Plywood is made of wood peeling into veneer and then adhesive glue made of three or more layers of plate-like material, usually with odd-numbered veneer, and the adjacent layer of the fiber from the vertical direction of the glue from each other.
Plywood is one of the common materials for furniture, one of the three panels of man-made board, but also for aircraft, ships, trains, cars, construction and packaging materials. A group of veneers are usually made in the direction of the adjacent layers in the direction of the adjacent layers. Generally, the panels and the inner panels are arranged symmetrically on either side of the center layer or the core. With the veneer after the wood by the direction of the criss-cross the composition of the slab, heated or not heated under the conditions of suppression. The number of layers is generally odd, and there are even few. Vertical and horizontal direction of the physical and mechanical properties of small differences. Commonly used plywood types are plywood, penta and so on. Plywood can improve timber utilization and is a major way to save wood.
The general length and width specifications are: 1220 × 2440mm, while the thickness specifications are generally: 3mm, 5mm, 9mm, 12mm, 15mm, 18mm and so on. The main tree species are: birch, willow, poplar, eucalyptus and so on.
The basic principle
In order to improve the characteristics of natural wood anisotropy, so that the characteristics of plywood uniformity, shape stability, the general plywood in the structure must comply with two basic principles: First, symmetry; Second, adjacent layers of single-board fiber perpendicular to each other. The principle of symmetry is to require plywood symmetry on both sides of the plane of the board, regardless of the nature of wood, veneer thickness, layer, fiber direction, moisture content, etc., should be symmetrical. In the same plywood, you can use a single tree and the thickness of the veneer, you can also use different tree species and thickness of the veneer; but symmetrical center plane on both sides of any two layers of symmetrical veneer species and thickness to be the same. The face plate is not allowed to be the same species.
To make the structure of the plywood at the same time meet the above two basic principles, its layer should be odd. So the plywood are usually made three, five, seven and other odd number of layers. The name of each layer of the plywood is: the surface of the board is called the table, the inner board is called the core board; the front panel is called the panel, the back of the table is called the back plate; the core, the fiber direction and the table parallel Called long core plate or medium plate. When forming a slab plate, the panel and the backplate must face outwardly.
In order to make full use of forest resources to develop plywood production, make the best use of our country's newly developed national standards (draft approval) according to the use of adhesive pull, the plywood is divided into decorative plywood (for the surface needs to paint transparent paint Furniture, sewing machines and all kinds of electrical appliances and other products), decorative plywood (for construction, furniture, vehicles and ship decoration materials), the general use of plywood (for packaging, bedding and other uses) and soft wood decoration Plywood (used for construction, furniture, vehicles, ships and other high-level decorative materials), plywood type according to the bonding strength is divided into:
(1) Class I (NQF) - weather resistant, resistant to boiling plywood. This class
Plywood with durable, resistant to boiling or steam treatment and other properties, can be used in the outdoors.
(2) Class II (Ns) - Water resistant plywood.
It can withstand cold water or short-term hot water immersion, but not resistant to boiling.
(3) Class III (Nc) - tide resistant plywood.
1) Decorative veneer veneer plywood is made of natural wood decorative veneer affixed to the plywood made of wood-based panels. Decorative veneer is made of high quality wood by slicing or peeling processing made of thin wood chips.
2) decorative veneer veneer characteristics:
Decorative veneer veneer plywood is one of the most commonly used materials for interior decoration. As the product surface of the decorative veneer is made of high quality wood by slicing or peeling processing method, so the plywood has a better decorative performance. The product is natural and rustic, natural and noble, you can create a person with the best affinity and elegant living room environment.
3) Decorative veneer veneer type:
Decorative veneer veneer plywood according to the decorative surface can be divided into single-sided veneer veneer plywood and double-sided veneer veneer plywood; according to water resistance can be divided into class I decorative veneer veneer plywood, Veneer plywood and class III decorative veneer veneer plywood; according to the decorative veneer texture can be divided into radial decorative veneer veneer plywood chord decorative veneer veneer plywood. Common is a single-sided veneer veneer plywood. Decorative veneer commonly used species of birch, Ash, oak, water green Kong, elm, maple wood, walnut and so on.
4) decorative veneer veneer plywood classification:
China veneer veneer veneer plywood standard veneer veneer plywood is divided into excellent products, first-class goods and qualified three grades. To remind manufacturers and other forms of consumer do not meet the requirements of China's decorative veneer veneer plywood standards, for example, some manufacturers logo level "AAA", which is corporate behavior.
5) national standards for decorative veneer veneer plywood performance requirements: China is the recommended standard GB / T 15104-94 "decorative veneer veneer board", the vast majority of enterprises to implement the implementation of this standard. The standard of the decorative veneer veneer plywood in the appearance of quality, processing accuracy, physical and mechanical properties of the three aspects of the indicators. Its physical and mechanical performance indicators are: moisture content, surface bonding strength, impregnation stripping. GB 18580-2001 "interior decoration materials, wood-based panel and its products in the formaldehyde emission limit" also provides the product of formaldehyde emission limit.
① national standards for veneer veneer veneer moisture content index of 6% to 14%.
② surface bonding strength reflects the decorative veneer layer and the plywood between the bonding strength. National standards that the indicators should be ≥ 50MPa, and the number of standard test pieces ≥ 80%. If the index is not qualified, indicating that the decorative veneer and the substrate plywood of the poor quality of bonding, in use may cause the decorative veneer layer opening.
③ impregnated peeling is reflected in the veneer veneer plywood veneer gluing performance. The failure of the indicators that the quality of the poor quality of the plate, in use may cause open plastic.
