How to distinguish the quality of PUR hot melt adhesive?
I believe everyone is very concerned about how to distinguish the quality of PUR hot melt adhesive. Below, I will teach you from several aspects to identify the quality of PUR hot melt adhesive. 1. You can use the same piece of paper and use different machine speeds to test glue. Through this test method, you can judge the bonding effect and pulling force of this hot melt adhesive. 2. In the same machine, at the same machine speed, use different papers to test the bonding effect and tension of this hot melt adhesive.
I believe everyone is very concerned about how to distinguishPUR hot melt adhesiveThe good or bad. Below, I will teach you from several aspects to identify the quality of PUR hot melt adhesive.
1. You can use the same piece of paper and use different machine speeds to test glue. Through this test method, you can judge the bonding effect and pulling force of this hot melt adhesive.
2. In the same machine, at the same machine speed, use different papers to test the bonding effect and tension of this hot melt adhesive.
3. Put the bonded paper in the refrigerator, freeze for about 1-3 hours, take out the paper at different times, separate it from the middle of the adhesive, observe whether the paper is broken or fragile, and judge the weather resistance of the glue.
4. Of course, for the hot melt adhesive itself, it is necessary to observe whether there are impurities, bubbles and the thickness of the glue when heating, so as to judge the quality of the glue.
PUR hot melt adhesive storage temperature: 8~28 ℃. Store in a dry and dark place to avoid excessive air humidity. Do not use damaged products.
Using PUR hot melt adhesiveBefore:
1) First check whether the vacuum state of the glue packaging is good, if there is any leakage, please stop using it;
2) The glue needs to return to room temperature for several hours (depending on the storage temperature);
3) The glue should be preheated, do not tear off the aluminum foil (label) (usually 5 to 15 minutes), or put the packaged glue in the oven to preheat. It is recommended to control the temperature at 100 ℃;
4) After taking out the PUR glue from the preheating cylinder, the scarring on the top and tail of the hose must be removed before the glue can be used;
5) All workpieces should be cleaned with IPA, and the surface of the workpiece should be dry without obvious signs of oil or dust contamination.
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