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 NUR ISFARINA BINTI ISMAIL
 MUHAMAD BASRI BIN MD DAUD
 MOHD FAZLI BIN ABU HASAN
 SADAM BIN KAHAR
 MUHAMAD HAFIZ BIN MD SAAD
 Plywood is panel product of peeled veneer layers glued together so that the grain direction
of some wood veneers run perpendicular to and others parallel to the long axis of the panel
 Plywood also claims a high versatility of end uses. Its relatively simple to manufacture and
has many advantages over other wood converted products as well as some steel and
sheet metal applications
 Uneven number of veneer is often used (e.g. 3, 5, 7) *a symmetry makes the board less
prone to warping.
 Two outer veneers are called the face and back veneers and the middle veneer called the
core veneer
1. Interior Plywood
 The interior plywood is used for construction that is carried out inside
a house. These plywood are not meant for external use, as they
cannot stand excess moisture.
2. Exterior Plywood
 The exterior plywood is glued together with a gluing material that can
withstand moisture. Thus, it is used for constructions carried out
outdoors or areas of little moisture.
3. Structural Plywood
 These are extra strong plywood's that are glued together with an
adhesive that holds the layers firmly. The structural plywood can be
used for internal or external purposes. These are basically not meant
to be seen and are mostly hidden behind other constructions.
4. Marine Plywood
 The marine plywood is fabricated with a superior glue that is bonded
tightly and resistant to water. It is the strongest, toughest and highest
grade plywood.
LOG STORAGE
LOG
DEBARKING
AND BUCKING
LOG HEATING
(STEAMING
AND SOAKING)
VENEER
DRYING
VENEER
CUTTING
VENEER LAY
UP AND GLUE
SPREADING
PLYWOOD
PRESSING
PLYWOOD
CUTTING
PLYWOOD
FINISHING
FINISHED
PRODUCT
 Timber in log form - In general criteria
relates to log size, quality and grades, log
transport and handling requirements, and
log protection and quarantine
 The purpose of this operation is to remove the
outer bark of the tree without substantially
damaging the wood
 After the bark is removed, the logs are cut to
appropriate lengths in a step known as bucking
 The logs (now referred to as blocks) then are heated to improve the cutting
action of the veneer lathe or slicer - thereby generating a product from the
lathe or slicer with better surface finish
 Blocks are heated to around 93°C (200°F) using a variety of methods--hot
water baths, steam heat, hot water spray, or a combination of the three
 The veneer log is temporally softened making it more plastic, pliable
and more readily peeled and the quality and quantity of veneer
recovered from heated logs is greater.
 After heating, the logs are processed to
generate veneer
 There are two method to produce veneer
1. Slicing
2. Peeling (Rotary cutting)
 Slicing produce more decorative veneer than
peeling method.
 Decorative hardwood veneers are usually
sliced much thinner than 3 mm (1/8 in.) thick.
 Veneers are taken from the clipper to a veneer dryer where
they are dried to moisture contents that range from around 1
to 15 percent.
 Target moisture content depends on the type of resin used
in subsequent gluing steps. The typical drying temperature
ranges from 150° to 200°C (300° to 400°F)
 Type of veneer drying are:
1. Jet Dryer
2. Microwave
3. High Temperatures Preheaters
4. Ultra-Violet
5. Infra-red
 Assembly of the plywood panels must be
symmetrical on either side of a neutral center
in order to avoid excessive warping.
 Resin is spread on two sides of one ply of
veneer, which is then placed between two
plies of veneer that are not coated with resin
 Type of glue spreading
1. Roller glue spreader
2. Spray coaters
 The laid-up assembly of veneers then is sent
to a hot press in which it is consolidated
under heat and pressure
 There are two type of veneer pressing
1. Pre-pressing
2. Hot pressing
 Typical press temperatures range from 132°
to 165°C (270° to 330°F) for softwood
plywood, and 107° to 135°C (225° to 275°F)
for hardwood plywood.
 The plywood then is taken to a finishing
process where edges are trimmed
 Besides, the plywood will be cut into the size
needed
 The face and back may or may not be
sanded smooth
 The type of finishing depends on the end
product desired
1. High uniform strength
2. Availability of relatively large sizes
3. Economical and effective utilization of figured wood
4. Freedom from shrinking, swelling and warping
5. Non-splitting qualities solid wood splits fairly readily along the grain.
6. Ease of fabrication of curved surfaces
7. The conservation of timber by the elimination of the waste which occurs in
sawing (e.g. sawdust)
1. The layering effect in plywood makes it porous and susceptible to water
damage if exposed over time.
2. Plywood becomes heavy when wet and should be covered if left outside to
reduce the risk of water damage.
3. Plywood has lots of splinters on the edge after cutting.
4. Edges of board are unattractive and can't be covered
5. Not suitable for many joints
6. Still may contain natural defects such as knots due to the sheets of veneer
 Cabinet interiors and
exteriors
 Desk and Table tops
 Kitchen tops
 Doors
 Drawers
 Furniture
 Shelves
 Wall Paneling
 Interior panels
 External cladding
 Plywood sheets – flooring
 Bracing (shearwalls)
THANK YOU..

