WOOD
Sebastian Ocampo
WOOD
the hard substance beneath the tree bark
which can be used as building materials
such as:
WOOD
the hard substance beneath the tree bark
which can be used as building materials
such as:
Flakeboard
WOOD
the hard substance beneath the tree bark
which can be used as building materials
such as:
Hardboard
WOOD
the hard substance beneath the tree bark
which can be used as building materials
such as:
Plywood
PLYWOOD
Plywood is made of three or more thin
layers of wood bonded together with glue.
PLYWOOD
Plywood is made of three or more thin
layers of wood bonded together with glue.
The layers are glued together in alternating
directions to:
PLYWOOD
Plywood is made of three or more thin
layers of wood bonded together with glue.
The layers are glued together in alternating
directions to:
- less likely not allow expansion or shrinkage
based on moisture in the environment
PLYWOOD
Plywood is made of three or more thin
layers of wood bonded together with glue.
The layers are glued together in alternating
directions to:
- less likely not allow expansion or shrinkage
based on moisture in the environment
- to create a board that is strong in each
direction
PLYWOOD
Plywood Grades:
Grade A consistent in appearance with
no large variations.
PLYWOOD
Plywood Grades:
Grade B shows grain pattern and is free
from open knots and plugs
PLYWOOD
Plywood Grades:
Grade C & D includes knots, discoloration, and
splits and is suitable where the strength of plwood
is needed but apparance does not matter
PLYWOOD
Different types of plywood:
PLYWOOD
Different types of plywood:
Softwood used for walls, roofs and floors
PLYWOOD
Different types of plywood:
Softwood used for walls, roofs and floors
Hardwood used for laminate flooring,
kitchen units and some furnitures
PLYWOOD
Different types of plywood:
Softwood used for walls, roofs and floors
Hardwood used for laminate flooring,
kitchen units and some furnitures
Marine plywood used for boat hull
construction (water resistant)
HISTORY
1500 B.C. Egyptian craftmens bonded
thin pieces of dark ebony wood
HISTORY
1600s Romans decorated their furniture
with thin pieces of wood
HISTORY
1797 Samuel Bentham described the
concept of making plywood
HISTORY
1890 plywoods were first use to build
doors
HISTORY
1928 plywood sheets were introduced in
the United States for use as a general
building material
MANUFACTURING
PROCESS
Felling the trees Preparing the logs
Making the veneer Forming plywood
sheets
MANUFACTURING PROCESS
Felling the trees
The trees are carefully selected in terms of
species, physical geometry, and quality.
MANUFACTURING PROCESS
Felling the trees
Selected trees in an area are cut down using
gasoline powered chain saws or fellers.
MANUFACTURING PROCESS
Felling the trees
The logs are cut to length and are loaded on
trucks by skidders.
MANUFACTURING PROCESS
Preparing the logs
The logs are transported to log decks and
conditioned by submerging them into pool
of water or spraying it with water.
MANUFACTURING PROCESS
Preparing the logs
The logs are placed on a chain coveyor
delivering them to the debarking machine
which removes the bark with sharp-toothed
grinding wheels
MANUFACTURING PROCESS
Preparing the logs
The debarked logs are cut into sections with
huge circular saws. These log sections are
called peeler blocks.
MANUFACTURING PROCESS
Making the veneer
The peeler blocks are peeled using a rotary
lathe machine producing a long sheet of
veneer.
MANUFACTURING PROCESS
Making the veneer
The long sheet of veneer is cut into usable
width by shearing machine
MANUFACTURING PROCESS
Forming the plywood sheets
The sections of veneer are manually or
automatically sorted and stacked according
to grade.
MANUFACTURING PROCESS
Forming the plywood sheets
The sorted sections are fed into a continuous
dryer to reduce their moisture content
improving bonding.
MANUFACTURING PROCESS
Forming the plywood sheets
The dried veneers are applied with glue by
the glue spreader.
MANUFACTURING PROCESS
Forming the plywood sheets
Sections of veneer are layered and glued to
each other.
MANUFACTURING PROCESS
Forming the plywood sheets
The glued sheets are loaded into hydraulic
presses to bring the veneer into direct
contact with the adhesive.
MANUFACTURING PROCESS
Forming the plywood sheets
The cold pressed sections of veneer are hot-
pressed to cure the glue increasing press
capacity.
MANUFACTURING PROCESS
Forming the plywood sheets
The rough sheets are trimmed to their final
width and length by a set of saws.
MANUFACTURING PROCESS
Forming the plywood sheets
The sheets are sanded as they pass through a
set of belt sanders, which sand both the face
and back.
MANUFACTURING PROCESS
Forming the plywood sheets
The plywood are packed and stacked and
moved to the warehouse.
SUMMARY: MANUFACTURING
PROCESS
Felling the trees Forming the plywood sheets
- Selection - Sorting
- Cutting - Drying
- Transporting - Gluing
- Assembly
Preparing the logs
- Cold-Press
- Conditioning - Hot-Press
- Debarking - Trimming
- Slicing - Sanding
- Packing/Stacking
Making the veneer
- Peeling
- Shearing
WOOD PRODUCTS
FROM HARDWARE
WOOD PRODUCTS
MDF OSB Hardwood Plywood
Hardboard Underlayment
REFERENCES
http://www.madehow.com/Volume-4/Plywood.html
http://www.fao.org/docrep/t0269e/t0269e03.html
http://www.technologystudent.com/joints/plywood1.html
https://www.thespruce.com/what-is-plywood-3536689
http://slideplayer.com/slide/5750062/
https://www.kitronik.co.uk/blog/plywood-grading-resource/
https://en.wikipedia.org/wiki/Structural_material
http://www.lampertlumber.com/hardware-store-
products/lumber/types-of-lumber/
THANK YOU
