Film-coated plywood, film-coated coppha or film-coated coppha is an industrial plywood made by hot pressing layers of wood together with a high-grade water-resistant and moisture-resistant glue (usually WBP glue or MR). Film-coated formwork is also coated on the outside of the Film layer, which is waterproof, and creates a smooth, shiny, capable of reducing scratches as well as protecting the board during installation and construction.
FILM COPPHA COVER – QUALITY KEY FACTORS
Film-based COPPHA COVER
Film-coated coppha plywood is a very important component, it is the main factor determining whether the film-coated coppha board can withstand water during formwork in construction or not. Usually we have 2 main types of plywood glue:
WBP (Water Boiled Proof): Plywood glue with WATER-RESISTANT properties.
Film-coated coppha plywood using WBP glue can be used outdoors, even in humid environments without worry of layering.
WBP is the English name that means waterproof glue, not the proper name for the glue. Adhesives with water resistance properties can all be referred to collectively as WBP adhesives.
Common types of WBP glue plywood:
- WBP – Phenolic
- WBP – Melamine universal
- WBP – Good Melamine
MR (Moisture Resistant): Coppha plywood glue has moisture Resistant properties.
Like the WBP, MR is not the name of the glue but the English language’s moisture resistance. All types of glue with resistance to moisture can be called MR glue.
MR glue plywood is only suitable for use in environments with limited water exposure, less moisture, and often for indoor building applications. Film-coated coppha plywood using MR glue is only capable of maximizing boiling for 30-40 minutes, often less commonly used as formwork in construction.
The film is a water-resistant Phenolic laminate paper film, which helps to create smoothness, reduce scratches as well as protect the board during construction and use.
Type of wood: the types of wood used for film-coated coppha plywood are usually: Eucalyptus, Pine, Hardwood, Polar, Birch and Combi. rubber
– Poplar: is a colorless poplar or white / light yellow color, relatively high plasticity, is grown and grows very quickly with extremely low cost.
– Hardwood: This is a hardwood or broad canopy wood, this wood has a high density, often used for floor wood and high-grade furniture in the house.
– Birch: is birch wood, has a slight aroma, high density of wood, very straight wood grain and is usually light yellow or dark brown. This type of Bulo wood is also commonly used for flooring or high quality furniture.
– Combi: is a type of wood combined with two or more types of wood.
Classification of plank gut by quality: there are 7 types in descending order of quality AA, A +, A, B +, B, C + and C
High quality AA grade coppha board
Plywood core is hot pressed at least 3-5 times.
Flat surface, extremely flat.
Small thickness tolerance, completely negligible.
Common AA coppha core used for film coated formwork is of high quality and also very expensive.
Coppha type A + core
Plywood core is hot pressed about 2-4 times.
Absolutely flat plywood surface.
Thickness tolerance is very small, negligible.
Type A + core is often used for high to very high quality film coated plywood.
Coppha type A board
Wood surface quality is universal, fair.
The plywood is usually hot pressed 2-3 times.
The surface of the board is flat and smooth.
Small, low thickness tolerance.
Type A coppha board is used for high quality film coated coppha board. Most European countries, USA, UK or Canada require A quality plywood gut.
Coppha type B + gut
The plywood is usually hot pressed 2-3 times.
The surface of the board is quite flat.
Small thickness tolerance.
Type B + formwork plywood core is used for medium quality, low cost film coated coppha plywood with universal quality.
Coppha type B core
The plywood is only hot pressed 1-2 times.
Flat plank surface.
The thickness tolerance is relatively low.
Type B coppha core is used for medium quality film coated formwork, which is popular due to its low price and acceptable quality.
Coppha type C + board
The medium-low quality veneers are assembled from small veneer sheets.
Plywood core is hot pressed 1-2 times.
The surface of the board is medium and often faulty.
Thickness tolerance is quite high.
Plywood with C + core board is cheap, low quality, only suitable for common plywood, and often used as the back of furniture.
Coppha type C core
Low quality wood surface layer is assembled from small pieces of veneer.
The plywood is only hot pressed once.
The board surface is relatively flat, not really flat.
High thickness tolerance.
Type C core is of low quality, quite low and poor stability.
This type of board has the cheapest price, the quality is also poor, the quality is not guaranteed.
QUALITY INSPECTION METHOD OF FILM COPPHA FILMS:
There are many ways to test and check the quality of film-coated coppha boards. In the simplest sense, we usually use the following manual methods:
Sawing, cutting the plank into many small boards: the stronger the plank, the higher the tightness, the better the quality, if the intestine has many holes in turn, the more likely that the intestine is grafted from many small, quality veneer layers. low plank gut (at grade C + or C).
Boil the board continuously for 3-4 hours: if the coppha board is using the WBP high-quality waterproof glue, it will not be layered and vice versa.
ADVANTAGES OF FILM COPPHA COVER
Absolutely flat surface of the coppha board makes the surface of the concrete floor completely flat after application without any additional mortar.
Light weight, easy and convenient to move, easy to install and construct.
The board is not waterproof, can be reused many times (6-10 times) to help save costs.
The above is a full article introducing basic information about coppha plywood, film coated coppha plywood. Hope that the readers have gained the necessary knowledge about this plywood after reading the article.
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