The main factors affecting the edge sealing quality of sheet metal.

In the production process of board type furniture, edge sealing is an important processing procedure, and its edge sealing quality can directly affect the use effect of furniture. When consumers buy furniture, they can distinguish the quality of furniture from the effect of edge sealing. The plank of strict sealing edge, can let furniture look more beautiful not only, feel more smooth, the service life of furniture is longer, still can prevent effectively the formaldehyde in plank raw material release, let our life be more safe, healthy, comfortable.

One, edge sealing equipment

Welding with the skeleton first and then adding steel plates makes the machine less stable, but has the advantage of being cheap. The welded fuselage is very firm and not easily deformed, and can increase the stability of the whole fuselage. The upper and lower beam of the edge sealing machine affects the straight line operation of the processing plate to ensure the smooth process of the whole edge sealing process. The material of crossbeam has very many kinds, some can use aluminium alloy, cast iron, hard steel, among them, hard steel crossbeam is quite advanced, its each respect compares aluminium alloy and cast iron better point, the price is opposite also expensive point.

Due to the poor coordination between the engine of the edge sealing machine and the crawler, the crawler is unstable and wavy in operation, which causes stress between the edge sealing strip and the end face of the plate, resulting in uneven sealing edge, which is not conducive to trimming the equipment (the edge trimming knife with the equipment itself). Cots and belt roller is not well matched, the lack of glue or glue uneven phenomenon is very common; Trimming tools and chamfering tools are often not adjusted, not only need additional manual trimming, and trimming quality is difficult to ensure. In short, due to the poor level of equipment debugging, repair and maintenance, the quality problems caused by the most common and most lasting.

Two, plate material

As the base material of the wood-based board, the thickness deviation is generally not up to the standard, more than positive tolerance, and often exceed the tolerance allowed range (allowable tolerance range 0.1 ~ 0.2); The flatness is not up to par. This makes it difficult to grasp the distance (the thickness of the substrate) between the compressed track surface and the compressed track surface. If the distance is too small, the pressure will be too tight and the stress will increase. If the spacing is too high, the sealing strip can not guarantee the firm combination with the end of the plate.

Three, Sealing sideband material

With PVC resin, ABS resin or acrylic as the raw material extrusion molding, the main is to protect the furniture plate section, decoration, beautification of the material, it can make a piece of furniture show wood grain clear, colorful overall effect.

PVC sealing strip is a thermoplastic roll made by mixing and pressing with PVC as the main raw material, adding plasticizer, stabilizer, lubricant, dye and other additives. Its surface has wood grain, marble, cloth grain and other patterns, patterns at the same time the surface gloss is soft, with wood sense of reality and three-dimensional sense; Has certain finish and the decoration degree, has certain heat resistance, chemical resistance, corrosion resistance, the surface has certain hardness. The main function of edge banding is to seal the section of the plate, so as to avoid the damage to the plate caused by adverse factors (mainly water) in the process of use and the environment, and to prevent the formaldehyde volatiles from inside the plate, and to achieve the effect of decoration at the same time.

ABS sideband is composed of acrylonitrile, butadiene and styrene. Each monomer has different properties: acrylonitrile has high strength, thermal stability and chemical stability; Butadiene has the properties of toughness and shock resistance. Styrene is easy to process, high finish and high strength. Morphologically, ABS is an amorphous material. The polymerization of trimeric monomers results in a terpolymer with two phases, one a continuous styrene-acrylonitrile phase and the other a polybutadiene rubber dispersed phase. The characteristics of ABS mainly depend on the ratio of the three monomers and the molecular structure in the two phases. This allows great flexibility in product design and has resulted in the market for hundreds of ABS materials of different qualities. These different qualities of material provide different characteristics, such as medium to high impact resistance, from low to high finish and high temperature distortion. ABS material has super machinability, appearance characteristics, low creep, excellent dimensional stability and high impact strength.

Acrylic sealing sideband is molded by acrylic extrusion. PMMA is commonly known as plexiglass, or Acrylic (Acrylic). From this name, you may not know what kind of substance it is or what elements it is made of. The chemical name of this polymer transparent material is polymethyl methacrylate, people often say that the acrylic plate is polymethyl acrylate (PMMA) plate, it is made of methyl methacrylate monomer (MMA) polymerization. High transparency. Plexiglass is the most excellent transparent polymer material, with a transmittance of 92%, higher than glass transmittance. The tube of a solar lamp called an artificial small sun is made of quartz, which can pass through ultraviolet light completely. Ordinary glass can only pass through 0.6 per cent of uv rays, but plexiglass can pass through 73 per cent.

Four, Machining accuracy

In the process of machining, machining errors mainly come from material opening and fine cutting. Due to the equipment system error and workers' processing error, the workpiece end face cannot reach the horizontal, and cannot keep vertical with the adjacent surface. Therefore, when sealing the edge, the sealing edge strip cannot fully contact with the end face of the plate. After sealing the edge, cracks or exposed substrate appear, affecting the appearance. What is more, the substrate in the process of processing collapse, relying on sealing edge is difficult to cover.

Five, Adhesive

Edge sealing USES a special edge sealing hot melt adhesive. Due to the low temperature in winter, in order to ensure the glue and strength, the temperature of the glue should be a little higher. If it is too high, more than 190 ° c, the glue is too thin and the rubber layer becomes thin. When it is applied to the end face of the board, the temperature of the sealing strip will also be reduced, resulting in a significant decrease in the strength of the sealing edge. If the temperature drops to 170℃, the glue will be a little thicker, but the temperature of the sealing strip is lower, and the glue and strength are not enough. If the temperature is too low, the glue will not melt well. In production, this contradiction is very prominent and difficult to solve. In addition, the adhesive quality of the adhesive itself and the adaptability and affinity between the substrate and the edge sealing strip all affect the edge sealing quality.