Universiti Kebangsaan Malaysia Faculty of Engineering and Built Environment Department of Mechanical and Manufacturing Engineering KKKM2833 Manufacturing Processes Manufacturing processes of comb

1. Faculty of Engineering and Built Environment
Lecturers:
Prof. Dr. Andanastuti Muchtar
Dr. Nashrah Hani binti Jamadon
Dr. Nabilah Afiqah binti Mohd Radzuan
Department of Mechanical and Manufacturing Engineering

2. MANUFACTURING PROCESSES
KKKM 2833 Manufacturing Processes
Sem 2 Session 2020/2021
Prepared by:
COMB-INE
COMB

3. TEAM MEMBERS
Informationand
Data Collector
MUHAMMADAIMAN
ASYRAF BIN MOHD FAROK
OOI WEI LIANG
Video Editor
Photographer &
Videographer
Informationand Data
Collector
Slide Editor
MUHAMAD AMIN SHUKRAN
BIN MOHAMAD YAZID
MUHAMMAD ALIF BIN
MOHD FAIROZ
WAN NUR LIYANA BINTI
WAN MOHD RIDZUAN

4. Application of Product
1st
A tool that consists of
a shaft and a row of
teeth
4th
2nd
Purpose :
To pull a comb
through your hair and
arrange it.
3rd
Common application :
Straighten hair before
tying it up.
Used to untangle wet
hair and fix stray
hairs.

5. Material used to
make plastic combs.
Polymer that is
classified as a
thermoplastic.
Addition
polymerisation
process is used to
produce
polypropylene.
Double bonds
between carbon
atoms in ethylene
monomers are
induced to open up
----What is polypropylene ???----
https://www.thoughtco.com/what-is-
polypropylene-820365

6. https://www.webassign.net/question_assets/wertzcams3/ch_13/manual.html

7. 1
Thermoplastic is a
convenient material when
comes to respond to heat
2
Liquefy at low melting
point which roughly 160
degree celsius which uses
less energy.
3
Easily being injected
into mold and then
subsequently recycled
4
Ability to adapt to
various fabrication
techniques
“ Material Properties ”
… Material
Properties...

8. Lightweight
• It is easier to carry around
for daily use.
Chemical resistance
• It is highly resistant to acids,
bases and many solvents
hence it is not easy to
react with chemicals.
Fatigue resistant
properties
• It able to retain shape
after experiencing torsion,
bending or flexing.
Good electric and heat insulator
• Electrons and ions are bound in the
structure and cannot move easily
Elasticityand Toughness
• Polypropylene will act with high elasticity over a certain range
of deflection, but it will also experience plastic deformation
early in the deformation process, so it is generally considered
a "tough" material.
Good tensile
strength
• It is around 4800 psi.
Thus, allowing the
material to withstand
heavy load.
Physical
Properties

9. HOW TO
MANUFACTURE
COMB?

10. CLAMPING
COOLING
01
02
EJECTION
POST PROCESSING
03
04
PLASTIC
INJECTION
MOLDING
05
INJECTION

11. The hydraulically powered
clamping unit pushes the
mold halves together and
exerts sufficient force to
keep the mold securely
closed while the material
(polypropelene) is injected.
-Plastic will solidify into the
shape of the mold during the
cooling process.
-The mold can not be opened
until the required cooling time
has elapsed as the plastic will
solidify completely
Polypropylene pellets are fed into
the injection molding machine.
During this process, the material is
melted by heat and pressure which
occurs at 200℃ to 300℃ and at
maximum 150 atm before being
injected into the mold by the
injection unit.
-The cooled part (plastic comb)
will be ejected from the mold
usually at 60℃ by the ejection
system.
-Forcemust be applied to eject
the part because during cooling
the part shrinks and adheres to
the mold.
1. CLAMPING
2. INJECTION 4. EJECTION
3. COOLING 5. POST
PROCESSING
The productwhich is the comb
will go through buffing and
polishing process and printing
process will be carried out for
the product’s aesthetic value.
(if needed)

12. PLASTIC INJECTION MOLDING PROCESS
pinterest.com
https://easchangesystems.com/applic
ation/plastic-injection-molding/

13. MOLD CAVITY FOR COMB
https://mp-mfg.com/product-item/plastic-injection-mold-
for-washing-comb/
https://m.made-in-china.com/product/Fully-
Automatic-Plastic-Comb-Mold-with-Sub-Gate-
704699901.html
This is an example for mold cavity for comb. As
we can see, there are a lot of cavities in one
plate so that it can simultaneously injected with
melted polypropelene pallet by the injection
unit. Thus, it can produce large scale of
products in the short time which good for mass
production.

14. The scrap material that resulted
from post processing can be
recycled back into pellets for
another manufacturing process.
DO YOU
KNOW ?
??

15. ➢ A reputable retailer and manufacturer
of high-quality household hardware
in Malaysia.
➢ They have the most diverse and
comprehensive product categories
➢ Before establishing Aeng Wah, they started
the business as a professional distributor
for hair and beauty equipment under the
name ENGWAH in Georgetown, Malaysia
for almost 15 years.
➢ Aeng Wah Trading Company Sdn Bhd was
founded in the year 2000, and they began
the business as a manufacturer as well as a
distributor of hair and beauty equipment.
Yong Qiang
Trading Sdn Bhd
in Pontian, Johor
Aeng Wah
Trading Co. Sdn
Bhd in Penang
LOCAL COMPANY IN MALAYSIA MANUFACTURES COMB

16. THANK YOU

17. REFERENCES
• Engineering ToolBox, (2005). Thermoplastics - Physical Properties. [online] Available at:
https://www.engineeringtoolbox.com/physical-properties-thermoplastics-d_808.html [Accessed Day Mo.
Year].
• Cambridge Dictionary. (2021, April 14). comb definition: 1. a flat piece of plastic, wood, or metal with a thin
row of long, narrow parts along one side. . .. Learn more.
https://dictionary.cambridge.org/dictionary/english/comb
• Plastic comb. (2020). Plastic Comb.
http://industries.telangana.gov.in/Library/Incentives%20PDFs/RubberPlastics/plastic_comb.pdf
• Injection Molding Process, Defects, Plastic. (2020). Custompart.Net.
https://www.custompartnet.com/wu/InjectionMolding#:%7E:text=Clamping%20%2D%20Prior%20to%20the%
20injection,half%20is%20allowed%20to%20slide

18. REFERENCES
• D. (2021a, January 31). how to set parameter of injection molding machine. China Top Plastic
Injection Molding Machine Manufacturer And Supplier.
http://www.dayamachinery.com/how-to-set-parameter-of-injection-
moldingmachine/#:%7E:text=Temperature%3A%20set%20low%20barrel%20heating,damage
%20the%20mould%20and%20machine
• S. (2021b, January 7). temperature control of injection mold. Topworks Plastic Mold.
https://www.plasticmoulds.net/temperaturecontrol.html#:%7E:text=Plastic%20injection%20mo
lding%20typically%20occurs,transferred%20back%20to%20the%20mold