DESIGN AND FABRICATION OF MANUAL PAPER SHREDDING
MACHINE
BY
UCHENDU, EZINNA STEVEN
MOUAU/MEE/13/28422
DEPARTMENT OF MECHANICAL ENGINEERING
COLLEGE OF ENGINEERING AND ENGINEERING TECHNOLOGY
MICHAEL OKPARA UNIVERSITY OF AGRICULTURE, UMUDIKE
FEBUARY, 2020
Design and Fabrication of Cross Cut Paper Shredding Machine
1.0 Introduction
Paper is formed from wood pulp. The wood pulp is compressed to form flexible thin sheet. The
thin shit of intertwined fibre is paper. Paper is the substance that forms a document and hence
contains sensitive information.
It is necessary to prevent this information from getting to the wrong hands. The way forward
was to destroy paper in a way that its content is of no use before discarding.
Privacy experts often recommend that individuals shred bills, tax documents, credit card and
bank account statements, and other items which could be used by thieves to commit fraud or
identity theft. This requires many studies to produce a device to serve this purpose. This is the
origin of the paper shredding machine. Paper was invented in China, in 105 AD, by the Chinese
Eunuch Ts'aiLun. After the Chinese discovered paper, it took 500 years for paper to be used in
Europe and through the years, the necessity for the paper to be destroyed rose to a high degree.
By the 20th century, the paper was very popular and needed in almost every human activities.
It is use cuts across personal needs to industrial/company use. Moreover, then, in 1909, almost
6000 years after the invention of papyrus, the first Paper Shredding machine was invented by
a man called Abbott Augustus Low.
1.1 Specific Objectives of the work
1. To design paper shredder that is suite to its application especially TO shred papers.
2. To minimize the manufacturing cost by minimizing the complexity of the paper
shredder and materials used.
3. To fabricate and introduce the new concepts and ideas for future prospect of paper
shredder.
2.0 Materials and Methods
The following are the significant parts that make up the paper shredding machine.
 The machine frame
 Shredder support
 Bearing
 Cutting blades
2.1 Tools and machines used during the design and construction of the paper shredding
machine.
 Grinding machine: The grinding machine with the aid of a cutting disc was used for
cutting of the metal pan as well as the shaft to the required dimension.
 Tape: A tape rule was used to measure the metal sheet and the shaft.
 Steel chalk: Steel chalk was used to mark out the measured length of the metal sheet as
well as other components, used that required measurement.
 Vice: The bench vice was used mainly for holding the workpiece during the cutting
operation.
 Drilling machine: The drilling machine was used to drill holes.
 Electric Arc Welding Machine: Electric arc welding machine was used for welding the
machine frame and other components.
2.3 Construction procedures
 Marking Out: The purchased mild steel material and other metallic parts were
measured using a tape rule and marked according to design specification with the
aid of steel chalk. The dimension 525mm×400mm×200mm was measured and
marked.
 Cutting: The marked sections of the mild steel material were cut out from the
purchased bulk material according to specification with the aid of a grinding
machine using a cutting disc.
 Folding: The cut off parts that required folding were folded with the aid of a folding
machine to obtain a 90degrees angle.
 Welding: Tack welding was done to join the folded edges as well as the cut-off parts
together after that welding was carried out by Manual Arc Welding (MMAW)
process with E6013 electrode.
 Deslagging: Chipping hammer and wire brush were used to remove the impurities
from the welded frame after welding operation was completed.
 Drilling: Drilling operation was performed in the section of the machine that
required drilling after welding was completed. A drilling bit of 5” was used for the
drilling machine to drill holes.
2.4 Basic parts of the paper shredded machine
Frame
Bearing
Shaft
Cutting Blade
Handle
 Cutting Blade: The cutting blade is rectangular in shape and it is mounted on the main
shaft. This blade is used to cut the paper in vertical direction. Cutting blades are
designed with Mild Steel material with the specification are 14 blades.
 Shaft: The main shaft serves as the cutting blade holder. The main shaft has a circular
shape and its ends are mounted on holder bearings.
 Handle: The handle of the shredder helps to rotate the shaft.
 Bearing: The bearing is used to enable the rotational movement of the shaft, while
reducing friction and handling stress
 Frame: The frame is the structural part of the machine that houses and support the other
parts of the machine.
2.5 Working Principle of the Machine
The cross-cut paper shredding machine is a simple machine that can be operated manually.
After assembling the components, the machine is operated manually by using the handle to
rotate the shaft. The cutting blade is joined on the periphery of the shaft. When this is done,
paper can be fed through the diamond shaped shredder and converted into strips.
Conclusion
To minimize the limitation of conventional paper shredder machine, the cross-cut manual
shredder machine is more applicable. A prototype has been developed to fulfil the requirement.
The machine is made of blades arranged to shred paper papers for the purpose of destroying
secret information and preparing waste paper for recycling. The machine is easy to operate and
maintain.