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Copha or Coppha film coated is industrial plywood, created by the layers of wood pressed together with glue (usually waterproof glue WBP) and coated with a layer of waterproof film outside, which help create smoothness-shining-glossy,reduce scratches as well as protect the planks during construction and using time.

WBP (Water Boiled Proof): WATER RESISTANT GLUE

Copha film coated with WBP glue can use outdoors and damp environment. It can be exposed to water without being peeled.

WBP is the common English name on the characteristics of waterproof glue, not the name of any glue. All glues waterproof properties are refered to as WBP glue.

The common WBP glues:
+ WBP – Phenolic
+ WBP – Melamine common type
+ WBP – Melamine good kind.

MR (Moisture Resistant): humidity resistant glue
Like WBP, MR is not the proper name of the glue but that is characteristic of the moisture resistant glue. All glues, resisting to moisture are collectively referred to as MR glue.
Plywood film coated with MR glue, being suitable in less humid environment, limit excessive exposure to water and are often used for indoor applications. The plywood film coated with MR glue have a tolerance of boiling water up to 30 minutes, usually less used as copha in construction.
(Note: copha film coated of Quang Minh does not use this type of glue.)

FILM
Film is coat of phenolic glue (waterproof), which help create smoothness-shining-glossy, reduce scratches as well as protect the planks during construction and using time.Dynea film and Stora Enso is the advanced film brand, commonly used for copha advanced film coated products.

The interior of plywood

– Type of wood: Types of wood using make the interior of Coppha film coated usually : Eucalyptus, Polar, Hardwood, Birch and Combi.

– Poplar: timber is pale yellow Ocean or white, high viscosity, are nursery grown and developed rapidly at low cost.

– Hardwood: hard wood or wood is widespread trees (oak, cherry, walnut, …) have high proportions, often used as flooring and high quality furniture.

– Birch: Birch wood, lightly scented, high density, straight grain and is light yellow or brown. This wood is also commonly used as a floor or a high-end furniture.

– Combi: the woods are assembled combination of two or more types of wood

Classify the interior according to the nature: 7 kinds of descending quality AA, A +, A, B +, B, C + and C.

The first type : AA

Veneer plank, high quality. Veneer panels (the face of plank) are linked together by spraying glue and hot pressed.
The interior are hot pressed at least 3 or 4 times.
The surface of plywood is flat, absolutely flat.
Thickness tolerances small, negligible.
The type of AA interior are often used for very high quality plywood film coated of and also very high costs.

Type : A+

Veneer plank, high quality.
The interior are hot pressed 3 or 4 times.
The surface of plywood is absolutely flat.
Thickness tolerances small, negligible.
The type of A+ interior are often used for high quality plywood film coated of and also high costs.

Type : A

Veneer plank, economy quality.
The interior are hot pressed 2 times.
The surface of plywood is flat.
Thickness tolerances small.
The type of interior are often used for high quality plywood film coated.
Most countries in Europe, America or Canada are require this type of interior.

Type : B+

Veneers are assembled from veneer sheets of medium-sized, ordinary quality.
The interior are hot pressed 2 times.
The surface of plywood is flat.
Thickness tolerances small.
The type of interior are often used for medium quality plywood film coated. Most of customer agree to the price of this type with the common quality.

Type B

Veneers are assembled from veneer sheets of mid-sized, ordinary quality.
The interior are hot pressed only 1 time.
The surface of plywood is flat.
Thickness tolerances are relatively low
The plywood with the interior of type B are often used for medium quality plywood film coated. Due to the low and competitive cost as well as the quality can be accepted by major of customer, this type of interior is very popular.

Type : C+

Veneers are assembled from veneer sheets of mid-sized, low quality.
The interior are hot pressed 2 times.
The surface of plywood is relatively flat but it’s often faulty.
Thickness tolerance is quite high.
The price of the plywood with the interior of type C + is cheap, low quality, suitable to ordinary plywood and is often used as the back of the chairs.

Type : C

Veneers are assembled from small and fragmented veneer sheets, low quality.
The interior are hot pressed only 1 time.
The surface of plywood is relatively flat.
Thickness tolerance is high.
The plywood with the interior of type C + is low quality and stability.
The price of the plywood with the interior of type C + is the cheapest, low quality and no guarantee.

COPPHA PLANK- METHODS IN QUALITY CONTROLLING.

There are many ways to test and evaluate the quality of Coppha film coated. To simlify , we often use some manual ways such as:

We saw planks into several small ones: the more solid the interior is , the better the quality is . If the interior of the plank has many voids, It’s mean that veneers are assembled from small veneer sheets, low-quality (type C + or C).

We boil it consecutively at least 4 hours. If it is rolled by waterproof glue (WBP), it would not be peeled and vice versa.

SOME ADVANTAGES OF COPHA FILM COATED

The surface of plywood is absolutely a flat surface ,making concrete floor flat and don’t need to additional mortar.
Lightweight, easy to move or installation and construction.
Plywood is waterproof and can be re-used many times to help save costs.
You can see more of the characteristics and advantages of plywood film coated in this article.

KEEPING AND PRESERVING

STORAGE

The surface of copha film coated must always be cleaned and repaired (if it is scratched or damaged) before storaged in the warehouse. It need to have a dunnage in the underneath and cover above when loading .

Coppha film coated must be placed it’s back in opposite sides in order to avoid scratches and surface damage caused by screws. The damp planks should be separately from the dry one, remember not to dry too quickly these damp planks.

PRESERVING OF THE PLYWOOD

The edges of plywood film coated is often processed and coated Phenolic glue at the plant. This is also an important factor to ensure the edge and corner each plank in the best protection.

To maintain the reliability of the planks, the edges of the plank need recoating by waterproof glue after sawing, cutting.

COVERING ALL THE GAPS

Coppha film coated is waterproof film or moisture resistant plywood, so any gaps of plywood must be sealed in other to protected from water.

Once the water soak into the planks, it can be swelled around the site of the infiltration.

CLEANING AND REPAIRING

To prolong the term of plywood film coated, we need to clean the surface after using. It is best cleaned with water and brush or rake hardwood trees.

(Note): Not to damage the film during the cleaning process.