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    Measures and methods for resolving veneer quality

    View:17806/05/2019  

    1, the treatment of stickers or cracks

    When the surface of the decorative surface is transparent or cracked, increase the thickness of the thin wood or cushion a layer of paper between the thin wood and the substrate, and the moisture content of the thin wood should not be too high. In addition, the hot pressing temperature and pressure are appropriately reduced. After the hot pressing, the plates are stacked facing the surface to reduce evaporation of water. Adjust the viscosity of the adhesive and the amount of glue applied, and appropriately increase the ratio of the solid content of the adhesive.


    2, the treatment of surface grease or stains and the treatment of the background

    When the surface of the decorative surface is contaminated with oil, grease or wax, it can be dissolved and dissolved by an organic solvent. The commonly used solvents are alcohol, ether, benzene and acetone. It is also possible to use a weakly alkaline 1 sodium hydroxide or sodium hydrogencarbonate. Scrub and wipe off with water. Most of the stains on the surface are contaminated with tannins, pigments and iron ions in the wood, which can be erased with hydrogen peroxide or 5 oxalic acid. When the board surface is transparent, use a slightly thicker wood or a paper of the same color as the thin wood to be applied to the substrate, and then the thin wood is attached. In addition, the substrate is colored, and then the wood method is applied to color the substrate, and the substrate is directly colored by a coating method, or a small amount of the colorant is added to the adhesive, and the coloring is performed while the glue is applied.


    3. Bubbling and degumming in a small area

    The degumming or bubbling should be deflated and then glued. Use a sharp cutter to cut the bubbling wood in the direction of the wood grain to deflate, and use a thick syringe to inject the super glue into the bubbling, and then flatten it with an iron. For slightly larger bubbling, use a sharp blade to cut the thin wood at the bubbling direction and scrape the residual glue. Select a similar thin wood to trim the desired size, and re-stick with super glue, but note that The edge of the thin wood is also cut into a bevel to ensure that the repaired thin wood is in contact with the original veneer slope, leaving no seam marks and a smooth surface.


    4, large area bubbling, degumming treatment

    When a large area of bubbling, degumming occurs, and the number of workpieces is large, only the means of repair can not solve the problem fundamentally. It is necessary to query the reasons, analyze and discuss, and find corresponding measures.


    First, the veneer material is peeled off from the surface of the substrate, and the bonding material of the bubbling material, the adhesion of the substrate and the adhesive are observed. If there is almost no adhesive left on the surface of the substrate, it means that the substrate does not match the adhesive used. It can be exchanged or modified. It can also be changed to a good quality wood-based panel, or the surface of the substrate can be sanded to make it better. The surface quality, which in turn improves the surface bond strength. If the torn veneer material is coated with a lot of substrate debris, the internal bonding strength of the substrate does not meet the strength requirements of the veneer facing material. The simplest solution is to use a substrate that meets the E1 or E0 grade. However, due to the tight construction period and the fact that the existing raw materials cannot be wasted, it is impossible to replace the adhesive or the substrate. The following is a method for solving the problem by using the existing materials.

    The process of treating the surface of the substrate: a good effect on solving the adhesion of the veneer.


    Sanding the surface of the substrate and cleaning the surface, spraying a low solid content and low viscosity (8~10s) closed primer. The substrate processing process is because the drying speed is fast, it is not suitable for thick coating, generally spray once, each time The amount of finishing is 60~90g/m2, and it should be completely dried after coating. After sanding, the amount of finishing material can be applied. The closed primer has good viscosity and permeability, and can penetrate into the deep surface of the substrate to form a film, which acts as a sealing function to prevent moisture absorption and dehydration of the substrate, and at the same time functions as a binder and a substrate to enhance the surface of the substrate. Inner bonding strength. However, it is necessary to consider the matching of the closed primer used with the adhesive and topcoat used. The "Depot" primer is very effective. In summary, spraying a closed primer is a good measure to address insufficient bond strength or loose surface in the surface of the substrate.


    5, the surface of the adhesive tape is uneven

    In severe cases, the thin wood can be shaved to trim the surface of the part. The main reason is that the thickness deviation of the substrate is large, and the thickness deviation is reduced by the original sanding, and the curve is stable, which basically satisfies the requirements of the veneer process. In addition, the surface of the plain wood-based panel has a high wax content, which will hinder the infiltration of the glue and reduce the bonding strength


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