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Manufacturing Process of TOOTHBRUSH Marco Mirabella 马可 (1156409) Course of Manufacturing-Tongji...
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Transcript of Manufacturing Process of TOOTHBRUSH Marco Mirabella 马可 (1156409) Course of Manufacturing-Tongji...
Manufacturing Process of TOOTHBRUSH
Marco Mirabella 马可 (1156409) Course of Manufacturing-Tongji University
Background
• A toothbrush is a mental equipment used for cleaning teeth
• It is composed by a plastic handle and a nylon bristle attached to the brush head
• The total market from 1990’s has swelled 600 million $ ( 3755728544 ¥)
• The first toothbrush known belongs to the Egyptian period 3000BC
Marco Mirabella 马可 (1156409) Course of Manufacturing-Tongji University
Marco Mirabella 马可 (1156409) Course of Manufacturing-Tongji University
Manufacturing phases1. Molding the handles
2. Filling the core with bristles3. Trimming the bristles
The Manufacturing process is composed upon 3 processes :
Molding the handles
1. Plastic is mixed and shaped into pellets2. The pellets are placed in an injection molding
machine(IMM), which melts the plastic.3. A rotating screw or plunger forces the liquid into the
handle mold.• The mold hold form the entire handle including small holes
called cores.4. The molds are securely clamped, and pressure is
applied while plastic cools. 5. Once the molds are cooled, the clamps are removed
and small pins push the handles out
The Molding process is undergone by an injection molding machine, it is composed by 5 steps:
Marco Mirabella 马可 (1156409) Course of Manufacturing-Tongji University
Marco Mirabella 马可 (1156409) Course of Manufacturing-Tongji University
Further explanation on IMM The injection molding machine(IMM) is also is also known as injection press. It has two main part: Injection unitClamping unitIn the injection unit:• Polymers are injected into the injection barrel • Material is heated by heaters till the melting point to form
the liquid• Plastic fluid is injected into the molds where it cools offIn the clamping unit:• The material is carefully removed from the molds by a pin
Filling the core
Marco Mirabella 马可 (1156409) Course of Manufacturing-Tongji University
The filling process involves the core and the bristles:• Bristles are very thin wires ,usually made by nylon• The cores are small holes located in the head of the
toothbrushIn the filling process:• Bristles are stapled into the core with tiny metal
staples• All the process is completely automated
Trimming the bristles
Marco Mirabella 马可 (1156409) Course of Manufacturing-Tongji University
The final process in the production of toothbrushes is called trimming:In this process:• The toothbrush pass throughout a trimming machine
that slices the bristles.The scope of this process:• Have all the bristles with the same length • Obtain a good design for the head of the toothbrush
Curiosity and History• The first toothbrush developed by Egyptians was
made by twigs and leaves• Indian, Greek and Roman use frayed twigs to
penetrate more effectively between teeth• In the 15th century Chinese developed the first
sophisticated toothbrush• Until 1900’s bristle were made by Siberian hog hair • In 1961 the first electric toothbrush was developed • Oral-B is the most common brand for toothbrush• A toothbrush should be changed once every two
months
Marco Mirabella 马可 (1156409) Course of Manufacturing-Tongji University
Thank you