What Is Plywood?
Considering all the building materials, Plywood has become one of the most eye-catching materials in the woodworking industry. Nowadays, because of the beneficial properties of plywood, they have become much more needed building materials than traditional materials such as natural wood, brick, plastic, etc.
Plywood is an amazing combination of light, strength, and flexibility. This is the main reason why the growth of the Plywood market is increasing day by day around the world.
Compared to wood, plywood is more readily and easily available in all regions. Due to the scarcity and cost of wood, Plywood has made its way to the construction industry in the last few decades ago.
Therefore, plywood is a versatile material. The cost of plywood varies depending on the structure and purpose. For a typical indoor workplace, one can use ordinary Plywood and for a specific purpose such as water resistance, use a standard waterproof Plywood that will have a higher cost compared to the regular one.
Now a day’s different grades of Plywood are available in the market, and one has to choose the right grade depending on his needs and work requirement.
Uses of Plywood
- The uses of Plywood in the building and construction industries as well as the interior design have made it a world-famous building material.
- As the benefits of plywood are enormous, many companies around the world have begun producing soft, sturdy, thermal, and decorative Plywood.
Different types of Plywood have different uses.
- From furniture making to house building including building frame, door production, windows, drywall/partition, decorative materials, etc. Plywood is used.
- Many other sheets or composite panels are available in the market, but nevertheless, a professional or woodworker prefers Plywood because of its properties such as strength and stability, ease of operation, cost, etc.
What Is Plywood Used For?
- Plywood is very economical when used in construction projects such as floors, walls, partitions, forms, cabinets, shelves, etc. Because of its high strength and stability.
- Plywood is useful when using as flooring or concrete structure.
- Plywood is suitable for use as gussets for portal frames and as reinforcing panels and webs for columns made of a wooden structure.
- As Plywood is resistant to water and chemicals, it is therefore very popular in the chemical industry.
- Flexibility to the size and shape of the plywood makes it an ideal material in terms of wood. Such flexible plywood is especially useful for building furniture that is expected to have curved areas.
- Flexibility of plywood enables it for roof and paneling work, curved formwork, etc.
- In western countries, due to the need for high-temperature resistance, insulated plywood is preferred for installation as flooring, roofing, and wall cladding work.
What Is Plywood Made of?
- Plywood is a type of engineering wood which is made by stacking several layers of wood veneers (thin slices of natural wood).
- A piece of Plywood is made up of tiny layers or “plies” of wood veneer that are joined or glued together and the adjacent layers having their wooden grains rotated up to 90 degrees from each other. According to basic terms, plywood is made by gluing wooden joints together to form a flat sheet.
- Pieces of plywood are formed differently depending on their intended use. For example, if plywood is to be used for construction purposes, it is pressed into large flat sheets.
- If plywood is intended for use in aircraft or in boat construction or furniture, it is formed into curves. Every layer of plywood has its grains running in right angles. This helps to keep the layer firm and durable while also limits any chance of shrinkage. The plywood itself is made up of at least three layers of wood that are held together by glue.
- The two outer areas of the plywood are called the back and the face. The back itself is hidden from the view while the face is one that can be seen. The inner layer is known as the backbone and if five or more piles are used, additional inner layers are considered as cross bands.
What is Plywood Made From?
The production of plywood requires a fine piece of log, called a peeler, which is usually straight and larger in size than the one needed to process the timbers with a sawmill. The log is placed horizontally and rotated in relation to its long axis while the long navel is pressed against it, resulting in a thin layer of wood (like a continuous roll of paper).
A flexible nozzle, which can be tightened or a roller, is pressed into the log during the rotation, creating a “gap” for the veneer to pass between the knife and the nose bar. The nose bar partly compresses the wood as it is stripped; controls the vibration of the flip knife, and helps to keep the veneer peeled to a precise thickness.
In this way the log is filtered into veneer sheets, which are then cut to the desired size, allowing it to shrink (depending on the type of wood) when dried. The sheets are then marked, divided, glued together, and baked in press at a temperature of at least 140 ° C (284 ° F), and at pressures of up to 1.9 MPa (280 psi) (but more often 200 psi) to form a plywood panel.
