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HOW ITS MADE: Mechanical Pencil
Transcript of HOW ITS MADE: Mechanical Pencil
The Lead (Graphite)
The lead of a pencil is made of a graphite/clay mixture that is mixed and then heated, baked, cut, and tested for brittleness.
Typical erasers are made from synthetic rubber, but more expensive or specialized erasers are vinyl, plastic, or gum-like materials. Cheaper erasers can be made out of synthetic soy-based gum.
The Shaft ( plastic part)
The barrel of mechanical pencils must have sufficient space to hold between five and ten individual pencil leads. The barrel can be made from plastic, metal or a combination of rubber and plastic. A mold is created of the required shape and machines are used to produce the barrel.
A metal forming firm completes the creation of the pencil tip and any other metal parts. The tip is manufactured with screw grooves, as this is the most secure method of attaching the tip to the pencil barrel. The lead advancing mechanism is usually metal, and is created by the same firm. These pieces are forwarded to the assembly plant once the order is completed.
An assembler inserts the advancing mechanism into the barrel, checking to ensure that it functions properly. The pencil barrel is added to a conveyor belt, which takes it through a machine that inserts the pencil leads into the barrel. The tip is screwed into the barrel and the eraser is inserted into the top of the barrel
Finally workers place the final parts of the pencil; by screwing the last cone piece on, adding lead, placing spring inside lead caparment.The pencil is then placed into the packaging material such as plastic bags or cardboard boxes and prepared for shipment.