plywood project composites ahmedawad
DESCRIPTION
CompositesTRANSCRIPT
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Composites Presented by :Rabha Fathy
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Plywood
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Advantages of Plywood
Plywood is constructed layers of wood are glued together at the right angles
that is what gives it its strength
where this layering make the plants resistant to warping, cracking and twisting
ideal for use in construction.
It is stronger than a similar thickness of natural wood because the fiber strands are oriented to form a cross pattern.
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Disadvantages of plywood
plywood has lots of splinters on the edges after cutting
The layering effect in plywood makes it porous and susceptible to water damage if exposed over time.
Plywood becomes heavy when wet and should be covered if left outside to reduce the risk of water damage.
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laminate plywood
Lamination plywood may be used for decorations
It also can add durability
water resistance to countertops.
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Safety information
use full eye protection
use a well ventilated area to apply any type of glue or contact cement
disposable gloves
ear plugs
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Method used
Hand lay up process
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Hand lay-up
Used in application that is large is size but not in mass production
Used to make successive layers of resin and reinforcement is applied to open mold to build the laminated composite structure
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Tools used
Glue
Formica
veneer
small roller
sandpaper on a block
contact cement
a brush to clean with
a screwdriver
Clippers
a table saw
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steps
Before the veneer can be cut, the peeler blocks must be heated and soaked to soften the wood.
The blocks may be steamed or immersed in hot water.
This process takes 12-40 hours depending on the type of wood, the diameter of the block
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Steps
Cut the laminate to stipes
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Open the glue
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wipe off any dust from laminate and the plywood.
make sure its clean
coat the bottom of the laminate and the top of the plywood with one coat of contact cement
Wait till the cement is dull and tacky, but not too wet or shiny, it is ready for contact.
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a
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Put the laminate on the plywood
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Pressure roll
Pressure roll is used to make sure that the laminate is sticked to the plywood
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. When all the sheets are loaded, the press squeezes them together under a pressure of about 110-200 psi (7.6-13.8 bar), while at the same time heating them to a temperature of about 230-315° F (109.9-157.2°C).
After a period of 2-7 minutes, the press is opened and the sheets are unloaded
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Route the edges
make sure it keeps a constant distance with the edge to be flush
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Plywood sheets range in thickness from. 06 in (1.6 mm) to 3.0 in (76 mm). The most common thicknesses are in the 0.25 in (6.4 mm) to 0.75 in (19.0 mm) range.
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