This document discusses various plastic processing techniques. It begins by defining polymers and plastics, noting that polymers are composed of repeating monomer units and occur naturally or can be synthetic. Plastics are typically organic polymers that can be molded. The document then discusses two main types of plastics - thermoplastics, which can be remelted and reshaped, and thermosetting plastics, which permanently set their shape after heating. It proceeds to describe several plastic processing methods like injection molding, compression molding, and extrusion.
http://www.spiratex.com/ : Understand the complete process of custom plastic extrusion with step by step details of the process through this presentation. It also explains the various specialized forms of plastic extrusions.
Blow Molding is defined appropriately and also the process compatible materials are listed. Blow Molding is broadly classified as - extrusion type, injection type, Multilayer type. All three processes are explained appropriately with diagrams and their application is also listed. Since every thing has advantages and disadvantages, so is the case with blow molding. References are also cited correctly. I hope you all find it useful
http://www.spiratex.com/ : Understand the complete process of custom plastic extrusion with step by step details of the process through this presentation. It also explains the various specialized forms of plastic extrusions.
Blow Molding is defined appropriately and also the process compatible materials are listed. Blow Molding is broadly classified as - extrusion type, injection type, Multilayer type. All three processes are explained appropriately with diagrams and their application is also listed. Since every thing has advantages and disadvantages, so is the case with blow molding. References are also cited correctly. I hope you all find it useful
My presentation on resin transfer molding. Not much description included. For reference i would recommend
" Composite manufacturing by Sanjay Mazumdar".
RTM is a low-pressure molding process, where a mixed resin and catalyst are injected into a closed mold containing a fiber pack or preform . when the resin has cured the mold can be opened and finished component removed.
Blow Molding Process on Manufacturing Technology .
Tackles about the definition of Blow molding process, its various types , advantages and disadvantages and the application of it on a manufacturing set-up.
PLASTIC MOULDING and Methods involving in itGaurav Tyagi
plastic moulding a topic with some less knowledges
but surely help out the masters as well as unger graduates in their assignments
no need to modify just go through it and take some innovative ideas and some will be making some more better ones
but for those who are in a hurry and want to minimise their time or wants to save their time its a copmlete package just go through it
My presentation on resin transfer molding. Not much description included. For reference i would recommend
" Composite manufacturing by Sanjay Mazumdar".
RTM is a low-pressure molding process, where a mixed resin and catalyst are injected into a closed mold containing a fiber pack or preform . when the resin has cured the mold can be opened and finished component removed.
Blow Molding Process on Manufacturing Technology .
Tackles about the definition of Blow molding process, its various types , advantages and disadvantages and the application of it on a manufacturing set-up.
PLASTIC MOULDING and Methods involving in itGaurav Tyagi
plastic moulding a topic with some less knowledges
but surely help out the masters as well as unger graduates in their assignments
no need to modify just go through it and take some innovative ideas and some will be making some more better ones
but for those who are in a hurry and want to minimise their time or wants to save their time its a copmlete package just go through it
A review on advanced ceramic processing techniquesAlokjyoti Dash
This Presentation enlists and describes most ceramic process and most parameters which affect these ceramic processing. A reader shall understand the basic of these presented process to fabricate unique ceramic materials
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
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Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptx
Plastic Processing
1. Manufacturing Process - I
UNIT –III
Plastic Processing
Prepared By
Prof. Shinde Vishal Vasant
Assistant Professor
Dept. of Mechanical Engg.
NDMVP’S Karmaveer Baburao Thakare
College of Engg. Nashik
Contact No- 8928461713
E mail:- nilvasant22@gmail.com
Website:- www.vishalshindeblog.wordpress.com
PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK28/07/2016
2. Introduction
• Term “polymer”: greek poli (many) + meros (unit) = many
units
• Polymers are a large class of materials consisting of many
small molecules (called monomers) that can be linked
together to form long chains, thus they are known as
macromolecules (term introduced by H. Staudinger in
1920’s).
• A typical polymer may include tens thousands of
monomers. Because of their large size, polymers are
classified as macromolecules.
• Polymers occur naturally in the form of proteins,
cellulose(plants), starch(food) and natural rubber.
• Engineering polymers, however, are usually synthetic
polymers.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
3. • A plastic material is any of a wide range of synthetic
or semi-synthetic organic solids that are mouldable.
