1. ABSTRACT
This case study deals with the processing of raw material i.e., tin metal sheets through
various manufacturing stages.
The main manufacturing stages includes cutting of tin metal sheets as per desired
dimensions, edging of metal sheets, cornering of the metal sheets and then assembling of the
processed sheets by Seaming process.
The sealing of the assembled tin containers is one of the most important process ,since
any leakage may damage and reduce the quality of the finished product.
These finished containers are stored in a clean environment and thus supplied to
various industries as per their requirements.

2. Properties of Tin(Sn)
Tin is a malleable, silvery metallic element obtained chiefly from cassiterite. It’s atomic
number is 50 on the periodic table.
The physical properties of Tin are:
 Color – Silver white
 Malleability – Capable of being shaped or bent into extremely thin sheet
 Ductility – Easily pulled or stretched into thin wire
 Conductivity – Good transmission of heat or electricity
The chemical properties of Tin are:
 Oxidation – Not easily oxidised
 Reactivity with water – Stable in both cold and boiling water
 Reactivity with acids – Does not react rapidly
 Toxicity – Relatively low
 Corrosion – Resist corrosion because it is protected by oxide film.
Based on above properties, Tin metal sheets are used as raw materials in the manufacturing of
the containers. Since Tin containers are non- toxic and non- corrosive, they are used in the
storage of food products like cashew nuts. Thus they can be stored in these containers for a
longer time and thus increasing the quality of the products.

3. Stages of manufacturing if Tin metal sheets
18.25*14 inch
Cutting of metal sheets
by metal sheet cutter
10*10 inch
Filleting the edges of
metal sheet to a fillet
of 0.7 inch
Edging of metal
sheets to a fillet
radius of 1.2 inch
Punching of
edged metal
sheets
Punching a hole
of dia. 2 inch into
the metal sheet
Assembly of four
corners of the tin
container
Assembly of top &
bottom metal sheets to
the assembled tin
container by using
Seaming machine
Soldering process
for sealing the tin
container
Cornering of metal sheets to an
angle of 90degree using manually
operated hydraulic press
Punching of name of factory on
the metal sheet
Storage of
containers

4. Stage 1: Cutting of metal sheets by metal sheet cutter
The tin metal sheets of dimension 36.5*28 are cut into two different sheets of dimensions
10*10 and 18.25*14. The sheets of 10*10 dimensions are then edged.

5. Stage 2 : Edging of metal sheets
The metal sheet of a 10*10 dimension is subjected to edging by using a device called sheet
edge cutter. The edge is filleted to a radius of 1.2 inch

6. Stage 3: Punching of edged metal sheets
The edged metal sheets are punched using a hand operated punching machine

7. Stage 4 : Punching the name of factory on the metal sheet
The metal sheets cut to a 18.25*14 dimension is filleted at the edges by 0.7 inch. The name of
the factory is punched on the edge filleted sheets. The punching is done by manually operated
punching press.

8. Stage 5 : Cornering of metal sheets
In this stage the edge filleted metal sheet is cornered to an angle of 90 by using manually
operated hydraulic press. It consists of a flywheel connected to the motor by a flat belt. Here
the rotary motion of the flywheel is converted into reciprocatory motion by the worm gear.
This results in the application of force in the perpendicular direction to the metal sheets.

9. Stage 6: Assembly of four corners of tin container
The metal sheets after cornering are subjected to assembly of the corners. In this process, the
four sheets are held at the corners and punching is performed.

10. Stage 7: Assembly of the container
The assembly of top and bottom sheets with the containers is done by Seaming machine. The
Seaming machine fits the top and bottom sheets to the corners of the container. The
containers after Seaming process, are passed through the conveyor

11. Stage 8: Sealing of Tin containers
Tin containers are sealed properly by soldering process. Copper is used as a solder. Zinc
Chloride(ZnCl2) acid is applied at the corners and then solder is applied followed by a red hot
iron sealer, which makes the solder to adhere at the corners and for a seal.

12. Stage 9: Storage of containers
The containers after sealing are cleaned properly and stored in a clean environment. The
containers are then supplied to the industries. Each container weighs 800 gms. These
containers can carry a load upto 10kg. About 500 containers are processed per day and the
production may exceed the given number based on the industrial demand.