic State University.
Work in Fluid Systems Both liquids and gases are fluids. A fluid is a material that can flow, has no definite shape of its own, and conforms to the shape.
Review 29:008 Exam 2. Ch. 6 Energy & Oscillations.
Heat Engines Heat Pumps Physics Montwood High School R. Casao.
Pneumatics - Use Some examples of everyday pneumatic systems are shown below. How many do you recognise?
Food Safety Site Evaluations. 1.) Learn what the customer does 2.) Specific areas of concern 3.) Current treatment technologies 4.) What are their food.
Processing of Powder Metals, Ceramics, Glass & Superconductors.
© 2016 SlidePlayer.com Inc. All rights reserved.