• Plastics are typically organic polymers of high
molecular mass, but they often contain other
substances.
• They are usually synthetic, most commonly derived
from petrochemicals, but many are partially natural.
• POLYMERIZATION: The simplest substances
consisting of one primary chemical are known as the
monomers or monoliths. They are to be combined or
synthesized to form polymers by the process known
as the polymerization.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
4. Properties of plastics
• Less brittle than glass ,hence can be made transparent
and smooth.
• Corrosion resistance.
• Low electrical and thermal conductivity, insulator.
• Easily formed into complex shapes, can be formed,
casted and joined.
• Wide choice of appearance, colors and transparencies.
• Light weight but posses good strength and rigidity.
• Low moisture absorption.
• Heat resistance.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
5. • Plastics can be divided into two classes.
1. Thermo plastics
2. Thermo setting plastics,
depending on how they are structurally and chemically
bonded & depending on Mechanical response at high
temperature.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
6. THERMO PLASTICS
• These plastics can be softened by heating and hardened by cooling any
number of times without changing the properties of the material.
• It is thus possible to shape and reshape these plastics by means of heat
and pressure.
• One important advantage of this variety of plastics is that scrap
obtained from old and worn-out articles can be effectively used again.
• Properties :
1. Softens and liquefies on heating and hardens up to cooling.
2. Retains shape after manufacture.
3. Suitable for recycling.
4. Can be reshaped by heat.
5. It may melt before passing to a gaseous state.
6. Allow plastic deformation when it is heated.
7. They are soluble in certain solvents.
8. Swell in the presence of certain solvents.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
7. • Examples and applications of thermoplastic plastic materials:
1. High pressure polyethylene as applied to rigid material
covered with electrical machines, tubes, etc...
2. Low pressure polyethylene elastic material used for insulation
of electrical cables, etc...
3. Polystyrene applied for electrical insulation, handles of tools...
4. Polyamide used for making ropes, belts, etc...
5. PVC or polyvinyl chloride for the manufacture of insulation
materials, pipes, containers, etc.
• Examples of thermoplastic adhesives:
1. Acrylates
2. Cyanoacrylates
3. Epoxy cured by ultraviolet radiation
4. Acrylates cured by ultraviolet radiation
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
8. THERMOSETTING PLASTICS
• These plastics are either originally soft or liquid or they soften
once upon heating, they harden permanently.
• When they are heated in the temperature of 127 degree
centigrade to 177 degree centigrade , they set permanently and
further application of heat does not alter their form of soften
them.
• The thermo setting plastics are durable, strong and hard.
• They are available in a variety of beautiful colours.
• They are mainly used in engineering applications of plastics.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
9. • Properties :
1. Permanently hard on heating above a certain temperature.
2. Undergoes chemical changes during manufacture.
3. Cannot be melted and reshaped.
• Examples and uses:
1. Polyester fibreglass systems: sheet moulding compounds and bulk
moulding compounds)
2. Polyurethanes: insulating foams, mattresses, coatings, adhesives, car
parts, print rollers, shoe soles, flooring, synthetic fibers, etc.
Polyurethane polymers are formed by combining two bi- or higher
functional monomers.
3. Vulcanized rubber
4. Bakelite, a phenol-formaldehyde resin used in electrical insulators and
plastic wares
5. Epoxy resin used as the matrix component in many fiber reinforced
plastics such as glass-reinforced plastic and graphite-reinforced plastic)
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
10. 28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
Sr.
No
Thermosetting plastics Thermo plastic
plastics
1 When subjected to heat and
pressure undergo permanent
deformation
Do not undergo any
permanent change by heat
and pressure
2 Cannot be reused Can be reused
3 They are stronger and have
more resistance to heat,
They are softer and has less
resistance to heat
4 Cheap and durable costlier and less durable
5 Used for telephone receivers,
radio, automobile parts and TV
cabinet, camera box, etc
Used for toy, toilet goods,
photographic films,
insulating tapes, etc
11. Processing of plastics
• A) Processing of thermo setting plastics
1. Compression moulding
2. Transfer moulding
• B) Processing of thermo plastic plastics
1.Injection moulding
2.Blow moulding
3.Thermo moulding/ thermo forming
4.Extrusion
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
12. Compression moulding
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
Pre-measured amount of polymer introduced into the heated mold
then the top half comes down and applies pressure.
