process anglais
DESCRIPTION
TRANSCRIPT
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Study of a process:
The paint
Lydie Magré – Chloé Vianez
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Introduction
• Primitive paintings
• Now ?
• Purpose
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Contents
I. Raw materials
II. The manufacturing process
III. Conclusion
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I. Raw materials
II. Manufacturing process
III. Conclusion
I. Raw materials• Components:
– pigments– solvents– resins– various additives
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I. Raw materials
II. Manufacturing process
III. Conclusion
I. Raw materials• The pigments
– white pigment > titanium dioxide– black pigment > carbon black– reds > iron oxide and cadmium
sulfide – yellows and oranges > metallic salts – blues and greens > iron blue and
chrome yellows
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I. Raw materials
II. Manufacturing process
III. Conclusion
I. Raw materials
• The solvents
– various low viscosity, volatile liquids
– include petroleum mineral spirits
and aromatic solvents such as benzol, alcohols, esters, ketones, and acetone
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I. Raw materials
II. Manufacturing process
III. Conclusion
I. Raw materials• The resins
– natural resins > lin-seed, coconut, and soybean oil
– synthetic resins > alkyds, acrylics, epoxies, and polyurethanes
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I. Raw materials
II. Manufacturing process
III. Conclusion
I. Raw materials• The additives
– many purposes– calcium carbonate and aluminum
silicate > fillers that give the paint body and substance without changing its properties
– Other additives produce certain desired characteristics
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I. Raw materials
II. Manufacturing process
III. Conclusion
II. The manufacturing process
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I. Raw materials
II. Manufacturing process
III. Conclusion
II. The manufacturing process
1) Making the paste
• Premix of the pigment with resin, solvents and additives
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I. Raw materials
II. Manufacturing process
III. Conclusion
II. The manufacturing process
2) Dispersing the pigment
• mixture for most industrial and some consumer paints:
– transportation into a sand mill– filtration
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I. Raw materials
II. Manufacturing process
III. Conclusion
II. The manufacturing process• For 90% of the water-based
latex paints designed for use by individual homeowners:
– high-speed dispersion by a tank
– high-speed agitation by a circular
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I. Raw materials
II. Manufacturing process
III. Conclusion
II. The manufacturing process
3) Thinning the paste
• Transfer to large kettles
• Bustle with the proper amount of solvent
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I. Raw materials
II. Manufacturing process
III. Conclusion
II. The manufacturing process
4) Quality control
• Inspection to a finished paint for its density, dispersion, and viscosity
• Study for bleed resistance, rate of drying, and texture
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I. Raw materials
II. Manufacturing process
III. Conclusion
II. The manufacturing process• The different tests:
– color– resistance of the color to
fading– paint hiding power– gloss
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I. Raw materials
II. Manufacturing process
III. Conclusion
II. The manufacturing process
–mar resistance– adhesion– scrubbability– weathering– fire retardancy
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I. Raw materials
II. Manufacturing process
III. Conclusion
II. The manufacturing process
5) Canning the paint
• empty cans are rolled horizontally onto labels
• lids are placed onto the filled cans
• the lids are sealed• the handles are cut and shaped
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I. Raw materials
II. Manufacturing process
III. Conclusion
II. The manufacturing process
6) Packaging and dispatching
• Cans (usually four) are boxed and stacked before being sent to the warehouse
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I. Raw materials
II. Manufacturing process
III. Conclusion
III. Conclusion
• A process rather polluting so paint manufacturers treat their waste or recycle them.
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Thank you for your attention
Does anyone have any questions?