The plywood panel may have minor defects such as cracks or small knot holes which are filled, remodeled, sanded, or otherwise refinished, depending on the intended market.
Properties of Plywood
- Plywood is used by experts nowadays due to its unique properties like.
- Plywood have high strength and stability.
- Plywood have high resistance to impact.
- Plywood have resistance to fire, water, heat, and chemicals.
- Plywood have flexibility in size, shape, and thickness which makes it fit for every requirement.
- Plywood do not show any swelling, shrinking, and wrapping properties.
- Plywood are more durable than natural wood.
- Plywood are more cost-effective than natural wood.
- Plywood are environment friendly and minimize wastage of wood.
Characteristics of Plywood
- Plywood is a laminate, with several layers of wood and shavings placed on top of each other and glued together. The strength of the laminate is enhanced by the arrangement of each layer so the wood grain is alternated, making most types of plywood stronger than the same piece of real wood. Plywood is also almost twice as resistant to sheering as ordinary wood.
- Plywood is made of wood chips and shaving so wood chips can come from parts of trees that are not suitable for milling of beams, blocks, and boards. As a rule, that makes plywood cheaper than its equivalent to real wood, especially for larger-scale applications.
- The alternating grains and the use of adhesive make plywood stronger and more stable than conventional wood. Plywood sometimes does not like to absorb and/or emit moisture, and when it does, the alternating grain pattern resists an increase and decrease in size due to shrinkage. As a result, wood sometimes withstands shrinkage and warping.
- Plywood is a manufactured product so it is not limited in the same way real wood is in the size, shape, and appearance given by nature. Plywood sheets come in a variety of sizes and thicknesses as noted earlier and have a wide variety of surfaces. Plywood with a smooth veneer can be finished with many of the same finishing products used on real wood.
What Can Plywood Be Used for?
- Plywood is suitable for the floor of various buildings, including the heavy wear industry.
- In order to gain resistance to water and chemicals, the Plywood is treated with waterproof glue and other chemicals. This is known as Marine plywood.
- Marine plywood makes it ideal for furniture, concrete formwork, and garden furniture projects such as tables, chairs, benches, decorations, rugs, arbors, pergolas, planters, etc. However, it can be noted that all plywoods are not water-resistant.
- Plywood can also be used in making furniture, decorative items, etc.
- Plywood is suitable for use as fire-resistant materials.
Strength of Plywood
- The Tensile strength of plywood is 27.6 to 34.5 Mpa.
- The Compressive strength of plywood is 31.0 to 41.4 Mpa.
- The Modulus of rupture of plywood is 0.0383 to 0.0689 Gpa.
- The Flexural modulus of plywood is 8.20 to 10.3 Gpa.
- The Shear modulus of plywood is 0.138 to 0.207 Gpa in-plane and 0.586 to 0.758 Gpa through-thickness.
- The Shear strength of plywood is 1.72 to 2.07 Mpa in-plane and 5.52 to 6.89 Mpa through-thickness.
Applications of Plywood:
Plywood applications are as follows.
- Plywood has many applications depending upon the nature of construction work.
- Plywood is used as Floors, walls, and roofs in home constructions.
- Plywood is used as wind bracing panels.
- Plywood is used as the vehicle’s internal bodywork.
- Plywood is used in packages and boxes
- Plywood is used as Fencing around houses.
- Plywood is used in concrete shuttering panels.
- Plywood is used as ready to paint surfaces for constructions
- Plywood is used as panels in concrete formwork systems.
- Plywood is used as floors, walls, and roofs in transport vehicles.
- Plywood is used as container floors
- Plywood is used in floors subjected to heavy wear in various buildings and factories.
- Plywood is used as scaffolding materials.
- Plywood is used in making furniture, sports equipment, and musical instruments.
- Plywood is used as a Floor base, Structure panel, and Lamin board.
- Plywood is used in Kitchens and also in wet areas such as Boats.