Question 1: After the PUR hot-melt adhesive is emptied, it is found that there are bubbles in the adhesive after continuous use for a period of time or after a period of inactivity, which affects the uniformity of scraping. Are there any bubbles in the hot-melt adhesive?
1. Replace the sealing ring of the rubber bucket.
2. Spread enough and evenly high temperature butter.
3. Remove the rubber around the sealing ring and the remaining rubber in the pressure plate.
4. Check whether there is a gap between the cylindrical hot-melt adhesive and the inner wall of the glue barrel (may be due to thermal expansion and contraction or the filling is not dense).
5. Check whether the aluminum foil packaging bag is wrinkled to form a gap due to the pressing down of the pressure plate. If there is, the aluminum foil at the folded part of the barrel should be tightly bonded (the upper hot-pressing plate melts the glue barrel).
Question 2: After the PUR hot-melt adhesive is discharged, the particle problem occurs continuously during the use process, which affects the appearance quality. Is there any particle impurities in the hot-melt adhesive?
1. It is easy to contact moisture in the slit of the scraper head and the cavity to form rubber particles. After stopping working, use a cleaning agent that melts into a block to clean the scraper, apply high-temperature butter, and wrap it with aluminum foil after applying high-temperature butter. Before cleaning, use a cleaning solution and a feeler gauge to clean the scraper slit.
2. Due to the long-term use of the inner wall of the hose, there is carbonization and scaling of the rubber, residues of moisture curing, and carbon deposition of dust and wood chips. It is necessary to regularly use a cleaning agent to flush the hose and replace the hose and filter.
(200 mesh/inch, 0.075mm, 100 mesh/inch, 0.15mm).
3. PVC film attracts foreign dust and sawdust due to static electricity, which can be eliminated by using static electricity removal equipment.
4. The wood chips produced by high-speed friction between the veneer and the scraper are recommended to be replaced with high-quality or back-mounted veneers.
Question 3: PVC film coated wood plastic or aluminum alloy, the peel strength after 5 minutes is poor, and the glue transfer on the substrate is not much, how to solve it?
1. Increase the ambient temperature, not lower than 18 ℃.
2. Turn on the substrate preheating device and control it at 35-45℃.
3. Open the corresponding hot air cylinder to extend the opening time of the glue.
4. The surface tension of the substrate is too low, and it is necessary to replace the substrate with high surface tension (not less than 34 dynes/cm) or do primer treatment.
5. Raise the operating temperature of the scraper, hose and bucket.
6. Appropriately increase the amount of glue.
7. Properly increase the production speed.
8. Replace the product with better wettability.
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