Usually uses thermosetting plastics.
produces products like dishes, container caps, etc.
13. • A material is generally powder form or pre-form shape and it is
loaded directly into the hot die cavity
• Then required shape is given by application of heat & pressure
• The combined effect of heat and pressure causes the plastic to
flow into the mould cavity
• After compression, the component solidifies, the upper half of the
dies opens & component is removed with the help of ejector pins.
• Temp. during the process is from 125 to 250degree centigrade's
• Advantages:
1) moulds are simple & less expensive
2) Low residual stresses, low maintenance
3) Good surface finish
• Disadvantages:
1)Cycle time is long, low production rate
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
14. Transfer molding
• It is a process where the amount of material is measured and
inserted before the molding process takes place.
• The material is then preheated and loaded into a pot and a plunger is
then used to force the material from the pot through the runner
system into the mold cavities.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
15. • Transfer molding process combines the principle of
compression and transfer of the polymer charge. In the
transfer molding, polymer charge is transferred from the
transfer pot to the mold.
• The mold is cooled and molded part is ejected.
• In this process, the required amount of polymer charge is
weighted and inserted into the transfer pot before the
molding process.
• The transfer pot is heated by the heating element above the
melting temperature of the polymer charge.
• The plunger is used to push the liquid polymer charge from
the transfer pot into the mold cavity under pressure.
• This is used for mass production.
• It has short production cycle and smaller tolerances and
more intricate parts can be achieved.
• It produces more waste material; therefore it is the more
expensive process
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
16. • Materials Used:
• Generally, thermoset plastics (such as epoxy, polyester, phenol-
formaldehyde, vinyl ester,
• silicone) are processed by transfer molding process, but certain
thermoplastic materials can also be processed.
• Advantages:
• Fast setup time and lower setup costs
• Low maintenance cost
• Plastic parts with metal inserts can be made
• Design flexibility
• Dimensionally stable
• Uniform thickness of parts
• Large production rate
• Disadvantage:
• Wastage of material
• Production rate lower than injection molding
• Air can be trapped in the mold
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
18. - Probably the most common, most important, most economical process
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
19. Injection moulding
• Machine consist of two units, one is plastic injection unit &
another is clamping unit
• It mainly has two parts upon which the machines operates.
• On one end of the machine, the plastic is fed in the form of
pellets or granules which is then heated and melted at
higher temperatures prevalent inside the first compartment.
• The molten solution is the squeezed and collected at the
other end in mold structure of a desired shape held by the
clamping units.
• The clamping unit is removed and the mold is opened after
a while for the collected solution to cool.
• Upon cooling down, the molten solution solidifies and
takes the shape of the mold which collected it.
• In this way highly quality molds are manufactured by
various plastic injection molding companies.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
21. • Extrusion is a process used to create objects of a
fixed cross-sectional profile.
• A material is pushed or drawn through a die of
the desired cross-section.
• The two main advantages of this process over
other manufacturing processes are its ability to
create very complex cross-sections, and to work
materials that are brittle, because the material
only encounters compressive and shear stresses.
• It also forms finished parts with an excellent
surface finish.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
22. Blow molding
• Blow Molding
– Modified extrusion and
injection-molding
process
• Characteristics
– Hollow thin-walled
parts of various sizes
– High production rates
– Low cost for making
beverage and food
containers
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
23. Blow Molding
• Blow molding (also blow forming) is a manufacturing process by which
hollow plastic parts are formed.
• In general, there are three main types of blow molding:
– Extrusion blow molding
– Injection blow molding
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
24. Blow molding process
• The blow molding process begins with melting down
the plastic and forming it into a parison or preform.
• The parison is a tube-like piece of plastic with a hole in
one end in which compressed air can pass through.
• The parison is then clamped into a mold and air is
pumped into it.
• The air pressure then pushes the plastic out to match the
mold.
• Once the plastic has cooled and hardened the mold
opens up and the part is ejected.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
26. Extrusion Blow Molding
(1) and (2) parison is pinches at the top and sealed at the bottom around a
metal blow pin as the two halves of the mold come together
(3) the tube is inflated so that it takes the shape of the mold cavity
(4) mold is opened to remove the solidified part.