④ formaldehyde release limit. The indicator is China's January 1, 2002 from the implementation of the mandatory national standards, which is related products, "Zhunsheng Zheng", from January 1, 2002 can not reach this standard products are not allowed to produce; Is also related products, "market access card", from July 1, 2002 can not reach this standard products are not allowed to enter the market circulation. Formaldehyde limit will affect the health of consumers. Standard requirements of decorative veneer veneer plywood formaldehyde emission should be: E1 level ≤ 1.5mg / L, E2 ≤ 5.0mg / L.
In the production of plywood, derived from a lot of color varieties, one of the most important one is in the original plywood board surface affixed with a thin layer of decorative veneer, known as decorative veneer veneer plywood, the market referred to as decoration Board or trim panel.
It is noteworthy that the common decorative panels are divided into natural wood veneer panels and artificial veneer panels. Natural wood veneer is made of precious natural wood, veneer or cut by the processing of veneer veneer. Artificial veneer is the use of relatively low prices of raw wood peeling made of veneer, made by a certain process pressure made of wood, and then cut into a beautiful pattern decorated veneer.
Usually natural wood veneer decorative panels are decorated with veneer board is often good pattern, high price of trees, such as cedar, oak, rosewood, ash and so on. But should be described in the name of the product, such as "cedar veneer plywood", or "fir slices plywood", or "cherry wood trim". Several kinds of said in the "veneer", "slices", "veneer" are reflected in the "plaque" the basic characteristics. But can not be cedar plywood, ash willow plywood and other abbreviations, because these referred to as refers to the plywood panel, the floor by the cedar or Ash made. Another problem is the growing number of furniture produced in the panel, although the furniture, such as "cedar" and other grain appearance, but the overall furniture, wood is made of other wood, and now the store will be the furniture as "
Choose a point
1) According to the nature of the project, the use of parts, environmental conditions and other factors use different types, grades, materials, decoration and format plywood.
2) decoration should be selected with precious wood sliced veneer veneer plywood.
3) The interior of the building with plywood, should be consistent with GB50222 "building interior decoration design fire safety regulations" requirement.
4) may be damp the hidden parts and high demand for waterproof occasions should consider the use of Class I or II plywood, outdoor use of plywood should be used Ⅰ class plywood.
5) panel decoration need to use transparent varnish (also known as oil), to retain the natural color of wood surface and texture, should focus on the panel material, pattern and color selection; if you do not consider the panel pattern and color, should also be based on the environment and reasonable cost Selection of plywood grade, category.
1, usually made of standard size flat rectangular building materials (such as plywood, metal plate, concrete slab, plastic plate), as a wall, ceiling or floor components.
2, thick blank board.
3, forging, rolling or casting made of metal plate.
4, the plate are: Daxin board density board decorative panels three PCT board five PCT board nine PCT board 12 PCT board waterproof board gypsum board cement board Mianqi board paint board (Reference: Jiangsu SENSO Building Materials Co., Ltd.)
The logs are made of logs and the material of the square. Width of more than three times the thickness of the "plate"; width less than three times the thickness of the rectangular wood called "square material." Is a furniture manufacturing, civil engineering and other commonly used materials.
A group of boards that are usually glued to each other in the direction of the adjacent layers of wood. The panels and inner plates are usually arranged symmetrically on either side of the center or plate.
Sliced plywood long grained plywood Brackets are parallel or close to the plywood parallel to the long side of the board.
Striped plywood Cross grained plywood The veneer is close to or parallel to the plywood parallel to the short side of the board.
Plywood for general use Plywood for general purpose.
Special plywood special plywood for special purpose plywood.
Outdoor plywood eltetior plywood with weather resistance, water resistance and high humidity of the plastic plate.
Plywood Plywood, this type of plywood with durable, resistant to boiling or steam treatment and other properties, can be used in the outdoors.
5.1.6 Indoor plywood board plywood does not have long-term experience of immersion or excessive temperature of the adhesive properties of the glued rice.
22.214.171.124 2-type plywood type 2 plywood Water-resistant plywood, which can be immersed in cold water, or subjected to short-term hot water immersion, but not boiled.
126.96.36.199 3 plywood type 3 plywood Tide resistant plywood, this type of plywood can withstand short-term cold water immersion, suitable for indoor use.
188.8.131.52 4 plywood type 4 plywood tide plywood, this type of plywood in the indoor normal use, with a certain degree of bonding strength.
5.1.7 plywood plywood with limited mechanical properties.
5.1.8 star combination plywood star plywood veneer plywood made of star-shaped billet.
5.2 plywood plywood with core.
5.2.1 Blockboard boardboard board board composed of wood, wood can be between the adhesive, but also not glue.
5.2.2 Cellular board The board core consists of a honeycomb structure, and at least two sides of the core are usually veneers of vertical arrangement.
5.3 Composite plywood The composite core is composed of material other than solid wood or veneer. On both sides of the core is usually at least two veneers of vertical arrangement.
Decorative plywood Two plywood or one of them is a decorative veneer.
A non - planar plywood that is press molded in a stamper.
Add two or more plywood with a bevel to increase the size of the sheet.
5.7 finger joint plywood finger jointed plywood by two or more of the plywood, using the edge of the staggered staggered combination method to increase the size of the plywood.
The length of the board in the grain direction.
The width of the panel is perpendicular to the very long dimension.
5.10 thickness of plywood panel.
Jiangsu Senso Building Materials Co.,Ltd. (SENSO) is one of largest manufacturer of plywood and related products in China, which was founded in 1995 with 6 subsidiaries. We are now enjoying 62 production lines of film faced plywood ,commercial plywood and LVL.......More information