False bonding is a phenomenon that our corrugators will encounter when they enter the production of cartons. The following will briefly analyze the reasons and solutions for false bonding of corrugators.
Cause Analysis:
a, lining and corrugated false bonding
1. The viscosity of the adhesive is not enough; 2. The amount of glue applied is too small; 3. The adhesive is deteriorated; 4. The machine speed of the corrugating machine is too fast; 5. The machine speed of the corrugating machine is too slow; 7. The middle part of the corrugating roller is worn out, resulting in insufficient pressure on the pressure roller; 8. The moisture content of the paper is too high; 9. The temperature of the corrugating machine is too low; 10. The tension of the paper is too large.
Ways to improve:
1) Insufficient adhesive viscosity: 60-90 seconds in winter, 90-120 seconds in summer;
2) The amount of glue applied is 1/3 of the width of the corrugated top, that is, A corrugation is 1.2 mm, and B and C corrugation is 1 mm;
3) After the adhesive is blended, the storage time is 48 hours in summer and one week in winter;
4) The temperature of the corrugating roll is 150-170 degree , and the machine speed is controlled at 70m/min;
5) The temperature of the corrugating roll is 150-170 degree , and the machine speed cannot be lower than 25 m/min;
6) Adjust the cylinder pressure to 0.4-0.6Mpa;
7) Calculate whether the running meters completed by the production volume of corrugated rollers have reached or exceeded;
8) Paper standard moisture content: A grade 8-12 percent ; B grade 7-12 percent ; C grade 8-13 percent ;
9) The temperature of the corrugating roller shall not be lower than 120 degree . The measuring point of Infrared is the contact point between the corrugated and the base paper; 10) Adjust and ensure that the tension of the paper is adapted to the state.
b, surface and corrugated false bonding
1) The paper tension is too large; 2) The gap between the rubber rollers of the secondary gluing machine is too large; 3) The gap between the two sides of the rubber rollers of the secondary gluing machine is uneven.