28/07/2016 PROF.V.V.SHINDE NDMVP'S
KBTCOE NASHIK
27. Most thermoplastics can be blow molded
Some typical applications are
HDPE : High Density Polyethylene (stiff bottle, toys,
cases, drum)
LDPE : Low Density Polyethylene (flexible bottle)
PP : Polypropylene (higher temperature bottle)
PVC : Polyvinyl Chloride (clear bottle, oil resistant
containers)
PET : Polyethylene terephthalate (soda pop bottle)
Application
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
28. Thermo forming/ Vacuum forming
• Thermoforming is the process involving heating a
plastic sheet and forming it into a cavity or over a
tool using vacuum, air pressure, and mechanical
means.
• TYPES OF THERMOFORMING
1) Vacuum Thermoforming
2) Pressure Thermoforming
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
29. Vacuum Forming
• The process involves shaping a preheated thermoplastic
sheet by means of vacuum produced in the mold cavity
space.
• The atmospheric pressure forces the soft sheet to
deform in conformity with the cavity shape.
• When the plastic comes into the contact with the mold
surface it cools down and hardens.
Pressure Thermoforming:-
• The process involves shaping a preheated thermoplastic
sheet by means of air pressure.
• The air pressure forces the soft sheet to deform in
conformity with the cavity shape.
• When the plastic comes into the contact with the mold
surface it cools down and hardens.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
30. Vacuum forming
• It is one of the type of the Thermoforming
Process in which vacuum is used to get the
desired shape.
• The process involves heating a plastic sheet until
soft and then draping it over a mould. A vacuum
is applied sucking the sheet into the mould. The
sheet is then ejected from the mould.
• Process in Detail
1) Clamping
The clamp frame ensures the plastic sheet is held
firmly in place during the forming process.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
31. • Heating
Radiant heaters are normally used to heat the sheet which has been
positioned over the aperture of the vacuum forming machine. For
thicker sheet both surfaces may need to be heated and more
sophisticated machines allow this. Heaters move into position both
above and below the sheet.
• Vacuum
A vacuum is applied, the sheet is drawn into intimate contact with
the mould and the mould detail is picked up.
• Cooling and Release
The material is allowed to cool. The cooling process may be
shortened with blown air or even a fine water spray. The molding
may then be released from the mould by introducing a small air
pressure.
• Finishing
After molding, any mould finishing may be performed, trimming,
cutting, drilling, polishing, decorating etc.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
35. • In wire coating process bare wire is pulled
through the center of the die similar to tubing die.
• The wire is coated as it is pulled through a die at
high speed
• A slight vacuum is maintained between polymer
and the wire to help in proper adhesion of the
coating
• The wire as it is pulled through the die provides
rigidity
• the coated wire after passing through a water
trough is wound on large spools
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
37. • Extrusion is one of the most common methods of
forming thermoplastic Films
• Combination of principles of extrusion and blowing to
form a thin film
• The operation starts by extrusion of a tube through the
extruder which is immediately forced upward and
simultaneously expanded in the size by blowing air into
it through the die mandrel
• The air pressure in the tube id kept constant to ensure
that the tube diameter and thickness are uniform
• The guide rolls and collapsing rolls restrain this bubble
and direct it to the pinch rolls. here the air in the tube is
sequenced out and the tube gets cooled
• The flat tube is collected by the wind up reel.
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
40. In this process the plastic material is allowed to pass
between the cylindrical rollers.
The process is used to prepare plain flat sheets of plastics.
The roller may be provided with artistic designs which will
appear on the finished product
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK
41. • The term “sheet” refers to stock with thickness between
0.5mm to 6mm
• Calendaring is the process of making films and sheets of
plastics
• In this method a mixture of resin, filler, plasticizer and color
pigments passed between a series of heated rollers
• This process is similar to rolling process in that the material
is compressed between rolls and emerges as a sheet
• Thickness of the produced sheet depends on the spacing
between the rollers
• During the process, first roll gap serves as a feeder, the
second as a metering device, and third one sets the guege of
the gradually cooling plastic which is then wound on the
coiler
• It is high production process and mostly suitable for flexible
P.V.C
28/07/2016 PROF.V.V.SHINDE NDMVP'S KBTCOE NASHIK