The veneer used for the surface veneer of wooden furniture products is divided into two kinds, one is natural veneer, and the other is artificially dyed veneer. Natural veneer is a kind of natural wood with natural texture and color without artificial modification. Dyed veneer is the veneer changed by artificial dye.

So, which is better and which is worse, natural veneer and dyed veneer? How is artificial dyed wood skin processed? Let's take a look at this article with some doubt.

Among the above, both natural and dyed wood skins are available. In fact, some artificially dyed veneer, has been able to do "blue", not only inherited the natural veneer grain, but also removed some of the natural veneer defects such as insect decay. Next, first take you to take a look at the specific introduction of natural wood bark and dyed wood bark.

1. Comparison of natural veneer and dyed veneer

Natural bark

Natural wood leather and some wood decorative leather used in furniture, decoration industry is to save resources and costs. In the production of furniture or ceiling, you can directly cover a layer of decorative wood veneer directly on the thin wood, or particleboard, so that the outstanding characteristics of the product is: relatively cheap and good quality compared to solid wood board. The natural veneer process is not only relatively cheap, but also has the same appearance effect as those solid wood furniture, and the impact resistance of the surface is also very good.

Dyed bark

Dyed veneer is generally based on natural veneer, using machine processing technology to change the color of natural veneer, or repair defects and other treatment to obtain veneer; There are also some whole wood after dyeing treatment, we call it dyed wood, and the wood processed with such dyed wood is also dyed wood.

In terms of today's market, artificially dyed wood bark has the following advantages:

1. Dyed veneer has the original touch and texture of natural veneer, which is more ornamental than natural veneer after processing.

2, dyed wood veneer after processing, those natural wood original defects all disappeared, in the process of processing removed natural wood wormholes, scars and other natural defects. This is more smooth than the surface of natural wood, look more comfortable.

To sum up, the natural veneer material comes from natural, its grain can not be changed, more natural and beautiful, there is a strong three-dimensional sense, artistic sense; The dyed wood bark has the saying "from nature, better than nature", and can even restore a variety of rare wood, which can better meet the needs of different customers.

2. Dyeing method

According to the different uses of dyeing materials, there are different dyeing methods. Commonly used are veneer dyeing, solid wood dyeing and standing wood dyeing methods.

Veneer dyeing

The so-called veneer dyeing refers to the uniform dyeing of the rotary cutting or planing veneer by dipping method, and the thickness of the veneer is generally 0.2~1mm. The dyed veneer can be used as a wood-based veneer, furniture veneer and artificial artificial wood composition material.

Taking the common dyeing of mahogany veneer with acid dye as an example, the process consists of several stages: veneer decolorization → acid dye dye solution → solid color treatment → soap washing → drying.

Solid wood dyeing

Solid wood dyeing refers to the surface and interior dyeing of solid wood. In the production of solid wood process, it is necessary to dye the interior of solid wood (dyeing depth of more than 1cm). Due to the high thickness of solid wood, the stain is difficult to penetrate under conventional conditions, so it is necessary to use pressure and vacuum immersion dyeing or cooking method to treat dyeing.

In general, do not choose oleoresin-containing coniferous tree species, such as masson pine, larch, etc., and it is not appropriate to use wood filler developed tree species such as robinia, quercus, etc. If it is necessary to stain the tree species with poor wood permeability, the corresponding degreasing should be extracted to eliminate the obstacles affecting the fuel penetration.

Tree dyeing

The so-called tree dyeing refers to the method of using the SAP flow produced by SAP transpiration as a natural driving force, so that the dye liquid is dispersed to the dry matter of the tree so as to stain the wood. Using this method, not only the dyeing speed is fast, but also the dyed wood can see the dyeing state of the fine structure, and can maintain a sufficient degree of vividness.

This method utilizes the natural driving force of standing trees and saves energy. At the same time, it can realize the whole tissue dyeing of coniferous wood and broadleaf wood. Not only does it not cover up the texture of the wood itself, but also highlights the layering of the wood surface; It can give the color that the wood does not have, so it is widely used in interior decoration, handicraft materials and so on.

3. Factors affecting the dyeing effect

Among the factors that affect the dyeing effect, the first is the permeability of the wood. Wood is a kind of uneven capillary material, fuel with aqueous solution through the wood capillary channel, through the wood cell wall diffusion, settling on the surface of the fiber, so that the wood staining. The permeability of wood is closely related to wood dyeing, especially the influence on the interior of wood dyeing. In general, the higher the permeability of the wood itself, the better the permeability of its fuel inside the wood.

The permeability of China's main wood can be divided into four levels:

I. impenetrable tree species

Including coniferous wood such as larch, kefir, coarse halotaxia, etc.; Broad-leaved wood such as acacia, Sassafras, oak and so on.

Two. More difficult to penetrate tree species

Including coniferous tree species such as Chinese fir, Huashan pine, red pine and so on; Broadleaf wood such as camphor wood, color wood, yellow pineapple and so on.

Tree species that are easy to penetrate

Including coniferous wood such as camphor pine, Liaodong fir, etc.; Broad-leaved wood such as locust wood, maple birch and so on.

4. Easily permeable tree species
Including coniferous wood such as pinus tabulaeformis, red pine, pine, masson pine (sapwood), etc.; Broad-leaved wood such as ash, aspen, birch, basswood, poplar and so on.

The dyeing effect of wood is not only affected by the permeability of wood itself, but also related to the composition of dyeing solution and dyeing process parameters. Specifically, it is closely related to the moisture content of wood, tree species, chemical composition and organizational structure of wood.

1. Moisture content of wood

The ideal wood moisture content is 12%~15%;

When the moisture content of wood is 30%, the uneven phenomenon of stained wood such as stain appears;

When the moisture content is lower than 8%, the dyeing amount decreases.

2. Wood species and their organizational structure

Conifers have low density, short dyeing time and uniform dyeing.

The density of broad-leaved wood is large, the structure and texture of the morning and evening wood are different, the dyeing liquid is difficult to penetrate in the late wood part, the dyeing time is long, and the effect is poor.

The fiber structure of wood has a significant effect on the dyeing property of wood. The intercellular layer is mainly lignin, the cell wall is composed of wood cellulose and hemicellulose, and the nodular layer on the inner cavity of the cell is deposited with metabolic substances, which have different color reactions after treatment with coloring agent.

3. Temperature

The dyeing solution is in a certain temperature range, the higher the temperature, the better the dyeing effect. However, the temperature should be determined according to the use of the product, wood species, material thickness and dye varieties.

4, the color of the dye

At present, there are 13 kinds of special fuel for wood dyeing in the domestic market, including boxwood color, teak color, black walnut color, etc. In the selection of dyes dyeing, should try to use a dye corresponding to the spectrum.

According to the performance points, dyes are divided into direct dyes, acid dyes, alkaline fuels, active fuels and so on. Because acidic dyes have good permeability, light resistance and chemical properties, strong binding ability with lignin, low price, complete chromatography, and greatly improved dyeing ability of cellulose after additives, acidic dyes are currently used in wood dyeing.