Inspection report of Vietnam Engineered multilayer solid wood composite flooring 

Inspection report of Vietnam Engineered multilayer solid wood composite flooring

Entrusted by the US floor importer customer, our Vietnamese quality inspection team conducted quality inspection on the floor produced by its supplier last month. (according to the confidentiality agreement, we cannot disclose any contact and company information of customers and their suppliers.)

When importing and purchasing flooring, we usually ask businesses to show the test report of the flooring, because we want to know whether the indicators of the flooring are qualified. Besides looking at the data, do we understand the names and meanings of these projects? In other words, do you understand the test report of solid wood multilayer composite floor?

1. Static bending strength of floor, technical requirements ≥ 30MPa

The static bending strength is the ratio of the bending moment to the flexural section modulus of the specimen under the maximum load. Take wood-based panel as an example. When the wood-based panel is stressed, it will cause a certain bending. This situation is called “static bending”. The “static bending strength” is the pressure strength that the wood-based panel can bear when it is bent to fracture, which is expressed in MPa. The index of static bending strength is applicable to solid wood composite floor, which has the following two meanings:

(1) A solid wood composite floor itself has the ability to resist bending damage.

(2) The ability of the joint of tenon and groove between two solid wood composite floors to resist bending failure.

For the above two points, the higher the index value of “static bending strength”, the stronger its ability to resist bending failure.

2. Floor moisture content, technical requirements: 6% – 14%

Floor moisture content refers to the moisture contained in the floor material. Whether it is solid wood floor, solid wood composite floor or laminate floor, as long as the wood floor made of natural materials contains a certain amount of moisture. After the production of wood products, the shape and material will not change. At this time, the key factors determining the internal quality of wood products are mainly the moisture content and drying stress of floor materials. When wood products reach the equilibrium moisture content when used, the floor material at this time is the least likely to crack and deform. The moisture content of the floor is generally 12% to 14%. If the moisture content is too low, the expansion gap is not enough during decoration, and the climate is humid, the floor will arch and tilt back when it is damp. If the moisture content of the floor is too high, after decoration, affected by the dry climate, the moisture in the floor dries up and shrinks, and there will be cracks between the floors. According to the moisture content of the floor, the decoration workers can appropriately relax or narrow the expansion joints between the floor and the wall, and between the floor and the floor. If the decoration quality is not good, it will aggravate the arching or seam of the floor. This is also a point where there are many after-sales problems. We need to pay attention not only in the decoration process, but also in the later use to avoid soaking in water or exposure to the sun, because these will directly affect the moisture content of the floor, and the above problems will occur when the moisture content changes.

3. The floor surface is wear-resistant, and the technical requirements are ≥ 2000 (only limited to solid wood composite floor)

The wear-resistant degree of wood floor surface is the index of strengthening performance of wood floor surface, which is more used for strengthening floor, but now solid wood composite floor, especially the new three-layer solid wood floor with diamond surface, is also applicable. The wear-resistant layer of wood floor is made of aluminum oxide metal material, commonly known as “wear-resistant paper”, which is a relatively transparent material. It looks similar to plastic film on the surface. The thicker the wear-resistant paper, the higher the wear-resistant revolution.

The national standard stipulates that the standard of laminate floor is: household level II is greater than or equal to 4000 revolutions, household level 1 is greater than or equal to 6000 revolutions, and commercial level is more than 9000 revolutions. What we illustrate here is the solid wood composite floor. The standard is greater than or equal to 2000 revolutions. The requirements will be different for different products. Because the thicker the wear-resistant paper of the floor, the worse the transparency of the floor surface, which will directly affect the decorative effect of the floor. At the same time, it also increases the material cost, the floor will be brittle, the more expensive the product price, and also affect the comfort. Therefore, the number of wear-resistant revolutions should be considered when buying the floor, but we can’t blindly seek “high”.

4. Formaldehyde emission from floor, technical requirements ≤ 0.124

Formaldehyde is a kind of chemical gas. If the content of formaldehyde in the air reaches a certain concentration, it will do harm to human body. It is mainly used in the manufacturing process of composite materials and plays a bonding role. In this way, the formaldehyde contained in building materials will not volatilize immediately, but volatilize slowly due to different temperature and humidity conditions, and the volatilization time is more than ten years. Living in an environment with excessive formaldehyde concentration for a long time, formaldehyde will cause obvious damage to people’s eyes, nose and respiratory system or cause people to suffer from skin diseases.

Formaldehyde emission is an important indicator of modern decorated houses. The standard of green building materials stipulated by the international environmental protection organization is not higher than 8mg / 100g, so it should be lower than this standard as far as possible. Environmental standard: the allowable formaldehyde emission standard of artificial board is 0.20mg/m3.

According to the national indoor formaldehyde emission content standard, the formaldehyde content of the floor must reach E1 level, that is, it cannot be higher than 1.5mg/l, because the formaldehyde content released within this range is not harmful to human health. So what type of floor formaldehyde content is relatively small?

This kind of solid wood composite floor is mainly composed of multi-layer boards through adhesives, and the surface is pasted with wood veneers with various patterns. Because there are more adhesives added, but the surface is pasted, the formaldehyde emission is relatively small, generally not more than 0.3 mg.

The above four points are the interpretation of the test report of solid wood composite flooring, and the indicators have made a detailed description, hoping to help you avoid entering the pit when purchasing wood flooring. In the next issue, we will introduce some indicators of the laminate test report. If you want to know, you can pay attention to it first.

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