What is the PVC edge banding?
PVC edge banding is one kind of thermoplasticity coiled material made by the polyvinyl chloride in the way of calender by mixing up with the auxiliary, such as the plasticizer, stabilizer, lubricant, and the dye.
The PVC edge banding is always used with furniture contact paper, to decorate a better overall effect of furniture. In the furniture decoration market, the wood grain furniture paper is one of the popular contact paper, so the popular PCV edge banding is wood grain edge banding too, especial for maple edge banding and walnut edge banding.
The advantages of the PVC edge banding
1、Soft surface, although the surface was printed the wood、marble and the cloth texture on the surface, it still could keep the surface soft.
2、Having the realism and the third-dimension as the real wood.
3、Having a certain degree of the cleanliness feature and the decorative feature.
4、Having certain degree of heat resistance, chemical resistance, and corrosion resistance.
5、Having certain degree of solidity on the surface.
The main function of the edge banding.
1、Banding the panel section to avoid the damage caused by some negative elements in the environment and the using process (pay more attention for the water).
2、Avoid the volatilization of the formaldehyde hiding in the panel to achieve the function of decorative feature.
About the calcium carbonate powder (usually be called lime powder)
Generally, there is some calcium carbonate in the PVC edge banding. And the content of the calcium carbonate powder should be kept in an appropriate quantity. If it too high which will make the structure of the PVC loose and affect the quality of the PVC edge banding heavily, causing a lot of problem, such as
1、Crease in white.
It means that the edge banding is flexed in arc-shaped which will caused the white crease. Once the white crease caused and it will not disappear, even through the edge banding is straightened again.
It means that handling the detail about the edge banding will cause a gap, producing the edge curl. There is no doubt that edge curl also caused by other situation, take a example, the different of the speed and the order of adding the hot melt adhesive and raw material will not make the edge banding attaching on the panel tightly which lead to the edge curl appearing。
3、Poor appearance with the dim glossiness
After the edge banding is cut in detail and polished. The glossiness of is will become dim and fuzzy, leading to the appearance poor. At the present market, a lot of manufactures will add more calcium carbonate powder. Sometimes the content of the calcium carbonate powder will even over 60%. And the reason for why dose the different type of edge banding with the same brand sell in different price, the key reason is the content of the calcium carbonate powder.
Due to the high content of calcium carbonate, the edge band has no toughness, and the internal structure will be loose. If it is affected by external force slightly, it will crack, especially in the transportation with low temperature.
5、The problems in surface printing
There are two technologies for surface printing: printing and heat transfer film. The surface of heat transfer film is glossy, and the product looks bright and layered. Then due to its high cost, slow transfer speed and inconvenient color assortment with the panel, it has been replaced by printing. However, some low quality PVC edge banding is added in excess calcium carbonate powder, which makes the problem about discoloration, whatever which printing technology we choose, the discoloration still can not be handled，so the technology of heat transfer film also be choose some time.