During this period of time in the process of network marketing, a lot of customers asked some questions about edge-sealing, today I have time to sort them out for your reference.

Edge Band Problem

First, why are there such problems as whitening, skipping, cracking and poor glossiness of the edge of the PVC seals in the use process?

Answer: These questions mainly depend on the content of calcium carbonate powder (commonly known as lime powder) in the sealing strip. Generally, PVC seals contain calcium carbonate powder, but the high content of calcium carbonate powder will make the structure of PVC loose, which seriously affects the quality of PVC seals. The problems caused by the high content of calcium carbonate powder are as follows:

1) Bleaching, that is, after the edge of the sealing strip is curved in a small arc, there will be a whitening phenomenon in the bending part, and this whitening will not be restored after the edge of the sealing strip is stretched again. This phenomenon is more evident for dark edge seals.

2) Bumper is easy to produce when the edge is trimmed. Of course, the cause of jumping is not only the high content of calcium carbonate powder. When the speed of hot melt glue and feeding is not well coordinated, the edge-sealing strip is not fully adhered to the plate when trimming, so the phenomenon of edge-jumping is easy to occur due to the floating of the edge-sealing strip.

3) The edge glossiness of trimming and grinding edges is poor, so the appearance effect will be poor. At present, in order to reduce the cost, the poor quality edge seals in the market contain more than 60% calcium carbonate powder. As for the different equivalent products of the same brand, their calcium carbonate content is also the main factor.

4) Cracking, because the content of calcium carbonate is too high, the sealing edge is not tough, the internal structure is loose, slightly subjected to external force will crack, especially in the transport of low temperature.

Edge Band

2. What is backing glue? Can the seals with backing glue be glued directly to the board?

Answer: Back glue (bridge-erecting agent) PVC can not be bonded directly to the board very well. The quality of back glue (actually not glue, but play the role of intermediate bridge, so it is also called bridge-erecting agent) directly affects the bonding effect. Especially when the weather is cold, the workshop temperature is relatively low, the efficiency of hot melt glue and backing glue is greatly reduced, which is often attributed to the quality of edge seals by furniture manufacturers. A good way is to replace the high temperature hot melt adhesive with high viscosity and purity, increase the working temperature of the hot melt adhesive, raise the room temperature and preheat the edge sealing strip (quality must be guaranteed).

Edge Band

3. Why does the "flat" edge bar need radian?

Answer: When the curvature of the edge-sealing strip itself is bonded and extruded, in order to prevent the loss of glue, a good edge-sealing strip should have a little inward bend in its width direction. The poor quality edge-sealing strip is flat or even anti-warping, so it is easy to produce poor bonding.

Edge Band

4. What is the material of 3D edge bar?

Answer: At present, only a few of the 3D seals on the market are acrylic products (the ingredients are acrylic and some additives, the acrylic ratio is about 98%), while the others are transparent PVC. The problem with transparent PVC is that after trimming and grinding, the transparency of its edges will be slightly worse, so that the effect of 3D can not be completely achieved.

3D Edge Band

5. What should we pay attention to when choosing PVC seals?

Answer: There are two kinds of processes for printing pattern PVC surface on PVC surface: printing and heat transfer film. The surface of heat transfer film is glossy, and the product looks bright and layered. However, it has been replaced by printing because of its high cost, slow transfer speed and inconvenient color matching plate.  The content of calcium carbonate in some inferior PVC seals is too high. For example, the printing process will cause discoloration, so sometimes the heat transfer film process will be used.

Notices for choosing and purchasing PVC seals:

A: Smooth surface, no bubbles, no stretch, moderate gloss.

B: The surface and back are flat, uniform in thickness and uniform in width.

C: Reasonable hardness, higher elasticity, better quality and stronger wear resistance.

D: The nearer the side color and surface color of the trimmed back edge sealing strip is, the better it will be, the less clear it will be, and the better its gloss will be. Otherwise, the material used for the trimmed edge sealing strip will be too low, which will lead to the incongruity of the overall color of the finished furniture.

E: The back treatment agent is uniformly coated. In general, transparent and white treatment agent is better. If the back treatment is improper, the bond strength after edge sealing will be low or even not.

F: The color of each batch must be the same. The smaller the color difference between different batches, the better the quality.

G: Trimming and cutting is not brittle, no gap.

H: Transparent sealing glue (adhesive paper used for sealing cartons) is pasted on the sealing edge, rubbed back and forth several times with your finger at the position where the sealing glue is pasted, and then pulled up to check whether the sealing edge band is decolorized.