Community Level Processing

Question 1

• thin slices of wood and sometimes bark, usually thinner than 3mm (1/8 inch), that typically are glued onto core panels to produce flat panels such as doors, tops and panels for cabinets, parquet floors

Answer 1

VENEER

Question 2

• includes all processes from the time the log enters the yard to the time when veneer sheet is packed and ready to be transported

Answer 2

VENEER MANUFACTURE

Question 3

VENEER MANUFACTURING PROCESS:

Answer 3

a. PREPARATION
b. DEBARKING
c. COOKING
d. SLICING/PEELING
e. DRYING
f. QUALITY CHECK
g. SPLICING
h. PACKING

Question 4

• logs are classified by species and stored in the log yard. Further, they are kept under optimal humidity conditions by soaking them in ponds of water or spraying them with water

Answer 4

PREPARATION

Question 5

• the bark is then peeled off while ensuring that evenness is maintained

Answer 5

DEBARKING

Question 6

• in order to ensure uniform slicing, the logs are kept completely submerged in steamers at temperatures of 80 – 100oC for a period of 18 to 72 hours

Answer 6

COOKING

Question 7

• pressure and knife bar settings are set to an accuracy of 0.1mm,one of the two types of veneer slicing machines – a horizontal/vertical slicing machine or a peeling machine – are set in motion

Answer 7

SLICING/PEELING

Question 8

• the veneers which are still moist are dried in a jet drier which also has the effect of flattening them

Answer 8

DRYING

Question 9

• an expert carefully assess the veneers for quality according to strictly quality standards

Answer 9

QUALITY CHECK

Question 10

• veneer matching is undertaken using the application of heat and pressure to ensure consistent match is obtained

Answer 10

SPLICING

Question 11

• is a technique used to connect two pieces of wood end-to-end

Answer 11

Splice

Question 12

• the wood veneers are measured, labelled with indications of length, width, etc., packed with protective polyethylene and readied to be transported

Answer 12

PACKING

Question 13

GLUED-WOOD PRODUCTS & WOOD COMPOSITES:

Answer 13

1. Plywood
2. Particleboard
3. Fiberboard
4. Woodwool Cement Board

Question 14

• an assembled wood product usually made up of two or more layers of veneers held together by adhesives

Answer 14

Plywood

Question 15

• a product made up of small particles of wood and/or fibrous agricultural materials bonded together with synthetic resin and cured under heat and
• a generic term for panel manufactures from ligno-cellulosic material combined with a synthetic resin or other suitable binder and bonded together under heat and pressure in a hot press

Answer 15

Particleboard

Question 16

Types of Particleboard Density (PHILSA):

Answer 16

a. Low density particleboard – 400 – 600 kg/m3
b. Medium density particleboard – 640 – 800 kg/m3
c. High density particleboard – 880 – 1000 kg/m3
d. Extra-high density particleboard - >1,100 kg/m3

Question 17

• sheets of varied densities, made from refined wood fibers or other ligno-cellulosic materials with the primary bond deriving from the arrangement of fibers and their inherent adhesive properties

Answer 17

Fiberboard

Question 18

• a panel product made of either shredded wood, flakes/strands/splinters or particles of wood or agricultural residues bonded with ordinary portland cement with some mineral additives & cold pressed under low pressure & ambient temperature and resistant to fungus and termite attack

Answer 18

Woodwool Cement Board

Question 19

• an assembled wood product usually made up of two or more layers of veneer held together by adhesives, where the grains of adjacent layers are perpendicular to each other

Answer 19

PLYWOOD

Question 20

COMPONENTS OF PLYWOOD:

Answer 20

a. FACE VENEER
b. CORE VENEER
c. BACK VENEER

Question 21

• usually the most beautiful and smooth side of plywood

Answer 21

FACE VENEER

Question 22

• the veneer placed at the inner portions of plywood

Answer 22

CORE VENEER

Question 23

• lower grade veneer placed at the back of plywood and is the rough side of the plywood

Answer 23

BACK VENEER

Question 24

CLASSIFICATION OF PLYWOOD:

Answer 24

A. PHYSICAL CONSTRUCTION
B. TYPE OF GLUE-BOND

Question 25

PHYSICAL CONSTRUCTION:

Answer 25

1. All veneer plywood
2. Battenboard
3. Blockboard core plywood
4. Comply

Question 26

– consists of odd numbered sheets of veneers

Answer 26

All veneer plywood

Question 27

– pieces of lumber, 2” – 3” thick are used as core veneers

Answer 27

Battenboard

Question 28

– lumber trimmings, less than 1” thick used as core veneers

Answer 28

Blockboard core plywood

Question 29

– veneer faces and a core consists of particleboard or hardboard

Answer 29

Comply

Question 30

TYPE OF GLUE-BOND:

Answer 30

1. Type I (Exterior)
2. Type II (Interior)

Question 31

• uses phenol formaldehyde resin adhesives
• plywood intended for permanent exterior use
• the bond should withstand all weather and water exposures

Answer 31

Type I (Exterior)

Question 32

• uses urea formaldehyde resin adhesive
• bond strength should be maintained when occasionally subjected to thorough wetting and drying conditions

Answer 32

Type II (Interior)