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The quality inspection and inspection of wooden furniture published by the General Administration of Quality Supervision, Inspection and Quarantine in recent days showed that in addition to the excessive release of formaldehyde, woodworking requirements and physical and chemical properties became closely followed by two major unqualified projects. In the sampling inspections in various places, furniture is often exposed due to unqualified physical and chemical properties. What is the physical and chemical performance? Will it affect the use of furniture? What should consumers pay attention to when purchasing?
Physical and chemical properties are hard indicators
According to the Jinghua Times reporter, physical and chemical properties are essential for wooden furniture. According to the requirements of GB/T3324-2008 "General technical conditions for wooden furniture", the physical and chemical properties of wooden furniture mainly include the physical and chemical properties of two parts of paint film and soft and hard cladding material (melamine board or fireproof board).
According to Sun Shudong, assistant director of the National Furniture and Indoor Environmental Quality Supervision and Inspection Center, according to the standard requirements, although the detection methods are different, the requirements of the two are not much different, including the liquid resistance of the paint film, heat and humidity resistance, dry heat resistance, adhesion, and resistance. Grindability, resistance to cigarette burning, etc.
In the notification from the General Administration of Quality Supervision, Inspection and Quarantine, the unqualified items of physical and chemical properties of wooden furniture are mainly liquid resistance, paint film heat and humidity resistance, paint film abrasion resistance, paint film impact resistance, and paint film resistance to cigarette burning.
Each indicator is related to life
Do not look at the terminology of liquid resistance, dry heat and so on. In fact, the physical and chemical properties of furniture are closely related to people's daily lives. "These indicators are all about what can happen in people's daily life scenes, and whether furniture will change." Sun Shudong said.
Liquid resistance mainly refers to the degree of acid and alkali resistance of the paint film. For example, if you drink carbonated drinks or soda water and sprinkle it on furniture, there will be discoloration and falling off.
The film's resistance to damp heat refers to whether it is resistant to wet and hot liquids, such as boiling water on the table, whether the paint film will fall off, discolor, and bubbling.
The dry heat of the paint film means that in the case of drying, for example, if the cup filled with hot water is placed on the table, the paint film will be burnt.
The adhesion of the paint film refers to the degree of adhesion of the paint to the wood, the substrate, the sheet or the skin. If it is bumped, it will be damaged or dropped.
The difference between cold and hot temperature is that the paint film has a low temperature and high temperature, and the paint surface has no change. Sun Shudong said that in the daily sampling inspection work, this problem was found to be less, but there were some paint films that found cracks in the colder case.
The abrasion resistance of the paint film is checked whether the surface of the paint film is easy to be scratched; the impact resistance of the paint film refers to whether it hits or bumps, and whether the paint film will fall.
The paint film is resistant to cigarette burning. It means that some people have the habit of smoking. If the cigarette butts are placed on the furniture and the table, if the cigarette is burning, see if the paint film has fallen off, bubbling or dark spots.
It can be seen that the physical and chemical properties are closely related to people's daily life and living habits, and directly related to the use of wood furniture.
Further reading: "General technical conditions for wooden furniture" GB/T3324-2008 standard wood moisture content requirements
Process is not qualified and easy to issue
Why is physical and chemical performance the second largest unqualified item for furniture? Sun Shudong said that due to the many evaluation indicators of the project, most of the reasons for the failure are caused by the manufacturer's production process.
In addition, if the materials selected by the company, such as the lacquer qualification and the quality of the foil, will affect the project. However, some manufacturers do not pay much attention to this, and there will be unqualified phenomena.
In the past two years, there have been discussions in the industry about whether the physical and chemical performance requirements of the standard are reasonable. Sun Shudong believes that the current assessment of resistance to cigarette burning projects is indeed a bit outdated, and it is understood that the standard revision may be removed. "But for soft furniture, this project is directly related to flame resistance, it is still very important." As for other indicators of physical and chemical properties, Sun Shudong believes that people's living habits are closely related, the indicator requirements are reasonable.
How do consumers check these items when they buy? According to industry experts, the physical and chemical properties are invisible to the naked eye. Unlike the woodworking requirements, they can be pushed and touched. They can only buy brand products at the hypermarket, and the quality is relatively guaranteed.
(Author: Cheng Jianlan Original title: Do not underestimate the physical and chemical properties directly affect the furniture experience)
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