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Plywood

  • 1. GROUP MEMBER ~  NUR ISFARINA BINTI ISMAIL  MUHAMAD BASRI BIN MD DAUD  MOHD FAZLI BIN ABU HASAN  SADAM BIN KAHAR  MUHAMAD HAFIZ BIN MD SAAD
  • 2.
  • 3.  Plywood is panel product of peeled veneer layers glued together so that the grain direction of some wood veneers run perpendicular to and others parallel to the long axis of the panel  Plywood also claims a high versatility of end uses. Its relatively simple to manufacture and has many advantages over other wood converted products as well as some steel and sheet metal applications  Uneven number of veneer is often used (e.g. 3, 5, 7) *a symmetry makes the board less prone to warping.  Two outer veneers are called the face and back veneers and the middle veneer called the core veneer
  • 4.
  • 5. 1. Interior Plywood  The interior plywood is used for construction that is carried out inside a house. These plywood are not meant for external use, as they cannot stand excess moisture. 2. Exterior Plywood  The exterior plywood is glued together with a gluing material that can withstand moisture. Thus, it is used for constructions carried out outdoors or areas of little moisture. 3. Structural Plywood  These are extra strong plywood's that are glued together with an adhesive that holds the layers firmly. The structural plywood can be used for internal or external purposes. These are basically not meant to be seen and are mostly hidden behind other constructions. 4. Marine Plywood  The marine plywood is fabricated with a superior glue that is bonded tightly and resistant to water. It is the strongest, toughest and highest grade plywood.
  • 6.
  • 7. LOG STORAGE LOG DEBARKING AND BUCKING LOG HEATING (STEAMING AND SOAKING) VENEER DRYING VENEER CUTTING VENEER LAY UP AND GLUE SPREADING PLYWOOD PRESSING PLYWOOD CUTTING PLYWOOD FINISHING FINISHED PRODUCT
  • 8.
  • 9.  Timber in log form - In general criteria relates to log size, quality and grades, log transport and handling requirements, and log protection and quarantine
  • 10.  The purpose of this operation is to remove the outer bark of the tree without substantially damaging the wood  After the bark is removed, the logs are cut to appropriate lengths in a step known as bucking
  • 11.  The logs (now referred to as blocks) then are heated to improve the cutting action of the veneer lathe or slicer - thereby generating a product from the lathe or slicer with better surface finish  Blocks are heated to around 93°C (200°F) using a variety of methods--hot water baths, steam heat, hot water spray, or a combination of the three  The veneer log is temporally softened making it more plastic, pliable and more readily peeled and the quality and quantity of veneer recovered from heated logs is greater.
  • 12.  After heating, the logs are processed to generate veneer  There are two method to produce veneer 1. Slicing 2. Peeling (Rotary cutting)  Slicing produce more decorative veneer than peeling method.  Decorative hardwood veneers are usually sliced much thinner than 3 mm (1/8 in.) thick.
  • 13.  Veneers are taken from the clipper to a veneer dryer where they are dried to moisture contents that range from around 1 to 15 percent.  Target moisture content depends on the type of resin used in subsequent gluing steps. The typical drying temperature ranges from 150° to 200°C (300° to 400°F)  Type of veneer drying are: 1. Jet Dryer 2. Microwave 3. High Temperatures Preheaters 4. Ultra-Violet 5. Infra-red
  • 14.  Assembly of the plywood panels must be symmetrical on either side of a neutral center in order to avoid excessive warping.  Resin is spread on two sides of one ply of veneer, which is then placed between two plies of veneer that are not coated with resin  Type of glue spreading 1. Roller glue spreader 2. Spray coaters
  • 15.  The laid-up assembly of veneers then is sent to a hot press in which it is consolidated under heat and pressure  There are two type of veneer pressing 1. Pre-pressing 2. Hot pressing  Typical press temperatures range from 132° to 165°C (270° to 330°F) for softwood plywood, and 107° to 135°C (225° to 275°F) for hardwood plywood.
  • 16.  The plywood then is taken to a finishing process where edges are trimmed  Besides, the plywood will be cut into the size needed
  • 17.  The face and back may or may not be sanded smooth  The type of finishing depends on the end product desired
  • 18.
  • 19. 1. High uniform strength 2. Availability of relatively large sizes 3. Economical and effective utilization of figured wood 4. Freedom from shrinking, swelling and warping 5. Non-splitting qualities solid wood splits fairly readily along the grain. 6. Ease of fabrication of curved surfaces 7. The conservation of timber by the elimination of the waste which occurs in sawing (e.g. sawdust)
  • 20.
  • 21. 1. The layering effect in plywood makes it porous and susceptible to water damage if exposed over time. 2. Plywood becomes heavy when wet and should be covered if left outside to reduce the risk of water damage. 3. Plywood has lots of splinters on the edge after cutting. 4. Edges of board are unattractive and can't be covered 5. Not suitable for many joints 6. Still may contain natural defects such as knots due to the sheets of veneer
  • 22.
  • 23.  Cabinet interiors and exteriors  Desk and Table tops  Kitchen tops  Doors  Drawers  Furniture  Shelves  Wall Paneling  Interior panels  External cladding  Plywood sheets – flooring  Bracing (shearwalls)